Journal Entries that will be checked off with test

You must have the following journal entries in order by date when you take the ch. 2 and 3 exam.......

HBIO Class Opening Journal 9-3 and 9-4
• Please start your journal with today’s date!
• Please be sure to answer each question in detail and number all the questions

1) How many electrons does Ne have?
2) How many electrons shells?
3) How many unpaired electrons are there?





HBIO Class Opening Journal 9-5 and 9-8
• Please start your journal with today’s date!
• Please be sure to answer each question in detail and number all the questions

1) A nitrogen atom has 7+ and the most common isotope of nitrogen has 7 neutrons. A isotope of nitrogen has 8 neutrons. What is the atomic number and mass number of this isotope that has 8 neutrons? Write as a chemical symbol with a subscript and superscript.
2) Explain why salt is a compound while the oxygen we breathe is not.
3) What are the 6 most common elements in biology?



HBIO 9-9 and 9-10
• Please start your journal with today’s date!
• Please be sure to answer each question in detail and number all the questions
True or False
1) Energy is anything that occupies space and has weight.
2) Matter can exists as a solid, liquid, or gas.
3) Sulfur and phosphorus are SOME of the six most common elements in living organisms.
4) Isotopes of an element contain the same number of protons and different numbers of electrons.
5) Isotopes of an element contain the same number of protons and different numbers of neutrons.
6) Most isotopes are stable, but some are unstable and break apart, releasing radiation and are known as radioactive isotopes
7) Electrons in different electron shells contain more energy if they are further from the nucleus.
8) Atoms can interact to give up, accept, or share electrons to produce a filled outer shell.
9) Ions dissolve easily in water because water is polar in nature.
10) Water moderates the temperatures on earth because it can absorb and release large amounts of heat.



HBio 9-11 and 9-12
• Please start your journal with today’s date!
• Please be sure to answer each question in detail and number all the questions

1) One liter of a solution of pH 2 has how many more hydrogen ions (H+) than 1 L of a solution of pH 6?
A) 4 times more
B) 400 times more
C) 4,000 times more
D) 10,000 times more
E) 100,000 times more

2) One liter of a solution pH 9 has how many more hydroxide ions (OH-) than 1 L of a solution of pH 4?
A) 5 times more
B) 100 times more
C) 1,000 times more
D) 10,000 times more
E) 100,000 times more

3) Which of the following statements is true about buffer solutions?
A) They maintain a constant pH when bases are added to them but not when acids are added to them.
B) They maintain a constant pH when acids are added to them but not when bases are added to them.
C) They maintain a constant pH of exactly 7 in all living cells and biological fluids.
D) They maintain a relatively constant pH.
E) They are found only in living systems and biological fluids.