CHEMISTRY SCIENCE CLASS 10

CHEMISTRY SCIENCE CLASS 10

Assessment

Assessment

Created by

Bibhav Dwivedi

Chemistry

10th Grade

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60 questions

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1.

Multiple Choice

45 sec

1 pt

Which of the following is a chemical reaction?

Water freezes.

Sugar dissolves in water.

Salt and pepper are mixed in a dish.

Iron rusts.

2.

Multiple Choice

45 sec

1 pt

Before a chemical reaction, the total mass of two reactants is measured to be 40 grams.  After the reaction, what should be the total mass of the products?

0 grams

20 grams

40 grams

80 grams

3.

Multiple Choice

1 min

1 pt

Copper chloride and aluminum react to produce aluminum chloride and copper.  Which of the following is the correctly balanced chemical equation for this reaction?

CuCl2 + Al -> AlCl3 + Cu

3CuCl2 + Al -> AlCl3 + 2Cu

3CuCl2 + 2Al -> 2AlCl3 + 3Cu

CuCl2 + 3Al -> AlCl3 + 2Cu

4.

Multiple Choice

45 sec

1 pt

Which observation would most likely indicate that an exothermic reaction has occurred?

a color change

the production of gas bubbles

an increase in temperature

a decrease in temperature

5.

Multiple Choice

1 min

1 pt

The first part of a balanced chemical equation is shown:  H2SO4 + 2NaOH → ________.  In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products?

2

3

4

5

6.

Multiple Choice

1 min

1 pt

A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na → NaCl + H2The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced?

Na2Cl + H2

 2NaCl + H2

NaCl + 2H2

 2NaCl + 2H2

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