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WorksheetsUnit 3.3 Review - Chemical Formulas and Equations
Total questions: 18
Worksheet time: 14mins
How many oxygen (O) atoms are found in one molecule of Fe(OH)2?
0
1
2
4
How many total atoms are found on the product side of the equation below?
1
2
3
9
Which of the following are NOT signs that a chemical reaction occurred?
1. precipitant
2. unexpected temperature change
3. phase change
4. unexpected color change
5. change in appearance
6. production of gas
7. odor
1 and 6
3 and 5
2 and 5
all are signs of a chemical change
The reaction above shows that _____ .
the atoms on the left are changed into different atoms on the right
the atoms on the left form new elements
the number of atoms on the left equal the number of atoms on the right
the compounds on the left are produced from the atoms on the right
Which of the following statements explains what is happening in the equation above?
CH4 is reacting with CO2 to form H2O and O2
CH4 is reacting with O2 to form CO2 and H2O
CO2 and H2O are reacting to form CH4 and O2
What information can you determine from looking at the chemical formula of a substance?
the number of atoms of each element
the state of the substance
the color of the substance
the number of molecules in the sample
What is the possible chemical formula for this compound?
3 H 1 CCl
CCl3H
H3 1 CaCl
CH3Cl
If I started with 15 g of CH4 and 3 g of O2, what is the total mass of CO2 and H2O that are produced?
3 g
9 g
15 g
18 g
Which of the following is an example of a physical change?
teeth grinding food
saliva breaking down carbohydrates
stomach enzymes breaking down proteins
Which of the following is an example of a chemical change?
teeth cutting pizza into smaller pieces
teeth grinding pizza into even smaller pieces
saliva breaking down the crust into simple sugars
Which compound has three hydrogen atoms?
Na3PO4
H3PO4
3 H2O
2 MgO
What is the possible chemical formula for this compound?
2 C3H4
CH3C2H2C2H3
C5H8
C4H6
How many atoms of lead (Pb) are found in one molecule of Pb2(CO3)3?
(a)
How many atoms of carbon (C) are found in one molecule of Pb2(CO3)3?
(a)
How many atoms of oxygen (O) are found in one molecule of Pb2(CO3)3?
(a)
How many total atoms are found in one molecule of Pb2(CO3)3?
(a)
How many elements are found in one molecule of Pb2(CO3)3?
(a)
How many hydrogen atoms are found on the product side of this reaction?
2
6
12
18
