Spiral Review Module 7.PS1.1 to 7.PS1.3

Spiral Review

7.PS1.1, 7.PS1.2, 7.PS1.3​

UNIT TEST 9/​15(A) AND 9/16 (B)

​Matter

Are you able to break an atom by chemical means?

​Has Mass

Matter is anything that has mass and occupies space.

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Can be broken down to its smallest parts: ATOMS​

ATOM are minute, the smallest part of an element able to retain the properties of that element.​ ATOMS contain 3 subatomic particles

Occupies Space

​Made of atoms of the element, which are the smallest part of any matter.

Atoms have 3 subatomic particles -->​

​​Elements

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The positively charged subatomic particle inside the nucleus

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Has a mass of 1 AMU​

​​Protons

The neutral (no charge) subatomic particle , also found in the nucleus

Has a mass of 1 AMU​

Neutrons

The negatively charged subatomic particle found outside the nucleus, in the electron cloud or on the outer orbits/shells

Electrons

Multiple Choice

What part of an atoms is found in the outer shells or orbits (electron cloud)?

• proton

• electron

• neutron

Multiple Choice

The total number of protons is always the same for all atoms of the same element.

In other words, an atom of mercury has the same number of protons as all the other atoms of mercury.

• TRUE

• FALSE

Multiple Choice

A substance made of only ONE kind of atom is

• matter

• a molecule

• an element

• a mixture

The atomic number is used to identify the element. Element with atomic number 2 is always Helium.

The ATOMIC NUMBER is the same as the number of protons of that atom or element​

Atomic Number

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The atomic mass is the sum of the number of protons and the number of neutrons (both found in the nucleus), Each has a mass of 1 AMU​

​​Atomic Mass

Multiple Choice

Joey wants to identify an element. He has the following information: The element has 10 protons, 10 neutrons, and 10 electrons. Which of the three pieces of information helps identify the element?

• the number of protons

• the number of neutrons

• the number of electrons

Multiple Choice

How do we know that Joey's element is Neon?

• because Neon has 10 electrons

• because Neon's atomic number is 10, which is equal to the number of protons

• because Neon has an atomic mass of 20

Multiple Choice

Joey also has an element with an atomic mass of 35 units. He knows his element is Chlorine. He needs to find out how many neutrons Chlorine has. Which is the correct method to determine the number of neutrons in an atom, knowing that 99% of the atomic mass is centered in the nucleus.

• atomic mass = protons - electrons

• neutrons = electrons + protons

• Neutrons = atomic mass - protons

Multiple Choice

What is true about the atom?

• the atomic mass is equal to the sum of the atomic number and the number of electrons

• protons and electrons are neutral

• protons and electrons have opposite charges and are apart with an empty space in between

Atoms of an element cannot be broken down any further by chemical means.

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Atoms and elements are PURE substances. Contain only one kind of atom, or one kind of molecule

The periodic table organizes the elements by atomic number

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​O (oxygen atom), O₂ (oxygen molecule), H₂O (water molecule), CO₂ (carbon dioxide molecule), NaCl (sodium chloride).

Multiple Choice

Which is true about NO₂?

• It is an element

• It is a compound made of two molecu

• It is a compound made of 1 Nitrogen atom and 2 Oxygen atoms

Multiple Choice

Which is true about mixtures and pure substances?

• A mixture is made of only one type of atom, and a pure substance is chemically bonded

• A mixture has different properties throughout. A pure substance has the same properties throughout

• A pure substance is made of different types of molecules physically combin

Multiple Choice

The chemical reaction of two or more elements in a fixed ration is a (n)

• mixture

• atoms

• compound

• shell

​Elements are represented by chemical symbols. Each symbol has one capital letter, or one capital letter followed by a lower case letter.

Each element has a unique name, symbol, and atomic number. Elements have unique properties - that makes them different from each other.​

Chemical symbol

​

H - Hydrogen

O - Oxygen

2H + O = H₂O = water​

Examples of chemical formulas using chemical symbols

Are the properties of water the same as the properties of Oxygen and Hydrogen?

Single atom of carbon.

Symbol C. ​

Carbon atom- pure substance

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Oxygen atom - pure substance

Atoms combine to make new substance. Oxygen and Carbon make Carbon Monoxide.

​C + O = CO

CO is the chemical formula for carbon dioxide​

​Carbon Dioxide - a compound

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Single atom of oxygen.

Symbol O​

A compound molecule is made of two or more DIFFERENT types of atoms via chemical reaction!

​

Multiple Choice

Atoms combine to make

• molecules

• electrons

• mixtures

Multiple Choice

Pure substance have different chemical properties. When combined by chemical reactions, the properties of the new substance

• are different from the properties of the original substances

• are the same as the original substances

• are the same as long as heat is added

Multiple Choice

compounds are made of

• only of one type of chemical element

• several molecules together

• two or more different types of chemical elements

Multiple Choice

All of the following are chemical formulas for compound molecules EXCEPT (which one is not)

• C₆H₁₂O₆

• H₂O

• NaCl

• Ne

Multiple Choice

What is true about pure substances?

• has the same chemical properties throughout

• are unable to be separated by chemical means

• can only be separated by physical means

Elements - are pure substance - one kind of atom

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​​molecules - are pure substance - one kinde of molecule - chemically bonded

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Both have same chemical properties​

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​​Homogenous -Two or more pure substances physically combined. Evenly mixed - parts not visible

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Heterogenous - all parts are visible. Able to physically separate

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PURE SUBSTANCES

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MIXTURES

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A pure substance has only one kind of atom or compound

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​A mixture can be solid, gas, or a combination of different states of matter physically combined.

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Each compound retains its own chemical properties.

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A new substance is NOT formed​

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Mixtures

Heterogenous

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Homogenous

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Chocolate milk, orange juice

koolaid, salty water

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Silver, oxygen, helium salt , water, glucose

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water and sand,

trail mix,

Cereal and milk​

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A pure substances

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Ag, O₂, He

H₂O, NaCl, C₆H₁₂O₆​

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Multiple Choice

Which diagram represents a compound?

Multiple Choice

Which is true about the helium and the lithium atom represented here?

• Helium has more electrons

• Helium is a larger atom

• Lithium has more protons, neutrons, and electrons

• Lithium has a smaller mass

Multiple Choice

Which diagram represents a homogenous mixture?