I need help with my bio quiz. please, If possible to answer the questions I prov
ID: 87244 • Letter: I
Question
I need help with my bio quiz. please, If possible to answer the questions I provided, it is all mutiple choice, its due at midnight. Thank you!
1. Which shows the elements carbon (C), hydrogen (H), oxygen (o), nitrogen (N), and phosphorus (P) in decreasing order by the number of covalent bonds they usually form? C P C O N H P O C N H P C O H N 2. Which property of water contributes most to the ability of fish in lakes to survive very cold winters? Strong cohesive forces ty differences at different temperatures Dens High heat capacity O High heat of vaporization O High surface tension 3. Which statement about isotopes is false? O Isotopes vary in the number of neutrons but not the number of protons. Isotopes have the same atomic number but not the same atomic weight. O Radioisotopes are unstable and spontaneously emit radiation. O Deuterium is an isotope of hydrogen containing one proton and two neutrons. Isotopes have virtually the same chemical reactivity.Explanation / Answer
Answer:
1) Decreasing order by number of covalent bonds:
Correct order P > C > N > O > H
2) Which property of water contributes most to the ability of fish in lakes to survive very cold winters?
Answer: Density differences at different temperature (water has maximum density, light frozen layer of ice floats on top due to less density and provides insulation)
3) Which statement about istopes is false?
Answer: Deuterium is an isotope of hydrogen containing 1 proton and 2 neutrons - FALSE (Deuterium contains 1 proton and 1 neutron)
4) Which equation represents a chemical reaction that obeys the law of conversation of matter?
Answer: C6H12O6 + 6O2 --> 6 CO2 + 6H2O - Correct (this is the reaction for photosynthesis for production of CO2)
5) The reactivity of an atom arises from: number of electrons in the outermost shell.
6) Which statement about chemical reactions is false? They may lead to creation or destruction of energy - FALSE (energy can neither be created nor be destroyed, it can merely be transformed from one form to another)
7) Which molecular structure could represent the molecule?
Answer: Last option CH3Cl is Correct (atomic no. 1,6, and 17 correspond to Hydrogen, Carbon and Chlorine, Chlorine can form one covalent bond)
9) For a covalent bond to be polar, the two atoms that form a bond must have: Differing electronegativities
10) Which Interaction between atoms is strongest: Covalent bonds - Correct Answer
11) Sweating is useful cooling device for human because water: absorbs a great deal of heat in changing from its liquid state to gaseous state - Correct Answer
12) Hydrocarbons are non polar and hydrophobic where as salts are polar and hydrophilic.
13) Given the avogadro's number, how many molecules of KCl are in 10-13 L of 1M KCl has 6.02 x 1010 molecules
(6.023 x 1023 * 10-13 = 6.023 x 1010)
14) Covalent bond formation depends upon the ability of atoms to share one or more pair of electrons with other atoms - Correct Answer
Element Number of covalent bodns Carbon 4 Hydrogen 1 Oxygen 2 Nitrogen usually 3 or 4 Phosphorus 5Related Questions
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