What is the length of decay of carbon-14?

a. A couple days

c. A couple seconds

b. A couple hours

d. A few thousand years

Why is the second ionization energy of any element higher than its first ionization energy?

Which best describes a mixture? It has a single composition, and it has a set of characteristics that does not change. It can have different compositions, but it has a set of characteristics that does not change.

Using a handbook, look up up the formula and structure of potassium hydrogen phthalate (khp) used to standardize the solution of naoh in this experiment. calculate the molar mass of kph.

Answer = 3) How many moles are there in 454 g of carbon? How many atoms is this? 1 mol = - 8C 1 mol = atoms C Answer=

10. NH3 + N2O - --> N2 + H20

Correctly identify the generic formula for a synthesis reaction. a. AB + A+B b. A+B → AB c. CxHx + O2 → CO2 + H2O d. AB + C + AC + B e. AB + CD → AD + CB

Zinc phosphide, Zn3P2, is often used as a rat poison. Phosphorus has 5 valence electrons. How many valence electrons does each zinc atom lose?

Nonrenewable resources are?

Watch the animation, then check off the samples that will conduct electricity. Check all that apply. View Available Hint (s) Check all that apply. NaCl solution Solid NaCl Solid sugar Sugar solution

Burning wood represents a chemical change. True or False?