In an exothermic reaction what is true of enthalpy?

A) it has increased

B) it has decreased

C) it has remained unchanged

D) it has a minimum doubled

One isotope of lead has 82 protons and 124 neutrons in its nucleus. What is the number of protons in the nucleus of any other isotope of lead?

When sugar is dissolved in water, there is hardly any increase in volume. Which characteristic of matter is illustrated by this observation?

Which energy transformation occurs when an electrolytic cell is in operation? (1) chemical energy → electrical energy (2) electrical energy → chemical energy (3) light energy → heat energy (4) light energy → chemical energy

A solvent is A. a substance that causes other substances to enter the plasma phase. B. a substance that dissolves another substance. C. a substance that causes protons to be extracted from the nucleus.

If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, how much ammonia (in grams) is produced? 3H2 + N2 - - > 2NH3

The nerves that Branch out from the spinal cord and connect to the body

The term southern oscillation most nearly refers to

Which kelvin temperature is equivalent to 20°C

When a piece of magnesium metal is added to hydrochloric acid, what gas is produced?

A 10 pound block of lead-210 has a half-life of 22 years. What percentage of the block still contains lead-210 after 60 years? 1.5% 15% 77% 27%