BARU
Ukuran huruf
S
M
L
XL
Lembar kerjaChemical Equations1
Total soal: 25
Worksheet time: 31mins
Nama
Kelas
Tanggal
1.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
2.
The law of conservation of matter states that
a)
chemical reactions change matter.
b)
in chemical reactions, the identity of reactants and products is conserved.
c)
atoms are neither created nor destroyed in chemical reactions.
d)
a chemical equation must be balanced.
3.
Use this equation:
4H + O2 --> 2H2O
How many atoms of hydrogen are on each side of the arrow?
4H + O2 --> 2H2O
How many atoms of hydrogen are on each side of the arrow?
a)
4
b)
2
c)
8
d)
1
4.
When a solid forms from a chemical reaction, the solid is called a ____________.
a)
precipitation
b)
result
c)
product
d)
precipitate
5.
In a chemical reaction, everything to the left of the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
6.
In this image, the symbols to the right of the arrow (in black) are called the_______.
a)
Products
b)
Reactants
c)
Subscripts
d)
Coefficients
7.
Read the following chemical formula: C6H12O6. How many hydrogen atoms are in the formula?
a)
12
b)
6
c)
4
8.
This is used to represent the amount of each atom in a molecule. What is the arrow pointing to?
a)
Exponent
b)
Coefficient
c)
Molecule
d)
Subscript
9.
This appears on the left side of a chemical formula, and represents how many molecules there are.... What is highlighted in yellow?
a)
Atom
b)
Subscript
c)
Molecule
d)
Coefficient
10.
How many oxygen atoms are in this chemical formula?
a)
6 oxygen atoms
b)
2 oxygen atoms
c)
3 oxygen atoms
d)
4 oxygen atoms
11.
A molecule is smaller than an atom.
a)
True
b)
False
12.
A tomato chopped up to make salsa?
a)
Physical Change
b)
Chemical Change
13.
Leaves changing colors?
a)
Physical Change
b)
Chemical Change
14.
Exploding Fireworks?
a)
Physical Change
b)
Chemical Change
15.
Marco tears a piece of notebook paper into smaller pieces, as shown below.
Tearing paper into pieces is an example of what kind of change?
Tearing paper into pieces is an example of what kind of change?
a)
A. a change in mass
b)
B. a physical change
c)
C. a chemical change
d)
D. a change in energy
16.
Freezing Juice?
a)
Physical Change
b)
Chemical Change
17.
Is bleaching your hair a physical or chemical change?
a)
physical
b)
chemical
18.
In chemical reactions, the law of conservation of mass is......
a)
disobeyed
b)
not true
c)
obeyed
d)
used sometime
19.
Which statement is not a description of a chemical reaction?
a)
A solid is dropped into a beaker of liquid and a gas is released.
b)
Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
c)
A solid is dropped into a beaker of liquid and an explosion occurs.
d)
A liquid is heated on a hot plate and its temperature rises.
20.
True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed.
In a chemical reaction, no new atoms are created, and no atoms are destroyed.
a)
true
b)
false
21.
Predict the products for the this Double-replacement reaction:
AgNO3 + KCl -->
AgNO3 + KCl -->
a)
AgCl + KNO3
b)
AgK + ClNO3
c)
AgNO3 + KCl
d)
KAg + NO3Cl
22.
Predict the products for the this single-replacement reaction:
Mg + CuCl2 -->
Mg + CuCl2 -->
a)
MgCl2 + Cu
b)
MgCl + Cu
c)
MgCu + Cl2
d)
CuMg + Cl2
23.
Predict the products for the this single-replacement reaction:
K + HCl -->
K + HCl -->
a)
KCl + H2
b)
KHCl
c)
KH + Cl2
d)
KCl + H
24.
Predict the products for the decomposition of calcium carbonate: CaCO3
a)
CaO + CO2
b)
Ca + CO3
c)
CaCO2 + O2
d)
CaO + CO3
25.
This pictures simulates what type of reaction?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
Setel ulang
