CHEMISTRY HIGH SCHOOL

Which compound reacts with an acid to produce water and a salt(1) CH3Cl
(2) CH3COOH
(3)KCl
(3)KOH

Answers

Answer 1
Answer: KOH is the only base, and any neutralization reaction produces a salt and water
Answer 2
Answer: I'm not exactly sure which one but I do know that an acid and a base react in a aqueous solution to form water, so i would probably eliminate the ones that aren't aqueous solutions.

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What energy resource can be used instead of fossil fuel

Answers

We could use solar power, wind power, geothermal power, hydroelectric power, or nuclear power. There are probably more but this is what I can think of off the top of my head. I hope this helps. Let me know if anything is unclear.

How many atoms are in 1.75 mol of ecules oh NH^3

Answers

1 mole ----------- 6.02x10²³ atoms
1.75 moles ------- ?

atoms = 1.75 * 6.02x10²³ / 1

= 1.053x10²⁴ atoms

hope this helps!

Adding solvent or removing solute from a soltuion is called __________, and a solution is said to be _______________ if it has more solute.

Answers

Adding solvent or removing solute from a solution is called diluting. And a solution is said to be concentrated if it has more solute. The opposite of diluting is called concentrating. The measure of the amount of solute in a solution is expressed in concentration.

Which of the following will stay constant, no matter if the substance is in the solid, liquid, or gas state? volume shape temperature mass

Answers

Answer : The correct option is, Mass

Explanation :

As we know that there are 3 states of matter :

Solid state : It is a state in which the particles are closely packed and does not have any space between them. This state have a definite shape and volume.

Liquid state : It is a state in which the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another. This state have a definite volume but does not have a fixed shape.

Gaseous state : It is a state in which the particles are loosely arranged and have a lot of space between them. This state have indefinite volume as well as shape.

If we are taking 100 grams of ice then after melting its mass remains same but its shape, volume and temperature will be changed and after evaporation its mass remains same but its shape, volume and temperature will be changed.

Hence, the mass will stay constant, no matter if the substance is in the solid, liquid, or gas state.

Answer:

The correct answer is mass

Explanation:

Hello!

Let's solve this!

In the solid state, where the molecules occupy a definite place, and remain still, the shape and volume remain constant.

In the liquid state the molecules take the form of the container that contains them. So the shape is not defined but the volume is defined.

In the gaseous state the molecules are disordered, and have neither defined volume nor shape.

In all three states the mass remains constant.

The temperature causes the change of state.

We conclude that the correct answer is mass

A saline solution with a mass of 400 g has 30 g of NaCl dissolved in it. What is the mass/mass percent concentration of the solution?

Answers

(g solute/g solution)*100 = % mass/mass

30 g / 400 * 100 

0,075 * 100

= 7,5% w/w

hope this helps!

How would you solve this problem??

Answers

Calculate the pOH where [OH⁻]=4.7×10⁻³M:
pOH=-log[OH⁻]
pOH=-log(4.7×10⁻³)
pOH=2.33

Calculate [OH⁻] if the pOH is 1.34:
pOH=-log[OH⁻]
10^(-pOH)=[OH⁻]
[OH⁻]=10^(-pOH)
[OH⁻]=10^(-1.34)
[OH-]=0.0457M or [OH⁻]=4.57×10⁻²M

Calculate pH if the [OH⁻] is 1.74×10⁻²M:
[H⁺]=K(w)/[OH⁻]              or                  pOH=-log[OH⁻]
[H⁺]=(1×10⁻¹⁴)/(1.57×10⁻²)                   pOH=-log(1.74×10⁻²)
[H⁺]=6.369×10⁻¹³M                              pOH=1.759
pH=-log[H⁺]                                          pH=14-pOH
pH=-log(6.369×10⁻¹³)                           pH=14-1.759
pH=12.2                                               pH=12.2

I hope this helps.  Let me know if anything is unclear.
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