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chemical reactions 3

Authored by Charles Ibeling

Biology

7th Grade

Used 4+ times

chemical reactions 3
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23 questions

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1.

MULTIPLE CHOICE QUESTION

45 sec • 5 pts

The changes that are visible during a chemical reaction are signs that what is being rearranged in the reactants?

electrons

atoms

products

nuclei

2.

MULTIPLE CHOICE QUESTION

45 sec • 5 pts

What type of reaction has the reactant broken down into other substances?

synthesis

decomposition

combustion

single replacement

3.

MULTIPLE CHOICE QUESTION

45 sec • 5 pts

What is the right part of a chemical equation called?

2H2 + O2 ---> 2H2O

Reactants

Yields

Products

Chemical Equation

4.

MULTIPLE CHOICE QUESTION

45 sec • 5 pts

What is the left part of a chemical equation called?

2H2 + O2 ---> 2H2O

Reactants

Yields

Products

Chemical equation

5.

MULTIPLE CHOICE QUESTION

45 sec • 5 pts

How many Mn atoms are found in the following compound?

2MnO4

1

2

4

8

6.

MULTIPLE CHOICE QUESTION

45 sec • 5 pts

What is the little number after an element in a chemical equation called?

Example: H2

Coefficient

Atom

Subscript

Equation

7.

MULTIPLE CHOICE QUESTION

45 sec • 5 pts

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2

1
2
3
4

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