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Mike and his dad made a campfire. The wood BURNING in the fire is an example of
A. A change of state
B. A physical Change
C. A chemical change
D. A change of Mass
What is the SMALLEST Particle of the Element gold ( Au) that can still be classified as gold?
A. Atom
B. Molecule
C. Neutron
D. Proton
Which of the following is an example of an endothermic process?
A. Popsicles Freezing
B. Soup Cooling
C. Water boiling
D. Steam Condensing
You froze 50g of water. Which of the following DID NOT change when the water became ice?
A. The temperature
B.The Density
C. The Mass
D. The State
A family and consumer science class is studying properties changes that occur in foods. The Teacher bakes a large batch of brownies. Baking brownies is an example of what.
A. Physical Change
B. Chemical Change
C. A physical Change
D. A chemical property
Knowing the Desnisty of water is 1g/cm^3, Which type of wood would be best to construct a toy that FLOATS?
A. Oak Wood= 0.85 g/cm^6
B. Ebony Wood=1.20 g/cm^3
C. Satinwood= 1.03g/cm^3
D. Coral Wood= 1.10g/cm^3
In a Laboratory Experiment that measures heat energy changes in a chemical reaction, what is the most essential piece of equipment?
A. Triple Bean Balance
B. Calculator
C. Hot Plate
D. Thermometer
All of the following are examples of exothermic processes EXCEPT
A. Burning a piece of wood
B. Explodin a firecracker
C. Freezing water into ice at 0-degree celsius
D. Heating up water by 10-degree celsius
Which of the following describes a compound?
A. It can be broken down by physical means
B. It can be easily separated like a mixture
C. Compounds are made from elements
D. Compounds occur naturally on the Earth
Which of the following is an example of a PHYSICAL change?
A A log gives off heat and light as it burns
B. A Tree stores energy from the Sun in its Fruits
C. A penny lost in the grass slowly changes color
D. A water pipe freezes and cracks on a cold night
Oxidation, reacting to acids, reacting to bases are ALL Examples of
A. Chemical Change
B. Physical Change
C. Chemical Properties
D. Physical Properties
If you mix 10 mL of vinegar and 20g of baking soda, which of the following DOES NOT occur during this chemical change?
A= Carbon Dioxide Gas is produced
B= Bubbling and frizzing are seen
C= The mass is decreased to 10g
D= A new susbtances is formed
Which of the following represents a chemical change?
A. Dissolving Sugar in Water
B. Iron combines with oxygen
C. Dew disappears into the air
D. Chopping wood into pieces
Some students were studying the properties of water. One student placed a cup containing 80mL of water in a freezer. Another student placed an identical cup containing 40mL of water in different freezer. Which of the following will be the SAME for both cups of water?
A. The temperature at which the water freezes
B. The mass of the frozen water
C. The time it takes the water to freeze
D. The volume of the frozen water
What is the best explanation of why salt is spread on Roads durning frigid winter days when rain or snow is predicted?
A. The salt gives traction to the car tires
B. The Salt absorbs the coldness from water on the road
C. The salt lowers the freezing point of water on the road
D. The Salt causes road ice to melt at a high temperature.
Based on the law of conservation of mass, which of these is TRUE statement about chemical changes?
A. The mass of the products is always greater than the mass of the materials
B. The mass of the products is always less than the mass of the material
C. The mass of the products is neither less or greater than the mass of the materials
D. The mass of the products can be either less or greater than the mass of the materials.
Which statement correctly describes heat energy flow?
A. As objects cool, energy is absorbed by the object.
B. If a hot object touches a cold object, heat flows from the hot object to the cold object.
C. As heat energy is lost by an object, the temperature of the object increases.
D. Heat energy flows from the colder object to the warmer object.
Sally had a cooler filled with various food items. Ketchup, mayonnasie, and tarter sause.When she opened the cooler, the ice had melted and the packets of mayonnaise had the sunk to the bottom of the cooler. All of the packets were of Equal size and each contained 3mL What can you infer?
A. The mayonnaise was the densest
B. The mayonnaise was the least dense
C. The ketchup and the tarter sause had the same density
D. The ketchup and the mayonnasie had the same density.
Which statement best describes an exothermic chemical reaction in a solution?
A. Heat energy is released during is required for the reaction
B. Heart Energy is required for the reaction to occur
C. The reaction vessel will begin to feel cold
D. The temperature of the reacting solution will remain constant.
If you place the following items in water: sand, salt, a cork, and a small palastic shpere, some of the items will FLOAT because they are
A. Filled with more gas molecules
B. More dense than water
C. Filled with tiny particles
D. Less ense than water
Johnny was investigating changes in the matter by testing interactions with different materials. Which process will result in a product with new CHEMICAL properties
A. Cutting a piece of cardboard
B. Breaking a rock
C. Baking cookies
D. Mixing sugar water
You place a tea bag into a cup of hot water. You notice a color change and little specks floating in the water from a tear in the tea bag. Which of the following MOST LIKELY explain what occurred?
A. The tea is not completely soluble in the water
B. The water viscosity was too high to dissolve the tea.
C. The water was not hot enough to dissolve the tea
D. The tea chemically reacted with the hot water.
Brenda is experimenting with different white powders with similar physical properties. She is testing flour, baking soda, and baby powder. Which of these test would BEST help her prove which is baking soda?
A. Looking at the color
B. Mixing it with water
C. Looking at the texture
D. Mixing it with vinegar
The following are Observations made by a student performing a Lab
Helium- Less Dense Than Air, No Odor
Iron- Attracted to a Magnet
Oxygen No Odor, Is a gas at room temperature
Sodium Chloride- Dissolves in water, has a grainy texture
Based on Observations, WHat is the BEST title for the chart above?
A. Chemical Change of Substances
B. physical change of substances
C. Chemical properties of substances
D. Physical properties of Substances
A piece of lead at a temperature of 100 celsius is dropped into the water at room temperature about 22 celsius. Which statement correctly describes the energy change between the lead and water during this process.
A. The lead releases heat to the water
B. As the heat transfer causes the temperature of the lead to increases.
C. The heat exchange causes the temperature of the kead to increases
D.There is no transfer of heat between the lead and water