問題一覧
1
Difference between Filtration and Distillation?
Filtration- Separates solid from liquid Distillation- Seperates water from different materials
2
whats the rule of chem symbols
First letter is capitalized and the 2nd isn’t
3
Define Physical Change (some properties _ but the_
Some properties of a material change but the composition does not
4
Define a Chemical Reaction( when the what of what changes)
when the comp of matter changes
5
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
6
words for a chem change?
reactants and products
7
Difference between products and reactants?
Products- substances at the start reactants- results of the chemical change
8
5 examples of compounds W, C, S, B, SO… all white stuff
Water, Carbon, Table Salt, Baking Powder, Soap
9
Difference between Homo and Hetero mixture? (Uniform)
Homo- Composition is uniform throughout Hetero- Composition is NOT uniform throughout
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
What are the two types of physical changes and give two examples of them
Irreversible- Break and Split Reversible- Melting and Freezing
12
law of conservation of matter?
in any physical or chemical change, mass is conserved
13
Whats a precipatate? how is it formed? Liquid + Liquid
a solid formed from different liquids combine
14
Why is the formula for a (the) COMPOUND always the same?
The compound has a fixed position
15
Difference between mixture and substance? (fixed/varies)
Mixture- comp of material is fixed Substance- comp of material varies
16
DEfine extensive property and give an example of it
Depends on the amount of matter in a sample like volume
17
What info do subscripts in a chem formula give? the _ of _
the relative proportions of the elements
18
Why are mixtures easy to separate into what they are made of?
Differences in Physical Properties
19
Difference between compounds and elements? (can be easily…)
Elements cant be broken down and Compounds can easily be seperated
20
How do chem symbols benefit chem
They provide a way to write chemical formulas
21
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,
22
Define intensive property and give an example
Depends on type of matter in a sample like hardness