Show:
Law of Conservation of Matter
Atoms, Molecules,Elements, Mixtures, and Compounds
Physical vs. Chemical changes and properties
Periodic Table
States of Matter
100
. Which statement is correct concerning the mass of a ball of clay? A. The mass changes as the altitude of the ball of clay changes. B. The mass changes as the shape of the ball of clay changes. C. The mass of the ball of clay is unchanged by altitude or shape. D. The mass is doubled when the ball of clay is divided into two equal pieces.
What is C. the mass of the ball of clay is unchanged by altitude or shape.
100
Name the subatomic particles of the atom from the smallest to the largest.
What is the electron, proton, neutron
100
Is density a chemical or physical property?
What is a physical property.
100
How many electrons are present in a neutral atom of Magnesium?
What is 12 electrons
100
A hot air balloon rises because A. molecules become lighter when heated B. molecules move faster and farther apart when heated C. molecules are less attracted by gravity when heated D. molecules become charged and repel each other when heated
What is molecules move faster and farther apart when heated.
200
Na + Cl = NaCl 23g +17g ?
What is 40 grams
200
Copper is an element that is used in electrical wires. What is the smallest unit of copper that still maintains the characteristics of copper?
What is an atom.
200
What are the units for density?
What is grams/ cm3
200
In what group are the noble gases located?
What is group 18.
200
True/ False. Particles that make up matter are in a state of constant motion.
What is true.
300
What is the substance that exists before a chemical reaction begins?
What is the reactant.
300
Which of the following is considered to be a molecule only? A. H₂ B. NaCl C. CH₄ D. H₂O₂
What is H2
300
Which is not a physical property of silver? A. Silver is white B. The density is 10.49 g/cmŸ C. The melting point is 962” C D. Silver does not react with water
What is silver does not react with water
300
The atomic number is the same as the number of what particles?
What is protons.
300
Why would ice cubes float in a glass of water?
What is because the ice cubes are less dense than the glass of water.
400
The total mass of a box was 155 grams before a reaction what will the total mass of the box be after the reaction is completed?
What is 155 grams.
400
Is carbon dioxide considered to be a mixture or compound?
What is a compound.
400
True/False. Different kinds of molecules are present after a physical change but not after a chemical change.
What is False
400
How many neutrons are present in Vanadium? (round to the nearest whole number)
What is 28.
400
Explain how the particles of each of the 3 states of mater move.
What is solids vibrate in place, liquids slide past each other, and gases move freely.
500
Is the following equation balanced why or why not? CH3COOH + NaHCO3→ CH3COONa + H2O + CO2
What is yes because the number of atoms of elements on both sides are equal.
500
Is air considered to be a mixture or compound?
What is a mixture
500
Would absorption or release of energy in the form of light, heat, or sound be a physical or chemical change?
What is a chemical change.
500
The element Silicon ( Si, atomic number 14 and atomic mass 28) is right above Germanium (Ge, atomic number 32 and atomic mass 73) in the periodic table. How many more electrons does germanium have than silicon?
What is 18 electrons.
500
Name the two types of solids.
What is amorphous and crystalline.