Unit test review

Unit test review

Assessment

Flashcard

Science

8th Grade

Practice Problem

Easy

Created by

Laura Westerlage

Used 1+ times

FREE Resource

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47 questions

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1.

FLASHCARD QUESTION

Front

Does this equation follow the law of conservation of mass? 2NaCl + 1F2 -> 2NaF + 1Cl2

Back

Yes

2.

FLASHCARD QUESTION

Front

In a chemical reaction, 300 grams of reactant A are combined with 100 grams of reactant B. Both A and B react to completion. How much will the product weigh?

Back

400

3.

FLASHCARD QUESTION

Front

Can mass be created or destroyed?

Back

No

4.

FLASHCARD QUESTION

Front

Does this equation follow the law of conservation of mass?

Media Image

Back

Yes

5.

FLASHCARD QUESTION

Front

A closed system contains a reaction where 8 grams of hydrogen (H₂) react with 32 grams of oxygen (O₂) to produce water (H₂O). Calculate the total mass of the reactants before the reaction occurs, the total mass of the products after the reaction occurs, and explain how your calculations support the law of conservation of mass.

Back

40 grams before, 40 after, follows law of conservation of mass

6.

FLASHCARD QUESTION

Front

Which of the following is an example of a physical change? Rust forming on iron, Ice melting into water, Baking a cake, Digestion of food

Back

Ice melting into water

7.

FLASHCARD QUESTION

Front

Which of the following indicates a chemical change has occurred?

  • Change in state
  • Change in shape
  • Production of gas
  • Mixing of two substances

Back

Production of gas

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