Why water is able to stick to the side of a glass

The true statements are;

The reaction is endothermic

Heat is a reactant

ΔHrxn is 89 kJ/mol

Enthalpy is a thermodynamic property that represents the total energy of a system, including both its internal energy (the energy of its constituent particles) and the energy it has due to its temperature and pressure. It is commonly used in energy analysis and heat transfer calculations and is expressed in units of joules (J) or calories (cal).

We know that the enthalpy of the reaction can obtained from;

Enthalpy of the products - Enthalpy of the reactants

ΔH reaction = 2(-391.4) - 2(-435.9)

(-782.8) - (-871.8)

= 89 kJ/mol

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Explanation:

if it was meant for [Ar]4s²3d¹ :

1s²2s²2p⁶3s²3p⁶4s²3d¹

number of e‐ : 21

atomic number is 21.. element is scandium

ion: Sc³+

Answer:

will be 9.7 Liters

Explanation:

Answer:

they're

Explanation:

solid, liquid and gas

Answer:

FeCl₂

Explanation:

Empirical formula is the simplest formula of a compound.

Mass percentage of Chlorine  = 56%

Mass percentage Iron  = 100  - 56  = 44%

                                                              Elements  

                                                 Fe                                 Cl

Percentage mass                    44                                  56

moles                                      44/55.85                   56/35.5

                                                  0.79                         1.56

Divide by the smallest

number                                    0.79/0.79                 1.56/0.79

                                                        1                                 2

The empirical formula of the compound is FeCl₂

\(1.5\)  moles of potassium chromate must be dissolved in \(125 g\) of water in order to produce a  \(12.0 m\) solution.

To determine the number of moles of potassium chromate that must be dissolved in   \(125 g\) of water in order to produce a \(12.0 m\) (molar) solution, we can use the formula:

Molarity (M) = moles of solute / liters of solution

First, we need to convert the mass of water from grams to liters. The density of water is approximately \(1 g/mL\), or  \(1 g/cm^3\). Therefore, the volume of water is:

Volume of water = mass of water / density of water \(= 125 g / 1 g/cm^3 = 125 cm^3 = 0.125 L\)

Now, we can use the given molarity and volume of solution to calculate the moles of potassium chromate:

Molarity (M)  \(= 12.0 mol/L\) (given)

Volume of solution  \((L) = 0.125 L\) (calculated)

moles of solute = Molarity (M) x Volume of solution (L)

moles of solute \(= 12.0 mol/L \times 0.125 L\)

moles of solute \(= 1.5 mol\)

Therefore, \(1.5\)  moles of potassium chromate must be dissolved in \(125 g\) of water in order to produce a  \(12.0 m\) solution.

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Menthol is a substance commonly used in cough drops. It has a molar mass of 156.3 g/mol and is comprised of 77.4% carbon and 12.9% hydrogen and 10.2% oxygen. The molecular formula is C\(_{10}\)H\(_{20}\)O.

The precise quantity and kind of atoms that make up a single chemical molecule are specified in its molecular formula. A compound's constituent elements are denoted by their chemical symbols, which are followed by numerical subscripts that indicate how many atoms of each constituent are contained in the molecule.

A molecular formula does not have a chemical name and is wordless. A molecular formula may suggest particular simple chemical structures, but it is not the same as a formula for the entire chemical structure. Compared to structural formulas, they are more restrictive.

moles of carbon =0.122/12=0.010

Moles of Hydrogen =0.0204/1=0.0204

moles of oxygen = 0.0171/16 =0.0017

Dividing by simple whole number ratio

The ratio of C : H : O = 10 : 20 : 1. The molecular formula is C\(_{10}\)H\(_{20}\)O.

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When the temperature rises, atoms and molecules move faster and collide, creating thermal energy (also known as heat energy).

Thermal energy is the energy that results from the heated substance's temperature. Thermal energy is produced by materials whose molecules and atoms vibrate more quickly as a result of a rise in temperature.

The atoms and molecules that make up matter are always in motion. The increase in temperature caused by heating a substance causes these particles to accelerate and collide.

The energy that arises from a heated substance is referred to as thermal energy. The more the substance's thermal energy and the more its particles travel at higher temperatures.

Therefore, When the temperature rises, atoms and molecules move faster and collide, creating thermal energy (also known as heat energy).

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Answer:

Option B. Heptane

Explanation:

To obtain the parent name of the above compound, all we need to do is to locate the longest continuous carbon chain.

The longest continuous carbon chain of the above compound is 7.

Next, we shall also consider the chain if there is any double or triple bond.

From the diagram given above, no double or triple bond is present.

Finally, the parent name of the compound is heptane since the longest continuous carbon chain is 7 and no double or triple bond is present in the compound.

Objects would no longer be drawn toward each other, because there would be no sloping surface for them to fall down. Instead, they would fly off in whatever direction gravity was keeping them from going.

Answer:

All items in the universe, humans, objects, and the planets, would be floating around. Everything would become weightless.

The pH of the buffer solution would be 7.11.

Phosphoric acid, H3PO4, can donate three protons (H+) in a stepwise manner to form dihydrogen phosphate (H2PO4-) and mono hydrogen phosphate (HPO4^2-) ions. The chemical equation for the reaction is as follows:

H3PO4 + H2O ⇌ H2PO4^- + H3O^+

H2PO4^- + H2O ⇌ HPO4^2- + H3O^+

HPO4^2- + H2O ⇌ PO4^3- + H3O^+

The pKa values for these reactions are 2.15, 7.20, and 12.35, respectively.

To prepare a buffer solution, we need to mix a weak acid and its conjugate base or a weak base and its conjugate acid. In this case, we have a mixture of H3PO4 and KH2PO4, which is a weak acid and its conjugate base, respectively.

The Henderson-Hasselbalch equation for a buffer solution is:

pH = pKa + log([base]/[acid])

where [base] and [acid] are the molar concentrations of the conjugate base and weak acid, respectively.

Using the given values:

[acid] = 0.155 mol / 0.500 L = 0.310 M (molarity of H3PO4)

[base] = 0.250 mol / 0.500 L = 0.500 M (molarity of KH2PO4)

We can calculate the pKa value for the first dissociation of H3PO4 using the given Ka value:

Ka = 10^(-pKa) = 7.52 x 10^(-3)

pKa = -log(Ka) = 2.12

Now, substitute the values into the Henderson-Hasselbalch equation:

pH = 2.12 + log(0.500/0.310)

pH = 7.11

Therefore, the pH of the buffer solution is approximately 7.11.

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According to the given statement, A flow rate of 3.15 x 10^-5 kL.hr⁻¹ is equivalent to 8.75 µL.s⁻¹. To convert kL.hr⁻¹ to µL.s⁻¹, we can use the steps: (Given below)

liquids flow is the amount of liquids that moves in a given amount of time. When measuring the flow of water supplies, different units are frequently used, including cubic feet per second (cfs), cubic meters per second (cms), gallons per minute (gpm), and others.

⇒ Convert kiloliters (kL) to liters (L) by multiplying by 1000.

⇒ Convert hours (hr) to seconds (s) by multiplying by 3600.

⇒ Convert liters per hour (L.hr⁻¹) to microliters per second (µL.s⁻¹) by dividing by 3.6.

Using these steps, we get:

3.15 x 10^-5 kL.hr⁻¹ = 3.15 x 10^-5 x 1000 L.hr⁻¹ = 0.0315 L.hr⁻¹

0.0315 L.hr⁻¹ = 0.0315 / 3600 L.s⁻¹ = 8.75 x 10^-6 L.s⁻¹

8.75 x 10^-6 L.s⁻¹ = 8.75 x 10^-6 x 10^6 µL.s⁻¹ = 8.75 µL.s⁻¹

Therefore, a flow rate of 3.15 x 10^-5 kL.hr⁻¹ is equivalent to 8.75 µL.s⁻¹.

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Answer:

B.) Adhesion

Explanation:

A.) is incorrect. Viscosity is a measure of internal friction that affects the fluidity of a liquid.

B.) is correct. Adhesion is the ability of water to stick to other substances (which are not water).

C.) is incorrect. Surface tension is the tension created by the bonds of the surface particles.

D.) is incorrect. Density is a ratio that compares mass to volume.

Answer:

d.Na

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

Answer:

Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.

Explanation:

Answer:

If Jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy,work is being done. Work is said to be done when it transforms energy from one form to another or from one place to another.

Explanation:

Answer:

Explanation:

well it needs water like us to stay alive

The given question is incomplete. The complete question is:

Suppose a current of 0.920 A is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for 47.0 seconds. Calculate the mass of pure silver deposited on a metal object made into the cathode of the cell.

Answer:   0.0484 g

Explanation:

\(Q=I\times t\)

where Q= quantity of electricity in coloumbs

I = current in amperes = 0.920 A

t= time in seconds = 47.0 sec

\(Q=0.920A\times 47.0s=43.24C\)

\(AgNO_3\rightarrow Ag^++NO_3^-\)

\(Ag^++e^-\rightarrow Ag\)

96500 Coloumb of electricity electrolyzes 1 mole of Ag

43.24 C of electricity deposits =\(\frac{1}{96500}\times 43.24=0.00045moles\) of Ag

\(\text{ mass of Ag}={\text{no of moles}\times {\text{Molar mass}}=0.00045mol\times 108g=0.0484g\)

Thus the mass of pure silver deposited on a metal object made into the cathode of the cell is 0.0484 g

The amount, in mL, of the suspension that should be given to an infant weighing 17 lb will be 1.16 mL

0.8 mL of the liquid contains 80.0 mg of the drug.

The recommended dose is 15 mg per kg of body weight

The infant to be given the drug weighs 17 lb.

First, let's convert the weight of the infant to kg.

1 lb = 453.59 g

17 lb =       453.59 x 17/1

                   = 7711.03 g

1000 g = 1 kg

7711.03 g = 7711.03 x 1/1000

               = 7.711 kg

So, the baby's weight is 7.711 kg.

The drug dose for the baby can thus be calculated as:

15 mg x 7.711 = 115.67 mg

But 0.8 mL of the drug contains only 80.0 mg. How many mL will contain 115.67 mg?

                   0.8 x 115.67/ 80.0 = 1.16 mL

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Answer:

The reaction will shift leftwards, towards the formation of more cyclohexane at 25 °C

Explanation:

Hello,

In this case, for the given chemical reaction, we can write the law of mass action (equilibrium expression) as shown below:

\(Kc=\frac{[CH_3C_5H_9]}{[C_6H_{12} ]}\)

Thus, since Kc < 1, we can conclude there are more moles of cyclohexane at equilibrium (denominator is greater than numerator), therefore, the reaction will shift leftwards, towards the formation of more cyclohexane at 25 °C.

Best regards.

We want to transform the measure: 0.680 L/min to microliters per hour.

We will find that the equivalent measure is 40,800,000 μL/h

To do it, we first need to remember that:

1 L = 1*10^6 μL

1 hour = 60 min

Then we can rewrite these as:

1 = (60min/1 h)

1 = ( 1*10^6 μL/ 1L)

Remember that if we multiply any quantity by one we do not change that quantity, then to change the units we just need to multiply our measure by the above fractions:

M = 0.680 L/min*( 1*10^6 μL/ 1L)*(60min/1 h) = 40,800,000 μL/h

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Ferrous sulfate (FeSO4) is obtained by the reaction of aqueous ferric sulfate with gaseous sulfur dioxide and water according to the equation below:

Aqueous ferric sulfate = \(Fe_2(SO_4)_3_{(aq)}\)

Gaseous sulfur dioxide = \(SO_2_{(g)}\)

Water = \(H_2O_{(l)}\)

Aqueous sulfuric acid =  \(H_2SO_4_{ (aq)}\)

Aqueous ferrous sulfate =  \(FeSO_4_{ (aq)}\)

Thus, the balance equation becomes:

\(Fe_2(SO_4)_3_{(aq)}\) +  \(SO_2_{(g)}\) + \(2H_2O_{(l)}\) \(--->\) \(2 H_2SO_4_{ (aq)} + 2 FeSO_4_{ (aq)}\)

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Type #1 Flame symbols are among the WHMIS emblems.

Type 2: Symbols with a flame above a circle.

Exploding bomb symbols are of type 3.

Compressed gas symbols are of type 4.

Corrosion symbols are type #5.

Skull and water the water symbols are type #6.

Exclamation mark symbols are type #7.

Health hazard symbols are type #8.

Because workplaces require a defined technique to detect hazardous items, WHMIS labels are crucial.

The national ’s hazard standard for Canada is the Health And Safety At work System (WHMIS). Hazard categorization, cautionary container labeling, the distribution of safety data sheets, and worker information and training programs are the system's main components.

The U.S. Ohs Hazard Identification Standard and WHMIS are quite similar.

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Answer:

D

Explanation:

2H202 = 2H2O + O2

Answer:

please rate my answer 5 Star

Explanation:

Using Boyle's Law,

The pressure exerted by a gas is inversely proportional to the volume the gas is occupying provided the temperature is constant

p*v = constant

100*1000*7.5 = p * 11

p = 750000/11

Answer:

5l NO

2

at STP

No. of molecules=

22.4

5

mol=

22.4

5

×N

A

molecules

A) 5ℊ of H

2

(g)

No. of moles=

2

5

mol=

2

5

×N

A

molecules

B) 5l of CH

4

(g)

No. of moles of CH

4

=

22.4

5

mol=

22.4

5

N

A

molecules

C) 5 mol of O

2

=5N

A

O

2

molecules

D) 5×10

23

molecules of CO

2

(g)

Molecules of 5l NO

2

(g) at STP=5l of CH

4

(g) molecules at STP

Therefore, option B is correct.

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Answer:

gelatin and cornstarch

Explanation:

when looking at the data show you can infer the correct answer. hope this helps!

Answer:

Corn Starch and Gelatin

Explanation:

They both give the same as unknown