WorksheetsIPC - Chemical Reactions
Total questions: 20
Worksheet time: 2hrs 40mins
Which of the following equations demonstrates the law of conservation of mass?
Chemical reactions that demonstrate the law of conservation of mass...
are balanced.
have equal amounts of atoms in the products as the reactants.
have not created nor destroyed matter.
are unbalanced.
Does this reaction demonstrate the law of conservation of mass?
Yes, because the amount of atoms are equal in the reactants and products.
No, because there are unequal amounts of atoms in the reactants and the products.
No, because the reactant and product model diagrams do not match.
Yes, because the amount of atoms are unequal in the reactants and products.
Which set of coefficient values balances the chemical reaction between magnesium and oxygen gas?
2, 1, 2
1, 1, 2
2, 2, 2
2, 2, 1
Which of the following sets of coefficients balances this chemical reaction?
1, 2, 1, 3
3, 2, 1, 3
3, 1, 1, 3
2, 1, 1, 3
What type of chemical reaction absorbs heat from the surrounding environment?
exothermic
heterothermic
endothermic
homothermic
What type of chemical reaction releases heat into the surrounding environment?
exothermic
heterothermic
endothermic
homothermic
Which of the following is an example of an exothermic reaction? (Select all that apply)
glow stick
cold pack
hot hands
cooking an egg
Which of the following is an example of an endothermic reaction? (select all that apply)
boiling water in a pot
glow stick
cold pack
burning campfire
The part of the atom that is responsible for bonding atoms is --
protons
neutrons
valence electrons
nucleus
Which of the following are evidences of a chemical change? (Select all that apply)
production of light
gas bubbles
temperature change
color change
All of the listed are evidence of a chemical reaction except--
II and IV
I and II
I and III
I and V
What happens to the atoms of the reactants in a chemical reaction?
They recombine to form the products.
They change into new atoms.
They change names.
Some are lost to the environment.
Which statement below best explains why sodium and chlorine easily react with one another?
Sodium only has one valence electron, and chlorine has seven.
Sodium has a lower atomic mass than chlorine.
Chlorine has more electrons than sodium.
Sodium has an empty valence shell, where chlorine has a full one.
The process by which one or more substances are changed into one or more new substances is called a --
chemical change
chemical reaction
both are correct
This is a number placed in front of a chemical formula that shows how many molecules there are
subscript
exponent
coefficient
Which of the following statements is true?
Atoms are neither created nor destroyed during a chemical reaction.
Chemical reactions always require heat to begin.
All chemical reactions produce heat.
Which of the following statements is false?
Energy is needed to break bonds during a chemical reaction.
A catalyst is something that speeds up a chemical reaction.
Products results from matter being created.
These are always found on the right of the arrow in a chemical equation
reactants
products
coefficients
subscripts
These are always found on the left of the arrow in a chemical equation
reactants
products
coefficients
subscripts
