chemistry

how many significant figures are in the number 124.10?

5

how many sig figs are in the number 540, 962.17?

8

freezing point of water in celcius

10

what is the boiling point of water in celcius

100

boiling point of water in fahrenheit

212

what is freezing point of water in fahrenheit

32

how many sig figs are in the number 0.0001234?

4

which of the following is NOT a state of matter

density

this depends on the independent variable

dependent variable

this is put on the y-axis when graphing

dependent variable

a technique that uses the differences in boiling points to separate a liquid homogeneous mixture is

distillation

a material that cannot be broken down further by chemical means is an

element

type of colloid in which liquids that normally don't mix are spread throughout each other

emulsion

properties that depend upon the amount of substance present and have to be a "number" are

extensive properties

the mass of the football is 3.3 kilograms. this is an example of a

extensive property

collecting data from a line that goes BEYOND the plotted points on your graph is called this. it's really easy to make errors doing this

extrapolation

a technique that uses a porous barrier (like a strainer) to separate heterogeneous mixtures is

filtration

a __ is a form of matter that has a definite shape, and a definite volume

solid

sublimation is a process in which a __ changes to a __ without melting

solid, gas

substance that dissolves into a __ to form a solution

solute, solvent

which of the following is a vapor

steam

force acting on the particles at the surface of a liquid that causes a liquid to form round drops

surface tension

a __ is a type of heterogeneous mixture in which the LARGE particles of a material are more or less evenly dispersed throughout a liquid or gas

suspension

gaseous state of a substance that is a solid or liquid at room temp

vapor

groups are __ on the periodic table

vertical columns

which of the following is a compound

water

caused when a single light beam shines through a colloid. the light reflects off of the particles in the substance so that no single beam of light exits the substance

Tyndall Effect

a characteristic that can be observed or detected by using your senses and without changing the sample's composition is

a physical property

this term describes how close the number is to the correct or accepted value of a number. what term is this?

accuracy

done when you are using the knowledge that you have gained to solve a particular problem or answer a specific question

applied research

which of thses isn't a homogeneous mixture

oil and vinegar salad dressing

the __ is a chart that organizes all known elements into a grid of horizontal rows and vertical columns arranged by increasing atomic number

periodic table

a __ is a form of matter that doesn't have a definite volume, no definite shape, and is found in the stars and in lightning

plasma

this term that describes how close a group of measurements are together. they may be nowhere near the correct or accepted value of a number. what term is this?

precision

positive particles that are found inside the nucleus are called the

protons

done when you are just curious about a particular topic

pure research

which of the following is not a heterogeneous mixture

pure water

based upon observations using the senses (color, odor, etc)

qualitative

based upon a measurable amount of something or involves numbers

quantitative

which of the following is NOT a physical change

rotting food

which of the following is a heterogeneous mixture

samples of gaseous argon and solid iron in the same container

smallest particle of an element is called

atom

which of the following is the base unit for time

seconds

which person is responsible for creating the cathode tube which lead to the invention of the tv?

Crookes

which scientist discovered and studied radiation

Curie

this scientist was an english schoolteacher who came up with his own atomic theory

Dalton

which person was credited with being the first person to mention or name atom?

Democritus

the scientist that organized all of the elements into a periodic table is names

Dmitri Mendeleev

which of the following is the base unit for temperature

Kelvin

when one substance changes its identity or becomes a new substance, it goes through a

chemical changes

Fe2O3 is a

compound

seperation technique that produces highly pure solids that look like crystals. this is a good way to make rock candy

crystalization

which of the following is the base unit for length

meters

a __ is a form of matter that doesn't have a definite volume, doesn't have a definite shape, and its particles are spread apart from each other. the particles are whole and not broken apart

gas

substance that's naturally in the gaseous state at room temp

gas

periods are __ on the periodic table

horizontal rows

when two or more substances WON'T mix together easily, it's said that they are this

immiscible

this is controlled by the experiment or scientist

independent variable

this is put on the x-axis when graphing

independent variable

collecting data from a continuous line on the graph that isn't a specific point purposely plotted, but could be between points and connected by the points is called this

interpolation

which of the following is the base unit for mass

kilograms

the __ states that a compound is always composed of the same elements in the same proportions by mass, no matter how large or small the sample. the mass of the compound is equal to the sum of the masses of the elements that make up the compound

law of definite proportions

CO and CO2 are both examples of this law

law of multiple proportions

the __ states that different compounds are formed by the combination of the same elements, different masses of one element combine with the same mass of the other elements in a ratio of small whole numbers

law of multiple proportions

a __ is a form of matter that flows, has definite volume, and takes the shape of its container

liquid

which of the following is the base unit for volume

liters

which of the following isn't evidence that a chemical change has occured

melting

when one substance dissolves or mixes with another substance to form a solution, those substances are said to be

miscible