Notes

SCIENCE EXAM/QUIZ GUIDE

1.How many groups are there in periodic table of elements?
ANSWER: 18

2.How many elements are there in your periodic table?
ANSWER: 118

3.How many periods are there in your periodic table?
ANSWER: 7?(NOT SURE)

4.How is periodic table organized?
ANSWER: By atomic number?(NOT SURE)

5.Why is elements 57-70 found seperately at the bottom of the periodic table?
ANSWER: Because those elements exhibit different properties

6.What are mettaloids? Give examples
Carbon, Aluminum, Selenium, Polonium, Astatin

7.What does bold line like staircase found in the right side of the periodic table mean?
ANSWER: Indicates position of mettaloids in periodical table

8.What is the trend as you move left to right of a periodical table regarding the ability of atoms to attract electrons to itself?
ANSWER: The electron affinity gradually increases

9.What is the trend as you move left to right in a period regarding the amount of energy required?
ANSWER: Ionisation energy across a period

10.What is the trend as you move left to right of a periodic table regarding the ability of atom to attract electrons to itself?
ANSWER: The electronegativity of atoms increases

TEST 2: Arrangement of periodic table

Helium: He, 1, 1, Noble gas
Magnesium: Mg, 3, 2, Alkaline earth metal
Cadmiun: Cd, 5, 12, Metal?(NOTSURE)
Xenon: Xe, 5, 18, Noble gas
Seaborgium: Sg, 7, 6, Transition metal

TEST 3: Using the period table, arrange the elements according to the trend being required
A. Arrange the following elements according to decreasing ionization energy.
1: PERIOD 6: Ba, Re, Pt, Au, Po
2: PERIOD 5: Rh, Sr, Y, Te, Sn
PERIOD 6 ANSWER: Au, Pt, Po, Re, Ba
PERIOD 5 ANSWER: Te, Rh, Sn, Y, Sr

B. Arrange the following elements according to increasing electron infinity
3. GROUP 15: Bi, As, N, P
4. GROUP 1: Na, Fr, Li, K
5. GROUP 2: Be, Ba, Mg, Sr
GROUP 15 ANSWERS: N, P, As, Bi
GROUP 1 ANSWERS: Fr, K, Na, Li
GROUP 2 ANSWERS: Be, Mg, Sr, Ba

TEST 4. COMPARE AND CONTRAST THE FF
1. Physical and Chemical property
ANSWER: Chemical properties are properties that can be observed or measured when a substance undergoes a chemical change. Physical properties are properties that can be observed without bringing a chemical change

2: Physical and chemical change
ANSWER: Chemical change has a change of composition in the substance, A physical change has a difference in appearance or smell.

3. Intensive and Extensive
ANSWER: an extensive quantity is one whose magnitude is additive for subsystems, While an intensive quantity does not depend on system size or amount in the system

4. Solid, Liquid, Gas
ANSWER: Solid is something u can touch or something that has definitive shape or volume. A liquid has definitive volume as well but takes shape of a container/water bottle. Gas is something u cant touch because it lacks either definitive shape or volume.