If Peter carries a 20 kg weight up a flight of stairs in 20 seconds and Mary carries the same 20kg weight up a flight of stairs in 30 seconds, who does the most work?

2. If you had three unknowns which are starch, BaSO4, and MgO, how can you identify starch among them?

The Bantu were experts in this form of metallurgy. gold steel iron copper

For the following compound, determine each element and if the element is a metal or nonmetal. Also determine if the compound has an ionic, covalent, or metallic bond: NaCl SO2 CaO HF NO2 H2O

If it 1:40 then what time will it be in 3 hours and 20 minutes

When is energy released during a chemical reaction?

The average kinetic energy of the particles in a gas A. is not affected by the temperature of the substance. B. increases as the temperature of the substance decreases. C. is proportional to the temperature of the substance. D.

If the molar mass of NaCl is 58.44 g/mol, what amount of NaCl (in mol) is contained in 250.0 mg of NaCl?

Which has more surface area, a rock the size of your hand or a handful of small rocks?

4Al (s) + 3O2 (g) - >2Al2O3 (s) the reaction is started by mixing 10.0g of Al and 10.0g of O2. What is the limiting reaction and how much Al2O3 is produced?

F 3.84 moles of methane are consumed in this reaction, how many moles of HCN will be produced?