BIOA01H3 Chapter 2: Chapter 2 Study Guide

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20 Nov 2010

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N all matter is composed of atoms j protons, neutrons, and electrons. N the mass of a proton serves as a standard unit of measure called the atomic mass unit or dalton (1. 7e-24 g) N an element is a pure substance that contains only one kind of atom. N 98% of the mass of a living organism is composed of six elements: carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulphur. N atomic number j number of protons in an atom. N mass number j the total composition of protons and neutrons in the nucleus. N atomic weight j average of mass numbers of isotopes in their normally occurring proportions. N radioisotopes are unstable isotopes, and thus spontaneously give off energy in the form of. Isotopes of an element have the same number of protons but different number of neutrons alpha, beta, or gamma radiation. N the radioactive decay transforms the atom, including the atomic number.

Related Questions

Which of the following is true?

A. Atomic weight is determined by the number of electrons in an atom of a given element.

B. Atomic weight is determined by the number of protons in an atom of a given element.

C. The reactivity of an atom is based on the number of electrons in its outer valance.

D. The chemical reactivity of an atom is based on the overall number of electrons in the atom.

Thanks.

1. (TCO 1) Control subjects in a double-blindtest of a new drug are (Points : 4) informed of what drug they aregetting.
informed of what drug they aregetting but their private physicians are not.
given larger doses of thedrug.
infected with a differentdisease than the experimental subjects.
not given the experimentaldrug but are otherwise treated the same as the experimentalsubjects.

Question 2. 2. (TCO 1) My dog will eat more ofher food when I pour bacon grease over the food before I give it toher. This is an example of a(n) _____. (Points : 4)

observation
hypothesis
experiment
theory
All of the above

Question 3. 3. (TCO 1) Deductive reasoning isused to make _____ based on a hypothesis. (Points : 4)

data
theories
statistical tests
correlations
predictions

Question 4. 4. (TCO 2) Which of the followingstatements about the periodic table is incorrect? (Points : 4)

A period is a horizontal rowon the periodic table.
A group is a column on theperiodic table.
The elements in each periodhave similar chemical properties.
The A groups contain therepresentative elements.
The B groups contain thetransition elements.

Question 5. 5. (TCO 2) How do you find themass number of an atom? (Points : 4)

Add up the number of protons,electrons, and neutrons in the atom.
Add up the number of protonsand neutrons in the atom.
It is equal to the number ofprotons in the atom.
It is equal to the number ofneutrons in the atom.
Find the net electrical chargeof the atom.

Question 6. 6. (TCO 2) An isotope of potassiumhas a mass number of 39. How many neutrons are present in thisisotope? (Points : 4)

19
20
24
44
58

Question 7. 7. (TCO 2) Which particles arefound in the nucleus of an atom? (Points : 4)

Only neutrons
Protons and electrons
Protons and neutrons
Only electrons
Only protons