Question

Which statement is a correct expression of the Law of Conservation of Mass?

A.
The total mass is unpredictable in a chemical reaction.

B.
The total mass remains the same during a chemical reaction.

C.
The total mass decreases during a chemical reaction.

D.
The total mass increases in a chemical reaction.

Answer 1

please help have to turn in by tomorrow!!!

Answer 2

B

Answer 3

Thank you

Answer 4

can you help me with another please?

Answer 5

Which element(s) are not balanced in this equation?

Fe2O3 + 3 CO → Fe + 3 CO2

A.
Only the Fe is unbalanced.

B.
Only the O is unbalanced

C.
Fe and O are both unbalanced.

D.
C and O are both unbalanced

Answer 6

To me, it looks like only the iron or Fe is the only element that is unbalanced as there are 2 Fe I. The reactants and 1 in the product
So, A

Answer 7

thanks

Answer 8

Nitrogen gas (N2) and hydrogen gas (H2) combine to form ammonia (NH3). Which equation correctly represents this reaction?

A.
N + H → NH

B.
2N2+ H2 → 3NH3

C.
2NH → N + 3H2

D.
N2+ 3H2 → 2NH3

Answer 9

N2+ 3H2 → 2NH3

Answer 10

thanks

Answer 11

Chromium (Cr) can combine with chlorine (Cl2) to form chromium chloride (CrCl3). Which equation is a correct representation of this reaction?

A.
Cr + Cl2→ CrCl3

B.
2Cr + Cl2→CrCl3

C.
2Cr + 3Cl2→CrCl3

D.
2Cr + 3Cl2→ 2CrCl3

Answer 12

D

Answer 13

Iron forms rust, expressed as: Fe2O3. Using information from the Periodic Table, what is the mass of one mole of Fe2O3?

A.
71.85 g

B.
143.70 g

C.
159.70 g

D.
319.40 g

Answer 14

C. 159.70

Fe=55.85g/mol * 2 = 111.70
O=16.00g/mol * 3 = 48.00
+_______
159.70

Answer 15

just message me if you need more help

Answer 16

ok