Two lab assistants measured a metal rod. One reported the measurement as 250 cm, and the other measured it as 250. cm. These measurements are equally precise.

True

False

Which of the following will be the result of dissolving a substance? Select all that apply. a chemical change making a new chemical separating solute particles from the mass of solute making a solution

Issac is studying relationships between

Aerial fireworks contain gunpowder and chemicals that produce colors. What elements would be responsible for producing red, green, and yellow colors?

A 45.0L gas cylinder contains 988 He at 23 degrees C what is the pressure inside the cylinder

Use the periodic table to identify the number of core electrons and the number of valence electrons in each case below. Iron (Fe) : [Ar]4s23d6 core electrons valence electrons

Milk of magnesia is a base. What happens when you drink milk of magnesia for an upset stomach? A) It raises the pH of your stomach. Eliminate B) It lowers the pH of your stomach. C) It cleanses the stomach of harmful, painful bacteria.

Which of the following can be classified as an empirical formula? Why? A. S2Cl2 B. C6H10O4 C. Na2SO3

A student records the value 1.5 atm on a data table. The student is measuring what?

How do you percipitate things from solution to telluric acid?

The energy needed to get a reaction started is the a. enzyme energy. b. activation energy. c. catalyst energy. d. chemical energy.