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WorksheetsChemistry LT Practice
Total questions: 40
Worksheet time: 31mins
Name
Class
Date
1.
Isotopes are atoms that have the same number of ________ but differing number of __________
a)
protons, electrons
b)
neutrons, protons
c)
protons, neutrons
d)
electrons, protons
2.
The defining property of an atom is:
a)
The number of neutrons in the atom.
b)
The number of protons in the atom.
c)
The number of electrons in the atom.
d)
The number of positrons in the atom.
3.
Why is the relative atomic mass not a whole number?
a)
Nuclei can contain partial neutrons.
b)
Nuclei can contain varying number of electrons.
c)
Nuclei can contain partial protons.
d)
Nuclei can contain different numbers of neutrons and be the same element.
4.
The atomic number of Uranium is:
a)
110
b)
16
c)
53
d)
92
5.
The chemical symbol for Sulfur is:
a)
Su
b)
S
c)
Fr
d)
Sr
6.
Molecules are
a)
2 atoms bound together
b)
2 elements bound together
c)
2 or more atoms mixed together
d)
2 or more atoms bound together
7.
Which of the four following items are made up of one or more molecules?
a)
Gold
b)
Hydrogen
c)
Salt
d)
Neon
8.
What is a bond between two molecules?
a)
a chemical bond is an attraction or pull between atoms that holds them together.
b)
a chemical bond is a physical structure in an atom that connects it to other atoms.
c)
a chemical bond is a substance that is made up of matter that holds atoms together
d)
sticks
9.
What molecule is this?
a)
Carbon Dioxide
b)
Methane
c)
Water
d)
Sodium Chloride
10.
What molecule is this?
a)
Carbon Dioxide
b)
Methane
c)
Water
d)
Sodium Chloride
11.
What molecule is this?
a)
Carbon Dioxide
b)
Methane
c)
Water
d)
Sodium Chloride
12.
Matter is
a)
everything that has density
b)
everything made of atoms
c)
elements
d)
anything that has mass and takes up space
13.
Atoms make up
a)
Elements
b)
Molecules
c)
Compounds
d)
Protons Neutrons and Electrons
14.
The smallest part of an element is
a)
proton
b)
atom
c)
compound
d)
mixture
15.
H2O2← ?
This number tells the number of atoms present.
This number tells the number of atoms present.
a)
coefficient
b)
molecule
c)
subscript
d)
atom
16.
→2H2O
This number tells how many molecules are in a chemical equation.
This number tells how many molecules are in a chemical equation.
a)
coefficient
b)
subscript
c)
compound
d)
element
17.
2H2O
How many H2O molecules are present?
How many H2O molecules are present?
a)
1
b)
4
c)
2
d)
8
18.
What are the basic building blocks for all matter?
a)
atoms
b)
elements
c)
compounds
d)
chemicals
19.
2H2O
How many Hydrogen atoms are present?
How many Hydrogen atoms are present?
a)
2
b)
4
c)
1
d)
10
20.
2H2O
How many Oxygen atoms are present?
How many Oxygen atoms are present?
a)
2
b)
4
c)
1
d)
5
21.
The Atomic Number is the same as the number of:
a)
protons
b)
electrons
c)
protons and neutrons
d)
electron shells
22.
Why can you not see molecules with the naked eye?
a)
They have no mass.
b)
They are magic.
c)
They don't really exist.
d)
They are too small.
23.
Which particle does not contribute mass to the atom?
a)
Proton
b)
Neutron
c)
Electron
d)
Nucleus
24.
How many protons are in this element?
a)
79
b)
196
c)
117
d)
Cannot be determined
25.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
26.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
27.
Element or compound?
H2O
H2O
a)
element
b)
compound
28.
Element or compound?
O2
O2
a)
Element
b)
Compound
29.
In this image, what are the symbols in red are called the_______.
a)
Products
b)
Reactants
c)
Subscripts
d)
Coefficients
30.
In this image, the symbols to the right of the arrow (in black) are called the_______.
a)
Products
b)
Reactants
c)
Subscripts
d)
Coefficients
31.
Na + MgF2 --> NaF + Mg
What are the reactants?
What are the reactants?
a)
Na + MgF2
b)
Na
c)
NaF + Mg
d)
NaF
32.
NH3 ---> N2 + H2
What are the products?
What are the products?
a)
N2 + H2
b)
N2
c)
H2
d)
NH3
33.
The arrow symbol used in a chemical equation
a)
Yield sign
b)
Subscript
c)
Coefficient
d)
Chemical formula
34.
How many bonds are shown in this structural formula of carbon dioxide?
a)
1
b)
2
c)
3
d)
4
35.
The force of attraction that holds atoms or ions together
a)
covalent compound
b)
chemical bond
c)
ionic compound
d)
valence electron
36.
How many atoms of Hydrogen are in this compound
a)
1
b)
2
c)
3
d)
4
37.
How many elements are in the this compound?
H2CO4N5
H2CO4N5
a)
11
b)
4
c)
12
d)
5
38.
How many elements are present in this compound?
Mg2As3COHNi2
Mg2As3COHNi2
a)
2
b)
4
c)
6
d)
10
39.
Are the compounds shown isomers
a)
No
b)
Yes
40.
3. Below is a photograph of carbon. What particle is the smallest unit of carbon that still has the chemical properties of this element? (7-5.1)
a)
Atom
b)
Water
c)
Mixture
d)
Compound
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