1. Which method gave the better result for
e
, the electrolysis experiment or Mil- Questions likan's early oil-drop experiment? Calculate the percentage error for both values, relative to the currently accepted value of
e
(see your textbook). Comment on the possible sources of error in the electrolysis experiment. What do you think were the sources of error in Millikan's experiment? 2. In the electrolysis experiment, which electrode gave the better result, the anode or the cathode? Why is the result better at one electrode than at the other? 3. Why should the electrodes be kept in fixed relative positions during the electrolysis? Is it really necessary for them to be parallel? Evaluate and discuss your results for the second electrolysis. Was there any difference between the first and second electrolysis? Which was more accurate? From your observations, can you tell why?

Answer:

\(MgO _{(s)} + 2H {}^{ + } _{(aq)} = Mg {}^{2 + } _{(aq)}+ H _{2} O _{(l)} \\ \)

(a) here no is the initial amount and no = 8 we are told that the culture doubles every 1.5 hours. we can use the model given to us in part a to find the variable a.

16-8.2 1.5/a

16 2

8 21 1.5/a = 2

1 = 1.5

a = 1.5

so our exponential model is now (n(t) = 8.2 ±/1.5

(b) Number of bacteria after 26 hours:

n(t) = 8.2/1.5

put t = 26

26/1.5

n(t) = 8.2

n(t) = 8(165140-37) n(t) ≈ 1321123.

Calculate the number of bacteria per milliliter or gram of sample by multiplying the number of colonies by the dilution factor times the amount of sample added to the liquefied agar. The easiest way to measure bacterial growth is to place the sample on a clear glass plate under a microscope and count the number of bacterial cells.

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Atoms with the same number of protons but different masses (from different numbers of neutrons) are called: Isotopes

Isotopes:

An isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.

Elements with Different Atomic Masses:

Primarily there exists a total of three subatomic particles. Protons, neutrons and electrons. Protons and neutrons are inside the nucleus and much heavier than electrons. The atomic number of each element represents the number of protons of an atom of that element.

Reason :

Atoms that have the same number of protons but different numbers of neutrons are called isotopes.

The number of existing protons and electrons in a neutral atom of an element is equal. But, the atoms of an element may have a different number of neutrons. Since neutrons do not participate in an atom's chemical reactions, the chemical properties of all these different atoms of an element are the same.

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Reason:- The Mechanism of Diffusion In the case of food coloring in water, the water is the solvent while the food coloring is the solute. Once they've mixed, they make a solution. Diffusion takes time, though how much time depends on the kinetic energy of the molecules randomly bouncing among each other.

Answer:

It lets people prepare for future weather hazards:

- If, in certain months and on certain dates, the past data shows that there's a history of rain or heat stroke on those days, people can prepare in the future for those events.

- They can also expect wind speeds, temperatures and stuff like that!

Since we have been given the balanced reaction, we can just follow the stoichimetry of the reaction to calculate it.

By the stoichimetry, 1 mol of MnO₂ reacts with 4 moles of HCl. using Rule of three, we have:

1 mol MnO₂ --- 4 mol HCl

4.50 mol MnO₂ --- x

So, 18 moles of HCl will react with 4.5 moles od MnO₂ (assuming complete reaction).

0.0030

0.0030 is the equilibrium constant for the reaction at this temperature.

The reaction is as follows:

N2(g)+ 3 H2(g) ⇌ 2 NH3(g)

At equilibrium, the concentrations of the different species are as follows.:

[NH3] = 0.105 M

[N2] = 1.1 M

[H2] = 1.50 M

The equilibrium constant for the reaction is given as follows:

Keq = [NH3]² / [N2] [H2]³

Keq = (0.105)² / [1.1] [1.50]³

Keq = 0.00296 or 0.0030

The equilibrium constant for the reaction at this temperature is 0.0030.

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Answer:

the answer is A

0.0030

Explanation:

Answer:

A and B

Explanation: Dermal tissue functions to protect the plant from injury and water loss.

The probability that someone who has a positive test actually has the disease is approximately 24%.

The low probability that someone who tests positive actually has the disease despite the test's accuracy can be attributed to two factors: the rarity of the disease and the rate of false positives.

Firstly, let's consider the rarity of the disease, which is present in only 2% of the population. This means that even if the test is highly accurate, a positive result is more likely to be a false positive due to the larger proportion of healthy individuals in the population.

Secondly, we need to take into account the rate of false positives, which occurs in 6% of healthy individuals. When we combine this with the small percentage of the population actually having the disease, the number of false positives can outnumber true positives.

To understand this better, let's consider a hypothetical group of 1000 individuals. Out of these, only 20 (2%) would have the disease, while the remaining 980 (98%) would be healthy. The test's accuracy suggests that 19 out of the 20 individuals with the disease would test positive, and approximately 59 (6% of 980) healthy individuals would also test positive falsely.

Therefore, out of the total 78 positive test results (19 true positives + 59 false positives), only 19 (approximately 24%) would actually indicate the presence of the disease. This demonstrates why the probability of having the disease, given a positive test result, is relatively low.

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The correct option is b. at an angle; If a bullet passes through glass and leaves an oval-shaped hole, it entered the glass at an angle.

An oval resembles the form, contour, or shape of an egg.

For instance:

Thus, If a bullet passes through glass and leaves an oval-shaped hole, it entered the glass at an angle.

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Answer:

Explanation:

An element with atomic number 18 is a noble gas.

The element with atomic number 19 will have one extra electron so it can donate one electron or shed one electron to attain noble gas configuration .

It tends to shed one electron to become positively charged ion . Hence they are electro-positive elements .  

Similarly the element with atomic number 17 will have one short  electron so it can gain  one electron  to attain noble gas configuration .

They  tend to gain  one electron to become negatively charged ion . Hence they are electro-negative  elements . They have high  electronegativity .

The proportional dilution is the change in the concentration of solution without any fixed proportion ratio.

A dilution is give as the addition of the solvent to the solution in order to change the concentration of the solution.

The dilution can be given as serial dilution and proportional dilution. In serial dilution, the change in the concentration of the solution is made with the same proportion in the series.

The proportional dilution is given as the technique in which the change in the concentration of the solution in a series is not at a constant proportion.

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how are we (brainly users) supposed to know. unless its just me that doesn't know.

sorry that this isn't really much help. :/

Answer:

the answer is is C 465 grams

96.0 g of oxygen gas is consumed by the reaction of 46.068 g of ethanol.

The balanced chemical reaction that occurs when ethanol reacts with oxygen gas is:

C2H5OH + 3O2 → 2CO2 + 3H2O

The stoichiometric coefficient of O2 in the reaction is 3, meaning that for every 1 mole of ethanol (C2H5OH) consumed, 3 moles of O2 will be consumed.

The molecular mass of ethanol is 46.068 g/mol.

Therefore, the mass of oxygen gas consumed by the reaction of 1 mole of ethanol can be calculated as follows:1 mol of ethanol consumes 3 mol of O2.

Therefore, the mass of O2 consumed when 46.068 g of ethanol reacts will be:

mass of O2 = (3 mol O2 / 1 mol ethanol) x (32 g/mol O2)

= 96.0 g

So, 96.0 g of oxygen gas is consumed by the reaction of 46.068 g of ethanol.

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It's most likely that the circuit B is a series circuit while circuit A is a parallel circuit.

Circuits are basically two or more terminal components and electrical devices that is connected to each other. They can be connected in a series circuit or parallel circuit.

A series circuit is a circuit that connects its components using the same current flows. The current only has one path. Because of that, if one bulb fuses or removed, all the bulbs in the circuit won't light up.

A parallel circuit is a circuit that has multiple paths for the electric current to flow through. That makes the components have a constant voltage across all ends. Because of that, even if one bulb is removed, the other bulbs will stay lighted up.

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Answer: The vapor pressure of pure water at 100°C is 760mm of Hg.

Explanation: We know tat 100 degree Celsius the water will convert into gas phase.  At boiling point the vapor pressure of any liquid is 1 atmosphere and if we boil the water at 100° Celsius  it means 1 atmosphere . So, 1 atmosphere = 760mm of Hg.

To produce CO2 (g), the necessary chemicals are a carbonate (such as sodium bicarbonate or calcium carbonate) and an acid (such as vinegar or hydrochloric acid). The net ionic equation would be: H+ (aq) + CO32- (aq) → CO2 (g) + H2O (l) or 2H+ (aq) + CO32- (aq) → CO2 (g) + H2O (l)

Based on your lab procedure, the necessary chemicals to produce CO2 (g) are typically a carbonate or bicarbonate salt, such as sodium carbonate (Na2CO3) or sodium bicarbonate (NaHCO3), and an acid, such as hydrochloric acid (HCl).

The net ionic equation for the generation of CO2 (g) using sodium bicarbonate (NaHCO3) and hydrochloric acid (HCl) is as follows:

HCO3- (aq) + H+ (aq) → CO2 (g) + H2O (l)

This equation represents the reaction between bicarbonate ions and hydrogen ions to produce carbon dioxide gas and water.

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Given the following choices, determine which best suits as a characteristic of a hurricane.

Answer Choices:

A. Hurricanes occur mostly inland

B. Hurricanes create widespread damage

C. Hurricanes can only last for a short amount of time

D. Hurricanes gain strength after passing overland

Best Answer: B. Hurricanes can create widespread damage.

Reason: A would not be correct since it is more of a variable, due to the fact that hurricanes usually begin near the coastlines, hurricanes are in fact capable of moving inland for atleast 100 miles before it dies down to a tropical storm or depression.

C is not correct since hurricanes can last up to a whole week which is approximately 168 hours.

D is not correct since it is another variable in which hurricanes can decrease in strength if it comes into contact with cool and dry air which is the opposite of warm and moist which it needs in order to occur.

Therefore, the best choice is B. Hurricanes can create widespread damage, hurricanes can unleash a staggering arsenal of mother nature's strength and the most damage a hurricane has caused can go up to 125 billion USD in damages.

One characteristic of hurricanes is that it: B. create widespread damage.

A natural disaster can be defined as a major adverse event that is caused by the forces of nature on planet Earth. Some examples of a natural disaster include the following:

Hurricane can be defined as an extremely large, powerful, violent storm that typically leads to the destruction of life and properties on both land and water.

In conclusion, a characteristic of hurricanes is that it is capable of creating widespread damage on planet Earth.

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Answer:

first one

Explanation:

The transition metals iron (Fe), cobalt (Co), and nickel (Ni) are paramagnetic and can easily form ferromagnetic alloys with other metals. Here options A, B, and C are the correct answer.

Transition metals are a group of elements that are characterized by their partially filled d-orbitals. Some of these elements exhibit magnetic properties, including paramagnetism and ferromagnetism. Paramagnetic materials are attracted to an external magnetic field, while ferromagnetic materials exhibit strong magnetic properties even in the absence of an external field.

Among the transition metals, iron (Fe), cobalt (Co), and nickel (Ni) are known to be paramagnetic and can easily form ferromagnetic alloys with other metals. These three elements are often referred to as the "iron group" and are known for their strong magnetic properties.

Iron, in particular, is commonly used in the production of ferromagnetic alloys, such as steel. The addition of small amounts of iron to other metals can dramatically increase their magnetic properties, making them useful in a wide range of applications, including electronics and data storage.

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Complete question:

Which of the following transition metals are paramagnetic and can readily form ferromagnetic alloys with other metals?

A) Iron (Fe)

B) Cobalt (Co)

C) Nickel (Ni)

D) Copper (Cu)

Answer:

Stellar nucleosynthesis

Explanation:

Answer:

Iodine is a mineral found in some foods. The body must have iodine to make thyroid hormones. The hormones control the body's metabolism and many other important functions. Without iodine, thyroid hormone production can decrease.

Explanation:

Decreasing the TBCl concentration will not affect the rate constant in this experiment. The rate constant is determined by the specific reaction and temperature conditions and is independent of the reactant concentrations.

The rate constant (k) is a proportionality constant that relates the rate of a reaction to the concentrations of the reactants. However, the rate constant itself is not affected by the concentrations of the reactants. It is determined by the specific reaction and temperature conditions.

The rate of a chemical reaction can be expressed using the rate equation, which typically includes the concentration terms for the reactants raised to certain powers.

These powers, known as reaction orders, can be determined experimentally. However, the rate constant is a separate factor in the rate equation and is not dependent on the reactant concentrations.

By decreasing the TBCl concentration, the rate of the reaction may be affected, as the rate is directly proportional to the reactant concentrations.

However, the rate constant itself remains unchanged. The rate constant is influenced by factors such as temperature, presence of catalysts, and the nature of the reacting species, but not by the concentrations of the reactants.

Therefore, decreasing the TBCl concentration will not affect the rate constant in this experiment.

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Answer:

If you could look down into the flame, you'd see that oxygen molecules from the air interact with wax molecules and have a chemical reaction. And the products of the reaction, that means the stuff that's produced, is water vapor, carbon dioxide gas, and heat, and light.

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A central atom can be surrounded by five or six electron groups if there are enough orbitals available for bonding. Specifically, the appropriate number of equivalent bonding orbitals is formed by combining one s orbital, three p orbitals, and one or two d orbitals. These orbitals come together to form a set of five or six hybrid orbitals that are capable of bonding with other atoms.

The process of forming these hybrid orbitals is known as hybridization. During hybridization, the atomic orbitals of the central atom are combined in a way that minimizes their energy and maximizes their bonding potential.

This results in the formation of new, hybrid orbitals that are more stable and better suited for bonding with other atoms.
The number and type of orbitals that are involved in hybridization depend on the geometry of the molecule.

For example, if the molecule has a trigonal bipyramidal geometry, the central atom will use one s orbital, three p orbitals, and two d orbitals to form five equivalent hybrid orbitals.

If the molecule has an octahedral geometry, the central atom will use one s orbital, three p orbitals, and two d orbitals to form six equivalent hybrid orbitals.
Overall, the availability of enough orbitals for bonding is critical for the formation of stable molecules.

Hybridization plays a key role in allowing central atoms to form the appropriate number of equivalent bonding orbitals for their specific geometry, enabling them to bond with other atoms and form stable chemical compounds.

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