Which of the following is an example of a chemical change?

a.

ice melting

b.

pounding gold into a coin

c.

milk souring

d.

a puddle of water evaporating

A sodium ion has 11 protons, 12 neutrons, and 10 electrons. Which of the following is true? Answer Options with 5 options A. Sodium's atomic mass is 33 amus. B. Sodium's atomic number is 21. C. Sodium has a net negative charge. D.

A measure of kinetic energy is a measure of which variable

How many milliliters of a 0.266 m kno3 solution are required to make 150.0 ml of 0.075 m kno3 solution? 42.3 ml 23.6 ml 35.1 ml 18.8 ml?

Which statement is true? Select one: a. Hydroelectric power, a nonrenewable resource, is generated from moving water. b. Oil, a nonrenewable resource, is processed to make jet fuel. c. Propane, a renewable resource, is used in some heating systems.

What is the name of the smaller units that compose nucleic acids? A. DNA B. RNA C. nucleotides D. nucleic molecules

What is a scientific explanation for a range of hypotheses and observations supported by testing

A chemical reaction involves the rearrangement of atoms to form new molecules. During a chemical reaction, however, atoms are neither created nor destroyed. Which of the following is true about the atoms involved in a chemical reaction? A.

What is the new concentration, after diluting 300 mL of a 1.5 M LiCl solution to 1L

The answer that he gave was wrong

In which orbital does an electron in a bromine atom experience the smallest?