What were most of the elements discovered when Mendeleev developed his original periodic table?

a. gases

b. radioactive

c. liquids

d. solids

What is the relationship between mass and the lifespan of a star

A chemist has two compounds that do not chemically react. He thinks that by finding the right catalyst, he can get them to react. Why is the chemist incorrect?

Lance is rubbing two sticks together. The friction causes the kinetic energy from rubbing the two sticks to be converted into A. heat energy. B. chemical energy. C. potential energy. D. electrical energy.

10. List the six main body areas:

What is the tangent function used to find and what are its units

What is a difference between an isotope and a ion

2. An airplane travels 335 miles in 45 minutes. How fast does it travel? How fast is that in km/hr?

A falling skydiver opens his parachute. A short time later, the weight of the skydiver-parachute system and the drag force exerted on the system are equal in magnitude.

Consider the expression below. Assume m is an integer. 6m (2m + 18) Enter an expression in the box that uses the variable m and makes the equation true. (Simplify your answer completely. If no expression exists, enter DNE.)

What could be put into the center section of this Venn diagram?