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Question 1

What is an element?

Answer 1

An element is a pure substance consisting only of the same kind of atoms.

Elements are the simplest forms of matter and cannot be broken down into simpler substances.

Question 2

What is a mixture?

Answer 2

A mixture is a material made up of two or more different elements which are not chemically combined.

Mixtures can be separated by physical means.

Question 3

How many different elements are in the periodic table?

Answer 3

There are 118 different elements in the periodic table.

Of these, 92 exist naturally, while the others were made by scientists.

Question 4

What suffix is used for naming compounds with two elements?

Answer 4

-ide suffix.

This suffix indicates the presence of a compound formed from two different elements.

Question 5

What suffix is used for naming compounds with three elements, including oxygen?

Answer 5

-ate suffix.

This suffix is used when one of the elements in the compound is oxygen.

Question 6

List three elements that begin with the letter C.

Answer 6

• Carbon (C)
• Chlorine (Cl)
• Calcium (Ca)

These elements can be found on the periodic table.

Question 7

What are the chemical symbols for gold, silver, and platinum?

Answer 7

• Gold (Au)
• Silver (Ag)
• Platinum (Pt)

These are the chemical symbols for these precious metals.

Question 8

What does the periodic table show?

Answer 8

The periodic table shows the different elements.

It is a systematic arrangement of all known chemical elements.

Question 9

Fill in the blank: The periodic table shows the different __________.

Answer 9

elements

Question 10

What is the chemical symbol for potassium?

Answer 10

K

Potassium is an alkali metal and is highly reactive.

Question 11

What is the chemical symbol for nitrogen?

Answer 11

N

Nitrogen makes up about 78% of the Earth’s atmosphere.

Question 12

What is the chemical symbol for fluorine?

Answer 12

F

Fluorine is the most reactive and electronegative of all elements.

Question 13

What is the chemical symbol for neon?

Answer 13

Ne

Neon is a noble gas and is colorless and odorless.

Question 14

What is the chemical symbol for magnesium?

Answer 14

Mg

Magnesium is an essential element for all living cells.

Question 15

What is the chemical symbol for manganese?

Answer 15

Mn

Manganese is used in steel production.

Question 16

What is the chemical symbol for phosphorus?

Answer 16

P

Phosphorus is crucial for life and is a key component of DNA.

Question 17

What is the chemical symbol for arsenic?

Answer 17

As

Arsenic is known for its toxicity and is used in some alloys.

Question 18

List the chemical symbols for the following elements: Carbon, Hydrogen, Helium, Iron, Oxygen, Magnesium, Aluminium, Copper, Cobalt.

Answer 18

• Carbon (C)
• Hydrogen (H)
• Helium (He)
• Iron (Fe)
• Oxygen (O)
• Magnesium (Mg)
• Aluminium (Al)
• Copper (Cu)
• Cobalt (Co)

These symbols are used universally in chemical equations.

Question 19

State which of the following substances are elements and which are compounds: Lithium (Li), Lithium chloride (LiCl), Chlorine (Cl2).

Answer 19

• Elements: Lithium (Li), Chlorine (Cl2)
• Compound: Lithium chloride (LiCl)

Elements consist of only one type of atom, while compounds are made from two or more different types of atoms.

Question 20

What is the first word in the name of a compound with three or more elements that includes oxygen?

Answer 20

The name of the metal element.

This is followed by the modified name of the non-metal elements.

Question 21

When naming compounds, what do you replace oxygen with?

Answer 21

The suffix -ate.

This indicates the presence of oxygen in the compound’s structure.