Quiz about Chemical Equations TEST

Question 1

All of these are example of elements except-

Accepted Answer

<math><semantics><mrow><mi>K</mi><mi>I</mi></mrow><annotation encoding="application/x-tex">KI</annotation></semantics></math>KI

Answer

<math><semantics><mrow><mi>C</mi><mi>u</mi></mrow><annotation encoding="application/x-tex">Cu</annotation></semantics></math>Cu

Answer

<math><semantics><mrow><mi>H</mi><mi>e</mi></mrow><annotation encoding="application/x-tex">He</annotation></semantics></math>He

Answer

<math><semantics><mrow><mi>H</mi></mrow><annotation encoding="application/x-tex">H</annotation></semantics></math>H

Question 2

A chemical formula shows all of the following except-

Accepted Answer

the number of protons in a nucleus

Answer

the number of atoms of each element

Answer

the chemical symbols of elements

Answer

the elements found in a compound

Question 3

What is the appropriate subscript for oxygen in the models shown?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 4

In this reaction, what are the reactants?

Accepted Answer

Sodium and chlorine

Answer

Sodium, carbon, and Iodine

Answer

Sodium chloride

Answer

Sodium, chlorine, and sodium chloride

Question 5

In the previous reaction, what is the product?

( 2Na + Cl₂ --> 2NaCl)

Accepted Answer

$$NaCl$$

Answer

$$Na,C\ and\ I$$

Answer

$$Na,\ Cl$$

Answer

$$Na,\ Cl,\ and\ NaCl$$

Question 6

Which of the following is an example of a chemical change?

Accepted Answer

combining baking soda and vinegar

Answer

water evaporating

Answer

tearing paper into smaller pieces

Answer

mixing water and sugar

Question 7

All of the following are indicators of a chemical change except-

Accepted Answer

change in state of matter

Answer

formation of a gas

Answer

change in temperature

Answer

formation of a precipitate

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