Independent/Dependent
Variable
Variable
A scientist studies the impact of withholding affection on the appetite of rats
Independent variable: Affection
Dependent variable: Rat Appetite
Control variable: type and amount of food
WHMIS stands for
What is Workplace Hazardous Materials Information System
You blow dry your wet hair. Physical change or Chemical change
what is a physical change
Suger is a compound or element
An Inference is
What is an explanation based on past experience or prior knowledge
A scientist tests how many days a person can eat Big Macs before getting sick
Independent variable: Number of days eating Big Macs
Dependent variable: Onset of sickness
Control variable: The amount of Big Macs consumed each day
MSDS stands for
What is Materials Saftey Data Sheet
The difference between a physical change and a physical property
physical property describes what something is, while physical change shows how it can change without becoming something new
Carbon dioxide is an element or compound
what is an compound
Control Variable is
What is the variable that always stays the same
Students of different ages were given the same puzzle to complete. The time of puzzle assembly was monitored
Dependent variable: Puzzle assembly time
Independent variable: Age
Control variable: difficulty level of the puzzle
The information system implemented in
what is 1988
You take out your best silver spoons and notice that they are very dull and have some black spots. Physical change or Chemical change
what is a chemical change
is chocolate is a heterogeneous or a homogeneous mixture
what is a homogeneous mixture
Science is what 2 things
What is the process of inquiry and accumulated body of knowledge
The amount of pollution produced by cars was measured for vehicles using gasoline containing different amounts of lead
Dependent variable: Pollution produced by cars
Independent variable: Amount of lead in the gasoline
control variable: type of vehicle used
WHMIS gives workers and employers key safety and handling in the form of
Labels, symbols, and MSDS
The difference between a chemical change and a chemical property is
chemical property describes the ability to change into something new, while a chemical change is when that change happens
The definition of a heterogeneous mixture is
what is a mixture of two or more substances that are not uniform in composition
The Steps of the Scientific Method
What is Observation, Question, Research, Hypothesis, Design Experiment, Conduct Experiment, Collect Data, Conclusion, Communicate Results
In a study investigating how varying light intensity affects the rate of photosynthesis in algae, researchers expose algae to different light intensities and measure oxygen production over time.
Independent Variable: Light intensity
Dependent Variable: Oxygen production
Control variable: Type of algae
WHMIS Labels includes
Name of the Chemical, Hazard Symbol, Risks, and Precautions, First Aid Instructions, Supplier's name and address, A reference to the matching MSDS
A sample of sodium chloride is heated in a strong electric field and undergoes electrolysis, producing sodium metal and chlorine gas. The sodium metal is then exposed to water, causing a violent reaction that produces sodium hydroxide and hydrogen gas. Identify whether this is a chemical change or a physical change
What is a chemical change
A homogeneous mixture is
what is a mixture that has been mixed together so well that the different parts will not settle out on their own
The laws of science are
What is observed so many times without fail, scientists are convinced they will always happen