38795034
Descrição
FlashCards por Dana Cowan, atualizado 7 meses atrás
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Criado por Dana Cowan
mais de 1 ano atrás
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| Questão | Responda |
| In making a cake, which process involves a chemical change? a. mixing ingredients for the batter b. slicing strawberries for the topping c. spreading frosting on the cake d. baking the batter to form the cake | A chemical change means a NEW substance was created. That means that the only choice that is a chemical change is BAKING BATTER TO MAKE CAKE. |
| The diagram below shows the geometric structure of a molecule of water (H2O). What do the symbols (Black Circles) and (Grey Circle) represent in the model? a. genetic material b. cells c. chemical bonds d. atoms | The black and grey circles represent ATOMS |
| The law of conservation of mass can be demonstrated by a chemical reaction. Which of the following models of a chemical reaction best represents the law of conservation of mass? | The # of atoms on the reactants side (left side of arrow) has to be the same as the # of atoms on the product side (right side of arrow). This means the correct answer D...there are 2 white atoms and 1 grey atoms on each side of the arrow. |
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Which one of the following pictures shows the object that is the most dense?
Image:
Dense (binary/octet-stream)
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The more tightly packed the atoms are, the denser the object. This means the most dense picture would be B. |
| A baseball strikes the roof of a car and dents it. The paint on the roof begins to crack and chip, exposing the metal. The exposed metal on the roof rusts, eventually causing a small hole in the roof. Which event is NOT a physical change? a. the paint cracks and chips b. the exposed metal rusts c. the rook of the car dents d. the baseball strikes the roof | A physical change just changes physical properties like size and shape. A chemical change creates a NEW substance and can not be reversed. The only new substance formed is rust...this means the correct answer is b. |
| Heat will continue to transfer between two areas or objects until a. both areas/objects are the same temperature b. the melting point is reached c. all heat energy is lost to the air d. the colder object absorbs all of the heat energy | Heat will transfer until both areas/objects are the SAME temperature. |
| Which of the following is formed when two elements combine chemically? a. an electron b. a atom c. a compound d. a mixture | A compound A compound is formed when two or more elements form a chemical bond. |
| What is the smallest unit of a chemical compound that still has the properties of that compound? a. a nucleus b. a molecule c. an element d. an atom | A molecule AT LEAST 2 atoms (elements) bonded together. This is the smallest unit of a chemical compound. |
| A student is given a sample of an unknown liquid to test in the laboratory. The student thinks that the liquid is water. Which of the following physical properties of the sample is most helpful to determine if the liquid is water? a. the color of the liquid b. the mass of the liquid c. the volume of the liquid d. the boiling point of the liquid | Boiling Point Water boils at 212 degrees. Other liquids with the same, color, mass, and volume will boil at different temperatures. |
| In chemistry, the elements are a. Pure chemical substances containing only one type of atom b. Pure chemical substances containing two or more different types of atoms c. Substances which can be burnt in the presence of air d. Substances which do not react with other substances | An element is PURE and contains ONE type of atom. Example: The element gold is pure because it only contains gold atoms. |
| Which of the following do water (H2O), rust (Fe2O3), and salt (NaCl) have in common? a. Water, rust and salt are atoms. b. Water, rust and salt are mixtures. c. Water, rust and salt are elements. d. Water, rust and salt are compounds. | They are all compounds. A compound is formed when two or more elements bond together. |
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The table below shows the number of each kind of atom that makes up one molecule of the compounds sucrose and ethanol. Which of the following is the same for both compounds?
a. the mass of each molecule
b. the length of each molecule
c. the types of atoms in each molecule
d. the number of atoms in each molecule
Image:
Twelve (binary/octet-stream)
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The types of atoms in each molecule The table shows that both sucrose and ethanol contains carbon, oxygen, and hydrogen atoms. |
| The figure shows a toaster that toasts bread. Which energy conversion takes place when a toaster is switched on? a. chemical to sound a. chemical to sound c. chemical to thermal d. electrical to thermal | electrical to thermal Plugging in the toaster is electricity being used to make heat (thermal) |
| Which statement best describes the energy changes that occur while a child is riding on a sled down a steep, snow-covered hill? a. Kinetic energy decreases and potential energy increases. b. Kinetic energy increases and potential energy decreases. c. Both potential energy and kinetic energy decrease. d. Both potential energy and kinetic energy increase. | Kinetic increases and potential decreases Potential energy is highest at the top of the hill and decreases as you go down the hill Kinetic energy is lowest at the top of the hill and increases and you go down the hill. It is highest at the bottom of the hill. |
| At what point in its fall does the kinetic energy of a falling object equal its potential energy? a. at the start of the fall b. halfway between the start and the end c. at the end of the fall d. at all points during the fall | halfway between the start and the end Potential energy decreases during a fall and kinetic energy increases during a fall. This means they would be equal 1/2 way through the fall. |
| The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. At which position does the boulder have the greatest kinetic energy? | B Kinetic energy is greatest at the bottom of a fall. |
| David aims and shoots a basketball into the net. The dotted arrows in the diagram above show the path of the basketball. At which point is the kinetic energy the highest? | C Kinetic energy is greatest right before touching the ground. |
| David aims and shoots a basketball into the net. The dotted arrows in the diagram above show the path of the basketball. At which point is the potential energy the highest? | B Potential energy is greatest at the highest point. |
| Which of the following models correctly represents the compound phosphorus trichloride (PCl3)? | A In the compound PCl3, I have one P atom (dark grey atoms) and 3 Cl atoms (Light grey atoms). |
| The liquid in a thermometer rises when the temperature increases. This is because the particles in the liquid a. move faster and spread apart b. lose heat energy and condense c. move slower and spread apart d. lose heat energy and evaporate | As the temperature increases, particles SPEED UP and move FURTHER APART |
| The diagram shows two magnets. If the magnets are brought closer together, they will a. attract each other with a stronger force b. stay in the same position c. repel each other with a stronger force | In magnets, opposites attract. The picture shows the both magnets have the North Pole facing each other. Because they are both the same they will repel each other. |
| Which of the following sets of tools would be most useful in an experiment measuring the rate of transfer of thermal energy in four different liquids? a. Triple-beam balance, beakers, metric ruler b. Hot plate stove, beakers, thermometers c. Microscope, funnel, metric ruler d. pH meter, test tubes, forceps | Thermal means HEAT...this means you would use a hot plate, beaker, and thermometer |
| Which graph correctly shows the effect of heat energy on the motion of molecules of matter? | With heat...as temperature increases, motion increases...the only graph that shows motion increasing as temperature increases is C. |
| Given the diagrams X, Y, and Z below, Which diagram or diagrams represent compound? a. X only b. X and Y c. Y only d. X and Z | X only A compound must be composed of at least TWO DIFFERENT elements. |
| Use Newton’s second Law of Motion to calculate how much force would be necessary to move a 100 kg object at a speed of 2 m/s2. a. 50 N b. 200 N c. 102 N d. not enough information | F = m * A F = 100kg * 2 m/s2 So 200 N is the correct answer |
| The graph below shows distance and time for one of Anna’s swimming races. What is Anna’s average speed? a. 2 m/s b. 6 m/s c. 8 m/s d. 72 m/s | According to the graph, every second she is moving 2 m...so her speed is 2m/s |
| During which span of time was the beetle not moving? a. 0-4 minutes b. 4-6 minutes c. 6-14 minutes d. 14-16 minutes | The beetle was not moving from minute 6 to minute 14. |
| How many centimeters were traveled in the first 6 minutes? a. 6 cm b. 8 cm c. 4 cm d. 16 cm | According to the graph, the beetle moved 8 cm in the first 6 minutes |
| For an object to remain at rest, which of the following must be true? a. The forces on it are balanced. b. There is no friction. c. Gravity does not act on it. d. The object has no mass. | For an object to stay at rest, the forces on it must be balanced. |
| Read the following statements. Which one is NOT a great illustration of Newton’s 3rd Law of Motion? a. Firefighters hold hoses firmly because as the water shoots out, the hose is pushed back. b. A car speeding on the highway slows down when they see a police car. c. A cannon jumps back as it is fired by a soldier. d. When you sit in your chair, your body exerts a downward force on the chair and the chair exerts an upward force on your body | Newton's 3rd Law states that for every action (force) there is an EQUAL and OPPOSTITE reaction. The statement that does not apply to Newton's 3rd Law is... A car speeding on the highway slows down when they see a police car. |
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