How many moles are in 15 grams of PH3

A farm is located on the edge of a river. The farmer has an insect problem and doubles the amount of pesticides used for several months on his crops.

If we're interested in knowing the rate at which light energy is received by a unit of area on a particular surface, we're really trying to figure out the A. luminous intensity. B. illuminance of a surface. C. incandescence. D. luminous flux.

What is the ph of a solution with [h3o+] = 1 * 10-9 m?

When 0.40 mol Al is mixed with 0.40 mol Br2, the following reaction occurs: 2Al (s) + 3Br2 (l) → 2AlBr3 (s) Identify the limiting reactant and the moles of leftover reactant, assuming the reaction goes to completion. a.

During an experiment, an unknown substance provided the following results: Red litmus paper turned blue Blue litmus paper stayed blue pH paper turned dark purple This substance is most likely a: a Weak base Strong acid Strong base Weak acid

Explain why ships traveling from east to west across the Atlantic take days longer than ships traveling the same distance from west to east.

In a titration 25.0 ml of a. 20 M NaOH solution is used to neutralize 10.0 ml of HCl. Write the equation for this neutralization reaction and calculate the molarity of the acid.

4*C: 4cm 8*C: 10cm 12*C: 14cm 16*C: 18cm 20*C:24cm 24*C: 12cm what is the independent variable, dependent variable and three constant variables?

In the chemical laboratory, why do scientists use a mortar and pestle? a. to increase surface area of a solute b. to decrease surface area of a solute c. to increase temperature of a solute d. to decrease temperature of a solute

Is a mixture being separated into two elements a chemical change