Elements, Mixtures and Compounds End of year test Flashcards by Rushi Patel

Q

What is an atom?

A

Smallest unit of matter

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Q

How many naturally occurring elements?

A

92

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Q

Define an element.

A

Substance of one atom type

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Q

Name three elements.

A

Gold, carbon, hydrogen

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Q

Chemical symbol for sodium?

A

Na

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Q

Symbol Cl is which element?

A

Chlorine

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Q

Why are chemical symbols universal?

A

Same in all languages

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Q

Where do you find element names and symbols?

A

Periodic Table

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Q

Symbol O is which element?

A

Oxygen

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Q

Symbol Mg is which element?

A

Magnesium

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Q

What is a molecule?

A

Atoms chemically bonded

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Q

Example: molecule of same atom type

A

O₂ (oxygen gas)

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Q

Atoms in water molecule?

A

2 hydrogen, 1 oxygen

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Q

how many Hydrogen atoms in H₂O?

A

Two

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Q

Formula for sulfur dioxide?

A

SO₂

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Q

Why molecule atoms have different masses?

A

Different elements’ masses

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Q

Molecule with two atom types?

A

CO₂ or SO₂

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Q

Smallest unit with substance’s properties?

A

Molecule

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Q

Oxygen atoms in CO₂?

A

Two

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Q

Define a compound.

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A

Two+ elements chemically joined

Q

Iron and bromine compound name?

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A

Iron bromide

Q

Suffix for chlorine in compounds?

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A

-chloride

Q

Magnesium and fluorine compound?

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A

Magnesium fluoride

Q

Compound: one oxygen, one carbon?

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A

Carbon monoxide (CO)

Compound vs element?

Compound can be broken down

Name of CuO?

Copper oxide

Why compounds differ from elements?

New properties from bonding

Formula for sodium chloride?

NaCl

Compound: sulfur and oxygen?

SO₂ (sulfur dioxide)

Subscript in formula means?

Number of atoms

Chlorine atoms in MgCl₂?

Two

Formula for carbon monoxide?

CO

Formula: 1 sodium, 1 oxygen, 1 hydrogen?

NaOH

Atoms in H₂O?

Three

"2" in CO₂ means?

Two oxygen atoms

Formula for sulfur dioxide?

SO₂

Atoms in NaOH?

Three

Formula H₂ means?

Hydrogen gas molecule

What is the Periodic Table?

Chart of all elements

How are elements grouped?

By properties

Same group as magnesium?

Calcium or Group 2 elements

Where are non-metals on table?

Right side

Symbol for nitrogen?

N

Two elements with chlorine in group?

Fluorine, bromine

Symbol for potassium?

K

Symbol S is which element?

Sulfur

Element in same period as sodium?

Magnesium or aluminum

What info does table give about elements?

Name, symbol, atomic number