In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?(1 point)
Responses
Li2CO3 → LiO + CO2
Li 2 CO 3 → LiO + CO 2
CH4 + O2 → CO2 + 2H2O
CH 4 + O 2 → CO 2 + 2H 2 O
Zn + 2HCl → H2 + ZnCl2
Zn + 2HCl → H 2 + ZnCl 2
CO2 + H2O → CH2OH + O2
CO 2 + H 2 O → CH 2 OH + O 2
The chemical equation in which the number of atoms in the reactants is the same as the number of atoms in the products is:
CH4 + O2 → CO2 + 2H2O
Which statement is true regarding a chemical reaction?(1 point)
Responses
Even if the total number of atoms does not change, 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.
Even if the total number of atoms changes, mass may not be conserved in the reaction.
Even if the total number of atoms changes, mass may not be conserved in the reaction.
The total number of atoms changes, so mass is conserved in the reaction.
The total number of atoms changes, so mass is conserved in the reaction.
The total number of atoms does not change, so mass is 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:
Even if the total number of atoms does not change, mass may not be conserved in the reaction.
Use the equation and the table to answer the question.
FeCl3 + 3H2O → Fe(OH)3 + 3HCl
Element Mass of an Atom (amu)
Fe 56
Cl 35
H 1
O 16
Iron chloride and water react according to the equation shown. The table shows the atomic masses of the elements involved in the reaction. What is the total mass of the reactants?
(1 point)
Responses
108 amu
108 amu
215 amu
215 amu
161 amu
161 amu
179 amu
To calculate the total mass of the reactants, we need to add up the individual masses of each element present in the reactants.
In FeCl3, we have one Fe atom with a mass of 56 amu and three Cl atoms with a mass of 35 amu each. So, the total mass of FeCl3 is:
56 amu (Fe) + 3 * 35 amu (Cl) = 56 amu + 105 amu = 161 amu
In 3H2O, we have three H atoms with a mass of 1 amu each and two O atoms with a mass of 16 amu each. So, the total mass of 3H2O is:
3 * 1 amu (H) + 2 * 16 amu (O) = 3 amu + 32 amu = 35 amu
Adding the two masses together, we get:
161 amu (FeCl3) + 35 amu (3H2O) = 196 amu
Therefore, the total mass of the reactants is 196 amu.
The 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
The chemical equation in which the number of atoms in the reactants is the same as the number of atoms in the products is the equation:
CH4 + O2 → CO2 + 2H2O
To determine this, we need to count the number of atoms of each element in the reactants and products:
Reactants:
- CH4: 1 carbon (C) atom + 4 hydrogen (H) atoms = 1C + 4H
- O2: 2 oxygen (O) atoms
Products:
- CO2: 1 carbon (C) atom + 2 oxygen (O) atoms = 1C + 2O
- 2H2O: 4 hydrogen (H) atoms + 2 oxygen (O) atoms = 4H + 2O
As you can see, in this equation, the number of atoms in the reactants (1 carbon (C) atom + 4 hydrogen (H) atoms + 2 oxygen (O) atoms) is equal to the number of atoms in the products (1 carbon (C) atom + 4 hydrogen (H) atoms + 4 hydrogen (H) atoms + 2 oxygen (O) atoms).
Therefore, the correct answer is:
CH4 + O2 → CO2 + 2H2O