You and a friend are looking at the stars and your friend says, "Stars must be shrinking because gravity is constantly pulling their particles together." Explain what is wrong with this reasoning.

Which of the following is not apart of daltons atomic theory 1. Atoms of the same element have the same properties. 2. Matter is composed of atoms. 3. Atoms change into other atoms in chemi - cal reactions. 4.

In a chemical reaction, a reactant binds to an enzyme at a region known as the ...

If humans can see water but not air, can fish see air but not water?

Which of the following is NOT true about running and walking? A. Both do not require special equipment. B. Both can be performed almost anywhere. C. The amount of exerted effort can be controlled in both. D. Both burn the same amount of calories.

A cold glass of water is set outside on a hot day and water droplets develop on the outside of the glass describe whats happening

How many of the following elements have 2 unpaired electrons in the ground state? C Te Hf Si A) 1. B) 2. C) 3. D) 4.

Which has a higher frequency, a neutron or electron? Why?

1) Identify the intensive properties of a sample of matter: A. mass B. hardness C. color D. volume E. reflectivity

Suppose you have a buffer containing 0.400 M hydrazine and 0.300 M hydrazinium chloride at equilibrium. Then you add 25.2 g of NaOH to 2.0 L of the buffer. What change in pH is caused by the addition of the base? A) 0.99 B) 0.40 C) 8.71 D) - 0.36

The heart is an example of which level of organization within an organism? O cell organ tissue organ system O O