Question

Question
1
Question
2
Question
3
A)
Which statement about a chemical reaction supports the claim that mass is conserved?
(1 point)
The reactants and products have the same number of substances.
The reactants and products have the same number of atoms of the same elements.
The reactants and products have the same number of elements.
The reactants and products have the same number of molecules of the same elements.
A)
The atomic mass of titanium is 48 u. Which statement about titanium and carbon is correct?
(1 point)
The mass of one titanium atom is equivalent to the mass of four carbon atoms.
The mass of one titanium atom is equivalent to the mass of eight carbon atoms.
The mass of one carbon atom is equivalent to the mass of four titanium atoms.
The mass of one carbon atom is equivalent to the mass of two titanium atoms.
A)
How does the formation of water from hydrogen and oxygen demonstrate the conservation of mass?
(1 point)
The atomic mass of the reactants equals the atomic mass of the product, and the product has the samenumber of atoms as the reactants.
The atomic number of the reactants equals the atomic number of the product, and the product has thesame number of atoms as the reactants.
The atomic mass of the reactants equals the atomic mass of the product, and the product has the samenumber of molecules as the reactants.
The atomic number of the reactants equals the atomic number of the product, and the product has thesame number of molecules as the reactants.
Question
4
Question
5
A)
Sulfur trioxide reacts with water to form sulfuric acid according to the following reaction:
SO
+ H
O → H
SO
Sulfuric acid (H
SO
) has the atomic mass of 98 amu, hydrogen (H) has an atomic mass of 1 amu, andoxygen (O) has the atomic mass of 16 amu. Use this information to figure out the atomic mass of sulfur(S) and then use that number to calculate the atomic mass of sulfur trioxide (SO
).
(1 point)
3
2
2
4
2
4
3
48 amu
32 amu
116 amu
80 amu
A)
The following equation represents the atomic masses of the reactants and products in a chemicalreaction.
(24 + 16) + (12 + 16 + 16) = 84
Which statement about the reaction is correct?
(1 point)
Two molecules, each with two atoms, combined to make one molecule.
A molecule with 40 atoms combined with a molecule with 48 atoms to produce a molecule with 84 atoms.
Two molecules, each with the same mass, combined to make one molecule.
A molecule with two atoms combined with a molecule with three atoms to produce a molecule with a massof 84 u.

Answer 1

1) The reactants and products have the same number of atoms of the same elements.

2) The mass of one titanium atom is equivalent to the mass of four carbon atoms. (48 ÷ 12 = 4)

3) The atomic mass of the reactants equals the atomic mass of the product, and the product has the same number of atoms as the reactants.

4) Sulfur atomic mass = 98 − (2×1 + 4×16) = 98 − 66 = 32 amu. SO3 mass = 32 + 3×16 = 80 amu. Answer: 80 amu.

5) A molecule with two atoms combined with a molecule with three atoms to produce a molecule with a mass of 84 u.