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WorksheetsElements, Molecules and Compounds part 2
Total questions: 27
Worksheet time: 14mins
How many different elements are in this chemical formula: C2H2ClK3
2
4
6
8
Which of the following atomic symbols is written correctly?
cL
Cl
CL
cl
Which of the following is a pure substance?
CO
C02
Co
H2O
which of the following is a pure substance
O2
Al2CO5
C6H12O6
SiO2
Which of the following atomic symbols for bromine is written correctly?
bR
BR
Br
br
Which of the following chemical formulas represents a compound?
C3
O2
CH3CHO
H2
one of the elements of the periodic table is sodium what is its basic properties
It is a pale yellow, white or colourless gas which can sometimes be fluorescent. It can be found in volcanic gases and thermal waters.
a solid. It exists as a dark brown to black amorphous powder or as an extremely hard, jet-black to silver-gray, brittle, lustrous, metal-like element.
It is a silvery-white, ductile metallic element, the most abundant in the earth's crust but found only in combination, chiefly in bauxite. Having good conductive and thermal properties,
It is a soft, light, extremely malleable silver-white metallic element that reacts explosively with water, is naturally abundant in combined forms, especially in common salt,
What is sugar?
element
compound
mixture
too many calories
When two or more different elements chemically combine
element
compound
mixture
solution
Which item on this element square is the chemical symbol?
Copper
29
Cu
63.546
one element on the periodic table is chlorine, what is the basic property of this element
It is soft and dull grey or black in color, a solid at room temperature
It is a light, silvery-white, moderately hard metallic element that in ribbon or powder form burns with a brilliant white flame.
It is a yellow-green poisonous gas at room temperature
it is generally inert, nonmetallic, colorless, odorless and tasteless.
What is the most abundant element found in the earth's atmosphere?
Oxygen
Sulfur
Nitrogen
Argon
This table represents the elemental composition of the _____
Atmosphere
Ocean
Life on Earth
Crust
What compound is also known as table salt?
Cl2Na
NaCl2
ClNa
NaCl
What is the compound name for NaCl?
Table Salt
Sodium Chloride
Sodium Chlorite
Sodium Chlorate
The toxic gas known as Carbon Monoxide would be written as..
CO2
H2O2
CO
C6H12O6
What is CO2?
Carbon Monoxide
Cobalt Dioxide
Carbon Dioxide
Carbon Trioxide
What is Hydrogen Peroxide?
H2O2
H2O
HO2
H1O1
What is CaCO3?
Calcium Carbon Dioxide
Carbon Calciumate
Calcium Carbonate
Calcium Carbonite
an atom with atomic number 6 would have how many protons
3
6
12
cannot be determined
Carbon is considered an element while carbon dioxide is considered a compound. This is because carbon dioxide is
a gas at room temperature.
made of two different elements.
given off by green plants.
useful to human beings.
How many protons does this atom have?
2.5
6
5
10.811
If the number of protons equal the number of _____, the atom will have no charge
protons
neutrons
electrons
nucleus
The first energy level can hold up to how many electrons?
2
4
5
8
What is the atomic mass of "F"
9
17
18
19
The atomic number of an element is the total number of which particles in the nucleus?
neutrons
protons
electrons
protons and electrons
How many neutron are in the atom "K"?
8
10
19
39
