Chemical equations need to be balanced in order to satisfy the law of

a. molecular changes.

b. conservation of mass.

c. products and reactants.

A student prepares a mixture of sugar and coffee. The sugar seems to disappear as it mixes with the coffee. Is this mixture homogeneous or heterogeneous?

How many HNO3 molecules are in 4.20 grams?

If Uranium-240 emits an alpha particle, what does it transmutate into? A) Thorium - 236 B) Thorium-238 C) Plutonium-244 D) Uranium-235

The properties of metals include all but which one of the following A. Conductors of heat B. Malleable - you can bend and mold it C. Ductile - you can stretch it in strings D. Usually hard and solid at room temperature E. Breaks easily

What element came from of the chemist who first published the periodic table?

If the moles and temperature of a gas are held constant, the pressure of a gas doubles when: Volume is halved Volume is quadrupled Volume is doubled Volume is also held constant

The life function of transport in an organism directly involves those activities used to 1. absorb and distribute materials 2. obtain and hydrolyze materials 3. release energy from food 4. produce cellular waste product

What is the orbital diagram for phosphorus

The atoms of gaseous helium are

The subatomic particle that has the least mass is the ...