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WorksheetsHomework 20 - Chemical Reactions - Due 04/10
Total questions: 15
Worksheet time: 31mins
The Law of Conservation of Mass says that matter cannot be ________ or __________.
Divided or Multiplied
Balanced or Unbalanced
Increased or Decreased
Created or Destroyed
Which of the following can by possible physical indicators of a chemical reaction?
Formation of Gas
Change in Color
Emission of Light
Sublimation of Solids
Deposition of Gases
Reactants are the chemicals that are present at the beginning of an experiment. Reactants react together to make the product.
We can know that a chemical reaction is occurring when we see ______.
that the product looks just like the reactants.
nothing new.
that the product looks different from the reactants.
Which of the following is evidence of a chemical reaction?
Tearing paper.
Change in color.
Production of a gas.
Change in temperature.
Production of a precipitate.
How many Carbons are present on the reactant side?
1
2
3
4
Why are chemical equations always balanced? Select ALL that apply.
Matter cannot be created.
Matter cannot be destroyed.
Matter can only be rearranged/conserved.
Matter doesn't matter.
How many Hydrogens are on the product side of this chemical equation?
1
2
3
4
What does it mean for a reaction to be endothermic? Choose 2 of the following.
When two substances react, the temperature of the mixture decreases.
When two substances react, the temperature of the mixture increases.
There is less energy going into the reactant to break the bond than there is energy leaving the product.
There is more energy going into the reactant to break the bond than there is energy leaving the product.
The amount of energy entering and leaving is the same.
What does it mean for a reaction to be exothermic? Choose 2 of the following.
When two substances react, the temperature of the mixture decreases.
When two substances react, the temperature of the mixture increases.
There is less energy going into the reactant to break the bond than there is energy leaving the product.
There is more energy going into the reactant to break the bond than there is energy leaving the product.
The amount of energy entering and leaving is the same.
Look at the chemical equation.
How many atoms of mercury (Hg) are in the reactants?
(a)
Look at the chemical equation.
How many atoms of nitrogen (N) are in the products?
(a)
The reactants in the image above are:
CH4 and 2 O2
2 H2O and CO2
All of these are reactants
All of these are products
