Column 1
Complete the following statement:
Chewing food to break it down into smaller particles represents a _________ change, but the changing of starch into sugars by enzymes in the digestive system represents a ___________change
Physical
Chemical
List 4 characteristic properties
Boiling Point Solubility
Melting Point Toxicity
Density Corrosiveness
Flammability
Angelo decided for his science fair project that he wants to see how different liquids react with baking soda. The data he captured is below:
- Mixture 1 -> Baking Soda & Lemon Juice: Bubble/Fizzle
- Mixture 2 -> Baking Soda & Water: Baking soda dissolves
- Mixture 3 ->Baking Soda & Vinegar: Bubble/Fizzle
Which mixture under went a chemical change? Which mixture under went a physical change?
Chemical change: 1 & 3
Physical change: 2
What does it mean when characteristic properties of the substance before the reaction occurred are different after the reaction occurred.
Boiling point: 54oC -> Reaction -> Boiling point: 54oC
No new substance was formed
Physical Change
Two substances are mixed in four beakers, and a thermometer is placed in each beaker. The thermometers are checked every minute for five minutes, and the temperature is recorded in the table
**Google Slide**
Which beaker shows the greatest temperature change over five minutes?
Beaker C
What is the formula for Density?
Density = Mass / Volume
Define: Dependent Variable
A variable in which the scientist changes
What object is similar to Object X?
**Google Slide**
Object 4
Taylor stirs 2 grams of salt into a cup of water. He then tries to get the salt back by evaporating the water. In this experiment, the mass of salt recovered would be the same as the initial mass because
The salt does not evaporate with the water.
(Law of Conservation of Mass)
An experiment was preformed to test the effects of different types of fertilizers on the number of tomatoes produced by one type of tomato plant. What is the independent variable in this investigation?
Number of tomatoes
Define: Characteristic Property
A property of a substance that does not change no matter how much or how little of the substance you have
The phase change from water vapor to liquid water is known as...
Condensation
What technique would we use to measure the volume of an irregular shaped object
Water displacement
Jeremy conducted an experiment that compared the effects of different sounds on the growth of bean plants. He planted bean seeds of the same type and size in three containers using the same type of soil in each container. He placed the containers in the locations shown in the Google Slide.
Jeremy gave each plant the same amount of water at the same time each day. After two weeks, Jeremy observed that the plant in the living room was the largest and had the most leaves. Jeremy concluded that bean plants grow the fastest when exposed to television sounds. What is a mistake that Jeremy made in his experimental design?
Different locations
Different sound volume
Different amounts of sunlight
What does it mean when characteristic properties of the substance before the reaction occurred are different after the reaction occurred.
Melting point: 54oC -> Reaction -> Melting point: 57oC
New substance was formed
Chemical Change
A person's weight is influenced by the environment or by their genetics?
Their genetics
An irregular shaped rock was placed in 250 mL of water in a graduated cylinder. Once the rock was placed in the water the graduated cylinder then had a reading of 318 mL.
What is the volume of the rock?
68 mL
Is the combination of hydrogen and oxygen to form water a chemical change or a physical change?
Chemical Change
If the density of 10 mL of milk is 1.02 g/mL, what is the density of 50 mL of milk?
1.02 g/mL
Two DIFFERENT seeds are planted in the same amount of soil, light, same type of pot, and receive the same amount of water. This experiment is probably testing the impact of ...
Plant genetics