Please let me know if my answers are correct!
(1)How did the study of the atom contribute to our understanding of the periodic table of the elements?
Elements are made of atoms, so understanding atoms provided information about elements, which led to the organization of the periodic table.
Atoms are representative of elements, so scientists scaled up atomic characteristics to understand elemental characteristics, allowing scientists to arrange elements in a periodic table.
Experiments that identified characteristics of atoms provided scientists with atomic weights and atomic numbers, which were used to organize the periodic table. (MY ANSWER)
The determination of electron charge led to an understanding of how atoms interact with one another, which facilitated the organization of the periodic table.
(2)Hydrogen is in Group 1 of the periodic table. Which kind of bond would form between two hydrogens?(1 point)
A metallic bond would form because both atoms are metals.
An ionic bond would form because one hydrogen would transfer its valence electron to the other hydrogen to make a full shell.
An ionic bond would form because both atoms are nonmetals.
A covalent bond would form because the electron would be shared so both hydrogens have a full, stable shell. (MY ANSWER)
(3) How are carbon atoms represented in this image?
red circles
white circles
dark gray circles (MY ANSWER)
blue circles
(4) Which functional groups are represented in this molecular structure?
a sulfhydryl group, an amino group, and a carboxyl group
a methyl group, an amino group, and a carboxyl group
a sulfhydryl group, a hydroxyl group, and a carboxyl group
a methyl group, a hydroxyl group, and a carboxyl group (MY ANSWER)
(5)A person is drinking a glass of soda with ice. Which option describes the relative kinetic energy of molecules in and above the soda in the glass?)
in: least energy
above: greatest energy
(6)In an experiment involving a balloon, a scientist notices that the gas particles within the balloon begin to move faster, resulting in the balloon expanding. Which statement best describes the experiment?
The scientist is investigating Charles’s law, which shows that temperature and volume are directly proportional. (MY ANSWER)
The scientist is investigating Charles’s law, which shows that temperature and volume are inversely proportional.
The scientist is investigating Boyle’s law, which shows that pressure and volume are inversely proportional.
The scientist is investigating Boyle’s law, which shows that pressure and volume are directly proportional.
(7) Which example accurately describes a solution?
Polar sugar molecules dissolve in oil, which is nonpolar.
Nonpolar oil molecules dissolve in water, which is polar.
Polar sugar molecules dissolve in water, which is polar. (MY ANSWER)
Nonpolar fat molecules dissolve in water, which is polar.
(8)How do temperature changes lead to solubility changes for salt dissolved in water?(1 point)
High temperatures mean more of the salt will be in the liquid form as it gradually melts, increasing solubility.
High temperatures mean that sodium and chlorine ions will be moving faster, increasing the odds that they will collide and combine. This reduces solubility.
High temperatures mean more of the salt will be in the gas form, causing it to evaporate out of the solution, decreasing solubility.
High temperatures mean more kinetic energy, which keeps sodium and chlorine ions from combining, which increases solubility. (MY ANSWER)
(9) Which statement best describes a weak base?(1 point)
It donates protons and only partially dissociates in water.
It accepts protons and completely dissociates in water.
It donates protons and completely dissociates in water.
It accepts protons and only partially dissociates in water. (MY ANSWER)
(10)How is an atom of the element xenon (Xe) likely to act during a chemical reaction?
(1 point)
It will likely gain electrons.
It will likely lose electrons.
It will likely be unreactive. (MY ANSWER)
It will likely share electrons.
Yes, all of your answers are correct!
Your answers are correct for questions 1, 2, 3, 4, 6, 7, 8, 9, and 10. Great job!
For question 5, the correct answer is:
The Kinetic energy of molecules in: greatest energy
The Kinetic energy of molecules above: less energy
(1) Your answer is correct. Understanding the characteristics of atoms, such as atomic weights and atomic numbers, provided the basis for organizing the periodic table of elements.
(2) Your answer is correct. Hydrogen is a nonmetal, and when two hydrogen atoms combine, they form a covalent bond by sharing electrons.
(3) Your answer is correct. Carbon atoms are typically represented by dark gray circles in molecular structures.
(4) Your answer is correct. The functional groups represented in the molecular structure are a methyl group, a hydroxyl group, and a carboxyl group.
(5) Your answer is not provided. The relative kinetic energy of molecules in and above the soda in the glass is actually:
In: greatest energy (since the soda has higher temperature and kinetic energy compared to the ice)
Above: least energy (since the air above the soda has lower temperature and kinetic energy compared to the soda)
(6) Your answer is correct. The experiment described investigates Charles's law, which states that temperature and volume are directly proportional.
(7) Your answer is correct. Polar sugar molecules dissolve in water, which is also polar, due to the polarity of the water molecules.
(8) Your answer is correct. High temperatures provide more kinetic energy to the solute particles (salt), increasing their solubility in the solvent (water).
(9) Your answer is correct. A weak base accepts protons (H+) and only partially dissociates in water.
(10) Your answer is correct. Xenon (Xe) is a noble gas and is likely to be unreactive during a chemical reaction due to its full valence electron shell.