John can cover 84 cm with each stride he takes while running. If he runs 2.5 km, how many strides will he need to take

If an element has 3 valence electrons, what charge will likely form on its ion? Hint: It will lose those electrons. What happens to the charge when it loses 3 electrons? A, + 3 B, - 3 C. + 5 D, - 5

Solid copper (II) hydroxide is heated to produce

Gaseous butane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water. what is the theoretical yield of water formed from the reaction of of 5.23 g butane and of 27.1 g oxygen gas? round your answer to significant figures.

What is the charge of a proton, electron and neutron

Which of the following is a constant pressure calorimeter? 1. bomb calorimeter 2. iced tea calorimeter 3. explosive calorimeter 4. coffee cup calorimeter

Is when hot parts of the earth rise as cooler parts sink due to differences in density.

Distinguish between the structures of arteries, capillaries, and venies. what is the function of each.

Which phase of matter has a fixed volume but variable shape

Given 10.8 grams of substance Y, if the substance absorbs 231 kilojoules of energy and the specific heat of the substance is 6.55 J/g·°C, what is the change in temperature?

Which sphere includes rocks and minerals? A. atmosphere B. biosphere C. geosphere D. hydrosphere