What is the percent by mass of chlorine in NaCi? total mass of element in compound molar mass of compound Use %Element x 100

Can something be both a mixture and a pure substance? Explain using examples.

Which has more momentum - an 80 kg runner with a velocity of 2.45 m/s or a 65 kg runner with velocity of 3 m/s? Show work

Platinum is used to catalyze the hydrogenation of ethylene: h2 (g) + ch2ch2 (g) - ⟶pt (s) ch3ch3 (g) chlorofluorocarbons (cfcs) catalyze the conversion of ozone (o3) to oxygen gas (o2) : 2o3 (g) - ⟶cfc (g) 3o2 (g) magnesium catalyzes the

Convert the mass of a molecular substance to moles. 28 grams of FeCl2 is equal to (blank) moles. 2.3 moles of Al (NO3) 3 is equal to (blank) grams.

A given mass of oxygen at room temperature occupies a volume of 500.0 ml at 1.50 atm pressure. what pressure must be applied to compress the gas to a volume of only 150.0 ml? answer

What type of mixture is 100 ml of water with a little bit of salt?

Which statement explains why meiosis haploid cells rather than diploid cells

Which factors can affect the amount of coco mix that can be dissolved in water? Check all that apply

If 25% of a radioactive element remains after 1,000 years, what is the half-life?

How many valence electrons do the alkaline-earth elements have? a. 1 b. 2 c. 7 d. 8