A molecule of ethanol has two carbon atoms, six hydrogen atoms, and one oxygen atom. A ball-and-stick model of a molecule of ethanol is made from the following components:
one red ball
two black balls
six white balls
eight sticks
What do the black balls in the model represent?
(1 point)
Responses
oxygen atoms
oxygen atoms
hydrogen atoms
hydrogen atoms
carbon atoms
carbon atoms
bonds between atoms
The black balls in the model represent carbon atoms.
Use the model of a molecule to answer the question.
H H
| |
H — C — C — O — H
| |
H H
How many atoms of carbon does this molecule have?
(1 point)
Responses
1 atom
1 atom
2 atoms
2 atoms
6 atoms
6 atoms
4 atoms
This molecule has 2 atoms of carbon.
Which term describes the repeated arrangement of the same molecule?(1 point)
Responses
atoms
atoms
bonds
bonds
molecular model
molecular model
extended structure
The term that describes the repeated arrangement of the same molecule is "extended structure".
Use the table to answer the question.
Atom Color in
Molecular Model
hydrogen (H) white
oxygen (O) red
nitrogen (N) blue
carbon (C) gray
Which option correctly describes a model of methanol, CH3OH?
(1 point)
Responses
A. one gray sphere, three white spheres, one red sphere, one blue sphere
one gray sphere, three white spheres, one red sphere, one blue sphere
B. one gray sphere, four white spheres, one red sphere
one gray sphere, four white spheres, one red sphere
c. two red spheres, four white spheres
two red spheres, four white spheres
D. one blue sphere, four white spheres, one red sphere
The correct option that describes a model of methanol, CH3OH, is B. one gray sphere, four white spheres, one red sphere.
Which of the following describes what it means when subjects and verbs agree?(1 point)
Responses
They describe the same things.
They describe the same things.
They are both singular or both plural.
They are both singular or both plural.
They are not separated by interrupting words.
They are not separated by interrupting words.
They have the same ending.
The correct response is: They are both singular or both plural.
Which sentence uses correct subject-verb agreement?(1 point)
Responses
My brother always want to cook dinner.
My brother always want to cook dinner.
The cat carefully steps across the fence.
The cat carefully steps across the fence.
My teachers often gives homework on the weekend.
My teachers often gives homework on the weekend.
The clouds swiftly moves across the sky.