20. What is the area of a piece of metal foil that measures 43.9 cm by 29.21 cm? Express the answer to

the correct number of significant figures.

a. 128 cm2

b. 1280 cm?

1280.3 cm?

d. 1280.32 cm

128.0319 cm?

C.

e.

If you have a gold brick that is 2cm by 3cm by 4cm and has density of 19.3g/cm3, what is its mass?

Check all the boxes that properly complete each statement. See the syllabus section of the Lab Manual. (a) Absences in CH202 are excused for ... documented death in immediate family. mild sniffles, coughs, or headaches.

What principal quantum number refers to:

A toy that is green under white light is illuminated by blue and green light, what color do you perceive?

Use the E0 values of the following elements: Zn, Cu, Pb, and Al. Which element is the most active reducing agent?

Which of the following is NOT true of nitrogen fixation? (A) it is a process that occurs exclusively in some species of prokaryotes (B) it sometimes occurs in bacteria that are mutualistic symbionts in plant roots (C) it is the metabolic process

What two pieces of information do u need to describe force

Why are the atomic masses for most elements not whole numbers?

An aqueous solution is 0.387 m in hcl. what is the molality of the solution if the density is 1.23 g/ml?

Carbon monoxide reacts with oxygen to form carbon dioxide. 2 CO (g) + O2 (g) → 2C02 (8) In a 1.00 L flask, 3.40 atm of CO reacts with 2.60 atm of O2. Assuming that the temperature remains constant, what is the final pressure in the flask? 4.30 atm 2.