Science 7

Seating Plan 701

Seating Plan 702

From last class… Did you…? Finish the hypothesis writing activity on looseleaf? Put a name on it? Put it in the pass in bin?

Review from Last Class What are the 3 types of variables? What is an independent variable? What is a dependent variable? What is a controlled variable?

Hypothesis It is usually written in the form: If__________ then ________ will happen because___________________________. Based on our observations, inferences and background knowledge we can make a TESTABLE hypothesis

Hypothesis Writing From your observations and inferences determine: which part you can control and manipulate (Independent Variable) Which part we can’t control but what may change based on our other manipulations. What do we want to measure? (dependent variable) It also doesn’t hurt to identify other variables that may have an effect, but that you would attempt to keep the same in an experiment (controlled variables)

Hypothesis Writing From what you’ve identified you can write your hypothesis in the: “If_____ then_____ because _______” format. If independent variable, then dependent variable, because _________________.

Practice: Writing a Hypothesis Hypotheses _________________ Observations Salt in soil may affect plant growth. Temperature may cause leaves to change color. Sunlight causes fruit to ripen more quickly. Bacterial growth is affected by temperature Ultraviolet light may cause skin cancer.

Practice: Writing a Hypothesis Hypotheses If salt in soil affects plant growth, then plants grown in higher salt content soil will grow slower than low salt content soil. If temperature causes leaves to change color, then plants exposed to cooler temperatures (less than 15°C) should change color faster than plants exposed to warmer temperatures (above 15°C) If sunlight causes fruit to ripen more quickly, then fruit kept in the dark should ripen slower than fruit kept in direct sunlight. If bacterial growth is affected by temperature, than food kept at a lower temperature (below 4°C) should have less bacterial growth than food kept at room temperature. (above 4°C) If ultraviolet light causes skin cancer, then rates of skin cancer occurrence will be higher in people exposed to higher amounts of UV light (ie: tanning bed users, not using sunscreen). Observations Salt in soil may affect plant growth. Temperature may cause leaves to change color. Sunlight causes fruit to ripen more quickly. Bacterial growth is affected by temperature. Ultraviolet light may cause skin cancer.

Canopy in the Clouds You will receive a chromebook Login to your GNSPES account and classroom go to the link provided and follow the instructions on the page