In 1939, 740 migrant ship passengers were turned away from which city port, despite having immigration papers?
A. Barcelona
B. Miami
C. Berlin
D. London

Answer:

NADH is formed

Explanation:

If oxygen exists in the system, pyruvate goes into mitochondrial matrix in order to perform kreb's cycle and forms NADH

Otherwise, pyruvate forms into lactate acid.

Good luck on your final exam

Answer:

The bond-dissociation energy is one measure of the strength of a chemical bond A−B. It can be defined as the standard enthalpy change when A−B is cleaved by homolysis to give fragments A and B, which are usually radical species

Answer:In order to be able to calculate the volume of oxygen gas produced by this reaction, you need to know the conditions for pressure and temperature.

Since no mention of those conditions was made, I'll assume that the reaction takes place at STP, Standard Temperature and Pressure.

STP conditions are defined as a pressure of

100 kPa

and a temperature of

0

∘

C

. Under these conditions for pressure and temperature, one mole of any ideal gas occupies

22.7 L

- this is known as the molar volume of a gas at STP.

So, in order to find the volume of oxygen gas at STP, you need to know how many moles of oxygen are produced by this reaction.

The balanced chemical equation for this decomposition reaction looks like this

2

KClO

3(s]

heat

×

−−−→

2

KCl

(s]

+

3

O

2(g]

↑

⏐

⏐

Notice that you have a

2

:

3

mole ratio between potassium chlorate and oxygen gas.

This tells you that the reaction will always produce

3

2

times more moles of oxygen gas than the number of moles of potassium chlorate that underwent decomposition.

Use potassium chlorate's molar mass to determine how many moles you have in that

231-g

sample

231

g

⋅

1 mole KClO

3

122.55

g

=

1.885 moles KClO

3

Use the aforementioned mole ratio to determine how many moles of oxygen would be produced from this many moles of potassium chlorate

1.885

moles KClO

3

⋅

3

moles O

2

2

moles KClO

3

=

2.8275 moles O

2

So, what volume would this many moles occupy at STP?

2.8275

moles

⋅

22.7 L

1

mol

=

64.2 L

Explanation:

Answer:

metallic bonding

Explanation:

Copper wire consists of Cu nuclei (that are positively charged due to the positively charged protons) that are surrounded by a "sea" of delocalized electrons (that are negatively charged that move freely throughout the material which is known as metallic bonding.

Answer:

Metallic bonding.

Explanation:

Pure copper is neither covalent nor ironic. It is a bonding called metallic bonding.

We will start finding the molar mass of CuO. If we look at the the periodic table we will find the atomic masses of the elements of our compound.

Cu = 63.55 amu

O = 16.00 amu

Cu1O has one atom of Cu and one atom of O. So the molar mass is:

molar mass of Cu1O = atomic mass of Cu * 1 + atomic mass of O * 1

molar mass of Cu1O = 63.55 + 16.00

molar mass of Cu1O = 79.55 g/mol

Now that we know that the mass of one mol of Cu1O is 79.55 g, we can find the number of moles that we have in the sample. The sample has a mass of 660.12 g.

number of moles of Cu1O = mass of the sample / molar mass of Cu1O

number of moles of Cu1O = 660.12 g / (79.55 g/mol)

number of moles of Cu1O = 8.2982 moles

I have 8.2982 moles of Cu1O in the sample.

The dark processes, a complicated series of enzymatically controlled chemical reactions, are what turn carbon into organic molecules. This word is rather misleading because these responses can occur in both light and darkness. As a result of extended darkness, some of the enzymes involved in the so-called dark processes become dormant; nevertheless, when the leaves that contain them are exposed to light, they become active.

The synthesis of intermediate sugar phosphates occurs in a cyclic process during the Calvin-Benson cycle, which involves the fixation, reduction, and use of carbon. Three molecules of carbon dioxide are used in a full cycle, which results in the production of one molecule of the three-carbon chemical glyceraldehyde-3-phosphate (Gal3P). Typically, the chloroplasts either export this three-carbon sugar phosphate or convert it to starch the chloroplast's inside.

The process of adding carbon dioxide to the five-carbon compound ribulose 1,5-bisphosphate (RuBP) and splitting the resulting six-carbon compound into two molecules of PGA is known as the initial incorporation of carbon dioxide, which is catalyzed by the enzyme ribulose 1,5-bisphosphate carboxylase (Rubisco). Each full turn of the cycle sees this reaction take place three times, resulting in the production of six PGA molecules.

Answer:

hedges are used to be courteous in expressing (counterclaims)

We can find the volume of the solution using the formula of molarity:

We have already the molarity (0.0550 M (mol/L) ) and the number of moles (0.163 moles). Clearing the formula for liters and replacing the data that we have, we're going to obtain:

The answer is that we have 2.96 liters in a 0.0550 M of LiBr solution with 0.163 moles.

N2O4(g) should have the greatest molar entropy at 298 K. So option C is correct

The molar entropy is a measure of the amount of thermal energy in a substance that is unavailable for doing useful work. It is related to the number of available energy states, or microstates, that a substance can occupy.

At a given temperature, N2O4(g) has more microstates available compared to CH4(g), H2O(l), H2(g), and NaCl(s) due to its molecular complexity and a high degree of molecular motion.

This results in N2O4(g) having a higher molar entropy at 298 K compared to the other substances.

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84 oz of 2% acid solution and 48-84 = -36 oz of 10% acid solution must be mixed to make 48 oz of a 7% acid solution.

An acid solution is described as a liquid mixture that occurs when hydrogen ions are released when combined with water.

We have that  x oz of 2% acid solution be mixed with (48-x) oz of 10% acid solution.

The total amount of acid in the 2% solution is 2% * x oz = 0.02x oz.

The total amount of acid in the 10% solution is 10% * (48-x) oz = 1 * (48-x) oz.

The total amount of acid in the 48 oz mixture is 0.02x oz + 1 * (48-x) oz = 0.07 * 48 oz = 3.36 oz.

Hence we can calculate that :

0.02x + 1 * (48-x) = 3.36 and solve for x

0.02x + 48 - x = 3.36

0.02x - x + 48 = 3.36

Adding x to both sides:

0.02x + 48 = 3.36 + x

Subtracting x from both sides:

0.02x + 48 - x = 3.36

Dividing both sides by 0.02:

x = 84 oz

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If I pipet 50.00 ml of 5.026 x 10⁻³ M solution into a 250ml volumetric flask. The concentration of the new solution is 1.0052 x 10⁻³ M.

The amount of solute contained in a specific amount of solution is the substance's concentration. Concentration in chemistry is calculated by dividing a constituent's abundance by the mixture's total volume.

The number of moles of solute in 1 L of solution, or molarity, is used to express concentrations. The concentration of any solute per unit volume of the solution is measured by molarity.

Molarity = number of moles / volume

Given that the volume is 250ml

The molarity of the pipet is 5.026 x 10⁻³

50 x 5.026 x 10⁻³ = 250 x C

C = 1.0052 x 10⁻³ M

Therefore, the concentration of the new solution is 1.0052 x 10⁻³ M.

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Answer:

Energy levels

Explanation:

Elements in one row of the periodic table have the same energy levels. A row on the periodic table is the horizontal arrangement of elements. These rows are called periods.

There are 7 periods on the periodic table.

It is the 4th scenario is the dependent event. There are 7 gold tokens and 4 silver tokens in a cup. The first student randomly draws a gold token and keeps it. A second student randomly draws a gold token from the cup.

The fouth scenario is a dependent event because the probability of the second student drawing a gold token is affected by the outcome of the first student's draw.

If the first student draws a gold token, then there are only 6 gold tokens left in the cup, the probability changes. but  if the first student does not draw a gold token, then there are 7 gold tokens left in the cup, the probability will remain the same

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The Specific Rate Constant of the reaction  X + 2Y + 3Z → 2L + 4T is 0.25. By using rate law for the above reaction is R = K [Y]² [Z].

The proportionality constant in the equation that defines the link between the rate of a chemical reaction and the concentrations of the reacting chemicals is known as the rate constant, also known as the Specific Rate constant.

From Given Table of Experiments :

Experiment 1

         R = K [Y]² [Z]

1 × 10⁻⁴ = K [0.2]² [0.01]

        K = 1 × 10⁻⁴ / [0.04] [0.01]

        K = 1 ×  10⁻⁴ /  4 × 10⁻⁴

        K = 1 / 4

        K = 0.25

Experiment 2

         R = K [Y]² [Z]

9 × 10⁻⁴ = K [0.6]² [0.01]

        K = 9 × 10⁻⁴ / [0.36] [0.01]

        K = 9 ×  10⁻⁴ / 36 × 10⁻⁴

        K = 9 / 36

        K = 0.25

Experiment 3

         R = K [Y]² [Z]

9 × 10⁻⁴ = K [0.6]² [0.01]

        K = 9 × 10⁻⁴ / [0.36] [0.01]

        K = 9 ×  10⁻⁴ / 36 × 10⁻⁴

        K = 9 / 36

        K = 0.25

Experiment 4

        R = K [Y]² [Z]

36 × 10⁻⁴ = K [0.6]² [0.04]

        K = 36 × 10⁻⁴ / [0.36] [0.04]

        K = 36 ×  10⁻⁴ /  × 10⁻⁴

        K = 36 / 144

        K = 0.25

Therefore, The correct option is (D) 0.25.

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The companies must carefully weigh the advantages and disadvantages before making the decision to go public.

One advantage for a company that goes public is B. Money is raised without going into debt. When a company decides to go public through an initial public offering (IPO), it offers its shares to the public, allowing investors to buy a stake in the company. This process provides a significant opportunity for the company to raise capital without incurring debt.

By going public, a company can generate substantial funds by selling shares to investors who believe in the company's potential. These funds can be used to finance various business activities such as research and development, expansion into new markets, acquisitions, or improving infrastructure. Unlike borrowing money through loans or issuing bonds, going public does not create a debt burden for the company.

Furthermore, by raising capital without taking on debt, the company avoids the associated interest payments and repayment obligations. This can contribute to improved financial flexibility and reduced financial risk in the long run. Additionally, the company's creditworthiness is not affected, allowing it to maintain good relationships with lenders and potentially secure favorable loan terms if necessary.

However, it is important to note that going public also has potential drawbacks, such as increased regulatory requirements, heightened public scrutiny, and dilution of ownership.

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Answer:

Not sure if I'm correct, but I think it's 200.59 u

Answer:

The answer is 200.59 u

Explanation:

Mercury has a mass of 3.3 x 1023kilograms. This mass is contained in a volume of 14.6 billion cubic miles (60.8 billion cubic km). The mass and volume of Mercury is only about 0.055 times that of Earth

Answer:

Atomic element

Explanation:

Carbon is considered an atomic element. Therefore, the correct option is option A among all the given options.

Chemical element carbon has the atomic number six and the letter C assigned to it. It has a tetravalent atom, which means that four of its electrons may be used to create covalent chemical connections. It is nonmetallic. The periodic table's group 14 includes it. The crust of the Earth contains 0.025 percent carbon. There are several ways in which the carbon atoms can connect, giving rise to different allotropes of carbon. Amorphous carbon, diamond, graphite, and fullerenes are examples of well-known allotropes. Carbon is considered an atomic element.

Therefore, the correct option is option A among all the given options.

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Answer:

Before the equivalence point, conductivity is decreasing. After the equivalence point, conductivity is increasing

Explanation:

In solution H2SO3 produce H+ ions and SO3²⁻ ions. In the same way, NaOH produce Na⁺ and OH⁻ ions. The conductivity of a solution is directly proportional to the concentration of ions in a solution. During titration, you are adding more NaOH (That is, more Na⁺ and OH⁻ ions). But each moles of OH⁻ reacts with H⁺ ion producing H₂O. That means the moles of Na⁺ that you are adding = Moles of H⁺ are been consumed. The concentration of ions remains approximately constant. But, H⁺ ion conducts better than Na⁺ ion. That means before the equivalence point, conductivity is decreasing. But after the equivalence point you will add OH- ions in excess increasing ion concentration increasing the conductivity:

After equivalence point, conductivity is increasing.

Considering the definition of molar mass, the correct answer is option c): the mass of 1.85 moles H₂O₂ is 62.9 grams.

The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.

The molar mass of a compound is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

In this case, you know the molar mass of the elements is:

So, the molar mass of the compound H₂O₂ is calculated as:

H₂O₂= 2× 1 g/mole + 2× 16 g/mole

Solving:

H₂O₂= 34 g/mole

You can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 34 grams, 1.85 moles of the compound contains how much mass?

mass= (1.85 moles× 34 grams)÷ 1 mole

mass= 62.9 grams

Finally, the mass of 1.85 moles H₂O₂ is 62.9 grams.

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Answer: 20.9 billion years.

Explanation: To estimate the age of the rock, we can use the fact that the half-life of uranium-238 is 4.47 billion years. This means that half of the uranium-238 in the rock would have decayed into lead-206 after 4.47 billion years, and half of what remains would decay in the next 4.47 billion years, and so on.

If 20% of the uranium-238 in the rock has decayed into lead-206, then 80% of the original uranium-238 is still present in the rock. This means that the rock has gone through one half-life of uranium-238 decay, and we can estimate its age by using the graph on page 253.

According to the graph, the ratio of lead-206 to uranium-238 after one half-life is approximately 0.027. This means that the rock contains 0.027 times as much uranium-238 as it did originally, and the remaining 80% of the uranium-238 corresponds to 0.8 times the original amount.

Therefore, we can estimate the original amount of uranium-238 in the rock as follows:

Original amount of uranium-238 = (0.8) / 0.027 = 29.63 times the current amount

Next, we can use the fact that each half-life corresponds to a reduction in the amount of uranium-238 by a factor of 2, to estimate the number of half-lives that have passed since the rock formed:

Number of half-lives = log2(29.63) = 4.88

Finally, we can estimate the age of the rock as follows:

Age of the rock = (4.88) x (4.47 billion years per half-life) = 20.9 billion years

Therefore, we can estimate that the age of the rock is approximately 20.9 billion years.

Answer:

1) As the temperature increased what happened to the N2O4 concentration, it decreased

2) Formation of products, products are the right hand side of the equation.

3) Right to left is exothermic

4) Change in enthalpy N2O4 ⇔2NO2, HR = -14 kcal

As it's an exothermic reaction, the enthalpy of the reactants is higher than the products and the sign of the HR will be negative.

Explanation:

N2O4 ⇔2NO2

(colorless) (reddish-brown)

1) As the temperature increased what happened to the N2O4 concentration, it decreased

2) Formation of products, products are the right hand side of the equation.

3) Right to left is exothermic

4) Change in enthalpy N2O4 ⇔2NO2, HR = -14 kcal

As it's an exothermic reaction, the enthalpy of the reactants is higher than the products and the sign of the HR will be negative.

Answer:

The number of molecules of water us 1.50× 10²⁵ molecules

Explanation:

From N=nL

where L =avogadro number ( 6.02× 10^²³ entities)

The number of the molecules of water =1

n (amount of substance)=25 moles

hence (N) = 25×1×6.02×10^²³

=1.50×10²⁵ molecules of H2O

Answer:

B. habitat

Explanation:

got it right on my test hope this helps:)

Answer:

It's habitat.

Explanation:

I took the Module 3 Exam and got it right.

Based on the reactivity of the metals:

The ability of metals to displace hydrogen from dilute acids depends on the reactivity of the metal.

Reactive metals such as zinc and magnesium which occur higher than hydrogen in the activity series of metals will displace hydrogen from dilute acids such as dilute hydrochloric acid.

Copper cannot displace hydrogen from acids because it is less reactive than hydrogen.

The rate of reaction increases with increase in concentration of the acid.

Therefore, no reaction occurs for the copper strips in test tubes 3 and 6.

Hydrogen is displaced by the magnesium strips in test tubes 1 and 4, with the reaction more vigorous in the acid of higher concentration.

Hydrogen is displaced by the zinc strips in test tubes 2 and 5, with the reaction more vigorous in the acid of higher concentration.

In conclusion, reactive metals such as magnesium and zinc displace hydrogen from acids while a less reactive metal such as copper do not.

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Answer:

That would be True

Explanation:

granite is a part of the crust layer.

1. The pKa of the unknown acid is equal to the pH measured at 25.40 mL, which is 3.86.

2. The Ka of the unknown acid is 1.39 x \(10^{-4}\).

To calculate the Ka of the unknown acid, we can use the Henderson-Hasselbalch equation:

\(pH = pKa + log([A^-]/[HA])\)

At the equivalence point, \([A^-] = [HA]\), so we can simplify the equation to:

pH = pKa + log(1)

which means that pH = pKa.

Therefore, the pKa of the unknown acid is equal to the pH measured at 25.40 mL, which is 3.86.

To calculate the Ka of the unknown acid, we can use the relationship between Ka and pKa:

Ka = \(10^{-pKa}\)

We already know the pH and pKa values, so we can solve for Ka:

Ka =\(10^{-pKa}\) = \(10^{-3.86}\) = 1.39 x \(10^{-4}\).

Therefore, the Ka of the unknown acid is 1.39 x \(10^{-4}\).

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Most elements occur in compounds combined with other elements by forming chemical bonds, which are formed by the interaction of the electrons of the atoms involved.

Chemical bonds are forces that hold atoms together to form molecules. There are several types of chemical bonds, including covalent bonds, ionic bonds, and metallic bonds, among others. The type of bond formed between two or more atoms depends on the electronegativity of the atoms involved and the nature of the interaction between their electrons.

In covalent bonds, atoms share electrons to form a shared electron pair and form a covalent bond. Covalent bonds are usually formed between atoms with similar electronegativities, and the bond is strongest when the electrons are shared equally between the atoms.

Ionic bonds, on the other hand, are formed when one atom donates an electron to another atom to form ions. Ionic bonds are typically formed between atoms with significantly different electronegativities, and the bond is strong because of the strong attraction between the positively charged ion and the negatively charged ion.

Metallic bonds are formed between metal atoms and involve the sharing of electrons between metal atoms to form a metallic lattice structure. The electrons in metallic bonds are delocalized, which means they are not associated with a single atom but are shared by all the metal atoms in the lattice.

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