The mass number of an element is equal to

a. the total number of electrons.

b. the sum of the protons and neutrons.

c. less than twice the atomic number.

d. a constant number for the lighter elements.

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.