Elements and Compounds and Properties and Changes

Question 1

Which of the following substances is a compound?

Accepted Answer

NH3

Question 2

What conclusion can be made after observing fizzing and bubbling?

Accepted Answer

A chemical reaction produced a gas.

Question 3

The chemical symbol for carbon is -

Accepted Answer

C

Question 4

Which of the following is a chemical property associated with wood?

Accepted Answer

ability to burn

Question 5

Which of the following is a compound?

Accepted Answer

CO

Question 6

The chemical symbol for oxygen is -

Accepted Answer

O

Question 7

The chemical symbol for hydrogen is -

Accepted Answer

H

Question 8

A chemical change is:

Accepted Answer

permanent.

Question 9

Which of the following statements are characteristics of an element?

Accepted Answer

II, III, IV

Question 10

Which of the following is not an element?

Accepted Answer

Water

Question 11

What do the letters Na and Cl represent in the chemical formula NaCl?

Accepted Answer

Elements

Question 12

Which of the following is the symbol for chlorine?

Accepted Answer

Cl

Question 13

Which of the following is a physical property?

Accepted Answer

Malleability

Question 14

Which of the following substances is an element?

Accepted Answer

Co

Question 15

The chemical symbol for nitrogen is —

Accepted Answer

N

Question 16

Which is the correct number of hydrogen and oxygen atoms present in the chemical formula H2O?

Accepted Answer

There are 2 hydrogen atoms for every 1 oxygen atom.

Question 17

Which is the best evidence that a change in chemical properties has taken place?

Accepted Answer

Color Change

Questions 17