18 Powdered sulfur is yellow, and powdered iron is gray. When powdered sulfur and powdered iron are mixed at 20°C, the powdered iron

(1) becomes yellow (3) remains ionic

(2) becomes a liquid (4) remains magnetic

How many pizzas will you need if 32 people eat 3 slices per person and there are 8 slices per pizza

How many moles are there in 17.6 g NaOH?

Which method is the typical first step when scientists communicate their scientific results? A. placing the results on an Internet site to maximize readership B. distributing the results in press releases to make them well established C.

Which statement best describes synthetic rubber? A) Synthetic rubber is in limited supply compared with natural rubber B) Synthetic rubber has the same properties as natural rubber C) Synthetic rubber has different monomers than natural rubber

Explain what happens to the heat that is being added to a substance when the substance is changing phase.

Which of the following happens during a chemical change? Check all of the boxes that apply 0 One atom or more changes into atoms of another element. New substances with different properties are formed. O Solids, liquids, or gases may form.

The energy derived from the movement of H + ions down an electrochemical gradient from the intermembrane space into the matrix is used to drive the synthesis of ATP. How many H + ions must be moved into the matrix for the synthesis of 1 ATP?

Consider two solutions, solution a and solution b. [h+] in solution a is 370 times greater than that in solution b. part a what is the difference in the ph values of the two solutions?

All of the following are possible sources of error in a scientific investigation except for O measuring materials such as mass and volume incorrectly. o recording experimental data incorrectly. o having a constant in your experiment.

Do polyatomic ions have fixed charges?