Identify the atom it has 19 protons 19 electrons and 17 neutrons and a mass of 39 amu

Which of the following include exact numbers? (a) The speed of light in a vacuum is a physical constant; to six significant figures, it is 299792 x 108 rnis. (b) The density of mercury at 25'C is 13.53 g/rriL. (c) There are 3600 s in 1 h.

How many grams of Calcium are present in 33.0 g of Calcium Fluoride, CaF2?

A. A balloon with a volume of 1L is filled with a gas that has a pressure of 4 Pa. What is the new pressure of the gas if the balloon is squeezed down to a volume of. 6L? (Step by Step explanation)

Classify the following change as physical or chemical: A match lights when struck. A. Physical change B. Chemical change

Wine goes bad soon after opening because the ethanol in it reacts with oxygen gas from the air to form water and acetic acid, the main ingredient of vinegar. What mass of ethanol is consumed by the reaction of 3.37g oxygen gas?

The specific gravity of iron is 7.87, and the density of water at 4.00 ∘C is 1.00 g/cm3. You can use this information to find the density of iron. Find the volume occupied by 4.50 g of iron.

The volume of a gas is 93 ml when the temperature is 91? c. if the temperature is reduced to 0? c without changing the pressure, what is the new volume of the gas?

15.434 g of kcl (m. m 74.55 g/mol) is dissolved in water up t a total volume of 500.0 mL. the density of this solution is 1.02 g/mL. what is the concentration of he solution in molality

Determine the molar mass of an unknown monoprotic acid to two decimal places if 20.01 ml of a 0.098 m naoh solution were used to titrate 0.215 g of the unknown acid

A diatomic molecule with a triple covalent bond is A. H2 B. N2 C. O2 D. Br2 (P. S. The answer turned out to be B. N2)