19. B is the chemical symbol of which element?

Boron

Boring

Balkite

Beryllium

20. Zinc (Zn) has an atomic number of 30 and an atomic mass of 65. How many neutrons does a stable atom of Zn have?

30

35

60

95

Give the charge and full ground-state electron configuration of the monatomic ion most likely to be formed by each element. p a. p3â: 1s22s22p63s23p3 b. p4â: 1s22s22p63s1 c. p3â: 1s22s22p63s23p6 d. p4â: 1s22s22p63s23p64s1 e. none of these

Given that the pka for the imidazole ring of a histidine has a pKa of 6.5 how many histidine side chains will be charged at a pH of 7.2?

How many kilograms of water can be evaporated from a 1 m2 surface of water in a lake on a hot, clear summer day, if it is assumed that the limiting factor is the Sun's heat of 1800 Js-1m-2 for an 8-hour day?

How many grams of ZnO would you need to produce 50 g of ZnCl2? (The atomic mass of Zn is 65.38 and of Cl is 35.45.) ZnO (s) + 2HCl (aq) → ZnCl2 (s) + H2O (l) 17.1 g 29.8 g 59.7 g 83.8 g

The various tropisms in plants are caused by localized areas of

The pyruvate dehydrogenase complex converts pyruvate to acetyl coenzyme A, abbreviated acetyl CoA, which can then enter metabolic pathways such as the citric acid cycle.

When the moon is farthest from the sun and viewed from earth, the moon appears to be a ... ?

How much uranium was used in the first atomic bomb?

How many grams of chromium are required to react with 125ml of 0.75m cuso4?

Of the following, which does NOT have bilateral symmetry? a. Humans b. Frogs c. Fish d. Jellyfish