Substance that increases the rate of a reaction without being used up?
A. Inhibitor
B.Catalyst
C.Rate Law
D.Activation Energy

Answer:

aluminium is all of isotope with 14 neutrons .

Answer:

The total amount of heat is 250.64 kcal.

Explanation:

Given that,

Total amount of heat = 2.000 kg

Temperature of snow = -15.00°C

Temperature of water = 38.00°C

Heat of fusion of water = 1.44 kcal/mol

Specific heat of solid water = 0.488 cal/g°C

Specific heat of liquid = 1.00 cal/g°C

We need to calculate the heat required to bring temperature -15°C to 0°C snow

Using formula of heat

\(Q_{1}=mc_{p}\Delta T\)

Put the value into the formula

\(Q_{1}=2000\times0.488\times(0+15)\)

\(Q_{1}=14640\ cal\)

\(Q_{1}=14.640\ kcal\)

We need to calculate the heat required to convert 0°C snow  into 0°C water

Using formula of heat

\(Q_{2}=ml\)

Put the value into the formula

\(Q_{2}=\dfrac{2000}{18}\times1.44\)

\(Q_{2}=160\ kcal\)

We need to calculate  heat required to increases temperature of water from 0°C  to 38°C

Using formula of heat

\(Q_{3}=mc_{p}\Delta T\)

Put the value into the formula

\(Q_{3}=2000\times1.00\times(38-0)\)

\(Q_{3}=76000\ cal\)

\(Q_{3}=76\ kcal\)

We need to calculate the total heat

Using all heat amount

\(Q=Q_{1}+Q_{2}+Q_{3}\)

Put the value into the formula

\(Q=14.640+160+76\)

\(Q=250.64\ kcal\)

Hence, The total amount of heat is 250.64 kcal.

The heat of vaporization of benzene is required.

The heat of vaporization of benzene is 33009 J/kg.

\(T_0\) = Normal boiling point = 80.1+273.15 K

\(T_B\) = Boiling point at given pressure = 26.1+273.15 K

\(R\) = Gas constant = 8.314 J/mol K

\(P\) = Pressure at given \(T_B\) = 100 torr

\(\Delta H\) = Heat of vaporization

From the Clausius–Clapeyron equation

\(\dfrac{1}{T_B}=\dfrac{1}{T_0}-\dfrac{R\ln(\dfrac{P}{P_0})}{\Delta H}\\\Rightarrow \Delta H=\dfrac{R\ln\dfrac{P}{P_0}}{\dfrac{1}{T_0}-\dfrac{1}{T_B}}\\\Rightarrow \Delta H=\dfrac{8.314\times \ln\left(\frac{100}{760}\right)}{\frac{1}{80.1+273.15}-\frac{1}{26.1+273.15}}\\\Rightarrow \Delta H=33008.99\ \text{J/kg}\)

The heat of vaporization of benzene is 33009 J/kg.

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Answer:

2Al+3FeO→Al2O3+3Fe

Explanation:

Basically, to get this answer, you need to balance the amount of Aluminum to the ammount on the other side which is 2 so you need 2 Al to balance the reaction correct, next you move on to the amount of Oxygen in the reaction, there are three Oxygen’s on the right and one on the left, so you need 3 FeO in order for the Oxygens to be balanced. Now that the Iron is unbalanced on both sides, you need 3 Fe (on the right) in order for the equation to be balanced.

The balanced chemical reaction is \(2Al+3FeO\) → \(Al_2O_3+3Fe\)

A balanced chemical equation occurs when the number of atoms involved on the reactants side is equal to the number of atoms on the products side.

To balance a reaction means to make the number of atoms the same on both the reactants and products sides. To do so, coefficients need to be added to the chemical equation.

Hence, the balanced the chemical reaction is \(2Al+3FeO\) → \(Al_2O_3+3Fe\).

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To measure reaction heat under isochoric conditions, a bomb calorimeter is needed.

This device is designed to maintain a constant volume (isochoric) during the reaction, allowing for accurate measurement of reaction heat. To improve the accuracy of the coffee cup calorimeter for measuring reaction heat under isobaric conditions, a modification that could be made is to use a stirring device to ensure uniform mixing of the reactants and to minimize heat loss to the surroundings.

Additionally, a lid with a small hole could be placed over the top of the calorimeter to prevent heat loss while still allowing for pressure equalization. These modifications would help to minimize errors in heat measurement and improve the accuracy of the results obtained.

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Answer: The mass of blue copper sulfate is 3.5 g

Explanation:

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.

This also means that total mass on the reactant side must be equal to the total mass on the product side.

The chemical equation for the heating of copper sulfate crystals is:

Let the mass of blue copper sulfate be 'x' grams

We are given:

Mass of copper sulfate powder = 2.1 grams

Mass of water = 1.4 grams

Total mass on reactant side = x

Total mass on product side = (2.1 + 1.4) g

So, by applying law of conservation of mass, we get:

Hence, the mass of blue copper sulfate is 3.5 grams

Answer:

Mass = 48 g

Explanation:

Given data:

Number of moles of H₂ react= 3.00 mol

Number of moles of O₂ react= 1.50 mol

Number of moles of water formed = 3.00 mol

Mass of oxygen react = ?

Solution:

Chemical equation:

2H₂ + O₂    →      2H₂O

It is stated in given question when 1.50 moles of oxygen react 3.00 moles of water are formed. Thus, mass of 1.50 moles of oxygen is

Mass of oxygen:

Mass = number of moles × molar mass

Mass = 1.50 mol × 32 g/mol

Mass = 48 g

The sample that uses the substance that Jacob and Natalie should use to make a cold pack that will do the best job of keeping food cool is sample 2, because it absorbs the most energy (option B).

Endothermic refers to a chemical reaction that absorbs heat energy from its surroundings. This ensures that the temperature of the surroundings is cool or has a lower temperature.

According to this question, Jacob and Natalie are asked by their science teacher to design a warming or cooling device. They make use of certain substances, however, sample 2 has the lowest final temperature of -4°C.

This shows that sample 2 absorbs the most energy, hence, would be the best for keeping the food cool.

The incomplete question is as follows:

Jacob and Natalie are asked by their science teacher to design a warming or cooling device. They decide to design a cold pack that can be used to help keep food cool. Jacob and Natalie read about different substances that can be used inside cold packs and learn that most cold packs use endothermic reactions to cool objects.

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Answer:

A. The actual number of atoms in a molecule

Explanation:

Molecular formula is simply defined as a type of chemical formula that describes the type and number of atoms present in a single molecule of a compound.

Looking at the options, the correct answer is option A.

Answer:

a

Explanation:

Answer:

copper has two naturally occurring isotopes. Cu-63 has an atomic mass of 62.9296 amu and an abundance of 69.17%. if thats what ur looking for?

Explanation:

Answer:

Explanation:

yesyesyesyesyesyesyesyesyes

When these ions are created, they enter the solution and have the ability to conduct charge by travelling anticlockwise to the circuit's electrons.

Because their ions were free to move around, ionic substances conduct electricity if they are molten (liquid) or even in aqueous (dissolved in water). Ions in ionic compounds are maintained in fixed locations and are unable to move, therefore they cannot conduct electricity while solid.

Ions are all charged. As a result, anions travel in the direction of positively charged electrode whereas ions with positive charges move in the opposite direction. The charge moves together with the motion of the ions. Current is created by this charge movement

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Answer:

moving

Explanation:

In order to produce an electric current in a coil of wire, a magnet field through the coil must be moving.

Electromagnetic induction is a process in which electric field is produced due to the change in the value of magnetic field.

So, for the production of an electric current in a coil of wire, a magnet field should be moving through the coil of wire. Process of this electromegnetism get clear through the below attached image.

Hence magnetic field should be moving.

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Explanation:

All atoms of one type were identical in mass and properties.

Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

Answer:

B

Explanation:

Answer:

The half-life varies depending on the isotope.

Half-lives range from fractions of a second to billions of years.

The half-life of a particular isotope is constant.

Explanation:

Make sure you add the options

Answer:

so I don't know how to answer that

An indicator usually signals the endpoint of a neutralization reaction by undergoing a color change. They aid in discovering the point of equivalence of a titration.

The kind of indicator used depends on the nature of acid/base reacted.

In the case of  CH3NH2 with HBr which  strong acid and weak base titration, suitable indicators include; bromophenol blue, methyl  orange, methyl red, and chlorophenol blue.

In the case of HNO3 with NaOH, this is a strong acid, strong base titration hence phenolphthalein, methyl red, chlorophenol, and bromothymol blue cresol red blue are suitable indicators.

In the case of  HNO2 with KOH, this a weak acid, strong base titration and the suitable indicators are cresol red and  phenolphthalein.  

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In both plants and animals, the process of cellular respiration may be broken down into the following steps: Oxygen + carbon dioxide.

When plant cells undergo cellular respiration, oxygen is taken in through the plant's leaves from the surrounding atmosphere, and carbon dioxide is exhaled back into the atmosphere as a byproduct of the process. In contrast, when animal cells undergo cellular respiration, oxygen is taken in through the lungs, and carbon dioxide is exhaled through the lungs.

Therefore, a quick review, throughout the process of cellular respiration, plants and animals trade oxygen and carbon dioxide with one another.

Therefore, we may draw the following conclusion: Oxygen + carbon dioxide is a shorthand for the process of cellular respiration in plants and animals.

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Answer:

it should be chlorine gas

Explanation:

Answer:

3 moles of oxygen at STP will occupy a volume of 3×22. 4=67. 2 L.

Explanation:

A. The limiting reactant would be oxygen.

B. The mole of excess reactant (\(CS_2\)) would be 0.67 mol.

C. 0.33 mol \(CO_2\) and 0.67 mol \(SO_3\)  would be formed.

Carbon disulfide burns in oxygen to produce carbon dioxide and sulfur dioxide according to the balanced equation below:

\(CS_2(l) + 3O_2(g) -- > CO_2(g) + 2SO_2(g)\)

The mole ratio of the carbon disulfide and the oxygen gas is 1:3. In other words, every mole of \(CS_2\) requires 3 moles of \(O_2\) for complete combustion.

A. From the established mole ratio, if 1.00 mol of \(CS_2\) reacts with 1.00 mol of \(O_2\), the limiting reactant would be \(O_2\) because 3 moles of it are required for every mole of \(CS_2\).

B. The excess reactant is, thus, \(CS_2\). 1.00 mol of \(O_2\) would require:

3 mol \(O_2\) = 1 mol \(CS_2\)

1 mol \(O_2\) = 1 x 1/3

               = 0.33 mol of \(CS_2\)

But 1 mole of \(CS_2\) reacted. The excess mole of \(CS_2\) would be: 1 - 0.33 = 0.67 mol.

C. From the equation of the reaction, 3 mole of oxygen produces 1 mole of \(CO_2\). Thus, 1 mole of oxygen would produce:

3 mol \(O_2\) = 1 mol \(CO_2\)

1 mol \(O_2\) = 1 x 1/3

              = 0.33 mol \(CO_2\)

Also, 3 mol oxygen produces 2 moles \(SO_2\). Then 1 mol oxygen will produce:

2 x 1/3 = 0.67 mol

Thus, 0.33 mol \(CO_2\) and 0.67 mol \(SO_3\) will be formed from 1 mol of \(O_2\).

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Carbon disulfide burns in oxygen to yield carbon dioxide and sulfur dioxide according to the following chemical equation. CS2(l) + 3O2(g) → CO2(g) + 2SO2(g)

a. If 1.00 mol CS2 reacts with 1.00 mol O2, identify the limiting reactant.

b. How many moles of excess reactant remain?

c. How many moles of each product are formed?

Answer:

true

Explanation:

Hotter things have more heat energy than colder things. That's because the atoms or molecules move around faster in hot things (red, right) than they do in cold things (blue, left). ... The more heat you supply, the faster the molecules move and the further apart they get.

Answer: Depends on the situation.

Explanation: Hotter things do have more energy than colder things. But, if the mass of the colder thing is bigger, it really depends. If the colder thing have way more particles than the hotter thing, the colder thing may have more energy.

Answer:

3.22m

Explanation:

c=3×10^8m/s=speed of the light

lambda= wavelength=?

frequency=?

lambda=c÷frequency

lambda=(3×10^8)÷(93.1×10^6)

lambda=3.22m

Answer:

Back away from the situation and tell the supervisor/teacher

These substances have dispersed particles that are large enough to scatter light, making the beam visible. Therefore, out of the options provided, a mixture that scatters light is an example of a colloid. Option B)

A colloid is a type of mixture in which particles are dispersed throughout a medium, creating a homogeneous appearance. Unlike solutions, where the particles are completely dissolved, and suspensions, where the particles settle out, colloids have particles that are larger than those in solutions but smaller than those in suspensions. One characteristic of colloids is that they can scatter light due to the size of the particles. This scattering of light is known as the Tyndall effect. Examples of colloids include milk, fog, and aerosol sprays. These substances have dispersed particles that are large enough to scatter light, making the beam visible. Therefore, out of the options provided, a mixture that scatters light is an example of a colloid. Therefore option B) is correct

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Note Complete Question

which is an example of a colloid?

a mixture that settles out,

b mixture that scatters light,

c mixture that is separated by filtration,  

d salt and water mixture?

Answer:

a number should be rounded up it is 5 or higher