NEW
Font size
WorksheetsIntro to Chemistry Practice
Total questions: 20
Worksheet time: 11mins
The reaction Cl2(g) + 2KBr(aq) -> 2KCl(aq) + Br2(l) is a(n)
synthesis reaction
decomposition reaction
single-replacement reaction
double-replacement reaction
The reaction Pb(NO3)2(aq) + 2KI(aq) -> PbI2(s) + 2KNO3(aq) is a
synthesis reaction
combustion reaction
single-replacement reaction
double-replacement reaction
Which statement describes a chemical property of aluminum?
Aluminum is malleable
Aluminum has a high density
Aluminum reacts with sulfuric acid
Aluminum conducts an electric current
The formation of water from oxygen and hydrogen can be described in the following word equation:
oxygen gas+ hydrogen gas → liquid water
product
reactant
waste
only a compound
When investigating a chemical reaction, one would expect the products to have
The same properties as the reactants have separately
a mixture of the properties of the reactants
different properties than the reactants have separately
the same properties as only one of the reactants
The data from an investigation on the reaction of sodium and chlorine is shown in the table above. The data in the table gives evidence to support the fact that
compounds have different properties than the elements that make them up
crystals are formed whenever solids react with gases
once a compound is formed it cannot be chemically separated into the elements from which it is made.
chlorine has a higher melting point than sodium
The chemical word equation for the process of photosynthesis is:carbon dioxide + water → glucose + oxygen
The reactant(s) for the process of photosynthesis
are glucose and oxygen
is glucose only
is water only
are water and carbon dioxide
Which of the following is a physical property of water?
It reacts with calcuim metal to produce a basic solution
It can be decomposed by electrolysis
It forms a new compound when reacted with Magnesium
It melts below room temperature
Which action represents a chemical change?
melting gold
running an electrical current through copper wire
iron rusting in the course of time
breaking an ice cube into smaller pieces
Some properties are the same in a substance no matter the amount of the substance. Which of the following characteristics does not change based on the amount of the substance?
Mass
Volume
Density
Weight
Which of the following is the best evidence for a chemical change.
bubbles are given off
a precipitate is formed
the formation of a new substance
all the choices
. In the food industry, manufacturers turn vegetable oil into margarine through the process of hydrogenation. This chemical reaction occurs at the fastest rate and with the lowest activation energy when
a nickel catalyst is used
more reactant is added to the reaction
As collisions increase between reactants, the rate of reaction also increases. Which of the following does not cause an increase in collisions between reactants?
increase in temperature
decrease in surface area
increase in pressure
addition of a catalyst
Which of the following is a chemical change?
mixing
melting
rusting
grinding
During a chemical reaction in which a catalyst has been added, the amount of the catalyst
increases
decreases
does not change
fluctuates
For a reaction such as: Na + 2H2O → Na(OH)2 + H2
At which temperature will the rate of the reaction be the fastest ?
40 degree C
60 degree C
20 degree C
0 degree C
Why does increasing the concentration of reactants increase the reaction rate?
Increasing the concentration of the reactants causes the reacting particles to have more energy.
Increasing the concentration of the reactants causes the temperature to increase
Packing more particles into a fixed volume increases the frequency of collisions
Packing more particles into a fixed volume decreases the energy of the particles
Which of the following pH values indicates the highest concentration of hydronium ions in a solution?
pH = 1
pH = 2
pH = 12
pH = 7
A student adds a small amount of acid to a buffer solution that has a pH of 9.5. Which of the following happens?
The acid shows an increase in pH from 9.5
The pH of the solution falls as a constant rate until it reaches 4.5
The pH of the solution remains about 9.5
The solution rapidly becomes neutral
Most enzymes in living organisms function optimally in neutral pH surroundings, which have a pH level
less than 7
More than 7
near 7
near 1
Near 14
