WorksheetsET 9/5 & 9/8
Total questions: 10
Worksheet time: 30mins
Name
Class
Date
1.
Which element is a metalloid?
a)
Titanium
b)
Selenium
c)
Potassium
d)
Polonium
2.
John was observing the physical properties of elements in order to classify them as either a metal, nonmetal, or metalloid. The first element was dull, brittle, and did not conduct heat. What would its classification be?
a)
metal
b)
nonmetal
c)
metalloid
3.
How many different elements are present in H2COCH2
a)
5
b)
4
c)
3
d)
2
4.
4CF2Cl2
a)
C = 4, F = 4, Cl = 2
b)
C = 1, F = 8, Cl = 8
c)
C = 4, F = 8, Cl = 8
d)
C = 1, F = 4, Cl = 8
5.
Chemical reactions
a)
create and destoy atoms
b)
only occurs outside living organisms
c)
occurs only in living organisms
d)
produce new substances
6.
What is underlined in the chemical equation below?
Na + Cl ---> NaCl
a)
Products
b)
Reactants
7.
What are the reactants of this equation?
a)
CH4 + 2O2
b)
CO2+ 2H2O
8.
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
9.
For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.
The student inferred that a chemical reaction occurred. What evidence supports this inference?
The student inferred that a chemical reaction occurred. What evidence supports this inference?
a)
A dark solid formed on the zinc metal.
b)
The zinc metal remained silver-colored and shiny
The zinc metal remained silver-colored and shiny
c)
The CuSO4 solution turned blue when the zinc metal was added.
d)
None of these
10.
Which of the following is NOT evidence that that a chemical reaction has occurred?
a)
produces light/heat
b)
production of a gas
c)
formation of a precipitate
d)
melting
100 %
