An element has 4 protons, 5 neutrons, and 4 electrons. What is the atomic mass of the element?

4

5

8

9

Which number is equal to the number of protons in the atom?

When 45 g of an alloy, at 25oC, are dropped into 100.0 g of water, the alloy absorbs 956 J of heat. If the final temperature of the alloy is 37oC, what is its specific heat?

Is it true that our diaphragm drain our oxygen to lungs?

Consider the anion whose charge is 2 - and whose electron configuration is identical to argon. what is the symbol for this anion

Which statement describes chemical reactions that take place at different rates? A. One reaction produces more products than the other. B. One reaction begins with more reactants than the other. C.

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.

Where did the longest tsunami form?

Calculate the number of H atoms in 0.190 mole C 6 H 14 O .