Ch 13 chem bond

Ch 14 chem rxn

Ch 9 Heat

Ch 24 Waves Stars

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Question 1 - 10

• Fluorine, F, forms a binary ionic compound with lithium, Li. What is the name of this compound?

Answer 1 – 10

• lithium fluoride

Question 1 - 20

• Sodium forms an ionic bond with chlorine when sodium ____ an electron and chlorine ____ an electron.

Answer 1 – 20

• Loses• Gains

Question 1 - 30

• a metalloid and oxygen will form what type of bond?

Answer 1 – 30

• colvalent

Question 1 - 40

• Identify the ions in The compound CaCl2

Answer 1 – 40

• Ca2+ and Cl-

Question 1 - 50

• Beryllium, Be, and chlorine, Cl, form a binary ionic compound with a one-to-two ratio of beryllium ions to chloride ions. Identify the formula for the compound

Answer 1 – 50

• BeCl2.

Question 2 - 10

• Identify the law that explains why the total amount of energy before and after a chemical reaction is the same.

Answer 2 – 10

• Law of conservation of energy

Question 2 - 20

• In terms of energy, classify the following chemical reaction

• 2Cu + O2 ® 2CuO + 315 kJ (energy)

Answer 2 – 20

• exothermic

Question 2 - 30

• 50 percent of a radioactive element to decay into something else.

Answer 2 – 30

• Half life

Question 2 - 40

• Balance the following equation to show the Law of Conservation of Mass and identify the type of reaction it is.

• ____CS2 + ___O2 ___CO2 + ___SO2

Answer 2 – 40

• 1,3,1,2• Single replacement

Question 2 - 50

• Differentiate between fusion and fission and give an example of each

Answer 2 – 50

• Fusion – 2 become one (sun) • Fission – one becomes 2 (nuclear power

plants)

Question 3 - 10

• Heat is the transfer of thermal energy from one object to another because

Answer 3 – 10

• Difference in temperature

Question 3 - 20

• Define what an insulator and a conductor are and give an example of each that are used in everyday life.

Answer 3 – 20

• Insulator – poorly transfers heat energy• Conductor – transfers heat energy well

Question 3 - 30

• Identify the evidence that supports the fact that desert sand is very hot in the day and very cold at night

Answer 3 – 30

• Low specific heat

Question 3 - 40

• Explain how the transfer of heat energy when you put ice in a drink to cool it off

Answer 3 – 40

• heat is transferred from the warmer drink to the cooler ice.

Question 3 - 50• The diagram represents two blocks whose

temperatures are indicated by thermometers. Use the diagrams to answer the questions below.

• In which direction will the heat move between blocks A and B in?

• At what point will the heat transfer between blocks A and B stop?

Answer 3 – 50

• Heat will move from block A to B.

• Heat transfer will stop when blocks A and B reach the same temperature, called thermal equilibrium.

Question 4 - 10

• When a wave strikes a solid barrier, it behaves like a basketball hitting a backboard. This wave behavior is called

Answer 4 – 10

• reflection

Question 4 - 20

• For refraction to occur in a wave, the wave must

Answer 4 – 20

• enter a new medium at an angle.

Question 4 - 30

• You are still able to hear sounds coming from a room when the door is open only a tiny crack due to:

Answer 4 – 30

• Diffraction

Question 4 - 40

• Two large waves on the ocean come together on the ocean’s surface to form a gigantic wave. The interaction responsible for this is called:

Answer 4 – 40

• Constructive interference

Question 4 - 50

• The electromagnetic wave with the longest wavelength is a(n):

Answer 4 – 50

• Radio wave

Question 5 - 10

• What is the difference between a blue giant star and a red giant star?

Answer 5 – 10

• Blue – hotter, more massive than sun• Red – cooler, similar to mass of the sun

Question 5 - 20

• Put the following in the proper order of events according to the Big Bang.

• Rapid expansion of the Universe• First galaxies form• First gas clouds form• First atoms form• First stars form

Answer 5 – 20

• Rapid expansion of the universe• First atoms form• First gas clouds form• First stars form• First galaxies form

Question 5 - 30

• What two observations support the idea of an expanding universe?

Answer 5 – 30

• Red shift • Hubble’s law

Question 5 - 40

• What does this diagram indicate about the galaxies?

Answer 5 – 40

• According to the big bang theory the galaxies are moving farther apart

Question 5 - 50

• According to the Absorption spectrum of visible light how can one detect that a star is moving away from the earth?

Answer 5 – 50

• The lines of the star on an absorption spectrum will be shifted toward the red end (higher wavelengths)