In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products? (1 point)
0 CO2 +H20 - CH2OH +02
O LizCO3 -> LiO + COz
O CHA + 02 - CO2 + 2H20
O Zn + 2HCI -+ H2 + ZnClz
The chemical equation in which the number of atoms in the reactants is the same as the number of atoms in the products is:
Zn + 2HCl -> H2 + ZnCl2
Which statement is true regarding a chemical reaction? (1 point)
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Item 1
• Item2
Item 3
The total number of atoms changes, so mass is conserved in the reaction.
Even if the total number of atoms changes, mass may not be conserved in
the reaction.
Even if the total number of atoms does not change, mass may not be
conserved in the reaction.
The total number of atoms does not change, so mass is conserved in the Reaction
The statement that is true regarding a chemical reaction is:
The total number of atoms does not change, so mass is conserved in the reaction.
Which statement is true regarding a chemical reaction? (1 point)
Item 1
• Item?
tem 3
• The total number of atoms changes, so mass is conserved in the reaction.
o Even if the total number of atoms changes, mass may not be conserved in
the reaction.
o Even if the total number of atoms does not change, mass may not be
conserved in the reaction.
• The total number of atoms does not change, so mass is conserved in the
reaction.
The statement that is true regarding a chemical reaction is:
The total number of atoms changes, so mass is conserved in the reaction.
The correct chemical equation where the number of atoms in the reactants is the same as the number of atoms in the products is:
Zn + 2HCl -> H2 + ZnCl2
To determine which chemical equation has the same number of atoms in the reactants as in the products, we need to count the number of atoms for each element on both sides of the equation.
Let's analyze each equation:
1. 0 CO2 + H2O → CH2OH + O2
- Carbon (C): 1 on each side
- Hydrogen (H): 2 on each side
- Oxygen (O): 3 on the left side and 3 on the right side
2. O LizCO3 → LiO + CO2
- Carbon (C): 1 on each side
- Hydrogen (H): 3 on the left side and 0 on the right side
- Oxygen (O): 4 on the left side and 3 on the right side
3. CHA + O2 → CO2 + 2H2O
- Carbon (C): 1 on each side
- Hydrogen (H): 1 on the left side and 4 on the right side
- Oxygen (O): 2 on the left side and 4 on the right side
4. Zn + 2HCl → H2 + ZnCl2
- Zinc (Zn): 1 on each side
- Hydrogen (H): 2 on the left side and 2 on the right side
- Chlorine (Cl): 0 on the left side and 2 on the right side
From the analysis above, we can see that option 4, Zn + 2HCl → H2 + ZnCl2, has the same number of atoms in the reactants (Zinc, Hydrogen) as in the products (Hydrogen, Zinc Chloride). Therefore, the answer is option 4.