Ch1&2 QUEST- Chemistry
The liter is defined as
1,000 cm³
two most important properties of all matter
1. takes up space 2. has mass
What is true about density?
Density is a physical property
a chemical change occurs when
a leaf changes color in the fall
Which part of the illustration below shows the particles in a heterogeneous mixture?
a.
The symbols for units of length in order from largest to smallest
km, m, cm, mm
matter includes all of the following except a) air b) light c)smoke d) water vapor
light
A state of matter in which a material has no definite shape but has a definite volume is the ____ state.
liquid
a measure of the quantity of matter is
mass
what is not an example of a unit
mass
A mixture is
material composed of two or more elements or compounds that are physically mixed together but not chemically combined
If repeated measurements agree closely but differ widely from the accepted value, these measurements are
precise, but not accurate
These values were recorded as the mass of products when a chemical reaction was carried out three separate times: 8.83 g; 8.84 g; 8.82 g. The mass of products from that reaction is 8.60 g. The values are
precise, but not accurate
an atom is
the smallest unit of matter that maintains its chemical identity
significant figures (sig figs) 0 rule
0- leading is NEVER 0- captive is ALWAYS 0- trailing is SOMETIMES only after decimal
qualitative data
Information describing color, odor, shape, or some other physical characteristic
a compound is
a substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances
Which of the following observations is quantitative? a)the liquid turns blue litmus paper red b) the liquid boils at 100 degrees Celsius c) the liquid tastes bitter d) the liquid is cloudy
b) the liquid boils at 100 degrees Celsius
The only pure substance listed below is... a) bread dough b) vinegar (5% acetic acid) c) vitamin C (ascorbic acid) d) seawater
c) vitamin C (ascorbic acid)
The metric unit for length that is closest to the diameter of a pencil is
centimeter
Which of the following is not a physical change a) grinding b) cutting c) boiling d) burning
d) burning
All of the following are SI units for density except a) kg/m^3 b) kg/L c) g/cm^3 d) g/m^2
d) g/m^2
Which of the following observation is qualitative? a) a chemical reaction was complete in 2.3 seconds b) the solid had a mass of 23.4 grams c) the pH of a liquid was 5 d) salt crystals formed as the liquid evaporated
d) salt crystals formed as the liquid evaporated
The density of an object is calculated by
dividing its mass by its volume
physical change occurs
glue gun melts a glue stick
quantitative data
has numbers in the data
If a mixture is not uniform throughout, it is called
heterogeneous
the SI base units for length and time are
meter and second
the symbol mm represents
millimeter
The SI base unit for time is the
second
the unit m^3 measures a. length b. area c. volume d. time
volume