Which colorless and odorless gas, produced by radioactive decay of uranium-238, is considered to be a form of pollution?

a. boron

b. oxygen

c. radon

d. hydrogen

A liquid does not have a definite shape, but it does have a dinite volume?

John Dalton believed that: A. Atoms are made of mostly empty space. B. Chemical changes are the result of different atomic combinations. C. Violent chemical reactions can divide atoms into smaller particles. D. All of the above.

Which substance is a strong electrolyte?

23 How many moles are in 500g of Calcium Nitrate? 10 M

Through which of the following ways can heat be transferred? A. only by direct contact between objects at different temperatures OB. by direct or indirect contact between objects at different temperatures C.

Which statements describe abiotic factors in an environment?

A ball rolling across the ground in Death Valley will slow and eventually stop. Why? - the ball's kinetic energy evaporates. - the ball's force is destroyed. - the friction of the ball changed the force to negative ions.

Calculate ∆h0 for the following reaction. br2 ( g. → br2 (l) ∆hf0 br2 ( g. = 30.91 kj/mol; ∆hf0 br2 (l) = 0 kj/mol)

Ethyl alcohol has a latent heat of vaporization of 850 J/g. Water has a latent heat of vaporization of 2260 J/g. Container A contains 1.0 kg of ethyl alcohol. Container B contains 1.0 kg of water. Both liquids are brought to a boil.

The greatest composition by mass in an atom 17/8 O is due to the total mass of its