Which type of chemical reaction needs to absorb energy to proceed

Chlorophylls absorb most light in which colors of the visible range?

What does the scientific method try to reduce?

How would the speed of Earth's orbit around the sun change if Earth's mass increased by 4 times? a. It would increase by a factor of 2 c. It would decrease by a factor of 2 b. It would increase by a factor of 4 d. The speed would not change

What is the tension on a rope causing a 7.50 kg box to accelerate to the right at 4.00 m/s^2 across a frictionless surface

A charged ballon attracts small bits of paper. Why does this happen?

Tsunami waves are almost the same as ripples caused by throwing a rock into a pond. what is the major difference between the two?

A hot air balloon pilot wants the balloon to quickly rise several feet higher so it will be above some trees in the distance. Which best explains how the pilot can make the balloon rise? 1.

The density of pine is generally about 0.5 g/cm3. What is the mass of a 800 cm3 piece of pine Download pdf

The heat energy released or absorbed by a chemical reaction is generally determined by the difference between the energy that

A woman with a mass of * kg is standing on the rim of a large disk that is rotating at an angular velocity of 0.550 rev/s about an axis through its center. the disk has a mass of * kg and a radius of * m.