Chapter 2.1 and 2.2 Created by Educational Technology Network. www.edtechnetwork.com 2009

The Atom Molecules Properties of Water Acids and Bases Potpourri 10 20 30 40 50

Question 1 - 10 The positively charged particles found in the nucleus of an atom.

Answer 1 – 10 What is a proton?

Question 1 - 20 The number of protons The number of neutrons The number of electrons

Answer 1 – 20 Protons- 26 Neutrons- 30 Electrons- 26

Question 1 - 30 The name of this element

Answer 1 – 30 What is Beryllium?

Question 1 - 40 Carbon-14 is a radioactive form of the element Carbon. It has 6 protons, but 8 neutrons. The term that describes this phenomenon is an…

Answer 1 – 40 What is an isotope?

Question 1 - 50 The number of electrons that a Flourine ion would have if it had a NEGATIVE overall charge.

Answer 1 – 50 What is 10?

Question 2 - 10 The number of glucose molecules in the formula 3C6H12O6

Answer 2 – 10 What is 3?

Question 2 - 20 The type of bonding that forms when electrons are given away by one atom and accepted by another.

Answer 2 – 20 What is an ionic bond?

Question 2 - 30 Weak forces between slightly positive or slightly negative charge are called…. Hint: These forces allow geckos to climb walls and ceilings!

Answer 2 – 30 What are Van-der-Waals forces

Question 2 - 40 The sharing of electrons between two or more elements creates strong bonds called…

Answer 2 – 40 Covalent bonds

Question 2 - 50 O2 is an example of a…

Answer 2 – 50 What is a molecule? Since O2 only is made of one type of element, it is a molecule, not a compound Compounds are made when two or more elements come together… i.e. H2O

Question 3 - 10 The slight partial positive and partial negative charge on a water molecule is called….

Answer 3 – 10 What is polarity Polarity is caused by uneven sharing of electrons Oxygen becomes partial negative The two Hydrogen atoms becomes partial positive

Question 3 - 20 Because of strong attractions between the partial negative charge of Oxygen and the partial positive charge of Hydrogen, water molecules are attracted to each other. This is caused by…

Answer 3 – 20 What are hydrogen bonds?

Question 3 - 30 Because of strong attractions between the partial negative charge of Oxygen and the partial positive charge of Hydrogen, water molecules are attracted to each other. This property of water is known as…

Answer 3 – 30 What is cohesion?

Question 3 - 40 The temperature of the beach is considerably more moderate due to water’s ability to have…

Answer 3 – 40 What is high heat capacity?

Question 3 - 50 Water rising in a thin glass tube is a combination of these two properties of water.

Answer 3 – 50 What is capillary action?

Question 4 - 10 A series of drops of HCl were added to three solutions. A graph of that data is pictured below. Which line is most likely the buffer?

Answer 4 – 10 What is the orange/yellow line?

Question 4 - 20 A mystery substance is added to the beaker pictured below. After some investigation, it is found that there are more OH- ions than there are H+ The substance added was likely a…

Answer 4 – 20 What is a base?

Question 4 - 30 Black coffee has a pH of around 5. Orange juice has a pH around 3. How many more times acidic is orange juice?

Answer 4 – 30 What is 100 more times acidic Each jump on the pH scale makes the substance 10 times more acidic. 54= 10 x 53= 100x

Question 4 - 40 A substance that helps prevent large changes in acidity is known as a…

Answer 4 – 40 What is a buffer?

Question 4 - 50 While testing bleach with litmus paper, you get a reading of pH 12. This means bleach is…

Answer 4 – 50 What is a base?

Question 5 - 10 Radioactive isotopes are useful to scientists for several reasons. List one.

Answer 5 – 10 Kill bacteria Determine the age of rocks and fossils Detect and treat cancer

Question 5 - 20 Sugar is dissolved in water. In this case the solute is…

Answer 5 – 20 What is sugar?

Question 5 - 30 NaCl is dissolved in water because it is….

Answer 5 – 30 What is a polar molecule?

Question 5 - 40 Osmium is an element with 76 protons in its nucleus. What happens if it were to lose 2 protons?

Answer 5 – 40 What is Tungsten

Question 5 - 50 Strong cohesive attraction between water molecules creates a force that allows small objects, like raft spiders or water striders to be supported. This force is known as…

Answer 5 – 50 Surface tension