MTTC Integrated Science Secondary (94) 618 Questions with Correct Answers 100% Verified What are the 5 steps in the Scientific Method? - Correct Answers 1. Identify a problem or pose a question based on an observation.
- Formulate a hypotheses.
- Conduct experiments or tests the hypotheses.
- Observe and record the results.
- Draw a conclusion (was the hypothesis correct?).
- peer review is also important.
Metric Unit deca (da): - Correct Answers x 10^1
Metric Unit hecto (h): - Correct Answers x 10^2
Metric Unit kilo (k): - Correct Answers x 10^3
Metric Unit mega (M): - Correct Answers x 10^6
Metric Unit giga (G): - Correct Answers x 10^9
Metric Unit deci (d): - Correct Answers x 10^-1
Metric Unit centi (c): - Correct Answers x 10^-2
Metric Unit milli (m): - Correct Answers x 10^-3
Metric Unit micro (µ): - Correct Answers x 10^-6
Metric Unit nano (n): - Correct Answers x 10^-9 1 / 4
Metric Unit pico (p) - Correct Answers x 10^-12 What is an Independent Variable and what axis is it plotted on in a graph? - Correct Answers *The variable that acts as a control or does not change during an experiment.*x axis What is an Dependent Variable and what axis is it plotted on in a graph? - Correct Answers *The variable that changes in response to the independent variable. This change is measured to determine the effect of the independent variable on the dependent variable.*y axis What are random experimental errors? - Correct Answers Errors that are not consistent across the data set.
- can result in collected data that does not seem to fit and may be wildly different from the rest of
- may be the result of outside factors that are not considered variables
the data, or they may result in data that is indistinguishable from the rest.
*referred to as noise What are systematic experimental errors? - Correct Answers An error that will show up consistently across a sample or data set.*may be the result of a flaw in the experiment design or instrumentation *affects the average *known as a bias
Chemistry lab fire hazards - Correct Answers Volatile solvents:
ether, acetone, benzene *store in open beaker or Erlenmeyer flask *use extreme caution around sparks
- heat in fume hood with a steam bath (not on a hot plate)
Chemistry lab chemical burns - Correct Answers Mineral acids and alkalis are corrosive to the skin and eyes *acid halides and phenols are corrosive and often toxic 2 / 4
Chemistry lab toxic chemicals that can be absorbed through the skin - Correct Answers dimethyl sulfoxide (DMSO) nitrobenzene Chemistry lab toxic fume inhalation - Correct Answers acetyl chloride- severely irritate membranes in the eyes, nose, throat, and lungs benzyl chloride- eye irritation and tears Simple microscope - Correct Answers a microscope that contains only one lens Compound microscope - Correct Answers Microscope that contains two or more lenses to increase total magnification (usually 3 lenses) *multiply each magnification to obtain total magnification Accuracy of balances - Correct Answers Most accurate- Electronic triple- beam Least- Spring balance Chromotography - Correct Answers Is the separation of a mobile phase carrying a mixture that moves in contact with a selectively absorbent stationary phase.Analyte - Correct Answers The substance or chemical being analyzed or detected in a specimen reagent - Correct Answers a chemical agent for use in chemical reactions centrifuge - Correct Answers an apparatus that uses centrifugal force to separate particles from a suspension Heterogeneous mixture - Correct Answers A mixture in which different materials can be distinguished easily 3 / 4
precipitate - Correct Answers A solid that forms and settles out of a liquid mixture supernatant - Correct Answers liquid above the precipitate that remains after centrifugation that can be removed from the precipitate with a pipet- also called centrifugate Spectrophotometry - Correct Answers An analytical method for identifying a substance by its selective absorption of different wavelengths of light.Electrophoresis - Correct Answers A technique for separating macromolecules (proteins, RNA, DNA) on a gel using an electric field.Calorimetry - Correct Answers The measurement of heat flow (into or out of a system) as the result of a chemical reaction or physical process.Titration - Correct Answers a measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete Charles Robert Darwin - Correct Answers Author of "On the Origin of Species" and founder of modern evolution theory. Natural Selection, natural change, gradual change, and common descent *d.1882 Anton van Leeuwnhoek - Correct Answers made his own lenses found unicellular organisms cell theory (all cells come from preexisting cells) *d. 1723 Carl Linnaeus - Correct Answers "Father of Taxonomy"; established his classification of living things; famous for animal naming system of binomial nomenclature *d. 1778 Barbara McClintock - Correct Answers Nobel Prize winner who found that genes could jump from one place on chromosome to another Created the first genetic map for maize *d. 1992
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