Judy wanted to figure out the mass of her backpack. She put the pack on a

balance and added 3, 6, and 4 kg weights so that the balance was even. What

is the mass of her backpack?

A) 5kg

B) 9kg

C) 10kg

D) 13kg

What parts of the body are tested for rigor Mortis

When calcium oxide, CaO (s) dissolves in water, the water becomes hot. Write a chemical equation for this process and indicate whether it is exothermic or endothermic.

A sample of the amino acid tyrosine is barely soluble in water. Would a peptide containing only a string of Tyr residues be more or less soluble, assuming the total number of Tyr groups remains constant? Explain.

Which of the following is evidence that the continents were once part of a supercontinent called Pangaea? Deep ocean trenches Mid-ocean ridges Island Arcs Glacier scrapings

As we stand and watch the hot air balloon rise in the sky, we can imagine what is happening at the microscopic level to the gas molecules inside the balloon. As the balloon rises, the gas molecules are

Why does the body of the bird covered with feathers?

One molecule of caffeine contains 8 atoms of carbon, 10 atoms of hydrogen, 2 atoms of oxygen, 4 atoms of nitrogen. write the formula for caffeine with the elements in the order they are given.

A piece of magnesium metal is heated in the presence of chlorine gas, and a reaction takes place. What compound will most likely be produced? A. Mg2C1 B. MgCl3 C. MgCl2 D. MgCI

What is the pressure of the gas in this mercury manometer if h = 81 mm and atmospheric pressure is 749 mmHg

A microscope containing two or more lenses is an