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

26 A substance that dissolves in water and produces hydronium ions as the only positive ions in the solution is classified as (1) an alcohol (3) a base (2) an acid (4) a salt

Draw a diagram of water molecules, labeling the hydrogen bond and covalent bond

The sign of δ g predicts whether the formation of the products in a reaction is favored. if the value is positive, the formation of the products in a reaction is:

When the concentration of a solute is the same throughout a solution?

Charge on monatomic ions: a) I b) Sr c) K d) N e) S f) In

How can there be snow near a giraffe's home This is actually science so yeah

If a sealed syringe that contains some gas in heated in which direction will the syringe plunger move

Use the drop‑down menus to label the statements as either true of false. Dichloromethane is flammable. true false Methanol is flammable. Concentrated sulfuric acid is corrosive. 10% sodium carbonate solution must be used in the fume hood.

What is the process all rocks are continuously in during which that can change into other types of rocks

Collagen is made of fibers and is found in tendons and cartilage. Collagen contributes to meat toughness and is, therefore, an example of which type of protein?