chapter 2 jeopardy review
TRANSCRIPT
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Atomic Chem General Chem Water Chem Energy Misc.
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What 2 subatomic particles are contained in an atom’s nucleus?
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Protons and Neutrons
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What two subatomic particles must differ in number in order to have an
ion?
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Protons and Electrons
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The atomic number of an element is always the same
as the number of this subatomic particle.
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Protons= Atomic Number
This is why you look for the number of protons when you are identifying an atom on a
drawing
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What do you call atoms of an element that contain different
numbers of neutrons?Example: carbon-12 and
carbon-14
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Isotopes
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Strontium (Sr) has a mass number of 88 and an atomic
number of 38. Give the number of protons, electrons,
and neutrons in an atom of Strontium.
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Protons = 38Electrons = 38Neutrons = 50
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How many valence electrons does an atom of phosphorus
(P) have?
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5 valence electrons
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_______________ are made up of atoms of two or more
elements in fixed proportions.
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Compounds
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Why are the noble gases stable?
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A noble gas is stable because its outer electron energy level is full (has maximum number
of valence electrons).
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Na2CO3 is the chemical formula for sodium
carbonate. How many atoms of each element are present
in sodium carbonate?
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Na = 2C = 1O = 3
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Differentiate between covalent and ionic bonds.
Hint: What is going on with the electrons in each type of
bond?
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•In covalent bonds, electrons are shared.•In ionic bonds, one atom donates its electrons, becoming a positive ion. The other atom accepts the electrons, becoming a negative ion. The ions of opposite charges are then attracted to one another.
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Water is referred to as a __________ molecule
because it has an unequal distribution of electrical
charge.
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polar
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What is the term for water molecules being attracted to any other substance? Hint: This is what happened when
we dropped water on the glass slide.
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Adhesion
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Do lipids dissolve in water?
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No! Lipids do not dissolve in water because they are
nonpolar.
Ionic compounds and polar molecules dissolve best in
water.
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Did the paperclip float? Explain what water
properties contributed to the results we saw in the lab.
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It did not float. It sat on top of the water due to water’s surface tension. Surface tension is the result of
cohesion between water molecules. Cohesion or
sticking together of water molecules is caused by
hydrogen bonding.
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Differentiate between acids and bases. Hint: What ions
are released in water and what are their pH values.
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•Acids form H+ when dissolved in water. They have pH values below 7.•Bases form OH- ions when dissolved in water. They have pH values above 7.
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Define energy
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The ability to do work (move or change matter).
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What is the name for the starting materials in chemical
reactions?
What is the name of the newly formed substances in
chemical reactions?
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Reactants = starting materials
Products = newly formed substances
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What name is given to the energy needed to start a
chemical reaction?
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Activation energy
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Define an enzyme (what does it do?)
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Enzymes are biological catalysts that increase the
speed of chemical reactions. Catalysts reduce the
activation energy of a chemical reaction.
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Name the 4 types of Energy inBiological Systems
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Chemical Energy
Thermal Energy
Electrical Energy
Mechanical Energy
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What is defined as, “anything that occupies space and has mass?’
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Matter
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What are the weak interactions that allow water
to cohere and adhere?
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Hydrogen Bonds
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What is a strong bond in which
valence electrons are shared?
Name the 3 types of these bonds
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Covalent Bond
Single covalent bond (2 electrons shared)
Double covalent bond (4 electrons
shared)Triple covalent bond (6 electrons shared)
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The force that describes attractionbetween molecules of the same
substance.
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Cohesion
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What is an acid-base indicator ?
Name 3 natural acid-base indicators.
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An acid-base indicator is a dye used todistinguish between acidic and basic
solutions by means of the color changes it undergoes in these solutions.
3 Natural Examples:• tea
• red cabbage juice• concord grape jelly