Which of the items below could scientists use to date a layer of rock?

a raindrop on the rock

a fossilized fish

a green leaf that fell off of a tree

an insect flying near the dig site

What is the pH of 1.13 x 10^-13

Which two factors determine sound intensity? A the wave's frequency and speed B the wave's amplitude and the distance from the sound source C the wave's amplitude and speed D the wave's frequency and the distance from the sound source

Which of the following is the correct definition of radiant energy?

2. Calculate the joules of energy required to heat 454.3g of water frum 5.4°C to 98.6°C.

Calculate the rms speed of an oxygen gas molecule, o2, at 29.0 ∘c. express your answer numerically in meters per second.

A solid substance turns into a liquid. Which best describes this change?

List two things you know about nonrenewable energy

Does a mole of hydrogen have the same mass as a mole of oxygen? explain your answer.

A 0.500-L sample of H₂SO₄ solution was analyzed by taking a 100.0mL aliquot and adding mL of. After the reaction occurred, an excess of ions remained in the solution. The excess base required mL of for neutralization.

Ammonia can be prepared by the reaction of magnesium nitride with water. The products are ammonia and magnesium hydroxide. Write and balance the equation.