Density/Volume
Which object has the greatest density?
A. Object A
B. Object B
C. Object C
D. Object D
c. object c
When lighting a gas grill, you need a spark of energy to get the grill going. Then the grill releases an abundance of heat and light. Which one of these best describes the transfer of heat?
A. This reaction is endothermic because it requires energy to occur.
B. This reaction is exothermic because it releases heat.
C. This reaction is exothermic because it releases more energy than it absorbs.
D. This reaction is endothermic because energy enters the system.
c. This reaction is exothermic because it releases more energy than it absorbs.
Which of the following scientific facts would be most useful to know when trying to separate a solution of rubbing alcohol and water.
A. Rubbing alcohol has a boiling point of 78.3 degrees Celsius.
B. Rubbing alcohol smells pungent compared to water.
C. Rubbing alcohol and water are both clear colored liquids.
D. Rubbing alcohol runs easily through particulate filters.
A. Rubbing alcohol has a boiling point of 78.3 degree Celsius.
Which of the following combinations is a mixture rather than a compound?
A. oxygen and nitrogen in air
B. sodium and chlorine in salt
C. hydrogen and oxygen in water
D. nitrogen and hydrogen in ammonia
A. oxygen and nitrogen in air
Regular soda cans sink to the bottom of the container, but diet soda floats. Which of the following statements best explains this observation?
A. The can of regular soda is less dense than the can of diet soda.
B. The can of regular soda is more dense than the can of diet soda.
C. The can of regular soda has a larger volume than the can of diet soda.
D. The can of regular soda has a smaller volume than the can of diet soda.
B. The can of regular soda is more dense than the can of diet soda.
When a snowman melts, is it an endothermic or exothermic reaction and why?
Endothermic reaction because it is absorbing heat energy from the environment.
What is the difference between mass and weight?
Mass is the amount of matter in an object, how much space it takes up.
Weight is the measure of the force of gravity on an object.
ex: When people go to the moon, their weight changes because there is less gravity but their mass will be the same.
How would you separate sand and salt from water?
Filter the sand out and then evaporate the water so the salt is left.
A glass is partially filled with water. Five ice cubes are placed in the glass, causing the level of the water to reach the rim of the glass. Which of the following statements best explains the change in water level?
A. The volume of the submerged ice is equal to the volume of water displaced.
B. The mass of the water in the glass is less than the mass of the ice.
C. The weight of the ice is less than the weight of the water in the glass.
D. The density of the water in the glass is greater than the density of the ice.
A. The volume of the submerged ice is equal to the volume of water displaced.
Are camp fires endothermic or exothermic reactions, why?
Camp fires are exothermic because they release heat and light energy into the environment.
Which of the following units best represents the density of an object?
A. kg
B. hr
C. m/s2
D. g/cm3
D. g/cm3
Which of the following is an example of a container that is filled with a pure substance rather than with a mixture?
A. a tire filled with air
B. a jar filled with salt water
C. a balloon filled with helium
D. a glass filled with chocolate milk
C. Balloon with helium
Two different bars of soap are being investigated by a group of students. They measured the mass and volume of each bar and recorded the results in the table below.
Soap A: Mass (g) =110 Volume (cm3) =100
Soap B: Mass (g) =95 Volume (cm3) =100Density of water = 1.0 g/cm³
A. 1.1 g/cm3; 0.95 g/cm3
B. 1.1 cm3/g; 0.95 cm3/g
C. 0.90 g/cm3; 1.05 g/cm3
D. 0.90 cm3/g; 1.05 cm3/g
a. 1.1 g/cm3; 0.95 g/cm3
Is frying an egg in a frying pan an endothermic or exothermic reaction, why?
Frying an egg is an endothermic reaction because it is taking in heat energy as it cooks.
Propose a method for separating a bronze alloy into its component metals of tin and copper.
Heat the bronze alloy to the boiling point of tin. The tin will melt and you will be left with the copper.
Sulfur (S), oxygen (O2), water (H2O), and sodium chloride (NaCl) are all examples of pure substances. Which of the following describes all pure substances?
A. A pure substance consists of only one type of element.
B. A pure substance has a definite chemical composition.
C. A pure substance can be broken down into simpler substances by physical means.
D. A pure substance is normally found as a solid at room temperature.
B. A pure substance has a definite chemical composition.
What is Volume?
the amount of space that a substance or object occupies, or that is enclosed within a container.
True or False:
Freeing water in an ice cube tray is an example of an Exothermic Reaction.
True
A cold can of juice is removed from the refrigerator and is placed outdoors on a warm day. After several minutes, moisture appears on the outside of the cold can. Which of the following statements best explains why the moisture appears?
A. The warm air absorbs cold from the can and changes to a liquid.
B. Water vapor in the air condenses into a liquid on the cold can.
C. The warm air causes heat to flow out of the can and condense in the air.
D. Water vapor in the air absorbs heat from the can and changes to a liquid.
B. Water vapor in the air condenses into a liquid on the cold can.
Which of the following is an element? :
A. Oxygen
B. Water
C. SaltD. Sunlight
A. Oxygen