How much heat is required to change 35.0 g of water from ice to liquid water?
The following information for water is given, but may or may not be useful:
C = 4.184 J/g°C
AHfus = 334 J/g
AHvap=2260J/g

Answers

Answer 1

Taking into account the definition of calorimetry and latent heat, 11,690 J is required to change 35 g of water from ice to liquid water.

Definition of calorimetry

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

Definition of sensible heat

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

Definition of latent heat

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

Heat to change water from ice to liquid water

In this case, you know:

Q= ?m= 35 gL= ΔHfus= 334 [tex]\frac{J}{g}[/tex] because the change consists of changing from a solid (ice) to a liquid phase (liquid water).

Replacing in the definition of latent heat:

Q = 35 g× 334 [tex]\frac{J}{g}[/tex]

Solving:

Q= 11,690 J

Finally, 11,690 J is required to change 35 g of water from ice to liquid water.

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Related Questions

A scientist is working with a new kind of quantum dot to
make a dye. He is applying Newton's laws to the
particle, but it seems to be breaking these laws of
physics.
Which action will most likely help the scientist study
the particle's motion?

Answers

The action that will most likely help the scientist study the particle's motion is that He needs to use quantum mechanics, not Newtonian mechanics because this is a nanotechnology product.

What is Quantum Mechanics?

This refers to the branch of mechanics that has to do with the description of motion and the different concepts of quantization of energy

Hence, we can see that based on the fact that a scientist uses a new quantum dot to make a dye and uses Newton's laws, but he seems to be breaking the laws, so he needs to use quantum mechanics because this is a nanotechnology product.

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A compound has the formula X2Fe(CN)6 ∙ 12H2O, where X is an unknown element. [3]
If the compound is 45.34% water by mass, what is the identity of element X?

Answers

The element X from the calculation is Cs.

What is the identity of element X?

We have in the question the percentage by mass of water as  45.34% thus we can write;

45.34% = 12(H20)/2(X) + Fe + 6(CN)

Hence;

45.34/100 = 12(18)/2X + 56 + 6(26)

0.45 = 216/2X + 56 + 156

0.45 = 216/2X + 212

0.45(2X + 212) = 216

0.9X + 95.4 = 216

X = 216 -  95.4/0.9

X = 134

The element X from the calculation is Cs.

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what are the relevant equations for oxidation and reduction

Answers

Answer:

There are many equations for oxidation and reduction, but the most relevant ones are the equations for the half-reactions. In general, the equation for oxidation is:

Oxidation: Reducing Agent + O2 → Oxidizing Agent

And the equation for reduction is:

Reduction: Oxidizing Agent + e- → Reducing Agent

These equations show the transfer of electrons that occurs during oxidation and reduction.

Explanation:

4Al(s) + 30₂(g) → 2Al2O3 (s)
How many molecules of O₂ are used in the reaction?
How many oxygen atoms are required?
How many moles of Al2O3 are formed?
What is the mole ratio of Al to O₂?

Answers

1) 1 molecules
2) 2 oxygen atoms
3)2 moles of Al2O3 are formed
4)4:3

Question 5
Which of the following molecules is carrying oxygen in circulating erythrocytes?
O Memeglobin
O Hemoglobin
O Stemoglobin
O Myoglobin
Question 6

Answers

O Hemoglobin

Explanation:

Hemoglobin (Heme + Globin) The protein hemoglobin is a molecule which is responsible for carrying almost all of the oxygen in the blood.

A scientist observes that the electrical resistance of a subconducting material drafts to zero when the material is cool to very low temperatures which is the following statements best describes what the scientist is observing

Answers

The statement that describes what the scientist is observing is; "the scientist is observing an intensive property of a superconductor."

What is electrical resistance?

The term electrical resistance refers to the opposition that is offered to the flow of  current. We know that a superconductor is one whose electrical resistance drops to zero when it s cooled to the absolute zero.

Hence, the statement that describes what the scientist is observing is; "the scientist is observing an intensive property of a superconductor."

Missing parts:

A scientist observes that the electrical resistance of a superconducting material drops to zero when the material is cooled to very low temperatures. Which of the following statements best describes what the scientist is observing?

The scientist is observing the electrical power of a superconductor.

The scientist is observing the temperature of a superconductor.

The scientist is observing an intensive property of a superconductor.

The scientist is observing an extensive property of a superconductor

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What is the change in temperature if 500 J of heat are added to a 23 g sample of silver? (Thespecific heat of silver is 0.24 J/g °C)

Answers

The change in temperature of silver if 500 J of heat are added to a 23 g sample of silver is 90.5°C.

How to calculate change in temperature?

The change in temperature of a substance can be calculated using the following formula:

Q = mc∆T

Where;

Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature

500 = 23 × 0.24 × ∆T

500 = 5.52∆T

∆T = 500 ÷ 5.52

∆T = 90.5°C

Therefore, the change in temperature of silver if 500 J of heat are added to a 23 g sample of silver is 90.5°C.

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The electron configuration of an element is 1s22s22p4.
Describe what most likely happens when two atoms of this element move toward each other.

Answers

The likely thing which happens when two atoms of this element move toward each other is covalent bonding.

What is Covalent bonding?

This involves the atoms of element sharing electrons in order to achieve a stable octet configuration.

The element is oxygen which has an atomic number of 8 and needs two electrons to complete its outermost shell which results in the formation of two covalent bonds.

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Complete combustion of a 17.12mg sample of xylene In oxygen yielded 56.77mg

Answers

Xylene moles =\frac{17.12}{106.16×1000}=0.00016moles=

106.16×1000

17.12

=0.00016moles

Moles of CO_2 =\frac{56.77}{44.01×1000}=0.0013CO

2

=

44.01×1000

56.77

=0.0013

Moles of H_2O= =\frac{14.53}{18.02×1000}=0.0008H

2

O==

18.02×1000

14.53

=0.0008

Moles ratios

\frac{0.0013}{0.0008}=1.625

0.0008

0.0013

=1.625

\frac{0.0008}{0.0008}=1

0.0008

0.0008

=1

Hence molecular fomula

The empirical formula is C 4H 5.

The molecular formula C8H10

what is the balanced hydration equation for Silicon phosphate

Answers

The balanced hydration equation for Silicon phosphate is as follows: Si3(PO4)4 + 6H2O → 3SiO2 + 4H3PO4.

What is hydration?

Hydration is the incorporation of water molecules into a complex with those of another compound.

According to this question, silicon phosphate with a chemical formula of Si3(PO4)4 is hydrated to produce silicon oxide and phosphoric acid as follows:

Si3(PO4)4 + H2O → SiO2 + H3PO4.

However, this equation is not balanced as the number of moles of each element on both sides is not the same. The balanced equation is as follows:

Si3(PO4)4 + 6H2O → 3SiO2 + 4H3PO4

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When preparing a pure and dry sample of ammonium chloride, we cannot dry the sample of ammonium chloride by evaporating it to dryness.

Answers

we cant

Explanation:

you need to leave some water to stop dehydration of substance

When preparing a pure and dry sample of ammonium chloride, we cannot dry the sample by evaporating it to dryness because ammonium chloride is a salt that decomposes upon heating.

When heated, ammonium chloride undergoes sublimation, which means it directly changes from a solid to a gas without passing through a liquid phase. This process would lead to the loss of the compound, and we would not be able to obtain a pure and dry sample.

Instead, other methods such as vacuum drying or desiccation are used to remove moisture from ammonium chloride without causing decomposition.

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Draw a heating curve for 1 mole of methanol beginning at 170K and ending at 350K. Assume that the values given here are constant over the relevant temperature ranges.

Answers

The graph of the heating of methanol has been attached.

The temperature at 170 K is approximately the melting point of methanol.

The temperature at 350 K is approximately the boiling point of methanol.

If we provide heat before 170 K temperature then all the heat provided to the methanol will result in rise in temperature of methanol in solid form.

If we provide heat at 170 K temperature then all the heat provided to the methanol will result in change in physical from of methanol from solid to liquid.

If we provide heat after 170 K temperature and before 350 K temperature then all the heat provided to the methanol will result in rise in temperature of methanol in liquid form.

If we provide heat at 340 K temperature then all the heat provided to the methanol will result in change in physical from of methanol from liquid to gas.

If we provide heat after 350 K temperature then all the heat provided to the methanol will result in rise in temperature of methanol in gas form.

So, the heat given to methanol will rise its temperature except at its Boiling and melting point. At those temperature heat will change the physical form of methanol first. and the graph also have been attached of between boiling point and melting point as given in question  .

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Compound found to contain 58.4% bromine. Which compound contains this % bromine by mass

Answers

Answer:

the compound is bromine trifluoride

Explanation:

it contains 58.37 as there is no compound with 58.4 bromine formula brf3

The compound to this is bromine trifluoride

How many kilograms of NH3 are needed to produce 120 of pf3 if the reaction has 78.1% yield.

Answers

99.25 grams = .09925 Kg of fluorine gas is needed.

What are moles?

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Balanced chemical reaction: P₄ (s) + 6F₂ (g) → 4PF₃ (g).

m(PF₃) = 120.0 g; mass of phosphorus trifluoride.

n(PF₃) = m(PF₃) ÷ M(PF₃).

n(PF₃) = 120 g ÷ 88 g/mol.

n(PF₃) = 1.36 mol.

From chemical reaction: n(PF₃) : n(F₂) = 4 : 6 (2 : 3).

n(F₂) = 1.36 mol · 3 / 2.

n(F₂) = 2.04 mol; amount of substance.

m(F₂) = n(F₂) · M(F₂).

m(F₂) = 2.04 mol · 38 g/mol.

m(F₂) = 77.52 g ÷ 0.781.

m(F₂) = 99.25 g.

Hence, 99.25 grams = .09925 Kg of fluorine gas is needed.

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How can we prevent land pollution?​

Answers

Answer:

1. Make people aware about the concept of Reduce, Recycle and Reuse.

2. Reduce the use of pesticides and fertilizers in agricultural activities.

3. Avoid buying packages items as they will lead to garbage and end up in landfill site.

4. Ensure that you do not litter on the ground and do proper disposal of garbage.

5. Buy biodegradable products.

6. Do organic gardening and eat organic food that will be grown without the use of pesticides.

7. Create dumping ground away from residential areas.

I hope it helps u

Why is the MO structure of NO+ different than that of N2? (the structure, not the number of electrons)

Answers

N2 is a homonuclear molecule and NO+ is a heteronuclear molecular ion hence the  MO structure of NO+ different than that of N2.

What is the molecular orbital?

The molecular orbital is formed by the combination of atomic orbitals. We should note that the number of molecular orbitals must be equal to the number of combining atomic orbitals.

Now we know that N2 is a homonuclear molecule and NO+ is a heteronuclear molecular ion hence the  MO structure of NO+ different than that of N2.

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60.0 kL of hydrogen at SATP (24.8 L/mol) is reacted with excess amount of nitrogen. The resulting
ammonia gas needs to be stored in a gas tank with a volume of 6.25 kL and under 2000 kPa of pressure.
What should the temperature regulator of the gas tank be set at?

Answers

The temperature regulator of the gas tank be set at 842.64 K

What volume of ammonia gas is produced by reacting 60.kL of hydrogen with excess nitrogen at SATP?

The volume of hydrogen ammonia produced is given by the mole ratio of the gases in the equation below:

3 H₂ + N₂ → 2 NH₃

The mole ratio is 2:3

Volume of ammonia produced = 2/3 * 60 kL = 40 kL

The temperature regulator value is determined using the general gas equation:

P₁V₁/T₁ = P₂V₂/T₂

T₂ = P₂V₂T₁/P₁V₁

P₂ = 2000 kPaV₂ = 6.25 kLT₁ = 273.15 KP₁ = 101.3 kPaV₁ = 40 kL

T₂ = (2000 * 6.25 * 273.15)/(101.3 * 40)

T₂ = 842.64 K

The temperature regulator of the gas tank be set at 842.64 K

In conclusion, the general gas equation is useful in determining gas volume, pressure and temperatures.

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How many atoms are present in 8.78 grams O2?

Answers

Moles of O_2

Given mass/Molar mass8.78/320.27mol

No of atoms

No of moles×Avagadro no0.27×6.023×10²³1.6×10²³atoms

Note the formula

[tex]\boxed{\sf No\:of\:atoms=No\:of\:moles\times Avagadro\:no}[/tex]

Find no of moles

[tex]\\ \tt{:}\dashrightarrow \dfrac{8.78g}{32g/mol}[/tex]

[tex]\\ \tt{:}\dashrightarrow 0.27mol[tex]

No of atoms

[tex]\\ \tt{:}\dashrightarrow 0.27\times 6.023\times 10^{23}[/tex]

[tex]\\ \tt{:}\dashrightarrow 1.6\times 10^{23}atoms[/tex]

What is the freezing point depression of an aqueous solution of 10.0g of glucose (C6H12O6) in 50.0g of water? [Kf for a water= 1.86°c/m, C=12, O= 16, H=1]

Answers

The freezing point depression is 2.1 °c.

What is freezing point?

The freezing point is the point that a liquid is converted to solid. Now we know that the freezing point is a colligative property.

Number of moles of glucose =  10.0g /180 g/mol =0.056 moles

Mass of water =  50.0g or 0.05 Kg

Molality of the solute = 0.056 moles/ 0.05 Kg = 1.12 m

The freezing point depression is obtained from;

ΔT = K m i

ΔT = 1.86°c/m *  1.12 m * 1

ΔT = 2.1 °c

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According to the following reaction, how many moles of oxygen gas are necessary to form 0.408 moles carbon dioxide?
C3 Hs (g) +502(g) → 3CO2(g) + 4H₂O(g)
mol oxygen gas

Answers

Answer:

2 molecules of oxygen are necessary

calc mL of radiator solution when 197 mL antifreeze is used to make a 25% (v/v) solution

Answers

The volume of the radiator solution formed with the 197 mL of antifreeze is 788 mL.

What is a percentage?

A percentage is given as the respective ratio of the quantity present with respect to others.

The solution of 25% v/v can be depicting the presence of a 25% volume of antifreeze in the radiator solution.

The volume of the radiator solution has 197 mL of antifreeze. The total volume of the solution suppose is x.

25% of x = 197 mL

25/100 * x = 197

x = 788 mL

The volume of the radiator solution formed with 25% v/v antifreeze is 788 mL.

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The sparse area surrounding a spiral galaxy is called its

Answers

Answer:

Halo

Explanation:

what are the rules guiding iupac nomenclature?​

Answers

Rules of iupac nomenclature are :-

Find and name the longest continuous carbon chain.

Identify and name groups attached to this chain.

Number the chain consecutively, starting at the end nearest a substituent group.

Designate the location of each substituent group by an appropriate number and name.

Explanation:

Hope it helps you!!

hat is used and produced in glycoloysis?
1.
2 Pyruvate
2.
2 ATP
a
3.
H2O
4.
4 ATP
5.
2 NADH
b
6.
glucose
a.
produced
b.
used

Answers

During glycolysis is used glucose, ADP and pyruvate and produce ATP, water and NADH.

What is glycolysis?

Glycolysis is the first step of cellular respiration by which glucose is used to generate energy in the form of ATP.

Cellular respiration has three sequential steps, i.e., glycolysis, the Krebs cycle and oxidative phosphorylation.

Glycolysis is the cellular respiration step that generates 2 net high energy ATP molecules and 2 reduced NADH.

In conclusion, glycolysis uses glucose, pyruvate and ADP to generate ATP, water and Nicotinamide adenine dinucleotides (NADH).

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Write out the recipe and list all the ingredients (including the measures) of your favorite dish.
Explain how the ingredients in this recipe cause one or more of the listed reactions.

Answers

The recipe for an omelet are:

Ingredients

1 EggSalt and pepper ( 1 tablespoon )Butter ( 1 tablespoon )

Recipe:

Turn on the heat and place a pan on it.Add butter to the pan.Crack the egg and whisk it properly.Add the whisked omelet onto the pan and stir.Add salt and pepper.

How to illustrate the information?

When we turn on the heat and place the pan, a heat transfer takes place and heat transfers from one body to another.

When we add butter to the pan, then the temperature of the pan was more than that of the butter.

Since the melting point of butter was less than the temperature of the pan, the the melting of butter takes place.

When we add the egg, the evaporation of the liquid present in the egg yolk and the egg white takes place.

These are the chemical reactions depicted.

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What is the conjugate base of CO3-2

Answers

The conjugate base of CO3-2 is hydrogen carbonate.

Meaning of Conjugate base

A conjugate base can be defined as a base that can be derived from another base by the reason of it loosing or gaining an electron.

Conjugate base are very similar because they both posses the same elements.

In conclusion, The conjugate base of CO3-2 is hydrogen carbonate.

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Please help iggghghbvvv

Answers

A) Y because the line is flat, not going up or down. So, constant or no change in population

B) A positive correlation with introduction to animal A (because population is going up or increasing)

C)

1.New predator (due to Animal A eating them, meaning more of their predators are eating them)

2. Lack of food or food availability due to competition (from Animal A, e.g. if they eat the same food)

3. Introduction to a new disease (from Animal A)

Hope this helps!

Differences between Minerals and ore minerals

Answers

Answer:

Minerals are naturally occurring inorganic solids with a crystalline structure and a definite range of chemical formula. Ores are concentrations of minerals in rock that are high enough to be economically extracted for use. All ores are minerals, but all minerals are not necessarily ores.

Hope its helpful!

Minerals are inorganic solids that develop in nature and have a crystalline structure as well as a specific spectrum of chemical formulas. Ores are areas of mineral concentration in rock that may be economically mined for use. Lodestone is one of the iron ores. The mineral known as ore is where metal is easily and affordably mined. The composition of ore is known. Minerals are naturally occurring metals that are found in the crust of the planet. Ores are minerals that can be utilized to profitably extract metal.

All of these tools are used for science but which tool is used specifically for earth science

Answers

Tools which are specifically used for earth science are Temperature Scales which are Celsius, Fahrenheit, and Kelvin.

Temperature tell us about how hot or cold a body is. Temperature is crucial in many disciplines of research, from physics to geology, as well as in most aspects of our daily lives.The temperature scale is a tool that is primarily utilised in Earth science. In metrology, the temperature scale is a mechanism for calibrating the physical quantity temperature.Alcohol, liquid crystal, and infrared radiation thermometers are the three types of thermometers (pyrometer).Celsius, Fahrenheit, and Kelvin are the three primary temperature scales. Temperature conversion equations are used to convert temperatures from one scale to another.At a single pressure and temperature known as the triple point, the three phases of water (ice, liquid water, and water vapour) may coexist.

So we can conclude that the temperature scales which is specifically Celsius, Fahrenheit, and Kelvin are specifically used for earth science.

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Why are carcinogens a concern to people?

Answers

Answer:

They have been found to cause cancer in humans meaning any release of carcinogens will increase, not decrease, CANCER RISK.

Explanation:

Certain chemicals, including benzene, beryllium, asbestos, vinyl chloride, and arsenic are known human carcinogens, meaning “they have been found to cause cancer in humans.” A persons risk of developing cancer depends on how much, how long, how often, and when they are exposed to these chemicals.

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