which of these changes are endothermic and which are exothermic

baking a cake
bending a plastic ruler
cutting paper
melting ice cream
ripening of fruit
souring of milk

Answers

Answer 1

Answer:

exothermic - bending a plastic ruler , cutting paper, melting ice cream, ripening of fruit, souring of milk.

Explanation:

endothermic- baking of cake .

Answer 2
Exothermic is all of them besides baking a cake that’s endothermic

Related Questions

b) Explain what happens when a drop of concentrated sugar solution is placed on a rheo leaf peel mounted on a glass slide. Name this phenomenon. Would the same happen if the rheo leaf was boiled before mounting? Give reason for your answer

Answers

The rheo leaf peel will lose water by osmosis and become flaccid. If the rheo leaf was boiled, this would not happen.

What is osmosis?

Across living membranes, water moves from a region of high to a region of low water potential.

Concentrated sugar solutions have low water potential when compared to the cell sap of the cells of rheo leaf peel. Thus, water will move from the rheo leaf peel to the sugar solution.

This will result in the wilting of the leaf peel.

If the leaf peel is boiled, the membranes in the cells die and can no longer function as a selectively permeable interface.

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Arrange these elements into a table showing metals and non-metals: phosphorus, P, barium, Ba, vanadium, V. mercury, Hg, krypton, Kr, potassium, K, and uranium, U.​

Answers

...,...................................

You are trying to determine the
freezing point for a 0.195 m
baqueous solution of K₂S.
How many particles does K2S
dissociate into?

Answers

From the equation; there are three particles in solution.

What is freezing point?

The term freezing point is the temperature at which a liquid substance is converted to solid. We know that this is colligative property thus it depends on the number of particles in solution.

The dissolution of K₂S gives us;

K₂S(s) ----> 2K^+(aq)  + S^2-(aq)

This implies that there are three particles in solution.

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Scientists used alpha particles to investigate models of the atom. Figure 4 shows an alpha particle scattering experiment.

Explain how scientists used the results from the experiment to :

disprove the plum pudding model
give evidence for the new nuclear model​

Answers

Answer:

See attached image.

Explanation:

The products of __________ combustion are carbon monoxide, carbon and water. what one word completes this sentence?

Answers

Answer:

Complete combustion

Explanation:

To solve such this we must know the concept of combustion reaction. Therefore the products of complete combustion are carbon monoxide, carbon and water.

What is chemical reaction?

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.

There are so many types of chemical reaction reaction like combustion reaction, acid base reaction, double displacement reaction, combustion reactions. The products of complete combustion are carbon monoxide, carbon and water. Large amount of heat is also released in combustion reaction

Therefore the products of complete combustion are carbon monoxide, carbon and water.

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For the function F(x) = 1, which of these could be a value of F(x) when x is
close to zero?

Answers

Answer:

A.  -10,000

Explanation:

When x approaches zero, the graph tells us that F(x) either becomes extremely large or extremely small.  The best answer is therefore A:  -10,000.  Best, because we aren't given the exact value of x, but clearly the other results require that x be greater than 1 or less than -1, which is far from zero.

N₂ + 3H2 → 2NH3
224 L of nitrogen reacts with
excess hydrogen at 2773 K and
95 atm, using up 93.5 mol N2.
How many moles of ammonia
form?

Answers

Answer:

187 moles NH₃

Explanation:

To find the amount of ammonia formed, you need to multiply the given value by the mole-to-mole ratio consisting of both relevant molecules. The mole-to-mole ratio is made up of the molecules' coefficients in the balanced equation. The desired unit should be placed in the numerator of the ratio. The final answer should have 3 sig figs to reflect the lowest amount of sig figs among the given values.

1 N₂ + 3 H₂ ----> 2 NH₃
^                         ^

93.5 moles N₂          2 moles NH₃
----------------------  x  -------------------------  =  187 moles NH
                                    1 mole N₂

How many moles of CF4 can be produced when 8.95 mol C reacts with 7.88 mol F2?
How many moles of each reactant are left over? (Note that at least one of the reactants must disappear.)
C remaining
mol
F2 remaining
mol

Answers

The remaining moles of C is 5.01 moles while the remaining moles of F₂ is 0.

Reaction between Carbon and Fluorine

The reaction between carbon and Fluorine is given as;

C + 2F₂  -------> CF₄

1  :    2                1

from the reaction above,

2 moles of F₂ requires 1 mole of C

7.88 mole of  F₂ will require:    7.88/2 = 3.94 moles of C and 3.94 moles of CF₄.

The remaining moles of C = 8.95 - 3.94 = 5.01 moles while the remaining moles of F₂ is 0.

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A+gas+at+250k+and+15atm+has+a+molar+volume+12%+less+than+the+perfect+gas+law+character. +calculate+the+compressibility+factor

Answers

The compression factor based on the information given is 0.083.

How to calculate the compression factor?

The way to calculate the compression factor goes this:

V(ideal) = RT/P

= (0.0821 × 250)/15

= 1.368

V(real) will be:

= V(ideal)/12

= 1.368/12 = 0.114

The compression factor will be:

= 1.368/(12 × 1.368)

= 0.083

Therefore, the compression factor is 0.083.

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According to Le Châtelier's principle, an increase in temperature will shift the equilibrium position toward the products in an endothermic reaction.

True

False

Answers

The statement "According to Le Châtelier's principle, an increase in temperature will shift the equilibrium position toward the products in an endothermic reaction" is definitely true.

What is Le Châtelier's principle?

Le Châtelier's principle may be defined as transformations in the temperature, pressure, volume, or concentration of a system that will lead to observable and conflicting changes in the strategy in order to accomplish a refreshed equilibrium state.

According to Le Châtelier's principle, an increase in temperature generates the equilibrium to move in the direction of the product of the endothermic reaction, and the decrease in the temperature rationales the equilibrium to move in the direction of the product of the exothermic reaction.

Therefore, it is well described above.

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Solid aluminum and oxygen gas react to form solid aluminum oxide. Suppose you have 3.0 mol of Al and 11.0 mol of O2 in a reactor. Suppose as much as possible of the reacts. How much will be left? Round your answer to the nearest 0.1 mol.

Answers

8.75 moles of oxygen will be left

The reaction is

Al(s) + O₂(g) -----> Al₂O₃(s)

On balancing the equation, we get:

4Al(s) + 3O₂(g) -----> 2Al₂O₃(s)

If 3 mol of Al reacts, we need 3/4 x 3 = 9/4 = 2.25 mol of oxygenIf 11 mol of oxygen reactions, we need 11/3 x 4 = 44/3 = 14.7 mol of AluminiumBut we only have 3 mol of AlAluminium is the limiting reagent and all 3 moles of Al will react

We get 2 moles of aluminium oxide from 4 moles of aluminium. So from 3 moles of aluminium, we get:

                      3/4 x 2 = 6/4 = 1.5 moles of aluminium oxide

If we use 4 moles of Al, we need 3 moles of oxygenSo when we use 3 moles of Al,  we need

                      3/4 x 3 = 9/4 = 2.25 mol of oxygen

We had 11 moles of oxygenThe amount of oxygen left = 11-2.25 = 8.75 mol

8.75 moles of oxygen will be left

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Which particles that make up an atom are involved in nuclear reactions?.

Answers

Basically nuclear reactions need to involve protons and neutrons and changes in them. So it should be particles within the nucleus. Aka protons and neutrons.

Which quantity is held constant for Boyle's law, Gay-Lussac's law, and Charles's law?

volume

mass

temperature

pressure

Answers

Boyle's law: in Boyle's law, pressure of a gas in inversely proportional to the volume while the temperature is shield constant

Temperature

Gay-Lussac's law: In Gay-Lussac's law, pressure of a gas in directly proportional to the temperature while the volume is held constant.

Volume

Charles's law: In Charles's law, the volume of a gas is directly proportional to the temperature while the pressure is held constant.

Pressure

Scientists are trying to find out why bees are dying in large numbers. Which best describes how the scientists will try to solve the problem?
A. They will do the same experiments to obtain similar evidence.
B. They will only work with scientists who share the same opinions.
C.
They will observe the same patterns and draw the same conclusions
D.
They will approach the problem in different ways but share ideas. ​

Answers

Answer: D. They will approach the problem in different ways but share ideas.

Does this equation show that transmutation has taken place during decay? why or why not?

61/28 ni=61/28 ni + y

a. yes, because the numbers of nucleons and atoms are conserved

b. no, because high-energy electromagnetic waves are emitted

c. no, because there is conservation of the number of atoms as well as the number of nucleons

d. yes, because nickel atoms remain nickel atoms with the same number of neutrons

Answers

The equation is not a transmutation because there is conservation of the number of atoms as well as the number of nucleons; option C.

What is transmutation?

Transmutation refers to the artificial synthesis of new elements by a nuclear reaction of the original element and nuclear particles.

In transmutation, a new element is formed and the atomic number changes.

Based on the above, it can be concluded that the given equation is not a transmutation because there is no change in atomic and nucleon number.

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what is electron
and the unit​

Answers

Electron is a negatively charged subatomic particle. It orbits the shells of an atom.

Please select the word from the list that best fits the definition

Rock that is formed from the remains of older rocks and organisms

Super position
Radioactive dating
Sedimentary
Igneous
Metamorphic
Rock Cycle

Answers

Answer is Sedimentary Rock
Explained

Sedimentary rocks are formed from layers of eroded rocks, sand, silt, dead plants, and animal skeletons.

eggs do not contain sugar. Explain why they have such high energy values.​

Answers

Answer:

becuz they have protien inside them dumy its easy

Answer:

because they have protein inside them dummy its easy therefore they did not have sugar

Explanation:

write the transitional metals and their electronic configuration​

Answers

Answer:

yo no se nada

Explanation:

solo se que no se nada xd

Help!!!!!!!!!!!!!!!!

Answers

Answer:

the mixture two is the Heterogeneous solution and the mixture 1 (sugar solution) is true solution

Explanation:

Heterogeneous solutions are solutions with non-uniform composition and properties throughout the solution. A solution of oil and water, water and chalk powder and solution of water and sand, etc.

True solution

The sugar solution is a mixture of sugar and water which is a true solution. True Solution is a homogeneous mixture of two or more materials with a particle size of less than 10-9 m or 1 nm dissolved in the solvent.

A solute is a substance to be dissolved.

The solvent is the one in which solute is dissolving.

In the sugar solution sugar is the solute and water is the solvent.

Answer:

Explanation:

your cool

work out the size of resistance.​

Answers

Answer:

Step 1: Identify the resistivity (ρ) , length (L), and radius (r) of the wire. Step 2: Calculate the cross-sectional area of the wire using the formula for the area of a circle: A=πr2 A = π r 2 . Step 3: Calculate the resistance (R) of the wire using the formula for resistance: R=ρLA R = ρ L A

Calculate the root mean square velocity of I2(g) at 373 K.

Answers

From the calculations, the root mean square speed is 6.1 m/s.

What is the root mean square speed?

The root mean square speed of a gas is obtained by the use of the formula;

V rms = √3RT/M

Where;

R = gas constant

T = temperature

M = molar mass

V rms =√3 * 8.314 * 373/254

V rms =6.1 m/s

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Which word equation best describes the following formula equation:

4Al+3O2→2Al2O3?

A. Four molecules of aluminum and three molecules of diatomic oxygen react to form two molecules of aluminum oxide.
B. Four molecules of aluminum react with six molecules of oxide to form twelve molecules of aluminum oxide.
C. Two molecules of aluminum oxide reacts to form three molecules of oxygen and four molecules of aluminum.
D. Aluminum reacts with oxide to form aluminum oxide.

Answers

Option A is the correct answer that describes the equation best as compared to other statement.

Which statement best describes the equation?

Four molecules of aluminum and three molecules of diatomic oxygen react to form two molecules of aluminum oxide is the statement best describes the equation because this statement have same number of molecules that reacted in the equation. We considered an equation correct that have wrong numbers in front of atoms.

4Al+3O2------------>2Al2O3

So we can conclude that option A is the correct answer that describes the equation best as compared to other statement.

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Which would be a good use for an organic substance? Check all that apply. A. Electrical conductors B. Waterproof coatings C. Fuels such as gasoline D. Microchips E. Plastic storage containers

Answers

Answer:

B. waterproof coating

Explanation:

please mark me brainlist

A 2. 75-l container filled with co2 gas at 25°c and 225 kpa pressure springs a leak. When the container is re-sealed, the pressure is 185 kpa and the temperature is 10°c. How many moles of gas were lost?.

Answers

Answer:

Moles Lost = 0.0335 moles

Explanation:

This type of question requires the Ideal Gas Law equation. The equation looks like this:

PV = nRT

In this formula,

-----> P = pressure (kPa)

-----> V = volume (L)

-----> n = number of moles

-----> R = constant (8.314 L*kPa/mol*K)

-----> T = temperature (K)

(Step 1)

To find how many moles were lost, you first need to find how many moles you had to begin with. This can be done by plugging the starting values into the equation and solving for "n". But first, you need to convert Celsius to Kelvin (by adding 273.15).

P = 225 kPa                  R = 8.314 L*kPa/mol*K

V = 2.75 L                     T = 25°C + 273.15 = 298.15 K

n = ?

PV = nRT

(225 kPa)(2.75 L) = n(8.314 L*kPa/mol*K)(298.15 K)

618.75 = n(2478.8191)

0.250 = n

(Step 2)

Next, you need to find the number of moles in the container after it has been re-sealed. The volume is the same because the container did not change. The process should be the same as above.

P = 185 kPa                   R = 8.314 L*kPa/mol*K

V = 2.75 L                     T = 10°C + 273.15 = 283.15 K

n = ?

PV = nRT

(185 kPa)(2.75 L) = n(8.314 L*kPa/mol*K)(283.15 K)

508.75 = n(2354.1091)

0.216 = n

(Step 3)

Finally, you can find the number of moles lost by subtracting the final amount of moles from the original amount. When doing this calculation, I used the value of the moles saved in my calculator (with more decimal places) to get a more accurate number.

Moles Lost = Initial Moles - Final Moles

Moles Lost = 0.250 moles - 0.216 moles

Moles Lost = 0.0335 moles

deduce the molecular formula of hydrogen 18.2%, carbon 81.8%, relative molecular mass is 44​

Answers

Answer:

let number of carbon is an

Explanation:

hence 12 and + 2n is equal to 126

14 and is equal to 126

n is equal to 9

A compound has an empirical formula C₂H4S.
What is its molecular formula, if its molar
mass is 168 g/mol?

Answers

The atomic mass of carbon is 12.011 g/mol.The atomic mass of hydrogen is 1.00794 g/mol.The atomic mass of sulfur is 32.06 g/mol.

This means that the molar mass of [tex]\text{C}_{2}\text{H}_{4}\text{S}[/tex] is

[tex]2(12.011)+4(1.00794)+32.06=60.11376[/tex]

Dividing this by the given molar mass, we get [tex]\frac{168}{60.11376} \approx 3[/tex]

So, the molecular formula is about [tex]\boxed{\text{C}_{6}\text{H}_{12}\text{S}_{3}}[/tex]

if the maximum temperature for a particular day is 20°c and the minimum temperature is 10°c, the daily mean would be:

Answers

The daily mean, given the data from the question is 15 °C

Data obtained from the questionMaximum temperature = 20 °CMinimum temperature = 10 °CMean = ?

How to determine the daily mean

Mean = Sumation of data / Number of data

Mean = (20 + 10) / 2

Mean = 30 / 2

Mean = 15 °C

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Which is not a characteristic of a compound?

has different properties from its component elements
different samples have different properties
can be represented by a chemical formula
a pure substance made of two or more elements

Answers

The second answer is not a characteristic because compounds don’t vary from sample to sample. For example NaCl (table salt) is indistinguishable from sample to sample.

In an endothermic reaction products are _____ in potential energy and _____ stable than reactants.

higher; more

lower; more

higher; less

lower; more

Answers

In an endothermic reaction, products are higher in potential energy and  less stable than reactants.

What is an endothermic reaction?

Endothermic reactions are those reactions that do not release heat but absorb heats, that's why the products are of higher potential energy and due to this they are less stable.

Thus, the correct option is C, higher; less.

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