You Be the Chemist - State Competition Practice Test

You Be the Chemist - State Competition Practice Test

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You Be The Chemist - State Competition Practice Test

Q 1. Which of the following is true:

  1. An atom does not gain or lose any electrons when it chemically combines with another element
  2. Nonmetal atoms tend to lose electrons
  3. When the outermost energy level of an atom contains eight valence electrons, the atom is very unstable.
  4. A neutral atom that loses electrons acquires a positive oxidation number

Q2. In writing chemical formulas, the name of the element

  1. with the negative oxidation number is written first
  2. with the positive oxidation number is written first
  3. for the non-metal is written first
  4. for the salt is written first

Q3. The chemical name for common table sugar is sucrose and its chemical formula is

  1. C10H20O10
  2. C12H21O12
  3. C12H22O11
  4. C11H22O12

Q4. The force of gravity on earth will make an object fall to the ground when it is thrown because

  1. the mass of the sun is greater than the earth’s
  2. the massof the stone is less than the person who threw the stone
  3. the mass of the person who threw the stone is more than the stone’s
  4. the mass of the earth is greater than the person who threw the stone

Q5. Which of the following istrue:

  1. All metals have magnetic properties
  2. Opposite poles of magnets repel each other
  3. The chemical formula for the mineral magnetite in lodestone rocks is Fe4O3
  4. Some magnets have a stronger magnetic force than others

Q6. The forces of attraction that create chemical bonds are described by:

  1. Coulomb’s Law
  2. Newton’s Law
  3. Boyle’s Law
  4. Lewis’ Law

Q7. Valence electrons are:

  1. in the innermost energy level of an atom
  2. in theoutermost energy level of an atom
  3. in any energy level of an atom
  4. not in an energy level of an atom

Q 8. Which of the following is correct about electronegativity?

  1. It increases from left to right across the periodic table
  2. It increases from top to bottom of the periodic table
  3. Francium is the most electronegative element
  4. The most electronegative elements have the lowest ionization energies

Q 9. Which of the following is NOT correct?

  1. Ionic bonds occur when two nearby atoms share electrons
  2. Covalent bonds occur when two nearby atoms share electrons
  3. Metallic bonds form when the atoms in a metal share their electrons spanning the entire object
  4. Metallic bonds form in elements that have high ionization energies

Q 10. Which of the following correct?

  1. Silver and gold are precious metals because they are more reactive than most other metals
  2. Luster is the ability to reflect heat
  3. Metals have good electrical conductivity because their neutrons cannot move easily throughout
  4. Metals have good thermal conductivity because their electrons are very good at carrying excited energy around

Q 11. Copper is commonly used in wiring because:

  1. It is highly malleable and ductile
  2. It is not a precious metal
  3. It is in group 11 of the Periodic Table
  4. It turns green if exposed to air for too long

Q 12. Which of the following is NOT true about Sir Isaac Newton:

  1. He proposed that white light is made of a mixture of different colored rays
  2. He invented the reflecting telescope
  3. He is known for his law of conservation of mass
  4. He is known for his theory of fluids

Q13. Using A, B, C, and D to represent chemical elements and compounds, a single replacement or displacement reactioncan be represented by:

  1. AB + CD -> AD + CB
  2. A + BC -> AC + B
  3. A + B -> AB
  4. AB -> A + B

Q 14. Which of the following is correct?

  1. An oxidation-reduction or redox reaction is a chemical reaction in which the oxidation number of the atoms does not change
  2. A redox reaction results is a net gain or loss of electrons
  3. Combustion and corrosion are examples of redox reactions that do not involve oxygen
  4. Redox reactions are common

Q 15. Which of the following is NOT correct?

  1. A chain reaction is a series of chemical reactions that never terminate
  2. Both products and reactants may be present at the same time in a reversible reaction
  3. The concentrations of the reactants and products do not change if the reaction is in equilibrium
  4. The equilibrium of a reaction can be manipulated

Q 16. Which of the following is correct?

  1. Endothermic reactions give off energy, often as heat
  2. Exothermic reactions give off energy, often as heat
  3. A catalyst can change the rate of reaction but is not consumed or changed
  4. The rate of a chemical reaction is not commonly affected by the concentration of the reactants

Q 17. Which of the following is NOT correct?

  1. Heat is sometimes released during a chemical reaction
  2. Heat is never required to initiate a chemical reaction
  3. A secondary product of a chemical reaction may not be a desired product
  4. The rate of a chain reaction is always very fast

Q 18. Which of following is NOT correct?

  1. There are no exceptions to the law of conservation of matter or mass
  2. Antoine Lavoisier changed chemistry from a qualitative science to a quantitative one.
  3. In a chemical reaction the reactants are shown on the left side of the equation and the products on the right
  4. Balancing chemical reaction equations is similar to solving mathematical ones

Q 19. Balance the following chemical reaction equation:

___ Fe2O3 + ___ CO -> ___ CO2 + ___ Fe

Q 20. Balance the following chemical reaction equation:

___ NO2 -> ___ N2 + ___ O2

Q 21. Balance the following chemical reaction equation:

___N2O5 -> ___ N2 + ___ O2

Q 22. Balance the following chemical reaction equation:

___ C2H6 + ___ O2 -> ___ CO2 + ___ H2O

Q 23. The weighted average mass of all of an element’s isotopes compared with 1/12 the mass of one atom of carbon-12 is the

  1. Atomic mass
  2. Relative atomic mass
  3. Relative atomic density
  4. Mass

Q 24. Which of the following is the correct value for Avogadro’s Number?

  1. 6.022 x 1023
  2. 6.025 x 1025
  3. 6.020 x 1020
  4. 6.021 x 1021

Q 25. Which of the following is correct?

  1. A mole of hydrogen contains Avogadro’s number of atoms of hydrogen
  2. A mole of carbon contains 12 times this number because carbon is 12 times heavier than hydrogen
  3. Mole Day parties for chemists start in third week of June at 10:23 am
  4. Avogadro’s Law states that for equal volumes of gases at the same temperature and pressure the gases will not have same numbers of molecules

Q 26. Which instrument is used to figure out the relative masses of atoms?

  1. Mass photometer
  2. Mass spectrometer
  3. Mass balance
  4. Mass electrogram

Q 27. In a solution of sugar water, which component would be considered the solute?

  1. Water
  2. Sugar
  3. Water and sugar
  4. None of the above

Q 28. 0.25 L of milk first only had 10ml of chocolate syrup. What will happen if 3 ml of milk are added?

  1. The concentration of syrup increases
  2. The concentration of syrup decreases
  3. The concentration of milk increases
  4. The concentration of milk decreases

Q 29. An equal volume of a 10% salt water solution is mixed with a 30% salt water solution. What is the final concentration of the combined salt water solution?

  1. 25 %
  2. 30 %
  3. 10 %
  4. 20 %

Q30. What would be most likely to happen to a solution if it is super saturated?

  1. Form crystals
  2. Evaporate
  3. Sublime
  4. Condense

Q31. Polar solvents usually

  1. have an even distribution of electrons
  2. have an uneven distribution of electrons
  3. have an average distribution of electrons
  4. have an uneven distribution of protons

Q32. Membranes use osmotic pressure to separate a/an ___ from a solution

  1. Solute
  2. Solvent
  3. Molecule
  4. Ion

Q33. Adding what material to water will increase its boiling point?

  1. Ice
  2. Soda
  3. Salt
  4. Hydrogen

Q 34. If pure water is mixed with another substance to form a solution, the boiling point of the new solution will be ___ than the boiling point of pure water

  1. Lower
  2. Higher
  3. The same
  4. The average of the two

Q 35. Which of the following is correct?

  1. A solution is a heterogeneous mixture of one or more substances dissolved in another
  2. The solvent is the active ingredient
  3. The solute is the active ingredient
  4. The solvent is the inert ingredient

Q 36. Which of the following is correct?

  1. The molarity of an 8 L solution containing 2 moles of NaCl is 0.25 M
  2. The molality of an 8 L solution containing 2 moles of NaCl is 0.25 M
  3. A concentrated solution contains a large amount of solvent compared to the amount of solute present
  4. The saturation point only changes significantly with temperature.

Q 37. Bases are solutions that are known to have an excess of ___

  1. Cations
  2. H+ ions
  3. Anions
  4. OH_ ions

Q 38. Bromothymol Blue (BTB) turns what color in the presence of an acid or base

  1. Yellow in acid, blue in base
  2. Pink in acid, green in base
  3. White in acid, yellow in base
  4. Blue in acid, white in base

Q 39. Which material would not be considered an indicator?

  1. Litmus paper
  2. Phenolphthalein solution
  3. Magnetic color paper
  4. Bromothymol Blue

Q40. Acids are known to have an excess amount of

  1. H ions
  2. OH ions
  3. O ions
  4. Positive ions

Q41. In regards to a pH scale, solutions with a pH of 7 are considered to be ___

  1. Basic
  2. Ionic
  3. Acidic
  4. Neutral

Q42. In regards to a pH scale, solutions with a pH of 0 to 6 are considered to be ___

  1. Ionic
  2. Acidic
  3. Neutral
  4. Basic

Q43. In regards to a pH scale, solutions with a pH of 8 to 14 are considered to be ___

  1. Basic
  2. Bases
  3. Alkalis
  4. All of the above

Q44. If the pH of a substance increases by 2 points, the acidity increases by

  1. 1000
  2. 100
  3. 10,000
  4. 10

Q45. What color does litmus paper change to in the presence of a base?

  1. Red
  2. Blue
  3. Pink
  4. White

Q 46. Which of the following is correct?

  1. Highly acid rain has a pH above 7
  2. Clean rain has a pH of 5.6
  3. Vinegar has a pH of 5.6
  4. Milk has a pH of 5.6

Q 47. Which of the following is NOT correct?

  1. Acids have a bitter taste and bases have a sour taste
  2. Acids have a sour taste and bases have a bitter taste
  3. All alkalis are bases
  4. Bases feel slippery to the touch

Q 48. Which of the following is correct?

  1. Cherries and beets appear red in acidic solutions but turn blue or purple in basic ones
  2. Cherries and beets appear red in basic solutions but turn blue or purple in acid ones
  3. Hydrangea flowers can be blue in either acidic or basic soil
  4. Hydrangea flowers can only be blue in basic soil

Q 49. Which of the following is NOT true?

  1. Ammonia is a base and an alkali
  2. Calcium carbonate is a base that is also an alkali
  3. Strong bases can be dangerous to your skin
  4. Bases are used to make soaps

Q 50. Which of the following is correct?

  1. Sea water is an acid
  2. Vinegar is an acid
  3. Coffee is a base
  4. Milk is a base
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