Font size
Worksheetssimple chemical reactions
Total questions: 38
Worksheet time: 19mins
Which of the following models best demonstrates a balanced chemical equation?
F
G
H
J
Balance this equation:
2Li + Cl2 -> LiCl
2Li + Cl2 -> 4LiCl2
2Li + Cl2 -> LiCl2
2Li + Cl2 -> 2LiCl
the starting materials in a chemical reaction
Products
Reactants
Starters
Enders
a substance that is formed as the result of a chemical reaction
Product
Reactant
Starters
Enders
Which of the following examples shows that a chemical reaction has occurred?
A rock breaks into smaller pieces when it is struck with a hammer.
Rust forms on a hammer that has been left outside to long.
A cup of water turns pink when a few drops of red food coloring are added.
A solid is formed when heat is removed from a sample of water.
A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles -
could show that a gas is forming
always rise to the top of a liquid.
are almost always perfectly spherical.
usually burst after a few minutes.
Which of the following is an example that includes evidence of a chemical reaction?
A sample of zinc is placed in water and it settles to the bottom
A solid block of ice is heated and it completely melts into a liquid.
Sugar that is burned gives off an odor and turns brown and then black.
A tomato is placed into a blender and chopped up into smaller pieces.
Evidence of a chemical reactions is anything that shows -
a new substance has formed
a solid dissolved in a liquid
interaction between 2 gases
a change in the state of matter
What is the product formed when sodium reacts with chlorine gas?
Sodium chloride
Sodium chlorate
Sodium chlorite
Sodium hypochlorite
Which of the following observations indicates a chemical reaction has occurred?
A piece of metal is cut into smaller pieces.
A liquid evaporates into a gas.
A solid precipitate forms in a solution.
A gas is compressed into a smaller volume.
Which of the following is a sign that a chemical reaction has taken place?
A color change occurs.
A liquid is poured into another liquid.
A solid is cut into smaller pieces.
A gas is heated.
What is the balanced equation for the reaction of hydrogen and oxygen to form water?
H2 + O2 -> H2O
2H2 + O2 -> H2O
2H2 + O2 -> 2H2O
H2 + 2O2 -> H2O
What is an indicator that a gas has been produced during a chemical reaction?
Formation of a solid precipitate.
Change in temperature of the solution.
Presence of bubbles in the reaction mixture.
Color change of the reactants.
What is the result of the reaction between vinegar and baking soda?
Change in color of the solution.
Production of water and salt.
Release of carbon dioxide gas.
Formation of sodium acetate.
Acids taste _________________.
Sour
Spicy
Bitter
Sweet
Which substance is acid?
Ammonia
Toothpaste
Vinegar
Soap
Alkalis feel...
Rough
Soapy
Granulated
Smooth
Which of the following acids do we have in our stomach?
Ethanoic acid
Hydrochloric acid
Nitric acid
Sulphuric acid
What does this warning symbol mean?
Toxic
Corrosive
Flammable
Irritant
Which elements are in this formula?
(click all that apply)
Nitrogen (N)
Sodium (Na)
Oxygen (O)
Hydrogen (H)
Which is an example of a chemical change?
(click all that apply)
Burning wood
Rust on a car
Cooking food
Frozen Water
Production of Gas or Bubbles is evidence of a
Physical Change
Chemical Change
A mixture is made of at least how many different types of atoms/molecules?
2
1
4
7
You have a large glass of water and you stir salt into it until all the salt completely dissolves. This means the salt is _______ .
soluble
not soluble
What evidence in the image shows that a chemical reaction has occurred?
surprised face
blue liquid
new gas and bubbles
orange t-shirt`
This is an example of a ______ molecule.
simple
complex
The green liquid is a ________ in this chemical reaction.
reactant
product
The blue liquid is a ________ in this chemical reaction.
reactant
product
What state is oxygen?
solid
liquid
gas
How many atoms are in S8?
1
8
16
2
I don't know
How many atoms of carbon are in CO2?
1
2
3
4
I don't know
How many atoms of carbon are in C3H8?
1
3
8
11
I don't know
How many atoms of carbon are in 2C2H6?
1
2
4
6
12
How many atoms of carbon are in 3C3H8?
3
8
9
14
24
How many atoms of carbon are in 3Al2(CO3)3?
1
3
6
7
9
How many atoms of carbon are in 3Mg(C2H3O2)2?
2
4
6
7
12
2Li + Cl2 -> LiCl
