Chemical reactions can be detected by changes in:

a. temperature

b. color

c. overall mass of the products compared to the mass of the reactants

d. density of the products compared to the reactants

A worker drops a wrench from the top of a tower 92.6 m tall. What is the velocity when the wrench strikes the ground? The acceleration of grav - ity is 9.81 m/s2. Round to the nearest hun - dredth place

A. What is temperature really a measure of?

The use of ultraviolet or fl uorescent dyes in an r-1234yf system is

The concentration of which ion is increased when LiOH is dissolved in water? 1. hydroxide ion 2. hydrogen ion 3hydronium ion 4. halide ion

Happy Horses Stable charges a flat rate of $12 to rent a horse plus $5 per hour. Charlie paid $37 to rent a horse. How many hours, x, did he pay to have the horse?

How many molecules of H2S are required to form 79.0 g of sulfur

How many grams of potassium iodide, KI, are required to make 2.0 L of a 0.1M solution

Which term refers to an electrochemical cell that produces an electric current? A) electrolyte B) voltaic cell C) electrolytic cell D) cathode

How can you determine the valence electrons in an electron configuration?

Methods used to reduce sulfur dioxide emissions from smokestacks are an attempt by humans to A lessen the amount of insecticides in the environment B eliminate diversity in wildlife C lessen the environmental impact of acid rain D use non chemical