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10 Questions: Chemistry Multiple Choice Quiz | Sci / Tech

A chemistry mix. Here goes...

A multiple-choice quiz by clarod. Estimated time: 3 mins.

Author
clarod

Time
3 mins

Type
Multiple Choice

Quiz #
299,436

Updated
Dec 03 21

# Qns
10

Difficulty
Average

Avg Score
6 / 10

Plays
4333

Last 3 plays: rainbowriver (7/10), workisboring (8/10), Barbarini (9/10).

One at a Time - Single Page - Timed Game

Question 1 of 10

1. What do you use to work out the formula of an ion? Hint

Put numbers of atoms together to see what looks good.

Balance the charges on each of the components in the compound.

Guess.

Get the formula from the internet.

NEXT>

Question 2 of 10

2. Isotopes of the same element have different numbers of what? Hint

Protons.

Neutrons.

Quarks.

Electrons.

NEXT>

Question 3 of 10

3. What is the apparatus used to separate crude oil into more useful substances called? Hint

Condenser

Fractionating column

Burette

Mass balance

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Question 4 of 10

4. What is the general formula for an alkene? Hint

CnH2N+2

C2H3

CnH2n

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Question 5 of 10

5. Why is ice less dense than water? Hint

Because of the hydrogen bonds.

Its not, its actually more dense than water.

It has more atoms.

Because water is a liquid.

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Question 6 of 10

6. Is sodium a group 1 metal?

Yes

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Question 7 of 10

7. Electronegativity is defined as? Hint

A bond between two carbon atoms.

The amount of energy needed to remove one mole of electrons from one mole of gaesous atoms, to form one mole of 1+ ions.

Breaking bonds by adding water.

The measure of attraction between electrons to atoms in a covalent bond.

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Question 8 of 10

8. If you had 23 grams of sodium, how many moles would you have? Hint

0.25

0.5

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Question 9 of 10

9. Who is credited with coining the idea of "Triads?" Hint

Dalton

Mendeleev

Newlands

Dobereiner

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Question 10 of 10

10. What is the oxidation number of one chromium atom in potassium dichromate, K2Cr2O7? Hint

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Quiz Answer Key and Fun Facts

1. What do you use to work out the formula of an ion?

Answer: Balance the charges on each of the components in the compound.

Balancing the charges or counting the number of electrons in the outer shells of the atoms are two ways to find out a formula of an ion.
eg.

Ba2+ and F1- =BaF2

You should never guess or get the information from the internet, because it is likely to be wrong.

2. Isotopes of the same element have different numbers of what?

Answer: Neutrons.

An atom is made up of protons, neutrons and electrons. Isotopes of the same element are comprised of the same number of protons and electrons, but differing numbers of neutrons, which constitute the differences in atomic masses of isotopes.
For example, carbon-12 has 6 protons, 6 electrons, and 6 neutrons. Carbon-14 has 6 protons, 6 electrons, and 8 neutrons.

3. What is the apparatus used to separate crude oil into more useful substances called?

Answer: Fractionating column

Crude oil has several fractions, all of which have different boiling points, and so are extracted separately, and at different temperatures.
The products include naptha, kerosene, bitumen, and aircraft fuel.

4. What is the general formula for an alkene?

Answer: CnH2n

An alkene is a hydrocarbon, with one carbon-carbon double bond. It is unsaturated, as the double bond can be broken to form other bonds. Alkenes have the general formula CnH2n, examples include ethene, which has the formula C2H4.

5. Why is ice less dense than water?

Answer: Because of the hydrogen bonds.

Ice is less dense than water because when the water freezes, the hydrogen bonds stretch creating spaces between water molecules, which decrease the density. This is why ice floats on water.

6. Is sodium a group 1 metal?

Answer: Yes

Sodium, with the chemical symbol Na, is in group 1 of the periodic table, and it has an atomic mass of 23. It is part of the alkaline metals, group 1, because it forms an alkaline solution when it is added to water.

7. Electronegativity is defined as?

Answer: The measure of attraction between electrons to atoms in a covalent bond.

Electronegativity across the Periodic Table increase from the bottom of group 1, peaking at the top of group 7. Linus Pauling discovered electronegativity.

8. If you had 23 grams of sodium, how many moles would you have?

Answer: 1

Number of moles = amount you have / amount in a mole.

9. Who is credited with coining the idea of "Triads?"

Answer: Dobereiner

Dobereiner is credited with the idea of "triads."
In 1829, Dobereiner said that the element in the middle of two others had the average atomic mass of the other elements around it.

10. What is the oxidation number of one chromium atom in potassium dichromate, K2Cr2O7?

Answer: 6+

Potassium dichromate is used, along with sulphuric acid, to oxidise alcohols.
It has the oxidation number 6+ because:

k-1+ 7o- 14-
k-1+

So therefore, the two chromium atoms have the charge 12- (-14 -2), which is then halved, to get the 6- charge on one chromium atom.

Source: Author clarod

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