periodic table
what is this elements name -- Cl?
what is an intensive property?
A property of a substance that does not depend on the amount of material chosen.
what is a diatomic element?
element that is never found by itself in nature, its bonded to another like atom... -- H2
True or false- oil and water in the same cup is a homogeneous mixture
false
what are the 3 states of matter?
solid, liquid, gas
formula for mass when given density and volume.
mass= density x volume
false. they are significant. zero between nonzero digits are significant.
What is this elements name-- Hg?
mercury
give an example of an extensive property?
mass, volume, height, amount of energy
true or false-- CH4 is a compound
true
True or false- salt water that has excess salt laying at the bottom of the cup is a heterogeneous mixture
true
true or false- the atoms in a solid have no kinetic energy
false - always some residual kinetic energy
true or false- 1 ml = 1 cm3
True- can use cubic centimeters interchangeably with liters.
NO they are not significant. zeros to the left of the first nonzero digit are not significant.
how do you find how many neutrons are in an element given the amount of protons and the atomic mass?
subtract the atomic mass from the atomic number, which will give you the amount of neutrons.
what kind of change in a substance involves changing the basic identity of the substance?
chemical change
True or false- these are all diatomic elements
-H2 O2 F2 N2 Cl2 Br2 I2
true! those are all the diatomic elements.
filtration is used to separate what kind of mixtures?
heterogeneous mixtures
true or false- when water freezes into ice, the volume decreases
false-- volume increases when water freezes because water expands into ice.
true or false - the freezing point of water is 273.15 kelvin
True. freezing point of water is 0 degrees celsius, and 273.15-273.15 = 0.
How many sig figs are in this number?
00.0002300027500
10 sig figs!
what is the most electronegative element? or which element has the highest electronegativity?
Flourine
is density an extensive or intensive property?
it is intensive. but mass and volume are both extensive.
give me an example of a molecule that is not a compound
diatomic elements
what is an example of a pure substance that is a compound?
water.
Pure compounds are created when elements combine permanently, forming one substance
liquid
true or false- farenheit to celsius formula is
F= 5/9 (C-32)
False it is
F = 9/5 (C) + 32
How do you determine how many significant figures to have in your answer in a problem involving multiplication and division?
The result must have no more significant figures than the number in the problem with the fewest amount of significant figures.
What does the column that the element is in say about the electrons of the element?
How many valence electrons there are.
what is this definition referring to? "describes the way a substance may change or react to form another substance"
chemical properties
What kind of forces hold different molecules together?
true or false- salt and water homogenerous mixture can be separated through filtration
false.
true or false- the temperature during a phase change of ice to water is increasing
false- temperature stays the same during phase changes.
Why is the kelvin scale necessary ?
The Kelvin temperature is an absolute temperature scale. Explanation: The Kelvin scale starts at absolute zero. 0 degrees Kelvin represents zero kinetic energy or temperature.
What is the purpose of significant figures?
they are a shorthand method of communicating the uncertainty of a measurement.