8.3 Investigating acids and alkalis

Hypothesis

A hypothesis is a suggested solution to a problem
Written as an "If... then... " statement

Example: If the amount of water given a plant is increased, them the plant will increase in height

Multiple Choice

"Plants will grow taller if they receive more sunlight."

Can this hypothesis be tested?

• Not sure
• Yes
• Maybe
• No

Multiple Choice

"Wearing a lucky charm will make all wishes come true."

Can this hypothesis be tested?

• Not sure
• Yes
• Maybe
• No

Multiple Choice

"Students who study for longer hours will get better grades in their exams."

Can this hypothesis be tested?

• Not sure
• Yes
• Maybe
• No

Multiple Choice

"Doubling the amount of flour in a pancake recipe will make the pancakes thicker."

Can this hypothesis be tested?

• Not sure
• Yes
• Maybe
• No

Multiple Choice

"Chocolate ice cream is the best flavor."

Can this hypothesis be tested?

• Not sure
• Yes
• Maybe
• No

Multiple Choice

"The best movie of all time is Black Panther: Wakanda Forever .'"

Can this hypothesis be tested?

• Not sure
• Yes
• Maybe
• No

Multiple Choice

Which is a valid hypothesis for this example: Ahleayah wants to investigate if the amount of fertilizer used on a field will affect the number of earthworms found there.

• If there are earthworms, then there will be fertilizer.

• If the amount of fertilizer is increased, then the number of earthworms will decrease

• Can earthworms live in fertilized fields?

• Fertilizer kills earthworms

Multiple Choice

What is a valid hypothesis for this example: Dante wants to investigate if the amount of oxygen in the water will have an effect on the oyster population.

• If the amount of oxygen in the water is decreased, then the number of oysters will decrease.

• Can oysters breathe oxygen in the water?

• Oysters will turn blue when exposed to oxygen.

• If there are oysters in the water, then there will be less oxygen.

Variables

Multiple Choice

What was the independent variable?

• age of students

• jigsaw puzzle

• time to finish

Multiple Choice

What was the dependent variable?

• age of students

• jigsaw puzzle

• time to finish

Multiple Choice

What was the dependent variable?

• temperature of water

• amount of eggs

• time to cook

• amount of water

• type of pan

Multiple Choice

What was the independent variable?

• temperature of water

• amount of eggs

• time to cook

• amount of water

• type of pan

Multiple Choice

Mr. S set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. What is the controlled variable?

• Distance traveled by the ball
• Height of the ramp
• Mass of the ball

Multiple Choice

Mr. S set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the independent variable.

• Distance traveled by the ball
• Height of the ramp
• Mass of the ball

Multiple Choice

Mr. S set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. What is the dependent variable?

• Distance traveled by the ball
• Height of the ramp
• Mass of the ball

Multiple Choice

Lauren is convinced that book/movie combinations are better if you have read the book before watching the movie. Lauren's friend, Alyssa, thinks that movies are just as good even if you don't read the book. They got 40 of their classmates to help them solve their debate. 20 classmates read the book Divergent and 20 more classmates viewed the movie without reading the book. All participants went to see the movie on Friday at 6 p.m. They had their classmates do a survey (1-4 stars). Then, Alyssa and Lauren averaged the number of stars for both groups.
What is the dependent variable?

• The length of the movie
• The time the movie starts
• The # of stars the movie gets

Multiple Choice

Lauren is convinced that book/movie combinations are better if you have read the book before watching the movie. Lauren's friend, Alyssa, thinks that movies are just as good even if you don't read the book. They got 40 of their classmates to help them solve their debate. 20 classmates read the book Divergent and 20 more classmates viewed the movie without reading the book. All participants went to see the movie on Friday at 6 p.m. They had their classmates do a survey (1-4 stars). Then, Alyssa and Lauren averaged the number of stars for both groups.
What is the independent variable?

• Watching the movie
• Reading the book
• Taking the survey

Multiple Choice

A student is planning an experiment to find out how the height from which he drops a ball affects how high the ball bounces. What is the control variable?

• The ball used
• The height the ball bounces
• Height of the ball being dropped

Multiple Choice

A student is planning an experiment to find out how the height from which he drops a ball affects how high the ball bounces. The dependent variable is the _____.

• Diameter of the ball
• Force acting on the ball
• Height that the ball bounces
• Height from which the ball is dropped

Multiple Choice

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, what is the dependent variable?

• Type of plant
• Water, apple juice, milk
• Plant growth

Multiple Choice

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, what are the controlled variables?

• Type of plant, amount of music, and sunlight
• Water, apple juice, milk
• Plant growth

Multiple Choice

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

• The type of plant
• The amount of sunlight
• The type of music
• The type of liquid

Poll

I can understand the idea of hypothesis

• 100

• 80

• 60

• 40

• 20

Poll

I can understand the idea of variables

• 100

• 80

• 60

• 40

• 20

Poll

I can understand the idea on how to investigate using hypothesis and variables

• 100

• 80

• 60

• 40

• 20