Which of the following is an element?

a. o2

b. CaCl2

c. HPO4

d. CO2

(also i'm freshman in high school, idk why it's saying middle school)

How different psychological perspectives explainthe anxiety?

How is a compound similar to a homogenous mixture. how is it different

If an individual eats foods that do not contain any dairy and only drinks soy milk he or she most likely had a problems digesting

The law of reflection states that if the angle of incidence is 16 degrees, the angle of reflection is ___ degrees.

If a cannon is fired use a=F/m to explain what happens to the cannon and the cannonball.

A chemical bond formed when Adams share three pairs of electrons is A. an ionic bond B. a single bond C. a double bond D. a Triple bond

A 1100 kg car rounds a circular turn of radius 24.6 m. Of the road is flat and the coefficient of static friction between the tires and the road is 0.59, how fast can the car go without skidding

What is the momentum of a 15 kg tire rolling down a hill at 3 m/s? 5 kg • m/s 18 kg • m/s 45 kg • m/s 60 kg • m/s

Which of Newton's laws, when combined algebraically with his law of universal gravitation, can be used to calculate Earth's mass? A) first B) second C) third

Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not? A. Helium has no mass, but air does. B. Helium increases the balloon's mass more than air. C.