particles and elements chem Flashcards

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1
Q

How many elements are there on the periodic table?

A

118

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2
Q

What dows matter mean

A

matter is the scientific word for stuff that makes everything around us.

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3
Q

Why are chemicals like water and carbon dioxide not on the periodic table?

A

they are molecules ( combination of atoms )

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4
Q

What are atoms made of?

A

Protons, neutrons and electrons

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5
Q

Where are protons and neutrons?

A

They are in an atom, they make the nucleus.

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6
Q

Where are electrons?

A

They are in an atom, they orbit the nucleus.

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7
Q

What does an atom have the same of?

A

protons and electrons

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8
Q

What is the smaller number on the periodic table?

A

the atomic number.

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9
Q

What is the larger number on the periodic table

A

The atomic mass

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10
Q

What is the name of the state change between solid and liquid

A

melting

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11
Q

What is the name of the state change between liquid and solid

A

freezing

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12
Q

What is the name of the state change between liquid and gas

A

boiling

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13
Q

What is the name of the state change between gas and liquid

A

condensing

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14
Q

What is the name of the state change between gas and solid

A

deposition

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15
Q

What is the name of the state change between solid and gas

A

sublimation

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16
Q

What happens when you heat up a particles?

A

They vibrate more.

17
Q

What is absolute zero

A

the lowest possible temperature (-273.15)

18
Q

What is the difference between evaporation and boiling

A

evaporation happens layer at a time.

19
Q

What is thermal expantion

A

When you heat a substance, the partials vibrate more, and so the spread out causing the substance to expand.

20
Q

What is particle pressure?

A

When particles hit against a surface, they push on it with a small amount of force, this is known as pressure. A higher temperature will give the particles more energy making them move faster, hit surfaces with a greater force and increasing the pressure.

21
Q

what is the formula for density?

A

mass (g)/ volume (cm squared)

22
Q

What is the formula for mass

A

density X volume

23
Q

what is the formula for volume

A

mass/density

24
Q

what is the atomic number?

A

How many protons are in the nucleus