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Use the Internet to list five examples of elements with their properties and five examples of compounds with their properties.

When mercurous nitrate paper is exposed to ammonia gas then black color is produced due to the formation of Hg₂NH₂NO₃ + Hg.

The reaction of mercurous nitrate paper with ammonia gas produces the compound mercury amidonitrate and mercury metal.

This mercury amidonitrate contains the mercury I ion (Hg2^+). Since the compound contains mercury I ion, mercury amidonitrate  has the formula; Hg₂NH₂NO₃.

The compounds formed therefore are; Hg₂NH₂NO₃ + Hg

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Series circuits are mainly used in home appliances. They are also used batteries of some electrical devices other than in holiday lights.

In a series circuits, the electrical components are connected in a series thus in a back to back connection. For example the light bulbs where the second leg of the first bulb is is connected to the first leg of the second bulb and so on.

Resistors are used here to control the current flow and they are also connected in a series fashion. The sum of voltage drops for all the components will be equal to the source voltage. Here we can apply the Ohm's law.

Ohm's law states that the voltage is the product of current and resistance.  Series circuit is also used in batteries and in other households such as in refrigerators.

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The statement regarding ionic bonds is true. Ionic bonds occur when there is a significant electronegativity difference between two atoms, typically greater than 1.7.

This difference causes one atom to give up an electron to the other atom, resulting in the formation of positively and negatively charged ions. These ions are then attracted to each other by their opposite charges, forming an ionic bond. Ionic bonds are typically very strong and require a significant amount of energy to break. They are commonly found in salts, such as sodium chloride, and are important in many biological processes, such as nerve impulses and muscle contractions. The statement "ionic bonds are made when electronegativity differences between two atoms is between 0.5 and 1.7" is not entirely accurate. Ionic bonds typically form when the electronegativity difference between two atoms is greater than 1.7. In this scenario, one atom donates an electron to another, resulting in the formation of positive and negative ions. These oppositely charged ions are then attracted to each other, creating the ionic bond. When the electronegativity difference is between 0.5 and 1.7, a polar covalent bond usually forms, in which electrons are shared unequally between the two atoms.

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The molar concentration of a solution is determined by dividing the number of moles of solute by the volume of the solution in liters.

To find the molar concentration of the sugar solution, we need to follow these steps: Convert the mass of sugar from grams to moles. We can use the molar mass of sugar (342.30 g/mol) to calculate this.
MASS = 79.1 g
Molar mass of sugar = 342.30 g/mol
Number of  = MASS / Molar mass
Number of moles = 79.1 g / 342.30 g/mol
Convert the volume of the solution from milliliters to liters.
VOLUME = 264.0 mL
Volume in liters = VOLUME / 1000
Volume in liters = 264.0 mL / 1000
The molar concentration of the sugar solution is X mol/L.

Then we convert the volume of the solution from milliliters to liters. Finally, we divide the number of moles of sugar by the volume of the solution in liters to calculate the molar concentration. The molar concentration of a solution represents the amount of solute present per unit volume of the solution. In this case, we are calculating the molar concentration of a sugar solution.

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Answer:

Explanation:

The concentration of the sodium hydroxide solution can be calculated by using the balanced chemical equation for the reaction.

1 mole of NaOH reacts with 1 mole of HCl to form 1 mole of NaCl and 1 mole of H2O.

Since 25 cm^3 of 0.1 mol/dm^3 HCl neutralizes 20 cm^3 of NaOH, the number of moles of NaOH present in the solution can be calculated as follows:

0.1 mol/dm^3 HCl * (25 cm^3)/(1000 cm^3/dm^3) = 0.0025 moles HCl

So, the number of moles of NaOH present in 20 cm^3 of the solution is 0.0025 moles.

Finally, the concentration of the NaOH solution can be calculated as follows:

(0.0025 moles NaOH)/(20 cm^3) * (1000 cm^3/dm^3) = 0.125 mol/dm^3

Therefore, the concentration of the sodium hydroxide solution is 0.125 mol/dm^3 (Option C).

Answer:

c... just did it on a.pex

Answer:

O C. T=1/f

Explanation:

The period of a wave is the time taken for the wave to complete a cycle while the frequency of a wave is the number of cycles completed per unit time.

The period (T) is the inverse of frequency (f) and vice versa.

Hence mathematically, i can write;

T=1/f

Rain in New England is 2.57 times more acidic than rain in the Midwestern United States.

The acidity of a solution depends on the concentration of H⁺ ions ([H¹⁺ ]). This concentration can be calculated from pH using the following formula:

pH = -log([H⁺])

american midwest

pH = -log([H⁺])

5.07 = -log([H⁺])

[H⁺] = antilogarithm (-5.07) = 8.51 × 10⁻⁶ M

new england

pH = -log([H⁺])

4.66 = -log([H⁺])

[H⁺] = antilog (-4.66) = 2.19 × 10⁻⁵ M

The concentration ratios are:

\(\frac{2.19 \times 10^{-5} M}{8.51 \times 10^{-6} M} =2.57\)

Rain in New England is 2.57 times more acidic than rain in the Midwestern United States.

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Chlorine is the oxidizing agent while bromine is the reducing agent in the reaction Cl2 (g) + 2Br- (aq) → 2Cl- (aq) + Br2 (g).

A redox reaction is one in which there is loss or gain of electrons. The oxidizing agent gains electrons while the reducing agent loose electrons. Hence oxidation is electron loss while reduction is electron gain.

Given the reaction;

Cl2 (g) + 2Br- (aq) → 2Cl- (aq) + Br2 (g)

The oxidation half reaction is;

2Br- (aq) →  Br2 (g)

The oxidation number of bromine was increased from -1 to zero

The reduction half reaction is;

Cl2 (g) → 2Cl- (aq)

The oxidation number of chlorine was reduced from zero to -1

Hence, chlorine is the oxidizing agent while bromine is the reducing agent.

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The major side effect of ingesting activated charcoal is called as  black stools, option D.

Chemicals can be captured in the pores of activated charcoal. In order to treat some toxins that have been ingested, it is normally administered orally. For additional purposes, the evidence is scant.

Peat, coal, wood, coconut shells, or petroleum can all be used to make charcoal. Charcoal is heated in the presence of a gas to create activated charcoal. The charcoal develops many interior pores as a result of this process. Activated charcoal may trap pollutants thanks to its pores.

To treat poisoning, activated charcoal is frequently employed. Additionally, it is claimed to treat excessive cholesterol, hangovers, and upset stomach, although the majority of these applications lack solid scientific backing.

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The major side effect of ingesting activated charcoal is d) black stools.

While some individuals may experience mild abdominal discomfort, vomiting, or headaches, these side effects are generally less common and less severe. However, it is important to note that activated charcoal should only be consumed under the guidance of a healthcare professional, as it can interact with certain medications and may not be effective for all types of poisoning or overdose. The major side effect of ingesting activated charcoal is d) black stools.  it's crucial to remember that activated charcoal should only be ingested with a doctor's supervision because it may mix with some medications and isn't always helpful for treating poisoning or overdose. Black stools are the main adverse impact of consuming activated charcoal.

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This problem is asking for the ketone that will be formed when an specific alcohol is oxidized with chromic acid. Although there is no attached file or molecule, you should select the secondary alcohol.

In organic chemistry, oxidation reactions such as those producing aldehydes and carboxylic acids from primary alcohols and those producing ketones from secondary alcohols are based on either the increase of oxygen atoms or the decrease of hydrogen atoms in the molecule.

However, primary carbons are those having one bond with another carbon atom, and they lead to the formation of aldehydes and carboxylic acids as shown below:

\(R-CH_2-OH\rightarrow R-HC=O\rightarrow R-C(=O)-OH\)

On the other hand, secondary alcohols are those having the OH at a carbon with two bonds with two different carbon atoms and lead to formation of ketones upon the oxidation with chromic acid:

\(R_1-CH(OH)-R_2\rightarrow R_1-C(=O)-R_2\)

In such a way, you must select the secondary alcohol for your answer, regardless not included in the question you shared.

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The question requires us to calculate the energy, in joules (J), necessary to heat 83.5g of water from 26.7 °C to 75°C.

The heat energy (Q) can be calculated from the mass of the sample (m), its specific heat capacity of the substance (C) and temperature variation (ΔT), as given by the following equation:

Since the question did not provide a value for the specific heat capacity of water, we'll adopt the value 4.182 J/g.°C. Applying the values provided by the question, we can calculate the heat energy as:

Therefore, the heat energy necessary to heat the amount of water given grom 26.7 to 75°C is 1.69 x 10^4 J (or 16900 J).

Answer:

If I think this is the same question then the answer is "scientists still debate this"

Explanation: First of all I just took the test. and second light can be both a particle and a wave because of quantum mechanics, I believe einstein came up with the idea.

Answer:

acid

Explanation:

7 is neutral if more than 7 add acid if less than 7 add alkali

Answer:

The chemical energy in food can be converted to another form of chemical energy when it is stored as glucose or fat. It can be converted to thermal energy because our body produces heat when digesting our food. The chemical energy in our food can also be converted to mechanical energy in the form of muscle movement.

PUT IN YOUR OWN WORDS!!!

Answer:

The definition of tentative is not definite or final. An example of tentative is possible, though not definite, plans to go to the movies sometime on Friday.

four

Explanation:

four significant figures in 0.4004 ml

Answer:

Option D, Index fossil helps scientists to determine the relative ages of rocks by their positions

Explanation:

Index fossils are arranged in layer in such a way that the lowest layer represent the oldest fossil and the top most layer represents the youngest fossil. Scientist use this concept to determine the relative age of the rocks based on their position beneath the earth’s surface

Hence, option D is correct

The value of ΔH for the reaction CO(g) + H₂(g) + O₂(g) → CO₂(g) + H₂O(g) is -1272 kJ.

To calculate the enthalpy change (ΔH) for the given reaction, we can use Hess's law, which states that the overall enthalpy change of a reaction is equal to the sum of the enthalpy changes of the individual reactions involved.

Given the enthalpy changes:

1. 2 C(s) + O₂(g) → 2 CO(g)... ∆H = -222 kJ

2. C(s) + O₂(g) → CO₂(g)... ∆H = -394 kJ

3. 2 H₂(g) + O₂(g) → 2 H₂O(g)... ∆H = -484 kJ

We need to manipulate these reactions to obtain the desired reaction:

1. Reverse reaction 2: CO₂(g) → C(s) + O₂(g)... ∆H = +394 kJ

2. Multiply reaction 2 by 2 to balance carbon atoms: 2 CO₂(g) → 2 C(s) + 2 O₂(g)... ∆H = -788 kJ

3. Leave reaction 3 unchanged: 2 H₂(g) + O₂(g) → 2 H₂O(g)... ∆H = -484 kJ

By adding reactions 2 and 3, we obtain the desired reaction:

CO(g) + H₂(g) + O₂(g) → CO₂(g) + H₂O(g)... ∆H = -788 kJ + (-484 kJ) = -1272 kJ

Therefore, the value of ΔH for the given reaction is -1272 kJ.

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Answer:

Explanation:

Here, we want to get the mass required to make the given volume

To get this we need to get the number of moles

To get the number of moles, we have to multiply the volume by the molarity

Mathematically, we have that as:

The volume can be converted to liters by dividing by 1000

So we have the volume as 311/1000 = 0.311 L

Thus, we have the number of moles as:

To get the mass, we have to multiply the number of moles by the molar mass

The molar mass of NaCl is 58.44 g/mol

Thus, we have the mass as:

In terms of its properties, Jim's iron magnet was no longer magnetic when he dropped it because it underwent a physical change - demagnetization.

Physical changes are changes that only affect the physical properties of a substance and are easily reversible. They occur by physical means and do not affect any of the chemical properties of a substance. This is what makes them easily reversible because they are reversed by physical means. From the example in the question, Jim's magnet, although losing its magnetic properties is still made of iron.

Magnetization and demagnetization are physical properties because they produce no new substance and are easily reversible. One can make magnet can lose its magnetic properties by hitting it, as in the case of Jim's magnet. When it fell down, it suffered a major hit, which made it non - magnetic.

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Answer:

According to the law of conservation of matter, the mixture should weigh 175 g

Explanation:

The law of conservation of matter is one of the basic guiding principles of chemical reactions.

It states that matter is neither created nor destroyed but can be converted from one form to another.

Although this law has been faulted with advances in science and technology, it is still found basically useful.

So applying the law to the question at hand, it is expected that all the mass of the sugar gets added to all the mass of the water

This brings the total mass to 25 + 150 = 175 grams

The weight of the mixture of sugar and water has been 175 grams.

The law of conservation of mass has been based on the fact that the mass has neither been created and nor destroyed.

The law of conservation of mass stated the combination of the two compounds results in the final solution being the sum of the two reactants.

For example, the mass of a solution of compounds A and B will be:

Mass of A + Mass of B = Mass of solution

The sugar solution formed has been consisted of:

Sugar = 25 grams

Water = 150 grams.

According to the law of conservation of mass, the weight of the mixture has been:

Weight of mixture = Weight of sugar + Weight of water

Weight of mixture = 25 grams + 150 grams

Weight of mixture = 175 grams.

The weight of the mixture of sugar and water has been 175 grams.

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Actually Welcome to the Concept of the Chemical bonds.

Due to the presence of dipole-dipole forces, polar covalent molecules like water tend to be _____ at room temperature.

The answer is Liquids

Water tends to be liquids at the room temperature.

Answer:

Explanation:

0.25 M

The molarity of a solution will be 4.27M .

Molarity (M), often known as molar concentration, is the concentration of a solution expressed in moles of solute per liter of solution.

Solution can be considered as a mixture of more than one component. It may be homogeneous solution as well as heterogeneous solution.

Gram to mole conversion:

\(=\;2.75\;g.\;\frac{1\;mol}{58.44g} \\=\;0.0470 \;mol\)

Molarity of the solution can be calculated by using the following formula:

It is calculated that, moles of solute = 0.0470 mol, volume of the solution = 1100 mL.

Now, put the value of given data in molarity formula:

\(Molarity=\frac{Moles\;of\;the\;solute}{Volume \;of\; the\; solution} \\=\frac{0.0470\;mol}{1100 \;mL} \\=\;4.27\;mol/mL\\=\;4.27\; M\)

Therefore,  the molarity of a solution will be 4.27M.

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Answer: The concentration of Cr3 needed to achieve a cell potential of 0 V is 0.0310 M.

To calculate the concentration of Cr3 needed for the overall cell potential to be 0 V, you will need to use the Nernst equation. The equation is as follows: Ecell = E°cell - (2.303 RT/nF) * lnQ, where Ecell is the cell potential, E°cell is the standard cell potential, R is the gas constant, T is the temperature, n is the number of moles of electrons involved in the reaction, and F is the Faraday constant.

Given the information in the question, the concentration of Zn2 is 0.10 M, you can calculate the concentration of Cr3 needed to achieve a cell potential of 0 V:

Ecell = 0 V

E°cell = E°cell (given)

R = 8.314 J/K•mol

T = 298 K (room temperature)

n = 2 (number of moles of electrons involved)

F = 96485 C/mol

Substituting these values into the equation, you get: 0 = E°cell - (2.303 * 8.314 * 298/2*96485) * lnQ.

Solving for Q (the reaction quotient), you get

Q = (E°cell/2.303RT/nF)

= (1.1V/2.303 * 8.314 * 298/2*96485)

= 0.0310 M.

Therefore, the concentration of Cr3 needed to achieve a cell potential of 0 V is 0.0310 M.



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Answer: a compound!

Explanation: a compound is something that contains two or more elements that are chemically combined in a fixed proportion!