In the formula 4h²o how many total hydrogen atoms are there

A 20.0 kg block of ice is sitting in a cooler. The temperature of the ice is 0.0_C when it is put into the cooler. As it melts, how much heat does the block of ice absorb? a. 8.68 X 10^4 J c. 2.36 X 10^4 J b. 6.68 X 10^6 J d. 3.68 X 10^6 J

What is the composition of earth's Modern atmosphere?

The bottom of a ladder is placed 4 feet from the side of a building. the top of the ladder must be 13 feet off the ground. what is the shortest ladder that will do the job?

2) The distance between the sun and the earth is about 1.5 x 10 to the power of 11m. Express this distance with an si prefix and in kilometers.

What does it mean to say that something is a polar molecule?

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. She placed a ray box in front of a mirror.

When the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isJ.

How do most primary producers make their own food?

The maximum kinetic energy of photoelectrons is 3.10 ev. when the wavelength of the light is increased by 50%, the maximum energy decreases to 1.50 ev. part a what is the work function of the cathode?

Which of the following most completely describes an objects motion? A. a car travels 25 miles. B. The baby crawls 10 feet in 15 seconds toward the door. C. A marble rolls 10 m to the left D. The rain falls at a rate of one inch per hour