Which statement provides evidence that mass is conserved in the reaction?

2 hydrogen atoms are in the reactants and 2 hydrogen atoms are int he products

two new substances are formed in the products

Which is a chemical reaction?

liquid is mixed and precipitate is formed

Which of the following is a chemical reaction?

solid forms when 2 solutions are mixed

Which of the following is the best evidence of a chemical reaction?

two liquids form a new substance

two liquids mixed into a solution

Science STAAR 2025

Quiz

•

Science

•

6th - 8th Grade

•

Practice Problem

•

Medium

•

NGSS

MS-PS2-2, MS-PS1-1, MS-ESS2-6

+28

Standards-aligned

Robert Hernandez

Used 11+ times

FREE Resource

131 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many different elements?

2

4

13

50

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

4 molecules of CH₄

1 C, 4 H

4 C, 1 H

4 C, 16 H

16 C, 16 H

Tags

NGSS.MS-PS1-1

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many elements?
Na₂SO₄

1

2

3

4

Tags

NGSS.MS-PS1-1

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many sulfur atoms?
Na₂SO₄

1

2

3

4

Tags

NGSS.MS-PS1-1

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many sodium atoms?
Na₂SO₄

1

2

3

4

Tags

NGSS.MS-PS1-1

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Does this equation contain 14 atoms of oxygen?

yes

no

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Does this equation contain 14 atoms of oxygen?

yes

no

Tags

NGSS.MS-PS1-5

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