3. What determines the mass number of an element?

The mumhor of nrotons

When an amoeba engulfs a particle of food a blank is formed

Sally adds 3.13 moles of argon to a 5.29 liter balloon that already contained 2.51 moles of argon. What is the volume of the balloon after the addition of the extra gas?

475 grams of solid calcium oxide reacts with water vapor to form solid calcium hydroxide. Calculate the heat of reaction. (A) - 221.1 kcal (B) + 290.8 kcal C) - 290.8 kcal (D) + 324.6 kcal (E) + 221.1 kcal

Why does the prescence of ione pairs contribute to the polarity of a water molecule a. they allow the bonds between oxygen and hydrogen to be single b. they increase the partial positive charge on the oxygen atom c.

Balance the below half-reaction, which takes place in acidic solution. cr2o72 - (aq) → cr3 (aq) how many electrons are transferred in the balanced half-reaction

What's the ratio of 80% hydrogen

Why is warmer near earth surface

A platinum wedding band contains 0.077 mol of platinum. How many atoms of platinum are in the 15-gram platinum wedding band?

In an ecosystem where 500,000 kcal of sunlight is available for producers, approximately how much chemical energy will be contained in secondary consumers?

Question 6 if a gas pressure gauge reads 32.0 psi, what is the pressure in inches of mercury? 165 in. hg 15.7 in. hg 65.1 in. hg 32.0 in. hg 6.19 in. hg