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HChem Ch 1 and 4, lab skills and CERR test review Flashcards | StudBud
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HChem Ch 1 and 4, lab skills and CERR test review
HChem Ch 1 and 4, lab skills and CERR test review
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sci method, CERR, ch 4 info
Flashcards
35 cards
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Answers
1
It is important to read directions...
only in lab.
sometimes.
only if I have a question.
all the time.
2
From the image below, what is the independent variable?
months of the year
no obvious trend
total sales
1 year
3
The charge on Bromine is a -1 because
Br is a cation.
Br needs to lose an e- to reach Octet.
Br needs to gain an e- to reach Octet.
Because Br has 7 e- in the outer shell so it is not stable.
4
How does the temp of water affects the number breaths a goldfish takes in 1 min? The control would be...
the water temp
making sure use use the same goldfish
the room temp water
the number of breaths the fish takes
5
All A group elements on the periodic table (green ones in pic) are organized according to all of the following EXCEPT...
atomic mass
properties
number of e- in outer shell
atomic number
6
According to what we know today about the atom, this type of picture of a Bohr model is the most accurate representation
True
False
7
_____must have mass and take up space.
Science
Chemistry
Matter
The scientific method
8
Which of the following is FALSE regarding neutrons.
The number of neutrons generally equals the number of protons.
Neutrons have no charge.
Neutrons are found in the nucleus.
If the numbers of neutrons change the mass changes and an isotope forms.
9
Choose the FALSE statement about Beryllium according to the info you see below.
Be has 4 protons
The most common isotope of Be has 5 neutrons
Be has a mass number of 9.01
Be has an atomic number of 4.
10
The center or core of an atom is called the....
nucleus
center, there is no special name
atomic mass
protons
11
If you do an experiment, the variable that is purposely manipulated between trials is the...
standardized variable
control
dependent variable
independent variable
12
Which of the following is FALSE regarding electrons?
Atoms can gain or lose electrons without changing their identity.
Electrons are negative.
Electrons are found in the nucleus.
Electrons are in constant motion.
13
Which of the following is FALSE regarding protons?
Protons are positive.
The number of protons is called the atomic mass.
Protons are located in the nucleus.
The number of protons distinguishes one element from another.
14
How many neutrons are in K-40?
39
21
20
19
15
Safety is the responsibility of...
the teacher.
everyone in class.
me.
everyone but me.
16
In the event of a school fire or drill during chemistry class, you should...
stay put until you are told where to go.
go to the left side of the field.
go to the right side of the field.
evacuate to Sears.
17
The most common charge for Be would be...
+2
-2
2A
0
18
If HOMEWORK is due Mon and you submit on Wed, how much is it worth (at a maximum)?
50%
0%
75%
80%
19
Choose the TRUE statement with regard to theories.
Theories are false, laws are true.
Theories have mathematical representations (formulas), laws do not.
Theories can be modified, laws are not.
Theories will eventually turn into laws.
20
If a lab CERR write up is due on MON and you submit it on WED, how much is it worth (maximum)?
50%
75%
0
80%
21
A "good" hypothesis must be_____.
true.
phrased as a question.
stated in the positive.
testable.
22
Given the following annotation about Mg, which of the following is FALSE?
Mg has 12 electrons
Mg is charged; it's a cation
Mg has 12 neutrons
Mg has 12 protons
23
The most common isotope value for Be would be
+2
9.01
4
9
24
The trend of the line being positive until day 6 shows the dep variable increased over time up to a point. This is...
Reasoning
Relevance
Evidence
Claim
25
Given an isotope of Argon-42, which is TRUE?
Argon-40 is the least abundant.
Argon-42 is the most abundant.
Argon-40 is the most abundant.
Argon-42 is an ion.
26
Which is matter?
energy
sound
my breath
heat
27
When using CERR in writing, it should strictly be used for scientific writing only.
False
True
28
The lab equipment pictured here is...
fire starter
a chemical burner
a bunsen burner
a flame holder
29
What part of your body is the most vulnerable to damage and should be most protected?
legs/feet
hands/arms
eyes/head
body
30
An experiment is testing how the temp of water affects the number breaths a goldfish takes in 1 min. Pick which is true.
Water temp is the dependent variable.
Number of breaths is a standardized variable.
The color of all the goldfish should be the same.
Room temp water is the control.
31
In which part of CERR is the hypothesis restated and told if it has been accepted/rejected?
Evidence
Relevance
Claim
Reason
32
______ is the study of matter and the changes it undergoes.
CERR
Science
Chemistry
The Scientific Method
33
The model that best describes the current structure of the atom is called...
the electron cloud model
any of the above are acceptable
the Bohr model
the quantum mechanical model
34
Which of the following is a piece of quantitative data about the apple?
The apple looks juicy.
The apple is solid matter.
The apple has a mass of more than 200 grams.
The apple looks shiny.
35
In the event of a chemical spill, the first thing you should do is...
hide it so you don't get in trouble.
clean it up properly.
notify the teacher.
ignore it and pretend you didn't spill.
