Midterm Review Test Questions – Flashcards

Unlock all answers in this set

Unlock answers
question
Burning of paper
Physical or chemical change
answer
Chemical
question
Dissolving of sucrose
Physical or chemical;
answer
physical
question

Which substance is an organic molecule?

H2O

NaCl

CuSO4

C2H5OH

answer
C2H5OH
question

What state of matter is bromine at 65oC?

Melting Pt = -7oC

Boiling Pt = 59oC

answer
Gas
question

What property of matter was the chromatography lab based on?

 

answer
Solubility
question
What type of mixture is salt water?
answer
Homogeneous
question

What type of mixture can be filtered?

Homogeneous or heterogeneous

answer
Heterogeneous
question
A substance that cannot be broken down by any physical or chemical means is ...
answer
Element
question

In the reaction;

2 H2   +    O2   -->     2 H2O

How much water would form if 18 grams of H2 react with 144 grams of O2?

answer
162 grams
question
What scientific law is used in the previous example?
answer
Law of Conservation of Mass
question
The fact that sodium explodes in water is an example of what type of property?
answer
Chemical
question
Distillation is a process that separates a mixture of liquids based on what property?
answer
Boiling point
question

Round off the numbers to 3 significant figures:

57.023

 

450.00896

 

5.78  x  105

answer

57.0

 

40.0

 

5.78 x 10

question

How many significant digits are in each of the numbers?

a)123.006

 

b)0.00120

 

c) 1.76  x  103

answer

 

a)  6    [123.006]

 

b) 3   [0.00120]

 

c) 3   [1.76  x  103]

question

What is the answer to the correct number of significant digits?

 

12.011   +   2.5

answer

14.5

Because the 2.5 has only 1 decimal which determines the S.F. in an addition/subtraction problem

question

What is the answer to the correct number of significant digits?

 

25.55   /   5.0

answer

 

5.1 

because the 5.0 has only 2 S.F. which is the determining factor when multiplying or dividing

question
Convert  14.2 cm to kilometers
answer
.000142
question
How many nanometers in 6 mm?
answer
6,000,000
question

A car travelling at 65 mph is travelling how many Km per min?

 

(1 mile = .6 Km)

answer

1.73 km/min

 

65mph   x  1.6 km/mi   x  1 hr/60 mins

 

question
What part of Dalton's atomic theory has been amended?
answer

Atoms are now divisible.

 

AND

 

Atoms of the same element can have different atomic masses.

question
What subatomic particle is a cathode ray made of?
answer
Electrons
question

What particle did Rutherford aim at gold foil?

What does the particle consist of?

answer

Alpha beam

2 protons and 2 neutrons

(a Helium nucleus)

question
How many protons, neutrons and electrons are in the element   P - 32?
answer
15 protons, 15 electrons, 17 neutrons
question
Write the symbol for an isotope of  Si -14?
answer
Si-15 or Si-16
question
According to the band of stability, what particles are in a 1:1 ratio, then a 1:1.25 ratio for atomic stability?
answer
1 proton to 1 or 1.25 neutrons
question
What particle determines the identity of an element?
answer
Number of protons
question
What particle determines the chemical reactivity of an element?
answer
Electron
question
What are the sublevels in the 4th pricipal energy level?
answer
s, p, d, f
question
What is the maximum number of electrons in the "d" sublevel?
answer
10
question
What part of the Periodic Table has the "d" sublevel filling in?
answer
Transition Metals
question
What is the electron configuration of Si?
answer
1s22s22p63s23p2
question

Identify the element:

 

1s2 2s2 2p6 3s2 3p6 4s2 3d1

answer
Scandium
question

What must be true of electrons in the same orbital?

 

answer
They have opposite spins
question
What are the orbital orientation in the "p" sublevel?
answer
px  py  pz
question
Why does hydrogen get placed with the alkali metals on the periodic table/
answer
Because it has 1sas its electron configuration
question
What atomic property explains why the noble gases are inert?
answer

The noble gases have a stable octet 

s2p6

question
What is the trend for Ionization energy across a period?
answer
Ionization energy increases across a period.
question
Explain the Ionization energy trend.
answer
Going across a period the nuclear charge increases while the electron shielding stays the same so it is harder to remove the electron.
question

which has the larger atomic radius

Al or Cl?

answer
Cl
question

Which has the larger Ionization Energy

 

Na or Rb

answer

Na

Because it has less electron shielding

question

How many electron shields are present in an atom of 

Bromine?

answer
3
question

Name the compound

Na3P

answer
Sodium phosphide
question

Write the formula for

dinitrogen pentaoxide.

 

Is it an ionic compound?

answer

N2O5

No - because it is composed of 2 nonmetals.

question

Name the compound

 

Mg CO3

 

What type of compound is it?

answer

magnesium carbonate

 

an ionic compound

question

What type of element is this

 

It has a shiny luster, is malleable and conducts electricity

answer

 

metal

question

This element has an incomplete "d" sublevel,

Where is it on the periodic table?

answer
Transition Metals
question

This element has the outer energy level

s2 p 6

What family is it?

answer
Noble Gases
question
This element has 5 electrons in the outer 4th energy level?
answer

 

Arsenic 

question
This is the only positive polyatomic ion
answer
Ammonium   NH4
question

Is this electron configuration "excited"

 

1s2 2s2 2p6 3s2 3p6 4s2 4p1

answer

 

Yes - because the last electron should fill in 

3d1

question

What is the frequency of a blue light with a wavelength of 450 nm?

 

answer

3 x 108 m/sec =  wl x (450 x 10-9)

 

6.66 x 1014  Hz

question
Which type of electromagnetic radiation has the shortest wavelength?
answer
Gamma
question
What part of the electromagnetic spectrum has the highest frequency?
answer
Gamma
question
What part of the electromagnetic spectrum do we use for cooking?
answer
Microwaves
question

What is amount of energy in light with a frequency of 

4.5 x 1014 Hz?

answer

E = h Freq

(Panck's constant)

 

(6.626 x 10-34 ) x (4.5 x 10 14)

 

2.98 x 10-19  joules

question
What is the difference between an extensive and intensive property?
answer
Extensive properties deal with the amount of a substance while intensive properties are specific to the material.
question
Give example of an intensive property.
answer

Density

Boiling point

Melting Point

 

question

Tell the number of protons, neutrons, and electrons in the following;

 

Cl - 35

answer

Cl - 35

 

Protons 17

Neutrons - 18

Electrons - 17

question

Tell the number of protons, neutrons, and electrons in the following:

 

28   +3

Al

13

 

answer

Protons - 13

Neutrons - 15

Electrons - 10

question

 Which is  an example of an isotope for

 

35 Br - 80

answer

34 Se - 80

 

80 Hg - 200

 

35 Br - 81

question

In the nuclear reaction;

 

U-238 -->  Th 234  +  ____

 

what is the other product?

answer

 

Alpha particle

 

4- He - 2

question
which particle results in the product's atomic number increasing by 1?
answer

 

Beta

 

    -1

e

o

Get an explanation on any task
Get unstuck with the help of our AI assistant in seconds
New