WorksheetsPS CFA4 - Reactions RTI
Total questions: 10
Worksheet time: 25mins
A balanced equation demonstrates...
The law of conservation of mass
The law of conservation of energy
There was an exothermic reaction
Matter can be created and destroyed in a chemical reaction.
There are 5 grams of carbon on the reactant side of a chemical equation,.
How many grams of carbon will be on the product side of the equation?
(a)
The modeled chemical equation is:
Balanced, there are two elements on each side
Unbalanced, there are too many atoms in the products
Unbalanced, there are too many atoms in the reactants
Balanced, there are two molecules on each side
Which set of products would make a balanced equation with the reactants shown?
How many Oxygen (red) atoms are missing from the products of this equation?
0
1
2
3
Chemical equations must be balanced because...
energy has been created and destroyed
the law of concentration of energy
there was an exothermic reaction
matter cannot be created or destroyed
Will the mass of the sealed jar and its contents change or stay the same as the candle burns out?
CHANGE
The mass will increase as smoke is made
CHANGE
The mass will decrease as the candle burns and gets smaller.
STAY THE SAME
The mass will not change. It is a closed system and nothing can enter or exit the jar.
How do chemical reactions form new substances?
the elements break apart into protons, neutrons, and electrons
the atoms mix together and create new elements
the molecules break apart and new bonds form making new molecules
the compounds mix in water to form solutions
What happens to atoms in a chemical reaction?
atoms are removed to form new substances
atoms are rearranged to form new substances
atoms changed shape to form the same substances
atoms were added to form more of the same substances
