How long does it take (in minutes) for light to reach Mercury from the Sun, a distance of 6.26 * 107 km?

Without doing a calculation, predict whether the entropy change will be positive or negative when the following reaction occurs in the direction it is written. a. CO2 (g) + 2H2 (g) → CH3OH (l) b. Br2 (l) + H2 (g) → 2HBr (g) c.

Which particles can be found in the nucleus of an atom? alpha particles protons and neutrons neutrons and electrons protons and electrons

Which characteristic of an atom always varies among atoms of different elements

A microbiologist hypothesized that Staphylococcus aureus is more susceptible to antibiotics than Escherichia coli. She tested her hypothesis by exposing the two species of bacteria to three different antibiotics.

A boy jumps into a cold swimming pool and his body temperature goes down. His muscles, blood vessels, and nervous system work together to restore his body temperature.

Which is considered a chemical mutagen? tanning beds tobacco X-rays precious metals

Combining 0.380 mol Fe2O3 with excess carbon produced 13.7 g Fe Fe2O3 + 3C → 2Fe + 3CO What is the actual yield of iron in moles? What is the theoretical yield of iron in moles? What is the percent yield?

When a hydrogen electron makes a transition from n=3 to n=1?

If two electrons have same number of protons but different number of neutrons can they be atoms of the same element?

A gas has a pressure of 0.370 atm at 50.0 °C. What is the pressure at 22 °C, assuming volume remains constant? A.) 0.34 atm B.) 0.58 atm C.) 0.74 atm D.) 0.98 atm