ST 204 NAME: ______HR: ______DATE: ______

SEC 2 SCIENCE

Review Questions for January 2016 Exam

Answer all questions in a notebook or in a word document on your computer.

SCIENTIFIC METHOD

(Question, Hypothesis, Materials, Variables: Independent, Dependent, Constant, Control)

  1. How is a procedure written in a lab?
  2. Define the following variables: independent, dependent and constant.
  3. In the following experiment, name 3 controls, the independent variable and the dependent variable. What type of fabric is the most resistant to tearing?
  4. In the following experiment, name 3 controls, the independent variable and the dependent variable. At what temperature will water dissolve the most table salt in 1L of water?
  5. The materials of a lab are written in ______form and it includes the ______and ______of each item.

Data Tables

  1. Create a formal table with the following information: Liquid 1 (m=200 g, V=380 mL); Liquid 2 (m=8kg, V=7.5L); Liquid 3 (m=0.004 g, V=0.005 mL).

THE MATERIAL WORLD

Scientific Notation

  1. Write the following numbers in scientific notation.

a) 450000000000000 b) 0.000006677 c) 0.88885 d) 706 e) 4

  1. Convert the following scientific notation into regular notation.

a) 5.99 x 10-14 b) 2.209 x 104 c) 3.0 x 100 d) 6.3 x 10-7 e) 5.0 x 103

Metric Conversions

  1. Convert the following measurements:

a) 4.6m = ?hm b) 0.0007mg = ?kg c) 4.009 daL = ?cL d) 0.000003mm = ?km

Mass and Volume (p. 178-180)

What is mass and what are the units for mass?

What is volume and what are the units for volume?

How can you find the volume of a cube? a rock?

Measuring mass on a triple beam balance & volume in a graduated cylinder (p.457 & 459)

  1. Read the following masses:

a)

b)

  1. Draw a 50 mL graduated cylinder and draw 37 mL of liquid inside of it. Explain step by step how you would read that volume. Make sure to include the word meniscus in your explanation.

Lab Equipment (Inside front cover of textbook)

  1. Draw the follow pieces of lab equipment: a beaker, an Erlenmeyerflask, a test tube, a stand, universal clamp & ring, a round bottom flask, a dropper, a spatula, a funnel, a wash bottle, a test tube clamp, a beaker clamp & a mortar and pestle.

Lab Safety

  1. Why should you never directly smell a substance during a lab? Explain how to properly smell a substance in the lab.
  2. Why must you clear your lab space before starting a lab experiment?

Density(D=m/V V=m/D m=DV Vcylinder=πr2h)

  1. If a cylinder has a density of 13.4g/cm3, a diameter of 2.4cm and a height of 7 cm, then what is its mass?
  2. Give the mass (in kg) of a rock whose density is 5.6g/mL and has a volume of 0.06L.
  3. Your brother threw your favorite ball into the ocean. If it has a mass of 0.4kg and a volume of 0.445L, will it float? (Density of seawater is 1.029 g/mL)
  4. Find the density of a rock in g/L if Vf= 89mL, Vi = 55mL and m = 2.7kg.

Acids and Bases (p. 183-188)

  1. What taste do acids and bases have?
  2. Explain how acids and bases play a role in the digestive system. (Hint: in stomach & pancreas)
  3. Give an example of an acid and a base found in nature and explain how each is neutralized.
  4. Name 3 acidic substances and 3 basic substances found on Table 4 (p.184) and explained how they are used.
  5. Explain how each of the following are used: litmus paper, universal indicator paper and pH meter.
  6. Draw a pH scale and identify where strong acids, weak acids, neutral substances, weak bases and strong bases would be found.
  7. Complete the following statements:

a)Stomach acid is ______times more ______than battery acid.

b)A tomato is ______times more ______than baking soda.

c)An apple is ______times more ______than a lemon.

d)Milk is ______times more ______than rain.

Temperature and Atmospheric Pressure (p.182)

  1. At what temperature does water boil at 1600m above sea level?
  2. At what temperature does water boil at 0m (sea level)?
  3. Use the following words: atmospheric pressure & air particles in your answer to explain this difference.
  4. Therefore, the higher you go in altitude the ______more/less energy you need to boil water.

Transformation of Matter (p.191-201)

  1. Draw a triangle showing the changes of state of matter and identify all the changes. Use red & blue arrows to show changes involving heat or cold.
  2. Give a real life example for all 6 changes of state.
  3. Explain what is happening in all 5 sections of a heating curve. Include the concept of temperature, the movement of particles and the bonds/forces between the particles in your discussion.
  4. What are the 5 signs that a chemical change has occurred?
  5. Name and explain the law demonstrated by the equation below:

H2 + Cl2  2 HCl

1.01g 35.45 g 36.46g

  1. Explain the difference between a heterogeneous mixture and a homogeneous mixture.
  2. What is another word for homogeneous mixture and how is this different from a pure substance?
  3. Explain in your own words the following: solute, solvent, soluble and dissolution.
  4. What are pure substances? Give the 2 categories of pure substances.
  5. Define the following words: residue (in both methods), filtrate, condenser, and distillate.
  6. Explain the 4 methods of separation? Give an example of each.

Organization of Matter (p.203-210)

  1. Why are atoms like the letters of the alphabet?
  2. In a constellation drawing, explain the 5 points of the atomic theory.
  3. What is the relationship between an atom and an element?
  4. Who was responsible for the creation of the periodic table?
  5. What does the organization of the periodic table help scientist do?
  6. What is a period?
  7. What does a family or group represent on the periodic table?
  8. Which group on the periodic table rarely forms compounds?
  9. On the periodic table there are three main categories of elements. What are they?
  10. Give 2 examples of chemical symbols and explain it represents.
  11. What is the difference between a molecule and a compound?
  12. Are the following examples elements or compounds?

a) Saltb) MgCl2c) N2 d) Glucose e) Ca

THE LIVING WORLD

Cells (p.278-279)

  1. Draw an animal cell and a plant cell, label the organelles and give the function of each organelle.
  2. Why don’t potato cells have chloroplasts?
  3. Which cell organelle is gelatinous and always in movement?
  4. What green pigment is found in plant cells? In which organelle?
  5. What is photosynthesis?
  6. Plants are not mobile like animals. Name the 2 organellesonly found in plant cells and state their function.

Light Microscope (p.453-454)

  1. Create a formal table with the parts of a microscope and each of their functions.
  2. How do you properly carry a microscope?
  3. What is lens paper used for?
  1. Complete the following table:

Objective Lenses / Objective Magnification / Ocular lens / Total Magnification
Low / 10x / 500x
Medium / 1200x
High / 150x
  1. Why should you begin looking at a specimen at the lowest magnification?
  2. Why should a specimen be centered?
  3. How does the condenser affect how you see the specimen?
  4. What is the purpose of staining a specimen and of using a cover slip?
  5. Label all parts of the microscope below:

YOU DID IT! WOOHOO!

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