What is the charge for an ionic compound?

Give the nuclear symbol for the isotope of potassium for which a=40?

A heating curve has two flat lines, or plateaus. What does the plateau at the higher temperature represent? 1. Boiling of a liquid 2. Melting of a solid 3. Increase in temperature of a substance 4. Decrease of a substance

How much water should be added to 20 ml of 20 % alcohol solution to reduce the concentration to 10 %?

Which of the following will result in a chemical change? A. Evaporating alcohol into vapor B. Drying wood in a shed C. Melting ice to obtain water D. Burning coal in a furnace

If 27.3 mL of 0.293 M HBr solution completely neutralizes 42.6 mL of NH3, what is the concentration of the NH3 solution? NH3 + HBr yields NH4Br 0.188 M 0.387 M 0.586 M 2.18 M

What term refers to how fast blood traveled from it source

A sample contains 430 mg of mercury. How many significant figures are in the number?

What is the percent composition of K2O?

Name two liquids that were acidic and their approximate pH's. Name two that were basic and their approximate pH's. 4. What were the most neutral 2 or 3 liquids? 5.

Which energy carries are formed by light dependent reaction