Pennies used to be made of copper and zinc and had a mass of of 3.1 g. Today pennies are made of copper-platted zinc and have a mass of 2.5 g. A new penny's mass is what percent of an old penny's mass?

List two SI-derived units for volume, and explain how they relate to the cubic centimeter.

If we place the like poles of two magnets facing each other what will happen? A. Nothing B. They will both become negative. C. They will attract each other. D. They will repel each other.

What's the difference between almond flour and regular flour?

All isotopes of an element with an atomic number greater than ___ are radioactive.

What is the mass of a ink pen with triple beam balance

3. Ordered: 30 mg Furosemide Available: 40 mg/2ml. How many milliliters will be given? Ordered: Acetaminophen 250 mg Available: 500 mg tablets. How many tablets will be given? Ordered: 300 mg Rocephin Available: 500 mg / 10 ml.

A metal having a mass of 44 grams is dropped in 118.2 cm3 of water and sinks to the bottom. The volume of the water and object is 124.3 cm3 . What is the density of the metal?

Calculate the {H+}, {OH-}, oh, pOH, and % dissociation of a 1.0x10^-3 M solution of HCl

What is the mass of potassium chloride when 6.75 g of potassium reacts with an excess of chlorine gas? the balanced chemical equation is:?

Which property of gases is explained by the process of diffusion?