To fight a bacterial infection, a patient was given an antibiotic to take for 10 days.
After the patient finished taking the antibiotics as directed, almost all the bacteria
were killed. After another 10 days, the patient was sick again with the same type of
infection. What most likely happened?
A. A few bacteria survived the antibiotics and stopped reproducing
B. Some bacteria were resistant to the antibiotic,and they reproduced
C. The antibiotic slowed the life cycle of the bacteria
D. The patient’s high fever inactivated the antibiotic,allowing the surviving bacteria to grown rapidly
Answers
Answer: B
Explanation: trust me
Related Questions
What is the charge on an ion that has 19 protons, 22 neutrons, 18 electrons?
Answers
List down 10 different types of minerals (metallic and non metallic) include the different uses and help in the economy of these minerals.
Answers
Answer:
names of 10 metallic minerals are Silver, Chromium, Tin, Nickel, Copper, Iron, Lead, Aluminum, Gold, and Zinc.
Explanation:
which type of alcohol undergo oxidation under normal conditions
Answers
Answer:
Primary alcohols can be oxidized to form aldehydes and carboxylic acids; secondary alcohols can be oxidized to give ketones. Tertiary alcohols, in contrast, cannot be oxidized without breaking the molecule's C–C bonds.
8. A rock dropped in a graduated cylinder raises the level of water from 20 mL to 35 mL.
The rock has a mass of 45 g. What is the density of the rock?
Answers
Answer:
3.0 g/cm\(3\)
Explanation:
If atom X had 3 valence electrons and atom Y had 7 valence electrons, the correct chemical formula for the ionic compound they would form is Choices: A) XY3 B) X3Y6 C) X2Y3 D) X3Y7
Answers
Answer:
A) XY3
In both of the atom, they want to have 8 valence electrons on the outer shell so they can become stable.
Which of the following molecules would be most favorable to undergo an E2 reaction rather than an SN2 reaction with NaOH
Answers
2-bromopropane molecules would be most favorable to undergo an E2 reaction rather than an SN2 reaction with NaOH. Here option B is the correct answer.
An E2 reaction occurs when a strong base removes a proton from a beta-carbon adjacent to a leaving group, leading to the formation of a double bond and the departure of the leaving group. An SN2 reaction, on the other hand, involves a nucleophile attacking the carbon bearing the leaving group while the leaving group departs.
The relative favorability of E2 and SN2 reactions depends on the strength of the nucleophile and the base, the steric hindrance around the carbon bearing the leaving group, and the nature of the leaving group.
In this case, NaOH is a strong base, and the molecule that is most favorable to undergo an E2 reaction is the one with the least steric hindrance around the carbon bearing the leaving group, which is 2-bromopropane. The other molecules have more steric hindrance around the carbon bearing the leaving group, making them less favorable to undergo E2 reactions.
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Complete question:
Which of the following molecules would be most favorable to undergo an E2 reaction rather than an SN2 reaction with NaOH?
a) 1-bromopropane
b) 2-bromopropane
c) 1-chloropropane
d) 2-chloropropane
heat from a fire is an example of?
a Radiation
b Conduction
c Convection
Answers
1 x 3 2 9. Find the value of x if-1 -1 2 | 04-21 10. Sobre the linear system using Cramer's rule = 16
Answers
The value of x is 1.
To solve the linear system using Cramer's rule, we need to find the value of x in the equation 1x + 3(2) + 9 = 16.
Simplifying the equation, we have:
x + 6 + 9 = 16
x + 15 = 16
x = 16 - 15
x = 1
Therefore, the value of x is 1.
Cramer's rule is a method used to solve systems of linear equations by using determinants. In this case, we have a single equation with one variable, so the determinant involved is a 1x1 matrix. The determinant of a 1x1 matrix is simply the value of the element.
The determinant of the coefficient matrix in this equation is 1. The determinant of the entire system is the determinant of the coefficient matrix divided by the determinant of the matrix formed by replacing the column of the variable with the constants.
Since the determinant of a 1x1 matrix is the value of the element, we have:
determinant of the entire system = determinant of the coefficient matrix / determinant of the constant matrix
= 1 / 1
= 1
Therefore, the determinant of the entire system is 1.
Using Cramer's rule, we can solve for the value of x by dividing the determinant of the matrix formed by replacing the column of the variable with the constants by the determinant of the coefficient matrix. In this case, both determinants are 1. Thus, The value of x is 1.
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Give the structures of the free‑radical intermediates in the peroxide‑initiated reaction of HBr
with the following alkene. Include all lone‑pair electrons and unpaired electrons. Hint: the radicals do not coexist in the same mechanistic step.
Answers
The peroxide addition would yield a product that is different from the antiperoxide addition
What is the structure?Markovnikov's rule states that when a protic acid HX is added to an alkene, the acid hydrogen (H) forms a bond with the carbon atom that has the greatest number of hydrogen atoms, while the halide (X) group forms a bond with the carbon atom that has the fewest hydrogen atoms.
This can be summed up with the phrases "the rich get richer" and "the poor get poorer" in terms of hydrogen. This fundamental principle of alkene chemistry aids in predicting the results of addition reactions.
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PLEAS EHELPP!!
True or false: lone pairs of electrons around the central atom do not influence the shape
of the molecule.
Answers
Lone pairs only affect molecular geometry if they are on the surrounding (B) atoms. A lone pair of electrons affects molecular geometry the same way another bond would: this is why ammonia has a tetrahedral structure. Lone pairs only affect molecular geometry if they are on the central (A) atoms.
If others adopted similar habits, how might the world of science change?
Answers
Answer:
Explanation:
Smoking a cigarette, snorting cocaine, or drinking yourself into oblivion are all easy habits to adopt because they light up your brain with the neurotransmitter …
*You have a 1.2 M solution of CaCi, that has a final volume of 0.050 L a.
How many moles of CaCly are generated in the reaction?
b.
How many grams of CaCly are generated in the reaction?
Answers
The number of moles is 0.06 moles while the mass is 6.66 g
What is the mole?The mole is a unit of measurement used in chemistry to express amounts of a substance. One mole of a substance is defined as the amount of that substance that contains as many entities, such as atoms, molecules, or ions, as there are in 12 grams of carbon-12, which is a common isotope of carbon.
Number of moles = 1.2 * 0.05
= 0.06 moles
Mass of the CaCl2 = 0.06 moles * 111 g
= 6.66 g
The mole is used to make it easier to compare the amounts of different substances in chemical reactions, and to calculate the amounts of reactants needed to produce a certain amount of product.
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2. Which of these activities would most likely be carried out by a civil engineer who
specializes in environmental engineering?
A. testing steel beams for a large bridge
B. brainstorming ways to prevent landslides on steep slopes
C. designing a new system for unloading cargo from rail cars
D. developing a robot to search for survivors of natural disasters
Answers
Applying physical and scientific concepts to the design, development, and maintenance of both the artificially produced environment as well as the naturally occurring built environment is known as civil engineering. The correct option is B.
What does a civil engineer do?In both the public and private sectors, civil engineers conceptualize, design, develop, supervise, run, and maintain infrastructure projects and systems, such as highways, buildings, airports, tunnels, dams, bridges, and water supply and sewage treatment systems.
Traditionally, civil engineering has been divided into a variety of sub-disciplines. It is defined to separate non-military engineering from military engineering and is regarded as the second-oldest engineering subject after military engineering.
A civil engineer make brainstorming ways to prevent landslides on steep slopes. In some locations, a civil engineer is qualified to do land surveying; in other locations, surveying is only permitted for building purposes without a different licence.
Thus the correct option is B.
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There are a number of factors that alter the bioavailability of minerals from foods. Complete each sentence with either increases or decreases.
decreases increases
Phytic acid ______ the absorption of zinc from grains.
Oxalic acid _____ the absorption of calcium from spinach.
Refinement of grains _____ the mineral content of grain products.
Vitamin C _____ the absorption of iron from foods.
Vitamin D ____ the absorption of calcium from foods.
Answers
Each sentence about the bioavailability of minerals in foods should be completed with either increases or decreases as follows:
Phytic acid decreases the absorption of zinc from grains.Oxalic acid decreases the absorption of calcium from spinach.Refinement of grains decreases the mineral content of grain products.Vitamin C increases the absorption of iron from foods.Vitamin D increases the absorption of calcium from foods.What are nutrients?Nutrients can be defined as the chemical compounds (substances) or minerals that are present in food, and they are needed by the body of a living organism for healthy growth, reproduction, development, proper functioning, and reproduction.
What are the classes of nutrients?In Science, there are five (5) main classes of nutrients and these include the following:
ProteinFatCarbohydrateVitaminsMineralsIn conclusion, phytic acid, oxalic acid, and refinement of grains are factors that decrease the bioavailability of minerals in foods while Vitamin C and Vitamin D increases the bioavailability of minerals in foods.
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Question 1
This diagram shows Earth in four different positions during its yearly orbit around the sun. Which of the following accurately describes the position of the United States during the summer months?
Question 2
The diagram models 4 lunar phases. During which one is the tide the highest?
Question 3
An HR Diagram is shown below. A star that has a luminosity of 10^-2 is likely a…
Question 4
Earth's atmosphere blocks short wavelengths of the electromagnetic spectrum. Which telescopes DO NOT need to be placed in orbit around Earth to observe short-length radiation?
Question 5
A student models the relationship between the Earth and the Sun using string and a ball. Which of the following explains the relationship demonstrated?
Answers
Answer 1:
During the summer months in the northern hemisphere (where the United States is located), Earth is in position C, which is when the northern hemisphere is tilted towards the sun.
Answer 2:
The highest tide occurs during the full moon phase, which is represented by position C in the diagram.
Answer 3:
A star that has a luminosity of 10^-2 is likely a red dwarf.
Answer 4:
Telescopes that observe short-wavelength radiation, such as X-rays and gamma rays, do not need to be placed in orbit around Earth because these wavelengths are absorbed by the atmosphere. Therefore, telescopes that observe these wavelengths are typically placed in space, outside of Earth's atmosphere.
Answer 5:
The student is likely demonstrating the relationship between the Earth and the Sun's gravitational pull. The ball represents the Sun, and the string represents the gravitational force pulling the Earth towards the Sun. The demonstration shows how the Earth orbits the Sun due to this gravitational force.
What is gravitational force?Gravitational force is described as a force that exists between any two objects in the universe that have mass.
It is the force that causes objects with mass to be attracted to each other. The magnitude of the gravitational force between two objects depends on their masses and the distance between them.
Along with the electromagnetic force, the strong nuclear force, and the weak nuclear force, gravity is one of the four fundamental forces of the universe.
Sir Isaac Newton initially introduced it in his law of universal gravitation, and Albert Einstein later elaborated on it in his theory of general relativity.
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When converting from moles into atoms, what number should you put on the top of the conversation factor?
Answers
The number of the atoms that should be the numerator is 6.02 * 10^23 atoms.
What is the conversion factor?We have to note that the conversion factor is the factor that can be used in the conversion of one unit to the other. We have to note that if we are able to change the unit then we can be able to make the conversion.
We have to note that the Avogadro's number is the number of atoms that we can find in one mole of a substance and it has a value of about 6.02 * 10^23 atoms in the atom of magnesium.
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A 1.90 g sample of elemental sodium, Na(s) is reacted with water, yielding sodium
hydroxide, NaOH, and hydrogen. 2Na(s) + 2H2O(l)→ 2NaOH(aq) + H2(g); The H2(g) is collected
over water at 18 oC. What are the partial pressures of the two gases (hydrogen and water
vapor) when contained in a 1.00 l container at 25
oC? What is the total pressure?
Answers
The partial pressure of hydrogen is 0.98 atm while the partial pressure of water is 0.02 atm. The total pressure of the system is 1 atm.
What is the pressure?We have seen the reaction as it has been shown in the equation that is attached to the question above. Now, we must have to find the number of moles of the hydrogen that was obtained.
Number of moles of sodium = 1.90 g/23 g/mol = 0.08 moles
2 moles of sodium produces 1 mole of hydrogen
0.08 moles of sodium would produce 0.08 moles * 1 mole/ 2 moles
= 0.04 moles
Given that;
P = pressure
V = volume
n = Number of moles
R = gas constant
T = temperature
PV = nRT
P = nRT/V
P = 0.04 * 0.082 * 298/1
P = 0.98 atm
The partial pressure of the hydrogen = 0.98 atm
The partial pressure of the water = SVP of water at 18°C = 0.02 atm
Total pressure of the system = 0.98 atm + 0.02 atm = 1 atm
The system has a total pressure of 1 atm.
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Intravenous lidocaine therapy is started for a patient. The doctor's order says to add 1.0 grams of lidocaine to 250 mL of I.V. solution and deliver it to the patient at 4.0 mg/min. In this particular I.V., 20. drops = 1.0 mL. What is the flow rate in drops per minute?
Answers
The flow rate of the IV solution in drops per minute is 80 drops/min.
To determine the flow rate in drops per minute, we need to consider the conversion factors and relationships between different units.
First, let's convert the lidocaine dose from grams to milligrams, as the flow rate is given in milligrams per minute:
1 gram = 1000 milligrams
So, 1.0 gram of lidocaine is equal to 1000 milligrams.
Next, we can calculate the total volume of the IV solution in milliliters:
250 mL
To find the flow rate in milligrams per minute, we divide the dose by the total time:
Flow rate = Dose / Time
The dose is 1000 milligrams (1.0 gram) and the time is 1 minute.
Flow rate = 1000 mg / 1 min = 1000 mg/min
Now, to determine the flow rate in drops per minute, we need to convert the IV solution volume from milliliters to drops. Given that 20 drops = 1.0 mL, we can set up a conversion factor:
20 drops / 1 mL
To find the flow rate in drops per minute, we multiply the flow rate in milligrams per minute by the conversion factor:
Flow rate (drops/min) = Flow rate (mg/min) * Conversion factor
Flow rate (drops/min) = 1000 mg/min * (20 drops / 1 mL)
Now we need to convert milliliters to drops:
Flow rate (drops/min) = 1000 mg/min * (20 drops / 250 mL)
Simplifying the expression:
Flow rate (drops/min) = 1000 mg/min * (4/50)
Flow rate (drops/min) = 80 drops/min
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How does the chemical structure of a substance affect its interaction with other substances?
Answers
This is due to the fact that a substance's chemical qualities, such as its molecular form, polarity, and functional groups, govern how it behaves and interacts with other substances.
How does their chemical makeup impact their chemical characteristics?By illustrating the spatial arrangement of atoms and chemical bonds within the molecule, chemical structure establishes the molecular geometry of a compound. In doing so, chemists are given a crucial visual depiction of a chemical formula.
In what ways do drugs interact with one another?In a chemical reaction, reactants come into contact with one another, atoms in the reactants break their connections with one another, and then the atoms reorganise and form new bonds to create the products.
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2. for ammonia (nh3), the enthalpy of fusion is 5.65 kj/mol and the entropy of fusion is 28.9 j/k*mol. a. will nh3 (s) spontaneously melt at 150. k?
Answers
Since ΔG > 0, the process is non-spontaneous. Therefore, solid ammonia (NH3) will not spontaneously melt at 150 K.
To determine if solid ammonia (NH3) will spontaneously melt at 150 K, we can use the Gibbs free energy change (ΔG) equation:
ΔG = ΔH - TΔS
where ΔH is the enthalpy of fusion, T is the temperature in Kelvin, and ΔS is the entropy of fusion.
Given:
ΔH = 5.65 kJ/mol
ΔS = 28.9 J/K*mol
T = 150 K
First, convert ΔH to J/mol:
ΔH = 5.65 kJ/mol * 1000 J/kJ = 5650 J/mol
Now, substitute the values into the equation:
ΔG = 5650 J/mol - (150 K * 28.9 J/K*mol)
ΔG = 5650 J/mol - 4335 J/mol = 1315 J/mol
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What are 3 elements similar to silver
Answers
Answer:
Copper, Sodium, and Francium
Explanation:
Formula Writing Lab for Ionic Compounds Data Table
Answers
The table that can depict the compound is given below
Sodium +1 Na+ Chloride -1 Cl-
Potassium +1 K+ Oxide -2 O2-
Calcium +2 Ca2+ Nitride -3 N3-
Magnesium +2 Mg2+ Sulfide -2 S2-
What are ionic compound?Ionic compounds are the compounds made up of ions that form charged particles when an atom gains or loses electrons. A cation is an ion charged positively; an anion is an ion charged negatively.
In this table, the first column lists the names of the ions, the second column shows their corresponding charges, and the third column displays their ion formulas.
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PLEASE HELP FASTTT!!!!
Answers
Can you force the atoms into new configurations by pushing atoms around? What does this suggest
about the configuration of atoms in real molecules?
What is the difference between Electron Geometry and Molecule Geometry?
In one or two grammatically correct sentences, write a definition for the term Molecule Geometry.
Answers
Answer:
Yes
Explanation:
By forcing the atoms into a new configuration is possible.
The addition of new atoms around the atom will change the electronic geometry of the atoms. The addition of electron-accepting or donating atoms will result in a change in configuration. The configuration change will result in the change in the hybridization of the atom, and it will acquire a new shape. The geometry of the molecule changes and it will acquire the lowest energy state.
This suggests that atoms in real molecules are present in the flexible state of configuration, and are at least energy, The change in the surrounding changes the configuration of the atoms, and are easily configured.
Use the periodic table to select which type of bond is present and which of the listed properties is most likely for each substance.
A =
B =
Answers
Answer:
A = Metallic Bond
B = Strong bonding, strong conductor, high melting and boiling points
Explanation:
Since the bond is between two metals (located in groups 11 and 12), they would experience metallic bonding. Metallically bonded molecules have high melting and boiling points due to the strength of the metallic bond. They also experience strong electrical current due to the there delocalized electrons.
Answer:
A=metallic
B= conducts electricity as a solid
C=covalent
D=does not conduct electricity
Explanation:
got it correct on edge 2022
A student planned to make copper sulfate crystals from excess copper oxide and dilute sulfuric acid.
The equation for the reaction is:
CuO(s) + H,SO (aq) -, CuSO (aq) + H20(1)
This is the method used.
1. Add 25 cm° of dilute sulfuric acid to a conical flask.
2. Gently warm the dilute sulfuric acid.
3. Add excess copper oxide to the dilute sulfuric acid.
4. Stir the mixture.
5. Heat to evaporate all the water from the mixture.
Suggest two improvements to the method
Explain why each improvement is needed.
A student plans a method to prepare pure crystals of copper sulfate.
The student's method is:
1. Add one spatula of calcium carbonate to dilute hydrochloric acid in a beaker.
2. When the fizzing stops, heat the solution with a Bunsen burner until all the liquid is gone.
The method contains several errors and does not produce copper sulfate crystals.
Explain the improvements the student should make to the method so that pure crystals of copper sulfate are produced.
Answers
The student's method for preparing pure crystals of copper sulfate contains errors and does not produce the desired outcome.
Use copper oxide instead of calcium carbonate: The student should add copper oxide (CuO) to the hydrochloric acid instead of calcium carbonate. Copper oxide reacts with hydrochloric acid to form copper chloride, which can then be converted to copper sulfate through a subsequent reaction with sulfuric acid.
Add sulfuric acid to the copper chloride solution: After the copper chloride solution is formed, the student should add sulfuric acid to it. This reaction between copper chloride and sulfuric acid will yield copper sulfate and hydrochloric acid. The student should ensure that the correct stoichiometric ratio is maintained to maximize the yield of copper sulfate crystals.
Crystal formation: The student should allow the solution to cool slowly after the reaction with sulfuric acid. This promotes the formation of larger, well-defined copper sulfate crystals.
Filtration and drying: Once the crystals have formed, the student should filter the solution to separate the solid crystals from the remaining liquid. The filtered crystals should then be thoroughly dried to remove any remaining water, resulting in pure copper sulfate crystals.
By following these improvements, the student can obtain pure crystals of copper sulfate.
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convert 3.63 days into seconds
Answers
Answer: 313,632 seconds
Explanation:
The net force on a vehicle that is accelerating at a rate of 1.2 m/s2 is 1,500 newtons. What is
the mass of the vehicle to the nearest kilogram?
A)
18 kg
B)
180 Kg
C)
1,800 Kg
D)
1,250 Kg
Answers
The Force experienced on an object has a direct relationship with the acceleration.
The mass of the vehicle is 1250 kg
According to the first law of motion, a body will continue to be at rest or uniform motion unless acted upon by and external force
Given DataAcceleration a = 1.2 m/s^2
Force F = 1500N
Applying the Expression F = ma, and Substituting the given Data we have
1500 = m*1.2
Making mass the subject of formula and Solving for m
m = 1500/1.2
m = 1250 kg
Hence the mass of the vehicle is 1250 kg
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Answer:
Explanation: D 1,2500 Kg
A. Calculate the molarity of solution of "sodium sulfate" that contains 5.2 grams sodiums sulfate diluted to 500mL.
B. How many moles of sodium are in the solution
Answers
A. The molarity of solution containing 5.2 g of sodium sulphate is 0.0732 M
B. The number of mole of sodium in the solution is 0.0732 mole
How to determine the mole of sodium sulphate Na₂SO₄Mass of Na₂SO₄ = 5.2 gMolar mass of Na₂SO₄ = (23×2) + 32 + (16×4) = 142 g/mol Mole of Na₂SO₄ =?Mole = mass / molar mass
Mole of Na₂SO₄ = 5.2 / 142
Mole of Na₂SO₄ = 0.0366 mole
A. How to determine the molarity Mole of Na₂SO₄ = 0.0366 mole Volume = 500 mL = 500 / 1000 = 0.5 L Molarity =?Molarity = mole / Volume
Molarity = 0.0366 / 0.5
Molarity = 0.0732 M
B. How to determine the mole of sodium (Na)1 mole of Na₂SO₄ contains 2 moles of Na.
Therefore,
0.0366 mole of Na₂SO₄ will contain = 0.0366 × 2 = 0.0732 mole of Na
Thus, 0.0732 mole of Na is present in the solution.
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How many people died from pollution in 2007
Answers
Answer:
428,715
Explanation:
World figures say that around 428,000 people died of pollution in 2007.