A certain ore is 33.0% nickel by mass. How many kilograms of this ore would you need to dig up to have 25.0 g of nickel?

3. Which is held constant when a gas obeys Boyle's law? A. motion temperature B. pressure D. volume linetic molecular

4. Which of the following is NOT a common property of bases? A. Feels slippery B. tastes bitter C. Reacts with metal D. Changes colors of indicators

What kind of charge does a proton have?

What is the relationship between Ka and Kb with Kw? The sum of Ka and Kb equals the auto-dissociation constant for water. The product of K a and K b equals the auto-dissociation constant for water.

The volume of a given quantity of a gas must increase if:

If EG = 19 and FG = 12 then EF = ?

Given the following reaction: 4Fe + 302 → 2Fe2O3 How many grams of Fe2O3 will be produced from 24.0 g of Fe and 5.00 g of O2? grams (round to three significant figures)

Which Group 16 element combines with hydrogen to form a compound that has the strongest hydrogen bonding between its molecules? 1. oxygen 2. selenium 3. sulfur 4. tellurium

How many hydrogen atoms are in 2.80 mol of ammonium sulfide?

What is a large oval structure that directs all of the cells activities?