The atomic number of magnesium is 12. Its nucleus must contain A) 6 protons and 6 neutrons. B) 6 neutrons and 6 electrons. C) 12 neutrons and no protons. D) 12 protons and no electrons.

If a certain mass of mercury has a volume of 0.002 m3 at a temperature of 20°C, what will be the volume at 50°C? A. 0.002010812m3 B. 0.004021624m3 C. 0.002021624m3 D. 0.000010812m3

Carbon monosulfide ionic or covalent

Which process do hydrogen atoms use to make the Sun's energy?

Which of the following transfers heat by moving particles from one place to another? A. radiation B. conduction C. convection D. temperature

Which of the following does not accurately depict a scientific theory? A. Theories are tested over and over again. B. Theories are supported in many ways. C. Theories may be changed or replaced if new evidence is found. D.

What countries will see the solar eclipse?

Water is a compound. O A. True B. False

How do air quality scientists ensure the air is cleaned? What steps do they take?

Is a mirrors surface opaque or transparent or translucent?

Sound waves can combine to become bigger or smaller true or false