1/2 Of Study Guide

Question 1

The variable that is observed during and experiment is called what type of variable?

Answer 1

Responding

Question 2

In the Bohr model of the atom, an electron in an orbit has a fixed

Answer 2

Energy

Question 3

Which of the following does not describe the liquid state?

Answer 3

Particles vibrate in fixed positions

Question 4

What is the electron configuration of potassium

Answer 4

*exponents count to 19

Question 5

Which of the following is not a characteristic of most ionic compounds?

Answer 5

They have slow melting points

Question 6

What is the net charge of the ionic compound calcium fluoride

Answer 6

0

Question 7

When multiplying and dividing measured quantities, the number of significant figures in the result should be equal to the number of significant figures in

Answer 7

The least precise measurement

Question 8

If the spin of one electron in an orbital is +1/2 what is the spin of the other electron in that orbital?

Answer 8

-1/2

Question 9

A compound held together by ionic bonds called a

Answer 9

Salt

Question 10

What are quanta of light called

Answer 10

Photons

Question 11

The natural distribution of the isotopes element is 60.795% at a mass of 281.99481 amu, 22.122% at a mass of 283.99570 amu, and the remainder has a mass of 286. 99423 amu. Calculate the atomic mass of the element

Answer 11

283.29 amu

Question 12

What is the wavelength of an electromagnetic wave that travels at 3x10^8 m/s and has a frequency of 60 MHz? (1 MHz=1,000,000 Hz)

Answer 12

300,000,000 m/s // 60,000,000

Question 13

Most methods for separating mixtures into their components depend on which of the following?

Answer 13

Differing physical properties among the components

Question 14

The graph below represents the temperature versus energy plot for a pure substance. Identify the points….

i. Where only gas exists
ii. Associated with the heat of fusion

Answer 14

(i) 7

(ii) 2 and 3

Question 15

Which of the following was NOT among Democritus’s ideas?

Answer 15

Atoms retain their identity in a chemical reaction

Question 16

Which of the following statements is true about ions?

Answer 16

Cations are formed when an atom loses electrons

Question 17

Which of the following is a physical change?

Answer 17

Evaporation

Question 18

Calculate the density of copper given that a 35.4 cm^3 block of the pure metal has a mass of 316g

Answer 18

8.93 g/cm^3

Question 19

Why is the second ionization Energy greater than the first ionization Energy?

Answer 19

It is more difficult to remove a second electron from an atom

Question 20

A substance that forms a vapor is generally in what physical state at room temperature

Answer 20

Liquid or solid

Question 21

What is the shape of the 3a atomic orbital

Answer 21

Sphere

Question 22

Which of the following substances is/are homogeneous?

i. Mineral oil
ii. A plant leaf
iii. Sausage
iv. Sugar
v. Freshly squeezed lemonade

Answer 22

i and iv

Question 23

Isotopes of the same element have different

Answer 23

Mass numbers

Question 24

The P in the symbol 4p^3 indicate the

Answer 24

Orbital shape

Question 25

Atomic mass of an element is the

Answer 25

Weighed average of the masses of the isotopes of the element

Question 26

The heat capacity of an object depends in part on its

Answer 26

Mass

Question 27

As a consequence of the discovery of the nucleus by RutherFord which model of the Adam is thought to be true?

Answer 27

Electrons are distributed around the nucleus and I keep I am almost all the volume of the Atom

Question 28

Which statement is true about electronegativity?

Answer 28

Electronegativity generally increases from left to right across a period

Question 29

The nuclear symbol of an isotope of potassium is 41 K 19. Indicate the number of protons number of neutrons, atomic number, and mass number of the isotope

Answer 29

19 protons 22 neutrons 19 atomic number 41 mass number

Question 30

To what category of elements does an element belong if it is a good conductor of electricity

Answer 30

Metals