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WorksheetsUnit 1: Chemistry of Life
Total questions: 47
Worksheet time: 47mins
What is the first step in the scientific method?
draw conclusions
ask a question/make an observation
make a hypothesis
test the experiment
To make observations you use your _______.
senses
feet
smile
experience
Performing a test or experiment allows you to test your ___________.
draw conclusions
hypothesis
senses
battery
All factors that can change in an experiment.
data
variable
conclusion
result
The outcome of your test.
variable
results
experiment
question
A testable prediction to the outcome of a problem that has not yet been tested.
data
theory
hypothesis
fact
The independent variable is the ONE thing you _____.
change on purpose
control or keep constant
measure
The variable that is being measured or observed is called the _______________.
*Hint: this is the variable that is the result or effect.
independent variable
dependent variable
control variable
An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid: water, apple juice, or milk. What variables should be kept constant/controlled?
type of plant, flower pot, soil, and amount of sunlight
water, apple juice, milk
only the amount of sunlight
type of plant only
Mr. Raz sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the dependent variable.
height of the ramp
distance traveled by the ball
mass of the ball
weight of the ball
What is the difference between a Dependent Variable & Independent Variable.
dependent is purposefully change the independent changes in response
independent is purposefully change the dependent changes in response
dependent is kept constant
independent is kept constant
In Redi's experiment he placed pieces of meat in covered & uncovered jars then identified which pieces of meat later became infested with maggots.
What is the dependent variable in this experiment?
jar type
covering of jars
type of meat
amount of maggots
How does phone use prior to bedtime affect an individual’s quality of sleep?
What is the independent variable in this experiment?
amount of phone use
how long they sleep
mattress type
quality of sleep
After an experiment is carried out what must be done next?
make an observation
form a conclusion
analyze data
make a prediction
There are 25 student in Mr. Raz's class.
What type of observation is the previous statement?
Quantitative Observation
Qualitative Observation
The students in Mr. Raz's class love science.
What type of observation is the previous statement?
Quantitative Observation
Qualitative Observation
Which building blocks are correctly matched to the macromolecule they form?
Amino acids make proteins.
Glucose molecules make lipids.
Nucleotides make carbohydrates.
Fatty acid chains make nucleic acids.
Which of the following statements illustrates why carbon atoms are so important in living organisms?
Carbon atoms contain large stores of energy.
Carbon is found in most inorganic compounds.
Carbon atoms are polar which allows them to dissolve many compounds.
Carbon is able to bond to many other atoms to form large and complex molecules.
Which of the following groups of macromolecules are composed of three fatty acid chains bonded to a glycerol?
lipids
proteins
nucleic acids
carbohydrates
Use the figure below to answer the following question.
Which of the following structures is circled and labeled X in the figure above?
nucleotide
amino acid
nucleic acid
DNA molecule
The graph below shows the progress of a biochemical reaction.
What effect would an enzyme have on the reaction?
An enzyme would increase the amount of energy at Point 3.
An enzyme would increase the amount of energy needed at Point 1.
An enzyme would decrease the energy needed to move from Point 1 to Point 2.
An enzyme would cause the amount of energy at Point 1 and Point 3 to switch places.
The diagram below shows three repeating units of a polymer.
Which of the following molecular structures make up the repeating units shown in the diagram?
fatty acid
nucleotide
amino acid
monosaccharide
Which group of macromolecules is responsible for transferring genetic information
to new cells?
lipids
proteins
nucleic acids
carbohydrates
At very high temperatures, most enzymes do not increase the rate of the reactions they regulate. What is the most likely reason for this lack of enzyme activity at very high temperatures?
The enzyme denatures and can no longer function properly.
The enzyme would have already broken down at a much lower temperature.
The products would have already been used up in the reaction by the time it reaches that high temperature.
The enzyme would have already sped up the rate of reaction as much as it could and would not be affected by the increase in temperature.
Which statement correctly describes a property of enzymes?
Enzymes react at identical rates under all circumstances.
Enzymes are destroyed and then reformed after each reaction.
Enzymes form permanent structures when they bind to substrates.
Enzyme structures are specific to the type of substrate they bond to.
A water molecule is composed of 2 Hydrogen atoms and 1 Oxygen atom. What is the chemical equation for water?
HO
H2O
H3O
H2O2
Water is a polar molecule, which means it has a positive and a negative side. Hydrogen bonds form when:
The positive end of one water molecule bonds to the positive end of another water molecule.
The negative end of one water molecule bonds to the negative end of another water molecule.
The positive end of one water molecule bonds to the negative end of another water molecule.
The ability of water molecules to stick to each other, creating surface tension is called:
Cohesion
Adhesion
Insulation
pH
The fact that water can stick to other substances is called:
pH
Adhesion
Cohesion
Insulation
Heat Capacity is a measure of the heat required to raise the temperature of 1g of a substance by 1°C.
So...
True or False:
Water has a very high heat capacity, which means it resists changing temperature when heat is added or removed.
True
False
Why does ice float on water?
When it freezes it becomes less dense
When it freezes it becomes more dense
When it freezes its density stays the same
The bond that holds the Oxygen and Hydrogen atoms together in a water molecule is a ________ bond.
ionic
Hydrogen
Covalent
Weak
When salt is dissolved in water, water is the
solvent
solute
solution
reactant
A substance with a pH of 6 is considered...
Alkaline (Basic)
Acidic
Which acid listed is the strongest acid?
Hydrochloric acid pH 1.0
Sulfuric acid pH 1.2
Tomatoes pH 4.2
Water pH 7.0
Oil and water don't mix because oil is
hydrophilic
hydrophobic
an emulsifier
a buffer
Is the density of ice lower, higher, or the same as liquid water?
Lower
Higher
The same
Regarding the polarity of a water molecule, the Oxygen side of the molecule has a slightly ____________ charge while the Hydrogen side of the molecule has a slightly ___________ charge.
positive, negative
negative, positive
neutral, positive
negative, neutral
The _____________ bond between water molecules attributes to water's cohesive properties, such as cohesion, capillary action, and surface tension.
covalent
ionic
metallic
hydrogen
Water is able to dissolve sodium chloride (NaCl or salt) because...
The polar areas of water molecule attract the opposite charged ions of sodium chloride
The shape of the water molecules pushes the sodium and chloride ions apart
The oxygen in the water molecules reacts with the sodium and chloride ions
Water molecules and sodium chloride are covalently bonded
Water is not a good dissolver of oil mainly because...
Oil is thicker than water
Oil is also a liquid
Oil molecules are nonpolar
Oil is colder than water
