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WorksheetsChemistry Counting Atoms
Total questions: 20
Worksheet time: 10mins
A subscript is the small number below a(n) ________ that tells the number of _______ of that element.
element symbol; atoms
atom; element symbol
subscript; protons
compound; elements
If there is no subscript, there is ______ atom(s) of that element
0
1
2
10
How many atoms are in the element Carbon in this compound?
H2C3O4N5
2
4
5
3
How many TOTAL atoms are in this compound?
H2C3O4N5
14
15
5
19
Which of these is NOT a compound?
OH
H2Cr
PNi
Cr3
Element or compound?
O2
Compound
Element
Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)
H3SO4
HSO4
H4S3O
H2O
The substances at the beginning of a chemical equation are called the ____
product
yield
reactants
chemical symbol
What is a chemical equation?
A short way to show a chemical reaction using symbols
A way to explain a chemical reaction using words
Name ALL the evidences that show a chemical reaction has occurred.
light, precipitate, odor,
temperature, smell, light, conductivity, taste
color, gas, light
color, gas, light, temperature, precipitate
How many atoms are there in total? 5 Ca(OH)2
5
10
25
15
3Cr(MnO4)6 - how many Cr?
1
18
9
3
How many elements are in this equation: NaCl
1
4
3
2
How many total atoms are in H20
1
3
2
4
How many molecules are in 2Mg(SO3)2
0
2
1
3
what is the five in this equation 5Cu(NO3)2
Coefficient
Subscript
Atom
Which of the following is a compound?
C
Co
CO2
O2
The blue numbers in the image below represent
none of the answers are correct
coefficients
Subscripts
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
Mg and O
MgO
Mg and MgO
O and MgO
5CO2
How many molecules are there? How many elements?
2 elements, 5 molecules
15 elements, 2 molecules
5 molecules, 2 elements
10 atoms, 5 elements
