Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CHE 103 > Midterm > Flashcards

Midterm Flashcards

1
Q

What are the states of matter?

A

Solid, Liquid, Gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Liquid

A

no definite shape, but have a definite volume, able to flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Solids

A

definite shape and volume not compressible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Gas

A

no definite shape or volume, molecules very far apart

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Elements

A

the simplest type of substance with unique physical and chemical properties. Consist of only 1 atom that cannot be broken down into simpler substances by chemical or physical means

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Compounds

A

a structure that consists of two or more atoms that are chemically bound together thus behaves as an independent unit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

heterogeneous

A

consists of two or more phases of variable composition that differ in properties (ie. oil floating in water)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Homogeneous

A

has the same properties and composition throughout the sample. (ie. saltwater to brine is a homogeneous aqueous solution)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Who created the periodic table?

A

Dmitri Mendeleev

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

physical properties

A

properties measured without changing the chemical composition of the substance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Chemical properties

A

substances potential to react with some other substances in its enviornment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

mass

A

measure of the amount of matter in a sample

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Volume

A

measure the amount of space the matter takes up

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Density

A

the ratio of an object’s mass to its volume

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Weight

A

based on gravity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

All non zero numbers are (BLANK)

A

significant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Zeros in between digits or numbers are (BLANK)

A

significant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Trading zeros are significant when there is a decimal (BLANK) them

A

before (ie. 505.400 has 4 sig figs)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Leading zeros are (BLANK)

A

not significant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Hoe many sig figs. are in 0.00751

A

3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Zeros at the end of digits, when their is no decimal point are (BLANK)

A

ambigious

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

10000 has how many sig. figs.

A

1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

672001 has how many sig. figs.

A

6

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

For addition, subtraction, multiplication and division. your answer should have (BLANK) number of decimal points

A

fewest (ie. 7.821- 2.1 = 5.7)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

When using sig. figs in math round (BLANK)

A

the final answer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

accuracy

A

how close a measurement is to the real value

27
Q

precision

A

reproducibility or how close the measurements are to each other

28
Q

What is Aristotle’s theory on matter and atoms?

A

proposed an continuous model of matter without atoms

29
Q

The law of conservation of mass

A

mass is neither created nor destroyed in a chemical reaction but merely changes form

30
Q

law of definite proportions

A

a compound is always made up of the same relative masses of elements that composed it.

31
Q

What does forensic science deal with

A

the application of science to legal matters and crime solving

32
Q

which of the following states of matter is generally considered the most ordered?

A

solid

33
Q

copper sulfate, CuSO4, is sometimes used to create the blue color in toilet water. Copper sulfate is an example of what?

A

a compound

34
Q

Pure substances

A

have a uniform composition and cannot be separated by physical methods

35
Q

The mobile phase in thin-layer chromatography is often

A

a liquid such as water

36
Q

to whom does credit for the creation of the periodic table go?

A

Dmitri Mendeleev

37
Q

Which element uses the symbol Na

A

Sodium

38
Q

What atomic symbol corresponds to iron

A

Fe

39
Q

Which of the following atomic symbols represents the coinage metals, copper, silver, and gold.

A

Cu, Ag and Au

40
Q

Which of the following elements are metals?

A

Iron, lead, calcium

41
Q

In the case study described in Chap 1 why didn’t Agent Rawalt believe the Mexican government’s claim about the death of the informant?

A

The color of the soil from the bodies didn’t match the color of the soil from the ranch they were supposedly found

42
Q

Which of the following measures how much matter is contained in a simple?

A

Mass

43
Q

What is the difference between mass and weight

A

Weight is a measure of the pull of matter to the earth, while mass is a measure of how much matter is in a sample

44
Q

How many sig. figs. are there in the number 0.00204

A

3

45
Q

How many sig. figs. does 23.120 have

A

5

46
Q

Good accuracy and good precision in three measurements means that all three have what in common

A

value close to each other and close to the true value

47
Q

When a material floats in water, what is its density

A

less than 1.0 g/mL

48
Q

What 2 measurements determine density, and in what relationship to each other?

A

mass divided by volume

49
Q

What is the density of a material with a mass of 23.9g and a volume of 27.5 mL

A

0.869 g/mL

50
Q

How did Pitera’s shovel provide evidence of his burying bodies?

A

The shovel still had soil on it specific t the burial site

51
Q

DNA evidence cannot be used to identify remains in a funerary urn, for what reason?

A

Cremation destroys all DNA

52
Q

The continuous model of matter, postulated by Aristotle, believed in what is the smallest material

A

nothing was; matter should be able to be divided over and over.

53
Q

The law of conservation mass states

A

mass is neither created nor destroyed in a chemical reaction, but merely changes form.

54
Q

What is the mass of the missing material in the following equation? (BLANK) g carbonic acid (22.0g CO2 + 9.0 g H2O)

A

31.0 g

55
Q

According to Daltons Atomic Theory, how do atoms combine?

A

in whole number ratios

56
Q

The compounds NO and NO2 represent which of the postulates of Daltons’ atomic theory?

A

Atoms combine in simple, whole number ratios to form compounds

57
Q

Which sub-atomic particle has a positive charge

A

proton

58
Q

Rutherford’s gold foil experiment proved what the matter?

A

That it has regions of dense, positive charge.

59
Q

How are two samples of an element referred to when they possess differing numbers of neutrons?

A

as isotopes

60
Q

What is the ground state of an atom

A

the state in which all electrons are in the lowest possible energy level.

61
Q

An electron that has been pushed into a higher energy level is said to be in what state?

A

an excited state

62
Q

What is the orbital of an electron?

A

the region of space with the highest probability of finding the electron

63
Q

An s orbital has what shape

A

spherical

64
Q

How could forensic chemists tell if a sample from the inside of a funerary urn was cement instead of human ashes?

A

The percentage of silicon was much higher in cement (about 19%) than in human ashes (about 1%)

CHE 103 (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions