According to Dalton, what happens to atoms during a chemical reaction? Atoms gain or lose energy. Atoms are rearranged. Old atoms are destroyed. New atoms are created.

Helium in a toy balloon does work on its surround - ings as it expands with a constant pressure of 2.52 * 105 pa in excess of atmospheric pressure. the balloon's initial volume is 1.1 * 10-4 m3, and its final volume is 1.50 * 10-3 m3.

Scientist discover that stars in the universe are mostly composed of which elements?

Which compound could be added to hydroiodic acid to neutralize its acidic properties?

Which best explains why sawdust burns more quickly than a block of wood of equal mass under the same conditions? a. The molecules move more quickly in the sawdust than in the block of wood. b. The pressure of oxygen is greater on the sawdust. c.

Which component of air is the primary problem in a condition known as "the bends"? a. He b. CO c. O2 d. N2 e. CO2

The burning of wood in a fireplace generates heat and light in the form of flames. Which of the following terms best describes this type of reaction? a. condensation reaction b. exergonic reaction c. endergonic reaction d.

How are the number of protons and the number of neutrons related?

If a sample of copper with a density of 8.90 g/cm3 displaces 13.0 mL of water when placed in a beaker, what is its mass? a 1.46 g b. 0.685 g c. 116 g

Which statement accurately describes the origin and expansion of the universe

Conversion. 5 km to inches