The half-lives of isotopes are all measured in millions of years.

a. True

b. False

Which pair of elements have the same amount of valence electrons lithium, beryllium, sodium, magnesium

Which particles in an atom can increase or decrease in number without changing the identify of the elements?

At what temperature celsius will 19.4g of molecular oxygen, o2, exert a pressure of 1820mm hg in a 5.12th cylinder?

Consider the titration of 30.0 mL of 0.050 M NH3 with 0.025 M. HCl. Calculate the PH after the following volumes of titrant have been added 0 ml 20 mL 59.1 mL 60.0 mL 71.4 mL 73.4 mL

A 100.0 ml sample of 0.18 m hclo4 is titrated with 0.27 m lioh. determine the ph of the solution after the addition of 100.0 ml of lioh.

Write the net ionic reation for the neutralization of hcl by naoh. calculate hrxn for reaction from the enthepies of formation of the reactiom and product

Can you zooley answers.

Select all that apply. Based on the properties that change in a chemical reaction, which are examples of chemical changes? baking a cake burning firewood leaf color from summer to fall shredding paper

Chemistry is the study of matter true or false

Which of the following reactions are redox reactions? a. Al (s) + 3Ag + (aq) →Al3 + (aq) + 3Ag (s) b. SO3 (g) + H2O (l) →H2SO4 (aq) c. Ba (s) + Cl2 (g) →BaCl2 (s) d. Mg (s) + Br2 (l) →MgBr2 (s)