Chem~Chapter 2 Review
What is a pure substance?
1 element or 1 compound?
How many atom are there in one molecule of H^2SO^4?
7 atoms
What are the similarities and differences between a mixture and a compound?
Both have a combination between 2 or more substances mixture: physical combination compound: chemically
When a mixture is separated, are new elements/compounds formed?
No
What is crystallization?
a separation technique that is used to separate a solid that has dissolved in a liquid and made a solution
What do you do to get to Kelvin?
add 273
What is the law of conservation of matter?
cannot be created nor destroyed
Is a chemical reaction a chemical or physical change?
chemical
Is baking soda and vinegar a chemical or physical change?
chemical
Is burning wood a chemical or physical change?
chemical
Is iron rust a chemical or physical change?
chemical
How can a compound be separated into a simpler substance?
chemical change
What is a chemical change?
chemical change is the breaking and forming resulting in new compounds and elements
What is the extrinsic property?
does depend on the amount of the substance
What is the intrinsic property?
does not depend on the amount of the substance
What is the difference between an element and a compound?
element: cannot be separated into a simpler substance, it has no bonds and can be made up of ONLY ONE kind of atom. compound: 2 or more substances chemically combined, has bonds, and can be made up of more than one atom.
What is deposition?
gas to solid
Is chocolate chip cookie dough a pure substance, homogenous mixture, or heterogenous mixture?
heterogenous
Is cookie dough a pure substance, homogenous mixture, or heterogenous mixture?
heterogenous
Is granite a pure substance, homogenous mixture, or heterogenous mixture?
heterogenous
Is steel a pure substance, homogenous mixture, or heterogenous mixture?
heterogenous
Is Kool aid a pure substance, homogenous mixture, or heterogenous mixture?
homogenous
Is Xenon gas a pure substance, homogenous mixture, or heterogenous mixture?
homogenous
Is air a pure substance, homogenous mixture, or heterogenous mixture?
homogenous
Is salt water a pure substance, homogenous mixture, or heterogenous mixture?
homogenous
Is water a pure substance, homogenous mixture, or heterogenous mixture?
homogenous
How tightly packed are the particles in a liquid? Does a liquid have a definite shape? Does a solid have a definite volume?
less tightly packed; less density no definite shape yes definite shape
How tightly packed are the particles in a gas? Does a gas have a definite shape? Does a solid have a definite volume?
not packed at all; low density no definite shape yes definite shape
How tightly packed are the particles in a solid? Does a solid have a definite shape? Does a solid have a definite volume?
packed tightly, high density. yes has a definite shape yes has a definite volume
What is filtration?
passing mixture over small holes that allows liquid to pass but not the solids
Is boiling water a chemical or physical change?
physical
Is gasoline evaporates a chemical or physical change?
physical
Is making a smoothie a chemical or physical change?
physical
Is steel melting a chemical or physical change?
physical
Is C^6H^12O^6 a pure substance, homogenous mixture, or heterogenous mixture?
pure substance
Is Sodium Chloride a pure substance, homogenous mixture, or heterogenous mixture?
pure substance
What is chromatography?
separation technique that is used to separate and identify the components of a mixture
What is precipitate?
solid that forms from a liquid solution
What is sublimation?
solid to gas
What is distillation?
take advantage of boiling points
What is temperature?
the measure of the average kinetic (movement) energy of molecules/atoms
What happens to the water molecules when a liquid water is boiled?
vibrate and move really fast, which leads to them moving father apart and release into the air
Are new elements/compounds formed when a compound is separated into a simpler substance?
yes