Compounds, Mixtures, Substances Flashcards Preview

Physical Science 2k17 Lit flashcards > Compounds, Mixtures, Substances > Flashcards

Flashcards in Compounds, Mixtures, Substances Deck (21)
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1
Q

What is a compound?

A

A compound is formed anytime atoms of two or more different elements are chemically bonded together

2
Q

What is a chemical reaction?

A

The making, breaking, or rearranging of the chemical bonds between atoms

3
Q

What are the atoms in compounds held together by?

A

Electrical attractions between the protons and electrons

4
Q

What is the force that mainly governs the way things behave in everyday life

A

The electromagnetic force

5
Q

What kind of substances are compounds

A

pure substances

6
Q

What is the chemical symbol for salt

A

NaCl

7
Q

Who was the first to propose that atoms always combine together in whole number ratios to form compounds.

A

John Dalton 1803

8
Q

What is the chemical formula

A

A chemical formula shows the ratio of atoms in the compound

9
Q

What are several examples ratios in compounds

A

NH3 1:3 hydrogen= Amonia
SO2 1:2 Sulfur Oxygen= Sulfur Oxide
C3H8 3:8 Carbon Hydrogen=Propane
CH4 1:4 carbon hydrogen=Methane
Mg(NO3)2 1:2:6 magnesium nitrogen oxygen=magnisium nitrate
CaCO3 1:1:3 calcium carbon oxygen= Calcium carbonate

10
Q

Are Mixtures pure substances

A

no

11
Q

How are mixtures formed

A

When substances combine but no chemical reaction occurs between the substances

12
Q

What are the two types of mixtures

A

Heterogeneous and homogeneous

13
Q

What is the difference between Heterogeneous and Homogeneous mixtures

A
Hetro= You can see the different components within the mixture fairly easily
Homo= The two substances appear to be uniform but plot twist they arent
14
Q

WHat is another name for homo mixtures

A

Solutions

15
Q

How is a solution formed

A

When one substance called a solute is desolved into another substance called a solvent

16
Q

The process of dissolving does not include what

A

A chemical reaction

17
Q

What is a charged atom called

A

an Ion

18
Q

What does dissociate mean and what does it usually apply to

A

To come apart and it is mostly assosiated with crystals

19
Q

What does a polar molecule mean

A

This means that there are one or more places in the molocule that are more positively charged and one or more places where it is negatively charged

20
Q

What do most electronic devices rely on to work

A

Crystalline semiconductors

21
Q

What is the term scientists use for adding another completely different element into the crystal semi conductor every 1/10000 times

A

Doping