What does the number on the top left of the symbol show?

Which one of the following substances will float in gasoline, which has a density (d) of 0.66 g/mL? mercury (d = 13.6 g/mL) table salt (d = 2.16 g/mL) aluminum (d = 2.70 g/mL) balsa wood (d = 0.16 g/mL) sugar (d = 1.59 g/mL)

Which of the following is the first stage of aerobic respiration? ATP ECT fermentation glucolysis

Classify each description by the phase change it depicts. melting freezing evaporation condensation

Write a molecular equation for the gas-evolution reaction that occurs when you mix aqueous hydrobromic acid and aqueous potassium sulfide.

The chemical equation of magnesium and nitric acid

Assuming that air contains 78 percent N2, 21 percent O2 and 1 percent Ar, all by volume. How many molecules of each type of gas are present in 1.0 L of air at STP?

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.

What ion does a base increase

What is the definition of Amplitude?

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.