Properties
Of gases, liquids and solids, what is the denser state of matter?
solid
All of these are evidence that a chemical change has occurred except
Precipitate reversibility
Gas energy
reversibility
How many of the following are elements?
Table salt
Copper
Sodium bicarbonate
Mercury
Carbon dioxide
2
What is an alloy?
An alloy is a mixture of two or more elements where at least one of the elements is a metal.
Ex. Stainless Steel, brass, bronze
What is the density of 37.72g of matter whose volume is 0.80 cm3?
47 g/cm3
What are the two classifications of matter?
Substance and Mixture
Give 2 examples of a chemical change
baking a cake, cooking an egg, rust on a bike
Which of the following is an example of a heterogeneous mixture?
Sand in water salt dissolved in water
Homogenized milk air
Sand in water
What is a vapor?
Vapor is a substance that is currently a gas but is nomrally a solid or liquid
The first figure in a properly written chemical symbol always is ________________
Capitalized
List 3 examples of a physical property
color, texture, mass, volume, hardness, shape, m/b point, weight, ect
A student sticks a magnesium strip in a Bunsen burner in lab and classifies this change as a chemical change. What piece of evidence did she observe that characterized this change as a chemical change?
See video
intense white light produced
A chemical composition of two or more different elements joined together in fixed proportions is known as a(n)______
Compound
What is the name given to the process of separating 2 liquids based on differences in boiling point?
Distillaiton
Write the following in scientific notation:
0.00053
5.3 x 10-4
What is an intensive property?
Intensive properties depend on the type of matter, not the amount
Ex. Boiling point, density, color
In a chemical reaction, the ________________ are on the left side of the arrow and the _______________ are on the right side.
reactants, products
Which one of the following is a solution?
Air chicken noodle soup
Iron fillings and sand muddy water
Air
A scientific law is
Laws states what has happened, are based on repeated experiments and vast observational evidence gathered over many years
Describe the particles in steel
close together,compact, vibrating in place
List 3 examples of chemical properties
ability to combust, reactivity to acids, flammability, reactivity to oxygen, toxicity
True or False
During a chemical reaction the mass of the product is more than the mass of the reactant
False
Which technique uses a porous barrier to separate a solid from a liquid?
Filtration
What is chemistry the study of?
Properties, structure and changes in matter
True or False:
Chemistry is a fun subject to learn
True :)