which of the pairs of compounds below is most likely to form a solution when mixed? view available hint(s)for part a which of the pairs of compounds below is most likely to form a solution when mixed? heptane (c7h16) and acetonitrile (h3ccn) water and ammonia (nh3) sodium chloride (nacl) and pentane (c5h12) ammonia (nh3) and isooctane (c8h18)

Solar panels were invented by Charles Fritts, Daryl Chapin, Calvin Fuller, and Gerald Pearson.Solar panels were invented to produce clen and cheap energy from solar energy.

Solar panels are devices which are designed to trap the energy of sunlight or solar energy and store it in the form of chemical energy in inverters which is then converted to electrical energy.

In 1883, the American inventor Charles Fritts designed the first solar cells from selenium. Other subsequent inventors who improved on the design are Daryl Chapin, Calvin Fuller, and Gerald Pearson.

Solar panels were invented to produce energy used in homes and industries from solar energy.

Solar panels are used to generate electrical energy used in homes and industries today.

In conclusion, solar panels produce an alternative from of clean and cheap energy from the sun.

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The number of moles of the water produces by the 1.3 moles of O₂ is 1.00 mol of H₂O. The correct option is C.

The chemical equation is as :

2C₄H₁₀  +  13O₂  ---->  8CO₂ + 10H₂O

The moles of the O₂ = 1.3 moles H₂O

The molar mass of the O₂ = 32 g/mol

2 moles of the C₄H₁₀ produces the 10 moles of the water,

13 moles of O₂ produces the 10 moles of H₂O

The moles of the H₂O = (10/13) × 1.3

The moles of the H₂O = 1 mol

The number of moles of the water is 1 mol of the H₂O and the moles of the oxygen that is O₂ is the 1.3 moles.. Therefore, the correct option is C.

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Answer:

I believe it is C.Shelter.

Answer:

C

Explanation:

The butterflies use the trees for shelter, because the trees protect them from the weather and the cold air.

Answer:

Xenon is element 54. in a perfect atom it would have 54 neutrons

Answer:

refer to explanation in order V

Explanation:

Atomic number: 54

Protons: 54

Electrons: 54

Neutrons: 77

Mass Number: 131.293 U

6 (1/2): At the upper left is the atomic number, or number of protons. In the middle is the letter symbol for the element (e.g., H). Below is the relative atomic mass, as calculated for the isotopes found naturally on Earth. At the very bottom is the name of the element (e.g., hydrogen).

6 (2/2): On the periodic table, the mass number is usually located below the element symbol.

I hope this helped!

Answer:

To investigate the presence of lithium ions and carbonate ions in the tablet, the following steps can be taken:

Materials needed:

Lithium carbonate tablet

Metal wire

Dilute hydrochloric acid

Limewater

Bunsen burner

Test tubes

Procedure:

Take a small piece of the lithium carbonate tablet and place it on a metal wire.

Hold the wire over a Bunsen burner flame until the sample turns red.

Allow the sample to cool and place it in a test tube.

Add dilute hydrochloric acid to the test tube and observe any gas that is produced.

Pass the gas produced through limewater in a separate test tube and observe if there is any change in the color of the limewater.

Results:

If a red flame is observed in step 2, it indicates the presence of lithium ions in the sample.

If gas is produced in step 4, it indicates the presence of carbonate ions in the sample.

If the limewater turns cloudy or milky in step 5, it indicates the presence of carbonate ions in the sample.

Therefore, the student can conclude that the lithium carbonate tablet contains lithium ions and carbonate ions.

The highest boiling point based on the data is option 4

Compared to alcohols of comparable molecular weight, carboxylic acids often have higher boiling temperatures. Between the hydrogen atoms of adjacent molecules and the oxygen in the carboxyl group of carboxylic acids, strong intermolecular hydrogen bonds can develop. Because it takes more energy to break the intermolecular interactions and change the substance from a liquid to a gas during boiling, these hydrogen bonds help materials have higher boiling temperatures.

Although carboxylic acids and alcohols are both capable of forming hydrogen bonds, carboxylic acids have higher boiling temperatures due to the extra carboxyl group that they contain.

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Answer:

Rubidium oxide

Explanation:

Answer:

8 ATM

Explanation:

P1 V1 = P2 V2

P1 V1 / V2 = P2

1 * 2 / .25 = 8 ATM

This is an exercise of Equation of state of an ideal gas.

To start solving this exercise, we obtain the following data:

The gas law is derived from the gas law of Boyle, Charles, Gay Lussac and General.

This means that if the volume is doubled the pressure is reduced by half, and if the pressure is made three times greater, the volume will be one third of what it was originally which can be summarized in the equation.

P₁V₁=P₂V₂ ⇒ General Formula

Where:

The word inversely proportional means: "That if the pressure increases the volume decreases but proportionally".

We clear formula for final pressure:

\(\bf{P_{2}=\dfrac{P_{1}V_{1}}{V_{2}} \ \ \to \ \ \ Formula }\)

We clear our data in the formula:

\(\bf{P_{2}=\dfrac{(1.0 \ atm)(2.0\not{l})}{0.25\not{l}} }\)

\(\bf{P_{2}=8 \ atm}\)

If the volume is reduced to 0.25 liters, the new pressure of the gas will be 8 atm.

Answer:

48 g C

Explanation:

To find the grams, you need to (1) convert atoms to moles (using Avogadro's Number) and then (2) convert moles to grams (using atomic mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 2 sig figs to match the sig figs of the given value.

Avogadro's Number:

6.022 x 10²³ atoms = 1 mole

Atomic Mass (C): 12.011 g/mol

2.4 x 10²⁴ atoms C                   1 mole                       12.011 g
-----------------------------  x  --------------------------------  x  ---------------  =  48 g C
                                         6.022 x 10²³ atoms           1 mole

Answer:

The answer is A, Neutron adds only mass

To answer this question we have to use the rule of dilutions:

Where C1 and C2 are the initial and final concentrations and V1 and V2 are the initial and final volumes, respectively. In this case we have to find C2 and the other values are given:

It means that the answer is 0.052M.

To calculate the moles of H+ and OH-, you need to know the concentration of the solution in terms of its pH or pOH value.

When you get the pH of the solution, you can use this formula to calculate the concentration of H+ ions: [H+] = 10^(-pH)

Also, if you know the pOH of the solution, you can use this formula to calculate the concentration of OH- ions: [OH-] = 10^(-pOH)

Having determined the concentration of H+ and OH- ions, the molarity formula can be used to calculate the number of moles of each ion as follows: moles = concentration (in mol/L) x volume (in L)

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The periodic table of elements has vertical groups that tell you the number of electrons and horizontal periods that tell you the number of valance shells. The chemical elements are arranged in the periodic table according to their atomic numbers, starting with hydrogen, which has the lowest atomic number, and moving up to uranium, which has the greatest atomic number.

Due to their comparable chemical behavior, the periodic table's vertical columns are referred to as groups or families. The number of valence electrons and chemical characteristics is the same for all members of a family of elements. Periods refer to the horizontal rows on the periodic table.

The contemporary periodic table has 18 vertical columns and 7 horizontal periods.

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Answer:

0.636 moles of CO2

Explanation:

The molar mass of CO2 is 44.01 g/mol (12.01 g/mol for one carbon atom and 2 x 16.00 g/mol for two oxygen atoms). To find the number of moles in 28g of CO2, you can divide the mass by the molar mass: 28g / 44.01 g/mol = 0.636 moles of CO2.

Answer:

Neutrons.

Explanation:

Isotopes can be defined as the atom of an element that has the same number of protons but different number of neutrons. This ultimately implies that, the isotopes of an element have the same atomic number (number of protons) but different atomic mass (number of nucleons).

The isotope of an element is denoted by \( X^{A}_{Z}\)

Where; X is the symbol of the element.

A is the atomic mass or number of nucleons.

Z is the atomic number or number of protons.

Therefore, the number of neutrons = A - Z

Isotopes of carbon differ with respect to the number of neutrons.

Basically, there are three (3) Isotopes of Carbon and these are;

1. Carbon-12: it has an atomic mass of 12 with 6 numbers of proton and neutron respectively.

2. Carbon-13: it has an atomic mass of 13 with 6 numbers of proton and 7 numbers of neutron.

3. Carbon-14: it has an atomic mass of 14 with 6 numbers of proton and 8 numbers of neutron.  

The decomposition of aspirin (acetylsalicylic acid,\(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)).

The decomposition of aspirin (acetylsalicylic acid, \(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)). To determine the moles of each product formed, we need to consider the balanced chemical equation for the reaction:

\(C_{9} H_{8} O_{4} = > C_{7} H_{6}O_{3} +CH_{3} COOH\)

From the equation, we can see that for every 1 mole of aspirin, 1 mole of salicylic acid and 1 mole of acetic acid are produced.

Therefore, the moles of salicylic acid and acetic acid formed will be equal to the number of moles of aspirin that decomposes. If we know the amount of aspirin in moles, we can directly calculate the moles of each product based on stoichiometry.

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Answer:

When conducting a chemistry lab experiment using chalk (calcium carbonate) in vinegar (acetic acid), there are several limitations and precautions to be aware of:

Limitations of chalk in vinegar chemistry experiment:

Reaction rate: The reaction between chalk and vinegar is relatively slow, which may require a longer observation period or higher concentration of vinegar to observe significant changes within a reasonable time frame.

Solubility: Chalk may not dissolve completely in vinegar, resulting in incomplete reaction or difficulty in obtaining accurate results.

Product formation: The reaction between chalk and vinegar produces carbon dioxide gas, water, and calcium acetate. The carbon dioxide gas may escape into the atmosphere, leading to loss of product and inaccurate measurements.

pH: Chalk is a basic substance, and the reaction with vinegar, which is acidic, may result in neutralization, leading to a decrease in the overall acidity of the reaction mixture.

Precautions to take in chalk in vinegar chemistry experiment:

Ventilation: The reaction between chalk and vinegar produces carbon dioxide gas, which can displace air and potentially cause asphyxiation in a closed or poorly ventilated area. Conduct the experiment in a well-ventilated area or under a fume hood to ensure adequate air circulation.

Eye and skin protection: Vinegar is an acid and can cause skin and eye irritation. Wear appropriate personal protective equipment (PPE), such as gloves and goggles, to protect yourself from contact with vinegar or any other chemicals used in the experiment.

Chemical handling: Handle the chemicals, including chalk and vinegar, with care, following proper lab safety protocols. Avoid ingestion, inhalation, or direct contact with the chemicals, and dispose of them properly according to local regulations.

Accuracy in measurements: Use calibrated and accurate measuring tools, such as graduated cylinders or burettes, to measure the amount of chalk, vinegar, and other reagents accurately. This will ensure the reliability and accuracy of the experimental results.

Observations: Make careful and detailed observations during the experiment, noting any changes in appearance, gas evolution, or other relevant observations. Take measurements at appropriate intervals and record the data accurately for analysis and interpretation.

It is important to follow good laboratory practices, including proper chemical handling, accurate measurements, and cautious observations, to ensure safe and reliable results in a chalk in vinegar chemistry lab experiment. Consult with a qualified instructor or supervisor for specific guidelines and precautions related to your experiment.

The order of reaction is defined as the power to which the concentration of the reactants are raised in the rate equation of the reaction.

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Answer:

185.49 grams of Zinc would react with 454g (1lb) of copper sulfate

Explanation:

Yo know the following balanced reaction:

CuSO₄(aq)+ Zn(s) →Cu(s) + ZnSO₄(aq)

You can see that by stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reagents and products are part of the reaction:

Being:

the molar mass of the compounds participating in the reaction is:

Then, by stoichiometry of the reaction, the following amounts of mass of reagent and product participate in the reaction:

Now you can apply the following rule of three: if 160 grams of CuSO₄ react with 65.37 grams of Zn by this reaction stoichiometry, 454 grams of CuSO₄ with how much mass of Zn will it react?

\(mass of Zn=\frac{454 grams of CuSO_{4} *65.37 grams of Zn}{160 grams of CuSO_{4}}\)

mass of Zn= 185.49 grams

185.49 grams of Zinc would react with 454g (1lb) of copper sulfate

The Mass percent composition of F - in NaF is 45.25% .

2.323 g must be added to 1500 L of water to fluoridate it at a level of 0.7 mg.

Mass percent composition describes the relative quantities of elements in a chemical compound.

The given data is:

Volume of water = 1500 L

Amount of F- ion = 0.7 mg/L

Atomic weight of F = 19 g/mol

Number of  moles of F- in 1 L of water = 0.7 x 10⁻³ g/19 g mol⁻¹ = 3.684x 10⁻⁵ moles

Therefore, the number of moles of F- in 1500 L of water = 3.684 x 10⁻⁵  x  1500 = 0.0553 moles

1 mole of NaF has 1 mole of Na+ and 1 mole of F-

hence, the number moles of NaF required = 0.0553 moles

Molar mass of NaF = 23 +19 = 42 g/mol

Mass of NaF required = 0.0553 moles x 42 g/mol = 2.323 g

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Answer:

The excess energy over that needed for dissociation is 3.712 × 10⁻¹⁹ J

Explanation:

Given the data in the question;

wavelength of proton λ = 231 nm = 231 × 10⁻⁹ m

we determine the energy of the proton;

E = hc / λ

where h is plank constant ( 6.626 × 10⁻³⁴ JS )

and c is the speed of light ( 3 × 10⁸ m/s )

we substitute

E = [ ( 6.626 × 10⁻³⁴ JS ) × ( 3 × 10⁸ m/s ) ] / [ 231 × 10⁻⁹ m ]

E = 8.61 × 10⁻¹⁹ J

we know that, bond energy for H-I is 295 kJ/mol

so, H = 295 × 10³ J/mol

Now, energy to dissociate HI will be;

⇒ H / N

where N is the Avogadro's number ( 6.023 × 10²³ mol⁻¹ )

energy to dissociate HI = ( 295 × 10³ J/mol ) / ( 6.023 × 10²³ mol⁻¹ )

= 4.898 × 10⁻¹⁹ J

Therefore, Excess energy over dissociation will be;

⇒ ( 8.61 × 10⁻¹⁹ J ) - ( 4.898 × 10⁻¹⁹ J )

= 3.712 × 10⁻¹⁹ J

The excess energy over that needed for dissociation is 3.712 × 10⁻¹⁹ J

Answer: 1.67 kg

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

\(Q=m\times c\times \Delta T\)

Q = Heat absorbed=\(4.31\times 10^1kJ\) = \(43100J\)   (1kJ=1000J)

m= mass of substance = ?

c = specific heat capacity = \(0.385J/g^0C\)

Change in temperature ,\(\Delta T=T_f-T_i=6.71\times 10^1^0C=67.1^0C\)

Putting in the values, we get:

\(43100J=m\times 0.385J/g^0C\times 67.1^0C\)

\(m=1670g=1.67kg\)   (1kg=1000g)

Thus the mass (in kg) of the copper sample is 1.67

Answer: It is the principle that matter cannot be created or destroyed.

Explanation:

Answer:

Oxygen exits the leaf.

1a. The volume (in cm³) of the block is 1042.734 cm³

1b. The volume (in L) of the block is 1.04 L

1c. The density (in g/mL) of the block is 0.907 g/mL

1d. The block will not sink

The volume of the block in cm³ can be obtained as follow:

Volume of block = dimension

Volume of block = 11.1 cm × 154 mm × 0.061 m

Volume of block = 11.1 cm × (154 / 10) cm × (0.061 × 100) m

Volume of block = 11.1 cm × 15.4 cm × 6.1 cm

Volume of block (in cm³) = 1042.734 cm³

The volume of the block in L can be obtained as follow:

1000 cm³ = 1 L

Therefore,

1042.734 cm³ = (1042.734 cm³ × 1 L) / 1000 cm³

1042.734 cm³ = 1.04 L

Thus, we can say that the volume of block (in L) is 1.04 L

We can obtain the density in g/mL as shown below:

Density = mass / volume

Density of block = 9.46×10² / 1042.734

Density of block = 0.907 g/mL

First, we shall determine the density of the liquid. Details below:

Density = mass / volume

Density of liquid = 724.11 / 780

Density of liquid = 0.928 g/mL

Now, we shall compare the density of the block and liquid to detect whether or not the block will sink. Details below:

Since the density of the block is smaller than that of the liquid, the block will not sink in the liquid.

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The oxidation number of chlorine in KClO3 is +5 (option A).

The oxidation number of an element is the hypothetical charge of an atom within a molecule.

The oxidation number of an element like chlorine in a compound like Pottasium chlorate can be calculated as follows:

The oxidation number of the elements in KClO3 is as follows:

1 + x - 2(3) = 0

x - 5 = 0

x = +5

Therefore, the oxidation number of chlorine in KClO3 is +5.

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Answer: 0.004225

Explanation:

convert ml into liter

1 liter = 1000ml

32.5 ml = 0.0325 lit

Now, we can get our answer by solving as follows;

Moles = Molarity multiplied by Liters

moles = 0.130 x 0.0325 =  0.004225

answer = 0.004225