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WorksheetsChemical Formulas and Equations
Total questions: 16
Worksheet time: 18mins
Name
Class
Date
1.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
2.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
3.
Which of the following is NOT an element?
a)
H2O
b)
H2
c)
O2
d)
Au
4.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
5.
How many neutrons are contained in a neutral atom of:
a)
7
b)
14
c)
8
d)
9
6.
Is being able to be malleable physical or chemical
a)
physical
b)
chemical
c)
ducktile
d)
malleable
7.
A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?
a)
Nitrogen (N)
b)
Sulfur (S)
c)
Arsenic (As)
d)
Silicon (Si)
8.
A scientist spilled a few drops of dilute hydrochloric acid (HCl) on a lab table. For safety purposes, the scientist sprinkled some baking soda (NaHCO3) onto the spill. Which observation would provide the best evidence that a chemical reaction occurred?
a)
The baking soda and hydrochloric acid combined, and bubbles formed
b)
The baking soda absorbed the hydrochloric acid.
c)
Some of the baking soda dissolved in the hydrochloric acid
d)
The hydrochloric acid evaporated, leaving only the baking soda.
9.
*
a)
12CO2 + H20 --light--> C6H12O6 + O2
b)
CO2 + 9H20 --light--> C6H12O6 + O2
c)
CO2 + H20 --light--> 3C6H12O6 + O2
d)
6CO2 + 6H20 --light--> C6H12O6 + 6O2
10.
Hay is made up of organic compounds. What are the main elements in many organic compounds?
a)
Helium, Carbon, Sodium
b)
Sodium, Hydrogen, Nitrogen
c)
Carbon, Hydrogen, Oxygen
d)
Radon, Oxygen, Helium
11.
When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?
a)
The total number of neutrons in the unknown element
b)
The total number of particles in the nucleus of the unknown element
c)
The number of protons in the nucleus of the unknown element
d)
The number of valence electrons in the unknown element
12.
**
a)
1
b)
2
c)
3
d)
4
13.
**
a)
CO
b)
H2O
c)
CO2
d)
H2
14.
**
a)
one of the original compounds came out of solution
b)
the solutions reacted chemically
c)
some of the water froze into ice crystas
d)
rapid evaporation of water occurred, leaving a solid
15.
Which of these formulas contain equal numbers of nitrogen atoms?
a)
Formulas I and III
b)
Formulas I and IV
c)
Formulas II and III
d)
Formulas I, II, and V
16.
How many atoms are represented in the reactants of this equation?
a)
6
b)
12
c)
24
d)
36
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