Question

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

CO2 + H2O → CH2OH + O2
CO 2 + H 2 O → CH 2 OH + O 2

CH4 + O2 → CO2 + 2H2O
CH 4 + O 2 → CO 2 + 2H 2 O

Zn + 2HCl → H2 + ZnCl2
Zn + 2HCl → H 2 + ZnCl 2

Li2CO3 → LiO + CO2

Answer 1

Which statement is true regarding a chemical reaction?(1 point)
Responses

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 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.

Even if the total number of atoms does not change, mass may not be conserved in the reaction.

Answer 2

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

215 amu
215 amu

108 amu
108 amu

179 amu
179 amu

161 amu

Answer 3

that's not an answer

Answer 4

try again plz

Answer 5

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

Answer 6

In a chemical reaction, two molecules with a total mass of 76 amu react to form a single molecule. What is the mass of the molecule that is formed?(1 point)
Responses

38 amu
38 amu

152 amu
152 amu

76 amu
76 amu

228 amu

Answer 7

Li2CO3 → LiO + CO2

Answer 8

The total number of atoms does not change, so mass is conserved in the reaction.

Answer 9

To determine the total mass of the reactants, we need to calculate the sum of the atomic masses of the elements involved in the reaction.

From the equation, we have:
1 FeCl3 + 6 H2O

The atomic mass of Fe is 55.85 amu.
The atomic mass of Cl is 35.45 amu.
The atomic mass of H is 1.01 amu.
The atomic mass of O is 16.00 amu.

Calculating the total mass of the reactants:

FeCl3: 1 Fe + 3 Cl = 1(55.85 amu) + 3(35.45 amu) = 55.85 amu + 106.35 amu = 162.2 amu

H2O: 6 H + 6 O = 6(1.01 amu) + 6(16.00 amu) = 6.06 amu + 96.00 amu = 102.06 amu

Total mass of reactants = FeCl3 + H2O = 162.2 amu + 102.06 amu = 264.26 amu

Therefore, the total mass of the reactants is 264.26 amu.

Answer 10

Apologies for the confusion. To determine the total mass of the reactants, we need to calculate the sum of the atomic masses of the elements involved in the reaction using the given table.

Iron chloride (FeCl3) has an atomic mass of 162.2 amu (55.85 amu for iron + 3 * 35.45 amu for chlorine).

Water (H2O) has an atomic mass of 18.02 amu (2 * 1.01 amu for hydrogen + 16.00 amu for oxygen).

To find the total mass of the reactants, we need to add the individual masses:

Mass of FeCl3 + Mass of H2O
= 162.2 amu + 18.02 amu
= 180.22 amu.

Therefore, the total mass of the reactants is 180.22 amu.

Answer 11

I apologize for the incorrect response earlier. Let's recalculate the total mass of the reactants accurately.

Given the equation is not provided, it is difficult to determine the reactants precisely. Could you please provide the equation or any additional information regarding the reactants?

Answer 12

To calculate the total mass of the reactants, we need to find the sum of the atomic masses of FeCl3 and 3H2O.

FeCl3:
1 Fe + 3 Cl = 1(56 amu) + 3(35 amu) = 56 amu + 105 amu = 161 amu

H2O:
2 H + 1 O = 2(1 amu) + 1(16 amu) = 2 amu + 16 amu = 18 amu
3H2O:
3(18 amu) = 54 amu

Total mass of the reactants = FeCl3 + 3H2O = 161 amu + 54 amu = 215 amu

Therefore, the total mass of the reactants is 215 amu.

Answer 13

If two molecules with a total mass of 76 amu react to form a single molecule, the mass of the molecule that is formed would still be 76 amu.

Therefore, the mass of the molecule that is formed is 76 amu.