20. Which of the following is NOT true for the atoms 13N, 14N, and 'N?

a. They all have the same mass number.

b. They are isotopes.

c. They all have the same atomic number.

d. They all have 7 protons.

e. They all have 7 electrons.

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When you squeeze an air-filled ball, why is that it returns to its original position when you let go?

A certain rock contains 71% orthopyroxene, 20% olivine and 8% clinopyroxene. Name this rock and describe it's provenance.

16g of O2 14g of N2 8g of CH4 1g of H2 Assuming ideal conditions, which statement is true of these samples of gases? A) They are listed in order of decreasing number of moles. B) They are listed in order of increasing number of particles.

When 90 g of water is split by electrolysis (2H2O → 2H2 + O2) at STP, how many liters of oxygen gas will be collected? Question 6 options: 44.8 L 22.4 L 56.0 L 67.2 L

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)

Consider the following half-reactions: Half-reaction E° (V) I2 (s) + 2e - 2I - (aq) 0.535V 2H + (aq) + 2e - H2 (g) 0.000V Zn2 + (aq) + 2e - Zn (s) - 0.

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