Please I need the answer asap
The specific heat of water is 4.184 J/g·K. How much energy must be added to 100.0 g of water to raise the temperature of water from 22.0 ºC to 90.0 ºC?


a. 2.84 kJ

b. 136 J

c. 28.4 kJ

d. 6800 J

hold the syringe downward,shake vigorously for sometime,and expel the bubbles through the needle using the syringe plunger. hold the syringe upright, provide a firm tap or flick to the barrel

Answer:

Partial pressure is proportional to the number of moles so: partial pressure = total pressure x mole fraction. Let's calculate total pressure first. We know the volume in liters and the temperature. We can also find the number of moles of each gas by conversion.Mar 25, 2019

Answer:

A: It is used for the phase change.

Explanation:

During a phase change, the heat added or realeased, the temperature remains constant and is used to be stored as potential energy.

Side Note: I hope this helps, feel free to let me know if you have any other questions :)

Answer:

What happens to the Energy added during a phase change my anwar would be B

The new volume of the ideal gas heated to the given values of temperature and pressure is 28.9 Litres.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

To calculate the new volume of the gas, we subtsitute our given values into the expression above.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

V₂ = P₁V₁T₂ / P₂T₁

V₂ = ( 5.16atm × 35L × 343K ) / ( 8.0atm × 268K )

V₂ = 61945.8LatmK / 2144atmK

V₂ = 28.9L

Therefore, the new volume of the ideal gas heated to the given values of temperature and pressure is 28.9 Litres.

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The accurate systematic name of the coordination compound is diaminodicyano platinum II.

A coordination compound is which contains a central metal atom or ion along with ligands in its coordination sphere. Some times, counterions may alaso be present to balance the charges.

The accurate systematic name of the coordination compound is diaminodicyano platinum II.

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The temperature of a 1.7379 mole of a gas with a pressure of 1.4948 atm and volume of 92.202 L is 965.69K .

The temperature of a given gas can be calculated using the ideal gas law equation:

PV = nRT

Where;

1.4948 × 92.202 = 1.7379 × 0.0821 × T

137.82 = 0.142T

T = 137.82 ÷ 0.142

T = 965.69K

Therefore, the temperature of a 1.7379 mole of a gas with a pressure of 1.4948 atm and volume of 92.202 L is 965.69K.

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Answer:

ionic bonding

Explanation:

it's ionic bonding while covalent bonding involves sharing

Answer:

Explanation:

Chemical and physical changes occur all around us all the time. These changes are essential parts of our daily lives, for example, digesting food, combustion, osmosis, and phase changes. However, a few of the chemical and physical changes that occur daily are harmful for the environment. This project introduces four physical/chemical changes that are related to the following environmental issues: plastic decomposition, global warming, effects of acid rain, and oil spills.

Answer:

A beta-particle (plus or minus)

THE ANSWER IS OPTION B.

B;SOIL FROM EROSION FILLS UP A POND

HOPE THIS HELP

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Answer:

C

Explanation:

If the enthalpy change (i.e. ΔH) of a reaction is negative, then the reaction releases heat and is hence exothermic.

Hence, our answer is C.

Conversely, if ΔH is positive, the reaction absorbs heat and is endothermic.

ΔH tells us nothing about the speed of the reaction.

While ΔH influences free-energy change (ΔG = ΔH - TΔS), we cannot predict the sign of ΔG given only ΔH (recall that a reaction is spontaneous if ΔG < 0).

Answer:

The study of rocks is called petrology.

The correct answer is B.

Explanation:

All the rocks present in the earth is present during ancient times during the formation of the earth's atmosphere.

Due to the presence in the upper surface of the earth, the color of the rocks is changed.

Hence, the correct answer is B Yes, if the sedimentary rock is moved below Earth’s outer layer and exposed to  energy from Earth’s interior, can melt into liquid rock and form igneous rock.

Answer:

The answer is C. Political push factor.

Explanation:

The answer is: " 480 mL of [2.50 M K₂SO₄] solution."

____________

Explanation:

Given :
1.20 mol K₂SO₄   ⇒   __?  mL __  of 2.50 M K₂SO₄  ;
____________
Note: 2.50 M  K₂SO₄ = 2.50 mol/ L ;

____________

1.20 mol  =  [tex]\frac{1 L}{2.50 mol}[/tex] ;

The units of "mols" cancel;  since "mol / mol = 1 ;

and we have:  " [tex]\frac{(1.20*1) L}{(2.50)} = [{\frac{1.20}{2.50}}] L = (0.480) L ;[/tex]  
 
 →  {Note: we want to keep the appropriate number of "significant figures"; so we write our answer:  "0.48 L" ;  as:  "0.480 L" .

 → Now, we want to solve for the number of "mL ("milliliters").
 →Note the exact conversion:   "1000 mL = 1 L ;

So:  ("0.480 L") * (1000) = " 480 mL of solution." → which is our answer.
____________
Hope this helps!

____________

Explanation:

Well,

Light travels approximately 1 foot per nanosecond or 186 miles per millisecond or 300,000 kilometers per second.

Hope this helps!

Answer:

1. Unpredictable

2. All

3. Epicenter

4. Tectonic

5. Seismic

6. Hot

7. Magma

8. Melt

9. High

10. Lava

Explanation:

An earthquake is unpredictable. When an earthquake occurs, the vibrations spread out in all directions from its center. The vibrations are most strongly felt at the epicenter and gradually diminish as they spread out. Earthquakes happen when the tectonic plates rub against each other, which makes the crust of the Earth shake. The energy from the seismic waves is so strong that it makes the crust of the Earth rumble, creating an earthquake. Volcanoes are formed when hot molten rock or magma deep underground oozes up to the surface of the Earth. They are also formed as one of the plates is pushed under the other as it is heated to a point where it begins to melt When high pressure

develops underground, the magma shoots up or erupts through a weak spot in the Earth's crust. When the magma reaches the surface of the Earth, it is called lava.

Answer:A

Explanation:Acids

Yan po ang tamang sagot

Answer:

A is the correct answer. I hope this helped

Answer:

It is used in medical research.

Explanation:

So its answer is trends in drug effectiveness

In the given question, epidemiological studies look into trends in statistics. The correct answer is option D.

Epidemiology is the study of how diseases spread and how to prevent them.

Epidemiologists use statistics to understand how diseases spread and how to prevent them from spreading further. They look at trends in:

Therefore, Option D. "Trends in statistics" is the correct answer.

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The amount of water that could we get if you started with 250.0 grams of hydrogen is 2,250 grams.

Moles (n) and mass of any substance are related to each other according to the given equation as:

n = W/M, where

W = given mass

M = molar mass

Given balanced chemical reaction is:

2H₂ + O₂ → 2H₂O

Moles of 250g of H₂ = 250g / 2g/mol = 125mol

From the stoichiometry of the reaction it is clear that,

2 moles of H₂ = produces 2 moles of H₂O

125 moles of H₂ = produces 125 moles of H₂O

Now mass of water will be calculated as:

Mass = (125mol)(18g/mol) = 2,250g

Hence required mass of water is 2,250 grams.

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Tribasic Potassium Phosphate + Calcium Nitrate = Tuite + Potassium Nitrate

2 moles of aqueous Tribasic Potassium Phosphate react with 3 moles of aqueous Calcium Nitrate to form 1 mole of solid Tuite and 6 moles of aqueous Potassium Nitrate

Reaction Type

Double Displacement (Metathesis)

Net Ionic Equation

2K3PO4 + 3Ca(NO3)2 = Ca3(PO4)2 + 6KNO3 might be an ionic equation. Calculate the net ionic equation for 2K3PO4(aq) + 3Ca(NO3)2(aq) = Ca3(PO4)2(s) + 6KNO3(aq).

Redox (Oxidation-Reduction) Reaction

K3PO4 + Ca(NO3)2 = Ca3(PO4)2 + KNO3 might be a redox reaction.

Reactants

Tribasic Potassium Phosphate - K3PO4

E340Iii E340(Iii) Potassium Phosphate Tripotassium Phosphate K3PO4 Molar Mass K3PO4 Oxidation Number

Calcium Nitrate - Ca(NO3)2

Saltpeter Lime Nitrate Lime Saltpeter Norge Saltpeter Norway Saltpeter Calcium Saltpeter Norwegian Saltpeter Anhydrous Calcium Nitrate Ca(NO3)2 Molar Mass Ca(NO3)2 Oxidation Number

The approximate eutectoid temperature of this alloy that has 6.0 wt% Mn is 650°C or 1330°F.

From the information given, the approximate eutectoid temperature of this alloy that has 6.0 wt% Mn is 650°C. This can be converted to Fahrenheit as:

= (650 × 2) + 30

= 1300 + 30

= 1330F

The proeutectoid phase when this alloy is cooled to a temperature just below the eutectoid will be ferrite. It's a ceramic like material with magnetic properties.

The relative amounts of the proeutectoid phase will be:

= (0.62 - 0.20)/062

= 0.68

Similarly, the relative amount of the pearlite will be:

= 0.20/0.62

= 0.32

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Answer:

1.30

Explanation:

The neutralization reaction involved in the titration is:

HClO₄(aq) + KOH(aq) → KClO₄(aq) + H₂O(l)

According to the chemical equation,

1 mol of HClO₄ reacts with 1 mol of KOH (1 equivalent of acid with 1 equivalent of base). The moles are calculated from the product of the molar concentration (M) and the volume in liters.

We have the following moles of acid (HClO₄):

40.0 mL x 1 L/1000 mL = 0.04 L 0.200 mol/L x 0.04 L = 8 x 10⁻³ moles HClO₄

Since HClO₄ is a strong acid (completely dissociated into H⁺ and ClO₄⁻ ions), the moles of HClO₄ are equal to the moles of H⁺.

Then, we can calculate the initial pH:[H⁺] = 0.200 M → pH = -log [H⁺] = -log (0.200) = 0.70

Now, we calculate the pH after the addition of KOH. Since KOH is a strong base, the concentration of KOH is equal to the concentration of OH⁻ ions.

a) 0.0 mLNo KOH is added, so the pH is the initial pH:

0.70

b) 80.0 mL KOH80.0 mL x 1 L/1000 mL = 0.08 L0.100 mol/L x 0.08 L = 8 x 10⁻³ moles KOH = 8 x 10⁻³ moles OH⁻

After neutralization we have: 8 x 10⁻³ moles H⁺ - 8 x 10⁻³ moles OH⁻ = 0The neutralization reaction is complete and there is no remaining H⁺ from the acid.

The concentration of H⁺ is equal to the concentration of H⁺ of water:

[H⁺] = 1 x 10⁻⁷ M → pH = -log [H⁺] = -log (1 x 10⁻⁷) = 7.0

c) 10.0 mL KOH10.0 mL x 1 L/1000 mL = 0.01 L0.100 mol/L x 0.01 L = 1 x 10⁻³ moles KOH = 1 x 10⁻³ moles OH⁻

After neutralization we have: 8 x 10⁻³ moles H⁺ - 1 x 10⁻³ moles OH⁻ = 7 x 10⁻³ moles H⁺

The total volume is:

V = 40.0 mL + 10.0 mL = 50 mL = 0.05 L[H⁺] = 7 x 10⁻³ moles/0.05 L = 0.14  → pH = -log [H⁺] = -log (0.14) = 0.85

d) 100.0 mL KOH100.0 mL x 1 L/1000 mL = 0.1 L0.100 mol/L x 0.1 L = 0.01 moles KOH = 1 x 10⁻² moles OH⁻

After neutralization we have:

1 x 10⁻² moles OH⁻ - 8 x 10⁻³ moles H⁺ = 2 x 10⁻³ moles OH⁻

The total volume is:

V = 40.0 mL + 100.0 mL = 140 mL = 0.14 L[OH⁻] = 2 x 10⁻³ moles/0.14 L = 0.014  → pOH = -log [OH⁻] = -log (0.014) = 1.84pH + pOH = 14 → pH = 14 - pOH = 14 - 1.84 = 12.15

e) 40.0 mL KOH40.0 mL x 1 L/1000 mL = 0.04 L0.100 mol/L x 0.04 L = 4 x 10⁻³ moles KOH = 4 x 10⁻³ moles OH⁻

After neutralization we have: 8 x 10⁻³ moles H⁺ - 4 x 10⁻³ moles OH⁻ = 4 x 10⁻³ moles H⁺

The total volume is:

V = 40.0 mL + 40.0 mL = 80.0 mL = 0.08 L[OH⁻] = 4 x 10⁻³ moles/0.08 L = 0.05 M  → pH = -log [H⁺] = -log (0.05)

= 1.30

Answer: 30.0 L S02

Explanation: It was right on mine

Answer:

humans are omnivores they eat plants and animals exept for that vegan teacher

Explanation:

The number of moles of K+ that are on 750 mL of the patient's blood is = 3.375moles.

Since mmol is one-thousandth of a mole also a mEq is one-thousandth of an equivalent. Therefore both can be used interchangeably.

That is 4.5mEq/L of potassium =  4.5mmol/L

If 4.5 moles = 1000ml ( 1 liter =1000ml)

x mole = 750 ml

Make x the subject of formula,

x mole = 750 × 4.5 / 1000

            = 3,375/1000

            = 3.375moles

Therefore, the number of moles of  K+ that are on 750 mL of the patient's blood is = 3.375moles.

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Answer:

a fast moving heat island

Explanation:

cause there is a high amount of heating molecule produced.

Answer:

The correct answer is C. a canopy heat island