Nature of Chemistry Warmups

1

• Nature of Chemistry Warmups

2
Warmup-Week 1

• Which list includes elements with the most
  similar chemical properties? TEKS -5B
• A) Br, Ga, Hg
• B) Cr, Pb, Xe
• C) O, S, Se
• D) N, O, F

3
Answer

• C is the correct answer. They are all in group
  16.

4

• 2. Which statement describes a chemical change?
  TEKS-4A
• A) Alcohol evaporates.
• B) Water vapor forms snowflakes.
• C) Table salt (NaCl) is crushed into powder.
• D) Glucose (C6H12O6) and oxygen produce CO2
  and H2O.

5
Answer

• D is the correct answer. Something new has been
  produced.

6

• 3. A mixture of sand and table salt can be
  separated by filtration because the substances in
  the mixture differ in- TEKS-4B
• A) Boiling point
• B) Density at STP
• C) Freezing point
• D) Solubility in water

7
Answer

• D is the correct answer. Salt dissolves in
  water, sand cant.

8

• 4. The elements on the Periodic Table are
  arranged in order of increasing- TEKS-5A
• A) Atomic number
• B) Mass number
• C) Number of isotopes
• D) Number of moles

9
Answer

• A is the correct answer. Atomic number and
  protons are equal. Protons determine the
  elements identity.

10

• 5. Which substance can not be broken down by a
  chemical change? TEKS-4A
• A) Ammonia
• B) Mercury
• C) Propane
• D) Water

11
Answer

• B is the correct answer. Mercury is an element
  and already in simplest form.

12

• 6. The temperature of a sample of matter is a
  measure of the- TEKS-4B
• A) Average kinetic energy of its particles
• B) Average potential energy of its particles
• C) Total kinetic energy of its particles
• D) Total potential energy of its particles

13
Answer

• A is the correct answer. It is not possible to
  measure the total kinetic energy at once. The
  average kinetic energy is the correct answer.

14

• 7. Solid, liquid and gaseous water are all
  present at very low pressure near 0C. How do
  the distances between the molecules in the three
  states compare under these conditions? TEKS-4C
• A) The distances are equal in all three states.
• B) Distances are similar in the solid and
  liquid, which are smaller than that in the gas.
• C) Distances are smallest in the solid, and
  similar in the liquid and gas
• D) Distances are smallest in the liquid, and
  similar in the solid and the gas.

15
Answer

• B is the correct answer. Distances will always
  be greatest in a gas at low pressure.

16

• 8. What change(s) occur(s) when a liquid boils?
  TEKS-4C
• The average energy of the particles increases.
• The attractive forces between the particles
  become stronger.
• The spacing between the particles increases.
• A) I only
• B) III only
• C) II and III only
• D) I and III only

17
Answer

• D is the correct answer. Spacing and energy
  increases with boiling due to kinetic energy.

18

• 9. Which process results in a chemical change?
  TEKS-4A
• A) Tearing tin foil
• B) Melting an iron bar
• C) Crushing an aluminum can
• D) Burning magnesium ribbon

19
Answer

• D is the correct answer. A chemical change is
  when something new is produced or destruction has
  occurred.

20

• 10. Which two particles have opposite charges?
  TEKS-5A
• A) An electron and a neutron
• B) An electron and a proton
• C) A proton and neutron
• D) A proton and positron

21
Answer

• B is the correct answer. An electron has a
  negative charge and a proton has a positive
  charge.

22

• 11. Which statement describes a chemical property
  of aluminum? TEKS-4A
• A) Aluminum is malleable.
• B) Aluminum reacts with sulfuric acid.
• C) Aluminum conducts an electric current.
• D) Aluminum has a density of 2.698 g/cm3 at STP

23
Answer

• B is the correct answer. Reacts is a clue word
  for chemical property and change.

24

• 12. Which substance can be broken down chemical
  means? TEKS-4D
• A) Magnesium
• B) Manganese
• C) Mercury
• D) Methanol

25
Answer

• D is the correct answer. A, B, and C are on the
  periodic table. D can be the only correct answer
  (it is a compound).

26

• 13. Which statement describes a chemical property
  of bromine- TEKS-4A
• A) Bromine is soluble in water.
• B) Bromine has a reddish-brown color.
• C) Bromine combines with aluminum to produce
  AlBr3.
• D) Bromine changes from a liquid to a gas at
  332K and 1atm.

27
Answer

• C is the correct answer. Something new is
  produced so it is chemical.

28

• 14. In which type of reaction is an atom of one
  element converted to an atom of a different
  element?
• A) decomposition
• B) neutralization
• C) saponification
• D) transmutation

29
Answer

• D is the correct answer.