Scientific Method Review- Writing Hypotheses and Conclusions

Students were given the following prompt:

Predict the amount of water drops that you can fit on a penny. Then, write an if/then hypothesis about how you think adding the water droplets quickly will affect your prediction.

Which of these is the BEST hypothesis?

• If we drop water on a penny, then the water will expand, creating tension, so more water will be able to be dropped on the penny

• If water drops get added on quicker, then there will be less drops able to fit in the coin

• If we add the water droplets quickly, then it will overflow faster

• If you add drops quickly, then it will take less water

• If water droplets are added quickly to a penny, then the water will overflow more quicky due to the increased amount of force put on the water

Justify your previous answer. Explain how you chose the best hypothesis.

Tags

NGSS.HS-LS2-6

NGSS.HS-LS3-2

NGSS.HS-LS4-4

Which of these responses FULLY answer the following question:

What is the difference between polar and non polar compounds?

• Polar doesn't share electrons equally

• A polar compound is a covalent compound that does not share electrons equally. Whereas, non-polar compoinds are covalent compounds that do share electrons equally

• Polar: do not share electrons equally

  Non-polar: share electrons equally

• Polar compounds don't share electrons, and non-polar do.

Tags

NGSS.HS-PS1-1

Justify why you chose your previous answer. What about that response do you think made it more effective?

Tags

NGSS.MS-PS3-5

Which of the following conclusions is the most scientific?

The prompt was: Were either of your hypotheses supported or disproven?

• 1. 1. I reject my hypothesis because more water ended up fitting onto the penny, possibly because the water droplets ended up being smaller when the droplets came out of the pipette

  2. 2. I accept my hypothesis because less water fit onto the penny because the soap decreased the adhesion of the water, which decreased the surface tension of the water and allowed for less water droplets to fit on the penny

• My hypotheses were supported because the averages of the number of drops was similar to my hypothesis

• My hypotheses were both supported becuase the soap affects the number of drops the penny holds. Since it held less drops on average compared to the quick/slow water droplets due to data. Plain water was able to hold more becuase the water is able to stretch and expand itself compared to soapy water.

• My first hypothesis was supported by my data. I though that if water was added quickly, then the amount of drops a penny could hold would go down, and that was proven in my data.

  However, my second hypothesis was disproven by my data. I thought that if soap was added to water, more drops would fit, but that was disproven in my data

An average drop of water is 0.05 grams. Assume all of the water drops in this lab were average. The molar mass of water is 18.015 g/mole

If you were able to drop 51 drops of water on a penny, how many grams of water did you fit? (round to the hundredth place)

Mathematical Equivalence

ON

An average drop of water is 0.05 grams. Assume all of the water drops in this lab were average. The molar mass of water is 18.015 g/mole

(You were able to fit 51 drops on the penny)

Using your answer from the previous response, calculate how many moles were on your penny. Again, round to the hundredth place.

Remember- there are 18.015 g in ONE mole.

Mathematical Equivalence

ON

Tags

NGSS.HS-PS1-7