Question 1

Elements are pure substances made of one kind of atom, represented by a chemical symbol .  Which  example best represents the following statement?

Accepted Answer

$O$

Answer

$NaCl$

Answer

$H_{2}O$

Answer

$CO$

Question 2

A compound is a pure substance with two or more different atoms chemically combined.  Which example best represents the above statement?

Accepted Answer

$CO$

Answer

$Co$

Answer

$03$

Answer

Helium

Question 3

Which symbol correctly represents Gold as a pure substance?

Accepted Answer

$Au$

Answer

$Ag$

Answer

$Ge$

Answer

$AU$

Question 4

Which diagram above best represents a substance  that contains one type of atom?

Accepted Answer

I, III

Answer

III only

Answer

II, III

Answer

II and IV

Question 5

What is the best conclusion regarding items II and IV?

Accepted Answer

Both are two or more  different elements chemically combined.

Answer

Items II is a compound and  IV is an element

Answer

Items IV contain  more atoms than Item II.

Answer

Both are one kind of atom chemically combined.

Question 6

Which example is not related to a pure substance with two or more different kinds of atoms?      
I - $CO_2$     
II - $H_{2}O$
III - $CH_4$ (methane gas)
IV- $O_2$ (oxygen gas)

Accepted Answer

IV

Answer

I, IV

Answer

II only

Answer

I, III

Question 7

In the chemical formula $CHOOH$,  how many different elements are  present?

Accepted Answer

3

Answer

1

Answer

2

Answer

5

Question 8

Which chemical formula would contain  the element Lithium?

Accepted Answer

$LiF$

Answer

$Al$

Answer

$Ni$

Answer

$C_{6}H_{12}O_{8}$

Question 9

How are the following  substances similar?

Accepted Answer

Substance A  has the same elements as Substance B.

Answer

Substance B  has same total atoms as  Substance A.

Answer

None of the above is true.

Answer

Substance A has the same amount of oxygen as Substance B.

Question 10

How is  substance B  different from Substance A?

Accepted Answer

Substance B has  one more atom of oxygen than  substance A.

Answer

Substance A has more total atoms.

Answer

None of the above is correct.

Answer

Substance B has different elements.

Question 11

True or false: If the substances on the LEFT side of the arrow are the reactants , then the reactants contain 2 pure substances , 1 compound, and  0 elements.

Accepted Answer

False

Answer

True

Question 12

True or False: If the substances on the RIGHT side of the arrow are the products, then the products contain  2 pure substances and 2 compounds

Accepted Answer

True

Answer

False

Question 13

Which is the BEST example of a pure substance?

Accepted Answer

gold

Answer

milk

Answer

peanuts

Answer

air

Related quizzes

Related quizzes