Unit 4 Quiz Flashcards Preview

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Flashcards in Unit 4 Quiz Deck (26):
1

Anion

A negative ion formed between two no metals when a gain of electrons occurs (that's why it's negative: there's a gain of electrons. It only occurs between nonmetals because they're the only ones that gain electrons, which is why it's negative)

2

Cations

The name stays the same: magnesium stays magnesium

3

Anions

Ide: sulfite becomes sulfide

4

Nitride: cation or anion?

Anion: ends in "ide" and is a nonmetal

5

What does the superscript indicate?

Charge

6

How do you find the charge in an atom?

1,2,3,+-4,-3,-2,-1,0

7

Chemical bonds

An attraction force between atoms/ions that bends them together as a unit

8

Compound

A pure substance that is made up of 2 or more chemically combined elements

9

Molecule

A special term used to describe compounds that are sharing electrons (covalent bond)

10

Binary compound

2 different elements that are sharing electrons (bi, two)

11

Ternary compound

3 or more different elements sharing electrons (ter, tertiary)

12

Ionic bond

A type of bond that occurs with a transfer of atoms: one atom gives its extra electrons to an atom that needs them. Hence, it happens between a metal (who looses electrons), and a metal (who takes electrons). Often referred to as salts (think ion, ionic, iodide)

13

Crystal lattice

What happens in ionic bonds. It's when the positive and negative ions "stack/place" themselves in a way so they can all attract each other and become super strong. This is why a crystal lattice has a very high melting/boiling point: it requires a lot of energy to break down. It's also why it's not a p conductor In It's solid form: it's electrons are not free to move around and pass the charge on

14

Covalent bond

A bond that forms when atoms share electrons, not give/take them. This way, both atoms can satisfy the octet rule in turns. There is no charge, because they are sharing electrons.

15

What type of atoms can create covalent bonds?

Only nonmetals

16

Covalent bond strength

Weak, which is why the boiling/melting points are low. The forces are not attracting, so it's weak and a good conductor of electricity. Not a good conductor In water because it doesn't break apart into ions (eg doesn't pass the charge along)

17

Acids

You know something is an acid when the first element is hydrogen . Water is the exception.

18

Covalent bond classifications:

Polar: is when the atoms don't share the electrons evenly, as one atom has a stronger electronegativity.
Non-polar: when the atoms have more or less equal electronegativity (.4 or below of a difference) and they share electrons evenly

19

Which bond has a charge: ionic or covalent?

Ionic

20

Why do covalent bonds not conduct electricity in water?

They don't break into ions, so electricity can't flow through

21

What are cations?

Ions formed when a a gain of electrons occurs (eg the ion is negative. Hence, can only occur between metals because they need to gain electrons)

22

What are anions?

Ions that form when a loss of electron occurs (eg the ion becomes positive. Hence, it can only occur between metals, as they loose electrons and become positive)

23

Which ion changes its name?

The negative ion, or the anion.

24

Why fo bonds form?

To decrease potential energy and increase stability (eg the less potential energy you have, the more stable you are)

25

What are the two types of bonds that can form?

Ionic and covalent, and two types of covalent: polar and non polar

26

Cation

A positive ion formed between two metals when a loss of electrons occurs