An alloy of tin and copper contains 16% tin. How much tin (to the nearest tenth) must be added to make 820 pounds of alloy that is 18% tin?

Which principle best explains how this thermometer works? (1) A liquid changes to a gas when heated. (2) A gas changes to a liquid when heated. (3) A liquid expands when heated and contracts when cooled.

This Venn diagram is being used to compare the classification systems of Aristotle and Whittaker. Which description belongs in the space labeled X?

a helium balloon has a volume of 2.95 liters at 25 c. the volume of the ballon decreased to 2.25 l after it is placed outside on a cold day. what is the outside temperature in c?

The fda limit for levels of toxic methylmercury in fish is 1 ppm. In a 100 g sample of fish, what mass of methylmercury does this equal?

How do you use pedigrees to determine and explain the inheritance of traits?

Which combination of elements would produce an ionic compound? a. Nitrogen and carbon b. Carbon and oxygen c. Sodium and magnesium d. Potassium and sulfur e. Phosphorus and chlorine

What bond is it when two hydrogen atoms combine

Greg classified some substances as shown in the table. Greg's Table Soluble in Water Insoluble in Water Dishwashing detergent Cloth Drink mix Plastic Sand Copper Why is Greg's table incorrect? Plastic is soluble in water. Copper is soluble in water.

What the magnetic force

What is the mass (in grams) of 9.42 * 1024 molecules of methanol (CH3OH) ?