The atomic number of boron is 5. what is the mass number of a boron atom with 4 neutrons?

When an object moves, stops moving, changes speed, or changes direction, how do scientists describe that condition? a. a balanced set of forces b. stable factors c. frictional force d. unbalanced forces

Which particle is the smallest?

What is high specific heat?

Two different compounds are formed by the elements nitrogen and oxygen. The first compound, compound P1, contains 64.17% by mass nitrogen and 35.73% by mass oxygen. The second compound, compound P2, contains 47.23% by mass nitrogen and 52.

Which structure in a plant is at the same level of organization as a heart in an animal?

Which of the following pollutants is NOT created by fossil fuels? a. sulfur dioxide c. nitrogen dioxide b. phosphodioxide d. carbon dioxide

What causes velocity to change?

A radioactive sample is 555 years old. It's half life is 111 years. How many half lives?

An ion of magnesium has 12 protons and a charge of + 2. how many electrons are in this ion? A. 2 B. 20 C. 12 D. 14

A mixture consists of sand and an aqueous salt solution. Which procedure can be used to separate the sand, salt, and water from each other? (1) Evaporate the water, then filter out the salt. (2) Evaporate the water, then filter out the sand.