Quiz about Elements, Compounds & Counting Atoms

Question 1

Which element has the greatest number of atoms? $$AgNO_3$$

Accepted Answer

Oxygen (O)

Answer

Silver (Ag)

Answer

Nitrogen (N)

Answer

Equal in number (3)

Question 2

Which chemical formula has 21 atoms.

Accepted Answer

C₉H₈O₄

Answer

H2SO4

Answer

CH₃COCH₃

Answer

H2SO3

Question 3

Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)

Accepted Answer

H3SO4

Answer

HSO4

Answer

H4S3O

Answer

H2O

Question 4

Which chemical formula correctly displays 1 atom of nickel and 2 atoms of Fluorine?

Accepted Answer

NiF2

Answer

Ni2F

Answer

Ni2F1

Answer

Ni1F2

Question 5

NaCl is the chemical formula for salt. Is NaCl considered a compound or an element?

Accepted Answer

compound

Answer

element

Answer

both

Answer

neither

Question 6

We breathe oxygen. Its chemical formula is O_2. Is this formula an element or a compound?

Accepted Answer

element

Answer

compound

Answer

neither

Answer

both

Question 7

C₃H₅(NO₃)₃

Accepted Answer

C = 3, H = 5, N = 3, O = 9

Answer

C = 3, H = 5, N = 1, O = 9

Answer

C = 9, H = 15, N = 3, O = 9

Answer

C = 9, H = 15, N = 1, O = 3

Question 8

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

Accepted Answer

H2SO4

Answer

H3PO4

Answer

HCIO3

Answer

H20

Question 9

Pure Substance

Accepted Answer

Both Element and Compound

Answer

Element

Answer

Compound

Question 10

Represented by a chemical symbol

Accepted Answer

Element

Answer

Compound

Answer

Both Element and Compound

Question 11

Represented by a chemical formula

Accepted Answer

Compound

Answer

Element

Answer

Both Element and Compound

Question 12

made of atoms

Accepted Answer

Both Element and Compound

Answer

Element

Answer

Compound

Question 13

Made of 2 or more elements

Accepted Answer

Compound

Answer

Element

Answer

Both Element and Compound

Question 14

H2O

Accepted Answer

compound

Answer

element

Question 15

CO2

Accepted Answer

compound

Answer

element

Question 16

F2

Accepted Answer

element

Answer

compound

Question 17

N2

Accepted Answer

element

Answer

compound

Question 18

CH4

Accepted Answer

compound

Answer

element

Question 19

Al

Accepted Answer

element

Answer

compound

Question 20

Cl

Accepted Answer

element

Answer

compound

Question 21

Fe

Accepted Answer

element

Answer

compound

Question 22

Sr

Accepted Answer

element

Answer

compound

Question 23

LiF

Accepted Answer

compound

Answer

element

Question 24

CO

Accepted Answer

compound

Answer

element

Elements, Compounds & Counting Atoms

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