問題一覧
1
DEfine extensive property and give an example of it
Depends on the amount of matter in a sample like volume
2
Define intensive property and give an example
Depends on type of matter in a sample like hardness
3
List 4 Characteristics to help define the 3 states of matter
Solid- definite shape and volume, particles packed, fixed positions, least amount of energy Liquid- definite volume but not shape, particles in flow, more energy than solids gas- no definite shape or volume, particles expand, highest amount of energy,
4
What are the two types of physical changes and give two examples of them
Irreversible- Break and Split Reversible- Melting and Freezing
5
Define Physical Change (some properties _ but the_
Some properties of a material change but the composition does not
6
Difference between Homo and Hetero mixture? (Uniform)
Homo- Composition is uniform throughout Hetero- Composition is NOT uniform throughout
7
4 examples of homo and hetero mixtures HOMO-A, SW, V, C. and. Hetero- S, O, C, P
Homo- Air, Salt Water, Vinegar, Coffee Hetero- Sand, Oil, Chicken Noodle Soup, Pizza
8
Why are mixtures easy to separate into what they are made of?
Differences in Physical Properties
9
Difference between Filtration and Distillation?
Filtration- Separates solid from liquid Distillation- Seperates water from different materials
10
Define Element and give 5 examples (matter)
Simpliest form of matter with a unique set of properties examples- carbon, hydrogen, oxygen, sodium, iron
11
Difference between compounds and elements? (can be easily…)
Elements cant be broken down and Compounds can easily be seperated
12
5 examples of compounds W, C, S, B, SO… all white stuff
Water, Carbon, Table Salt, Baking Powder, Soap
13
Difference between mixture and substance? (fixed/varies)
Mixture- comp of material is fixed Substance- comp of material varies
14
How do chem symbols benefit chem
They provide a way to write chemical formulas
15
whats the rule of chem symbols
First letter is capitalized and the 2nd isn’t
16
What info do subscripts in a chem formula give? the _ of _
the relative proportions of the elements
17
Why is the formula for a (the) COMPOUND always the same?
The compound has a fixed position
18
Define a Chemical Reaction( when the what of what changes)
when the comp of matter changes
19
words for a chem change?
reactants and products
20
Difference between products and reactants?
Products- substances at the start reactants- results of the chemical change
21
law of conservation of matter?
in any physical or chemical change, mass is conserved
22
Whats a precipatate? how is it formed? Liquid + Liquid
a solid formed from different liquids combine