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)

Which of the following describes the bending of light due to a change in its speed? A. reflection B. transmission C. refraction D. absorption

Use the drop-down menus to complete the sentences describing the important ideas in Hess's theory. Hess expanded on Wegener's theory of (blank). possible answers: Pangaea landmass, continental drift, or conveyor belt.

What is the difference between a step-up transformer and a step-down transformer?

What is the weight of this astronaut on the surface of the moon where the strength of gravity is approximately one sixth that of earth?

How are engineers creating clothing that can charge your cell phone. Explain the science behind their innovation.

A digital thermometer reads 15 degrees Celsius, what is the uncertainty?

Determine the magnitude of the effective value of g⃗ at a latitude of 60 ∘ on the earth. assume the earth is a rotating sphere.

What characteristic of a planet determines the acceleration due to gravity on it?

Which set of terms best defines what affects kinetic energy and potential energy, respectively? position, gravity gravity, position velocity, height height, velocity

You are operating a powerboat at night. You see green and white lights on another boat. What should you do?