Which best describes how many
Americans depend on groundwater
for drinking water source?
A. Very few
B. About half
C. Almost everyone

Some types of solids that are insoluble in water are:

Many solids are insoluble in water, meaning they do not dissolve in water to a significant extent. Here are some examples of common solids that are generally insoluble in water:

Metals: Most metals, such as gold, silver, platinum, and copper, are insoluble in water.

Non-Metallic Elements: Many non-metallic elements, such as carbon (in the form of graphite or diamond), sulfur, phosphorus, and iodine, are insoluble in water.

Metal Oxides: Some metal oxides, particularly those of less reactive metals, are insoluble in water. Examples include aluminum oxide (Al2O3), iron(III) oxide (Fe2O3), and lead(II) oxide (PbO).

Metal Carbonates: Most metal carbonates are insoluble in water. Examples include calcium carbonate (CaCO3), lead(II) carbonate (PbCO3), and copper(II) carbonate (CuCO3).

Metal Sulfides: Many metal sulfides are insoluble in water. Examples include lead(II) sulfide (PbS), silver sulfide (Ag2S), and mercury(II) sulfide (HgS).

Insoluble Salts: Certain salts have limited solubility in water. Examples include silver chloride (AgCl), lead(II) iodide (PbI2), and calcium sulfate (CaSO4).

It's important to note that while these solids are generally insoluble in water, they may exhibit some solubility to a small extent. The solubility of a solid in water can vary depending on factors such as temperature, pressure, and the presence of other solutes.

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Answer: An example is sodium ethoxide (NaOCH2CH3) dissolved in ethanol (CH3CH2OH).

Hope this helps!

No, a molecule with a \(C_2\)axis perpendicular to the \(C_n\)axis does not necessarily have a mirror plane perpendicular to the \(C_n\)axis.

The presence of a \(C_2\)axis perpendicular to the \(C_n\)axis implies that the molecule possesses rotational symmetry around the \(C_n\)axis. However, the presence of a mirror plane is determined by the presence of an additional symmetry element in the molecule.

A mirror plane is a symmetry element that divides the molecule into two halves, with one half being the mirror image of the other. In order for a mirror plane to be present perpendicular to the \(C_n\)axis, there needs to be an additional symmetry element that produces the reflection symmetry.

While a molecule with a \(C_2\) axis perpendicular to the \(C_n\)axis has rotational symmetry, it does not necessarily possess reflection symmetry. For example, consider a molecule with a \(C_2\)axis perpendicular to a \(C_3\)axis.

The rotational symmetry is evident, as the molecule can be rotated by 120 degrees around the \(C_3\) axis and still appear the same. However, this molecule does not possess a mirror plane perpendicular to the \(C_3\)axis.

The presence of a mirror plane perpendicular to the \(C_n\)axis depends on the specific molecular geometry and arrangement of atoms. It is possible for a molecule to possess both rotational symmetry and a mirror plane perpendicular to the \(C_n\)axis, but it is not a general rule.

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Answer:

man my brain like that to

Explanation:

Answer:

man my brain like that to

Explanation:

Answer:

Unlike the speed of your car when running errands, the speed of light is constant throughout the universe and is known to high precision. ... To find the distance of a light-year, you multiply this speed by the number of hours in a year (8,766). The result: One light-year equals 5,878,625,370,000 miles (9.5 trillion km).

Answer:

-Speed of light is the fastest speed ever imaginable. No object having a mass can go faster than light.

Light year is the distance traveled by light, if it moves continuously for 1 whole year, or roughly 365 days.

Explanation:

Answer:

\(T_F=38.7\°C\)

Explanation:

Hello,

In this case, considering that the copper is initially hot and the water is initially cold, we can infer that the heat lost by the copper is gained by the water as follows:

\(\Delta H_{Cu}=-\Delta _{w} H\)

Which can be written in terms of temperatures, masses and heat capacities (390 mL equals 390 g for water).

\(m_{Cu}Cp_{Cu}(T_F-T_{Cu})=-m_{w}Cp_{w}(T_F-T_{w})\)

In such a way, solving for the final temperature we obtain:

\(T_F=\frac{m_{Cu}Cp_{Cu}T_{Cu}+m_{w}Cp_{w}T_{w}}{m_{Cu}Cp_{Cu}+m_{w}Cp_{w}} \\\\T_F=\frac{248g*0.385J/(g\°C)*314\°C+390g*4.18J/(g\°C)*22.6\°C}{248g*0.385J/(g\°C)+390g*4.18J/(g\°C)} \\\\T_F=38.7\°C\)

Regards.

The final temperature will be "38.71°C".

Let,

By applying the formula, we get

→ \(- (Specific \ heat\times Mass\times Temp \ Change) for \ copper = (Specific \ heat\times Mass\times Temp \ Change) for \ water\)

By substituting the values, we get

→ \(-0.385\times 248\times (T-314) =4.184\times 390\times (T-22.6)\)

→               \(-95.48(T-314) = 1631.76(T-22.6)\)

→     \(-95.48 T+314\times 95.48=1631.76-22.6\times 1631.76\)

→                           \(1727.24 T=66858.496\)

→                                       \(T = \frac{66858.496}{1727.24}\)

                                            \(= 38.71^{\circ} C\)

Thus the above answer is correct.

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Based on the information, we can infer that the red line is about 3.9 cm.

To identify the measure of the red line we must look at the metric rule at the bottom. As we can see, this demarcates the centimeters and the millimeters. Based on the information, we can infer that the answer is 3.9 cm since the line extends to the line that delimits this value.

Based on the above, we can infer that the red line measures about 3.9 cm, taking the ruler as a reference.

Note: This question is incomplete. Here is the complete information:

Attached image

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Answer:

3) The amount of matter within the system remains the same

5) The cycle has a well-defined starting and stopping point.

Explanation:

A closed system is a system that the boundaries of a system cannot be passed by either matter or energy.

Hence, generalisations can be made based on a closed system and the law of conservation of mass which states that matter can neither be created nor destroyed but can only change form.

Ozone depletion is the gradual thinning of Earth's ozone layer, which protects us and it is located in the upper atmosphere. The depletion of this atmospheric layer is mostly caused by human activity, by producing manufactured chemicals, one in specific is CFCs, or Chlorofluorocarbons. Letter B

Answer:

Explanafgr7tfgt4ttion:

The total mass of the balloon and its content is 1521.17 g, the number of moles of CO₂ in the balloon is 34.15 mol, and the number of CO₂ molecules in the balloon is 2.06 x 10²⁵ molecules.

a) The molar mass of CO₂ is 44.01 g/mol. To find the total mass of the balloon and its content, we need to add the mass of the balloon (20g) to the mass of the CO₂ inside the balloon.

Mass of CO₂ = number of moles of CO₂ x molar mass of CO₂

Since the balloon is at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to find the number of moles of CO₂ in the balloon:

Volume of CO₂ = Volume of balloon = 765 L (at STP)

Number of moles of CO₂ = volume of CO₂ / molar volume of a gas at STP

                                          = 765 L / 22.4 L/mol

                                          = 34.15 mol

Mass of CO₂ = 34.15 mol x 44.01 g/mol

                       = 1501.17 g

Total mass of balloon and its content = 20 g + 1501.17 g

                                                               = 1521.17 g

b) Number of moles of CO₂ in the balloon is 34.15 mol

c) To find the number of CO₂ molecules in the balloon, we need to use Avogadro's number (6.02 x 10²³ molecules/mol).

Number of CO₂ molecules = number of moles of CO₂ x Avogadro's number

                                           = 34.15 mol x 6.02 x 10²³ molecules/mol

                                           = 2.06 x 10²⁵ molecules

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a. Moles of oxygen reacted = 0.469 moles

b. Moles of iron that must react = 0.625 moles

c. Moles of product formed = 0.313 moles

d. mass of product formed = 50.08 g

a. The moles of oxygen is calculated as follows:

Moles = mass/molar mass

Molar mass of oxygen = 32.0 g/mol

Moles of oxygen = 15/32

Moles of oxygen = 0.469 moles

b. Moles of irons that must react is obtained from the mole ratio of iron and oxygen

Mole ratio of iron to oxygen is 4 : 3

Moles of iron that must react = 4/3 * 0.469

Moles of iron that must react = 0.625 moles

c. Moles of product formed is obtained from the mole ratio of product and oxygen

Moles of product formed = 2/3 * 0.469

Moles of product formed = 0.313 moles

d. mass of product formed = moles * molar mass

Molar mass of product = 160 g/mol

mass of product formed = 160 * 0.313

mass of product formed = 50.08 g

In conclusion, the mass of product formed is determined from the moles of products formed.

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Note that the complete question is as follows:

consider the reaction of 15.0 g of oxygen as follows:

4Fe + 3O2 —> 2Fe2O3

How many moles of oxygen react?

How many moles of iron must react?

How many moles of product form?

What mass of product forms?

Answer:

Explanation:

Energy

Answer:

Basal metabolic rate is the number of calories your body needs to accomplish its most basic (basal) life-sustaining functions.

Answer: A 2.1

Explanation:

Answer:

See attached picture.

Explanation:

Hello,

In this case, on the attached picture you will find the required line structures for the cis and trans configurations of the given compound (2-pentene). Take into account for the cis that the adjacent carbons to those having the double bond remain in the same plane, whereas for the trans one, the adjacent carbons remain in a different plane.

Regards-

The volume of the base that we are going to require in the process would be 28.5 mL

A neutralization reaction is a chemical reaction that occurs when an acid reacts with a base to form a salt and water. It is called a neutralization reaction because the resulting solution is neutral, with a pH of around 7.

We have that;

CAVA/CBVB = NA/NB

CAVANB = CBVBNA

VB = CAVANB/CBNA

VB = 0.132 * 12 * 2/0.111 * 1

VB = 28.5 mL

We are going to use the base that would have a volume of 28.5 mL

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Dropping an antacid tablet in a cup of water is a chemical change while boiling a cup of water for tea is just a physical change.

Physical changes have to do with the physical properties of substances. Such changes can be reversed.

Chemical changes, on the other hand, have to do with the chemical properties of substances and are usually irreversible when they occur.

Dropping an antacid in water with the formation of bubbles indicates that gas is evolved in the reaction. This means that a chemical reaction has occurred.

The bubble formed from boiling water is a result of increased entropy. Evaporated water can be retrieved by condensation.

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The organic product of the following reaction is called benzene which has chemical formula C₆ H₆

The organic compound benzene has the molecular formula C6H6 and is made up of six carbon atoms joined together in a planar ring by one hydrogen atom. Benzene is a hydrocarbon because it only contains carbon and hydrogen atoms.

At room temperature, benzene is a chemical that is either colorless or a light yellow liquid. It is highly flammable and has a pleasant scent. Benzene quickly dissipates into the air. Its vapor can sink into low-lying areas because it is heavier than air.

The organic compound benzene, also known as phenylene, has the molecular formula C6H6. Each of the six carbon atoms in the benzene molecule is attached to a hydrogen atom in a planar ring. Benzene is a hydrocarbon because it only has carbon and hydrogen atoms.

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The reason behind this is that

There are various kind of reaction like combustion reaction, displacement reaction. So to solve this problem we must be knowing the displacement reaction. Displacement reaction is taking place over here

Displacement reaction is a reaction in which one atom replaces other atom from a molecule on the basis of reactivity strength. The element which on the top of reactivity series displace the element that is lying below to that reactive element

According to our question the balanced equation is

FeSO₄+Zn\(\rightarrow\) ZnSO₄+Fe(II)

Fe(NO₃)₂+Zn   \(\rightarrow\)   Zn(NO₃)₂+Fe(II)

In both reaction Zn is more reactive than Fe(II) and Fe(III) that is why Zn replace or displace iron ion from its compound of sulfate and nitrate. Metal displace metals. anions are displaced by anions. So, here metal is displaced by zinc.

Thus we can conclude that zinc is more reactive than iron Fe(II) and Fe(III). Displacement reaction is taking place over here

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Answer:

\({ \sf{Na _{2} SO_{4} \: \: and \: \: HCN}}\)

Sodium sulphate and hydrogen cyanide.

\(Question\)

2NaCN + H2SO4 --> Na2SO4 + HCN

Identify the products in the chemical equation above.

Answer:

→Na2S04 HCN These are the correct Answer! ←

Hope this helps!!!

\(xXxAnimexXx\)

Therefore, the concentration of casein in the milk solution is approximately 1.121 × 10⁻⁵ mol/L.

Concentration is a measure of the amount of a substance present in a given volume or mass of a solution or mixture. It is usually expressed in units of mass per unit volume (e.g. g/L), moles per unit volume (e.g. mol/L), or percentage by mass or volume (e.g. % w/v or % v/v). Concentration is an important concept in chemistry, biochemistry, and many other fields. It allows us to quantify the amount of a substance present in a solution or mixture, and to compare the concentrations of different substances. It is also used to determine the stoichiometry of chemical reactions, to calculate reaction rates, and to monitor the progress of chemical reactions. In general, the concentration of a substance depends on the amount of the substance and the volume or mass of the solution or mixture. Thus, concentration can be changed by adding or removing a substance, or by changing the volume or mass of the solution or mixture.

Here,

First, let's calculate how much casein is in the 1 g of milk powder:

80% of 0.349 g = 0.2792 g of casein

Next, let's calculate the concentration of casein in the milk solution. We'll assume that the milk solution is made by dissolving the 1 g of milk powder in water to make a total volume of 100 mL (or 0.1 L) of solution:

Concentration of casein = mass of casein / volume of solution

Mass of casein = 0.2792 g

Volume of solution = 0.1 L

Concentration of casein = 2.792 g/L or 2.792 mg/mL

Finally, let's calculate the concentration of hydrolyzed casein, which we'll assume is completely broken down into its constituent amino acids. The molecular weight of casein is 24,891 g/mol, so the molecular weight of each amino acid is approximately 110 g/mol (since casein is about 80% amino acids). Therefore, we can estimate that the molecular weight of hydrolyzed casein is about 110 g/mol:

Concentration of hydrolyzed casein = concentration of casein * (molecular weight of casein / molecular weight of hydrolyzed casein)

Concentration of casein = 2.792 mg/mL

Molecular weight of casein = 24,891 g/mol

To calculate the concentration of hydrolyzed casein, we need more information about the degree of hydrolysis of the casein. If we know the percentage of the casein that has been hydrolyzed, we can calculate the concentration of hydrolyzed casein using a similar approach as above.

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The chemical name for the compound CH3CH₂CH₂CH3 is butane.

Alkanes are any acyclic saturated hydrocarbon with a carbon to carbon single bond e.g. methane, ethane etc.

Alkanes have a general molecular formula of CnH2n+2. The number of carbon atoms determines the name of the alkane member.

According to this question, a chemical compound with the molecular formula; CH3CH₂CH₂CH3 is given. This compound posseses 4 carbon atoms and 10 hydrogen atoms, hence, is butane.

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To solve this problem using the gas laws, we need to use the Ideal Gas Law. This law states that the product of the pressure and the volume of a gas is proportional to the absolute temperature.

The equation of the Ideal Gas Law is the following:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{\dfrac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2} } \end{gathered}$} }\)

Where:

We clear for V₂:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{P_1V_1T_2}{P_2T_1 } } \end{gathered}$} }\)

Where:

Substituting the known values:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{760\not{kPa}\times0.050 \ L\times20.0\not{k} }{ 380\not{kPa}\times10.0\not{k} } } \end{gathered}$} }\)

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{760 \ L}{3800 } } \end{gathered}$} }\)

\(\boxed{\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2\approx0.2 \ Liters} \end{gathered}$} }}\)

Answer:

\(\boxed {\boxed {\sf 2.7 \ g/mL}}\)

Explanation:

Density is the mass per unit volume of a substance. It is calculated by dividing the mass by the volume.

\(\rho = \frac{m}{v}\)

The mass of the mineral is 48.6 grams. The volume is 18 milliliters.

Substitute the values into the formula.

\(\rho= \frac{ 48.6 \ g}{18 \ mL}\)

Divide.

\(\rho = 2.7 \ g/ mL\)

The density of the mineral sample is 2.7 grams per milliliter.

The average atomic mass of her sample is 114.54 amu

Let the 1st isotope be A

Let the 2nd isotope be B

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

The average atomic mass of the sample can be obtained as follow:

\(Average \: atomic \: mass \: = \frac{mass \: of \: A \times A\%}{100} + \frac{mass \: of \: B \times B\%}{100} \\ \\ Average \: atomic \: mass \: = \frac{113.6459\times 59.34}{100} + \frac{115.8488\times 40.66}{100} \\ \\ Average \: atomic \: mass \: = 114.54 \: amu \\ \\ \)

Thus, the average atomic mass of the sample is 114.54 amu

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The statement stating addition of an acid to water increases the hydronium ions of the solution and increases the solution pH is false.

The addition of an acid in water leads to its dissociation. They are of two types namely strong and weak acid. The strong acid dissociates completely while weak acid dissociates partially.

Anyways, it leads to release hydrogen of ions which on combination with water molecules forms hydronium ions. As the hydronium ions, the pH of the solution will decrease and acidic character will increase.

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Answer:

Explanation:We known that Earths energy machine is driven by sunlight which acts as fuel for this machine and to strike a balance between outgoing long wave radiation and short wave radiation there are many factors which are involved in this process.Sun emits this energy in the form of short wave radiation because of the huge energy it has and short wave radiation are higher in energy.Hence, they reach the earth surface mostly as visible and UV rays.After reaching the earths surface what happens with these rays is that they get absorbed by the clouds and other constituents of Earth.

Now, this energy needs to be emitted back in to space in order to balance out the energy budget of earth and that is why this energy is emitted back as long wave radiation which have less energy and also earth has less energy unlike the sun.Loss of this energy is essential as Earth looses most of its energy through this and results in cooling.But when this OLR decreases it should be a cause of concern for us.

This imbalance is caused by a wide range of different human induced activities which has a cumulative effect on the temperature of earth.These activities gives rise to a huge gain in the CO2 concentration which is why this word has gain so much popularity and a cause of widespread concern for us.At community level we contribute to this heating by increasing usage of personal automobiles rather than going for public transport , advancement in technology has greatly changed our lifestyles making it more simpler and easier but this demands more energy consumption.Landscape changes are one of the most important because its taking place at a faster rate.Most of the land being cleared off to built new houses which means clearing off the existing vegetation which leads to temperature rise.Setting up of Industry depending on its type can reduce the amount of OLR escaping the surface by introducing more amount of GHGs in to the atmosphere.

Its these small communities which add up to become the entire human population causing a massive damage and hence at community level if people realize and take necessary steps things will start to change.

3 moles of H2 are needed to produce 3 moles of water.

Moles are a unit of measurement that are used to determine how much of a chemical there is. The amount of a material that has the same number of particles (atoms, molecules, ions, etc.) is said to be one mole.

In order to create water (H2O), hydrogen gas (H2) and oxygen gas (O2) must react. The balanced chemical equation for this reaction is:

2H2 + O2 -> 2H2O

The stoichiometry of this reaction states that 2 moles of hydrogen gas and 1 mole of oxygen gas combine to form 2 moles of water. Therefore, we require 3/2 * 2 = 3 moles of hydrogen gas in order to make 3 moles of water.

So, 3 moles of H2 are needed to produce 3 moles of water.

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"Sam is being a good digital citizen by following a code of conduct.

A code of conduct is a set of rules that govern how people should behave online. It is important to follow a code of conduct because it helps to create a safe and respectful environment for everyone.

Here, Sam is following the code of conduct for his gaming group. This code of conduct may include rules about using offensive language, cheating, and griefing. By following these rules, Sam is helping to create a positive experience for everyone in his gaming group.

Therefore, Sam is following the code of conduct.

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