A mixture consists of sand, salt, and iron filings. Which of the following instruments or materials would NOT be useful in separating this mixture?

a. magnet

b. filter paper

c. screen

d. water

An element x is found to have a mass number of 31 and atomic number of 17. idenrify the group and the period to which it belongs?

Which of the following summarizes photosynthesis? glucose + carbon dioxide → oxygen + water carbon dioxide + water → glucose + oxygen + water oxygen + water → glucose + carbon dioxide + water carbon dioxide + oxygen → glucose + oxygen + water

A semipermeable membrane has a 2 percent salt solution on one side and a 15 percent salt solution on the other side. what will most likely occur?

Is a flame test of an element a chemical or physical change?

an 80kg skateboard moving at 3m/s pushes off with her back foot to move faster. If her velocity increases to 5 m/s, what is her change in kinetic energy as a result

The nose is an organ that acts as an airway for oxygen to enter the body. The nose also contains hairs that trap small foreign objects and stop them from entering the body. Which two systems does the nose play a role in? A. respiratory and immune B.

HBr + Mg (OH) 2 MgBr2 + H2O

What is the ability of a substance to be pulled into a wire? A malleability B ductility C conductivity D solubility

When a counterfeit detection pen is used on an authentic bill, what color does it turn? a. Pale blue b. Pale yellow c. Blue-black d. Pale pink

Why are the outer-most electrons the only ones included in the electron dot diagram?