Which of the following chemical equations follows the Law of Conservation of Mass? Hint: which is balanced?

C 6 O + H 12 O --> C 6 H 12 O 2

CO 2 + H 2 O --> C 6 H 12 O 6 + O 2

CO 2 +H 2 O --> C 6 H 12 O 6 +O 2

Which of the following pictures is an example of a chemical change?

ice melting in water in a beaker

For an investigation a student poured a blue solution of CuSO 4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and wrote down the changes. Which change shows that a CHEMICAL REACTION took place?

A dark solid (precipitate) formed on the zinc metal.

The zinc metal stayed silver-colored and shiny

The CuSO 4 solution evaporated after the zinc metal was added.

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

Coal is made up of more than one element

How is a physical change different from a chemical change?

Chemical changes produce a new substance, physical changes stay the same substance

There is absolutely no difference

Chemical changes create and destroy matter, physical changes don't

Physical changes create and destroy matter, chemical changes dont

A student listed how different parts of the body work to aid in the digestion of food. Which of the following is a chemical change that occurs to the food?

The breakdown of molecules of food by enzymes and acid in the stomach to form new substances

The food particles break into smaller pieces as food is chewed

The movement of food to the stomach after food is swallowed

Chemical Formulas, Equations, and Reactions

Authored by Lorie Logan

Chemistry

8th Grade

NGSS covered

Used 944+ times

Chemical Formulas, Equations, and Reactions

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20 questions

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MULTIPLE CHOICE QUESTION

5 mins • 5 pts

Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)

H₃SO₄

HSO₄

H₄S₃O

H₂O

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

5 mins • 5 pts

How many elements are in C₆H₁₂O₆?

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

5 mins • 5 pts

In the equation, 2Mg + O₂ ---> 2MgO, which are the reactants?

2Mg and O₂

2MgO

Mg and MgO

O and MgO

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

5 mins • 5 pts

Which is NOT an example of chemical change?

production of gas.

change in color.

change in size.

transfer of energy.

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

5 mins • 5 pts

2H₂O + 2N → 4H + 2NO
The chemical symbols on the RIGHT (at the end of the equation) are called:

products

reactants

yields/produces

MULTIPLE CHOICE QUESTION

5 mins • 5 pts

How many atoms are represented in the reactants of this equation?

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which of the following could be an organic compound? Hint: organic means it contains Carbon!

NH₃

H₂O

CaCl₂

CH₄

Tags

NGSS.MS-PS1-1

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Chemical Formulas, Equations, and Reactions

Which is the correct formula for: three hydrogen (H)one sulfur (S)four oxygen (O)

How many elements are in C6H12O6?

In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?

Which is NOT an example of chemical change?

2H2O + 2N → 4H + 2NOThe chemical symbols on the RIGHT (at the end of the equation) are called:

How many atoms are represented in the reactants of this equation?

Which of the following could be an organic compound? Hint: organic means it contains Carbon!

Which of the following chemical equations follows the Law of Conservation of Mass? Hint: which is balanced?

Which of the following pictures is an example of a chemical change?

Which of the following models best demonstrates a balanced chemical equation?

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Discover more resources for Chemistry

Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)

How many elements are in C₆H₁₂O₆?

In the equation, 2Mg + O₂ ---> 2MgO, which are the reactants?

2H₂O + 2N → 4H + 2NO
The chemical symbols on the RIGHT (at the end of the equation) are called: