When phases of a substance are at equilibrium, the molecules are fixed in their phase. True False

15. Which food tastes acidic? radish celery tomato cucumber

Which of the following is NOT an advantage of microwave drying? short drying time high production rates efficient energy usage lowered bacteriologica counts gentle on delicate products

What is a type of intermolecular force? covalent ionic dipole-dipole metallic

In Part 1, suppose a student did not heat the evaporation dish and mixture long enough for all of the ammonium chloride to sublimate. How would the measured mass of ammonium chloride be affected? mass would be higher mass would be lower mass remains unchanged

12. Why might a chemist add a buffer to a solution? The buffer can keep the pH stable when small amounts of acid or base are added. The buffer reacts with the acid or base in solution to form a useful product. The buffer changes color to indicate the pH of the solution. The buffer can magnify the changes to pH caused by adding small amounts of acid or base.

An atom of copper (Cu) has a mass number of 63 and an atomic number of $29$ How many protons does it have? A. 29 B. 34 C. 63 D. 92

Formaldehyde ethylbenzene and hydrogen sulfide are all __ chemicals that are used in industrial processes. A. toxic B. corrosive C. irritant D. harmless

Which of the following formulas is named incorrectly? $(NH_{4})_{2}SO_{4}$ is diammonium sulfate. $P_{4}S_{6}$ is tetraphosphorus hexasulfide. $HNO_{3}$ is nitric acid. $Na_{2}O$ is sodium oxide.

Chemicals that people breathe in to experience some type of high are called __ hallucinogens inhalants anabolic steroids bath salts

(d) Do not contain numerical prefixes? (Select all that apply.) $Li_{2}O$ $C_{2}H_{6}$ $H_{2}S$ co $AsH_{3}$ none of them