The center of this seesaw is used to balance the board with the seats. The children can easily move up and down without much force. the seesaw is an example of wich simple machine?

A balanced reaction equation must have the same number of atoms of each element on both sides of the equation. The reaction C2H5OH+3O2→2CO2+3H2O represents the combustion of ethanol. Count the atoms of each element on both sides of the reaction.

4. A student purified a 500-mg sample of phthalic acid by recrystallization from water. The published solubility of phthalic acid in 100 mL of water is 0.54 g at 14 oc and 18 g at 99 0C.

An element's atomic number is the A. weight of the atom. B. sum of the protons and neutrons in an atom. C. number of protons in an atom's nucleus. D. mass of the atom

What do you, a complex, multicellular organism, have in common with this single-celled algae that lives in the ocean? A) We have nothing in common. B) We have similar cell structure. C) We have the exact same cell parts.

A relationship can be damaged by A. not meeting expectations. B. honest communication. C. exceeding expectations. D. people spending time with one another.

What is the temperature of a gas at STP?

What is the numerical meaning of centimeter

You run an experiment to test the effects of temperature on solubility. What would you heat? A.) solvent B.) solute C.) the room B.) the beaker

What happens when a firework is ignited?

The spines and thick wavy cuticle on a cactus are both what