Letters B and C on this model show us daytime on Earth. Both locations have daytime because of A) Earth's tilt on its axis. B) Earth's orbit around the sun. C) Earth's rotation on its axis. D) Earth's distance from the sun.

Fe (NO3) 2 not sure how to get the oxidation numbers of all elements

What is the total mass of Kr-42 remaining in a 20-mg sample after 48.8 hours? (1) 2.5 mg (2) 5.0 mg (3) 10 mg 4) 20 mg

Which of the following statements is true about catalysts? and Why? a. Catalysts slow down the rate of chemical reactions b. All catalysts are enzymes c. Catalysts are used up during a chemical reaction d.

A certain metal hydroxide, m (oh) 2, contains 32.8% oxygen by mass. what is the identity of the metal m? enter the full name of the element.

How many atoms of helium are in a balloon, which contains 0.47 moles of the gas?

Jake hangs two balloons from a desk so that they are close together but not touching. Jake rubs one balloon with a wool cloth. He does nothing to the other balloon. What happens when he lets go of the balloons? Cecilia is combing her hair.

What is 2 plus 2 minus 1 plus 1

If 6.00 g of the unknown compound contained 0.200 mol of C and 0.400 mol of H, how many moles of oxygen, O, were in the sample?

What effect does distance have on the force of gravity?

In Hooke's law, if a large force produces a small displacement, what does that say about the spring?