please help with this question

Answer:

An endothermic process is any process with an increase in the enthalpy H (or internal energy U) of the system. In such a process, a closed system usually absorbs thermal energy from its surroundings, which is heat transfer into the system. It may be a chemical process, such as dissolving ammonium nitrate in water, or a physical process, such as the melting of ice cubes.

The growth of coral on objects found at the bottom of the ocean is a physical change, not a chemical change.

This is because the coral is simply attaching itself to the surface of the object through a physical process, rather than changing the chemical composition of the object itself. The coral is able to attach itself to the surface due to physical forces such as adhesion, cohesion, and surface tension.

However, it is worth noting that over time, the growth of coral on an object can lead to chemical changes in the object as the coral secretes calcium carbonate, which can gradually alter the object's composition.

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Answer:

the answer is B.

Explanation:

The heat is created

The exponent to the power of 0 would be the correct answer in this situation.

Initial rate is the rate of reaction at the beginning of a chemical reaction. It is usually measured at the start of the reaction and is usually higher than the rate at equilibrium. The initial rate is an important factor in determining the rate of reaction and the products of the reaction. It can be used to determine the effects of various factors such as temperature, pressure, and concentration on the reaction rate.

Exponents represent the number of times the base number is multiplied by itself. So, if the rate does not double nor stay the same, then it is not being multiplied by itself, so the exponent would be to the power of 0.

Exponentiation can be used to show how many times a number is multiplied by itself, and this is done by raising the base number to a certain power. For example, 4 to the power of 3 means 4 x 4 x 4 = 64. In this case, the exponent is 3.

If the initial rate does not double nor stay the same, then the power associated with the exponent would be 0. This is because the rate is not being multiplied by itself, so it would not be associated with any power. Therefore, the exponent would be to the power of 0.

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HAZWOPER training and certification recognize:

The correct option is both A and C

HAZWOPER (Hazardous Waste Operations and Emergency Response) training and certification recognize that a large number of victims (as much as 80%) in hazardous waste incidents or emergencies will self-present or be self-referred for medical treatment.

Additionally, HAZWOPER training acknowledges that victims may use any entrance they can access at a hospital, not just the emergency department entrance.

This is because individuals affected by hazardous materials may arrive at different areas of the hospital seeking medical assistance.

Therefore, option d. Both A and C are correct statements regarding the recognition of HAZWOPER training and certification.

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Answer:

Molecular formula of the compound- C5H10O6

Molecular mass of the compound = 166.127 g

Explanation:

The molecule is a sugar with molecular formula C5H10O6. Now, we have to note the relative atomic masses of the elements in order to calculate the molecular mass of the compound to the hundredth place.

Carbon= 12.011, Hydrogen= 1.00784, Oxygen= 15.999

Hence , molecular mass = 5(12.011) + 10(1.00784) + 6(15.999)

Molecular mass = 60.055 + 10.0784 + 95.994

Molecular mass= 166.127 g

Answer:

The molecular formula = C5 H10 O5

Molecular mass = 150

Explanation:

C = 12.011

C X 5 = 60.055

H - 1.0079

H X 10 = 10.079

O = 15.999

O X 5 = 79.995

60.055 + 10.079 + 79.995 = 150.13

The value of ΔG for the first reaction was calculated to be -16,21,956 kJ. The reaction is spontaneous as the value of ΔG is negative. The value of ΔS for the second reaction is 3.8 J/K. In the second equation, neither the forward nor the reverse reaction is spontaneous.

ΔG only relates to variations where the temperature and the pressure are constant. This is where most reactions take place in the lab. The system is typically open to the environment (constant pressures) and the reaction is started or ended at room temperature.

If ΔG < 0, the process is spontaneous. If ΔG = 0, the system is stable. If ΔG > 0, the process isn’t spontaneous according to the formula but occurs in the opposite direction.

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Answer:

First, we need to convert the toxicity value from mg/kg to mg for a 70 kg adult:

Toxic dose for a 70 kg adult = 12,000 mg/kg x 70 kg = 840,000 mg

Next, we need to calculate the number of moles of 7-UP in one can:

Concentration of 7-UP in one can = 0.012 M

Volume of one can = 330 mL = 0.33 L

Number of moles of 7-UP in one can = concentration x volume = 0.012 mol/L x 0.33 L = 0.00396 mol

Finally, we can calculate the number of cans of 7-UP a 70 kg adult would have to drink to reach a toxic dose:

Number of cans of 7-UP = toxic dose / (number of moles in one can x molecular weight of 7-UP)

Molecular weight of 7-UP = 338.14 g/mol

Number of cans of 7-UP = 840,000 mg / (0.00396 mol x 338.14 g/mol) ≈ 619 cans

Therefore, a 70 kg adult would have to drink approximately 619 cans of 7-UP to reach a toxic dose.

Explanation:

Answer:

1.772 mols

Explanation:

Because hydrogen exists as a diatomic molecule in gaseous state, that's (H2), so then it's molecular mass is 1 ×2= 2g/mol.

we can now calculate for the number of moles, so

n=m/Mr

n=3.544/2

n=1.772mols

Answer:

Second option

Explanation:

Answer:

10.98 s

Explanation:

To solve this problem we first use the formula:

Where:

And solve for N:

Then we use the formula:

Where:

And solve for W₀.₅:

melting of wax is a physical reaction, because the same amount of wax exists before and after the change.

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The mass of \(NO_2\), in grams, that would be produced by the reaction will be 118.68 grams.

First, let's write out the balanced equation of the reaction:

\(4NH_3 (g) +7O_2 (g) -- > 4NO_2 (g) + 6H_2O(g)\)

From the equation, the mole ratio of \(NH_3\) and \(NO_2\) is 1:1.

Recall that, mole = mass/molar mass.

43.9 g of \(NH_3\) = 43.9/17.03

                        = 2.58 mol

Thus, from the 1:1 mole ratio, the equivalent mole of  \(NO_2\) produced from the reaction would be 2.58 mol.

Since, mass = mole x molar mass, the mass of 2.58 mol of  \(NO_2\) can be calculated as:

2.58 x 46.0 = 118.68 grams.

In other words, the amount of  \(NO_2\) produced by the reaction of 43.9 g of \(NH_3\) according to the chemical equation would be 118.68 grams.

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Answer:Precision can be defined as the. reproducibility of a measured value. Precision is how close the measured values are to each others. In contrast with accuracy, accuracy is the agreement between a measured value and an accepted value.

Explanation:

Answer:

They have the same number of protons, but a different number of neutrons.

Explanation:

All atoms of the same element have the same number of protons, however, they don't necessarily have the same number of neutrons. If atoms of the same element have different numbers of neutrons, they are isotopes of one another. An example is carbon-12 and carbon-13. Carbon-12 has 6 protons and 6 neutrons. Carbon-13 has 6 protons and 7 neutrons. They are isotopes.

Answer:

The electric force acting at a distance can be observed when someone rubs a glass rod with something woolen then the rod is taken away from the woolen material. The piece of paper leaps into air and sticks on to the rod. This is due to the electrostatic force of attraction that the paper sticks on the glass rod.

Explanation:

Answer:

Pam rubs a glass rod with wool, then moves the rod over a pile of small paper scraps. The scraps leap into the air and stick to the rod.

The choice of solution has a concentration of 1.144 mol/kg molality.

Molarity corresponds to the moles of solvent divided by the amount of solution in litres, whereas molality is equal with the moles of solvent divided by the quantity of solvent in kilogrammes.

Since 1 mole of solute is present in 1 litre for the solution, which contains both the solute and the solvent, 1 molar aqueous solutions are more concentrated than one decays aqueous solutions.

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Answer:

36°C is your answer

Explanation:

use the molar mass to find moles:

(10.00g Au)(1 mole Au/197 grams)= 0.05076 moles of gold

dH= n C dT

14.0 J = (.05076 moles) (25.41 J/mol* degree C) (dT)

dT=10.85 celsius rise in temp

if initially at 25 degrees celsius, a 10.85 celsius rise in temp will bring it to 35.85.

so round that answer and you should get 36 degrees as your answer

(hope this helped :) )

Considering the definition of calorimetry, the final temperature of the gold is 35.85 °C.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

In other words, calorimetry is responsible for measuring the amount of heat generated or lost in certain physical or chemical processes.

The amount of heat that a body receives or transmits is determined by the following expression:

Q = c×m×ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Then:

14 J= 25.41 \(\frac{J}{molC}\)× 0.05076 moles× (Tfinal - 25 C)

Solving:

\(\frac{14 J}{ 25.41 \frac{J}{molC}x 0.05076 moles} =Tfinal - 25 C\)

\(Tfinal=\frac{14 J}{ 25.41 \frac{J}{molC}x 0.05076 moles} + 25 C\)

Tfinal= 35.85 °C

Finally, the final temperature of the gold is 35.85 °C.

Learn more:

The forensic scientific method is a modified version of the scientific method that contrasts observable physical discoveries found at the crime scene, in the crime lab, or in the autopsy room with anamnestic evidence gathered by investigators.

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Answer:

\( \boxed{8.9 \: g /cm^3}\)

Explanation:

Given:

Mass of sample= 39.2 g

Volume occupied= 4.4 cm³

To find:

Density=?

Solution:

Formula to be used,

\(\sf Density = \frac{mass}{volume} \)

\(\sf Density = \cancel{ \frac{39.2}{4.4} } = 8.9 \bar{0} \bar{9} \: g /cm^3\)

The rounder figure answer upto tenths place can be written as 8.9 g/cm³

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The mass of the oxygen gas that is consumed in the process is 5491.2 g.

Stoichiometry is important in chemical reactions because it allows us to predict the amount of products that can be produced from a given amount of reactants, and to determine how much of each reactant is needed to produce a desired amount of product.

The equation of rust is;

4Fe + 3O2 → 2Fe2O3

Number of mols of iron III oxide

= 18.3 * 10^3g/160 g/mol

= 114.4 moles

Now;

3 moles of O2 produces 2 moles of iron III oxide

x moles of O2 produces 114.4 moles of Fe2O3

=171.6  moles

Mass of oxygen = 171.6 moles * 32 g/mol

= 5491.2 g

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An error during DNA replication would create a gene mutation.

During DNA replication, the genetic information in a cell is copied to make new DNA molecules. However, mistakes can occur during this process, leading to changes in the DNA sequence, which can result in a mutation. Mutations can also be caused by exposure to environmental factors, such as radiation or chemicals, which can damage the DNA molecule directly or affect the cellular processes involved in DNA replication.

Mutations can have a variety of effects on the organism, ranging from no effect to causing serious health problems or even death. Gene mutations can also be inherited from a parent, which can result in genetic disorders or predisposition to certain diseases. Therefore, it is important to understand the mechanisms of gene mutations and their potential impacts on organisms.

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Answer:

A. Notify the teacher immediately.

C. Immediately wash off any chemicals on skin or eyes with cool running water.

D. Remain calm and help others remain calm.

Types of luminous flames:

1. Yellow Luminous Flame

2. Smoky Luminous Flame

3. Orange Luminous Flame

4. Blue Luminous Flame

Luminous flames are characterized by their visible glow, which is caused by the incomplete combustion of fuel. The presence of soot particles in the flame causes the emission of light. There are different types of luminous flames, which can be classified based on their fuel composition and burning conditions. Here are some common types of luminous flames:

1. Yellow Luminous Flame: This is the most common type of luminous flame, often seen in open fires, candles, and gas stoves. It appears yellow due to the presence of soot particles in the flame. Yellow flames indicate incomplete combustion of hydrocarbon fuels, such as methane, propane, or natural gas. The high carbon content in these fuels leads to the formation of soot, which emits visible light.

2. Smoky Luminous Flame: This type of flame is characterized by a significant amount of black smoke and soot production. It is commonly observed in poorly adjusted or malfunctioning burners or engines. The excessive presence of unburned fuel in the flame results in incomplete combustion and the emission of dark smoke particles.

3. Orange Luminous Flame: An orange flame indicates a higher combustion temperature compared to a yellow flame. It is often seen in more efficient burners or when burning fuels with a higher carbon content, such as oil or diesel. The higher temperature helps in burning more of the carbon particles, reducing the amount of soot and making the flame appear less yellow.

4. Blue Luminous Flame: A blue flame is typically associated with complete combustion. It indicates efficient burning of fuel, resulting in minimal soot formation. Blue flames are commonly observed in gas burners or Bunsen burners. The blue color is a result of the combustion of gases, such as methane, in the presence of sufficient oxygen.

It's important to note that the luminosity of a flame can vary depending on factors such as fuel-air mixture, combustion temperature, and the presence of impurities. Achieving complete combustion and minimizing the production of soot is desirable for efficient and cleaner burning processes.

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Answer:

D.  Gas X has a lower density and effuses faster than Gas Y.

Explanation:

I took the test.

Gas X has a lower density and effuses faster than Gas Y. Hence, option D is correct.

Density is the amount or the number of entities that can be contained in an area. It is denoted by ρ and is calculated as,

ρ = Mass ÷ Volume

Diffusion is the process of movement of a substance from the area of higher concentration to the area of lower concentration.

Effusion  is the process of a gas being poured out through a hole diametrically smaller than the structural exit of the container.

The gas with a smaller mass will diffuse slower in rate than the gas with a higher mass.

Hence, Gas X has a lower density and effuses faster than Gas Y.

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Answer:

No

Explanation:

zinc and others are more reactive than iron not titanium

Answer:

Weathering ➡️ Erosion ➡️ Deposition ➡️ Compaction ➡️ Cementation

Explanation:

The processes of sedimentary rock formation involves:

1. Weathering: The preexisting rocks are weathered through abrasion caused by sand-blasting and other weathering processes. This breaks down the rocks into smaller pieces.

2. Erosion: Erosion acts as an agent of transportation of the weathered products. The sediments that are weathered are transported through erosion. The flowing or flooding water carries them to where they are deposited.

3. Deposition: The weathered materials are eroded and deposited layer upon layer. This happens when there is nothing that can move them away again.

4. Compaction: The sedimentation continues as the deposited sediments become increasingly overburden. They begin to compact together and closing down pore spaces.

5. Cementation: The dissolved minerals begin to form mineral crusts through precipitation or crystallization. This gradually cements the sediments to form a rock.

Answer:

weathering, erosion, deposition, cementation, conpaction