I did my best, can someone check and help me?
2.Based on the differences in electronegativities, with which atom is francium (Fr) most likely to form an ionic bond?(1 point)
Fr–Cl = 2.46
Fr–At = 1.50
Fr–I = 1.96
Fr–Se = 1.76 ***
2.Based on the differences in electronegativities, with which atom is francium (Fr) most likely to form an ionic bond?(1 point)
Fr–Cl = 2.46
Fr–At = 1.50
Fr–I = 1.96
Fr–Se = 1.76 ***
3. Which statement is the best description of the energy found in molecules of water? (1 point)
Hotter molecules have more kinetic energy.
A molecule's temperature is not connected to its energy.
Colder molecules have more thermal energy.
Colder molecules have more kinetic energy***
4. When potassium permanganate and glycerol react, the potential energy of the products is less than the potential energy of the reactants. Which statement about this reaction is correct?(1 point)
The activation energy of the system is negative.
The total potential energy of the system is constant.
The reaction is endothermic.
The reaction is exothermic.****
7. Endothermic reactions absorb a lot of energy. Exothermic reactions give off a lot of energy. Which type of reaction has a higher activation energy? Which one takes more energy to break up the bonds of the reactants?(1 point)
Endothermic reactions have a higher activation energy. Exothermic reactions require more energy to break up the bonds of the reactants.
Exothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants. *****
Exothermic reactions have a higher activation energy. Exothermic reactions require more energy to break up the bonds of the reactants.
Endothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.
9. Cobalt ions form complex ions with water and chloride as shown in the reaction. The left side of the reaction is pink, and the right side of the reaction is blue.
Co(H2O)62+ + 4Cl– + heat ⇄ CoCl42–+ 6H2O
Which statement about the system at equilibrium is correct?
Cooling a purple solution will turn it pink.
Adding water to a purple solution will turn it blue.
Adding hydrogen chloride (HCl) to a blue solution will turn it purple.
Heating a blue solution will turn it purple.
10. Why are rubber and metal both useful while making wire?(1 point)
Both are good insulators, but one is flexible while the other is rigid.
Both are flexible, but one reflects electromagnetic waves well while the other transmits them.
Both are good insulators, but one is more ductile than the other.
Both are flexible, but one conducts electricity while the other insulates.
11. A pharmaceutical company wants to extract an ingredient from pomace supplied by a certain food processing plant. Which process is the most efficient with the lowest environmental impact?(1 point)
high pressure, high temperature water extraction
catalyst extraction
enzyme extraction
organic solvent extraction
15. The molar mass of element A is 4 g/mol. The molar mass of element B is 16 g/mol. When the initial mass of element A is 48 grams, which mass of element B should be present?
64 grams
96 grams
192 grams
128 grams
16. Use the table of molar masses to answer the question.
Element Molar Mass (g/mol)
silicon 28.09
oxygen 16.00
How many molecules of silicon dioxide (SiO2) are there in a 15-gram sample?
1.251x10^23
1.503x10^23
2.049x10^23
6.022x10^23
19 A nucleus decays to produce a nucleus with one additional proton. Which type of decay did the nucleus undergo?(1 point)
beta-plus decay
gamma decay
alpha decay
beta-minus decay***
20 Which type of decay is a form of nuclear fission?(1 point)
beta-minus decay ***
alpha decay
gamma decay
beta-plus decay
Don't even try to use tommy's answers, they suck.
1.Example Bond Energies of Ionic Compounds
Li–F = 1036 kJ/mol
Li-Br = 807 kJ/mol
Na-F= 923 kJ/mol
Na-Br = 747 kJ/mol
Given the general trend with bond energies, which of the compounds would have the smallest bond energy?
Cs-Br
2.Based on the differences in electronegativities, with which atom is francium (Fr) most likely to form an ionic bond?
Fr–Cl = 2.46
3. Which statement is the best description of the energy found in molecules of water?
Hotter molecules have more kinetic energy.
4.When potassium permanganate and glycerol react, the potential energy of the products is less than the potential energy of the reactants. Which statement about this reaction is correct?
The reaction is exothermic.
5.Hydrochloric acid and sodium hydroxide react to produce water and sodium chloride in an endothermic reaction. Which statement must be true of the reaction?
More bond energy is absorbed on the reactants side than is released on the products side.
6. Imagine a graph. The x-axis is labeled "Time" and is measured in seconds, and the y-axis is labeled "Potential Energy" and is measured in kilojoules. The slope starts at 0 seconds with a plateau at 25 kJ. This plateau is labeled "Reactants." The slope then rises to a peak labeled "Activation Energy" at 78 kJ. Finally the slope drops to a plateau at 14 kJ and is labeled "Products."
What does the graph described above represent?
7.Endothermic reactions absorb a lot of energy. Exothermic reactions give off a lot of energy. Which type of reaction has a higher activation energy? Which one takes more energy to break up the bonds of the reactants?
Endothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.
8.Why is thermal energy (heat) required to freeze ice into crystals?
Heat must be released by the products in order to convert from the reactants.
9.Cobalt ions form complex ions with water and chloride as shown in the reaction. The left side of the reaction is pink, and the right side of the reaction is blue.
Co(H2O)62+ + 4Cl– + heat ⇄ CoCl42–+ 6H2O
Which statement about the system at equilibrium is correct?
Cooling a purple solution will turn it pink.
10.Why are rubber and metal both useful while making wire?
Both are flexible, but one conducts electricity while the other insulates.
11.A pharmaceutical company wants to extract an ingredient from pomace supplied by a certain food processing plant. Which process is the most efficient with the lowest environmental impact?
high pressure, high temperature water extraction
12.Which option is a modern reason for optimizing the mining process?
reducing environmental impact
13.Use the reaction to answer the question.
Fe2O3 + 3H2SO4
How many atoms of oxygen will be found in the product(s) of the reaction?
15
14.Use the table and equation to answer the question.
Element Atomic Mass (amu)
hydrogen 1
carbon 12
oxygen 16
CH4 + 2 O2 → CO2 + 2 H2O
The law of conservation of matter states that matter cannot be created nor destroyed. How does the balance equation above demonstrate this law?
The number of atoms, type of elements, and mass of reactants and products are equal.
15.Elements A and B react according to the following balanced equation.
3A2 + 2B → 2A3B
The molar mass of element A is 4 g/mol. The molar mass of element B is 16 g/mol. When the initial mass of element A is 48 grams, which mass of element B should be present?
64 grams
16. Element Molar Mass (g/mol)
silicon 28.09
oxygen 16.00
How many molecules of silicon dioxide (SiO2) are there in a 15-gram sample?
1.503×10^23
17Which statement about the number of protons and neutrons in a nuclear change is correct?
The relative numbers of protons and neutrons can differ before and after the change, but the total number of those particles remains the same.
18Which statement accurately describes nuclear fission?
Fission is a process in which a large nucleus is split into smaller nuclei.
19A nucleus decays to produce a nucleus with one additional proton. Which type of decay did the nucleus undergo?
beta-minus decay
20.Which type of decay is a form of nuclear fission?
alpha decay
21.Why do some atmospheric gases act as greenhouse gases, while others do not?
Greenhouse gases have more than two atoms, allowing them to vibrate and release radiation, warming the atmosphere.
22.Which option correctly identifies a cause and consequence of water pollution?
cause: acid rain
consequence: destruction of crops
23.Which outcome is the most likely result of eutrophication of a waterway?
toxic bacteria in the water supply
24.Despite fracking being a controversial process in the fuel industry, it is still used today. Why?
It reaches hard to get to oil and gas deposits.
Thank you so much for all the answers to the questions. "Saver is 100% correct! However, you are missing question 6 answer which is an exothermic reaction.
Saver and Life are both correct. Got a 100%
THANK YOU! I'll follow what you said and post 2 questions every 10 minutes so I don't overwhelm anyone. And I'm so sorry, I got desperate because I don't want to fail chemistry. I need to get to the next grade.
I can tell you quickly that I don't look forward to solving 20 questions from scratch to check your answers. You would do better to post a question or two at a time. Most tutors can do that much on short notice. So, I've copied the first few and I'll go through those. The others I'll leave for others OR you can post them one at a time. Also I note that I see duplicates as well as numbers that are not sequential.
2.Based on the differences in electronegativities, with which atom is francium (Fr) most likely to form an ionic bond?(1 point)
Fr–Cl = 2.46
Fr–At = 1.50
Fr–I = 1.96
Fr–Se = 1.76 ***
Frankly, I think these choices are ridiculous. The rule, and it is SOMEWHAT arbitrary, is that a difference in electronegativity (EN) of 1.8 is a 50% ionic/covalent character. Ionic character increases as the EN difference increases; therefore, you would expect the most ionic character from FrCl and the least from FrAt. But the ionic charcter of FrI is probably around 75%. I think the answer you want is FrCl.
2.Based on the differences in electronegativities, with which atom is francium (Fr) most likely to form an ionic bond?(1 point)
Fr–Cl = 2.46
Fr–At = 1.50
Fr–I = 1.96
Fr–Se = 1.76 ***
See the same question above.
3. Which statement is the best description of the energy found in molecules of water? (1 point)
Hotter molecules have more kinetic energy.
A molecule's temperature is not connected to its energy.
Colder molecules have more thermal energy.
Colder molecules have more kinetic energy***
I don't think you have the correct anwer. Remember that molecules move faster as they get hotter.
4. When potassium permanganate and glycerol react, the potential energy of the products is less than the potential energy of the reactants. Which statement about this reaction is correct?(1 point)
The activation energy of the system is negative.
The total potential energy of the system is constant.
The reaction is endothermic.
The reaction is exothermic.****
I agree.
2. To determine which atom francium (Fr) is most likely to form an ionic bond with based on electronegativities, we look for the highest difference in electronegativities.
In this case, we compare the electronegativities of francium (Fr) with chlorine (Cl), astatine (At), iodine (I), and selenium (Se). The differences in electronegativities are as follows:
Fr-Cl = 2.46
Fr-At = 1.50
Fr-I = 1.96
Fr-Se = 1.76
The highest difference in electronegativities is Fr-Cl with a value of 2.46. Therefore, francium (Fr) is most likely to form an ionic bond with chlorine (Cl).
3. The best description of the energy found in molecules of water is that hotter molecules have more kinetic energy. Kinetic energy is associated with the motion of molecules. When the temperature of a substance increases, the molecules move faster and have more kinetic energy.
4. When potassium permanganate and glycerol react, and the potential energy of the products is less than the potential energy of the reactants, the reaction is exothermic. Exothermic reactions release energy in the form of heat to the surroundings, resulting in a decrease in potential energy. Therefore, the correct statement is that the reaction is exothermic.
7. Endothermic reactions have a higher activation energy, while exothermic reactions require more energy to break up the bonds of the reactants. Activation energy is the energy needed to start a reaction by breaking the existing bonds in the reactants. Endothermic reactions require an input of energy to initiate the reaction and have a higher activation energy. Exothermic reactions release energy and have a lower activation energy.
9. Based on the given reaction and the colors observed, when a blue solution (right side of the reaction) is heated, it turns purple. Therefore, heating a blue solution will turn it purple.
10. Rubber and metal are both useful while making wire because rubber is a good insulator, providing electrical insulation, while metal conducts electricity. This combination allows for the flexibility of the rubber and the conductivity of the metal, resulting in wire that can transmit electricity while being flexible.
11. The most efficient process with the lowest environmental impact for extracting an ingredient from pomace supplied by a certain food processing plant would be enzyme extraction. Enzyme extraction utilizes enzymes to breakdown the desired ingredient, avoiding the use of high temperatures, high pressures, or organic solvents that may have a higher environmental impact.
15. To determine the mass of element B when the initial mass of element A is 48 grams, we need to consider the molar ratio between element A and element B. Given that the molar mass of element A is 4 g/mol and the molar mass of element B is 16 g/mol, we can set up a proportion:
(48 g A) / (4 g/mol A) = (x g B) / (16 g/mol B)
Simplifying the proportion, we find:
48/4 = x/16
12 = x/16
x = 12 * 16 = 192 g
Therefore, the mass of element B should be 192 grams.
16. To determine the number of molecules of silicon dioxide (SiO2) in a 15-gram sample, we need to convert the mass to moles and then use Avogadro's number to calculate the number of molecules. The molar mass of SiO2 is calculated by adding the molar masses of the constituent elements, silicon (Si) and oxygen (O):
Molar mass of SiO2 = (28.09 g/mol) + (16.00 g/mol) = 44.09 g/mol
Next, we calculate the number of moles in 15 grams of SiO2:
Number of moles = (15 g) / (44.09 g/mol) ≈ 0.34 mol
Finally, we use Avogadro's number (6.022 × 10^23 molecules/mol) to convert moles to molecules:
Number of molecules = (0.34 mol) × (6.022 × 10^23 molecules/mol) ≈ 2.049 × 10^23 molecules
Therefore, there are approximately 2.049 × 10^23 molecules of silicon dioxide (SiO2) in a 15-gram sample.
19. A nucleus that decays to produce a nucleus with one additional proton undergoes beta-minus decay. In beta-minus decay, a neutron in the nucleus converts into a proton and emits a beta-minus particle (an electron) and an antineutrino.
20. The type of decay that is a form of nuclear fission is alpha decay. In alpha decay, an unstable nucleus emits an alpha particle, which consists of two protons and two neutrons. Beta-minus decay involves the transformation of a neutron into a proton, and gamma decay involves the emission of gamma radiation (high-energy photons). Alpha decay, on the other hand, involves the release of an alpha particle.