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
Basic building blocks of all matter are -
A) atoms B) cells C) molecules D) compounds
A) Atoms
What property of water allows droplets of water to form?
Cohesion
Using the information below, determine how many protons an atom of gold has.
Atomic symbol is Au
Atomic number is 79
Atomic weight is 196.97
79
Is a substance with a pH of 1 more acidic than a substance with a pH of 4?
Yes
A molecule with uneven charges is described as -
A) Covalent B) Ionic C) Non polar D) Polar
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
What property of water helps it maintain a constant, stable temperature on Earth?
A) high heat capacity B) Capillary Action
C) Surface Tension D) Universal solvent
A) High Heat Capacity
What element is found in all living things?
A) Atoms
B) Carbon
C) Water
D) Protein
B) Carbon
Which statement best describes how a leaf can float on the surface of the water?
A) The leaf is made of lipids which mix well with water
B) The high heat capacity of the water allows objects to float on the surface
C) The hydrogen bonds between water molecules create a film on the surface known as surface tension
D) Water molecules are attached to one other and create capillary action, allowing water to get sucked up
C) The hydrogen bonds between water molecules create a film on the surface known as surface tension
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
Solve for how many neutrons are there in an atom of Lithium using the following information -
Atomic symbol is Li
Atomic number is 3
Atomic weight is 6.94
4
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
Have your teacher draw a water (H20) molecule on the board. What does the center portion represent?
A) An atom of hydrogen that has a positive charge
B) An atom of oxygen that has a positive charge
C) An atom of oxygen that has a negative charge
C) An atom of oxygen that has a negative charge
Mr. Varner decides to become a dance aerobics instructor. A few hours before his first class, he remembers he should consume one of the macromolecules, but he can't remember which one. Can you help him?
Carbohydrates
A professional body builder would most likely want to increase their consumption of what macromolecule?
Proteins
What is responsible for hydrogen bonds?
The attraction between a negative oxygen of one molecule and a positive hydrogen of another.
Which statement best describes the high specific heat of water?
A) The water temperature increases steadily as it absorbs heat overtime
B) The water temperature remains constant event though it is being heated over time
C) The temperature of the water rises then falls as time increases
D) Water is able to absorb for an extended amount of the time before it changes from one state to the next
D) Water is able to absorb for an extended amount of the time before it changes from one state to the next