Heat 15.8 g potassium pomegranate until no more oxygen gas is given off. the remaining material has a mass of 14.2 g or mass of oxygen gas produced in the reaction
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chemistry ch 4
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According to the conservation of mass when water freezes into ice the amount of mass of the ice would be
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equal to that of the water
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Law of Conservation of Mass
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A specific amount of water would have the same mass even if you turned it from a liquid to a solid or a gas is an example of which law
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According to the conservation of mass when water freezes into ice the amount of mass of the ice would be
equal to that of the water
Law of Conservation of Mass
A specific amount of water would have the same mass even if you turned it from a liquid to a solid or a gas is an example of which law
A reaction between sodium hydroxide and hydrogen chloride gas produces sodium chloride and water. A reaction of 22.85 g of sodium hydroxide with 20.82 g of hydrogen chloride gives off 10.29 g of water. What mass of sodium chloride is formed in the reaction?
20.82g (Law of Conservation of Mass)
A reaction between copper oxide and hydrogen gas produces copper and water. A reaction of 12.640 g of copper oxide with 0.316 g hydrogen chloride gives off 2.844 g of water. What mass of copper is formed in the reaction? ___ g
10.112 (Law of Conservation of Mass)
When heated, calcium hydroxide and ammonium chloride react to produce ammonia gas, water vapor, and solid calcium chloride. Suppose 5.00g of calcium hydroxide and 10.00g of ammonium chloride are mixed in a test tube and heated until no more ammonia is give off. The remaining material in the test tube has a mass of 1.27 g. What total mass of ammonia and water vapor was produced in the reaction?
13.73g (Law of Conservation of Mass)
A reaction between ammonia gas and chlorine gas produces ammonium chloride and nitrogen gas. A reaction of 17.0 g of ammonia with 26.6 g of chlorine gas gives off 3.5 g of nitrogen. What mass of ammonium chloride is formed in the reaction?
40.1g (Law of Conservation of Mass)
Hydrogen and oxygen undergo a chemical reaction to form water. How much water would form if 2.56 g of hydrogen reacted completely with 20.32 g of oxygen?
22.88g (Law of Conservation of Mass)
A reaction of heating potassium permanganate produces potassium manganate, manganese dioxide and oxygen gas. Heat 15.8 g potassium permanganate until no more oxygen gas is given off. The remaining material has a mass of 14.2 g. What mass of oxygen gas was produced in the reaction?
1.6g
Law of Conservation of Mass
(Lavoisier)
Matter is not created nor destroyed in any chemical or physical change (which states that during a chemical reaction, the total mass of the products must be equal to the total mass of the reactants)
Law of Definite Proportions
A given chemical compound always contains the same elements in the exact same proportions by mass
The percent by mass of sodium in table salt (NaCl) is 39.34 %. What is the percent by mass of chlorine?
60.66 % (Law of Definite Proportions)
True or False
The law of definite proportions is only applicable when the elements which are reacting together form the same product.
True
Law of Multiple Proportions
Whenever the same two elements form more than one compound, the different masses of one element that combine with the same mass of the other element are in the ratio of small whole numbers
Atoms cannot be
subdivided, created, or destroyed
Cathode rays are actually a stream of
electrons
What makes an atom electrically neutral?
# of electrons = # of protons
electron orbital
The region in an atom where an electron is most likely to be
valence electrons
Electrons on the outermost energy level of an atom
As an electron moves further away from the atom's nucleus, its energy
increases
A nucleus with four protons has a total electrical charge of
4
______________mcan be distinguished from each other by the number of protons in their atoms
elements
protons and neutrons location
Located in the nucleus of the atom
The mass of a neutron is close to the mass of
a proton
isotope
Atoms containing the same number of protons, but a different number of neutrons in the nucleus
mass number
the number of protons and neutrons in an atom
order of discovery of subatomic particles
electron, proton, neutron
the mass of an atom is measured in a unit named
atomic mass unit (amu)
atomic mass
The average mass of all the isotopes of an element
Dalton's Atomic Theory
- Atoms are indivisible
Atoms are not created or destroyed, just rearranged in chemical reactions.
(1808)
Who discovered the electron? plum pudding model?
J.J. Thomson - 1890s