Hughes' Final

ZnS+O2➡ZnO

not balanced

what type of bonding might you expect between two potassium atomic number 19

not ionic or nonpolar or polar covalent

why do nonpolar substances tend to boil at relatively low temperatures

not much heat is required to separate nonpolar molecules from each other

when two different elements combine to form a compound the resulting properties of a compound are

not necessarily anything like those of the two elements

can be made into thin sheets

physical

consider a ring with a gap in it when the ring is heated the Gap becomes

wider

compared to the mass of a hydrogen atom the mass of an oxygen atom is

16 times greater

what is the total number of protons and neutrons in a water molecule

18

the atomic size of an iron atom which has 26 protons and 27 neutrons in its nucleus is

26

which of these locations experiences the least change in

Hawaii

if two protons and two neutrons were added to oxygen the element resulting would be

Neon

which have been around longer the atoms in a newborn baby or those in the older person

about the same older than the solar system

most chemists focus on

applied research to provide us with new technology

explain why putting a dented ping pong ball in a pot of boiling water will help remove the dent

as air inside the ball is heated it expands and pushes outward on the dentist Boston a dented ping pong ball can be put back in a rounded shaped this way

pour a liter of water of 40 degrees C into a liter of water at 20 degrees C and the final temperature of the two becomes

at or about 30 degrees Celsius

during a chemical change

atoms change Partners to form a new material

3Fe2O3+C➡2Fe3O4+CO

balanced

CH4+2O2➡CO2+2H2O

balanced

if a pair of helium nuclei are fused together the result is

beryllium

if two protons and two neutrons were removed from oxygen the element remaining would be

carbon

turns into a white powder when heated in the presence of oxygen

chemical

if an element of atomic number 118 is ever synthesized it would be

chemically inert, a gas at room temperature and Radioactive

to slightly increase the volume of some 4 degrees Celsius water you should

cool or heat it

aluminum has a specific heat capacity more than twice that of copper Place equal masses of aluminum and copper wire in a flame and the one to undergo the fastest increase in temperature will be

copper

if you pour some 30 degree Celsius water into some 20 degrees Celsius water the final temperature

depend on the relative amounts of water

an infant gains 10lb why would you consider this to be an example of a chemical reaction

during a chemical change new materials are being formed which is certainly the case with a growing human being new hair new fingernails new skin new cells everywhere

atoms of a covalent bond are held together by the

electrical attraction two nuclei have for shared electrons

what elements tend to form ionic compounds

elements found on opposite sides of the periodic table

elements in what portion of the periodic table tend to form covalent bonds

elements in the upper right hand side

if room temperature water is put in a vacuum it rapidly boils. Then the boiling water turns into ice what is your explanation

evaporation has to do nothing with he input but I mastered pressure by decreasing atmospheric pressure evaporation increases because with less obstruction to the change in Phase more molecules are able to leave the water since evaporation and therefore boiling is a cooling process the more energetic one goes from water to vapor water temperature drops when the temperature drops to 0 degrees Celsius freezing that's why in a vacuum water will boil to form ice

true or false a sodium chloride is toxic because of the sodium metals that it contains

false

true or false chemical equations are balanced by modifying the subscripts of chemical formula data

false

true or false molecules are of the microscopic Realm

false

true or false protons and neutrons have the same magnitude of electric charge

false

true or false the freezing of water is an example of a chemical change

false

true or false total amount of all energies in a substance is its temperature

false

true or false water expands when heated from 0 degrees Celsius to 4 degrees Celsius

false

true or false when an atom loses an electron it becomes larger in size

false

which of these laws of thermodynamics has no exception

first law which is basically the law of conservation

the elements copper silver and gold are in the same

group

consider molecules of hydrogen gas and molecules of heavier oxygen gas that have the same kinetic energy the molecules with more speed are

hydrogen

from top to bottom in any given group atomic size

increases

for most all items compared with the atomic number the atomic mass is

larger

in the periodic table elements that are relatively larger in size appear in the

left part of the table

place a 1 kilogram block of aluminum at 30 degrees C into a liter of water at 20 degrees Celsius and the final temperature of the two becomes

less than 30 degrees C

are atoms made of molecules or are molecules made of atoms

molecules are made of atoms

why do we say electrons most affect an atom size of protons and neutrons most affect an atom's mass

most of the mass of an atom is in its nucleus each proton and neutron has amassed nearly that of an electron electrons around the nucleus determined in the items diameter electrons affect an atom size and nucleons its mass

classify flouroacetylene as a polar or non-polar compound

nonpolar

2NaHCO3➡Na2CO3+H2O+2CO2

not balanced

most of the mass of an atom is in its

nucleus

most of the size of an atom the space it occupies is in its

nucleus

to say a chemical equation is balanced means the

number of times each element appears as a reactant equals the number of times it appears as a product

explain what is meant by saying it's mometer measures its own temperature

objects in the same kalidy will ultimately come to the same temperature when hot things cool and cool things warm this is what if the monitor does thermometers come to thermal equilibrium with their surroundings and show this on their scale

a solid is not considered fluid because

of the fixed arrangement of its atoms or molecules

which is the most polar bond in the chemical structure shown below with 7 hydrogen 2 carbon 1 nitrogen and one oxygen

oxygen to hydrogen

conducts electricity

physical

turns into a silvery liquid when heated in the absence of oxygen

physical

a material made of which molecule should have the higher boiling point

picture with two chlorines two carbons and 2 hydrogens

keep heating a gas and you'll have a

plasma

the boiling temperature of water H2O is much higher than that of methane CH4 because water molecules are

polar

which would produce a more highly valued element adding or removing a proton from the element gold

removing a proton gold then turns into more valued Platinum adding a proton Turns Gold into Mercury which is this valuable

in the periodic table of the elements periods normally appear in

rows and groups in columns

the difference between a cup of hot chocolate and a cup of cold chocolate has to do with the differences in molecular

speeds

which will warm up faster on a sunny day the water in a puddle or the sand that surrounds the puddle

the sand

an individual carbon oxygen bond is polar yet carbon dioxide CO2 has two carbon oxygen Bonds is nonpolar because

the two carbon oxygen Bonds in CO2 are oriented 180 degrees from each other

distinguish between the concepts of heat temperature and thermal energy

thermal heat measured in calories are joules is the energy something has by virtue of the molecular motion of its molecules the more molecular kinetic energy the more thermal energy temperature is that kinetic energy per molecule in a substance measured in degrees or kelvin is a thermal energy that transfers from one place to another by virtue of the temperature difference heat like thermal energy is measured in calories to joules

a popular use of a bimetallic strip is in

thermostat

radon atomic number 16 is a radioactive noble gas helium is there a non radioactive noble gases are continually emitted from the surface of the Earth which has a greater tendency to settle into the basement of homes and why

they don't know have a greater tendency to set on the basements of homes because it is heavier basements therefore should be well ventilated helium is much lighter and tends to rise

the lanthanides and actinides are periods of elements that are difficult to purify

true

the noble gases are the least able to combine with other atoms

true

true or false a compound is made of atoms from different elements

true

true or false atoms may be held together by an exchange of electrons

true

true or false most of the atoms in the periodic table are metals

true

true or false polar molecules tend to be attracted to one another

true

true or false positive ions result from the loss of electrons

true

true or false solid matter is mostly empty space because the atoms that comprise that are themselves mostly empty space

true

true or false the energy that transfers from one object to another because of a temperature difference

true

true or false the first law of thermodynamics is simply the conservation of energy applied to Thermal systems

true

true or false there are two electrons for every covalent bond

true

true or false there is a lower limit to how cold something can be

true

the physical properties of a compound are

uniquely different from the physical properties of the elements from which it is made

when ice floats in water a small portion extends above the surface interestingly enough the volume of the ice extending above the surface is equal to the volume of the

vast number of open spaces in the hexagonal ice crystals