Which statement is true about the particles of a solid when the solid

changes into a liquid?

1) They stop vibrating.

2) Their kinetic energy increases.

3) They move closer to each other.

4) The attractive force between them increases.

What do scientists measure by using a triple-beam balance? Weight Mass Volume Density

The reaction A → products is first order. If the initial concentration of A is 0.646 M and, after 72.8 seconds have elapsed, the concentration of A has fallen to 0.0146 M, what is the rate constant of the reaction?

The osmotic pressure of 9.69 * 10-3 M solutions of CaCl2 and urea at 25°C are 0.585 and 0.237 atm, respectively. Calculate the van't Hoff factor for the CaCl2 solution.

Water is made of two hydrogen atoms and one oxygen atom bonded together. Julia is describing how water undergoes a physical change when it boils. She says that the particles shift to be farther apart and that the oxygen and hydrogen separate.

A sample of copper with a mass of 63.5 g contains 6.02x10^23 atoms. Calculate the mass of a single atom.

Which statement is true about inorganic compounds? A. They are not made of atoms. B. They contain carbon. C. They are not made from living things. D. They are all elements.

Which domain do you find the most interesting why

Complete the matching exercise below by choosing the correct description of each bond type in aqueous solution. 1. covalent bond 2. hydrogen bond 3. electrons shared by atoms a. electrons shared by atoms b.

One mole of calcium ions has the same number of representative particles as which of the following? one mole of calcium nuclei one mole of calcium atoms 6.02 x 1023 calcium ions All of these are correct.

How is chemical symbol and chemical formula difference?