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
CH4 + O2 → CO2 + 2H
The correct 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)
• Even if the total number of atoms does not change, mass may not be 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.
• The total number of atoms does not change, so mass is conserved in the reaction.
The correct statement regarding a chemical reaction is:
• 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.
FeCly + 3H20 - Fe(OH)з + 3НС|
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?
• 108 amu
• 161 amu
• 179 amu
• 215 amu
To find the total mass of the reactants, we need to multiply the number of atoms of each element by their respective atomic masses and sum them up.
FeClx has one Fe atom and one Cl atom, and their masses are 56 amu and 35 amu, respectively. So, the total mass of FeClx is (1 * 56) + (1 * 35) = 91 amu.
H2O has two H atoms and one O atom, with masses of 1 amu and 16 amu, respectively. So, the total mass of H2O is (2 * 1) + (1 * 16) = 18 amu.
Now, let's calculate the total mass of the reactants by adding the masses of FeClx and H2O:
Total mass = 91 amu + 18 amu = 109 amu.
Therefore, the correct answer is:
• 109 amu
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)
• 152 amu
• 228 amu
• 38 amu
• 76 amu
In a chemical reaction, the total mass of the reactants is conserved, meaning it remains the same as the total mass of the products.
Since two molecules with a total mass of 76 amu react to form a single molecule, the mass of the molecule that is formed will also be 76 amu.
Therefore, the correct answer is:
• 76 amu