CHEMISTRY MIDDLE SCHOOL

What combines to form compounds?A.) Molecules
B.) Atoms of Element
C.) Minerals
D.) Valences

Answers

Answer 1
Answer:

Hello! Glad to help.

From what I have learned in my ICP class, molecules combine together to form componds.  A compound is any molecule that is made up of two or more different elemental atoms.

Hope this helps you! Anymore questions? Just ask.

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Classify the chemical equations as being balanced or not balanced

Answers

Answer: Two of them are balanced and two of them are unbalanced.

Explanation:

A balanced chemical equation is defined as the equation in which total number of individual atoms on the reactant side is equal to the total number of individual atoms on the product side. These equations follow law of conservation of mass.

An unbalanced chemical equation is defined as the equation in which total number of individual atoms on the reactant side is not equal to the total number of individual atoms on the product side. These equations does not follow law of conservation of mass.

For the given chemical equations:

Equation 1:  2CO+2NO\rightarrow 2CO_2+N_2

As, number of carbon, nitrogen and oxygen atoms on the reactant side is equal to the number of carbon, nitrogen and oxygen atoms on the product side. Thus, this is a balanced chemical equation.

Equation 2:  6CO_2+6H_2O\rightarrow C_6H_(12)O_6+O_2

As, number of oxygen atoms on the reactant side is not equal to the number of oxygen atoms on the product side. Thus, this is not a balanced chemical equation.

Equation 3:  H_2CO_3\rightarrow H_2O+CO_2

As, number of carbon, nitrogen and oxygen atoms on the reactant side is equal to the number of carbon, nitrogen and oxygen atoms on the product side. Thus, this is a balanced chemical equation.

Equation 4:  2Cu+O_2\rightarrow CuO

As, number of oxygen and copper atoms on the reactant side is not equal to the number of oxygen and copper atoms on the product side. Thus, this is not a balanced chemical equation

Hence, two of the equations are balanced and two are unbalanced.

1,2,4 are not balanced, 3 is balanced

What is the balanced equation for S8 +O2 →SO3

Answers

Answer:

S8 + 12O2 ---> 8SO3

Explanation:

S8 + 12O2 ---> 8SO3

What is an example of chemical energy transforming into electrical energy?-wood burning to make a fire
-atoms splitting to make heat which in turn turns a generator to make electricity
-car battery turning a car on
-food making you run

Answers

Answer:

A car battery turning a car on.

Please help!!!The reaction of sulfuric acid (H2SO4) with potassium hydroxide (KOH) is described by the equation below. Suppose
0.06 L of KOH with unknown concentration is placed in a flask with bromthymol blue indicator. A solution of 0.20 M
H2504 is dripped into the KOH solution. After exactly 0.017 L of H2SO4 is added, the Indicator changes from blue to
yellow. What is the concentration of the KOH? You must show all of your work to earn credit. (4 points)
H2SO4 + 2KOH → K2SO4 + 2H20

Answers

Answer:

         \large\boxed{\large\boxed{1M}}

Explanation:

1. Reaction

  H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O

2. Mole ratio

    (2molKOH)/(1molH_2SO_4)

3. Sulfuric acid

     Molarity=(moles)/(volume(liters))

     Moles=Molarity* Volume(liters)

     Moles=0.20M* 0.017liter=0.034molH_2SO_4

4. Potassium hydroxide

    (2molKOH)/(1molH_2SO_4)* 0.034molH_2SO_4=0.068molKOH

    Molarity=(0.068mol)/(0.06liter)=1.13M\approx 1M

How do we separate sugar solution with sand

Answers

A sugar solution with sand can be separated by dissolving the solution into water, then the sugar will be dissolved with the water and the sand will stay on the bottom of the water.
you can separate both sand and sugar by adding water because sugar will dissolve sand cannot

Solids are usually more dense than:1. gases
2. liquids
3. plasmas
4. all of the above

Answers

4.all of the above is the answer

Answer:

All of the above

Explanation:

Hopes this helps, let me know if it's not.
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