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Which of the following equations is balanced?
The motion of the molecules increases.
a compound
4Al + 3O2 ------------- 2Al2O3
a compound
3
the same number of atoms were conserved
The number of atoms in the water remains constant.
water
How does increasing heat energy affect hydrochloric acid (HCl) molecules?
The motion of the molecules increases.
a compound
4Al + 3O2 ------------- 2Al2O3
a compound
3
the same number of atoms were conserved
The number of atoms in the water remains constant.
water
Why did the mass of the closed balloon-bottle system stay the same?
The motion of the molecules increases.
a compound
4Al + 3O2 ------------- 2Al2O3
a compound
3
the same number of atoms were conserved
The number of atoms in the water remains constant.
water
Which of the following is formed when two or more different elements combine chemically?
The motion of the molecules increases.
a compound
4Al + 3O2 ------------- 2Al2O3
a compound
3
the same number of atoms were conserved
The number of atoms in the water remains constant.
water
Which of the following substances can be separated into several elements?
The motion of the molecules increases.
a compound
4Al + 3O2 ------------- 2Al2O3
a compound
3
the same number of atoms were conserved
The number of atoms in the water remains constant.
water
Sugar is composed of carbon, hydrogen, and oxygen. Sugar is an example of which of the following?
The motion of the molecules increases.
a compound
4Al + 3O2 ------------- 2Al2O3
a compound
3
the same number of atoms were conserved
The number of atoms in the water remains constant.
water
When 1 gram of water is evaporated in a sealed container, the volume of the water vapor increases but the mass remains constant. Why?
The motion of the molecules increases.
a compound
4Al + 3O2 ------------- 2Al2O3
a compound
3
the same number of atoms were conserved
The number of atoms in the water remains constant.
water
How many molecules are in the compound sodium carbonate 3Na2CO3?
The motion of the molecules increases.
a compound
4Al + 3O2 ------------- 2Al2O3
a compound
3
the same number of atoms were conserved
The number of atoms in the water remains constant.
water
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