Font size
WorksheetsChemical Reactions, Properties, Graphing & CERs
Total questions: 70
Worksheet time: 53mins
The starting materials in a chemical reaction are called:
The process by which one or more substances change to produce one or more different substances is called a:
Chemical Process
Reactant
Chemical Reaction
How is a chemical change different from a physical change?
there is no difference
a physical change creates a new substance
a chemical change creates a new substance
This change is a
chemical reaction
physical change
musical change
all answers are correct
The products in the image above are:
CH4 and 2 O2
2 H2O and CO2
All of these are reactants
All of these are products
Which is the correct description of photosynthesis
Photosynthesis is a chemical reaction because the atoms of the molecules get rearranged to form new molecules
Photosynthesis is a chemical reaction because the molecules stay the same before and after the change
Photosynthesis is a physical change because nature makes it happen
Photosynthesis is a physical change because the atoms stay the same
Is rust forming on a bicycle a chemical or physical change?
A change to a substance that happens without forming a new substance is called a:
physical change
chemical change
chemical reaction
combustion
Which one shows that a chemical reaction has occurred?
dissolving
melting
formation of a gas
bending
How can you detect that a chemical reaction has occurred? (select ALL that apply)
There has been a change in properties of the substance that has reacted.
You cannot - it's impossible!
There has been a change in energy of the substance that has reacted.
How does the rearrangement of atoms happen?
When atoms move around
When chemical bonds decide to dance and form new bonds to rearrange the atom
When chemical bonds between atoms break and new bonds form
The attractive force that holds atoms or ions (charged atoms) together is otherwise known as a:
chemical reaction
chemical bond
chemical formula
This is
an atom.
a molecule.
a compound.
a mixture.
This is
a molecule.
an element.
an atom.
a mixture.
What is density?
What best describes a chemical change?
During a lab experiment, two clear liquids were combined into the same container. A bright yellow solid formed at the bottom of the test tube. What is the best explanation for this change?
A physical change because a new substance formed.
A chemical change because a precipitate formed.
A chemical change because the appearance of the solution changed.
Which of the following experiments shows evidence of a chemical change?
Ice melting when you place a penny on it.
Folding a piece of paper.
Blowing air into a cup of water, which creates bubbles.
Combining vinegar and baking soda in a beaker, which produces gas.
When combining milk with vinegar white chunks(solid) form. Why is combining milk with vinegar an example of a chemical change?
Because the milk changes in appearance.
Because a precipitate forms.
Because precipitation takes place.
According to the pH range which substance is more acidic than lemon juice?
Match the following
higher than 7
base
lower than 7
acid
7
neutral
Property of a solid to change into liquid at a certain temperature.
Boiling point
Freezing point
Melting point
Solubility
Property of a liquid to change into gas at a certain temperature.
Melting point
Flammability
Freezing point
Boiling point
Property of chemical to burn or ignite, causing fire or combustion.
Melting point
Boiling point
Flammability
Viscosity
What are the following signs of a chemical reaction below?
(select two)
bubbles
change in color
change in state
change in shape
You have a large glass of water and you stir salt into it until all the salt completely dissolves. Is this a chemical reaction?
Yes
No
What is the purpose of creating a data table?
To make the data harder to access
To waste time and resources
To organize and present data in a structured format for easy analysis and comparison.
To confuse people with unnecessary information
What are the advantages of using a line graph for data representation?
Line graphs are useful for showing trends and changes over time.
Line graphs are not visually appealing
Line graphs are only useful for showing static data
Line graphs are difficult to interpret
What is the overall trend of the the bacterial growth over time?
It went down
It went up and down
It went all over the place- no trend
It went up
Where do you graph the Independent Variable?
X axis
Y axis
Where do you graph the Dependent Variable?
X axis
Y axis
What is the "pattern"?
More sunlight means more tomatoes
More sunlight means less tomatoes
Less sunlight means more tomatoes
There is no pattern.
What is the independent variable?
Favorite Cereal
Number of Votes
Type of cereal
Life cereal
What is the dependent variable?
Favorite Cereal
Number of Votes
Type of cereal
Life cereal
When creating intervals on a graph, they must be __
consistent and evenly spaced
odd numbers
increase in increments of ten
copied directly from the data table
What does CER stand for?
Create Evaluate Respond
Consider Evidence Relevant
Claim Evidence Reasoning
Cause Examine Real-life
What does evidence mean?
a statement that you believe to be true
an opinion
all scientific data that supports your claim
an argument
What does reasoning mean?
a good argument
an explanation that connects your evidence to your claim
a written response to a claim
an opinion you believe in
TRUE or FALSE
On a bar graph, each axis has a label.
TRUE
FALSE
What is a bar graph used for?
To show changes over time
To compare different categories
To display parts of a whole
In a line graph, what does the line connecting the points represent?
The average of the data points
The trend or change over time
The total sum of the data points
The difference between the highest and lowest points
What is the main purpose of using a line graph?
To compare quantities
To show trends over time
To display percentages
To list items in order
In a bar graph, if one bar is twice as tall as another, what does this indicate?
The category is twice as important
The value is twice as large
The category is twice as frequent
The bar is twice as wide
What is the x-axis typically used for in a bar graph?
To show the frequency of data
To list the categories being compared
To display the total value
To indicate the time period
If a line graph shows temperature changes throughout the day, what does each point on the line represent?
The average temperature of the day
The temperature at a specific time
The highest temperature of the day
The total temperature change
The horizontal axis of a line graph is called the __________.
slope
line of best fit
x-axis
y-axis
The vertical axis of a line graph is called the __________.
slope
line of best fit
x-axis
y-axis
A statement that answer a research question is called a:
claim
evidence
reasoning
Claim:
Bouncy balls bounce to different heights on different surfaces
The ball bounced to 70 cm on the floor, 40 cm on the rug, and 10 cm on the dirt
Different surfaces absorb different amounts of energy which causes the ball to lose different amounts of energy for bouncing.
Evidence:
Bouncy balls bounce to different heights on different surfaces
The ball bounced to 70 cm on the floor, 40 cm on the rug, and 10 cm on the dirt
Different surfaces absorb different amounts of energy which causes the ball to lose different amounts of energy for bouncing.
Reasoning:
Bouncy balls bounce to different heights on different surfaces
The ball bounced to 70 cm on the floor, 40 cm on the rug, and 10 cm on the dirt
Different surfaces absorb different amounts of energy which causes the ball to lose different amounts of energy for bouncing.
Claim:
Objects with a density greater than water will sink, while those with a lower density will float.
The coin sinks to the bottom of the container, while the piece of wood and the bottle cap float on the surface.
Density is the amount of mass per unit volume. Objects denser than water have more mass packed into a given volume and thus sink, while less dense objects displace enough water to stay afloat.
Evidence:
Objects with a density greater than water will sink, while those with a lower density will float.
The coin sinks to the bottom of the container, while the piece of wood and the bottle cap float on the surface.
Density is the amount of mass per unit volume. Objects denser than water have more mass packed into a given volume and thus sink, while less dense objects displace enough water to stay afloat.
Reasoning:
Objects with a density greater than water will sink, while those with a lower density will float.
The coin sinks to the bottom of the container, while the piece of wood and the bottle cap float on the surface.
Density is the amount of mass per unit volume. Objects denser than water have more mass packed into a given volume and thus sink, while less dense objects displace enough water to stay afloat.
