2 grams of potassium (K) reacts with 5 grams of Oxygen (O). According to the Law of Conservation of Mass, how many grams of potassium oxide (K2O) will be produced? (1 point)
Responses
7 grams
7 grams
10 grams
10 grams
5 grams
5 grams
2 grams
9 answers
10 grams
Which of the following equations demonstrates the Law of Conservation of Mass? (1 point)
Responses
CH4+O2→C+2H2O
CH4+O2→CO2+H2O
CH4+O2→CO2+HO
CH+O2→CO2+H2O
Responses
CH4+O2→C+2H2O
CH4+O2→CO2+H2O
CH4+O2→CO2+HO
CH+O2→CO2+H2O
The equation that demonstrates the Law of Conservation of Mass is:
CH4 + 2O2 → CO2 + 2H2O
This equation shows that the number of atoms on both sides of the reaction is balanced. The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction, so the total number of atoms on both sides of the equation should be the same.
CH4 + 2O2 → CO2 + 2H2O
This equation shows that the number of atoms on both sides of the reaction is balanced. The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction, so the total number of atoms on both sides of the equation should be the same.
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
Zn + 2HCl → H2 + ZnCl2
Zn + 2HCl → H 2 + ZnCl 2
Li2CO3 → LiO + CO2
Li 2 CO 3 → LiO + CO 2
CO2 + H2O → CH2OH + O2
CO 2 + H 2 O → CH 2 OH + O 2
CH4 + O2 → CO2 + 2H2O
Responses
Zn + 2HCl → H2 + ZnCl2
Zn + 2HCl → H 2 + ZnCl 2
Li2CO3 → LiO + CO2
Li 2 CO 3 → LiO + CO 2
CO2 + H2O → CH2OH + O2
CO 2 + H 2 O → CH 2 OH + O 2
CH4 + O2 → CO2 + 2H2O
The chemical equation where the number of atoms in the reactants is the same as the number of atoms in the products is:
CH4 + 2O2 → CO2 + 2H2O
CH4 + 2O2 → CO2 + 2H2O
Which statement is true regarding a chemical reaction?(1 point)
Responses
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 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 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.
Even if the total number of atoms does not change, mass may not be conserved in the reaction.
Responses
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 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 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.
Even if the total number of atoms does not change, mass may not be 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.
The total number of atoms does not change, so mass is 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
179 amu
179 amu
215 amu
215 amu
108 amu
108 amu
161 amu
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
179 amu
179 amu
215 amu
215 amu
108 amu
108 amu
161 amu
To calculate the total mass of the reactants, we need to add up the masses of all the individual atoms in the reactant molecules.
In FeCl3, there is 1 iron atom (Fe) with a mass of 56 amu, and 3 chlorine atoms (Cl) with a mass of 35 amu each. Therefore, the total mass of FeCl3 is:
1 iron atom (Fe) + 3 chlorine atoms (Cl) = 56 amu + (3 * 35 amu) = 56 amu + 105 amu = 161 amu
In 3H2O, there are 6 hydrogen atoms (H) with a mass of 1 amu each, and 3 oxygen atoms (O) with a mass of 16 amu each. Therefore, the total mass of 3H2O is:
6 hydrogen atoms (H) + 3 oxygen atoms (O) = (6 * 1 amu) + (3 * 16 amu) = 6 amu + 48 amu = 54 amu
To find the total mass of the reactants, we add the mass of FeCl3 and the mass of 3H2O:
Total mass of the reactants = mass of FeCl3 + mass of 3H2O = 161 amu + 54 amu = 215 amu
Therefore, the total mass of the reactants is 215 amu.
In FeCl3, there is 1 iron atom (Fe) with a mass of 56 amu, and 3 chlorine atoms (Cl) with a mass of 35 amu each. Therefore, the total mass of FeCl3 is:
1 iron atom (Fe) + 3 chlorine atoms (Cl) = 56 amu + (3 * 35 amu) = 56 amu + 105 amu = 161 amu
In 3H2O, there are 6 hydrogen atoms (H) with a mass of 1 amu each, and 3 oxygen atoms (O) with a mass of 16 amu each. Therefore, the total mass of 3H2O is:
6 hydrogen atoms (H) + 3 oxygen atoms (O) = (6 * 1 amu) + (3 * 16 amu) = 6 amu + 48 amu = 54 amu
To find the total mass of the reactants, we add the mass of FeCl3 and the mass of 3H2O:
Total mass of the reactants = mass of FeCl3 + mass of 3H2O = 161 amu + 54 amu = 215 amu
Therefore, the total mass of the reactants is 215 amu.
1 answer