Which of the following statements is a valid hypothesis?

The atmosphere contains more nitrogen than oxygen.

Alien spaceships cause crop circles to form.

Why are most plants green in color?

A frog jumps more often when it is feeling happy.

What is rhe morality of a solution that contains 5.0 moles of solute in 2.0 liters in solution?

Which is the correct balanced equation for copper (ii) sulfate+aluminium➡️aluminium sulfate + solid copper?

Which of the statements about elements is true? 1. No two elements have the same kind of atom. 2. Scientists have identified a little less than 100 elements. 3. The atoms of all elements have the same mass and volume. 4.

How many neutrons does the isotope N-14 have?

What is the scientific word: molecules of an element containing three of the same type

True or False: It is recommended to use sugar cubes to sweeten lemonade because they have a low surface area.

54,000,000 nanometers equals 0.000000054 megameters.

When cream mixes with coffee, is this a chemical or physical change?

A gas occupies 72.1 at stp. At what temperature would the gas occupy 85.9 L at a pressure of 93.6 kPa?

An 80 kg volleyball player lands from a jump and tries to stop her forward motion. The normal contact force exerted by the floor on her shoes is 2000 N. The friction force exerted by the floor on her shoes is 600 N acting backward on the player.