Homework Answers
Question 31
Answer: According to Rutherford the nucleolus of a typical atom is very small compared to the size of the atom
Option 1 is correct
Question 22
Answer: A heterogeneous mixture is a mixture with a non-uniform composition. The composition varies from one region to another with at least two phases that remain separate from each other, with clearly identifiable properties.
Option 4 is correct
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Question 31 1 pts According to the Rutherford, the nucleus of a typical atom is O...
Permanent & Variable Atmospheric Gases Percent of Atmosphere (0% H,O) 78% 21% 1% Percent of Atmosphere...
Permanent & Variable Atmospheric Gases Percent of Atmosphere (0% H,O) 78% 21% 1% Percent of Atmosphere (1% H,O) 77% Percent of Atmosphere 12% H,O) 76% 21% 1% 2% Percent of Atmosphere (3% H,O) 76% 20% 1% 3% Percent of Atmosphere (4% H,0) 75% 20% 1% 4% 21% 1% 1% TABLE 1-2 3. According to Table 1-2. W ording to Table 1-2, what happens to the percentage of nitrogen and oxygen in the atmosphere as the percentage of water vapor increases...
Question 1 1 pts Why is the spin quantum number important? It allows us to distinguish...
Question 1 1 pts Why is the spin quantum number important? It allows us to distinguish whether atoms are positive or negative It means that two electrons can be placed in each orbital without violating the Pauli Exclusion Principle It allows us to determine whether there are more neutrons or protons present in the nucleus of an atom It means that electrons are spinning around different axes; if the axes spontaneously aligned the atom would be destroyed
Question 1 6 pts Consider a hypothetical, non-linear molecule with three atoms. The symmetry number (o)...
Question 1 6 pts Consider a hypothetical, non-linear molecule with three atoms. The symmetry number (o) is 1. The three vibrational wavenumbers are 1,071 cm 1, 1,385 cm 1 and 1,254 cm 1. Use Yates & Johnson equation 5.52 (and a finite difference approximation of the differential) to compute the contribution of vibrations to the molar internal energy at T = 435 K. Note: this assumes that the molecules are noninteracting. Uvid = — mo Note: the required precision is...
Question 1 2.5 pts Some reactions serve to break down molecules (like glucose) to release energy...
Question 1 2.5 pts Some reactions serve to break down molecules (like glucose) to release energy that is stored in them. These types of reactions are (1). Other reactions have the opposite role and serve to build larger molecules. These types of reactions require energy input and are (2). The "batteries of the cell are used to transfer this energy between the two types of reactions above. The fully charged version of the battery that can be used to power...
Question 1 What is the net electric charge (in units of e) of an atom of...
Question 1 What is the net electric charge (in units of e) of an atom of lead (Z82)? qlead exact number, no tolerance Attempts: 0 of 5 used Question 2 Suppose a lithium atom (Z units of e? 3) has been singly ionized. What is the net electric charge of the resulting lithium ion in lithium exact number, no tolerance Attempts: 0 of 5 used Question 3 Suppose a lead atom (Z = 82) has been doubly ionized. What is...
QUESTION 19 Why is it very difficult to fight viral infections? O A virus is not...
QUESTION 19 Why is it very difficult to fight viral infections? O A virus is not alive and therefore impossible to kill. It is hard to destroy a virus without damaging the host. The cell wall of a virus is too thick to penetrate. The RNA and DNA of a virus is too different. O A and B QUESTION 20 Which is better for you: a drug that is a natural product or one that is synthetic? Whether a drug...
Question 1 1 pts Why is it important for DNA to have complementary base pairing? O...
Question 1 1 pts Why is it important for DNA to have complementary base pairing? O Complementary base pairing allows base pairs to be packed in the most energetically favorable arrangement inside of the double helix structure. O Complementary base pairing will pair a purine with a purine, which are a similar width, thus they are able to hold the sugar-phosphate backbone an equal distance apart along the DNA molecule o Complementary base pairing is only important for maintaining the...
Question 1 1 pts In Steels, the final two "xx" numbers in the AISI/SAE nomenclature denote:...
Question 1 1 pts In Steels, the final two "xx" numbers in the AISI/SAE nomenclature denote: Owt% Fe Vickers Hardness Heat Treatment Temperature wt%C Question 2 1 pts The Hardenability of the material with an increase in the alloy composition decreases stays the same increases Question 3 1 pts The difference between "hot working" and "cold working" is whether the work process is being done above or below the temperature Oroom Orecrystallization Oeutectoid Omelting Question 4 1 pts Gray Iron...
Separating a Mixture, Recrystallization, pre-lab assignment could you also explain why you chose that substance for...
Separating a Mixture, Recrystallization, pre-lab
assignment
could you also explain why you chose that substance for the empty
spaces and question marks
EXPERIMENT 4 Pre-Lab Assignment Separating a Mixture, Recrystalliration Name Date 1. Complete the following flowchart which shows how to separate a mixture of sand, sodium chloride and acetanilide. Notice that after a separation process (a down arrow) the filtered solids are shown on the left and the filtrate (the liquid) is shown on the right. The terminal step...
Question 16 1 pts A typical indifference curve is negatively sloped because: as we consume more...
Question 16 1 pts A typical indifference curve is negatively sloped because: as we consume more of one good, we are willing to give up the consumption of another good without changing our utility higher indifference curves represent higher levels of utility higher indifference curves represent lower levels of utility we assume that a consumer's income is constant Question 17 1 pts A typical indifference curve: O is convex to the origin (bowed in) has a constant slope is concave...
Permanent & Variable Atmospheric Gases Percent of Atmosphere (0% H,O) 78% 21% 1% Percent of Atmosphere (1% H,O) 77% Percent of Atmosphere 12% H,O) 76% 21% 1% 2% Percent of Atmosphere (3% H,O) 76% 20% 1% 3% Percent of Atmosphere (4% H,0) 75% 20% 1% 4% 21% 1% 1% TABLE 1-2 3. According to Table 1-2. W ording to Table 1-2, what happens to the percentage of nitrogen and oxygen in the atmosphere as the percentage of water vapor increases...
Question 1 1 pts Why is the spin quantum number important? It allows us to distinguish whether atoms are positive or negative It means that two electrons can be placed in each orbital without violating the Pauli Exclusion Principle It allows us to determine whether there are more neutrons or protons present in the nucleus of an atom It means that electrons are spinning around different axes; if the axes spontaneously aligned the atom would be destroyed
Question 1 6 pts Consider a hypothetical, non-linear molecule with three atoms. The symmetry number (o) is 1. The three vibrational wavenumbers are 1,071 cm 1, 1,385 cm 1 and 1,254 cm 1. Use Yates & Johnson equation 5.52 (and a finite difference approximation of the differential) to compute the contribution of vibrations to the molar internal energy at T = 435 K. Note: this assumes that the molecules are noninteracting. Uvid = — mo Note: the required precision is...
Question 1 2.5 pts Some reactions serve to break down molecules (like glucose) to release energy that is stored in them. These types of reactions are (1). Other reactions have the opposite role and serve to build larger molecules. These types of reactions require energy input and are (2). The "batteries of the cell are used to transfer this energy between the two types of reactions above. The fully charged version of the battery that can be used to power...
Question 1 What is the net electric charge (in units of e) of an atom of lead (Z82)? qlead exact number, no tolerance Attempts: 0 of 5 used Question 2 Suppose a lithium atom (Z units of e? 3) has been singly ionized. What is the net electric charge of the resulting lithium ion in lithium exact number, no tolerance Attempts: 0 of 5 used Question 3 Suppose a lead atom (Z = 82) has been doubly ionized. What is...
QUESTION 19 Why is it very difficult to fight viral infections? O A virus is not alive and therefore impossible to kill. It is hard to destroy a virus without damaging the host. The cell wall of a virus is too thick to penetrate. The RNA and DNA of a virus is too different. O A and B QUESTION 20 Which is better for you: a drug that is a natural product or one that is synthetic? Whether a drug...
Question 1 1 pts Why is it important for DNA to have complementary base pairing? O Complementary base pairing allows base pairs to be packed in the most energetically favorable arrangement inside of the double helix structure. O Complementary base pairing will pair a purine with a purine, which are a similar width, thus they are able to hold the sugar-phosphate backbone an equal distance apart along the DNA molecule o Complementary base pairing is only important for maintaining the...
Question 1 1 pts In Steels, the final two "xx" numbers in the AISI/SAE nomenclature denote: Owt% Fe Vickers Hardness Heat Treatment Temperature wt%C Question 2 1 pts The Hardenability of the material with an increase in the alloy composition decreases stays the same increases Question 3 1 pts The difference between "hot working" and "cold working" is whether the work process is being done above or below the temperature Oroom Orecrystallization Oeutectoid Omelting Question 4 1 pts Gray Iron...
Separating a Mixture, Recrystallization, pre-lab
assignment
could you also explain why you chose that substance for the empty
spaces and question marks
EXPERIMENT 4 Pre-Lab Assignment Separating a Mixture, Recrystalliration Name Date 1. Complete the following flowchart which shows how to separate a mixture of sand, sodium chloride and acetanilide. Notice that after a separation process (a down arrow) the filtered solids are shown on the left and the filtrate (the liquid) is shown on the right. The terminal step...
Question 16 1 pts A typical indifference curve is negatively sloped because: as we consume more of one good, we are willing to give up the consumption of another good without changing our utility higher indifference curves represent higher levels of utility higher indifference curves represent lower levels of utility we assume that a consumer's income is constant Question 17 1 pts A typical indifference curve: O is convex to the origin (bowed in) has a constant slope is concave...
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