PLEASE HURRY IM TIMED Which of the following are examples of physical changes? (Select all that apply.)
tearing a piece of paper
a nail rusting
crushing a soda can

Answer:

  665 kJ

Explanation:

We assume that carbohydrates and protein each have 4 kilocalories per gram, and that fat has 9 kilocalories per gram. Then the number of kilocalories in the peanut butter is ...

  4(6 +9) +9(11) = 159 . . . . kilocalories

Each kilocalorie translates to 4.184 kilojoules, so the total is ...

  (159 kCal)(4.184 kJ/kCal) = 665.256 kJ

2 Tbsp of crunchy peanut butter contains about 665 kJ of energy.

The number of kilojoules in two table spoons of crunchy peanut butter obtained by adding the amount of kilojoules in each food type is 673kJ

From the table given ; the amount of kilojoules per gram of each food type is :

I gram of Carbonhydrate = 17 kJ

6 grams of Carbonhydrate = (6 × 17) = 102 kJ

I gram of Fat = 38 kJ

11 grams of Carbonhydrate = (11 × 38) = 418 kJ

I gram of Protein = 17 kJ

9 grams of Carbonhydrate = (9 × 17) = 153 kJ

Therefore, the total kilojoules present is (102 + 408 + 153)kJ = 673 kJ

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Answer:

Elements

Explanation:

Answer:

The formula is MgCl2

Answer:

the formula will be magnesium chloride

Answer:

21

Explanation:

........................

Answer: 21

Explanation:

Answer:

Newton's second law of motion is F = ma, or force is equal to mass times acceleration.

Explanation:

Answer:

F= m x a

force = mass x acceleration

Explanation:

The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased.

In simple terms, quantitative properties are properties that can be measured or quantified, such as size, mass, and volume. These properties are often expressed as numbers or numerical values, and can be compared and contrasted using mathematical operations such as addition, subtraction, multiplication, and division.

Qualitative properties, on the other hand, are properties that cannot be measured or quantified. These properties are often described using adjectives or other non-numerical descriptors, and they cannot be compared or contrasted using mathematical operations. Examples of qualitative properties include color, texture, and odor.

Overall, quantitative properties are properties that can be measured or quantified, while qualitative properties are properties that cannot be measured or quantified. These two types of properties are often used in scientific research and analysis to describe and compare different materials, substances, or phenomena.

Answer:

Benzoic acid= 37.16%

Naphthalene = 24.43%

3-Nitroaniline= 29.38%

Explanation:

Data given:

percentage recovery of benzonic acid = 9.75/26.24 * 100 = 37.16%

Percentage recovery of napthalene = 6.41/26.24 * 100 = 24.43%

Percentage recovery of 3-nitroaniline = 7.71/26.24 * 100 = 29.38%

The capacity of the electronegative leaving group to activate the carbonyl is connected to the relative reactivity of carboxylic acid derivatives toward nucleophile replacements. The carbonyl's electron density was taken from it by the more electronegative leaving groups, enhancing its electrophilicity.

ROCl (Acid Chloride) is the most reactive derivative of carboxylic acid.

The substituent becomes more electrophilic and reactive if it is electron withdrawing.

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Answer:

Salt is effective as a preservative because it reduces the water activity of foods. .

Answer: Chemical change

Explanation: Chemical change because when you add baking soda, a chemical reaction is happening. I hope this helps :)

Esters, amines, and amides have many uses in medicine, and so do carboxylic acids, such as aspirin. Aspirin is the drug that will be investigated further. Its scientific name is acetylsalicylic acid.

Acetylsalicylic acid contains two functional groups: a carboxylic acid group (-COOH) and an ester group (-COO-CH₃). The carboxylic acid group is responsible for the acidic properties of aspirin and allows it to form salts with bases. The ester group is formed from the reaction between the carboxylic acid group of salicylic acid and acetic anhydride. This esterification reaction makes aspirin more soluble in organic solvents and less irritating to the stomach than salicylic acid.

Aspirin is a widely used medication that has anti-inflammatory, analgesic, and antipyretic properties. It works by inhibiting the production of prostaglandins, which are responsible for pain, inflammation, and fever. Aspirin is commonly used to treat headaches, fever, arthritis, and other inflammatory conditions. It is also used as a blood thinner to prevent heart attacks and strokes.

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The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.

a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:

Volume of CO₂ = Volume of balloon = 765 L (at STP)

Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP

                                          = 765 L / 22.4 L/mol

                                          = 34.15 mol

Mass of CO₂ = 34.15 mol x 44.01 g/mol

                       = 1501.17 g

Total mass of balloon and its content = 20 g + 1501.17 g

                                                               = 1521.17 g

b) Number of moles of CO₂ in the balloon is 34.15 mol

c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).

Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number

                                           = 34.15 mol x 6.02 x 10²³ molecules/mol

                                           = 2.06 x 10²⁵ molecules

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The empirical formula : CaAsO₄H

The empirical formula is the smallest comparison of atoms of compound =mole ratio of the components

The principle of determining empirical formula

\(\tt \dfrac{22.3}{40.078}=0.556\)

\(\tt \dfrac{41.6}{74.9246}=0.555\)

\(\tt \dfrac{35.6}{15.9994}=2.225\)

\(\tt \dfrac{0.56}{1.00794}=0.556\)

Divide by the smallest ratio(0.555) :

Ca : As : O : H ⇒

\(\tt \dfrac{0.556}{0.555}\div \dfrac{0.555}{0.555}\div \dfrac{2.225}{0.555}\div \dfrac{0.556}{0.555}=1\div 1\div 4\div 1\)

(a) Because acid is caustic, dolphins can perish from exposure to it. Acids are compounds that give other things protons (H+). Acid can react with the proteins and lipids in dolphins' skin when they come into touch with it, leading to chemical burns and damage to the underlying tissue. Systemic consequences from this include death.

(b) Because chlorine is a potent oxidizer, it interacts with red-hot iron powder to produce Iron(III) chloride (FeCl3) rather than Iron(II) chloride (FeCl2). FeCl3 is created when chlorine at high temperatures rapidly accepts electrons from iron atoms. Contrarily, iron interacts with HCl, a less potent oxidizer than chlorine, to produce FeCl2.

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Answer:

Option C

Explanation:

Consider the ionic equation of this chemical equation. We are given barium chloride and silver nitrate as the reactants, and silver chloride and barium nitrate as the products. We can thus conclude that the ionic equation ( not balanced yet ) should be as follows -

Ba( 2 + ) + Cl ( - ) + Ag ( + ) + NO3 ( - ) ------> AgCl + Ba( 2 + ) + NO3( - )

As you can see these compounds are present in aqueous solutions, and are thus dissociated.

______________________________________________________

Now let us take a look at the number of elements on the reactant and product sides, and balance this chemical equation out -

Ba( 2 + ) + 2Cl ( - ) + 2Ag ( + ) + 2NO3 ( - ) ------> 2AgCl + Ba( 2 + ) + 2NO3( - )

Solution = Option C!

The statement that correctly describes the quantum number n is, "an electron with n = 2 is at a higher energy level than any other energy levels.

Generally, the set of numbers that is used to locate the position and energy of the electron in an atom are known as quantum numbers. Basically, there are four types of quantum numbers, which are named as, principal, azimuthal, magnetic and spin quantum numbers.

In any atom, there are a total of four quantum numbers: the principal quantum number (n), the orbital angular momentum quantum number (l), the magnetic quantum number (ml), and the electron spin quantum number (ms) which generally describes the characteristic properties of an atom.

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We can actually deduce here that the purpose of this assignment is to teach students about decomposition reactions and allow them to determine the percent yield.

By performing the experiment, students will gain a better understanding of the concepts involved and how they relate to their overall learning.

The specific focus of this assignment is the decomposition of sodium bicarbonate (NaHCO3) to produce sodium carbonate (Na2CO3), water (H2O), and carbon dioxide (CO2). The unbalanced chemical equation for this reaction is:

NaHCO3 (s) + heat -> Na2CO3 (s) + H2O (g) + CO2 (g)

To understanding the reaction itself, students will also learn about the concept of percent yield. Percent yield is a measure of the efficiency of a chemical reaction and is calculated by dividing the actual yield of the desired product by the theoretical yield, then multiplying by 100.

This calculation allows students to assess how well the reaction proceeds in terms of producing the expected amount of sodium carbonate.

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The fisrt step is to look at the expected solubility of NaCl in water. The expected solubility, at 25°C, is 35.9 g/100 ml, which means we expect 35.9 g of NaCl to be dissolved in 100ml of water. To make things easier, we can work with a water volume of 100ml.

The next step is to fill the beaker with a 100 ml of water, registering the room temperature (probably very close to 25°C). Then we can weight some amount of NaCl and add it to the beaker while stirring, untill all NaCl is dissolved.

We should do this until we reach the point that some NaCl is left at the bottom of the beaker. This means we have reached the solubility at that temperature.

We can proceed with the experiment by increasing the temperature. It's always good to increase it the same amount. Let's say we increase it from 25°C to 30°C. We will then do the same thing: weight some amount of salt, add it to the beaker and stirr. When we reach the point that some NaCl is left at the bottom again, we know its solubility in 30°C.

We can do this for several temperatures, and then construct a graph relating temperature and solubility. What we expect is that the solubility of NaCl will increase with temperature, as the blue curve in the graph below shows.

To set the experiment, we will use the Bunsen Burner to warm up the beaker with water over the tripod. The thermometer will be used to control the temperature whenever needed. The scale will be used to measure the amount of NaCl that is being dissolved in water (we measure it before we put it in the beaker).

Answer:

where is the table..............

Answer:

B

Explanation:

I just took the test.

The final temperature of the water is: T_final = 45.0°C

We can use the formula for the specific heat capacity of the water to solve this problem:

q = mcΔT

First, we can calculate the initial energy of the water:

q = mcΔT

q = (10.0 g) (4.184 J/g°C) (25.0°C)

q = 1,046 J

Next, we can calculate the final temperature after absorbing 840 J:

q = mcΔT

840 J = (10.0 g) (4.184 J/g°C) (ΔT)

ΔT = 20.0°C

Therefore, the final temperature of the water is:

T_final = T_initial + ΔT

T_final = 25.0°C + 20.0°C

T_final = 45.0°C

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The answer is True

Explanation:

Hope this helps

The amount of 0.303N NaOH needed to neutralize a 13.0 ml sample of acid is 37,3 ml. Acid is 0.823N normal, according to the standard.

The idea of neutralization, according to which an acid reacts with a base to create salt and water. By comparing the molarity of the base to the amount of base needed for neutralization, it is possible to calculate the molarity of the acid. Once the molarity and the acid's valence (or charge) have been multiplied, the acid's normalcy can be determined.

By deducting the volume of NaOH (37.3 ml) from the volume of the acid sample in Step 1, you can calculate the amount of acid that was utilized in the neutralization procedure (13.0 ml).

Consequently, 13.0 ml to 37.3 ml

= -24.3 ml

Use the equation moles = normality x volume to determine the number of moles of acid that were used in the process.

Consequently, moles equal 0.303N x -24.3 ml.

= -7.33 moles

Determine the acid's normality by multiplying the volume by the formula normalcy = moles.

As a result: normalcy = -7.33 moles / 13.0 ml

= -0.823N

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If more energy is absorbed than what is released during bond breaking and forming, the reaction is endothermic.

When bonds in the reactants are broken in endothermic reactions, greater energy is absorbed than emitted when new bonds are created in the products.

The energy required to break existing bonds in endothermic processes is more than the energy released when new bonds are generated. In an exothermic process, more energy is generated when new bonds are created than is consumed when old ones are broken.

If more energy is absorbed than what is released during bond breaking and forming, the reaction is endothermic.

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Approximately 60.9% of the total energy in 2005 came from fuels that emitted greenhouse gases. This signifies a significant contribution to global greenhouse gas emissions and highlights the importance of transitioning to cleaner and more sustainable energy sources to mitigate climate change impacts.

To determine the total percent of energy that came from fuels emitting greenhouse gases, we need to consider the energy sources listed in the chart that are known to produce greenhouse gas emissions. In this case, those would be oil, natural gas, and coal.

From the chart, we see that the percentages for these three energy sources are:

Oil: 37.9%

Natural gas: 23%

Coal: Not specified

Although the percentage for coal is not mentioned in the given information, it is a known fact that coal combustion releases greenhouse gases, including carbon dioxide (CO2). Therefore, we can assume that coal is among the fuels emitting greenhouse gases.

Adding up the percentages for oil and natural gas, we have:

37.9% (oil) + 23% (natural gas) = 60.9%

Therefore, approximately 60.9% of the total energy in 2005 came from fuels that emitted greenhouse gases. This signifies a significant contribution to global greenhouse gas emissions and highlights the importance of transitioning to cleaner and more sustainable energy sources to mitigate climate change impacts.

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Answer:

≈194.7

Explanation:

(547cm^3/590K) / (V2/210K)

V2 = 194.69 or 194.7

:D

These two compounds are diastereomers. As stereoisomers that are not mirror reflections of one another, stereoeomers differ from one another in terms of their physical and chemical characteristics.

In this instance, the two compounds have identical atom connectivity, but they differ in how their substituents are arranged spatially around one or more chiral centres.

The chiral carbon is covered by the identical substituents in both molecules, but in a different arrangement. In contrast to compound 2, which has an ethyl group pointing to the lower left and a methyl group pointing up, compound 1 has a hydrogen atom pointing to the lower left and a methyl group pointing up. Because of the differences in how the molecules are arranged spatially around the chiral carbon, the compounds have unique physical and chemical characteristics.

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Answer:

1. If an organism has high biological fitness in one habitat, this does not mean it will have high fitness in another. This is because organisms adapt accordingly to their environment. Therefore, since there is variability among habitats, this does not guarantee that the organism will always have high biological fitness.

2. Natural selection produces changes in populations. Individual organisms are directly impacted by it, as it determines their survival rate, but the only genetic changes would occur in a population.

3. If there are no organisms with varying traits in a population, they will likely go extinct after a major environmental change. This is because natural selection will remove all organisms who are unable to survive in the new environment. If the population does not have the variability to survive this, then they will go extinct.

If an organism has a high biological fitness in one habitat, then it doesn't guarantee a high biological fitness in a different habitat; natural selection does change the individual. The population will go extinct if the individuals can't reproduce.

The individual that lives in an ecosystem can change itself due to natural selection, as natural selection favors the individuals who can survive in the changing environment, and the change in the environment induces the change in the organism. There is no reproductive success if the organisms are reproductively isolated within the population.

Hence, if an organism has a high biological fitness in one habitat, it doesn't guarantee a high biological fitness in a different habitat; natural selection does change the individual. The population will go extinct if the individuals can't reproduce.

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Answer:

x/2

Explanation:

X = 2 molecules of H2

For 2 molecules of H2, there's only 1 molecule of O2. Meaning, there's twice the amount of H2, so O2 = x/2 molecules.

I hope I'm understanding this question right.

To determine the entropy changes for a chemical reaction; we have seen that the energy given off (or absorbed) by a reaction, and monitored by noting the change in temperature of the surroundings, can be used to determine the enthalpy of a reaction (example by using a calorimeter).

Changes in internal energy, that are not accompanied by a temperature change, might reflect changes in the entropy of the system. For eg., a change in entropy associated with the Haber process for the production of ammonia from nitrogen and hydrogen gas.

N₂(g) + 3H₂(g) --- 2NH₃(g)

At 298K as a standard temperature:

S°(NH₃) = 192.5 J/molK

S°(H₂) = 130.6 J/molK

S°(N₂) = 191.5 J/molK

Solution,

From the balanced equation we can write the equation for ΔS°(the change in the standard molar entropy for the reaction):

ΔS° = 2*S° (NH₃) - [S°(N₂) + (3*S°(H₂)]

ΔS° = 2* 192.5 - [191.5 + (3*130.6)]

ΔS° = -198.3 J/molK

It would appear that the process results in a decrease in entropy i.e. a decrease in disorder. This is expected because we are decreasing the number of gas molecules.

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