someone please help me i wasn’t here in class when this was taught

Answer:

If a metal and metal solution react, the more reactive metal will displace the less reactive metal from solution. If the metal in solution you start with is formed from a more reactive metal than the metal to be added, no reaction will occur.

The molar concentration (molarity) of the HCI aq solution is 0.125 mol dm⁻³.

The balanced chemical equation for the reaction between hydrochloric acid and strontium hydroxide is:

2HCl(aq) + Sr(OH)2(aq) → SrCl2(aq) + 2H2O(l)

From the equation, we can see that 2 moles of hydrochloric acid react with 1 mole of strontium hydroxide.

Given that the volume of the hydrochloric acid solution is 20.00 cm³ and the concentration of the strontium hydroxide solution is 0.020 mol dm⁻³, we can calculate the amount of strontium hydroxide present:

Amount of Sr(OH)2 = concentration × volume

⇒                             = 0.020 mol dm⁻³ × 0.2500 dm³

⇒                              = 0.00500 moles

Since 2 moles of hydrochloric acid react with 1 mole of strontium hydroxide, the amount of hydrochloric acid used in the reaction is:

Amount of HCl = 0.5 × Amount of Sr(OH)2

⇒                       = 0.5 × 0.00500 moles

⇒                      = 0.00250 moles

The molar concentration of the hydrochloric acid solution can now be calculated:

Molar concentration = Amount of HCl / Volume of HCl solution

⇒                               = 0.00250 moles / 0.02000 dm³

⇒                               = 0.125 mol dm⁻³ or 0.125 M

Therefore, the molar concentration of the hydrochloric acid solution is 0.125 mol dm⁻³.

In a titration, the amount of one reactant (in this case, the hydrochloric acid) is determined by reacting it with a known amount of the other reactant (the strontium hydroxide). The reaction is allowed to go to completion, which means that all of the hydrochloric acid has reacted with the strontium hydroxide.

From the balanced chemical equation, we can see that 2 moles of hydrochloric acid react with 1 mole of strontium hydroxide. Therefore, we can use the amount of strontium hydroxide that was present in the sample to calculate the amount of hydrochloric acid that was used in the reaction.

Once we know the amount of hydrochloric acid used in the reaction, we can use the volume of the hydrochloric acid solution to calculate its concentration (molarity) using the formula:

Molar concentration = Amount of substance / Volume of solution

Substituting the values that we have calculated gives us the molar concentration of the hydrochloric acid solution.

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The given substance is a white solid that melts at 100°C, is soluble in water, and does not conduct electricity in either solid or dissolved forms. Based on these properties, it is most likely a molecular solid.

Molecular solids consist of individual molecules held together by intermolecular forces, such as van der Waals forces, dipole-dipole interactions, or hydrogen bonding. These forces are generally weaker than the bonds in metallic, covalent-network, or ionic solids, which often results in relatively low melting points. The 100°C melting point of the given substance suggests that it might be a molecular solid.
Additionally, molecular solids tend to be soluble in water, especially if they have polar molecules or can form hydrogen bonds with water. The solubility of the substance in question further supports the classification as a molecular solid.
Finally, molecular solids typically do not conduct electricity in either solid or dissolved forms. This is because they do not contain mobile electrons or ions that can move and carry an electric charge. Since the given substance does not conduct electricity, this characteristic also points to it being a molecular solid.
In summary, based on its melting point, solubility in water, and lack of electrical conductivity, the white substance is most likely a molecular solid.

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Answer:

22.4/3.8=5.89

Explanation:

The equilibrium vapor pressure with respect to water (eow) is 259.9 Pa. assume that saturation vapor pressure is same as equilibrium vapor pressure.

Therefore, the RH at the frost point is  

RH = (eow / saturation vapor pressure) × 100

= (259.9 Pa / 259.9 Pa) × 100

= 100%

b) At T = -11 °C, we need to compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi) to determine if ice particles will form. From the given table, at T = -11 °C, the equilibrium vapor pressure with respect to water (eow) is 237.7 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 165.3 Pa.

The air is supersaturated with respect to ice, and the presence of Kaolinite particles can provide surfaces for water droplets to condense onto, leading to the formation of ice particles.

c) At T = -12 °C, we compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi). From the given table, at T = -12 °C, the equilibrium vapor pressure with respect to water (eow) is 217.3 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 181.2 Pa.

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Answer:

Milk

Explanation:

We aren't given the temperature and pressure conditions, so we must assume standard conditions of room temperature and 1 atmoshere pressure.

ice cubes   NO.  By definition, they are solid water.

milk            YES, it is an emulsion, but still a liquid (not a solution)

rock           NO, unless it is coming from a volcano

fog             No, fog is small condensed water vapor droplets.

rain            No, liquid

oxygen     No, gas

Answer:

The type of reaction that occurs without being started by some outside force is a spontaneous reaction. Spontaneous reactions are chemical or biological events that occur without the intervention of external factors. Non-spontaneous reactions are chemical reactions that need an energy input or cannot occur without the influence of external variables.

We can use the formula for heat released:

Q = mcΔT

where Q is the heat released, m is the mass of the sample, c is the specific heat of the material, and ΔT is the change in temperature.

Plugging in the given values, we have:

113.8 J = m(0.240 J/g°C)(-45.0°C)

Simplifying:

m = 113.8 J / (0.240 J/g°C * -45.0°C)

m = 106.5 g

Therefore, the mass of the silver sample is 106.5 g.

Answer:

Tác giả văn bản ' Mẹ tôi ' : Edmondo De Amicis ( 1846-1908 ) là nhà văn người Ý ( I-ta-li-a )

The compounds ranked by their expected lattice energy from greatest to least are: MgF_2, MgCl_2, MgBr_2, MgI_2.

Lattice energy is a measure of the energy released when gaseous ions come together to form an ionic solid. It is influenced by factors such as ion charge and ion size. In general, as the charges of the ions increase, the lattice energy also increases. However, when comparing ions with the same charge, the size of the ions becomes the determining factor.

In the given compounds, the common ion is Mg_2+ (with a +2 charge), while the anions are F-, Cl-, Br-, and I-. Among these anions, fluoride (F-) has the smallest ionic radius, followed by chloride (Cl-), bromide (Br-), and iodide (I-). Smaller ions have a higher charge density, meaning the positive charge is concentrated in a smaller space, leading to stronger attractive forces between the ions.

Therefore, based on ion size, the compound with the greatest expected lattice energy is MgF_2, followed by MgCl_2, MgBr_2, and MgI_2, with MgF_2 having the strongest bond and MgI_2 having the weakest bond.

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Answer:

It stays the same

Explanation:

From the gas law:

P1V1/T1 = P2V2/T2

P1 = P, V1 = V, T1 = T and P2 = 15.5P, V2 = ? , T2 = 15.5T

Substituting the various variables into the gas law equation:

PV/T = 15.5PV2/15.5T

Make V2 the subject of the formula:

V2 = 15.5TPV/15.5PT

V2 = V.

V1 = V and V2 = V, hence, the volume of the balloon stays the same.

Answer:

It stays the same

Explanation:

Edge 2020

The molar concentration of acid in the aliquot before putting it in acetone is

Titration is defined as 'the process of determining the quantity of a substance A by adding measured increments of substance B, the titrant, with which it reacts until exact chemical equivalence is achieved (the equivalence point)'.

Dilution equation is given as:

\(M_1\)\(V_1\) = \(M_2\)\(V_2\) , where M = Molarity and V = Volume. Applying the formula we get: 0.04M × 1ml = \(M_2\) × 1Oml

⇒ \(M_2\) = 0.04M × 1ml

                  10ml

⇒ \(M_2\) = 0.004M

Therefore 0.004M will be the molar concentration of acid in the aliquot before putting it in acetone.

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The given statement "Heat is not a measure of the ability of a substance to take in or give up heat" is false. . Heat is actually the energy transferred from one body or system to another due to a difference in temperature.

Heat can be thought of as a flow of energy from hotter to cooler objects, and it is measured in joules (J) or calories (cal). The ability of a substance to take in or give up heat is actually described by its specific heat capacity.

Specific heat is defined as the amount of heat energy required to raise the temperature of one unit of mass of a substance by one degree Celsius. Therefore, a substance with a high specific heat can take in or give up more heat energy than a substance with a low specific heat for the same change in temperature.

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The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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The pH of the equivalence point in a 0.50 L solution of 0.10 M HF titrated to the equivalence point with a 0.10 M solution of NaOH is 8.28.

When HF is titrated with NaOH, the reaction is as follows: HF + NaOH → Naf + H2OAt the equivalence point, the moles of NaOH added is equal to the moles of HF initially present. Since the initial concentration of HF is 0.10 M and the volume of the solution is 0.50 L, the initial moles of HF are 0.10 M x 0.50 L = 0.050 moles. Therefore, 0.050 moles of NaOH are added to the solution.At the equivalence point, all of the HF has been converted to NaF, which is the conjugate base of HF. NaF is a basic salt that hydrolyzes in water, resulting in the formation of OH- ions.

This means that the solution will be basic at the equivalence point. To determine the pH of the equivalence point, we need to find the pOH first. Since the concentration of NaF is 0.10 M and the volume of the solution is 1.0 L (since the final volume is 1.0 L), the moles of NaF are 0.10 M x 1.0 L = 0.10 moles. Since NaF completely dissociates in water, it will produce 0.10 moles of OH- ions. Therefore, [OH-] = 0.10 moles / 1.0 L = 0.10 Musing the equation pOH = -log[OH-], we get: Poh = -log(0.10) = 1.00Therefore, pH = 14.00 - pOH = 14.00 - 1.00 = 13.00. Since we need to use two significant figures, the pH is 13.

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Answer:

C. Earthquake

Explanation:

Earthquake is a likely result of the slippage along this fault boundary.

At a transform margin, rocks are moving parallel to one another. This often causes a slippage that leads to the generation of earthquakes.

Answer:

C

Explanation:

Answer:

option c. i took the quiz

Explanation:

Answer:

0.497 moles/L

Explanation:

The reaction that takes place is:

First we calculate the moles of lactic acid in 0,821 g, using its molar mass:

One mole of lactic acid reacts with one mole of sodium hydroxide (it is a monoprotic acid), so in 18,34 mL of NaOH solution there are  9,122x10⁻³moles of NaOH:

Answer:

These are largely the result of human reliance on fossil fuels and heavy industry, but can also be due to the accumulation of waste, modern agriculture, and other man-made processes. The combustion of fossil fuels like coal, petroleum and other factory combustibles is a major cause of air pollution

Answer:

7NH

Explanation:

Answer:

The separation of sodium and chlorine from sodium chloride

Explanation:

When sodium chloride reacts with water to form the aquated sodium and chloride ions, the entropy increases and thus the reaction is spontaneous

The total number of protons are 6 and the total number of neutrons are 7 in an atom of the naturally occurring carbon isotope with the largest mass number.

Isotopes of almost all elements save hydrogen get their names from the mass number of their nuclei. Carbon atoms, for instance, have a mass number of 12 since the sum of their six protons and six neutrons equal 12. As a result, these atoms are referred to as carbon-12. The atomic mass of carbon atoms with seven neutrons is 13, which is equal to six protons plus seven neutrons. The isotope known as carbon-13 can be found in these atoms.

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A gas mixture with a total pressure of 745 torr contains each of these gases at the indicated partial pressures: CO₂ at 125 torr Ar at 214 torr O₂ at 187 torr. the mixture also contains helium gas. the partial pressure in torr of the helium gas is 219 torr.

Given that :

partial pressure of CO₂ = 125 torr

partial pressure of O₂  = 187 torr

partial pressure of Ar = 214 torr

total pressure = 745 torr

partial pressure of Helium = ?

according to the Dalton's law of partial pressure :

Total pressure = sum of the partial pressure of all the gases in the mixture

745 = 125 + 187 + 214 + partial pressure of He

partial pressure of He = 219 torr

Thus, A gas mixture with a total pressure of 745 torr contains each of these gases at the indicated partial pressures: CO₂ at 125 torr Ar at 214 torr O₂ at 187 torr. the mixture also contains helium gas. the partial pressure in torr of the helium gas is 219 torr.

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This problem is providing us with the initial temperature of 40 g of ice as -15 °C, so the heat involved in the process to heat it up to 16.5 °C is required as well as the type of process, endothermic or exothermic. At the end, we obtain 17.4 kJ as the total heat and the process to be endothermic.

In chemistry, we can quantify the energy that is involved in a phase change by considering every sub-process that takes place from the initial temperature to the final one. In such a way, since this block of ice must first heat to 0 °C, then melt and finally heat to 16.5 °C, one infers three heat terms are needed; two sensible-based and one latent-based:

\(Q_T=Q_1+Q_2+Q_3\)

Hence, we define and calculate each term as follows:

\(Q_1=m*C_{ice}*(0\°C-(-15\°C))=40g*2.093\frac{J}{g*\°C}(15\°C)=1255.8J\\ \\Q_2=m*\Delta _mH=40g*333.55\frac{J}{g} =13342J\\\\Q_3=mC_{water}(16.5\°C-0\°C)=40g*4.184\frac{J}{g*\°C}(16.5\°C)=2761.4J\)

Finally, we add them together to obtain:

\(Q_T=17359.2J*\frac{1kJ}{1000J}\\ \\Q_T=17.4kJ\)

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Answer: Well, a mole is really the same thing. For a chemist, a mole conjures up the number 6.02 times 10 to the 23rd, not a fuzzy little animal. The only difference is that the other quantities are more familiar to us. Lol

Explanation:

Answer:

basically is a unit measurement for the amount of substance in the unit syystem, some examples are ions, atoms molecules, or electrons.

Explanation:

Answer:

Alpha decay

Explanation:

That's the definition of alpha decay

Alpha decay would be an alpha product when released from an isotope. A further explanation is below.

Thus the above alternative is right.

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At the summit of Mount Everest, the boiling temperature of water C. would decrease (<100 ∘C).

The lower atmospheric pressure means that the pressure on the surface of the water is reduced, requiring less energy for the water molecules to escape as vapor. Consequently, the boiling point of water decreases to a temperature below 100 °C (212 °F).

At the summit of Mount Everest, the boiling point of water is approximately 68 °C (154 °F).

Therefore, if you were to bring water to a boil on the summit of Mount Everest, it would start to boil at a lower temperature compared to sea level due to the reduced atmospheric pressure.

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Answer:

NON METAL

Explanation:

come on really

Explanation:

The chocolate or wax in the activity can be compared to the tectonic plates on the surface of the Earth. Just like the tectonic plates, the chocolate or wax is made up of different layers that move and interact with each other. The movement of the tectonic plates is driven by convection currents in the mantle, which is the layer of the Earth beneath the crust. These convection currents are caused by differences in density between the hot, less dense material near the core of the Earth and the cooler, more dense material near the surface. Similarly, the movement of the chocolate or wax is driven by the heat from the flame, which causes the less dense, melted chocolate or wax to rise and the more dense, solid chocolate or wax to sink.

False. The equation AlCl4- + 2H+ = AlCl3 + H2O + HCl is balanced. This is due to the fact that two H+ ions are required to balance the -1 charge of AlCl4- and the charges on either side of the equation.

Due to differences in the amount of atoms of each element on the two sides, the above equation is not balanced. We must add coefficients to the reactants and products in order to balance it. We discover that two H+ ions are required to balance the charge on the AlCl4- ion after doing this. In addition, water (H2O) and HCl are also produced together with AlCl3. AlCl4-+2H+=AlCl3+H2O+HCl is the reaction's balanced equation. False. Because there are not an equal amount of atoms on both sides, the above equation is unbalanced. AlCl4- + 2H+ = AlCl3 + H2O + HCl is the balanced equation because two H+ ions are required to balance the charge on the AlCl4- ion and because the reaction also yields water and HCl.

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