Quantum numbers are a set of four numbers used to describe the quantum state of an electron in an atom. These numbers specify the energy, orbital shape, orientation, and spin of the electron.
What is Energy Sublevels?
Energy sublevels, also known as subshells, are regions within an energy level where electrons are likely to be found. Each energy sublevel is characterized by a unique shape and orientation in space, and can contain a specific number of electrons.
The energy sublevels within an energy level are arranged in order of increasing energy, with the s sublevel being the lowest in energy and the f sublevel being the highest in energy. The number and arrangement of electrons in an atom's energy sublevels determine its electronic configuration and its chemical and physical properties.
a. When n = 1, there is only one energy level and it contains one s orbital.
b. The 3p sublevel corresponds to the third energy level (n=3) and consists of three p orbitals. The p orbitals are oriented along the x, y, and z axes and can hold a total of 6 electrons (2 electrons per orbital). Therefore, the 3p sublevel contains three p orbitals.
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2 LiOH + CO2 > Li2CO3 + H2O
How many milliliters H20(density = .997 g/mL could form from 29.3g LiOH
Answer:
We can use stoichiometry to determine the amount of water produced when 29.3 g of LiOH reacts with CO2.
First, we need to convert 29.3 g of LiOH to moles:
moles of LiOH = mass/molar mass = 29.3 g / (6.941 g/mol + 15.999 g/mol + 1.008 g/mol) = 0.5 mol
From the balanced chemical equation, we see that 2 moles of LiOH react with 1 mole of CO2 to produce 1 mole of H2O. Therefore, we can say:
0.5 mol LiOH × (1 mol H2O / 2 mol LiOH) = 0.25 mol H2O
Now, we can use the molar mass of water to convert moles to grams:
mass of H2O = moles × molar mass = 0.25 mol × 18.015 g/mol = 4.504 g
Finally, we can use the density of water to convert grams to milliliters:
volume of H2O = mass / density = 4.504 g / 0.997 g/mL = 4.52 mL
Therefore, approximately 4.52 mL of water could form from 29.3 g of LiOH.
How do chemists use Avogrado’s number to connect moles and atomic particles?
The molar quantity must be multiplied by Avogadro's number to be converted to moles or atoms.
How can a scientist use Avogadro's number?
One of the basic constants in chemistry is Avogadro's number. When the same amount of atoms or molecules are being compared, it allows comparison of the various atoms or molecules of a given substance.
A material's mole is equivalent to 6.022 x 10²³of that substance (such as atoms, molecules, or ions). The term "Avogadro's number" or "Avogadro's constant" refers to the integer 6.022*10²³. The mole idea can be used to convert between particle mass and number.
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The empirical formula for the artificial sweetener aspartame is C14H18N205. What is the mass percentage of carbon in aspartame.
57.14% is the mass percentage of carbon in aspartame.
Define empirical formula.
An empirical formula is a compound's chemical formula that only specifies the ratios of the elements it contains and not the precise quantity or arrangement of atoms. This would be the compound's ingredient with the lowest whole number ratio.
Typically, the empirical formula is used to merely display the components of a structure. When one wishes to quickly identify the elements they are working with, this is helpful. When you want to know how many atoms of each element are present in the substance, the molecular formula is the most helpful.
The mass percentage of carbon is 14*12/(14*12 + 18*1 + 2*14 + 5*16) i.e. 57.14%
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Thankssssssss
The total number of moles of ammonia produced when 10 moles of hydrogen reacts with a mole of nitrogen would be = 6.7 moles of ammonia.
How to calculate the calculate the total number of moles of ammonia?From the balanced chemical equation given above, 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia.
This means that;
3 moles of Hydrogen = 2 moles of ammonia
10 moles of hydrogen = X moles of ammonia
Make X the subject of formula;
X = 10×2/3
= 20/3
= 6.7 moles of ammonia.
Therefore when 10 mole of hydrogen reacts with nitrogen, 6.7 mole of ammonia will be produced.
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Why do carbon, silicon, and germanium share many chemical properties?
o They have the same atomic mass.
o They have the same atomic number.
o They have the same ratio of electrons to protons.
o They have the same electron configuration.
Answer:
Carbon, silicon, and germanium share many chemical properties because they belong to the same group in the periodic table, which is group 14 (also known as the carbon group). The elements in this group have the same number of valence electrons (4), which gives them similar chemical properties.
The correct option is: They have the same number of valence electrons (4), which gives them similar chemical properties.
Explanation:
Household bleach contains 5.25% (m/v) of sodium hypochlorite. It is often recommended that you dilute the household bleach to 0.110% (m/v) before using. If you need 1.00 gallons of diluted bleach, how many cups of household bleach should you measure?
Answer:
First, we need to calculate how much sodium hypochlorite is in 1 gallon of 0.110% bleach solution:
0.110% (m/v) = 0.110 g/100 mL
1 gallon = 3,785 mL
So, the mass of sodium hypochlorite in 1 gallon of 0.110% bleach solution is:
0.110 g/100 mL x 3,785 mL = 4.1635 g
Now we can use this information to calculate how much undiluted household bleach we need:
5.25% (m/v) = 5.25 g/100 mL
Let's call the volume of undiluted bleach we need "V".
We can set up a proportion:
5.25 g/100 mL = 4.1635 g/3785 mL
Solving for V:
5.25 g/100 mL = x/3785 mL
x = 199.0425 g
Finally, we need to convert grams to cups. The density of household bleach is about 1.08 g/mL, so:
199.0425 g ÷ 1.08 g/mL = 184.31 mL
There are 48 teaspoons in a cup, and 5 mL in a teaspoon, so:
184.31 mL ÷ 5 mL/teaspoon ÷ 48 teaspoons/cup ≈ 0.77 cups
Therefore, you should measure approximately 0.77 cups of household bleach to make 1.00 gallon of diluted bleach solution.
ANSWER ALL THE FOLLOWING
A. Cr2O3 (Chromium (III) Oxide); Stock Name: Chromic Oxide b. (NH4)3PO4 (Ammonium Phosphate); Stock Name: Ammonium Phosphate c. CaSO4 (Calcium Sulfate); Stock Name: Gypsum.
What is Gypsum ?
Gypsum is a soft, white, mineral composed of calcium sulfate dehydrate. It is typically found in the form of sedimentary rock and is an important component of soil. Gypsum can be used in a variety of industrial and commercial applications. It is often used in the production of plaster and drywall, as well as in cement and concrete.
II. a. Iron(II) Chloride
b. Barium Hydroxide
c. Lithium Cyanide
d. Lead(II) Chloride
The correct pairing is d. P4Q10: tetraphosphorus decoxide. Phosphorus can form up to four single bonds with oxygen, so the correct compound name would be tetraphosphorus decoxide.
IV.a. C2H2
b. C2H4
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Multiplying each value by two gives
the ratio below. What is the empirical
formula for the compound?
20
5 C 8 H
:
2
1) C₂.5H4O 2) C5H8O₂
3) C5H4O 4) C5H4O2
Enter the answer choice number.
The chemical formula of a combination that provides the quantities (ratios) of the elements contained in the complex but not the actual numbers or order of atoms is known as an empirical formula. This would be the elemental compound's lowest whole integer percentage.
What is an empirical formula in chemistry?The empirical formula of a chemical substance in chemistry is the simplest whole number quantity of atoms contained in the product. [1] As an illustration, the empirical formula of sulfur monoxide, or SO, is merely SO, as is the empirical formula of disulfur dioxide, S2O2.
Thus, sulfur monoxide and disulfur dioxide, both sulfur and oxygen molecules, have the same empirical formula. Their molecular formulas, which describe the amount of atoms in each molecule of a chemical substance, are, however, not identical.
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Answer:
2
Explanation:
Cuantos moles hay en 158 gramos de oro
There are 0.802 moles of gold present in 158 grams of gold.
What is meant by molar mass?Mass in grams of one mole of the compound is known as the molar mass of substance. It is the mass divided by amount-of-substance measured in moles. Molar mass of a compound can be found out by adding standard atomic masses of constituent atoms.
molar mass of gold : 196.967 g/mol.
To find the number of moles of gold in 158 grams, we use the following formula:
moles = mass / molar mass
moles = 158 g / 196.967 g/mol
moles = 0.802 mol
Therefore, there are 0.802 moles of gold in 158 grams of gold.
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Note: The question given on the Portal is incomplete. Here is the correct question.
Question: How many moles are in 158 grams of gold?
if 54.9g of aluminum hydroxide, al(oh)3, is neutralized with 91.9g of sulfuric acid, h2so4. how many grams of al₂(so₄)₃ will be produced
Answer:
120.2 g of aluminum sulfate will be produced
Explanation:
The balanced chemical equation for the reaction between aluminum hydroxide and sulfuric acid is:
2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O
According to the equation, it takes 2 moles of aluminum hydroxide to react with 3 moles of sulfuric acid to produce 1 mole of aluminum sulfate.
To find out how many grams of aluminum sulfate will be produced, we first need to calculate the number of moles of each reactant.
The molar mass of aluminum hydroxide (Al(OH)3) is:
Al = 26.98 g/mol
O = 15.99 g/mol (3 atoms)
H = 1.01 g/mol (9 atoms)
Total = 78.00 g/mol
Therefore, 54.9 g of aluminum hydroxide is equal to 54.9 g / 78.00 g/mol = 0.7038 moles of aluminum hydroxide.
The molar mass of sulfuric acid (H2SO4) is:
H = 1.01 g/mol (2 atoms)
S = 32.07 g/mol
O = 15.99 g/mol (4 atoms)
Total = 98.08 g/mol
Therefore, 91.9 g of sulfuric acid is equal to 91.9 g / 98.08 g/mol = 0.9361 moles of sulfuric acid.
Since 2 moles of aluminum hydroxide react with 3 moles of sulfuric acid to produce 1 mole of aluminum sulfate, the limiting reactant in this case is aluminum hydroxide, as it is present in the smaller amount.
The number of moles of aluminum sulfate produced can be calculated as:
0.7038 moles Al(OH)3 × (1 mole Al2(SO4)3 / 2 moles Al(OH)3) = 0.3519 moles Al2(SO4)3
The molar mass of aluminum sulfate (Al2(SO4)3) is:
Al = 26.98 g/mol (2 atoms)
S = 32.07 g/mol (3 atoms)
O = 15.99 g/mol (12 atoms)
Total = 342.15 g/mol
Therefore, the mass of aluminum sulfate produced is:
0.3519 moles Al2(SO4)3 × 342.15 g/mol = 120.2 g
Therefore, 120.2 g of aluminum sulfate will be produced.
according to the theory of plate tectonics which is one feature that plates carry
According to the theory of plate tectonics, plates carry both the oceanic and continental crusts of the Earth's lithosphere.
The lithosphere is the rigid outermost layer of the Earth, which is broken into several large plates that move relative to one another over time.
What is plate tectonics theory?
The plate tectonics theory is a scientific model that explains the movement and behavior of the Earth's lithosphere, which is the rigid outermost layer of the planet. According to this theory, the lithosphere is divided into several large plates that move and interact with one another over time.
The driving force behind plate movement is the convection currents in the mantle layer beneath the lithosphere. As these currents move, they drag the plates along with them, causing them to collide, slide past one another, or move apart. These interactions can cause geological events such as earthquakes, volcanic eruptions, and the formation of new landmasses.
The plate tectonics theory has provided a framework for understanding many of the geological features of the Earth's surface, including the distribution of mountain ranges, the formation of ocean basins, and the occurrence of earthquakes and volcanic activity. The theory has also helped explain the distribution of plant and animal species, as well as the historical movements of the continents over geological time.
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Answer: a. seafloor
Explanation:
Give a description of each of the five chemical reactions from the point of view of different classifications and arrange the coefficients
1. The reaction between the reactants potassium iodide and lead nitrate, which results in potassium nitrate and lead iodide. It is hence a double decomposition reaction.
Types2. The reaction between magnesium (Mg) and titanium tetrachloride (TiCl4) produces titanium (Ti) and magnesium chloride (MgCl2). It is a displacement reaction because titanium in titanium chloride is displaced by the more active magnesium.
3. The reaction between CO2 and H2O is an illustration of an addition reaction, or more specifically, a nucleophilic addition reaction. Thus, the hydrogen ion from the water molecule serves as the nucleophile.
4. The production of salt, which is copper chloride and water, as a result of the reaction between copper oxide and hydrochloric acid is an example of neutralization.
HCl and Copper Oxide together produce a Neutralization reaction.
5. A decomposition reaction takes place when a single reactant splits into two or more products. The all-inclusive formula AB A + B can be used to represent this. Hydrogen peroxide and water being broken down into hydrogen and oxygen are two examples of decomposition reactions.
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Help me!
“When nucleotides are changed in the DNA what happens to the codons in mRNA, and what effects result during protein synthesis?”
Answer:
the ribosome will read the mRNA sequence differently
Explanation:
The change can cause the amino acid to be produced
An air/gasoline vapor mix in an automobile cylinder has an initial temperature of 173 ∘C and a volume of 12.4 cm3 . If the mixture is heated to 567 ∘C with the pressure and amount held constant, what will be the final volume of the gas in cubic centimeters?
Answer:
Explanation:
We can solve this problem using the combined gas law:
(P1V1) / T1 = (P2V2) / T2
where P is the pressure, V is the volume, and T is the temperature, measured in kelvins (K). The amount of gas is assumed to be constant.
We need to convert the initial and final temperatures to kelvins by adding 273.15 to each temperature:
T1 = 173 + 273.15 = 446.15 K
T2 = 567 + 273.15 = 840.15 K
Substituting the given values into the equation and solving for V2, we get:
(1V1) / T1 = (1V2) / T2
V2 = (T2/T1) * V1
V2 = (840.15/446.15) * 12.4 cm3
V2 = 23.3 cm3 (rounded to one decimal place)
Therefore, the final volume of the gas will be 23.3 cubic centimeters.
What is the role of grasses in the food web above
The food web in the image you provided includes a variety of organisms such as producers, consumers, and decomposers. Grasses play an important role in this food web as they are a primary producer.
What is the process by which grasses and other plants convert sunlight into energy in the food chain?
Grasses, like other plants, use photosynthesis to convert sunlight into energy, which they use to grow and produce organic compounds such as sugars and starches. These compounds form the basis of the food chain, providing energy and nutrients for herbivores such as insects, rodents, and large mammals like deer and bison.
In turn, these herbivores are consumed by predators such as snakes, hawks, and wolves, which are then decomposed by scavengers and decomposers such as bacteria and fungi. These decomposers break down the remains of dead organisms and return nutrients to the soil, where they can be taken up by plants like grasses to start the cycle anew.
Therefore, grasses are a critical component of the food web, serving as the foundation for energy flow and supporting the survival of many different species in the ecosystem.
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The diagram below shows a gas with an initial pressure of 3060 mm Hg in a cylinder constant temperature. The gas expands inside the cylinder and pushes the piston
the final pressure of the gas inside the cylinder is 784 mm Hg.
What is Boyle's law?
To solve this problem, we can use Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume at constant temperature. Mathematically, this can be written as:
P1V1 = P2V2
where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.
Substituting the given values into the equation, we get:
3060 mm Hg x 0.520 L = P2 x 2.03 L
P2 = (3060 mm Hg x 0.520 L) / 2.03 L
P2 = 784 mm Hg
Therefore, the final pressure of the gas inside the cylinder is 784 mm Hg.
The answer is (B) 784 mm Hg.
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How many grams of NaOH reacted
3.49 grams of NaOH reacted in this precipitation reaction.
How to find the amount of NaOHFrom the balanced chemical equation
1 mole of Fe(NO3)3 reacts with 3 moles of NaOH to produce 1 mole of Fe(OH)3 and 3 moles of NaNO3.
We can start by calculating the number of moles of Fe(OH)3 produced:
molar mass of Fe(OH)3
= 55.85 g/mol + 3(16.00 g/mol + 1.01 g/mol)
= 106.88 g/mol
moles of Fe(OH)3 = 28.0 g / 106.88 g/mol = 0.262 moles
According to the stoichiometry of the balanced equation,
1 mole of Fe(OH)3 is produced by reacting with 3 moles of NaOH. Therefore, the number of moles of NaOH used in the reaction is:
moles of NaOH = 0.262 moles / 3 = 0.0873 moles
Convert the number of moles to grams:
molar mass of NaOH
= 22.99 g/mol + 16.00 g/mol + 1.01 g/mol
= 40.00 g/mol
grams of NaOH
= moles of NaOH x molar mass of NaOH
= 0.0873 moles x 40.00 g/mol
= 3.49 g
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Light is emitted by atoms that have been excited by
which of the following?
Question 3Describe the energy in nuclear fuel and the way in witch it’s converted to electrical energy
The energy in nuclear fuel comes from the fission (splitting) or fusion (merging) of atomic nuclei. When the nucleus of an atom is split or merged, a large amount of energy is released in the form of heat and radiation. This energy is known as nuclear energy, and it is one of the most concentrated forms of energy known to us.
To convert nuclear energy into electrical energy, we typically use a nuclear reactor, which is a device that uses controlled nuclear reactions to generate heat. The heat is then used to produce steam, which drives a turbine connected to a generator. The generator converts the mechanical energy of the turbine into electrical energy, which can be distributed to homes and businesses through a power grid.
In more detail, the nuclear reactor contains fuel rods that are made of a radioactive material, such as uranium-235 or plutonium-239. When a neutron strikes the nucleus of one of these atoms, it causes the nucleus to split into two smaller nuclei, along with the release of additional neutrons and a large amount of heat. This process is known as nuclear fission, and it is sustained in the reactor by controlling the rate of neutron production and absorption.
The heat produced by nuclear fission is transferred to a coolant, such as water or gas, which carries the heat to a heat exchanger. In the heat ex
A reaction has a rate constant of 0.012s ^ - 1 at 400.0 K and 0.691s ^ - 1 at 450.0 K.
Determine the activation barrier for the reaction.
Answer:
The rate constant of a reaction is related to the activation energy (Ea) and the temperature (T) by the Arrhenius equation:
k = A * e^(-Ea/RT)
where k is the rate constant, A is the pre-exponential factor, R is the gas constant, and T is the absolute temperature.
Taking the natural logarithm of both sides of the equation, we get:
ln(k) = ln(A) - (Ea/RT)
We can use this equation to determine the activation energy for the reaction by comparing the rate constants at two different temperatures. For example, at 400.0 K and 450.0 K, we have:
ln(k1) = ln(A) - (Ea/RT1)
ln(k2) = ln(A) - (Ea/RT2)
where k1 is the rate constant at 400.0 K, k2 is the rate constant at 450.0 K, and RT1 and RT2 are the product of the gas constant and temperature at each temperature.
Taking the difference between the two equations, we get:
ln(k2/k1) = Ea/R * (1/RT1 - 1/RT2)
Solving for the activation energy (Ea), we get:
Ea = -R * ln(k2/k1) / (1/RT1 - 1/RT2)
Substituting the given values, we get:
Ea = -8.314 J/mol*K * ln(0.691/0.012) / (1/400.0 K - 1/450.0 K)
Ea = 93.8 kJ/mol
Therefore, the activation energy for the reaction is 93.8 kJ/mol.
Mg(s)+2HCl(aq)=MgCl2(aq)+H2(g)
How many g of Magnesium metal are required to obtain 2.6L of hydrogen gas?
The answer is 21.5 L ,So, start with the balanced chemical equation for the decomposition of hydrochloric acid.
What is hydrochloric used for?An liquid solution of hydrogen chloride is what is known as hydrochloric acid, also referred to as muriatic acid. It has an unmistakably strong odour and is translucent. It is categorised as a powerful acid. In the digestive processes of the majority of mammal species, including humans, it is a part of the gastric acid. A crucial commercial substance and reagent for laboratories is hydrochloric acid.
Chemical burns from hydrochloric acid can be extremely painful if they come into touch with skin or other organs. Ingestion of hydrochloric acid can result in blindness. The concentration of the acid and how long it remains in touch with the organs determine how severe the burns are.
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A sample of neon has a pressure of 56 atm at 29.5 celcius. at what temp in kelvin would the gas exert 75 atm of pressure on the container
Explanation:
Refer to pic..........
Calculate the number of moles and the mass of the solute in each of the following solutions:
(a) 2.00 L of 18.5 M H2SO4, concentrated sulfuric acid
(b) 100.0 mL of 3.8 X 10^-6 M NaCN, the minimum letal concentration of sodium cyanide in blood serum.
a) 2.00 L of 18.5 M H2SO4, concentrated sulfuric acid
What is sulfuric acid?
Sulfuric acid is a strong mineral acid commonly used in industrial settings for a variety of purposes. It is a colorless, odorless, oily liquid that is highly corrosive and reacts violently with many organic and inorganic materials.
Number of moles = Molarity x Volume
= 18.5 M x 2.00 L
= 37.0 moles
Mass of the solute = Number of moles x Molar Mass
= 37.0 moles x 98 g/mol
= 3,646 g
b) 100.0 mL of 3.8 X 10^-6 M NaCN, the minimum letal concentration of sodium cyanide in blood serum.
Number of moles = Molarity x Volume
= 3.8 x 10^-6 M x 0.100 L
= 3.8 x 10^-8 moles
Mass of the solute = Number of moles x Molar Mass
= 3.8 x 10^-8 moles x 49 g/mol
= 1.86 x 10^-7 g
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Calculate the number of moles in 80.0 g of phosphorus
There are 2.586 moles of phosphorus in 80.0 g of phosphorus.
This number is known as Avogadro's number, which is approximately 6.022 x 10^23.
What is Moles?
Moles are a unit of measurement used in chemistry to express the amount of a substance. One mole of a substance is the volume of that substance that has the same number of atoms as there are in 12 grammes of pure carbon-12. Other terms for moles include molecules and ions.This number is known as Avogadro's number, which is approximately 6.022 x 10^23.
To calculate the number of moles in 80.0 g of phosphorus, we need to divide the mass of phosphorus by its molar mass. The molar mass of phosphorus is 30.97 g/mol.
Number of moles of phosphorus = 80.0 g / 30.97 g/mol
Number of moles of phosphorus = 2.586 moles
Therefore, there are 2.586 moles of phosphorus in 80.0 g of phosphorus.
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Ascorbic acid (vitamin C) contains 40.92 % % carbon, 4.58% % hydrogen, and 54.50% % oxygen by mass. Assume a 100-gg sample of ascorbic acid. How many moles of carbon, hydrogen, and oxygen are present in a 100-gg sample of ascorbic acid? Enter the number of moles of carbon, hydrogen, and
oxygen numerically, separated by commas.
Answer:
In 100 g of ascorbic acid, we will have 40.92 g C, 4.58 g H, and 54.50 g O. The whole-number ratio gives us the subscripts for the empirical formula. Thus, the empirical formula is C3H4O3.
Explanation:
Answer: Hope this helps
Explanation:
10
Select the correct answer.
Which property of a substance can be determined using a pH indicator?
OA. acidity
OB. boiling point
O C. density
OD. electrical conductivity
OE
Which property of a substance can be determined using a pH indicator
Answer: (A) acidity
Explanation: Acidity is a measure of how acidic a substance is. pH is a system used to measure the H+ ion concentration in a substance. Using the equation -log([H+]=pH, if given a pH value less than 7, a substance is acidic, and greater than 7 indicates basicity.
Common indicators are phenolphthalein and bromthymol blue which turn different colors depending on the acidity of the solution they're in. This color tells us nothing about the boiling point, density, or electrical conductivity.
Hope this helps!
Which of the following substances is insoluble in water, according to these solubility rules?
A) Sodium chloride (NaCl)
B) Calcium hydroxide (Ca(OH)2)
C) Potassium nitrate (KNO3)
D) Silver chloride (AgCl)
Which of the following ions is soluble in water when paired with according to the solubility rules chart?
C) Chloride (Cl-)
B) Sulfate
D) Hydroxide (OH-)
A) Carbonate
Question 12 (1.25 points)
Which of the following combinations will result in a precipitate, according to solubility rules?
A) Sodium nitrate (Na2CrO4) and barium chloride (BaCl2)
B) Ammonium chloride (NH4Cl) and sodium hydroxide (NaOH)
C) Calcium sulfate (CaSO4) and sodium carbonate (Na2CO3)
D) Potassium iodide (KI) and silver nitrate (AgNO3)
Question 13 (1.25 points)
Which of the following statements is true about dilute and concentrated solutions?
A) Dilute solutions have a higher solvent-to-solute ratio than concentrated solutions.
B) Concentrated solutions contain more solute than dilute solutions.
C) Dilute solutions contain more solute than concentrated solutions.
D) Concentrated solutions have a higher solvent-to-solute ratio than dilute solutions.
Question 14 (1.25 points)
What volume of a 0.500 M sodium chloride solution is required to make 500. mL of a 0.100 M sodium chloride solution?
A) 100 L
B) 0.100 ml
C) 0.100 L
D) 1 L
Question 15 (1.25 points)
A student has a 0.500 M solution of hydrochloric acid (HCl) that is too concentrated for an experiment. The student needs to dilute the solution to 0.100 M. If the student needs 250 mL of the diluted solution, how much of the original solution should be used?
A) 250 ml
B) 50.0 ml
C) 125 ml
D) 500 ml
Answer:
Question 10: Which substance is insoluble in water?
Answer: Silver chloride (AgCl).
Question 11: Which ion is soluble in water?
Answer: Chloride (Cl-).
Question 12: Which combination will form a precipitate (solid) according to solubility rules?
Answer: Calcium sulfate (CaSO4) and sodium carbonate (Na2CO3).
Question 13: Which statement is true about dilute and concentrated solutions?
Answer: Concentrated solutions have more solute than dilute solutions.
Question 14: How much of a 0.500 M sodium chloride solution is needed to make 500 mL of a 0.100 M solution?
Answer: 0.100 L (100 mL).
Question 15: How much of a 0.500 M hydrochloric acid solution should be used to make 250 mL of a 0.100 M solution?
Answer: 50.0 mL.
Explanation:
Given that hotter blackbodies produce more energy than cooler blackbodies, why do cooler red giants have much higher luminosity than much hotter red dwarfs?
A sample of iron was determined to have a mass of 27.3162g and a volume of 3.475 cm³. What is the density of the iron sample?
Answer:
7.859 g/cm³.
Explanation:
Density = Mass/Volume
the mass of the iron sample is 27.3162g and its volume is 3.475 cm³, so calculate its density as:
Density = 27.3162g/3.475 cm³ = 7.859 g/cm³
Therefore, the density of the iron sample is 7.859 g/cm³.
The antibiotic gramicidin A can transport Na+ ions into a certain cell at the rate of 5.0 × 107 Na+ ions/channel · s. Calculate the time in seconds to transport enough Na+ ions to increase its concentration by 7.10 × 10−3 M in a cell whose intracellular volume is 1.60 × 10−10 mL.
The amount of ions is caculated by, the formula of follows [tex]$$c=M \times V$$[/tex][tex]$C$[/tex] is the amount [tex]$M$[/tex] is the molarity and[tex]$V$[/tex] is the volume.
What is called chemical reaction?In the chemical reaction, the reaction bate is the change in concentration of reactant per unit time. The time for a reaction is calculated by the formula of fallers.
Convey the volume from [tex]$m L$ to $L$[/tex] by the conversion factor as follows
[tex]\begin{aligned}1 \mathrm{~mL} & =10^{-3} \mathrm{~L} \\1.80 \times 10^{-10} \mathrm{~mL} & =1.80 \times 10^{-10} \mathrm{mc} \times \frac{10^{-3}}{1 \mathrm{~mL}} \\& =1.80 \times 10^{-13} \mathrm{~mL}\end{aligned}[/tex]
Calculate the time by the eq [tex]$83.464 \times 10^7$[/tex]Io runt, of
[tex]$$\begin{aligned}t & =\frac{83.464 \times 10^7 \mathrm{Na}^{-1} \text { ions }}{5.0 \times 10^7 \mathrm{Na}^{-1} \text { io ry / chanel } \mathrm{s}} \\& =16.69 \text { chanel }-\mathrm{s}\end{aligned}$$[/tex]
The time required is 16.69chanel-s
Learn more about molarity
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