Use the specific heat of water to determine how much heat is required to raise the temperature of 50.0g of water from 35oc to 55oc.

Answer;

Ba²⁺(aq) + CO₃²⁻(aq) → BaCO₃(s)

Explanation;

Ionic equation is a chemical equation that is written only showing the ions that have changed state in the course of a reaction. The rest ions called spectator ions are not involved in the reaction and do not change state thus they are not included when writing ionic equations.

-Aqueous compounds ionize in water to form corresponding ions, while precipitates, gases and pure liquids do not.

In our case; The only ions involved are Ba²⁺ and Co3²⁻, the rest are spectator ions, that is, NO3⁻ and Na⁺.

Thus the ionic equation will be;

Ba²⁺(aq) + CO₃²⁻(aq) → BaCO₃(s)

To calculate the number of molecules in a 1.27kg sample of lithium carbonate, convert the mass to grams, calculate the molar mass, convert the mass to moles, and then multiply by Avogadro's number to find the number of molecules. The calculation results in approximately 1.035 x 10²⁵ molecules. We use three significant figures for the final answer.

The question asks how many molecules are there in a 1.27kg sample of lithium carbonate. To find the number of molecules, we first need to calculate the number of moles in 1.27 kg of lithium carbonate and then use Avogadro's number to find the number of molecules.

Convert the mass of the sample from kilograms to grams.

Calculate the molar mass of lithium carbonate (Li₂CO₃).

Use the molar mass to convert the mass of lithium carbonate to moles.

Multiply the number of moles by Avogadro's number (6.02 x 1023 molecules/mol) to find the number of molecules.

Let's perform the calculations:

1.27 kg = 1270 g.

The molar mass of Li₂CO₃ is approximately 73.89 g/mol (Li: ~6.94 g/mol, C: ~12.01 g/mol, O: ~16.00 g/mol x 3).

The number of moles of Li2CO3 in 1270 g is 1270 g
divided by 73.89 g/mol = approximately 17.19 mol.

The number of molecules in 17.19 mol is 17.19 mol x 6.02 x 10²³ = 1.035 x 10²⁵ molecules.

Note that we have limited our final answer to three significant figures based on the precision of the given mass.

The correct answer is:

exothermic

Endothermic means it cools down or absorbs heat. Exothermic means it heats up or releases heat. Bond energies determine if a reaction is endothermic or exothermic.

Explanation:

Many chemical reactions consume or release heat and energy as part of the process. An exothermic reaction is any response that releases or gives off energy through the reaction. You can learn this by arranging together 'exo-' which means to exit, with 'therm' which refers to heat. Displayed in a chemical equation: reactants → products + energy.

Answer: [tex]Na[/tex]

Explanation:

Oxidation reaction : When there is a loss of electrons and thus an increase in oxidation number.

[tex]M\rightarrow M^{n+}+ne^-[/tex]

Reduction reaction : when there is a gain of electrons and thus a decrease in oxidation number.

[tex]M^{n+}+ne^-\rightarrow M[/tex]

Sodium metal has gone under oxidation, as its oxidation state is changing from 0 in [tex]Na[/tex] to +1 in [tex]NaOH[/tex]

[tex]H^+[/tex] ion has gone under reduction, as its oxidation state is changing from +1 in [tex]H^+[/tex] to 0 in [tex]H_2[/tex]

Those chemical agents which get oxidized itself and reduce others is called reducing agents. Thus [tex]Na[/tex] is a reducing agent here.

The neutralization equations in the stomach involving common antacids like calcium carbonate and magnesium hydroxide are CaCO3(s) + 2HCl(aq) = CaCl₂ (aq) + H₂O(l) + CO₂(g) and 2HCl(aq) + Mg(OH)₂(s) = MgCl₂(aq) + 2H₂O(l) respectively.

The neutralization equation that takes place in the stomach with two different bases used in antacid products can be represented by the reactions of calcium carbonate (a common ingredient of antacids) and magnesium hydroxide (found in products like Milk of Magnesia) with hydrochloric acid (stomach acid).

The neutralization reaction of calcium carbonate with hydrochloric acid would be CaCO3(s) + 2HCl(aq) = CaCl₂ (aq) + H₂O(l) + CO₂(g). In this reaction, the antacid neutralizes the excess stomach acid, converting it to water, a salt (calcium chloride) and carbon dioxide gas.

In case of magnesium hydroxide, the reaction with hydrochloric acid would be something like 2HCl(aq) + Mg(OH)₂(s) = MgCl₂(aq) + 2H₂O(l). Here, the magnesium hydroxide neutralizes stomach acid forming water and magnesium chloride.

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Answer:

C.) 243 grams

Explanation:

I got it right on founders edtell

The sugar substitute aspartame is composed of two amino acids.

Aspartame is made from the amino acids aspartic acid and phenylalanine. It is a methyl ester of a dipeptide. Aspartame is 180 times sweeter than sugar and is used as a sugar substitute.

Specifically, aspartame is a methyl ester of a dipeptide made from the amino acids aspartic acid and phenylalanine. These amino acids naturally occur in proteins and contribute to the sweetening properties of aspartame, which is approximately 180 times sweeter than table sugar. Aspartame is widely used in foods and beverages as a non-toxic sugar substitute.

Assuming that the O2 gas acts like an ideal gas, we find the following expression to be approximates of the behaviour of this gas:

P V = n R T                   ---> 1

where,

P = pressure exerted by the gas

V = volume occupied

n = number of moles

R = universal gas constant

T = absolute temperature

Further, we assume that the number of moles and the temperature are constant, hence reducing equation 1 into the form:

P V = k                         ---> 2

where k is a constant. Therefore we can equate two states:

P1 V1 = P2 V2

Since P1, V1 and V2 are given and we are to look for P2:

25 mL * 2 atm = 100 mL * P2

P2 = 0.5 atm

The sample of [tex]{{\text{O}}_2}[/tex] gas at volume 100 mL will occupy a pressure of  

[tex]\boxed{{\text{0}}{\text{.5 atm}}}[/tex]

Further explanation:

Ideal gas:

An ideal gas contains a large number of randomly moving particles that are supposed to have perfectly elastic collisions among themselves. It is just a theoretical concept, and practically no such gas exists. But gases tend to behave almost ideally at a higher temperature and lower pressure.

Ideal gas law is considered as the equation of state for any hypothetical gas. The expression for the ideal gas equation of gas is as follows:

[tex]{\text{PV}}={\text{nRT}}[/tex]                …… (1)                                                                         

Here,

P is the pressure of the gas.

V is the volume of gas.

n denotes the number of moles of gas.

R is the gas constant.

T is the temperature of gas.

Boyle’s law:

It is an experimental gas law that describes the relationship between pressure and volume of the gas. According to Boyle's law, the volume of the gas is inversely proportional to the pressure of the system, provided that the temperature and the number of moles of gas remain constant.

If the temperature and number of moles of gas are constant then the equation (1) will become as follows:

[tex]{\text{PV}}={\text{constant}}[/tex]                  …… (2)                                                                                                        

Or it can also be expressed as follows:

[tex]{{\text{P}}_1}{{\text{V}}_1}={{\text{P}}_2}{{\text{V}}_2}[/tex]                        …… (3)                                                                                        

Here,

[tex]{{\text{P}}_1}[/tex] is the initial pressure.

[tex]{{\text{P}}_2}[/tex] is the final pressure.

[tex]{{\text{V}}_1}[/tex] is the initial volume.

[tex]{{\text{V}}_2}[/tex] is the final volume.

Rearrange the equation (3) for [tex]{{\text{P}}_2}[/tex]  , and we get,

[tex]{{\text{P}}_2}=\frac{{{{\text{P}}_1}{{\text{V}}_1}}}{{{{\text{V}}_2}}}[/tex]                      …… (4)                                                                                 

[tex]{{\text{P}}_1}[/tex] is 2.0 atm.

[tex]{{\text{V}}_1}[/tex] is 25 mL.

[tex]{{\text{V}}_2}[/tex] is 100 mL.

Substitute the values of [tex]{{\text{P}}_1}[/tex] , [tex]{{\text{V}}_1}[/tex] and [tex]{{\text{V}}_2}[/tex]  in equation(4).

[tex]\begin{aligned}{{\text{P}}_2}&=\frac{{\left( {{\text{25 atm}}}\right)\times\left({{\text{2 mL}}}\right)}}{{\left({{\text{100 mL}}}\right)}}\\&={\text{0}}{\text{.5 atm}}\\\end{aligned}[/tex]

Learn more:

1. How many atoms of hydrogen are present in 2.92g of a water molecule: https://brainly.com/question/899408

2. Identify the intermolecular forces present between given molecules: https://brainly.com/question/10107765

Answer details:

Grade: Senior school

Subject: Chemistry

Chapter: Ideal gas equation.

Keywords: ideal gas, pressure, volume, temperature, number of moles, initial, final, equation, 25 atm, 2 mL, 100 mL, and 0.5 atm.

Common names for ketones include the names of the alkyl groups attached to the carbonyl group followed by 'ketone'. Ethyl methyl ketone is an example with an ethyl group and a methyl group.

The common names for ketones are typically derived by naming the alkyl groups attached to the carbonyl group, followed by the word ketone. For the ketones listed:

For example, the ketone with four carbon atoms, with an ethyl group and a methyl group on either side of the carbonyl, is commonly known as ethyl methyl ketone.

Answer:

All of the above.

Explanation:

The stirring provides an aid to dissolve. So as compared to a not stirred solution the stirred and vigorously stirred solution will show rapid and more solubility of salt.

In order to study any phenomenon or an experiment we should perform the experiment with same conditions in all the trials. It minimizes the errors.

so we have to keep temperature constant, and the same water container in all the three trials. It gives accuracy to the result

Now the repetition is again required but for precision.

Heat is the transfer of energy from an area of high temperature to one of low temperature until both temperatures become equal (thermal equilibrium). The standard scientific unit for heat is the Joule.

Heat is defined as the transfer of energy between objects or areas due to a temperature difference. It always moves from a region of higher temperature to one of lower temperature. This process continues until the temperatures of the two objects or areas become equal, at which point thermal equilibrium is achieved. In science, the SI unit for heat is the Joule(J).

For example, if you boil water, the energy from the stove (higher temperature) is transferred to the water (lower temperature) causing it to heat up.

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Answer:

The correct answer is decreasing the amount of steam generated.

Explanation:

A nuclear reactor refers to a system in which continuous fission of the heavy nuclear atomic particles occurs with the assistance of the source of the radiation. The energy output can be enhanced by inhibiting the dissipation of heat on the form of steam in the outside surrounding.

Final answer:

Distilled water is a homogeneous mixture, as it is a pure substance with a uniform composition throughout. It is produced by distillation, a process that removes impurities and results in water with consistent properties.

Explanation:

Distilled water is an example of a homogeneous mixture, or more precisely, a pure substance. In the distillation process, water is boiled to produce vapor, which is then condensed back to a liquid form. This process removes impurities and dissolved minerals, resulting in water that is uniform in composition throughout. Distilled water has the same properties and composition in every part of the sample, indicating that it is indeed homogeneous. Unlike heterogeneous mixtures, where components can be physically separated and are not evenly distributed, distilled water's uniformity does not allow for such separation as it is a single compound, H2O, throughout its entirety.

Answer:

yes

Explanation:

because u right

Answer:

0.125 L × 1.5 M = 0.1875 mol HCl

0.1875 mol HCl × 1 mol H2O/1 mol HCl = 0.1875 mol H2O

0.1875 mol H2O × 18 g/1 mol = 3.375 g

0.0875 L × 1.75 M = 0.153 mol NaOH

0.153 mol NaOH × 1 mol H2O/1 mol NaOH = 0.153 mol H2O

0.153 mol H2O × 18 g/1mol= 2.756 g

Solution: 2.76 grams

Explanation:

Answer from Edmentum

In the given reaction, sodium chloride (NaCl) is produced. The sodium loses an electron and becomes positively charged, and the chloride gains an electron and becomes negatively charged. The resulting molecular, complete ionic, and net ionic equations represent this transfer of electrons and the creation of an ionic compound.

In the given reaction, sodium hydroxide (NaOH) and chloride gas (Cl₂) are generated as the products. Here, sodium (Na) atoms lose electrons, identified in scientific terms as undergoing oxidation, and chloride (Cl) atoms gain electrons, a process known as reduction. In the final product, sodium chloride (NaCl), sodium carries a positive charge (+) because it has lost electrons while chloride carries a negative charge (-) as it has gained electrons.

The balanced molecular, complete ionic, and net ionic equations for the process are as follows:

These equations demonstrate the transfer of electrons from sodium to chloride, which results in the formation of an ionic product, sodium chloride.

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