Express each of the following to four significant figures 3983.4

444.18

189100

33100

6.302*10-4

5.0472*10-4

Describe the basic particle from which all elements are made

Which two structures would provide a positive identification of a plant cell under a microscope? Answers: 1. plasma membrane, large central vacuole 2. cell wall, mitochondria 3. cell wall, chloroplast 4. ribosomes, chloroplasts

What is a substance which allows the red blood cells to carry oxygen and iron.

A fuel scientist burnt a piece of coal and a piece of wood to compare the amount of heat given off by each.

A lithium ion has a charge of

How many of the following compounds are soluble in water? Cu (OH) 2

Mg is a member of which family? a) noble gases b) halogensc) alkaline earth metals d) alkali metalse) none of the above

How does an atom differ from a molecule?

Which of the following statements is true? a. Ag (s) reacts spontaneously with 1 M H + (aq). b. Ag (s) reacts spontaneously with Ni2+. c. Ag (s) reacts spontaneously with 1 M NO3 - in 1 M H + (aq). d.

A 2.950Ã-10âˆ'2 M solution of glycerol (C3H8O3) in water is at 20.0∘C. The sample was created by dissolving a sample of C3H8O3 in water and then bringing the volume up to 1.000 L.