Chemical Reactions Review
Authored by Christina Rue
Science
8th Grade
PS1 covered
Used 6+ times
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16 questions
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1.
DRAW QUESTION
5 mins • 1 pt
Draw a model of this chemical equation:
2CO2 + H2O −> H2CO3
Label the reactants and label the products
Draw a chart to identify the elements in both and the number of atoms of each on the reactant and product sides.
Answer explanation
The reactants are H2O and CO2, containing 2 atoms of hydrogen, 1 atom of carbon, and 3 atoms of oxygen. The product, H2CO3, contains the same elements and number of atoms. This is an example of the Law of Conservation of Mass because the same elements and number of atoms are balanced in the reactants and the products; no mass/matter was created or destroyed, the atoms were just rearranged by formation of new bonds.
Tags
PS1.A and PS1.B
2.
DRAW QUESTION
3 mins • 1 pt
A reaction produces 3 molecules of the same compound. Examine the model and draw the products. Label the reactants and the products, adding + signs and an arrow.
Answer explanation
Arrangement of reactants to the left of the arrow can vary, as long as it is different from the product (shown to the right of the arrow) and includes all atoms. Because it was given that there are 3 molecules of the same compound, we know that each one contains 1 of substance 2 and 2 of substance 1.
Tags
PS1.B
3.
OPEN ENDED QUESTION
2 mins • 1 pt
Look closely at the water molecules shown to the left. Heat was added increasingly going from the solid state to the gas state. Write a claim, give evidence, and support with reasoning as to whether or not a chemical change occured.
Evaluate responses using AI:
OFF
Answer explanation
No chemical reaction occurred here. The molecules are all H2O and no bonds were broken or formed in changing the states of matter from solid to liquid to gas.
Tags
PS1.A
4.
FILL IN THE BLANK QUESTION
2 mins • 1 pt
The chemical reaction for photosynthesis, without the coefficients for the reactants, is shown here:
___CO2 + ___ H2O (+ light) → C6H12O6 + 6 O2
What is the missing coefficient for both CO2 and H2O?
(a)
Answer explanation
The complete chemical equation for photosynthesis is
6CO2 + 6H2O (+ light) --> C6H12O6 + 6O2. With the products given, there are 6 carbon atoms, (6C...), 12 hydrogen atoms (6H2) and 18 oxygen atoms (O6 and 6O2, which equals 18 when added together. The only way to get this without changing the substances is to include a coefficient of 6 for both CO2 and H2O in the reactants.
Tags
PS1.B
5.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
For this chemical reaction, what are the REACTANTS?
6CO2 + 6H2O (+energy) --> C6H12O6 + 6O2
C6H12O6
6H2O
6O2
6CO2
Tags
PS1.B
6.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
For this chemical reaction, what are the PRODUCTS?
6CO2 + 6H2O (+ light energy) --> C6H12O6 + 6O2
6CO2
6O2
6H2O
C6H12O6
Tags
PS1.B
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is an element?
A material made by chemically altering natural materials
A pure substance consisting of one type of atom
The smallest unit of matter
Formed when two or more atoms bond together
Tags
PS1.A
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