In the reaction HF + Al AlF3 + H2, which two substances would have a coefficient of 2 if the reaction were balanced?

Check all that apply.

A. H2

B. Al

C. AlF3

D. HF

One of the longer sides of a kite is 39 feet. one of the shorter sides is 25 feet. half the length of the shorter diagonal is 15 feet. what is the area of the kite?

Which of the following programs can open a bitmap file? a. Windows Paint b. Disk Cleanup c. Notepad d. WordPad

Argon (Ar) is a stable gas with a very high ionization energy. Which statement explains why? A. It has a full outer shell of electrons. B. It has 18 protons in its nucleus. C. It has 22 neutrons in its nucleus. D. It has two shells of electrons.

How many days will it take for one half of the original amount of a radioactive substance to decay if the half-life is 30 days? a. 3 days b. 15 days c. 30 days d. 60 days

What does a cell wall do in one sentence? And is it found in plants or animals?

During combustion, a fuel's electromagnetic energy is converted into thermal energy.

Explain why glucose is important to a cell

4. How far does a car travel in 90 seconds if it is traveling at a speed of 55 m/s?

Total energy input is 1400 and my efficiency is 80% so what is the useful energy output in jules?

What is the force of gravity acting on a 2000-kg spacecraft when it orbits two Earth radii from the Earth's center (that is a distance r=6380 km above the Earth's Surface. The mass of the Earth is 5.98 x 1024 kg.