Answer: to calculate pH use -log[H+] or - log[OH-]..the solution is basic as the “NaOH” is attached to a hydroxide.Since we need to find the pH (per hydrogen) and not the pOH( per hydroxide) we need to find the pOH of the substance first then we subtract that by 14 so we can arrive at the pH of the substance.
Explanation: So -log( 1 x 10^(-5)) = 5 which is the pOH.Now we subtract that by 14 which gives us -9 and now you’d multiply that by -1 bcuz we can’t have a negative so the pH of the substance is 9
A mixture of gases contains oxygen, nitrogen, and hydrogen at 0 degrees Celsius. The partial pressure of the oxygen gas is 20 kPa, the partial pressure of nitrogen gas is 40 kPa, and the partial pressure of hydrogen gas is 14 kPa. What is the total pressure exerted
The total pressure exerted by the gas mixture is 74 kPa.
What is hydrogen?Hydrogen is an odorless, colorless, and tasteless gas that is the most abundant element in the universe. It is the lightest of all elements and is a component of many compounds, such as water and hydrocarbons. Hydrogen has the highest energy content of any common fuel, making it an attractive energy source. Additionally, it is utilised in the manufacture of fertiliser, polymers, and pharmaceuticals as well as a propellant.
This is calculated by adding up the partial pressures of each individual gas in the mixture, which in this case is 20 kPa for oxygen, 40 kPa for nitrogen, and 14 kPa for hydrogen. 20 + 40 + 14 = 74
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at the left.
2. Which of the following is not a
chemical change? E
A leaves turning color
B fruit ripening
C silver tarnishing
D food coloring dissolving in water
Answer:
D
Explanation:
there is no new substance formed
water is added to 5g of nacl, resulting in a total solution volume of 100 mL. what is the molarity of the nacl solution
A total volume of 100 mL of solution is created by mixing 5g of NaCl with water. The NaCl solution has a molarity of 0.151515.
Weight of NaCl=5 gm.
No.of moles of NaCl = Weight/ Mole .Wt =5/58.5= 0.08547
Weight of water= 100 gm.
Number of water moles = Weigh/Mole Wt =100/18=5.55556
Mole. Fraction of NaCl
=No.of moles of NaCl/ No.of molesNaCl+H2O =0.08547/(0.08547+5.55556)
=0.08547/5.64103 =0.151515
The amount of moles of a solute in a litre of solution is known as its molarity. A capital M is used to represent molarity.
A solution in chemistry is a combination of two or more compounds in which neither ingredient undergoes a chemical transformation. For instance, salt water is a solution that contains both salt and water (the solvent) (the solute). The concentration of a material in a solution is its amount of dissolution. In other words, it refers to the number of ingredients that have been added to your drink. In molarity, concentration is often expressed.
A mole is a fundamental chemical unit. It is the mass of a substance (in grammes) that has the same number of atoms, molecules, or ions as 12 grammes (6.022 x 1023) of carbon-12.
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Consider the below electrochemical cell at standard conditions. Which of the following changes
would result in a voltage larger than 1.29 V?
4MnO4- (aq) + 4H+ (aq) + 4MnO2 (s) + 3O2 (g) + 2H2O E° = 1.29 V
a. Increase the partial pressure of oxygen gas.
b. Increase the mass of solid manganese(IV) oxide present.
C. Increase the pH.
d. Increase the concentration of potassium permanganate.
girl i need help with this toofrom the electrochem lab :(
funny how i found this
What is the definition of a commission? * 4 points Earnings based on how much they sell What you are paid to work. When you are paid to work on a mission as a coworker.
Answer:
Earnings based on how much they sell
Explanation:
A sales presentation can be defined as series of talk given by a salesperson with the attempt to persuade someone or a potential customer to buy a particular product, by giving information it. Some salespersons resort to the use of dramatics so as to initiate and close the sale of a particular product by engaging in series of theatrical actions.
In sales and marketing, the term closing with respect to a sales can be defined as the process of making a business sale successful such as through the exchange of money for a particular product or goods.
For a salesperson to be able to close a sales, he or she require abilities such as courage, negotiation skills, listening ears and interpersonal skills to do so or achieve a successful sales. After a successful sales, they're entitled to a percentage of the amount made from selling a particular product or closing a deal based on what is stated in the contract. These amount of money earned with respect to each sales is generally referred to as commissions.
Commission can be defined as an amount of money earned based on how much a salesperson sell.
HELPPPP!!! SHOW WORK
On the day this exercise was written, atmospheric pressure was 745.8 mm Hg. Calculate the pressure in units of atmospheres, cm Hg, lbs./in2, and torr
Answer:
1) 0.98 atm
2) 74.58 cmHg
3) 14.47 lbs./in²
4) 745.8 torrs
Explanation:
We are given the atmospheric pressure as 745.8 mmHg
1) Converting mmHg to atmospheres(atm), we divide the pressure by 760.
P = 745.8/760
P = 0.98 atm
2) Converting mmHg to cmHg, we multiply the pressure by 0.1;
P = 745.8 × 0.1
P = 74.58 cmHg
3) Converting mmHg to lbs./in², we divide the pressure by 51.75;
P = 748.5/51.715
P = 14.47 lbs./in²
4) Converting mmHg to torrs, we multiply the pressure by 1;
P = 745.8 × 1
P = 745.8 torrs
How do you find a proton number?
To find a proton number, we can use the Periodic Table of the Elements.
What is the Periodic Table of the Elements?The Periodic Table of the Elements is a table that organizes all discovered chemical elements in rows and columns according to the increasing atomic number.
To find the numbers of protons using this periodic table, first, we have to find the element on the periodic table. Using the columns (group) or rows (period) can make the element easier to find on the table.
Second, find the element’s atomic number, which is located above the element symbol, in the upper left-hand corner of the square. This atomic number will tell us how many protons make up a single atom of that element. For example, Boron (B) has an atomic number of 5, consequently it has 5 protons.
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Provided below are pictures of three different scnearios in which two different chemicals are mixed together. for each scenario, make a claim about whether or not a chemical reaction is occuring. Provide evidence and reasoning to support your claim. If a reaction cannot be determined based on the provided picture, explain why not and how you could determine if a reaction has occured. Use specific examples in your explanation.
Looking at the images that we have, we can see that there is a reaction in the images A and C.
What is a reaction?We would need to settle in our minds what is implied when we talk about a chemical reaction. You have to know that if we are talking about a chemical reaction then we are talking about the kiondfs of reaction that would lead to the following observations;
1) There is a change in the temperature of the system
2) There is an effervescence of gas in the system
3) There is a change in color
4) There is the appearance of a solid in the system
We would now have to look at all the setups that we have here and we have to look at it in such a way that we could know if there is a reaction that is going on in any of them as shown.
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What is the molecular formula of the molecule in figure 3
Answer: The molecular formula of the molecule is [tex]CH_3OH[/tex]
Explanation:
Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.
The given compound contains one carbon atom, four hydrogen atoms and one oxygen atom.
It is an alcohol with functional group -OH and with molecular formula of [tex]CH_3OH[/tex] named as methanol.
The molecular formula of the molecule is [tex]CH_3OH[/tex]
The molecular formula of the molecule in figure 3 is [tex]CH_3OH[/tex].
The following information should be considered:
The molecular formula represents the chemical formula in which the actual no of atoms for each & every element should be presented in the compound. In the given compound, it comprise of 4 hydrogen atoms, 1 oxygen atom, 1 carbon atom. It is the alcohol having functional group i.e. -OH along with the molecular formula i.e. [tex]CH_3OH[/tex] that we called as the methanol.
Therefore we can conclude that the molecular formula of the molecule in figure 3 is [tex]CH_3OH[/tex].
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A screw has _____ over the cylinder.
corkscrew-shaped ridge
What is a screw’s output?The screw’s applied force (output force) is always larger than the screw’s applied force (input force). As a result, a screw’s mechanical advantage is always larger than one.Screws are a type of basic machine. They have a thread, which is a corkscrew-shaped ridge wrapped around a cylinder. When driving in a screw, the head is particularly designed to allow a screwdriver or wrench to hold the screw.
Another sort of inclined plane is the screw. When an inclined plane wraps around a straight rod-like structure, a spirally grooved surface with a pointed end is generated. It serves to keep things together.
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HOW TO DO THIS QUESTION PLEASE
Answer:
solid
Explanation:
lithium is a solid so it would still be solid since it is at 100 degrees and has not yet gotten to 180 degrees which is when it melts
Which would best describe the properties of lodine?
a. Not reactive with any other element
b. Not malleable, not ductile, lower density
c. Malleable, ductile, conductive
d. Exists as a gas
I'm pretty sure it's B :)
List some of the methods used to prevent or slow corrosion with detailed explanation
Answer:
There are several methods that can be used to prevent or slow corrosion:
Coatings: Applying a protective coating to a metal surface can prevent corrosion by creating a barrier between the metal and the environment. Common types of coatings include paint, galvanizing, and electroplating.
Cathodic protection: Cathodic protection involves applying a current to a metal surface in order to reduce the potential difference between the metal and its environment. This can help to prevent corrosion by reducing the electron flow that drives the corrosion reaction.
Inhibitors: Corrosion inhibitors are chemical substances that can be applied to a metal surface to slow or prevent corrosion. These substances work by reacting with the metal surface or the environment to form a protective film or layer.
Passivation: Passivation is a process that involves removing surface contaminants and oxide layers from a metal surface in order to improve its corrosion resistance. This can be achieved through chemical or mechanical means.
Materials selection: Choosing corrosion-resistant materials for specific applications can help to prevent or slow corrosion. For example, stainless steel is a commonly used material for corrosive environments because of its high resistance to corrosion.
Environmental control: Controlling the environment in which a metal object is used can also help to prevent or slow corrosion. For example, reducing humidity or keeping a metal object dry can help to prevent corrosion.
Maintenance: Regular maintenance, such as cleaning and inspection, can help to identify and address corrosion issues before they become severe. This can include removing corrosion products, repairing damage, and applying protective coatings as needed.
Which of the following is consistent with an exothermic reaction that is nonspontaneous at high temperatures?
A.
?H > 0, ?S > 0, ?G < 0
B.
?H < 0, ?S < 0, ?G > 0
C.
?H < 0, ?S > 0, ?G > 0
D.
?H > 0, ?S < 0, ?G < 0
E.
?H < 0, ?S > 0, ?G < 0
As a result, option c is correct: H must be negative and S must be positive.
What is exothermic reaction?Energy is transmitted to or from the surroundings when a chemical reaction occurs. An exothermic reaction occurs when energy is transmitted to the surroundings, and the temperature of the surroundings rises. The term exothermic implies "heating up." As an exothermic process progresses, energy, frequently in the form of heat, is released. An exothermic reaction is one that is chemical in nature and is characterized by the release of energy in the form of heat or light. Matching a light with a matchstick is an example of this sort of reaction in which the release is both heat and light.
Here,
The spontaneity can be determined by the equation as:
ΔG=ΔH−TΔS
If the Gibbs free energy is negative, it gives a spontaneous reaction. Hence, the ΔH must be negative and ΔS must be positive.
If the Gibbs free energy is positive then it will be non-spontaneous. Hence, ΔS must be negative at very high temperature.
Therefore, option c is correct that is the ΔH must be negative and ΔS must be positive.
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Cuál es la densidad (g/ml) de un líquido de batería de automóvil, si tiene un volumen de 0,125 L y una masa de 155g??
Answer:
xbvmyyyxxxsaqqqeerzdyxctzzvjmih
Which statement best describes the sun earth moon system during a spring tide
The moon the sun and earth form a right angle
The sun the moon and earth are in a straight line
The sun is between moon and earth
The moon is in the first quarter face
Answer:
yung una po
Explanation:
kasi meron yan sa grade 6
Answer:
The Answer Is B The Sun,The Moon,And Earth Are In A Straight Line
Explanation:
Hope This Helps!
A gas has a pressure of 120 kPa, a temperature of 400 K and a volume of 50.0 mL. What volume will the gas have at a pressure of 60 kPa and a temperature of 200 K
The gas will have a volume of 25.0 mL at a pressures of 60 kPa or a temperature of 200 K.
What is temperature?The average kinetic potential of the particle in a system is measured by temperature. Temperature is measured using thermometers, which measure the temperature of a system by taking a reading of the system's average kinetic energy. Temperature is measured in degrees, with higher temperatures indicating a higher average kinetic energy. Temperature can be affected by a variety of factors, including the amount of energy added to or removed from a system, the number of particles present in the system, and the type of particles present in the system.
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Which statement most accurately describes a chemical equation?
a. in a chemical reaction, the mass of the energy change must be equal to the energy used
b. in a chemical reaction, the mass of the products must equal the mass of the reactants
c. in a chemical reaction, the mass of each product must be the same
d. in a chemical reaction, the combined mass of the container the substances is always equal
Answer: C
Explanation:
What is the mass of 10 g?
The amount of matter contained within an object is commonly referred to as mass. The most typical way to measure it is as inertial mass, which refers to an object's resistance to acceleration under the influence of a net force.
Although the size of an object and its mass are frequently associated, larger objects do not always have more mass. For instance, an inflated balloon would have substantially less mass than a silver golf ball. Although there are numerous alternative units used to describe mass around the world, the kilogram is the accepted unit of mass according to the International System of Units (SI) (kg).
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Why do halogens get less reactive?
The halogens gets less reactive as we move down the group because the atomic mass will increases and the number of the electrons are increases.
The halogens get less reactive as we move top to bottom in the group in the periodic table as the atomic mass of the group 17 elements that is halogens will increases and as we move from from top to bottom in the periodic table the electrons are added and the number of electrons are increases.
This is reason , that the reactivity of the group 17 elements that is halogens will decreases as we move from top to bottom.
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A sample of gas occupies 6.00 L at a temperature of 200 K. If the pressure remains constant and the temperature is raised to 600 K, the volume of the gas sample would be:
The Ideal Gas Law states that the volume of a gas is proportional to its temperature at constant pressure.
What is pressure?Pressure is a force that is applied to an object over an area. It is measured in units of force per unit area, such as Pascals (Pa). Pressure can be applied in a number of ways, such as by squeezing, pushing, or compressing. It can also be caused by the weight of an object, or the force of gravity. Pressure can be used to do work, such as moving an object or creating heat.
This means that if we double the temperature, we will double the volume. Therefore, if the temperature of the gas sample is raised from 200 K to 600 K, the volume of the gas sample will increase from 6.00 L to 12.00 L.
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Determine whether each of the following compounds is a molecular compound or an ionic compound. How can you tell?
a. ) PBr₃
b. ) KBr
c. ) Iron (III) Oxide
d. ) Carbon Tetraiodide
PBr₃ and Carbon Tetraiodide is a covalent compound. Whereas, KBr and Iron (III) Oxide is an ionic compound.
Covalent compounds and molecular compounds are those compound where two non-metals, or a non-metal are bonded to each other through the sharing pair of electrons.
PBr₃ are covalent because phosphorous is in the column 3 in periodic system and it has three valence electrons in its outer shell. Therefore, in case of Carbon Tetraiodide carbon and iodide both are non-metals that why they are covalent compounds.
KBr and Iron (III) Oxide both are Iron (III) Oxide because they are formed by the interaction between a metal and non-metal. They will transfer the electrons from positively to negatively charged atoms.
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Calculate the molality of each of the following aqueous solutions (a) 2. 50 m nacl solution (density of solution = 1. 08 g/mL) (b) 48. 2 percent by mass KBr solution
The molarity of 2. 50 m NaCl solution is 2.68 molal and 48. 2 percent by mass KBr solution is 7.82 m.
Molality = moles solute / kg solvent
Assume we have 1000 ml of solution.
1000 ml ₓ 1.08 g/ml = 1080 g
Now find the mass of NaCl:
2.50 M NaCl = 2.50 mol/L and 2.50 mol/L x 1 L = 2.50 moles of NaCl
molar mass NaCl = 58.4 g/mol, therefore mass NaCl present = 2.50 mol ₓ 58.5 g/mol = 146 g NaCl
Now find the mass of H₂O:
grams H₂O present = 1080 g - 146 g = 934 g H2O = 0.0.934 kg
We now have moles NaCl and kg H₂O
Molality = 2.50 mol / 0.934kg = 2.68 molal
48.2% by mass of KBr means 48.2 g KBr / 100 g solution
To find molality, we need moles of KBr and kg of H₂O. We can easily find he moles of KBr from the mass and the molar mass.
If we have 100 g solution, 48.2 g is KBr so the rest is H₂O.
100 g - 48.2 g = 51.8 g H₂O and this is equal to 0.0518 kg H₂O
Moles KBr = 48.2 g KBr ₓ 1 mol KBr/119 g = 0.405 moles KBr
Molality = 0.405 moles KBr / 0.0518 kg H₂O = 7.82 m
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Which forces can be represented in a free body diagram
Classify the reaction in each of the following equations.
a. FeCl2 (aq) + Mg → MgCl2 (s) + Fe(s)
b. NH3 (g) → N2 (g) + H2 (g)
Answer
a. Single displacement
b. Decomposition
When classifying chemical reactions, consider how reactants change to form the products.
An equation for a chemical reaction has a left side and a right side. The arrow separates the left and right sides.
The left side is called the reactants. The right side is called the products.Each product or reactant can be one or more elements.
Some Types of ReactionsWe can use letters* to represent products and reactants in a reaction.
SynthesisTwo reactants become one product.
A + B → ABDecompositionOne reactant becomes two products.
AB → A + BIn equation (b), this is like how NH₃ separated into two products, N₂ and H₂.Single DisplacementStart with two reactants, a compound and an element. To form the products, the element replaces one of the elements that was in the compound.
AB + C → AC + BIn equation (a), this is like how Mg replaced Fe. Fe was part of a compound at first. Now, Mg is part of a compound instead.Double DisplacementStart with two reactants that are compounds. To form the products, an element from each compound replaces each other.
AB + CD → AC + BDTherefore, equation (a) is a single displacement reaction and equation (b) is a decomposition reaction.
*Each letter represents an element. Two elements make a compound. A letter can also represent a compound if compound stays together during the reaction.
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Can you help me please
Answer:
the last one
explanation is the white colour
Which element doe not form a table ion with the ame electronic configuration a neon?
A Magneium B Fluorine C Sodium D Chlorine
Sodium does not form a stable ion with the same electronic configuration as neon.
Electronic configuration of an element describes that how the electrons are distributed in its atomic orbitals. Electronic configuration of an atoms follows a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.
Sodium (Na) ion has the same electronic configuration as that of neon. Both are the isoelectronic species with 10 electrons and the electronic configuration is 1s22s22p6.
Sodium has electronic configuration is 1s22s22p63s1. It loses one electron to give Na+ ion with the electronic configuration of neon (Ne).
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Which of the following is an incorrect statement?
Sound is not a form of energy.
Light is a form of energy.
Sound is a form of energy.
Heat is a form of energy.
Answer: Heat is not a form of energy
sound is a form of energy
Explanation:
A new candy has a very sour taste. If this candy were dissolved in water, the solution would likely be _______.
Answer:
It is a sour candy. And when you put it in water it will dissolves.
Explanation:
Why does the water creep up the paper? Explain this. Draw the molecular interactions associated with the macroscopic observation.
( I only need the drawing to be honest and I would really appreciate it if you could explain it)
Capillary action involves the hydrogen bonding in water.
What is capillary action?We have to note that when we are talking about capillary action, what we mean is the movement of water up the paper. We know that this movement of water would have a lot to do with the kind of intermolecular interaction that is going on.
Note that the water is composed of polar O-H bonds that can be able to interact with the -OH bonds that can be seen in the cellulose that is water and this accounts for the capillary action in water.
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