Which of these is an example of a chemical change?

ironing a shirt

grinding powder

melting cheese

fireworks exploding

What is conjugate solution

Which of the following has highest first ionization potential among Ne, Mg, Cl and Na

What happens to the concentration of both components in the system as volume decreases? N2O4 (g) 2NO2 (g) both increase NO2 less; N2O4 greater NO2 greater; N2O4 less both decrease

For the process described, compare ΔH with ΔE of the system. A solid yields a mixture of gases in an exothermic reaction that takes place in a container of variable volume. A. ΔH is less than (more negative) Δ E of the system. B.

Earth's solar constant a. is actually variable. b. refers to the intensity of solar radiation that reaches Earth's surface. c. is about 0.5 calories per square centimeter per minute. d. must be measured at perihelion. e. must be measured at aphelion.

Atoms of which element have the greatest tendency to gain electrons? (1) bromine (3) fluorine (2) chlorine (4) iodine

Technetium-99 is used for brain scans. If a Laboratory receives a shipment of 200 g of this isotope, how much will remain after 24 hours? The Half-Life of Technetium-99 is 6 hours.

The factor that affects how easily an electron can be removed from an atom is the.

Write the half-reactions as they occur at each electrode and the net cell reaction for this electrochemical cell containing tin and silver: sn (s) |sn2 (aq) ||ag (aq) |ag (s)

2HCI + Na, so, - 2NaCl + H, so, How much H, so, is produced when 40.0g of HCl react? ОА 107.60 в 36.5 g с 08.1 g O D53.8 g