Classify N2 as a substance

Two groups complete an experiment requiring the mass measurement to be repeated three times in the experiment. Group I selects a single member of the group to measure the mass.

If the mass of a material is 104 grams and the volume of the material is 21 cm3, what would the density of the material be?

How many moles of ammonia contain 1.51*10^24 NH3 molecules?

What is the difference between an acid and base?

Which element would float in water? 1) Sodium 2) Magnesium 3) Cesium 4) Radium

Which of the following is a measure of randomness in a system? A) entropy. B) kinetic energy. C) potential energy. D) chemical energy.

What substance can be broken down by chemical means? A) ammonia B) aluminum C) antimony D) argon (Castle learning question)

How the law of conservation of mass could be useful for investigating chemical changes

A covalent chemical bond is one in which outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.

To break a chemical bond, energy must be (1) absorbed (2) destroyed (3) produced (4) released