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Chemistry Ch. 1-2 Flashcards | StudBud
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Chemistry Ch. 1-2
What is precision?
An example of a homogenous mixture is
Chemistry Ch. 1-2
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1
An example of a homogenous mixture is
chocolate chip cookie
Italian dressing
kool-aid
mud
2
What is precision?
Differ widely from actual value
Measurements that are the same
Measurements agree closely
The actual value
3
A blend of two or more kinds of matter, each of which retains its own identity and properties, is a(n)
conversion factor
pure substance
compound
mixture
4
Chemistry is a natural science that deals with the study of
the composition, motion, and relative positions of stars and planets
the composition, structure, properties, and changes of matter
the physical features of Earth
living things and their life processes
5
The elements that are horizontal are called periods
False
True
6
Slicing a loaf of bread is a physical change
True
False
7
If two quarantines are inversely proportional, when one quantity increases by 10 percent, the other
increases by 10
may increase at a different rate
decreases by 10
stays the same
8
When atoms of two or more elements are chemically bonded, the substance formed is a(n)
mixture
atom
compound
conversion factor
9
An example of an extensive property is
boiling point
color
mass
density
10
To change from one unit to another, you must first determine the appropriate
mass
volume
pure substance
conversion factor
11
Identify as a chemical or physical change when dissolving sugar in water
chemical
physical
12
The state of matter that has a definite mass is
gas
liquid
mixture
solid
13
The two properties that all matter has in common are
volume and weight
mass and volume
mass and weight
volume and shape
14
The state of matter in which a material has a definite volume and a definite shape is
solid
mixture
gas
liquid
15
In the periodic table, elements in the vertical columns together form a(n)
together
group
period
product
16
Identify as a chemical or physical change when decomposing mercury(II) oxide
chemical
physical
17
Water boiling at 100.0 C is an example of a(n)
chemical change
physical property
extensive property
chemical property
18
If a material is tested and every sample has exactly the same properties and the same composition it is a(n)
physical change
conversion factor
pure substance
chemical change
19
Sun to Earth=150 million km. Light speed=3.0 x 10^8 m/s. Dividing distance by speed then multiply meters in km=what unit
meters per second
seconds
kilometers squared
kilometers per second
20
A Florence flask contains 250. mL of liquid. Express in scientific notation, the capacity of the flask in liters is
2.5 x 10^-1 L
2.50 x 10^-1 L
2.500
25.0 x 10^2 L
21
What is 300000 km/s in scientific notation?
3.00 x 10^5 km/s
3.1 x 10^6 km/s
3 x 10^5 km/s
3.0 x 10^4 km/s
22
A mixture that has the same proportion of components throughout is called
heterogenous
homogenous
pure substance
factor
23
An element that has some characteristics of metals and some characteristics of nonmetals
carbon
oxygen
metalloid
mixture
24
The substances that are formed by a chemical change are called the
volume
products
factors
substance
25
Which process is a chemical change?
dissolving in alcohol
heating to boiling
burning in air
slicing into two pieces
26
An example of a heterogenous mixture is
mud
salt
air
nitrogen
27
The four major stages of the scientific method are
observing, generalizing, theorizing, and formulating hypothesis
collecting data, predicting, test hypotheses, and theorizing
observing formulating hypotheses, testing hypotheses, and theorizing
observing, generalizing, theorizing, and testing hypotheses
28
In addition and subtraction, the answer must not have more significant figures than the
number in the calculation with the largest decimal places
number in the calculation with the fewest decimal places
average number of decimal places in the problem
total number of decimal places in the problem
29
The measurement that has only nonsignificant zeros is:
60.0 mL
400. mL
506 mL
0.0037 mL
30
Which process is a physical change?
chemical reaction between oxygen and hydrogen to produce water
melting candle wax
frying an egg
burning paper
31
The state of matter in which a material has a definite volume and mass
mixture
liquid
gas
solid
32
In division and multiplication, the answer must not have more significant figures than the
number in the calculation with the most significant digits
total number of decimal places in the problem
number in the calculation with the fewest significant figures
average number of decimal places in the problem
33
If testing shows an element is a poor conductor of electricity, it is a(n)
metal
non-metal
34
The smallest unit of an element that has the properties of that element is a(n)
conductor
compound
period
atom
35
The element type that is a good conductor of electricity is
factor
non-metal
oxygen
metal
36
Every pure chemical compound consists of two or more elements
combined in an proportion
that can be separated
that cannot be separated
combined chemically
37
Identify as either a chemical or physical change when ice melts
chemical
physical
38
Sharpening a pencil is a physical change
False
True
39
An example of an element is
oxygen
sugar
water
soil
40
How many significant digits does 0.02020 g have?
6
4
3
5
41
If some measurements agree closely but differ widely from the actual value, these measurements are
accurate but not precise
precise but not accurate
both accurate and precise
neither precise nor accurate
42
If two figures are significant, how should the measurement 0.00255 g be reported?
0.025 g
0.026 g
0.0255 g
2.55 g
43
Identify as either a chemical or physical change when burning a piece of paper
chemical
physical
