Which of these following have a positive charges

Will calcite scratch feldspar

Can a beta live in the same tank with an oscar fancy fish

In the periodic table we use today, the elements are arranged by increasing mass. True or false

An aqueous solution of sodium hydroxide containing 2g in 200cm^3 of solution has a concentration of (NaOH = 40). answer in mol/dm^3

The equilibrium vapor pressure is achieved when the rate of evaporation equals what? a. rate of sublimation b. rate of condensation c. rate of freezing d. rate of melting

What is the definition of covalent bond?

How many grams of H2O will be produced if 18.1 grams of Fe are produced? Fe3O4 + H2 - Fe + H20 Select one: O a. 7.8 Ob. 75 O c. 17 O d. 1.5

1. Where are the most massive elements found on the periodic table? A at the bottom right B at the top right C at the top left D at the bottom left

Lenny accidentally drops his matchbox car into a graduated cylinder. if the car has a mass of 10 grams and the water level in the cylinder rises from 41 ml to 46 ml. determine the density of the matchbox car. the formula for density is d = m v

When 12.4 grams of KBr are dissolved in enough water to create a 170-gram solution, what is the solution's concentration, expressed as a percent by mass?