A
Which of these cannot be separated into its parts by an ordinary chemical or physical process?
A) An atom of carbon B) A mixture of salts(NaCl, Kl)
C) An acid of chlorine D) A compound of Nitrogen(NH3)
A) An atom of carbon
Which of the following statements best explains why "You Matter"?
A) I am a pure substance that cannot be broken down into simpler substances
B) I have mass, and I take up spaces
C) I have water in my body which is made of covalent bonds
D) I am made of energy
B) I have mass, and I take up spaces
Why is water known as the "universal solvent"?
A) It dissolves all known substances on Earth
B) It dissolves only solid substances
C) It dissolves substances faster than all other substances
D) It dissolves the greatest number of substances compared to other substances
D) It dissolves the greatest number of substances compared to other substances
A substance with a pH of 7 is-
Neutral
A proton has what charge?
Positive
Match the macromolecules with the following descriptions.
Lipids-________ Nucleic Acids-______
Carbohydrates-________ Proteins-________
A-(DNA & RNA) B-(Waxes,fats, & oils)
C-(Quick energy) D-(Makes up bones, muscle,ect)
Lipids-___B_____ Carbohydrates-___C_____
Nucleic Acids-___A___ Proteins-___D_____
An Atom is composed of electrons, protons, and neutrons. What is the electric charge on the Neutron
0 or neutral
What property of water allows droplets of water to form?
Cohesion
Is a substance with a pH of 1 more acidic than a substance with a pH of 4?
Yes
Water can travel up the tissues of a tree against the force of gravity due to a property called capillary action. For this to happen, what two properties work together?
A) Adhesion and Cohesion
B) Surface tension and density anomaly
C) High specific heat and cohesion
D) universal solvent and adhesion
A) Adhesion and Cohesion
Choose the following statements that are true about ice forming on water. Choose all that apply.
A) Ice is less dense than liquid water
B) Many animals need ice in winter to keep them cool
C) The ice forms a layer of insulation, helps water temp livable for aquatic life
D) Ice will eventually melt and add extra water to pond
E) The ice is denser than liquid water
A and C
A student makes a drawing of a carbon atoms. Which of these should the student show in the nucleus of the atom? Check all that apply.
- Ions - Electrons - Protons - Neutrons
- Protons & Neutrons
A mist is rising off a lake because the water is warmer than the air. This is an example of -
A) Surface tension at the top of the lake
B) Water having a high specific heat
B) Capillary action moving water vapor upward
D) The negative charge at the surface of the water repels the negative charges of the water vapor
B) Water having a high specific heat
What is responsible for hydrogen bonds?
The attraction between a negative oxygen of one molecule and a positive hydrogen of another.