Basic Science Test 22

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Basic Science Test 22

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Weekly Quiz Competition

Question 1
1 / -0

A boat goes across a river with a velocity 12 km/h . The magnitude of its resultant speed in flowing water is 13 km/h . The velocity of water flow in the river is :

A
5 k m/h

B
7 km/h

C
9 km/h

D
1 km /h

Solution

Answer
$$ V_{sel} = \sqrt{v_{\omega}^{2} + B_{b}^{2}} $$

$$ V_{sel}^{2} = V\omega + V_{b}^{2} $$

$$ V \omega^{2} = v^{2}_{sel} - V_{b}^{2} $$

$$ = \sqrt{13^{2} - 12^{2}} $$

$$= \sqrt{169 - 144} $$
$$ =\sqrt{25} $$
=5km/h
Question 2
1 / -0

Which one of the elements with following outer electronic configurations may exhibit the largest number of oxidation states?

A
$$3d^5 4s^1$$

B
$$3d^5 4s^2$$

C
$$3d^2 4s^2$$

D
$$3d^3 4s^2$$

Solution

For transition metal elements, a general rule is $$\Rightarrow The\ max\ number\ of\ oxidation\ states = no. \ unpaired\ d-orbital\ electrons\ + \ the\ 2s\ electrons.$$
Explanation:
As noted, the maximum number of oxidation states a given transition metal is (generally) the number of unpaired $$d$$-orbitals plus the $$2\ s$$-orbital electrons. This then finds the transition elements with the higher numbers of oxidation states in the middle of the transition series.
For the question presented and written in order of Aufbau Diagram:
$$4s^1 3d^5 \Rightarrow 4s\uparrow 3d\uparrow \uparrow \uparrow \uparrow \uparrow 4s\uparrow 3d\uparrow \uparrow \uparrow \uparrow \uparrow \Rightarrow 6\ oxidation\ states$$
$$4s^2 3d^5 4s^2 3d^5 \Rightarrow 4s\uparrow \downarrow 3d\uparrow \uparrow \uparrow \uparrow \uparrow 4s\uparrow \downarrow 3d\uparrow \uparrow \uparrow \uparrow \uparrow \Rightarrow 7\ oxidation\ states$$
$$4s^2 3d^2 \Rightarrow 4s\uparrow \downarrow 3d\uparrow \uparrow 4s\uparrow \downarrow 3d\uparrow \uparrow \Rightarrow 4\ oxidation\ states$$
$$4s^2 3d^3 \Rightarrow 4s\uparrow \downarrow 3d\uparrow \uparrow \uparrow 4s\uparrow \downarrow 3d\uparrow \uparrow \uparrow \Rightarrow 5\ oxidation\ states$$
Example:
Iron has $$4$$ unpaired electrons and $$2$$ paired electrons. To find one of its oxidation states, we can use the formula:
Oxidation State of $$Fe = 4 + 2 = +6$$
Indeed, $$+6$$ is one of the oxidation states of iron, but it is very rare. Other possible oxidation states for iron includes: $$+5,\ +4,\ +3,$$ and $$+2.$$
Here are some oxidation states of elements in the $$1st$$ Transition Series
Question 3
1 / -0

An area that is in a properly deployed state is known as?

A
Mainline

B
Baseline

C
Endline

D
Startline
Question 4
1 / -0

In the lecture, the first supporting detail, which defines Science, is

A
Observation, inferencing, predicting, classifying and making models

B
Science is using different skills to make models

C
One or more senses to gather info

D
None of these

Solution

Science is using different skills to make models.
Question 5
1 / -0

Which term describes centrioles beginning to move apart in animal cells?

A
telophase

B
anaphase

C
prometaphase

D
metaphase

E
prophase
Question 6
1 / -0

How do the daughter cells at the end of mitosis and cytokinesis compare with their parent cell when it was in G1 of the cell cycle?

A
The daughter cells have half the amount of cytoplasm and half the amount of DNA.

B
The daughter cells have half the number of chromosomes and half the amount of DNA.

C
The daughter cells have the same number of chromosomes and half the amount of DNA.

D
The daughter cells have the same number of chromosomes and the same amount of DNA
Question 7
1 / -0

Which term describes two centrosomes arranged at opposite poles of the cell?

A
telophase

B
anaphase

C
prometaphase

D
metaphase
Question 8
1 / -0

What part of the atom is involved in chemical reactions?

A
protons

B
neutrons

C
nucleus

D
electrons
Question 9
1 / -0

Consider the diagram of a eukaryote and a prokaryote. According to cell theory,

A
both are single cells that carry out the functions of life.

B
both are examples of primitive cells that are not capable of reproduction.

C
both are examples of cells with a nucleus to direct the functions of life.

D
only the eukaryote has true cell structure to carry out the functions of life.
Question 10
1 / -0

The acceleration due to gravity is ____.

A
$$ 98 m/s^2 $$

B
$$ 9.8 m/s^2 $$

C
$$ 9.8 m/s $$

D
$$ 0.98 m/s $$

Solution

$$ 9.8 m/s^2 $$

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Re-Attempt Weekly Quiz Competition

Basic Science Test 22

Result

Basic Science Test 22

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Rank

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SHARING IS CARING

Question 1

5 k m/h

7 km/h

9 km/h

1 km /h

Solution

Question 2

$$3d^5 4s^1$$

$$3d^5 4s^2$$

$$3d^2 4s^2$$

$$3d^3 4s^2$$

Solution

Question 3

Mainline

Baseline

Endline

Startline

Question 4

Observation, inferencing, predicting, classifying and making models

Science is using different skills to make models

One or more senses to gather info

None of these

Solution

Question 5

telophase

anaphase

prometaphase

metaphase

prophase

Question 6

The daughter cells have half the amount of cytoplasm and half the amount of DNA.

The daughter cells have half the number of chromosomes and half the amount of DNA.

The daughter cells have the same number of chromosomes and half the amount of DNA.

The daughter cells have the same number of chromosomes and the same amount of DNA

Question 7

telophase

anaphase

prometaphase

metaphase

Question 8

protons

neutrons

nucleus

electrons

Question 9

both are single cells that carry out the functions of life.

both are examples of primitive cells that are not capable of reproduction.

both are examples of cells with a nucleus to direct the functions of life.

only the eukaryote has true cell structure to carry out the functions of life.

Question 10

$$ 98 m/s^2 $$

$$ 9.8 m/s^2 $$

$$ 9.8 m/s $$

$$ 0.98 m/s $$

Solution

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