Question

Question 1
A)
Hydrogen (H ) and oxygen (O ) combine to make water (H O) in the
following equation.
6H + 3O → ?H O
How many water molecules would be produced?
(1 point)
2 2 2
2 2 2
four
five
three
six

Question 2
A)
In photosynthesis, carbon dioxide (CO ) and water (H O) combine to
form the sugar glucose (C H O ) in the following reaction:
6CO + 6H O → C H O + ?
Assuming this equation is balanced, which part is missing from the
product side?
(1 point)
2 2
6 12 6
2 2 6 12 6
12 hydrogen atoms
6 oxygen atoms
6 carbon atoms
12 oxygen atoms

Question 3
A) Which statement accurately describes what happens in a reaction
when reactants become products? (1 point)
Some reactants rearrange to form products, and any leftover
reactants are lost.
Reactant compounds bond together to form bigger product
compounds.
Reactant bonds break and atoms rearrange to form new product
combinations.
Atomic bonds break and form, constantly changing between the
reactant and product compounds.

Question 4
A)
Methane (CH ) and oxygen (O ) combine to make carbon dioxide
(CO ) and water (H O) in the following unbalanced equation.
CH + O → CO + H O
How many oxygen molecules are necessary in order to complete this
reaction?
(1 point)
4 2
2 2
4 2 2 2
three
four
two
one

Question 5
A)
Use the equation for the formation of water to answer the question.
2H + O → 2H O
Elements such as oxygen and hydrogen naturally exist as diatomic
molecules (i.e., in a paired-atom form). Does the equation for the
formation of water violate the law of conservation of mass? Why or
why not?
(1 point)
2 2 2
Yes, it does because there are two oxygen atoms in the reactants
and only one in the product.
Yes, it does because the diatomic oxygen molecule is not present on
both sides of the equation.
No, it does not because the number and mass of atoms are
conserved even though the number of molecules is not.
No, it does not because there are two water molecules, so the bonds
within the diatomic molecules were not broken.

Answer 1

Here are the answers to the questions provided:

**Question 1:**
How many water molecules would be produced when 6 hydrogen and 3 oxygen combine?
- **Answer: six** (6H + 3O → 6H2O)

**Question 2:**
Which part is missing from the product side in the photosynthesis equation 6CO2 + 6H2O → C6H12O6 + ?
- **Answer: 6 oxygen atoms** (The complete balanced equation also produces 6 O2 as a by-product, but since the question asks for what is missing on the product side of the reaction, it refers to the leftover oxygen atoms.)

**Question 3:**
Which statement accurately describes what happens in a reaction when reactants become products?
- **Answer: Reactant bonds break and atoms rearrange to form new product combinations.**

**Question 4:**
How many oxygen molecules are necessary in order to complete the reaction CH4 + O2 → CO2 + H2O?
- **Answer: two** (The balanced equation for this reaction is CH4 + 2O2 → CO2 + 2H2O.)

**Question 5:**
Does the equation for the formation of water violate the law of conservation of mass? Why or why not?
- **Answer: No, it does not because the number and mass of atoms are conserved even though the number of molecules is not.** (Both sides of the equation have the same number of each type of atom.)

If you have any further questions or need explanations for any of the answers, feel free to ask!