Steam is collected and observed to condense into liquid water. Which of the following would you expect to observe if a thermometer recorded the temperature of the substance?

SELECT AN ANSWER

The temperature would decrease.


The temperature would remain the same.


It would depend on the amount of steam.


The temperature would increase.

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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Substituting the given values, we have (0.5 L) / (220 + 273.15 K) = V₂ / (313.15 K).Solving for V₂, we get V₂ = (0.5 L) * (313.15 K) / (220 + 273.15 K).

Calculating this expression, the volume of the balloon when fully cooled by your refrigerator would be approximately 0.38 liters when rounded to two decimal places.To convert Celsius to Kelvin, we need to add 273.15 to the Celsius temperature. Therefore, the temperature inside your refrigerator of 40 degrees Celsius is equivalent to 313.15 Kelvin.Now, let's consider the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.Since the number of moles and pressure remain constant, we can write  the equation as V₁/T₁ = V₂/T₂, where V₁ is the initial volume of the balloon, T₁ is the initial temperature, V₂ is the final volume, and T₂ is the final temperature.

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A leather jacket and printer paper are examples of items that can be made from renewable resources, while plastic forks, metal cans, and electronics are not considered renewable due to their reliance on non-renewable materials and processes. Option  C, E

The two correct answers that are made from renewable resources are:

C) Leather jacket: Leather is derived from animal hides, which are a byproduct of the meat industry. As long as there is a sustainable and responsible approach to animal farming, the production of leather can be considered renewable. The hides are obtained from animals that are raised for meat consumption, and their use in leather production helps reduce waste.

E) Printer paper: Printer paper can be made from various sources, including trees, bamboo, and recycled paper fibers. If the paper is sourced from sustainably managed forests or from fast-growing plants like bamboo, it can be considered renewable. Additionally, the use of recycled paper fibers reduces the demand for materials and promotes a more circular economy.

The other options, A) plastic fork, B) metal can, and D) electronics, are not made from renewable resources:

A) Plastic fork: Plastics are typically derived from fossil fuels, which are non-renewable resources. The production of plastic involves the extraction and processing of petroleum or natural gas, both of which are finite resources.

B) Metal can: Metal cans are predominantly made from aluminum or steel. While these metals can be recycled, their initial production requires the extraction of raw materials from the Earth, which is not a renewable process.

D) Electronics: Electronics are made from a wide range of materials, including metals, plastics, and various chemical compounds. The production of electronics involves the extraction of raw materials, many of which are non-renewable resources.

Option C and E.

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Answer:

I think

(d) All compounds contain the same elements in the same properties

We have a gas that we will assume behaves like an ideal gas. So we can apply the ideal gas law. The ideal gas law tells us:

Where,

P is the pressure of the gas

V is the volume of the gas

n is the moles of the gas

R is a constant

T is the temperature of the gas

We have two states of the gas. One initial and one final, for both states it is assumed that the moles remain constant. The conditions for each state are.

Initial state:

V1=2.3mL

P1=5.3atm

T1=45°C =318.15K

Final state:

V2=1.2L

P2=2.5atm

T2=?

For each state the ideal gas law will be:

Now, as the moles remain constant, the term nR will be constant and we can equate the two equations, we will then have that:

Now, we clear T2 and replace the known data:

The temperature of the gas will be 78.3K

Answer:

a is ok

Explanation:

if they had gold it would be better but no

Answer:

2Ca +O2 ----------> 2CaO ( Balanced Reaction)

The balanced chemical equation for the standard formation reaction of solid calcium oxide (CaO) is

Ca + O2 --> CaO2

A balanced chemical equation is an equation in which the the number of atoms of each elements on both the reactant and products sides are equal.

Calcium oxide is an alkaline which is solid at room temperature and is formed by the reaction of one atom of calcium and two atoms of oxygen.

Therefore, the balanced equation of formation reaction of solid calcium oxide (CaO) is Ca + O2 --> CaO2.

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Answer:

You could color it different. Explain in a picture the difference. There are so many different variety's.

Explanation:

This question is describing the following chemical reaction at equilibrium:

\(A\rightleftharpoons B\)

And provides the relative amounts of both A and B at 25 °C and 75 °C, this means the equilibrium expressions and equilibrium constants can be written as:

\(K_1=\frac{90\%}{10\%}=9\\\\K_2=\frac{20\%}{80\%} =0.25\)

Thus, by recalling the Van't Hoff's equation, we can write:

\(ln(K_2/K_1)=-\frac{\Delta H}{R}(\frac{1}{T_2} -\frac{1}{T_1} )\)

Hence, we solve for the enthalpy change as follows:

\(\Delta H=\frac{-R*ln(K_2/K_1)}{(\frac{1}{T_2} -\frac{1}{T_1} ) }\)

Finally, we plug in the numbers to obtain:

\(\Delta H=\frac{-8.314\frac{J}{mol*K} *ln(0.25/9)}{[\frac{1}{(75+273.15)K} -\frac{1}{(25+273.15)K} ] } \\\\\\\Delta H=4,785.1\frac{J}{mol}\)

Learn more:

Answer:

Ca3(PO4)2

Explanation:

Ca3(PO4)2 or calcium phosphate is insoluble in water.

Cu + O2 --->  CuO2 -The first reaction is a combustion reaction

2 HCl + Mg → H2 + MgCl2- The second reaction is a Single replacement reaction

A combustion reaction is a type of chemical reaction that occurs between a fuel and an oxidizer in the presence of heat or light, resulting in the release of energy in the form of heat and light.

In other words, it is a reaction in which a substance reacts with oxygen to produce heat and light.

Combustion reactions are important in many aspects of daily life, including the burning of fossil fuels for energy production, the combustion of wood or other materials for heating or cooking, and the combustion of fuels in internal combustion engines.

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The given unit conversions for the mass and length are as follows:

a. 0.765 g = 0.000765 kg

b. 1.34 g = 1340

c. 34.2 mg = 0.0342 g

d. 23 745 kg = 2.3745 * 10⁹ mg

2. a. 17.3 m = 17300 cm

b. 2.56 m = 0.00256 km

c. 567 dm = 56.7 m

d. 5.13 m = 5130 m

3. The shortest length is 0.0128 km and the longest length is 1583 cm

The mass of an object is the amount of matter present in the substance.

The mass of objects is measured using a chemical balance, the unit of measurement is kilograms.

The various units can be interconverted.

To convert each of the following masses to the units requested, the conversion factor is used;

a. 0.765 g to kilograms

0.765 g = 0.765/ 1000

0.765 g = 0.000765 kg

b. 1.34 g to milligrams

1.34 g = 1.34 * 1000

1.34 g = 1340

c. 34.2 mg to grams

34.2 mg = 34.2 / 1000

34.2 mg = 0.0342 g

d. 23 745 kg to milligrams

23 745 kg = 23 745 * 10⁶

23 745 kg = 2.3745 * 10⁹ mg

2. To convert each of the following lengths to the units requested, the steps are as follows:

a. 17.3 m to centimeters

17.3 * 100 cm

17.3 m = 17300 cm

b. 2.56 m to kilometers

2.56 m = 2.56/ 1000

2.56 m = 0.00256 km

c. 567 dm to meters

567 dm = 567 / 10

567 dm = 56.7 m

d. 5.13 m to millimeters

5.13 m = 5.13 * 1000

5.13 m = 5130 m

3. Converting the following lengths to meters:

1583 cm = 15.83 m

0.0128 km = 12.8 m

17 931 mm = 17.931 m

14 m

The shortest length is 0.0128 km and the longest length is 1583 cm

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Carbon atoms may thus form bonds to as many as four other atoms. For example, in methane (CH 4​start subscript, 4, end subscript), carbon forms covalent bonds with four hydrogen atoms

__________________________________________________________

The percent by mass of the fluorine in the compound is 46.472%.

We know that the percent by mass has to do with the ratio of the total mass of the atom that is part of the compound and the total molar mass of the compound multiplied by one hundred.

The question in this case has demanded that we ought to obtain the mass percent of fluorine from the compound that we can be able to identify from the formula of the compound that is shown here as xenon hexa fluoride.

Mass of the compound can be obtained from; 131 + 6(19)

= 245 g/mol

The total mass of the fluorine atom in the compound is 114 g

Thus we have the use of;  114 /245 * 100/1

= 46.472%

The percent  by mass is now gotten for the fluorine atom as 46.472%.

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The amount of sugar molecules present in 300mL of a 2.0M solution is 3.61 × 10²³ molecules of sugar.

The number of molecules of a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number (6.02 × 10²³).

According to this question, 300mL of a 2.0M solution is given. The molarity of the solution can be calculated as follows:

no of moles = 0.300 × 2.0 = 0.6moles

no of molecules = 0.6mol × 6.02 × 10²³

no of molecules = 3.61 × 10²³ molecules of sugar.

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i When sodium carbonate (Na2CO3) is mixed with an aqueous solution of copper(II) sulfate (CuSO4), the student can expect to see several evidence of a chemical reaction:

Formation of a solid precipitate: When these two solutions are mixed, a solid precipitate of copper(II) carbonate (CuCO3) will form. This is a sign that a chemical reaction has occurred.

Change in color: The reaction between sodium carbonate and copper(II) sulfate will also result in a change in color. The solution may turn a blue or green color, indicating the presence of copper(II) ions.

Release of gases: The reaction between sodium carbonate and copper(II) sulfate may also produce gases, such as carbon dioxide (CO2).

ii The balanced chemical equation for the reaction between sodium carbonate and copper(II) sulfate is:

2Na2CO3(aq) + CuSO4(aq) → 2Na2SO4(aq) + CuCO3(s)

iii This is a double displacement reaction, also known as a metathesis reaction. In this type of reaction, the cations (positively charged ions) and anions (negatively charged ions) of the reactant compounds exchange places to form the products. In this case, the sodium ions (Na+) and the copper ions (Cu2+) exchange places to form sodium sulfate (Na2SO4) and copper carbonate (CuCO3).

Answer: Clouds need two things to form: cool air and particles on which water vapor can condense. Clouds form as air cools. Cold air cannot hold as much water vapor, so the water vapor condenses. Water vapor condenses on small particles in the atmosphere, such as smoke, salt, and dust. As a result, clouds form.

Explanation: correct on edge

The molarity of the NiSO₄ solution made by dissolving 38.81 grams of nickel (ii) sulfate, NiSO₄, in enough water to make 0.467 liters of solution is 0.535 M

First, we shall obtain the mole of 38.81 grams of nickel (ii) sulfate, NiSO₄. Details below:

Mole of NiSO₄ = mass / molar mass

= 38.81 / 154.75

= 0.25 mole

Now, we shall determine the molarity of the solution. Details below:

Molarity of solution = mole / volume

= 0.25 / 0.467

= 0.535 M

Thus, the molarity of the solution is 0.535 M

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Answer:

It is A.

Explanation:

I took the test.

The Lewis structure shows the arrangement of valence electrons in H3PO4.

The Lewis structure gives us a picture of the number of valence electrons in a molecule. This is because, in a Lewis structure, the electrons in the molecule are shown as dots. A single line may be used to show shared electrons in a covalent bond.

The correct Lewis structure of H3PO4 is an upper P is single bonded above to an O, and to the left, right, and below to an O single bonded to an H. The O above the P has three pairs of dots to the left, above, and below; the O's to the sides have pairs of dots above and below, and the O below the P has pairs of dots right and left.

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Answer: Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

A physical change is are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.

Answer:

j

Explanation:

becaisdbyhe wrl is so not goood

Answer:

The pistil and the stamen.

Explanation:

Please Mark Me Branliest.

The pistil and the stamen are the specialized  structures increase the probability of successful plant reproduction

Reproduction in Flowering Plants occur both asexually and sexually, flowering plants or angiosperms, use the sexual mode of reproduction.

Reproduction in Flowering Plants occurs in the flower as  both male and the female gametes are present in it, various parts of flower involve in the process of reproduction.

There are four important steps in the reproduction of flowering plants. such as Pollination, Gametogenesis, Fertilization

The flower is a specialized structure where reproductive part of the plant, containing the male and female reproductive organs which facilitate fertilization.

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Answer:

Conc = 1.64 Mol / dm3

Explanation:

We have to first put down the equation of the neutralization reaction. This is given as;

2HCl + Ca(OH)2 --> CaCl2  + 2H2O

This means that 2 mol of HCl requires 1 mol of Ca(OH)2.

2 = 1

x = 0.042

x = 0.084 mol of HCl required.

Volume = 51.21 ml = 0.05121 dm3

Concentration = Mass / Volume

Conc = 0.084 / 0.05121

Conc = 1.64 Mol / dm3

Answer:

11

Explanation:

From the question given above, the following data were obtained:

Electronic configuration => 1s²2s²2p⁶3s¹

Number of electrons =?

We must understand that the electronic configuration of an element is written based the number of electrons present in the atom of the element.

To obtain the number of electrons in the atom given in the question above, we simply add up the electrons in each orbital. This can be obtained as follow:

Electronic configuration => 1s²2s²2p⁶3s¹

Number of electrons =?

Number of electrons = 2 + 2 + 6 + 1

Number of electrons = 11

Thus , the number of electrons in the atom is 11

Answer:

Explanation:

Answer:

1) Cathode rays are made up of negatively charged particles. 2)atoms contain negatively charged particles.3)Thomson's results led to the proposal of new atomic model the plum pudding model.

Explanation:

Answer:

B. Cathode rays are made up of negatively charged particles

C. Atoms contain negatively  charged particles

Explanation:

Edge 2021

Answer:

Endocrine glands release chemicals that are also known as hormones.

Explanation:

Hope this helped!!!

Answer:

D. Hormones

Explanation:

The Endocrine system deals with all things hormones such as growth development and anything else dealing with puberty

Answer:

The value of sec theta is

How to determine the value of sec theta

From the diagram, we start by calculating the length of the hypotenuse (h).

So, we have:

Evaluate

Simplify

The value of the secant in the second quadrant is calculated as:

So, we have:

Evaluate

Hence, the value of sec theta is

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THANKS

11

5.0

(6 votes)

Explanation:

hope it helps

Explanation: The concentration of a solution helps us to determine the collision speed between particles in a molecule or compound. Knowing the concentrations of components in solutions can help determine the health of the world.