Round the following numbers to 3 significant figures.
13.
8,448
14. 89.32
15.
0.05678

The rock layers are described as follows:

Igneous rocks: These rocks form when molten rock (magma or lava) cools and solidifies. They can be either intrusive, meaning that they formed below the earth's surface, or extrusive, meaning that they formed above the earth's surface. Examples of igneous rocks include granite, basalt, and obsidian.

Note that in the above case, It looks like this table is describing the relative ages and characteristics of different rock layers. The oldest rock layer is at the bottom and the youngest rock layer is at the top.

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Answer:

isopropyl alcohol

Explanation:

HOPE IT HELPS YOU

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

The electronic transition that would result in the emission of a photon with the highest energy for a hydrogen atom is the transition from the third energy level (n=3) to the first energy level (n=1).

This transition is also known as the Lyman-alpha transition and corresponds to an ultraviolet photon with a wavelength of 121.6 nm. At this energy level, the electron is transitioning from a higher energy level to a lower energy level, resulting in the emission of energy in the form of a photon. The energy of the photon is directly proportional to the frequency and inversely proportional to the wavelength of the emitted radiation.

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The acceleration of the tornado is obtained as 3 miles/hr^2.

We know that we can be able to obtain the acceleration by looking at the equations of motion. Let us note that using the equations of motion as we have it we should consider the use of the equation;

v = u + at

v = final velocity

u = initial velocity

t = time taken

a = acceleration

Where we have;

t = 5 hours

v = 25 miles/hour

u =  10 miles/hour

Then;

a = v - u/t

a = 25 - 10/5

= 3 miles/hr^2

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When 10.1 moles of S8 reacts with excess oxygen, 214.13 moles of Al2S3 will be produced.

When 10.1 moles of S8 reacts with excess oxygen, it will produce sulfur dioxide (SO2) as the product. The balanced chemical equation for this reaction is given as below:  S8 + 8O2 ⟶ 8SO2Thus, the number of moles of SO2 produced can be calculated as follows: 10.1 moles of S8 × 8 mol SO2/1 mol S8 = 80.8 moles of SO2This means that 80.8 moles of SO2 will be produced when 10.1 moles of S8 react with excess oxygen. Now, we can calculate the number of moles of Al2S3 produced using the following balanced chemical equation:  8Al + 3S8 ⟶ 8Al2S3Here, we can see that 3 moles of S8 produces 8 moles of Al2S3. Therefore, we can use the mole ratio to calculate the number of moles of Al2S3 produced from the 80.8 moles of SO2 obtained earlier. Number of moles of Al2S3 = 80.8 moles of SO2 × 8 mol Al2S3/3 mol S8 = 214.13 moles of Al2S3.

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Answer:

1

Explanation: bases do not react with metals or carbonates

Answer:

A

Explanation:

I did the test and that's the correct answer

That oil sands executive is greedy and heartless and therefore can't be trusted when she claims is Ad hominem attack. So, Option B is correct.

4-  The argument in question 4 is an example of an ad hominem attack. This is due to the argument's focus on the character of the oil sands executuive rather than the actual problem, which is how to improve the company's environmental record.

The argument holds that the executive cannot be believed when she says she wants to improve the company's environmental record because she is avaricious and callous. This is an error in logic, though, as the executive's character may not necessarily be related to the company's environmental policies.

5-  The argument in question 5 is an example of an appeal to ignorance. This is because the argument states that there is no proof that humans are causing climate change, so it must be natural causes. Just because there is no conclusive proof that humans are causing climate change, it does not mean that they are not.

The argument assumes that just because there is no evidence to the contrary, the argument must be true. This is a logical fallacy.

So, Option B is correct.

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Answer/Explanation:

A) The independent(test) variable controls the dependent variable. A good way to think about this is that the independent variable has nothing that effects itself. The dependent variable is 'dependent' or reliant on the independent variable.

Answer:

A

Explanation:

Approximately 12.45 grams of solid silver chromate will precipitate when 150 mL of 0.500 M silver nitrate solution is added to excess potassium chromate.

To determine the number of moles of AgNO3 present in 150 mL of a 0.500 M AgNO3 solution, we can use the formula:

moles = concentration × volume

Given:

Concentration of AgNO3 solution = 0.500 M

Volume of AgNO3 solution = 150 mL

First, we need to convert the volume from milliliters (mL) to liters (L) since the concentration is given in moles per liter (M).

1 L = 1000 mL

Therefore, the volume of the AgNO3 solution in liters is:

150 mL × (1 L / 1000 mL) = 0.150 L

Now we can calculate the moles of AgNO3 using the formula:

moles = concentration × volume

moles = 0.500 M × 0.150 L

moles = 0.075 mol

So, there are 0.075 moles of AgNO3 present in 150 mL of the 0.500 M AgNO3 solution.

Now, let's proceed to determine how many grams of solid silver chromate (Ag2CrO4) will precipitate when the AgNO3 solution reacts with excess potassium chromate (K2CrO4).

From the balanced chemical equation:

2AgNO3(aq) + K2CrO4(aq) → Ag2CrO4(s) + 2KNO3(aq)

We can see that the molar ratio between AgNO3 and Ag2CrO4 is 2:1. Therefore, for every 2 moles of AgNO3, we will form 1 mole of Ag2CrO4.

Since we have 0.075 moles of AgNO3, we can calculate the moles of Ag2CrO4 formed:

moles of Ag2CrO4 = 0.075 mol / 2 = 0.0375 mol

To determine the mass of Ag2CrO4, we need to multiply the moles by its molar mass. The molar mass of Ag2CrO4 is calculated by summing the atomic masses of each element in the compound:

Ag2CrO4 = 2(Ag) + 1(Cr) + 4(O) = 2(107.87 g/mol) + 1(52.00 g/mol) + 4(16.00 g/mol) = 331.87 g/mol

mass of Ag2CrO4 = moles of Ag2CrO4 × molar mass of Ag2CrO4

mass of Ag2CrO4 = 0.0375 mol × 331.87 g/mol = 12.45 g

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Answer:

the metal gets cold and week

Explanation:

Three phases made up Hershey and Chase's experiment: infecting, mixing, centrifugation .

An infection occurs when a germ damages a person after entering their body.The bacterium reproduces and establishes a colony These pathogenic tiny organisms are contagious and reproduce swiftly. Pathogens include, for instance, bacteria.

An infection happens when germs get into the body, grow there, and then start the body reacting .Three things must happen for an infection to occur: Source: Infectious (germ) agent habitats (e.g., sinks, surfaces, human skin) a vulnerable individual who serves as a germ entrance point.

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The balanced chemical reaction between lithium and nitrogen is;

6Li(s) + N₂(g) → 2Li₃N(s)

From the equation above, we can deduce that; 6 moles of lithium reacts with 1 mole of nitrogen gas. The molar volume of a gas at STP is 22.4 L/mol.

Therefore, at STP, 1 mole of a gas occupies a volume of 22.4 L.

So, 55.2 mL of nitrogen gas at STP is;

55.2/1000 = 0.0552 Liters.

Number of moles of nitrogen gas = volume of gas at STP/STP volume per mole of gas:

0.0552/22.4 = 2.46 × 10⁻³ moles.

Lithium required to react completely with the nitrogen gas:

6 × (2.46 × 10⁻³) = 0.0148 g (approx. 0.015 g).

Therefore, the mass of lithium required to react completely with 55.2 mL of N₂ gas at STP is approximately 0.015 g.

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The pH of the solution is 9.92,  The pH of a solution involves calculating the concentration of hydrogen ions in the solution

Sr(OH)2 (s) → Sr2+ (aq) + 2 OH- (aq)The next step is to calculate the concentration of hydroxide ions in the solution using the stoichiometry of the balanced equation. We are given that 1.03×10−6 moles of Sr(OH)2 are dissolved in 25.0 mL of solution, so we can use the following equation to calculate the concentration of hydroxide ions:[OH-] = 2 × (1.03×10−6 mol)/(0.0250 L) = 8.24×10−5 M

Finally, we can use the relationship between the concentration of hydroxide ions and the concentration of hydrogen ions in water to calculate the pH of the solution:pOH = -log[OH-] = -log(8.24×10−5) = 4.08pH = 14 - pOH = 14 - 4.08 = 9.92

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According to the label the true statement about the following substance is option c. It does not pose a health risk

Specially designed labels with particularly specialised adhesive qualities are called "lab labels." In the pharmaceutical or medical industry, as well as in laboratories, they are used for labelling. For the labelling of tubes, test tubes, blood bags, and other types of vessels, special laboratory labels are created.

Labels on chemicals

The identify of the hazardous chemical(s) in the container (for example, chemical name) and the dangers present must both be listed on this label. This warning about hazards can be distributed in a variety of ways. Employers want to choose a solution that will function in each place.

The following label indicates that the chemical does not pose a health risk.

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Norman sliding his foot across the floor would create heat energy through friction (C)

When a person is sliding on the floor, the foot would rub against the floor. The process would result in friction between the feet and the floor.

In addition to that, the potential energy (resting energy) is getting converted to kinetic energy (energy resulting from motion). The difference between the energy of an object at resting state and motion would result in production of heat energy. This is caused mainly due to friction.

Thus, when Norman’s foot is sliding across the floor, it would create heat energy through friction.

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The hydroxylamine have a Kb of 1.64 x 10⁻⁹.

The H+ ion concentration's negative logarithm is known as pH. As a result, the meaning of pH is justified as the strength of hydrogen.

The first step in solving this problem is to write the chemical equation for the ionization of hydroxylamine in water:

NH₂OH + H₂O ⇌ NH₃OH⁺ + OH⁻

The base dissociation constant expression for this reaction is:

Kb = [NH₃OH⁺][OH⁻] / [NH₂OH]

We can use the pH value and the fact that [H⁺] x [OH⁻] = 1.0 x 10⁻¹⁴ at 25°C to find [OH⁻]:

pH = -log[H⁺]

9.792 = -log[H⁺]

[H+] = 10⁻⁹ = 1.25 x 10⁻¹⁰ M

[OH-] = 1.0 x 10⁻¹⁴ / [H+] = 8.0 x 10⁻⁵ M

Now we need to find the concentration of NH₂OH:

0.393 m = 0.393 mol / (1000 g) x (1000 mL) = 0.393 mol / 1000 mL = 0.393 M

Substituting the values for [NH₂OH] and [OH⁻] into the Kb expression gives:

Kb = [NH₃OH⁺][OH⁻] / [NH₂OH] = (x)(8.0 x 10⁻⁵) / (0.393 - x)

Assuming that x is negligible compared to 0.393, we can simplify this expression to:

Kb ≈ (x)(8.0 x 10⁻⁵) / 0.393

Next, we need to find x, the concentration of NH₃OH⁺. We can use the fact that at equilibrium, the concentration of NH₃OH⁺ is equal to the concentration of OH⁻:

x = [NH₃OH⁺] = [OH⁻] = 8.0 x 10⁻⁵ M

Finally, we can substitute this value of x into the simplified Kb expression:

Kb ≈ (8.0 x 10⁻⁵)(8.0 x 10⁻⁵) / 0.393 = 1.64 x 10⁻⁹

Therefore, the Kb for hydroxylamine is 1.64 x 10⁻⁹.

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Answer:

I'm assuming this is from a lab that you did - in which case, I can't really help you out here.

Explanation:

Answer: It's the circulatory system

Explanation:

Answer:

The identity of the element can be determined by comparing the atomic masses of the known isotopes with the atomic masses of the elements listed in the answer choices.

The weighted average atomic mass of the element can be calculated as follows:

(0.51839 × 106.91 amu) + (0.48161 × 108.90 amu) = 107.87 amu

The closest match to this atomic mass is option 1, Silver. The atomic number of silver is 47, which means it has 47 protons in its nucleus. The two stable isotopes of silver are ^107Ag and ^109Ag, which have atomic masses of 106.905 amu and 108.905 amu, respectively. The given atomic masses of the isotopes in the question are not exact matches to the known isotopes of silver, but they are close enough to identify the element as silver.

Therefore, the answer is 1. Silver.

Choosing location in supply chain is 4) All of the above.

Choosing location in the supply chain is one of the main strategic decisions that organizations have to make, itt depends on various factors such as demand and supply forecasting, aggregate planning, and inventory management. An appropriate location enables the firms to provide quality goods and services at the right time and place. The location strategy should consider several factors such as proximity to suppliers, customers, labor availability, transportation, etc.The location decision is important for the success of a business as it affects the cost of production, customer service, and market responsiveness. When a location is chosen, it affects the transportation and inventory cost.

Therefore, firms should consider the tradeoffs between the inventory carrying cost and the transportation cost when choosing a location. For instance, a firm may decide to locate closer to the customers to reduce the transportation cost but will have to incur higher inventory carrying cost due to the storage facilities. Hence, organizations need to carefully choose the best location in the supply chain that meets the needs of their customers and ensures their long-term success. Hence, the correct option is 4) All of the above.

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Answer:

1.

A. 3 significant figures

B. 4 significant figures

C. 3 significant figures

D. 2 significant figures

E. 2 significant figures

F. 2 significant figures

Answer:

The answer is Ernest Rutherford.

Answer :

Good Luck

Mass of oxygen in cylinder is 142.2 g

Given,

Volume: 7.00 l

Pressure: 16 atm

temperature: 32.8⁰c = 32.8+273.15 = 305.95K

Mass of oxygen in cylinder = ?

By Ideal gas law,

PV = nRT

PV = (mass/molar mass) RT

molar mass: 32g/mol

R = 0.0826

so,

16 × 7 = (mass/32) × 0.0826 × 305.95

Mass = 142.2g

therefore oxygen present inside the cylinder is 142.2 g in mass.

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The percentage of elements in ethylene glycol are approximately 0.332% carbon, 0.979% hydrogen, and 98.7% oxygen.

To determine the percentage of elements in ethylene glycol, we need to calculate the mass of each element in the compound and then divide it by the molar mass of ethylene glycol.

First, let's find the moles of CO2 produced. From the given data, 6.38g of ethylene glycol gives 9.06mg of CO2. We need to convert mg to grams by dividing by 1000:

9.06mg / 1000 = 0.00906g of CO2

Next, let's find the moles of H2O produced. 6.38g of ethylene glycol gives 5.5mg of H2O. Converting mg to grams:

5.5mg / 1000 = 0.0055g of H2O

Now, we need to find the moles of carbon (C) in ethylene glycol. The molar mass of CO2 is 44.01 g/mol, and the molar mass of carbon is 12.01 g/mol. Using the ratio of moles between CO2 and C:

0.00906g CO2 * (1 mol CO2 / 44.01 g CO2) * (1 mol C / 1 mol CO2) = 0.000206 mol C

Similarly, for hydrogen (H), the molar mass of H2O is 18.02 g/mol, and the molar mass of hydrogen is 1.01 g/mol:

0.0055g H2O * (1 mol H2O / 18.02 g H2O) * (2 mol H / 1 mol H2O) = 0.000608 mol H

Finally, let's find the moles of oxygen (O) by subtracting the moles of carbon and hydrogen from the total moles of ethylene glycol. The molar mass of ethylene glycol is 62.07 g/mol:

0.06207g - 0.000206 mol C - 0.000608 mol H = 0.06125 mol O

Now, let's calculate the percentage of each element in ethylene glycol:

Percentage of C = (0.000206 mol C / 0.06207 mol ethylene glycol) * 100%
Percentage of H = (0.000608 mol H / 0.06207 mol ethylene glycol) * 100%
Percentage of O = (0.06125 mol O / 0.06207 mol ethylene glycol) * 100%

Simplifying the calculations:

Percentage of C = 0.332%
Percentage of H = 0.979%
Percentage of O = 98.7%

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In order to find the concenctration of this base we will use the titration formula, which is:

Ma * Va = Mb * Vb

Where:

Ma = concentration of acid

Va = volume of acid

Mb = concentration of base

Vb = volume of base

0.32 * 30.0 = Mb * 28.1

9.6 = 28.1Mb

Mb = 0.34

Therefore the concentration of Sodium hydroxide is 0.34M

Answer:

Química orgánica

Explanation:

Answer:

1. A

2. B

3. A

4. B

5. B

6.C

7. B

8. A

Explanation:

SnO₂ + H₂ + energy → Sn + H₂0

The reaction is between Tin(iv) oxide and hydrogen gas to form tin and water molecules.

Notice the reaction is not balance therefore let us balance the equation. To balance the equation the number of atoms on both side (reactant and product)of the equation must be equal.

SnO₂ +2H₂ → Sn + 2H₂0

The equation is balanced .  SnO₂  has coefficient of 1 , H₂ has coefficient of 2, Sn has coefficient of 1 and H₂0 has coefficient of 2.

Q5

SnO₂ + 2H₂→ Sn + 2H₂0

1 moles of SnO₂ will balance the equation

Q6

The reactant is on the left side of the chemical equation. Therefore the reactants are Tin(iv) oxide and hydrogen molecules (SnO₂ and H₂)

Q7

The product is on the right side of the chemical equations .Therefore, the products are Tin and water molecules(Sn and H₂0).

Q8

The reaction is an endothermic reaction because it absorb heat from it environment.

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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