Niobium-91 has a half-life of 680 years. After 2,040 years, how much niobium-91 will remain from a 300.0-g sample?

3 g

18.75 g

37.5 g

100.0 g

Question 10 unsaved in a chemical reaction, the mass of the products question 10 options: has no relationship to the mass of the reactants. is less than the mass of the reactants. is greater than the mass of the reactants.

How would you build a model that is ionized? what happens if an atom is too ionized? how would you build a model that is radioactive? what happens if the imbalance between protons and neutrons becomes too great

Given the reaction: C6H12O6 (s) + 6 O2 (g) 6 CO2 (g) + 6 H2O () How many moles of C6H12O6 (s) are needed to produce 24 moles of carbon dioxide? A) 1.0 moles B) 12 moles C) 24 moles D) 4.0 moles

One mole of a substance has the same number of particles as one mole of any other substance, regardless of what substances are being compared.

A solution of SO2 in water contains 0.00023 g of SO2 per liter of solution. What is the concentration of SO2 in ppm? in ppb?

An 80 kg volleyball player lands from a jump and tries to stop her forward motion. The normal contact force exerted by the floor on her shoes is 2000 N. The friction force exerted by the floor on her shoes is 600 N acting backward on the player.

How does electronegativity affect the polarity of the bond between two atoms?

How much heat (energy) would need to be absorbed by 1.5 g of liquid water to cause a temperature change of 30.45 °C? The specific heat of water is 4.18 J/gºC.

What happens when electrons are passed from one atom to a more electronegative atom?

Calculate the k sp for zinc hydroxide if the solubility of zn (oh) 2 in pure water is 2.1 * 10-4 g/l. calculate the k sp for zinc hydroxide if the solubility of zn (oh) 2 in pure water is 2.1 * 10-4 g/l. 2.9 * 10-3 1.5 * 10-3 9.9 * 10-18 3.8 * 10-17