Think Like a Scientist
A ______ must be testable, meaning that a scientist can design and carry out an experiment in order to prove or disprove it.
Hypothesis.
What is the difference between mass and weight?
Mass is the amount of matter in an object and weight is impacted by gravity.
What is a satellite?
An object that orbits around another: ex: the moon
What is chlorophyll?
A green pigment found within plant cells that allows them to absorb light energy for photosynthesis.
what are the 3 particles that make up the atom? what are their charges
proton: positive
neutron: neutral
electron: negative
What is a constant/ control? Why are they important for scientific investigations?
They are the variables in an experiment that remain the same in order to make connections between other variables.
Calculate the density of mercury if there is 100 grams of mercury in a volume of 2 mL
50 g/mL
If Earth began to rotate on its axis at a faster rate, what effect would this have on the length of a day and the length of a year?
day: shorter
year: same length
Plants carry out the process of _________ by absorbing solar energy and creating chemical energy while animals carry out ______ by consuming chemical energy to produce ATP for cell functions.
Photosynthesis ; Cellular Respiration.
What does the law of conservation of mass state? Give me an example?
Mass cannot be created or destroyed. Burning a piece of paper. Same mass, different form.
Independent ; Dependent
Compare the difference between a physical and chemical change and give an example of each.
Physical: no change in identity (ice melting)
Chemical: changes identity ( burning log)
What phase of the moon comes immediately before a full moon?
Waxing gibbous
What gas is exhaled from animals and consumed by plants for the process of photosynthesis?
carbon dioxide
What is the difference between an autotroph and a heterotroph?
autotrophs make their own food and a heterotroph must consume other things to gain energy.
Ms. Sherman is doing an experiment on her 8th grade students. She is giving them each a different amount of review time to prepare for their pop quiz! She gave one group 5 minutes, another group 10 minutes and the last group 15 minutes. She then compared their scores on the pop quiz. Identify the independent and dependent variables in this experiment.
IV: review time
DV: quiz score
The reactants of a chemical reaction are shown :
Na2O + H2O --> ?
How many atoms of Oxygen, Sodium and Hydrogen must be present in the products?
Oxygen: 2
Sodium: 2
Hydrogen: 2
Tides are caused by the gravitational pull of the sun and moon on Earth's oceans. What is a spring tide, and which phases of moon cause them?
Spring tide is a higher than normal tide caused by the alignment of the sun, moon, and earth during a full or new moon.
Which organelle does cellular respiration occur in? How about photosynthesis?
Photo: chloroplast
Cellular respiration: mitochondria
Compare the shape, volume, and particle arrangement for solids liquids, and gases.
Solid: definite shape and volume and densely packed particles
Liquid: no definite shape, definite volume, closely packed particles.
Gas: no definite shape or volume and far apart particles
State the scientific method in order without any mistakes!
1.) Make an observation. 2.) Ask a Question. 3.) Perform background research. 4.) Form a hypothesis 5.) Design and carry out experiment 6.) Analyze data / form conclusion. 7.) Publish your results.
Glucose is commonly formed by plants and commonly consumed by humans and other animals. Glucose has the chemical formula: C6H12O6. Given that carbon weighs 12 AMU, Hydrogen weighs 1 AMU and Oxygen weighs 16 AMU what is the weight of glucose.
180 AMU
List the inner and outer planets in order and provide two differences between them
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Inner are rocky and much smaller. Outer are gaseous and much larger
What is the relationship between the reactants and products of photosyntheis and the reactants and products of cellular respiration. List all reactants and products for each.
Photo: carbon dioxide + water --> oxygen and glucose
cellular resp: oxygen and glucose --> water and carbon dioxide
Rio De Janeiro is a beautiful city in Brazil. I wish to take a trip there this December. What kind of clothes should I pack knowing how the earths tilt affects seasons on Earth.
I should pack summer clothes because it is summer time in Rio when it is winter time in the northern hemisphere