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Chemical Reactions Pretest

Authored by Peter Joseph Goggin

Science

9th Grade

NGSS covered

Used 1+ times

Chemical Reactions Pretest
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20 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?

There is no relationship

The mass of the reactants is greater

The mass of the products is greater

The masses are equal

Tags

NGSS.MS-PS1-5

2.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

How many grams of AgCl (the section marked with an x) are produced by the reaction?

30.0 g

16.0 g

46.0 g

22.0 g

Tags

NGSS.MS-PS1-5

3.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Which of the following is a balanced equation for the synthesis of water (H₂O)?

H₂ + O₂ → H₂O

H₂ + 2 O₂ → 2 H₂O

H₂ + 2 O₂ → H₂O

Tags

NGSS.MS-PS1-5

4.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

If 10 g of mercury oxide (HgO) breaks down to make 0.7 g of mercury (Hg), how much oxygen (O) will be produced?

17 g

1g

9.3g

10.7g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

5.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

In which type of reaction does a compound break down into 2 or more simpler substances?

synthesis

decomposition

single displacement

double displacement

6.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Sometimes two aqueous solutions can react in a double replacement reaction and produce a solid. This solid produced by liquid solutions has a specific name. What is it?

Product

Reactant

Precipitate

Isotope

7.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

What do subscripts tell you in a chemical formula?

the number of atoms of each type of element present in a molecule

the number of units of each substance in a reaction

which substances are about to react

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