Unit 1 and 2 Test

Science Grade 8 Unit 01 & 02: Science Safety & Atoms 20112012

This test is the property of TESCCC/CSCOPE and as such may not be replicated or changed without permission.

1

Which of these is NOT found in the nucleus of

an atom?

A neutrons

B protons

C the mass of an atom

D electrons

2 When determining an element's identity, what

is the MOST important subatomic part to

examine?

F electrons

G neutrons

H neutrinos

J protons

3 Most of the volume of an atom is occupied by

_________________ .

A protons

B empty space

C a gas

D the nucleus

4 An atom consists of 11 electrons, 12 neutrons,

and a number of protons. Which information

will be MOST helpful in determining the

atom's charge?

F mass number

G conductivity

H physical properties

J chemical reactivity

5 The table shows information about two atoms,

X and Y.

Atom Atomic

Mass

Number

of

Electrons

Charge

X 14 7 0

Y 14 6 0

How can these two atoms have the same

atomic mass?

A Atom X is a liquid and atom Y is a gas.

B Atom Y has one more electron than atom

X.

C Atom Y has one more neutron than atom

X.

D Atom X is a metal and atom Y is a non

metal.

GO ONPage 2This test is the property of TESCCC/CSCOPE and as such may not be replicated or changed without permission.

6

Which of the following elements is identified in the diagram above? _________________

Element Atomic Number

Hydrogen 1

Helium 2

Beryllium 4

Carbon 6


7 Which of these atoms has the LOWEST mass?

A

B

C

D


8 What is its atomic number?

F 1 6

G 1 7

H 18

J 33

9 What is its atomic mass?

A 1 7

B 18

C 33

D 36

10 How many valence electrons does the atom

have?

F 8

G 1 6

H 1 7

J 18

11 What type of atom is this?

A sulfur

B chlorine

C argon

D arsenic

A charged atom has been discovered with 16 protons, 17 neutrons, and 18 electrons.


12 Atomic Number and Atomic Mass of

Elements

Atomic Number Atomic Mass

1 1

1 1 23

2 1 45

3 1 7 0

4 1 93

What is happening to the number of protons

and the number of neutrons in an atom as the

atomic mass of the atom increases?

F The number of protons are increasing

faster than the number of neutrons.

G The number of protons are decreasing

while the number of neutrons are

increasing.

H The number of neutrons are increasing

faster than the number of protons.

J The number of neutrons are decreasing

while the number of protons are

increasing.

13 How many protons would an atom of

magnesium have?

A 1 2

B 24

C 36

D 5 5

14 Which three of the following statements

is CORRECT on how the mass of a single

neutron, proton, and electron relate to each

other?

I. mass of a neutron = mass of a proton

II. mass of a neutron > mass of a proton

III. mass of a neutron < mass of a proton

IV. mass of a neutron = mass of a electron

V. mass of a neutron > mass of a electron

VI. mass of a neutron < mass of a electron

VII. mass of a electron = mass of a proton

VIII. mass of a electron > mass of a proton

IX. mass of a electron < mass of a proton

F I, IV, VII

G I, V, IX

H II, V, VIII

J II, VI, VII


15 Which of the following atomic properties

would be found in section I of the Venn

diagram?

A used to find electrical charge

B used to find atomic number

C found in a cloud around the nucleus

D have a mass of 1 amu

16 Which of the following atomic properties

would be found in section I I of the Venn

diagram?

F used to find electrical charge

G used to find atomic number

H found in a cloud around the nucleus

J have a mass of 1 amu


17 If you break a glass container in the lab, youshould _______________ .

A immediately tell the teacher

B gather the pieces of glass together

C blame your lab partner

D wipe up any chemicals that were in the

test tube

18 If you accidentally splash chemicals in youreye, which piece of safety equipment shouldyou use?

F a fire blanket

G the eyewash station

H the safety shower

J the fire extinguisher

19 You should use goggles when______________ .

A the teacher instructs you to do so

B using chemicals

C using an open flame

D all of the above

20 Neils Bohr was a scientist whose work in the

early 1920's was accepted and used by future

scientists. Which of the following discoveries

is Bohr known for?

F arranging elements into seven groups by

their similar properties

G developing the model of an atom as a

build up of successive orbital shells of

electrons

H being the first to propose the concept of

an atom

J discovering the nucleus of the atom

The following items assess science process skills. They may relate to unit content or to other science

content for the purpose of determining if students can apply process skills to new information or to

combine unit content with previously learned content.

BE SURE YOU HAVE RECORDED ALL OF YOUR ANSWERSON YOUR ANSWER DOCUMENT STOPPage 8


D 51 C081082362RX 8.5(A) None

J 52 C08014743CS 8.5(B) None

B 53 C081082376RX 8.5(A) None

F 54 C081082370RX 8.5(A) None

C 55 C081082372RX 8.5(A) None

Helium 56 C083272162 8.5(B) 8.3(B)

C 57 C083154966 8.5(A) 8.3(B)

F 58 C08014726CS 8.5(A) 8.3(B)

C 59 C08014727CS 8.5(A) 8.3(B)

F 510 C08014744CS 8.5(A) 8.3(B)

A 511 C08014725CS 8.5(B) 8.3(B)

H 512 C08014509CS 8.5(B) 8.5(A)

A 513 C08014723CS 8.5(B) None

G 514 C08014761CS 8.5(A) None

A 515 C08014746CS 8.5(A) 8.2(C)

J 516 C08014747CS 8.5(A) 8.2(C)

A 117 C08014516CS 8.1(A) None

G 418 C08014519CS 8.4(B) None

D 419 C08014520CS 8.4(B) None

G 320 C08014729CS 8.3(D) None

Process SE

Test KeyScience Grade 8 Unit 01 & 02: Science Safety & Atoms 2011-2012

## Correct Answer TEKS SE ObjectiveItem #


mccallump

Rectangle

Science Grade 8 Unit 02 Appendix:

Atoms

2011-2012


Science Assessment and Evaluation Criteria Grade 08 Unit 02 Appendix: Atoms 2011-2012

Performance Indicator #1

Draw two different atoms and label their parts. Describe, in writing, the structure of the atoms, including the masses, electrical charges, and locations of the protons, neutrons, and electrons, the atomic number and mass number of each atom. (8.2C; 8.3B; 8.5A, 8.5B)

8.2C Collect and record data using the International System of Units (SI) and qualitative means such as labeled drawings, writing, and graphic organizers.

8.3B Use models to represent aspects of the natural world such as an atom or a molecule, space, or a geologic feature.

4

The drawing/model is appropriate, clear and appropriately detailed and labeled. This model could be used as an instructional aide.

3

The drawing/model is generally appropriate and clear; however, there may be minor confusion in interpreting the visual. This model could be used in conjunction with an oral explanation.

2

The drawing/model is only minimally appropriate due to a lack of clarity. The graphic is confusing to interpret and needs revision. There may be some areas that are easier to interpret than others and at least some appropriate labels are present. This model would have to be revised in order to use provided information.

1

There is little to no evidence that the student can create a drawing/model of a scientific concept due to disorganization, lack of clarity and inappropriate or missing labels and vocabulary.

0

Student does not attempt the task.


8.5A Describe the structure of atoms, including the masses, electrical charges, and locations, of protons and neutrons in the nucleus and electrons in the electron cloud.

8.5B Identify that protons determine an element’s identity and valence electrons determine its chemical properties including reactivity.

4

The atoms drawn and described include completely accurate information in all of the required areas (mass, electrical charges, location of protons, neutrons and electrons.) Protons show how element's identity is acquired. The drawing is appropriate and the written explanation makes connections between the data given and what they mean.

3

The atoms drawn and described include mostly accurate information so that any errors or omissions are minor. The data in the written explanation may be accurate, but does little to explain what the data means.

2

The atoms drawn and described include several errors or omissions, but do include accurate information with explanations that are appropriate in some cases.

1

The atoms drawn and described have so many errors and omissions that the information cannot be judged to be minimally successful. The writing confuses the data, leaves holes in the data, and inaccurately portrays the data.

0

Student does not attempt the task.


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Unit 1 and 2 Test