A piece of an unknown substance has a volume of 2.5 mL and a mass of
20 grams. What is the density of this substance?

Answer:

B. Litmus paper

Explanation:

The test for chlorine can use either type of litmus paper, but blue litmus paper is used most commonly. The litmus paper must be damp - the water dissolves some of the chlorine so that it can react with the indicator on the litmus paper. This test shows that chlorine is a powerful bleach.

In comparison to modern, highly accurate density meters or pycnometers, hydrometers are far less accurate and temperature.

Thus,  Although they require very large sample sizes, hydrometers are rather simple to operate. Usually, 300 to 500 ml per measurement are required. Hydrometers frequently require calibration off-site as well.

With measurements taken by eye, user error is a major issue, and temperature management is especially challenging. Inaccurately bringing and maintaining samples at temperature might take a long time, and once more, user perception of temperature levels is used to determine temperature levels.

Pycnometers and hydrometers have a further problem in that the findings of alcohol measurement are challenging to evaluate and record.

Thus, In comparison to modern, highly accurate density meters or pycnometers, hydrometers are far less accurate and temperature.

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It carries at least one hydroxyl functional group ( i.e -OH ) bound to a saturated carbon atom.

Therefore the functional group present is -OH functional group.

Answer:

Carboxylic acid

Explanation:

The color of the object appears as yellow/orange.

The visible light spectrum spans a wavelength range of 400 to 700 nanometers (nm), with shorter wavelengths appearing as blue or violet and longer wavelengths as red.

This object is absorbing light with wavelengths between 430 and 400 nm, indicating that it is absorbing light that is visible in the blue and violet spectrum.

We know that this color that we see is actually a complementary color to blue/violet from the color wheel.

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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Polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore, when any solute dissolves in a solvent, then the nature of solute and solvent is same.

Solubility shows the extent of solubility of a solute in solvent to make a solution. Solute is substances that is present in small amount. solvent is a substance that is present in large amount. Its SI unit is gram per litre or g/L.

Bond strength affect the solubility of a solute in solvent. weaker the bond strength is, more the solubility is. The weaker bond can be easily broken by water molecule.

Polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. when any solute dissolves in a solvent, then the nature of solute and solvent is same.

Therefore, when any solute dissolves in a solvent, then the nature of solute and solvent is same.

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As per the temperature, the molecules of a substance act differently. The melting point is -114.2 °C and The boiling point of hydrogen chloride (HCl) is -85.05 °C. The correct sketch in each set is as follows:

Thus, if the temperature is kept above  -85.05 °C, the molecules will be placed widely apart and will be in the gaseous state, revealing their properties.

If the temperature is between -114.2 °C and -85.05 °C, the molecules will be organized in layers capable of slipping over one another since they will be in a liquid state.

At last, the molecules will be arranged in an orderly manner because they will be in a solid state if the temperature is below -114.2 °C.

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Answer:

b!

Explanation:

Answer:

c - both rock types

Explanation:

when weathered and eroded they can become sediments!

The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer:

Mass=Moles × RFM

Mass= 0.28M× 164

Mass= 45.92 grammes

Answer:  \([Ni(NH_3)_3Br]Cl\) and \([Ni(NH_3)_3Cl]Br\) are ionization isomers.

\([Pt(Cl)_2(SCN)_4]^{4-}\) and \([Pt(Cl)_2(NCS)_4]^{4-}\) are linkage isomers.

Explanation:

Ionization isomerism occur when a ligand that is bound to the metal center exchanges places with an anion or neutral molecule that was originally outside the coordination complex

Thus \([Ni(NH_3)_3Br]Cl\) and \([Ni(NH_3)_3Cl]Br\) are ionization isomers.

Linkage isomerism is the existence of coordination compounds that have the same composition differing with the connectivity of the metal to a ligand.

Thus \([Pt(Cl)_2(SCN)_4]^{4-}\) and \([Pt(Cl)_2(NCS)_4]^{4-}\) are linkage isomers.

Answer:

metallic bonds

Explanation:

atoms in a metallic solid loose their outer electrons and form a regular lattice of positive metallic ions.

The chemical bondings are present between the atoms due to the attractive forces. The bond shown in the diagram represents the metallic bonds. Thus, option A is correct.

A metallic bond is a chemical bonding present due to the electrostatic attractive forces present between the delocalized electrons and the ions of the metals.

The metal produces cations that bond with the electrons delocalized around them. This type of bonding accounts for the malleability and conductivity of the metallic species.

The delocalized electrons are shared by the positively charged metal ions. The cations are largely spread in space. It is seen in the elements of aluminum, magnesium, copper, sodium, zinc, calcium, etc.

Therefore, option A. the metallic bond is seen in the diagram.

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Given :

Volume of \(Fe^{2+}\) , V = 132 mL .

Molarity of \(Fe^{2+}\), M = 0.1782 M .

To Find :

How many milliliters of 0.2937 M \(K_2Cr_2O_7\) are required to titrate 132.0 mL of 0.1782 M \(Fe^{2+}\) solution .

Solution :

Moles of  \(Fe_2\) :

\(n=0.1782\times \dfrac{132}{1000}\ mol\\\\n=0.264\ mol\)

Now , 1 mole of \(K_2Cr_2O_7\) reacts with 6 mole of \(Fe^{2+}\) .

So , moles of \(K_2Cr_2O_7\) required is :

\(N=\dfrac{0.264}{6}=0.044\ mol\)

Volume required is :

\(V=\dfrac{N}{M}\\\\V=\dfrac{0.044}{0.2937}\ L\\\\V=0.15\ L=150\ mL\)

Hence , this is the required solution .

Answer:

...

Explanation:

The birth weight of cats at the 90th percentile would be approximately 3.7 ounces. b. The birth weight of cats at the 10th percentile would be approximately 2.3 ounces.

There are three main methods of calculating weight:

1. Balance Beam Scale: A balance beam scale is an example of a mechanical weighing system. It uses a set of calibrated weights to measure the weight of an object.

2. Digital Scale: A digital scale uses an electronic or digital readout to display the weight of an object.

3. Calipers: Calipers are devices used to measure the distance between two points, such as thickness or diameter. They come in various sizes and shapes, depending on the type of measurement the user wants to take.

Birth weight is the weight of a baby at the time of birth. It is usually measured soon after delivery, with a special baby scale, though sometimes the baby's weight is estimated. The normal range of birth weight is anywhere between 5 lbs 8 oz and 10 lbs, though preterm or premature babies may be significantly lighter. A baby's birth weight is important because it can provide a clue to the baby's overall health. High birth weights may indicate an underlying medical condition, and low birth weights can be a sign of premature or difficult delivery and health risks associated with such a delivery.

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Answer:

16.5 kilometers is your answer

Answer:

16.5

Explanation:

The new net worth of the person is equal to 80.2 × 10⁹.

Significant figures can be used to generate numbers that will be written in the form of digits. We can also evaluate the number of significant digits by counting the numbers from the 1st non-zero digit placed on the left.

In the case of addition or subtraction, the number of significant figures will be the same as the value with the fewest significant digits.

Given, the net worth of the person, A = 77 billion = $ 77 × 10⁹

The person's stock gains in the following year, I = $ 3.20 billion

I = $ 3.20 × 10⁹

The new net worth of the person, A(new) = A + I

A (new) = 77 × 10⁹ + 3.20 × 10⁹

A (new) = $ 80.2 × 10⁹

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The time of moonrise changes by approximately 50 minutes each day during its 29.5-day cycle.

To find this, you can divide the 24-hour change in moonrise time by the number of days in the cycle (29.5).

24 hours / 29.5 days = 0.81 hours/day = 49.26 minutes/day.

The Moon is the Earth's only natural satellite and is approximately 238,855 miles away from Earth.

It is about one-quarter the size of Earth and is the fifth-largest moon in the Solar System. The Moon's surface is covered in craters, mountains, and valleys, and it has no atmosphere or water. The Moon's phases, which include the new moon, crescent moon, first quarter moon, gibbous moon, full moon, and last quarter moon, occur due to its orbit around Earth.

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Answer:

A third type of circuit involves the dual use of series and parallel connections in a circuit; such circuits are referred to as compound circuits or combination

Explanation:

Answer:

D

Explanation:

Elements in the same group (vertical columns) have the same number of valence electrons. These elements behave similarly because they will either give up or take the same number of electrons to fill their valence shell. Since potassium has 1 valence electron, it will most likely give up one electron. Out of all of the answer options, the only element that is in the same group as potassium is francium.

Answer:

D. Francium (Fr)

Explanation:

Just did it!!

Answer:

They never cross with one another. They have the same strength. They seek the path of least resistance between opposite.

Explanation:

The main characteristic of a magnet is that they attract or repel other objects without touching. The attraction and repulsion depend upon the property of the object. We feel like the magnet pushes the object when it is repelling and pulls if it is attracting.

The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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Answer:

A DC power supply, commutator, rotor armature, axle, and a field magnet.

I am quite concerned about the pharmaceuticals being mistakenly or purposefully flushed down drains polluting our rivers.

It is a significant issue that is harmful to the environment, animals, and public health. Drug contamination may cause major health issues for people, animals, and plants by contaminating the water, soil, and even the air.

Fish and other aquatic creatures can also absorb the medications, which can cause mutations, malformations, and even death. To safeguard the health of all living things and our environment, this is a problem that has to be addressed.

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The volume of a liquid is not substantially affected by variations in pressure. Any pressure increase can only slightly shorten the distance between the densely packed molecules, liquids are incompressible.

Increased pressure occurs as depth increases. The pressure in a liquid is influenced by the mass of the surrounding water above. Due to the near proximity of the molecules in a liquid, pressure exerts itself in all directions.

"Pressure" is described as the thrust (force) applied to a surface per area. The force to effective area is another way to describe it (over which the force is acting).

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The oxidation state of nitrogen (N) in NaNO3 is +5. option B

To determine the oxidation state of nitrogen (N) in sodium nitrate (NaNO3), we need to assign oxidation numbers to each element in the compound.

In NaNO3, we know that the sodium ion (Na+) has a +1 oxidation state because it is an alkali metal. Oxygen (O) typically has an oxidation state of -2 in compounds, and there are three oxygen atoms in NaNO3. Since the compound is neutral, the sum of the oxidation states must be zero.

Let's assume that the oxidation state of nitrogen is x. Therefore, we can set up the equation:

(+1) + x + (-2) * 3 = 0

Simplifying the equation:

+1 + x - 6 = 0

x - 5 = 0

x = +5

Therefore, the oxidation state of nitrogen (N) in NaNO3 is +5.

The oxidation state of an element indicates the number of electrons it has gained or lost in a compound. In this case, the nitrogen atom in NaNO3 has gained five electrons to achieve a stable oxidation state of +5.

It is important to note that oxidation states are formal charges and do not necessarily represent the actual distribution of electrons in a compound. They are assigned based on a set of rules and can be useful in understanding the reactivity and behavior of elements in chemical reactions.

Option B

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Answer:

What sub

Explanation:

The equilibrium concentration of NO₂ is 0.241 M at this temperature.

According to the given balanced chemical reaction:

2NO(g) + O₂(g) ⇌ 2NO₂(g)

ΔH° = -112kJK

= 0.5

Equilibrium concentrations are

[NO] = 0.31 M,

[O2] = 1.10 M,

[NO2] = [?]

Let the equilibrium concentration of NO₂ be x.

Thus, the equilibrium concentrations of NO and O₂ are given by:  

[NO] = 0.31 M

[O2] = 1.10 M

The equilibrium constant Kc is given by:

Kc = [NO₂]²/[NO]²[O₂]

Kc = [NO₂]²/[NO]²[O₂]

Kc = x²/(0.31)²(1.10)

Substituting the values in the expression of Kc, we get;

0.5 = x²/(0.31)²(1.10)

Now, solving for x;

x² = 0.5 × (0.31)²(1.10)

x = √((0.5 × (0.31)²(1.10)))

x = 0.241 M

Therefore, the equilibrium concentration of NO₂ is 0.241 M at this temperature.

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