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atomic mass is determined by the number of protons and neutrons & atomic number is only determined by the number of proton of an element | the difference between atomic mass and atomic number is the number of the neutrons in an element |
a electron has a negative -1 electric charge & an electron is a kind of charged particle | an electron is a kind of negatively charged particle |
an electron is a kind of negatively charged particle & electrons are a part of an atom | electrons are part of an atom that is negatively-charged |
electrons are part of an atom that is negatively-charged & electrons are involved in chemical reactions | negatively charged particles are involved in chemical reactions |
a point is small in size & an atom is exceptionally small in size | atoms are similar in size with points |
atoms are similar in size with points & angstrom unit is used to measure the distance between two points | angstrom units can be used to measure the distance between atoms |
atoms in a gas move independently of one another & atoms in a gas collide frequently & the atoms in a substance move independently of ont another and collide frequently | the substance is likely a gas |
baking is when a human makes food by adding heat & a cake is a kind of food | baking cake is adding heat to the cake |
baking cake is adding heat to the cake & adding heat to an object causes chemical reactions | baking a cake can cause a chemical reaction to the cake |
placing a blanket on fire cuts off the oxygen & a fire requires oxygen to burn | placing a blanket on fire cuts off the oxygen required for fire to burn |
placing a blanket on fire cuts off the oxygen required for fire to burn & if something is required for a process then keeping that something from reaching that process can stop that process | placing a blanket on fire will stop the fire from burning |
the drain cleaner is added into water & a drain cleaner consists of sodium hydroxide and aluminum | sodium hydroxide, aluminum, and water are combined |
sodium hydroxide, aluminum, and water are combined & hydrogen is produced | hydrogen is produced when sodium, aluminum, and water are combined |
sodium hydroxide, aluminum, and water are combined & the solution becomes really hot | heat energy is released when sodium hydroxide, aluminum, and water are combined |
hydrogen is produced when sodium, aluminum, and water are combined & heat energy is released when sodium hydroxide, aluminum, and water are combined | a chemical reaction happened when sodium hydroxide, aluminum, and water are combined |
iron is a kind of metal & nails are often made of iron | nails are made of metal |
nails are made of metal & metals in contact with water and oxygen will rust | nails in contact with water and oxygen will rust |
nails in contact with water and oxygen will rust & rust forming is a kind of chemical change | nails rusting is a kind of chemical change |
nails rusting is a kind of chemical change & chemical change is a kind of chemical reaction | nails rusting is a kind of chemical reaction |
carbon dioxide is a kind of gas & baking soda can react chemically with vinegar producing carbon dioxide | baking soda can react chemically with vinegar producing a gas |
vinegar is a kind of substance & baking soda is a kind of substance | combining baking soda and vinegar is combining two substance together |
baking soda can react chemically with vinegar producing a gas & combining baking soda and vinegar is combining two substance together | combining baking soda and vinegar can cause chemical reactions |
combining baking soda and vinegar can cause chemical reactions & vinegar is added into baking soda | vinegar being added into baking soda will cause chemical reactions |
chlorine is a kind of element & sodium is a kind of element | sodium and chlorine are two elements |
sodium and chlorine are two elements & sodium chloride is always made of chemically combined chlorine and sodium | sodium chloride is made of two elements chemically combined |
sodium chloride is made of two elements chemically combined & a compound is made of two or more elements chemically combined | sodium chloride is a compound |
sodium chloride is a compound & sodium and chlorine reacting forms sodium chloride | sodium and chlorine reacting forms a compound |
chemical reactions do not cause the total number of atoms to change & photosynthesis is a kind of chemical reaction | the total number of atoms stay the same in chemical reaction |
the total number of atoms stay the same in chemical reaction & photosynthesis is a kind of chemical reaction | the total number of atoms stay the same in photosynthesis |
the total number of atoms stay the same in photosynthesis & 6 atoms of carbon involves in photosynthesis & carbon is a kind of atom | the number of carbon atoms stays at 6 in photosynthesis |
iron in contact with water and oxygen will rust & rust forming is a kind of chemical change | iron in contact with water and oxygen is a chemical change |
iron in contact with water and oxygen is a chemical change & chemical change is a kind of chemical reaction | iron in contact with water and oxygen is a chemical reaction |
iron in contact with water and oxygen is a chemical reaction & chemical reactions cause new substances to form | iron in contact with water and oxygen will form new substance |
zinc chloride and hydrogen gas are new substances & hydrochloric acid combing with zinc forms zinc chloride & hydrochloric acid combing with zinc forms hydrogen gas | hydrochloric acid combing with zinc forms new substances |
hydrochloric acid combing with zinc forms new substances & chemical reactions cause new substances to form | hydrochloric acid combining with zinc is an example of chemical reaction |
iron in contact with water and oxygen will rust & rust forming is a kind of chemical change | iron in contact with water and oxygen causes a chemical change |
iron in contact with water and oxygen causes a chemical change & chemical reactions cause chemical change | iron in contact with water and oxygen is an example of chemical reactions |
100 grams vinegar and 5 grams baking soda are combined in a container & baking soda can react chemically with vinegar | a chemical reaction happens between baking soda and vinegar |
a chemical reaction happens between baking soda and vinegar & the mass of the reactants of a chemical reaction equals to the products of the chemical reaction | the mass of baking soda and vinegar is equal to the product of the chemical reaction |
gas is produced in the chemical reaction between baking soda and vinegar & gas is trapped in the container & if gases are released by a chemical reaction then the total mass of the product will be less than the total mass of the reactants | the mass of the final product of the baking soda and vinegar will not be less than the mass of the reactants |
the mass of baking soda and vinegar is equal to the product of the chemical reaction & the mass of the final product of the baking soda and vinegar will not be less than the mass of the reactants | the mass of the final product of the baking soda and vinegar will be the same as that of baking soda and vinegar |
100 grams plus 5 grams equals to 105 grams & baking soda is 5 grams & vinegar is 100 grams | the mass of vinegar and baking soda is 105 grams |
the mass of the final product of the baking soda and vinegar will be the same as that of baking soda and vinegar & the mass of vinegar and baking soda is 105 grams | the product of the chemical reaction will be 105 grams |
water is a kind of liquid at room temperature & water is a kind of compound | water is a liquid compound at room temperature |
water is made of hydrogen and oxygen & hydrogen is a kind of gas at room temperature & oxygen is a kind of gas at room temperature | water can be made by two gases hydrogen and oxygen |
water is a liquid compound at room temperature & water can be made by two gases hydrogen and oxygen | water is the liquid compound that can be made by two gases hydrogen and oxygen |
water is the liquid compound that can be made by two gases hydrogen and oxygen & liquid state is a kind of nongaseous state | water is the nongaseous compound that can be made by two gases |
substance y and substance z cannot be broken into simpler particles & an element cannot be decomposed into two or more different substances by simple chemical methods | substance y and substance z are elements |
a balloon is a kind of container & a balloon filled with helium | a balloon filled with helium is an example of a container filled with helium |
helium is a kind of element & elements are pure substances | helium is a pure substance |
a balloon filled with helium is an example of a container filled with helium & helium is a pure substance | a balloon filled with helium is an example of a container filled with a pure substance |
iron is a kind of element & rust is made of iron and oxygen & oxygen is a kind of element | rust is made of iron and oxygen elements |
table salt is sodum chloride & sodium chloride is always made of chemically combined chlorine and sodium | table salt is the product of sodium and chloride chemically combined |
the chemical formula of water is h2o & the number in chemical formula shows the number of atoms of each element in a molecule | the number in chemical formula of water shows the number of atoms of each element in a water molecule |
the number in chemical formula of water shows the number of atoms of each element in a water molecule & water is made of hydrogen and oxygen | the number in chemical formula of water shows the number of hydrogen and oxygen in a water molecule |
the number in chemical formula of water shows the number of hydrogen and oxygen in a water molecule & the chemical formula of water is h2o | a molecule of water is made of 2 hydrogen atoms and 1 oxygen atom |
the elements in the chemical reaction stays the same after the reaction & oxygen reacts with iron to produce rust | iron and oxygen elements stay the same after the reaction |
the elements in the chemical reaction stays the same after the reaction & oxygen reacts with hydrogen to produce water | oxygen and hyrdrogen elements stay the same after the reaction |
iron and oxygen elements stay the same after the reaction & oxygen and hyrdrogen elements stay the same after the reaction | the elements of two reactions stay the same |
sugar is made of carbon, hydrogen, oxygen chemically combined & carbon is a kind of element & hydrogen is a kind of element & oxygen is a kind of element | sugar is made of three different elements chemically combined |
sugar is made of three different elements chemically combined & a compound is made of two or more elements chemically combined | sugar is a kind of compound |
organic compounds mainly are made of carbon / hydrogen / oxygen / nitrogen & hydrogen is a kind of element | hydrogen can be found in organic compounds |
first-aid instant cold pack is a kind of cold pack & cold pack reaction is a kind of endothermic reaction | first-aid instant cold pack is a kind of endothermic reaction |
an atom is a kind of object & structure is a property of an object | structure of an atom is a property of the atom |
structure of an atom is a property of the atom & organizing is sorting things in order by their properties | structure of atoms can be used to organize atoms in order |
structure of atoms can be used to organize atoms in order & atoms of different elements have different structures | structure of atoms of different elements can be used to organize atoms of different elements |
elements from the same group in the periodic table are chemically reactive in a similar way & alkaline earth metals are highly chemically reactive | elements that belong to alkaline earth metals are highly chemically reactive |
elements that belong to alkaline earth metals are highly chemically reactive & magnesium belongs to alkaline earth metal family , group 2 on the periodic table | magnesium is highly chemically reactive |
magnesium is a kind of alkaline earth metal & fluorine is a kind of gas & magnesium and fluorine react chemically producing magnesium fluoride | magnesium fluoride is a new substance produced by magnesium and fluorine reacting chemically |
magnesium fluoride is a new substance produced by magnesium and fluorine reacting chemically & chemical reactions cause new substances to form | a chemical reaction happened between magnesium and fluorine |
a chemical reaction happened between magnesium and fluorine & combining two substances chemically causes chemical reactions | a chemical reaction is caused by magnesium and fluorine combined chemically |
an element cannot be decomposed into two or more different substances by simple chemical methods & sulfur cannot be decomposed into different substances by simple chemical methods | sulfur is a kind of element |
iron oxide / rust / fe2o3 is made of iron and oxygen & the chemical symbol for oxygen is o & the chemical symbol for iron is fe | the chemical symbols for the elements found in iron oxide is fe and o |
the atom is the smallest particle that has the properties of an element & gold is a kind of element | gold atom is the smallest particle that can be classified as gold |
iron is a kind of element & the chemical symbol for iron is fe | fe is the chemical symbol for iron element |
elements in the same group on the periodic table of elements have similar properties & chemical reactivity is a property of elements and includes ordered values of reactive / unreactive | elements from the same group on the periodic table are similar in chemical reactivity |
if something is made of something else , then that something else will be the component of that something & organic compounds mainly are made of carbon / hydrogen / oxygen / nitrogen | oxygen is a component of organic compounds |
oxygen is a component of organic compounds & a component of something means a part of something | oxygen is a part of organic molecules |
oxygen gas is made of only oxygen element & if a substance is made of one element , then the substance is called an element | oxygen gas is an element |
oxygen gas is an element & o2 is a chemical formula for oxygen gas | o2 is an element |
state of matter is a property of matter and includes ordered values of solid / liquid / gas & hydrogen is a kind of gas at room temperature | the state of matter of hydrogen is gas |
the state of matter of hydrogen is gas & state of matter is a kind of physical property | being a gas is a physical property of hydrogen |
the periodic table of elements can be used for predicting the properties of an element & a periodic table is a kind of scientific model | a periodic table is the scientific model that can be used to predict the properties of an element |
an element is identified by its number of protons & proton is a kind of subatomic particle | an element is identified by the proton number |
an element is identified by the proton number & gold is a kind of element | gold element can be identified by its proton number |
elements in the same group on the periodic table of elements have similar properties & calcium / beryllium belongs to alkaline earth metal family , group 2 on the periodic table | beryllium has the most similar chemical properties to calcium |
the chemical symbol for tellurium is te & tellurium is a kind of metalloid | te is a kind of metalloid |
antimony is a kind of metalloid & the chemical symbol for antimony is sb | sb is a kind of metalloid |
te is a kind of metalloid & sb is a kind of metalloid | sb and te are both metalloids |
elements from the same group in the periodic table are chemically reactive in a similar way & elements are all from the first group of the periodic table | elements from the first group are chemically reactive in a similar way |
elements from the first group are chemically reactive in a similar way & if the elements have similar chemical reactivity , then the elements will react with other elements in a similar way | elements from the first group will react with other elements in a similar way |
elements from the first group will react with other elements in a similar way & oxygen is a kind of element | elements from the first group will react with oxygen in a similar way |
if the elements have similar electron configurations , then the elements will be grouped into same family / group on the periodic table of elements & strontium, barium, and radium have similar electrom configurations | strontium, barium, and radium are grouped together on the periodic table |
elements in group 18 have complete outer electron shells on the periodic table of elements & helium / neon / argon / krypton / xenon / radon belongs to noble gases family , group 18 on the periodic table | helium, neon, argon, krypton, xenon, and radon have complete outer electron shells |
helium, neon, argon, krypton, xenon, and radon have complete outer electron shells & if the outermost electron shell of an atom is complete, then the element of those atoms will not react with other elements easily | helium, neon, argon, krypton, xenon, and radon will not react with other elements easily |
elements in the same group on the periodic table of elements have similar properties & a physical property is a kind of property | elements in the same group in the periodic table will have similar physical properties |
nitrogen and phosphorus belongs to nitrogen family , group 15 on the periodic table & elements in the same group on the periodic table of elements have similar properties | nitrogen and phosphorus will have similar properties |
nitrogen and phosphorus will have similar properties & the chemical symbol for nitrogen is n & the chemical symbol for phosphorus is p | n and p will have similar properties |
the outer electron shell is a part of the electron configuration & elements in group 18 have full / complete outer electron shells on the periodic table of elements | elements in group 18 have similar electron configuration |
elements in group 18 have similar electron configuration & if the elements have similar electron configurations , then the elements will be grouped into same family / group on the periodic table of elements | elements in group 18 are grouped together because they have similar electron configuration |