According to the Big Bang theory, after the "Bang", the universe remained dark until about ___ later, when neutral atoms began form.

*three minutes

*one billion years

*300,000 years

*three billion years

The atoms, molecules, or compound present at the start of a chemical reaction that parcitipate in the reaction. which part of a chemical reaction does this define?

Which of the following is an example of converting kinetic energy into potential energy? a. dropping your backpack on the floor b. walking to class with your backpack on c. sliding the backpack across your desk to a friend d.

Imagine a ball fired from a height of 2.0 m at 3.0 m/s, and at 45° above horizontal. If the ball lands on horizontal ground, where does it do so?

Explain why you move forward and a boat moves backwards when you jump from a boat to a pier

A soap bubble is essentially a thin film of water surrounded by air. The colors you see in soap bubbles are produced by interference.

A derived unit is a combination of fundamental units. Which of the following is an example of a derived unit? a) centimeter (used to measure distance) b) gram (used to measure mass) c) cubic centimeter (used to measure volume)

Technician A says that a heater core leak can be the result of the coolant wearing a hole through the core. Technician B says that a core leak can be caused by chemical action eating a hole through the core. Who is correct?

If the Coast Guard warns of a giant wave of water approaching the shore as a result of a major earthquake, they are warning of a. an aftershock. b. liquefaction. c. a tsunami. d. landslides.

What is the total number of atoms in the following formula? CaBr2 4 3 2 1

Object A with a mass of 500 kilograms hits stationary object B with a mass of 920 kilograms. If the collision is elastic, what happens after the collision? A) Both object A and object B move forward but with different velocities.