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WorksheetsUnit 2.1 - 2.2 (Nature of Life + ABC)
Total questions: 15
Worksheet time: 8mins
What are the subatomic particles of an atom?
nucleus, membrane, DNA
protons, electrons, neutrons
covalent, ionic, hydrogen bonds
negative, positive, zero
The 6 most common elements that make up 99% of living things are:
Carbon, oxygen, potassium, nitrogen, hydrogen, and calcium
Carbon, oxygen, potassium, hydrogen, calcium, and magnesium
Carbon, oxygen, calcium, hydrogen, phosphorus, and nitrogen
Carbon, oxygen, magnesium, calcium, salt, and nitrogen
Interactions that give a molecule its chemical properties are known as:
intramolecular interactions
stable interactions
identifying interactions
intermolecular interactions
Which of the main types of interactions is BOTH intramolecular AND the strongest?
ionic
van der Waals
hydrogen bonds
covalent
In order for van der Waals forces to be effective in holding molecules together, the molecules must be:
close together & polar
ionic & charged
close together & geometrically aligned
next to each other & side by side
Which of the following is an example of a compound?
H2 gas (hydrogen gas)
O2 (oxygen gas)
CO (carbon monoxide)
Cl2 (chlorine gas)
Why might an electron not be found in the same exact place at all times?
Electrons can go wherever they want, so it’s impossible to predict their location
Electrons are in constant motion around the nucleus, so they shift location frequently
Electrons carry a negative charge, so they are unstable and never follow a pattern of movement
Electrons are tiny, so they would be really difficult to locate
What does a scientist look at to determine how many atoms of each element are present in a chemical compound?
the chemical formula
the periodic table of elements
the number of valence electrons
the coefficients
Hydrogen bonds occur between:
The (δ-) of an Oxygen atom and the (δ+) of a Hydrogen atom
The (δ+) of an Oxygen atom and the (δ-) of a Hydrogen atom
The (δ+) of a Hydrogen atom and the (δ+) of another Hydrogen atom
The (δ-) of an Oxygen atom and the (δ-) of another Oxygen atom
______________ result from covalent bonds ; _________________ result from ionic bonds
polarity; charged particles
molecules; ions
ions; molecules
compounds; charges
Plants are able to draw water through their roots and into their stems through small tubules, at no energy cost to the plant. How is this possible?
Cohesion causes the water molecules to climb up the tubules into the plant stem.
Adhesion causes the water molecules to cling to the molecules of the plant tubules, traveling upwards into the stem.
The high heat capacity of water causes the water molecules in the soil to move quickly, eventually causing them to jump up into the tubules.
The partial charges of the water molecules in the soil are attracted to the nonpolar lining of the plant’s tubules, so they cling to the tubules and climb up into the stem.
Why is it beneficial for water to have a high heat capacity?
A high heat capacity is what keeps shower water from becoming too hot and causing skin burns
The high heat capacity lowers the boiling point of water, so it doesn’t take as long to boil and saves us time when cooking
Water does not have a high heat capacity
Our cells live in aquatic environments, much like fish, so a high heat capacity keeps those environments from becoming too hot to sustain life
You mix lemonade powder into a glass of water and notice that the powder completely dissolves. Select all that are TRUE:
the mixture is a suspension
the mixture is a solution
the solvent is the water
the solute is the water
the solvent is the lemonade powder
Which property of water makes it a universal solvent?
its hydrogen bonds can form between many different molecules
water is polar, so its + and - charges attract ionic compounds & other polar molecules
water cannot be saturated, so there is no limit to what it can dissolve
water is the only solvent that can be used for any solution
You test an unknown solution with a pH strip and find that it has a pH of 3. What can you assume about this solution? Select all that apply.
the solution is basic
the solution is acidic
the compound produces hydroxide ions in solution
the compound produces hydrogen ions in solution
the solution has a high concentration of H+ ions
