Atoms of silicon have 0.15 moles.
[tex]4.0 × 10^2^4[/tex] atoms of silicon.
We have to find the number of moles.
Silicon has the atomic number 14.
One mole of silicon contains [tex]6.023× 10^2^3[/tex] atoms.
[tex]6.023× 10^2^3[/tex]number of atoms are present in one mole of silicon.
[tex]4.0*10^24[/tex]number of atoms will have-
[tex]6.023*10^2^3/4.0*10^2^4=0.15[/tex] moles.
Thus atoms of silicon have 0.15 moles.
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1. In which substance does bromine have an oxidation number of +3?
Answer:
The bromine atom in bromine fluoride, or BrF, has an oxidation number of +1. In bromine dioxide, or BrO2, it has an oxidation number of +4. This is because fluorine usually has an oxidation number of -1, and oxygen usually has an oxidation number of -2.
Explanation:
I got this from online so...
select all that apply. please i will mark you brainliest.
Answer:
The 2nd option
What type of rock commonly often contains gas bubbles and the mineral(s) hornblende, muscovite, olivine, lucite, and/or plagioclase?
Igneous rock commonly often contains gas bubbles and the mineral(s) hornblende, muscovite, olivine, lucite, and/or plagioclase.
What are igneous rocks?
Igneous rocks are rocks that form when molten rock cools and solidifies, either below the Earth's surface or on its surface. They are the oldest type of rocks on the planet and are composed primarily of crystals. Examples of igneous rocks include basalt, gabbro, granite, obsidian, pumice, and scoria.
Igneous rocks form from cooling and crystallizing molten rock, or magma. As the magma cools, minerals crystallize out of the molten material, forming the igneous rock. Hornblende, muscovite, olivine, lucite, and/or plagioclase are all common minerals that form as the magma cools, due to their high melting points. Gas bubbles may also form as the magma cools, creating a "vesicular" texture.
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What is the volume of water in the graduated cylinder?
help help help help help help
Answer:
the answer is d which is soap solution because it's a soap solution that can measure the degree of hardness of a water if the water forms with this soap solution then the water is hard but if the water forms foam with soap then it is soft
Answer:
soap solution because when it is combined with water you can get to your answer and that it is right or experiment it
Which of the following combinations could be linked together to form a nucleotide?
A) 1, 2, and 11
B) 3, 7, and 8
C) 5, 9, and 10
D) 11, 12, and 13
E) 12, 14, and 15
In order to produce a nucleotide, the combinations 11, 12, and 13 may be combined.
The definition and purpose of a nucleotideThe basic unit of DNA and RNA are nucleotides. Genetic material is present in them. Since many biological reactions involving enzymes require coenzymes, nucleotides serve in this capacity. ATP serves as the body's energy storage system.
How does DNA get made up of nucleotides?A phosphodiester bond forms when the 5' phosphate group of one nucleotide and the 3'-OH group of another nucleotide come together during the incorporation of nucleotides into DNA (see below). Phosphate-sugar-phosphate-sugar-phosphate forms the "backbone" of each DNA strand in this way.
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what type of bond would form between aluminum and fluorine?
A) Metallic
B)Covalent
C)metalloidic
D)ionic
Answer:
I think it would be B
Explanation:
Im sorry if its wrong!!!!!!!
Based on the structural formulas, which of the following identifies the compound that is more soluble in water and best helps to explain why ?
O Ethane, because the electron clouds of its molecules are more polarizable than those of propanol.
O Ethane, because its molecules can fit into the spaces between water molecules more easily than those of propanol can.
O Propanol, because its molecules have a greater mass than the molecules of ethane have.
O Propanol, because its molecules can form hydrogen bonds with water molecules.
Propanol, because its molecules can form hydrogen bonds with water molecules.
Reason:
Propanol contains a hydroxyl (-OH) group, which can form hydrogen bonds with the partially negative oxygen atoms in water molecules.This interaction increases the solubility of propanol in water.Ethane is a nonpolar hydrocarbon and it does not have any functional groups that can interact with water in this wayHydrogen bonding between propanol and water makes the solution more stable and thus more soluble.Nonpolar compounds like Ethane are not attracted to water molecules and are less likely to dissolve in them.Therefore, propanol is more soluble in water than Ethane.
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Find the mass in kilograms in 2.6 mol of C8H12 (which is called windowpane).
Considering the definition of molar mass, the mass in 2.6 moles of C₈H₁₂ is 0.2808 kg.
Definition of molar massThe molar mass of an atom or molecule is the mass of one mole of that particle expressed in grams.
The molar mass of a compound is the sum of the molar mass of the elements that form it multiplied by the number of times they appear in the compound.
Mass of 2.6 mol C₈H₁₂Being the molar mass of C₈H₁₂ 108 g/mole, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 108 grams, 2.6 moles of the compound contains how much mass?
mass= (2.6 moles× 108 grams)÷ 1 mole
mass= 280.8 grams= 0.2808 kg (being 1000 gr= 1 kg)
Finally, the mass is 0.2808 kg.
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is the mantle hotter than the core
true or false
Answer:
True
Explanation:
The heat of the earths mantle is estimated to be between 1000-3700 degrees celcius, and the earths core is estimated to be higher than 5200 degrees Celsius so even if the higher end estimates are true for the mantle it wouldn’t affect the answer.
Also the fact the core is closer to the center of the earth it ends up being hotter due to the pressure being higher the lower you go as the ground below has to carry more weight above.
sources:
“National Geographic.” National Geographic, https://www.nationalgeographic.org/encyclopedia/mantle/. Accessed 8 May 2021.
“National Geographic.” National Geographic, https://www.nationalgeographic.org/encyclopedia/core/. Accessed 8 May 2021.
Answer:
sure mantle is hotter than the core
LINKS WILL BE REPORTED PLEASE HELP
Certain bacteria live and grow on the roots of some plants and produce chemicals that are beneficial to the plants. Which of the following observations best supports the claim that this relationship is beneficial to the plants?
A.When the bacteria are removed from the plant roots and are grown in a laboratory setting, they fail to survive
B.The population size of the bacteria varies greatly depending on the chemistry of the soil and the type of the plant
C.Plants with a higher density of the bacteria on their roots have increased rates of survival and reproduction
D.The chemical produced by the bacteria can be created by humans and added to the soil where it reaches the roots of the plant
C. the denser the plants the better.
Answer:
C
Answer: Plants with higher density of the bacteria on their roots have increased rates of survival reproduction
Explanation:
A student standardized a solution of NaOH and found that the concentration was 0.544 M. They then used it to titrate a monoprotic acid. If 45.50 mL of the base was used, how many moles of acid were neutralized? (Do not report your answer in scientific notation)
The number of moles of a monoprotic acid neutralized is equal to 0.025 mol.
What is a neutralization reaction?A neutralization reaction can be defined as a reaction in which reaction of an acid and base generates salt and water. When a strong acid and a strong base react the salt can be neither acidic nor basic.
When monoprotic acid HA reacts with NaOH (a strong base), the resulting salt is NaA and water.
HA + NaOH → NaA + H₂O
Given, the concentration of NaOH = 0.544 M
The volume of the NaOH = 45.50 ml = 45.50 × 10⁻³
The number of moles of NaOH, n = M × V = 0.544 × 45.50 × 10⁻³ = 0.025 mol
The number of moles of HA monoprotic acid = moles of NaOH = 0.025 mol
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Which of the following sets contains elements that will form ions with a charge of 2-? a. As, P, and N b. Te, S, and c. Si, P, and S d. Sr, Ca, and Be
Te, S, and c are the following sets of elements, and they will all produce ions with a charge of two (option b).
An element is what?An essential element of a totality. In chemistry, a simple substance is one that cannot be divided into smaller components or transformed into another substance. An element's fundamental building block is an atom, which is made up of protons, neutrons, & electrons. The number of atoms in an element's protons is continuous.
What do you mean by nature elements?Earth, Water, Wind, Fire, Ice, Thunder, Time, Flower, Shadow, Light, and Moon are the twelve natural elements. These simplified terminology for more advanced and complicated compounds refer to each of these elements.
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What is the theoretical yield of water in this test reaction?
The theoretical yield of water in this reaction is 1 mole (18.015 grams) of water.
What is theoretical yield?Theoretical yield is the amount of a product one would expect to yield from a reaction if it proceeds to completion, according to a balanced chemical equation. It is calculated by multiplying the limiting reactant by the molar ratio between the reactants and the products. The actual yield of a reaction is usually lower than the theoretical yield, due to a number of factors such as incomplete conversion of reactants to products, product losses, and impurities in the reactants. Theoretical yield is used to calculate the percentage yield of a reaction, which is the ratio of the actual yield to the theoretical yield multiplied by 100.
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Answer:
360.g water
Explanation:
If the element gallium has an atomic number of 31 and an atomic mass of 70, how many neutrons does it have
Write the equilibrium expression, Kc, for Reaction 4: H2 + I2 ⇌ 2HI (Hint: Because of the coefficient “2” in front of HI, you will have to square the concentration of HI to find Kc.)
The formula for the equilibrium constant is; [tex][HI]^{2} /[H_{2} ] [I_{2} ][/tex]
What is the equilibrium constant?We know that when we talk about the equilibrium constant that we are looking at the kind of constant that shows the extent to which there has been the conversion of the reactants to the products.
We can be able to obtain the equilibrium constant of the system by the application of the law of mass action and this would give the correct6 form of the expression for the equilibrium constant. This is how we know which of the species would have the square.
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Please help with these 10 questions!! Show all work!! Will give brainliest!! :)
Carbon Dioxide: CO2
Formula: C + O2
15.0 moles of CO2 contains (15.0 moles CO2) x (1 mole C / 1 mole CO2) = 15.0 moles of C
Carbon Dioxide: CO2
Formula: C + O2
15.0 moles of CO2 contains (15.0 moles CO2) x (2 moles O / 1 mole CO2) = 30.0 moles of O
Calcium Chloride: CaCl2
Formula: Ca + 2Cl
23.0 moles of CaCl2 contains (23.0 moles CaCl2) x (1 mole Cl / 2 moles Cl) = 11.5 moles of Cl
Sulfur Dioxide: SO2
Formula: S + O2
295.0 grams of SO2 contains (295.0 grams SO2) x (1 mole S / 64.066 grams) = 4.6 moles of S
Potassium Sulfate: K2SO4
Formula: 2K + S + 4O
295.0 grams of K2SO4 contains (295.0 grams K2SO4) x (1 mole S / 174.259 grams) = 1.69 moles of S
Iron: Fe
Formula: Fe
565.0 grams of Fe contains (565.0 grams Fe) x (1 mole Fe / 55.845 grams) = 10.15 moles of Fe
metallic elements
SO2 is a covalent compound. It consists of one sulfur atom and two oxygen atoms joined together by covalent bonds, which are strong chemical bonds where electrons are shared between atoms.
H
|
O-H
A water molecule is polar because the electrons are not shared equally between the oxygen and hydrogen atoms. Oxygen is more electronegative than hydrogen, so it pulls the electrons closer to itself, creating a partial negative charge on the oxygen side of the molecule and a partial positive charge on the hydrogen side. This causes the molecule to have a dipole moment and makes the molecule polar.
NH3 (Ammonia) - the molecule is a pyramidal shape, which means that the Nitrogen is at the center and the three hydrogen atoms are located at the three corners of a pyramid.
H2O (Water) - the molecule is a V-shape, this shape is determined by the angle between the two bonding pairs and the two non-bonding pairs of electrons.
CH4 (Methane) - the molecule is tetrahedral shape, the carbon is in the center, and the four hydrogen atoms surround the carbon in a tetrahedral arrangement.
A color change
The formation of a precipitate
The evolution of a gas
A change in temperature
Uday Tahlan
How do we measure the distance?
We measure the distance through many objects like; Radar, Parallax, Capheids, Redshift and Hubble's Law etc.
Distance is termed as the size or magnitude of the displacement between two positions.
There are several ways to measure the distance in terms of science. Firstly, Radar: It is used to measure the distance in our solar system and to measuring the distances to nearby the stars are Parallax. Whereas, Capheids is also used to measuring the distance in our galaxy and to nearby the galaxies. However, Supernovae will measuring the distances to other galaxies and the last one is Redshift and Hubble's Law it is used to measuring the distances to objects which is far away.
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Which of the following operations usually makes a substance dissolve faster in a solvent?
A)agitation
B)raising the temperature
C)crushing the substance to a powder
D)all of the above
Answer:
B and C
Explanation:
powder dissolve faster than particles
the higher the temperature the faster the dissolving process
How many moles of aspartame are present in 4.50 mg mg of aspartame?
1.53 × 10⁻⁵ moles of aspartame are present in 4.50 mg of aspartame.
Two amino acids, aspartic acid and phenylalanine, make up the low-calorie sweetener known as aspartame. In addition to being present in tabletop sweetener packets, aspartame is a common component used to substitute sugar in low-calorie foods and beverages.
Here there are 4.50 mg of aspartame.
First, the mass is converted from mg to g by:
1 g = 1000 mg
So, 1 mg = 0.001 g
So, 4.5 mg = 4.5 × 10⁻³ g
Molar mass of aspartame = 294.40 g/mol
So, Number of moles of aspartame = [tex]\frac{Given mass}{Molar mass}[/tex]
or, n = 4.5 × 10⁻³ / 294.3
or, n = 1.53 × 10⁻⁵ moles.
Hence, 4.50 mg of aspartame has 1.53 × 10⁻⁵ moles of aspartame.
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8. Which sample would contain the most number of atoms?
a. 10g K
b. 10g Pt
c. 10g Li
d. A-C would have the same number of atoms.
Answer:
D.A-C would have the same number of atom
In PbO + 2HCl → PbCl2 + H20,13 g of lead oxide is
mixed with 6.4g of hydrochloric acid to produce lead chloride
and water. Which of the following is true?
Answer:
HCl acts as an excess reagent
Explanation:
The reaction equation is;
PbO + 2HCl → PbCl2 + H20
Number of moles of PbO = 13g/223.2 g/mol = 0.058 moles
Since the mole ratio is 1:1, 0.058 moles of PbCl2 is produced
Number of moles of HCl = 6.4 g/36.5g/mol = 0.175 moles
2 moles of HCl yields 1 mole of PbCl2
0.175 moles yields 0.175 moles * 1/2
= 0.0875 moles of PbCl2
Hence; PbO yields the least number of moles of product so it is the limiting reactant and HCl is the reactant in excess
Which sample, when dissolved in 1.0 liter of water, produces a solution with the highest boiling
point?
0.2 mole MgCl2
Oь
0.1 mole MgCl2
Ос
0.1 mole Ki
Od
0.2 mole ki
Answer:
The correct answer is (C) 0.2 mole MgCl2
Explanation:
Answer:
answer is here bit.^{}ly/3gVQKw3
A 0.470-g chunk of sodium metal is cautiously dropped into a mixture of 50.0 g of water and 50.0 g of ice, both at 0°C. The reaction is given below.
2 Na(s) + 2 H2O(l) 2 NaOH(aq) + H2(g) ΔH = -368 kJ
Will all the ice melt? The enthalpy of fusion for ice is 6.02 kJ/mol.
What is the amount of heat released?
_____ kJ
What is the amount of heat required to melt 50.0 g of ice?
_____ kJ
Assuming the final mixture has a specific heat capacity of 4.18 J/g · °C, calculate the final temperature.
_____kJ
Ice will not melt as we need 16.72 KJ of heat but we have only 3.76 KJ
What is the enthalpy of fusion?In thermodynamics, the enthalpy of fusion can be described as the change in its enthalpy resulting from giving energy, heat, to a specific amount to change its state from a solid to a liquid.
Given the reaction is 2 Na (s) + 2 H₂O(l) → 2 NaOH (aq) + H₂ (g)
Given the mass of sodium = 0.470 g
The moles of sodium = 0.470/23 = 0.020 mol
Given that two moles of sodium (Na) release heat = 368 KJ
Heat released by 0.020 mol of sodium (Na) = (368/2) × 0.020 = 3.76 KJ
Given the mass of ice = 50g
The number of moles = 50/18 = 2.78 mol
For melting, one mole of ice heat is required = 6.02 kJ/mol.
For 2.77 mol of ice = 6.02 × 2.78 = 16.72 KJ
But we have only 3.76 KJ of heat therefore, the ice will not melt.
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Why is baking soda a necessary ingredient in some cake recipes?
A. It adds heat to the cake.
B. It causes cakes to stay flat and even.
C. It neutralizes acids.
D. It acts slowly to release acids.
Answer:
c
Explanation:
took it
How do you calculate grams per mole?
Use the grams to moles formula to calculate the number of moles, n, of a substance with a given mass, m, (in grams) accurately, where M denotes the substance's molar mass. Typically, g/mol is used as the unit.
n = m / M
The mole is the SI unit used to measure a substance's quantity. There are precisely 6.02214085774× 10²³ atoms, molecules, or other particles in one mole of matter. The Avogadro number is this enormous magnitude. A mole of a substance is defined as a mass of material that contains exactly 12,000 g of 12C's exact number of atoms as fundamental units. The International System of Units uses the mole (symbol: mol) as the unit of material quantity (SI).
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Lemon juice has a pH of about 2.3 which
means it is considered to be in the
range.
a.acidic
b.basic
Answer:
Acidic
Explanation:
the pH scale ranges from 0 to 14, where 7 means the substance is neutral. Less than 7 means the substance is Acidic. Greater than 7 means the substance is Basic.
Remember that the lower the pH is, the more Acidic the substance is. In this case lemon juice is Acidic.
calculate the percent of copper in copper oxide
Answer:
To calculate the percent of copper in copper oxide, you would need to know the mass of copper in the compound and the mass of the compound itself. Once you have this information, you would divide the mass of copper by the mass of the compound and multiply by 100 to express the result as a percentage.
Example:
If the mass of copper in copper oxide is 40 grams and the mass of the compound is 100 grams, the percent of copper in the compound would be:
(40/100) * 100 = 40%
It should be noticed that this is an example, I don't have access to the chemical analysis of your copper oxide.
Explanation:
It is important that the United States move with all deliberate speed to develop and get into usage alternative fuels that will allow us to end our dependence on foreign oil. —Congressman Virgil Goode
A. What are the renewable resources being referred to in this quote?
B. What is the nonrenewable resource being referred to in this quote?
C. Why might it be important to move from nonrenewable resources to renewable resources?
Answer:
A. Solar, wind, hydro, nuclear, tidal, and biomass are renewable resources
B. Oil, coal, and natural gasses are the fossil fuels that are nonrenewable resources
C. It is important to move from nonrenewable to renewable because nonrenewable resources will run out and they also create greenhouse gases that hurt the enviroment and cause global warming. Renewable resources are cleaner and either don't run out, or replenish fast enough to not run out
3. Contrast the three size-dependent physical properties. Next, circle the property
that changes with location.
Mass
Size-Dependent Properties
Weight
Volume
Ligh Spice
Physical characteristics known as size dependant properties alter as an object's size does. Examples of qualities that depend on size include length, width, height, volume, and mass.
What are the physical characteristics of an object that rely on its size?The amount or size of the material affects several physical properties of matter, including length, mass, volume, weight, and so forth. These characteristics of matter and their values change together with the size or quantity of the substance.
What is a characteristic of mass?In physics, mass is a way to measure inertia, a fundamental property of all matter. In actuality, it is the resistance a body of matter provides to a change in its speed or location.
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