Can matter every be destroyed? Why or why not?

A sample of helium occupies 0.56 L at 988 mm Hg and 25 celsius. If the sample is transferred to a 1.0L flask at the same temperature, what will the gas pressure be in the new flask? Solve using Boyle's Law

Which balanced equation represents an endothermic reaction? (1) C (s) + O2 (g) → CO2 (g) (2) CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) (3) N2 (g) + 3H2 (g) → 2NH3 (g) (4) N2 (g) + O2 (g) → 2NO (g)

The electrical conductivity of an aqueous solution depends on the concentration of which particle in the solution

Lowering an object decrease is potential

Which change occurs at the anode in an operating electrochemical cell? 1: gain of protons 2: gain of electrons 3: loss of protons 4: loss of electrons

A certain ore is 34.4% nickel by mass. How many kilograms of this ore would need to dig up to have 30.0g of nickel?

Are the chemical reactions that take place when a battery connected endothermic or exothermic

What are 3 properties of carbon?

A (1. pathogen 2. Germ 3. Bacterium) is an agent that causes disease. All (1. bacteria 2. fungi 3. Viruses) are pathogens.

Calculate the solubility (in g/l) of calcium fluoride in water at 25°c if the ksp for caf2 is 1.5 * 10-10.