4. Solve the following heat flow problem, being sure to show all your work (you may either type your
work or insert an image): Find the specific heat of 402 grams of graphite that absorbs 1136) of heat
energy as it changes temperature from 26°C to 30°C.
Answer should be 0.7J/gC

As a result, we can claim that the student was correct about the +1 on H and -1 on I, but only for HI and not for the diatomic gases as well, since when the elements work alone in a chemical equation, their oxidation states must be zero since they are not producing any ions.

There is an oxidation process when oxygen interacts with a substance or an element. The process of removing hydrogen from the reactant species is another definition of oxidation.

When atoms or groups of atoms lose electrons, a process known as electron capture takes place. When a chemical species obtains oxygen or loses hydrogen, this is another way to describe oxidation.

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Answer:

7.88 g/mL

Explanation:

In order to calculate the density we need the mass and the volume of the metal.

The mass is already given by the problem (256.0 g). As for the volume, we can calculate it using Archimede's principle: The volume of water the metal displaced is equal to the volume of the metal.

Thus the volume of the metal is 32.5 mL.

The density of the metal is 7.88 g/mL

It is defined as the ratio of mass over volume.

\(\text{Density}=\frac{\text{Mass}}{\text{Volume}}\)

As for the volume, we can calculate it using Archimedes' principle: The volume of water the metal displaced is equal to the volume of the metal.

Volume of Water displaced = 87.3 mL - 54.8 mL = 32.5 mL

Thus, the volume of the metal is 32.5 mL.

So, density will be:

\(\text{Density}=\frac{\text{Mass}}{\text{Volume}}\\\\\text{Density}=\frac{256 g}{32.5mL} \\\\\text{Density}=7.88g/mL\)

Thus, the density of the metal will be 7.88 g/mL.

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0.785 g of lithium hydroxide (LiOH) are produced when 0.38 g of lithium nitride (Li₃N) reacts with an excess of water.

we can see that 3 moles of lithium hydroxide (LiOH) are produced for every 1 mole of lithium nitride (Li₃N) that reacts.

To determine the mass of LiOH produced from 0.38 g of Li₃N, we need to first calculate the number of moles of Li₃N present:

molar mass of Li₃N = 3 x atomic mass of Li + 1 x atomic mass of N

= 3 x 6.94 g/mol + 1 x 14.01 g/mol

= 34.83 g/mol

moles of Li₃N = mass / molar mass

= 0.38 g / 34.83 g/mol

= 0.01093 mol

Since the balanced equation shows that 1 mole of Li₃N produces 3 moles of LiOH, we can calculate the number of moles of LiOH produced:

moles of LiOH = 3 x moles of Li₃N

= 3 x 0.01093 mol

= 0.03279 mol

Finally, we can use the molar mass of LiOH to convert from moles to grams:

molar mass of LiOH = atomic mass of Li + 1 x atomic mass of O + 1 x atomic mass of H

= 6.94 g/mol + 15.99 g/mol + 1.01 g/mol

= 23.94 g/mol

mass of LiOH produced = moles of LiOH x molar mass of LiOH

= 0.03279 mol x 23.94 g/mol

= 0.785 g

Therefore, approximately 0.785 g of lithium hydroxide (LiOH) are produced when 0.38 g of lithium nitride (Li₃N) reacts with an excess of water.

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Hi there! Answer is below :)

Explanation:

For this question, we apply Boyle's Law and Charles' Law.

When you double the amount of pressure and temperature of a compound or mixture, the volume will decrease by a half. So, if the pressure and temperature are 2, and the volume is 1, and you double, your volume will be 0.5 and your pressure and temperature will be 4.

Best of Luck!

Answer:

4.0026 atomic mass unit

Explanation:

The symbol "He" represents the chemical element helium. Helium is a colorless, odorless, and non-toxic gas that is the second lightest element in the periodic table. It is represented by the atomic number 2 and has an atomic mass of about 4.0026 atomic mass units (u). Helium is known for its low boiling point, making it commonly used as a cryogenic refrigerant and for filling balloons. It is also used in various scientific and industrial applications, such as cooling superconducting magnets, as a shielding gas in welding, and as a component in gas chromatography.

Answer:

D.

Explanation:

Genetic Engineering is a huge part in manipulating a foods property. Chemical engineering mostly the science with numbers in foods.

Biology is literally the life of the food.

Genetic engineering, chemical engineering, biology fields are significantly involved in food engineering.

Hence, Option (D) is correct answer.

Food engineering is the application of engineering principles which develop and design the systems for the production, storing, distributing and processing the food material.

Food engineering is engineering field that combines microbiology, genetic engineering, chemistry engineering, biology and some other branches of science to produce food materials.

Thus from the above conclusion we can say that Genetic engineering, chemical engineering, biology fields are significantly involved in food engineering.

Hence, Option (D) is correct answer.

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The balanced equation of the decomposition of hydrogen peroxide is as follows:

0.030 mol He x 22.4 L He = 0.672 L He

Hydrogen peroxide is a compound of hydrogen and oxygen combined in a ratio of 1 : 1.

The products of the decomposition of hydrogen peroxide are water and oxygen gas. The equation of the decomposition of hydrogen peroxide is given below:

2 H₂O₂ ----> 2 H₂O + O₂

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To find out if the diet lemonade contains any sugar, Liam should follow these steps (using Benedict's solution):

1. Take a sample of the diet lemonade and pour it into a test tube.

2. Add a few drops of Benedict's solution to the test tube with the diet lemonade sample.

3. Mix it to make it homogeneous.

4. Take the test tube to a water bath.

5. Heat the test tube in the water bath.

6. If the solution (sample of diet lemonade + drops of Benedict's solution) turns orange-red, the diet lemonade contains sugar.

These rocks turns into the rust by the process of the oxidation. As rust can be expands, so it can weakens the rocks and helps break it apart.

We know that from our daily life rust for example is iron oxide. When specially the rocks which contains the iron, if exposed or leave to the water and air, then the iron undergoes an oxidation reaction as a result which can weaken the rocks and make the rocks crumble from the inside.

Actually the oxidation produces an iron oxides minerals. The process of the rusting can also change the colour of the iron. It can be changed in several colours like red, brown or yellow.

So we can conclude that these rocks turns into the rust by the process of the oxidation. As rust can be expands, so it can weakens the rocks and helps break it apart.

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Answer:

here is the answerhope it helps.

The rate of reaction is directly proportional to the concentration of reactants &  temperature of the reaction.

So, 0.10M HCl at 80 o C will result in the fastest rate of reaction with 1.00g of zinc.

The rate of reaction is directly proportional to the concentration of reactants & temperature of the reaction So, 0.10M HCl at 80o C will result in the fastest rate of reaction with 1.00g of zinc.

What is temperature?

How hot or cold something is can be expressed numerically using the physical concept of temperature. Temperature is measured with a thermometer. Different temperature scales, which traditionally established various reference points and thermometric materials, are used to calibrate thermometers.

The rate of reaction is directly proportional to the concentration of reactants \& temperature of the reartion. So, $0.10\(\mathrm{M} \mathrm{HCl}$ at $80^{\circ} \mathrm{C}$ will result in $Q_{\text {astest rate of reaction with } 1.00 \mathrm{~g} \text { of }}$\)zinc.

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Answer: Therefore, the molar mass of the volatile liquid is 176.08 g/mol.

Explanation:

To solve this problem, we can use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

Pressure of the vapor in atm:

The pressure of the vapor is given as 756 mmHg. Converting this to atm:

1 atm = 760 mmHg

756 mmHg = 0.9947 atm

Therefore, the pressure of the vapor is 0.9947 atm.

Temperature of the vapor in Kelvin:

The temperature of the vapor is given as 99.0 C. Converting this to Kelvin:

T(K) = T(C) + 273.15

T(K) = 99.0 + 273.15

T(K) = 372.15 K

Therefore, the temperature of the vapor is 372.15 K.

Volume of the vapor (assume the density of h2o= 1.00g/ml):

To find the volume of the vapor, we can use the volume of the flask and the mass of the water that was added to it. Since the mass of the flask with the condensed liquid is given as 92.209 g, and the mass of the empty flask is 90.008 g, the mass of the condensed vapor is:

92.209 g - 90.008 g = 2.201 g

Since the density of water is 1.00 g/mL, the volume of the water that was added to the flask is:

2.201 mL

Therefore, the volume of the vapor is 250 mL - 1.5 mL - 2.201 mL = 246.299 mL.

Mass of the condensed vapor:

As calculated earlier, the mass of the condensed vapor is 2.201 g.

Moles of vapor:

To find the number of moles of the vapor, we can use the ideal gas law equation, and solve for n:

n = PV/RT

Since we know the pressure, volume, and temperature of the vapor, we can substitute those values along with the gas constant R:

n = (0.9947 atm)(246.299 mL/1000 mL/L) / (0.08206 Latm/molK)(372.15 K)

Simplifying, we get:

n = 0.0125 mol

Therefore, the number of moles of vapor is 0.0125 mol.

Molar mass of volatile liquid:

To find the molar mass of the volatile liquid, we can use the formula:

molar mass = mass/ moles

The mass of the volatile liquid is the difference between the mass of the flask with the condensed liquid and the mass of the empty flask:

mass = 92.209 g - 90.008 g = 2.201 g

Substituting the values for mass and moles, we get:

molar mass = 2.201 g/ 0.0125 mol

Simplifying, we get:

molar mass = 176.08 g/mol

Answer:

Explanation:

1,2,4,

The equations that show combustion are equations A, B and D.

When we talk about combustion, the idea is that the substance would be burnt in oxygen. In other words, the combustion can be taken to be an oxidation reaction. It is an oxidation reaction in the sense that the oxidation number of the substance that is reacting with the oxygen would become increased.

When we look at the equations that we have, it is quite easy to pick out among the balanced reaction equations that are shown here the ones that has to do with the burning of the substance in oxygen and a consequent rise in the oxidation number.

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1) List the known and unknown quantities.

Sample: unknown.

Concentration: 1.0*10^(-4).

pH: 10.00.

Characteristic: unknown.

2) pH scale.

Weak acid: 4 - 6

Weak base: 8 - 10

Strong acid: 1 - 3

Strong base: 11 - 14

According to the more specific pH scale above, 10.00 corresponds to a weak base.

Option B.

Algal blooms and high concentrations of nitrogen in water are effects of water pollution. Overgrazing and the use of chemical fertilizers cause water pollution.

Algal blooms are an effect of water pollution. They occur when there is an excessive amount of nutrients, particularly nitrogen and phosphorus, in the water due to pollution. The overgrowth of algae depletes the oxygen levels in the water, which can harm fish and other aquatic animals.

Overgrazing can cause water pollution by increasing the sedimentation rate of waterways. This sedimentation can carry nutrients, bacteria, and other pollutants into the water, which can degrade water quality and cause harm to aquatic life.

The use of chemical fertilizers to enhance production is a cause of water pollution. When fertilizer is overused, it can leach into waterways and cause nutrient pollution, which can lead to algal blooms and other forms of water pollution.

High concentrations of nitrogen in water are often an effect of water pollution. This can be caused by the overuse of fertilizers or the discharge of untreated sewage into waterways. High nitrogen levels can cause algal blooms, which can lead to oxygen depletion and harm aquatic life.

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Answer:

Cause:

: : use of chemical fertilizers to enhance production

: : overgrazing

Effect:

: : high concentration of nitrogen in water

: : algal blooms

Hope this helps ;)

Answer:

Question 1:

Answer: M: (17 - 35) & (17 - 37), N:(8 - 18) (8 - 16) & (8 - 17)

• Isotopes are atoms of the same element with same atomic number but different mass numbers.

Question 2:

Answer: Element M has high nuclear charge than element N

• Nuclear charge depends on atomic number or proton number.

\(.\)

Answer:

its shorter than a regular one

Explanation:

the only reason is simply because it is shorter

When the pressure is increased to 90.0 mm Hg, the volume will be approximately 12.30 liters.

To solve this problem, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature.

Initial conditions:

Volume (V1) = 15.2 liters

Pressure (P1) = 0.960 atm

New conditions:

Volume (V2) = 35.0 liters

Pressure (P2) = 90.0 mm Hg

First, we need to convert the pressure from mm Hg to atm:

P2 = 90.0 mm Hg * (1 atm / 760 mm Hg) = 0.1184 atm

Now we can apply Boyle's Law:

P1 * V1 = P2 * V2

0.960 atm * 15.2 L = 0.1184 atm * V2

V2 = (0.960 atm * 15.2 L) / 0.1184 atm

V2 ≈ 12.30 L

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Answer:

An alloy is a homogeneous mixture

Explanation:

D

An alloy, a metallic substance composed of two or more elements, as either a compound or a solution is a homogeneous mixture. The correct option is d.

An alloy is a mixture of chemical elements of which at least one is a metal. Unlike chemical compounds with metallic bases, an alloy will retain all the properties of metal in the resulting material, such as electrical conductivity, ductility, opacity, and lustre, but may have properties that differ from those of pure metals, such as increased strength or hardness.

In some cases, an alloy may reduce the overall cost of the material while preserving important properties. In other cases, the mixture imparts synergistic properties to the constituent metal elements such as corrosion resistance or mechanical strength. Alloys are defined by a metallic bonding character. The alloy constituents are usually measured by mass percentage for practical applications, and in atomic fraction for basic science studies.

Alloys are usually classified as substitutional or interstitial alloys, depending on the atomic arrangement that forms the alloy.

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Answer:

no.3 is your correct answer

K and Br

Ionic bonds form through the transfer of electrons.

Ionic Bonds

Ionic bonds form when 2 atoms or molecules transfer electrons between each other. This transfer of electrons changes the atoms into ions. Ions are charged particles, and where ionic bonds get their name from. In an ionic bond, one atom will lose electrons and become positively charged; this particle is known as a cation. The atom that gains electrons and becomes negatively charged is known as an anion.

Identifying Ionic Bonds

One of the easiest ways to identify an ionic bond is by identifying the types of atoms that are bonding. In most cases, when a metal and nonmetal bond, an ionic bond will form. This is due to the large difference in electronegativity between metals and nonmetals. This leads to the metal being a cation and the nonmetal being an anion. Since K (potassium) is a metal and Br (bromine) is a nonmental, they will form an ionic bond.

To find metals and nonmetals we can look at the periodic table. Metals are on the left side of the table and make up the majority of the elements. Nonmetals are on the right side of the table.

The current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

To calculate the current in amperes, we need to use Faraday's laws of electrolysis and the stoichiometry of the reaction.

Faraday's laws state that the amount of substance produced or consumed during electrolysis is directly proportional to the quantity of electricity passed through the cell. The relationship is given by:

Q = nF

Where Q is the electric charge in coulombs (C), n is the number of moles of substance involved in the reaction, and F is Faraday's constant, which is equal to 96,485 C/mol.

In this case, the substance being produced is Cl2, and we know the mass of Cl2 produced, which is 4.8 x 10^5 g.

First, we need to calculate the number of moles of Cl2 produced:

Molar mass of Cl2 = 35.45 g/mol

Moles of Cl2 = mass / molar mass = (4.8 x 10^5 g) / (35.45 g/mol) ≈ 1.354 x 10^4 mol

Now we can calculate the quantity of electricity passed through the cell using Faraday's laws:

Q = nF

Q = (\(1.354 x 10^4\)mol) * (96,485 C/mol)

Q ≈ 1.308 x 10^9 C

The quantity of electricity is given in coulombs. To find the current, we need to divide this value by the time in seconds.

Given that the time is 18 hours, we convert it to seconds:

Time = 18 hours * 60 minutes/hour * 60 seconds/minute

Time = 6.48 x 10^4 seconds

Finally, we can calculate the current:

Current (I) = Q / Time

I = (1.308 x 10^9 C) / (6.48 x 10^4 s)

I ≈ 2.02 x 10^4 Amperes

Therefore, the current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

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There are a total of 250 hydrogen atoms inside the container.

Each molecule of C₄H₁₀O contains 10 hydrogen atoms. Therefore, the total number of hydrogen atoms in the container can be found by multiplying the number of molecules by the number of hydrogen atoms per molecule:

Total number of hydrogen atoms = 25 molecules x 10 hydrogen atoms/molecule

= 250 hydrogen atoms

So, there are a total of 250 hydrogen atoms inside the container.

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Answer:

c) Cohesive forces stronger than adhesive forces reduce the height of the liquid in the capillary tube, whereas adhesive forces stronger than cohesive forces increase the height of the liquid.

Explanation:

Two types of forces bring about capillary action.

One is cohesion, which is the intermolecular attraction between like molecules (that is, the liquid molecules). The second force, called adhesion, is an attraction between unlike molecules, such as those in a liquid and in the sides of a glass tube.

If adhesion is stronger than cohesion, the contents of the tube will be pulled upward. This process continues until the adhesive force is balanced by the weight of the liquid in the tube.

The mass concentration of sand in the ethanol solution is 0.299 g/dm³.

To find the concentration in grams per cubic decimeter (g/dm³), we first need to convert the volume from liters to cubic decimeters (dm³). Since 1 liter is equal to 1 cubic decimeter, we can directly convert the volume.

Given:

Mass of sand = 0.2 g

Volume of ethanol = two-thirds liter

Converting volume to dm³:

1 liter = 1 cubic decimeter

two-thirds liter = (2/3) cubic decimeter = 0.67 dm³ (rounded to two decimal places)

Now we can calculate the concentration in g/dm³ by dividing the mass of sand by the volume in dm³:

Concentration = Mass / Volume

Concentration = 0.2 g / 0.67 dm³

Concentration ≈ 0.299 g/dm³ (rounded to three decimal places)

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The average atomic mass of titanium on the given planet is approximately 46.68164 atomic mass units (u). The average atomic mass may vary depending on the specific isotopic composition of titanium found on different celestial bodies or regions.

To calculate the average atomic mass of titanium on the given planet, we need to consider the natural abundances and masses of each isotope of titanium.

The average atomic mass is calculated by multiplying the natural abundance of each isotope by its respective mass and summing them up.

Let's perform the calculation step by step:

Step 1: Multiply the abundance of each isotope by its mass:

(73.700% * 45.95263 u) + (15.000% * 47.94795 u) + (11.300% * 49.94479 u)

Step 2: Calculate the individual contributions from each isotope:

= (0.737 * 45.95263) + (0.150 * 47.94795) + (0.113 * 49.94479)

Step 3: Add up the individual contributions:

= 33.84765431 + 7.1921925 + 5.64179347

Step 4: Sum up the contributions:

= 46.68164 u

Therefore, the average atomic mass of titanium on the given planet is approximately 46.68164 atomic mass units (u).

It's important to note that the calculation assumes the provided natural abundances are accurate and representative of the titanium isotopes on that planet.

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Answer:

Given molecule is CCl2F2.

What is the direction and magnitude of the net dipole of CCl2F2?

Explanation:

Dipole moment is a vector quantity.

The arrow end starts from a less electronegative atom and directs towards the more electronegative atom.

In the given molecule,

CCl2F2,

the central atom is carbon with sp3 hybridsation and there are no lone pairs on the central atom.

The molecule is tetrahedral but it is asymmetrical.

Because all the four bonded atoms are not same and there exists an electronegativity difference between F and Cl.

Hence, there exists a net dipole moment for the given molecule and the molecule is polar.