Which of the following reactions best represents the reaction between H3PO4
and water?
A) H3PO4 + H2O ⇌ H2PO4
- + H2O
B) H3PO4 + H2O ⇌ H2PO4
- + H3O+
C) H3PO4 + 3 H2O → PO4 3- + 3 H2O
D) H3PO4 + 3 H2O → PO4 3- + 3 H3O+

Answer:

Celcius

Farenheit

Kelvin

Explanation:

Answer: 1.4666667e+14

Explanation:

The mass of gasoline in the full tank is 68.99 kilograms. Gasoline is a highly flammable and volatile liquid that can easily ignite if exposed to heat or a spark.

What is Gasoline?

Gasoline, also known as petrol, is a transparent, petroleum-derived liquid that is primarily used as a fuel in internal combustion engines. It is a mixture of hydrocarbons, typically containing 5 to 12 carbon atoms per molecule. Gasoline is refined from crude oil through a process of distillation, whereby the crude oil is heated and separated into its different components based on their boiling points.

First, we need to convert the volume of gasoline from gallons to milliliters:

1 gallon = 3.78541 liters

1 liter = 1000 milliliters

Therefore:

22.3 gallons x 3.78541 liters/gallon x 1000 milliliters/liter = 84,161.83 milliliters

Next, we can use the density of gasoline to find the mass of the gasoline:

0.8206 g/mL x 84,161.83 mL = 68,986.87 grams

68,986.87 grams / 1000 grams per kilogram = 68.99 kilograms (rounded to two decimal places)

Therefore, the mass of gasoline in the full tank is 68.99 kilograms.

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Answer : 69.3 kg

Explanation:

Answer:

its sodium hydroxide

Explanation:

Answer:

Decreased

Explanation:

As the concentration of salt in the external solution increased, the water potential of the external solution lowers.

The water potential of the cytoplasm inside potato cells becomes higher than that of the external solution.

There is a net movement of water molecules from the cytoplasms of potato cells to the external solution by osmosis, (because in osmosis, water molecules tend to move from a region of higher water potential to a region of lower water potential through a semi-permeable membrane- which is the potato cell membrane in this case)

As the potato cells lose so much water, the cells shrink hence the average length of potato cylinders decrease.

To solve this, we must know each and every concept behind osmosis processes. Therefore,  the average length of potato cylinders decreases.

In osmosis, water molecules typically pass across a semi-permeable membrane from a location of greater water potential to a region with lower water potential.

The water potential of the external medium decreases as the salt content in the external solution rises. In potato cells, the cytoplasm's water potential rises above that of the surrounding fluid. Osmosis causes a net transfer of water molecules from the potato cells' cytoplasm to the external solution. The average length of potato cylinders decreases as a result of the potato cells shrinking after losing so much water.

Therefore,  the average length of potato cylinders decreases.

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Answer:

66.8mL

using dimensional analysis:

\(\frac{144 grams}{} *\frac{1 mL}{8.56 grams} = 16.8mL\)

16.8mL+50.0mL=66.8mL final reading

Density is in units mass/volume, you were given the mass and density so from that you can find the volume of the metal and add that to the initial volume of water.

I used dimensional analysis which can be used to solve essentially any problem involving units. Notice how I started with the given number and units on the left and multiplied it by a fraction the units of the given number on the bottom (so it will cancel) and the desired unit on the top.

Answer:

2.282 atm

P1V1/T1 = P2V2/T2

2.70atm / (50+273) = X/ 273

make x subject of formula

:. X = 2.28 atm

or 2.28 * 1.01 *10⁵ N/m²

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The removal of hydrogen or any other electropositive element, or the addition of oxygen, is said to be the process of oxidation in classical or earlier concepts. An atom or ion gains one or more electrons during the process of reduction.

1. The oxidation half-reaction of copper is:

Cu  → Cu²⁺ + 2e⁻

The reduction half is:

Cu²⁺ + 2e⁻ → Cu

3. An anode in electrochemistry is, in its simplest form, the site of an oxidation reaction. Due to the anode's electrical potential, negative ions or anions usually react there and release electrons. After that, these electrons ascend and enter the drive circuit.

In chemistry, the cathode is referred to as the electrode where reduction takes place. In an electrochemical cell, this is typical. Here, the cathode is negative because the cell's electrical energy supply causes chemical molecules to break down.

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Answer:

The symbol (l) stands for liquid phase.

Explanation:

Answer:

Chemical Energy is stored in food molecules

Answer:

chemical energy

Explanation:

because none of the other make sense

Answer:

yes

Explanation:

yes

The three main causes of erosion, or the removal of soil, rock, and other materials, are wind, water, and ice.

Compared to plate tectonics, landforms are changed much more quickly by earthquakes, weathering, and people, and these changes are frequently visible.

Sand dunes, Loess Deposits, Yardangs, Ventifact, Deflation Hollow or Blowout, and Desert Pavement are among the geological features.

Glaciers carved a collection of strange valleys with flat bottoms and steep walls. Hanging valleys, fjords, and U-shaped valleys are a few examples of the different sorts of valleys that glaciers can destroy.

Alpine glaciers have their origins in the mountains, in a number of our National Parks. When they form in tiny basins with sloping sides, they are referred to as cirque glaciers (cirques).

U-shaped valleys have been found to be produced by glacial erosion. A massive glacier's journey through the landscape leaves imposing traces. Walls of rock blocks are  torn apart by its abrasive force.

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When fossil fuels burn, several forms of energy are produced, including:

Heat energy: The primary form of energy released during fossil fuel combustion is heat. Fossil fuels contain chemical energy stored for millions of years, and when they burn, this energy is released in the form of heat. The heat energy can be harnessed for various purposes, such as heating buildings or generating steam to drive turbines.

Light energy: Burning fossil fuels can also produce light energy in the form of flames or glowing embers. This light energy is a byproduct of combustion.

Mechanical energy: Heat generated by burning fossil fuels can be converted into mechanical energy. This is typically achieved by using heat to produce steam, which drives a turbine connected to a generator. The rotating turbine converts the heat energy into mechanical energy, which is further transformed into electrical energy.

Electrical energy: Through the process described above, burning fossil fuels can ultimately generate electrical energy. The mechanical energy produced by the turbine is converted into electrical energy by the generator. Electrical energy can power various devices, appliances, industries, and infrastructure.

It's critical to note that while burning fossil fuels can produce useful forms of energy, it also results in the release of carbon dioxide and other greenhouse gases. This contributes to climate change and environmental concerns. As a result, there is a global shift towards cleaner and renewable energy sources to mitigate these negative impacts.

Earth's rotation, gravity, and mantle dynamics play greater role in reshaping the land of continents and Islands.

Earth's rotation, gravity, and mantle dynamics are the forces that play a significant role in influencing the size, shape, and positioning of the different landmasses of our continents and islands. These forces are responsible for the change in shape of land masses with the passage of time.

So we can conclude that Earth's rotation, gravity, and mantle dynamics play greater role in reshaping the land of continents and Islands.

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Describes the movement of the plates across the Earth's lithosphere?

The volume of acid we will require in this situation is 27000 mL.

We are aware that understanding the reaction equation is necessary because it is the first step in resolving the issue at hand;

Having said that,

CaCO3 + 2HCl → CaCl2 + H2O + CO2

Acid molarity = antilog (-1.55).

The number of base moles;

38 g/100 g/mol

= 0.38 moles

If 2 moles of acid and 1 mole of base combine;

The base responds with 0.38 * 2/1 moles.

= 0.76 moles

Volume = n/M

= 0.76/ 0.028

= 27 L or 27000 mL

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Answer:

26.2 atm

Explanation:

P1=P2V2/V1

P1=(1.05 x .980)/.0393

Answer: 26.2 atm

You can check this by knowing that P and V at constant T have an inverse relationship. Hence, this is correct.

The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart. Option A)

The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart.

In gases, the molecules are widely spaced and have significant gaps between them. This allows gases to be easily compressed under pressure. When external pressure is applied to a gas, the molecules can be brought closer together, reducing the volume occupied by the gas. The gaps between the molecules provide room for compression, allowing gases to occupy a smaller volume.

In contrast, liquids and solids have molecules or particles that are closely packed together. The intermolecular forces in liquids and solids are stronger, limiting their compressibility. The molecules or particles are already in close proximity, leaving little room for further compression.

Therefore, the assumption that gases consist of molecules that are relatively far apart accounts for their greater compressibility compared to liquids and solids. Hence Option A) is correct.

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Answer: The percentage error is 16.6 %.

Explanation:

To calculate the percentage error, we use the equation:

\(\%\text{ error}=\frac{|\text{Experimental value - Accepted value}|}{\text{Accepted value}}\times 100\)

We are given:

Experimental value of ΔH = -43.1 kJ/mol

Accepted value of ΔH = -51.669 kJ/mol

Putting values in above equation, we get:

\(\%\text{ error}=\frac{|(-43.1)-(-51.669)|}{(51.669)}\times 100\\\\\%\text{ error}=16.6\%\)

Hence, the percentage error is 16.6 %.

Answer:

c

Explanation:

The volume of 12 gas forms when 21 L Cl2 react at STP is 21 L.

To determine the volume of 12 gas (I assume you mean I2 gas) formed when 21 L of Cl2 reacts at STP (standard temperature and pressure), we need to use the ideal gas law equation.

The ideal gas law equation is given by:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

At STP, the pressure is 1 atm, and the temperature is 273.15 K.

From the balanced equation, we can see that the molar ratio between Cl2 and I2 is 1:1. So, if 21 L of Cl2 reacts, it will produce an equal volume of I2 gas.

Given that the volume of Cl2 is 21 L, we can assume the volume of I2 gas formed will also be 21 L.

Therefore, the volume of I2 gas formed is 21 L.

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Answer:

C, Movement

Explanation:

An aldol condensation is a condensation organic reaction whereby an enol or an enolate ion reacts with a carbonyl compound (from a ketone or aldehyde) to form a β-hydroxyaldehyde or β-hydroxyketone or more specifically an aldol reaction.

The reason why you can observe starting material and product in the tlc analysis is that the product ( which you obtained from a hydrogenation reaction) should be less polar than the source from which reaction starts.

TLC is a simple, quick, and inexpensive procedure that gives the chemist a quick answer as to how many components are in a reaction.

TLC is also used to support the identity of a compound in a mixture when the Rf of a compound is compared with the Rf of a known compound.

TLC or Thin Layer Chromatography is the type of analysis in which a small amount of the mixture to be analysed is spotted near the bottom of this plate.

This suggests that in aldol reactions, the starting material were analysed in TLC and during this analysis that material was completely consumed.

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It has a metallic sheen that denotes the presence of lead sulphide and gold (Au). However the fact that it is unaffected by a hammer shows that quartz may also be present.

As sample W is an excellent electrical conductor and does not melt when heated with a Bunsen burner, the presented findings of the research indicate that it is gold (Au). When Sample X breaks into several pieces when struck with a hammer and dissolves in 6 MHNO3, it is lead sulphide (PbS). Since Sample Z is unaffected by hammer blows and does not melt when heated with a Bunsen burner, yet does not dissolve in 6 MHNO3, it is a combination of gold (Au), lead sulphide (PbS), and quartz (SiO2). It also exhibits a metallic shine, which denotes the presence of lead sulphide and gold. Nonetheless, the fact that a hammer has no effect on it shows that quartz may also be present.

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The final temperature of the calorimeter after the reaction is 230.0°C.  To calculate the final temperature of the calorimeter after the reaction, we need to use the equation:

q = m x c x ΔT

where q is the heat gained or lost by the system, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

In this case, the system is the calorimeter and the reaction involves the iron metal. The heat gained by the system is equal to the heat lost by the iron metal, so we can set q_calorimeter = -q_iron.

We are given that the mass of the iron metal is 2.000 g and the specific heat capacity of the calorimeter is 350.0. We need to determine the change in temperature, ΔT.

To do this, we need to know the heat released by the iron metal, which can be calculated using the equation:

q_iron = m x c x ΔT

where m is the mass of the iron metal and c is its specific heat capacity. The specific heat capacity of iron is 0.449 J/g°C.

Substituting the values given, we have:

q_iron = 2.000 g * 0.449 J/g°C x ΔT

q_iron = 0.898 J/°C x ΔT

Since q_calorimeter = -q_iron, we have:

q_calorimeter = -0.898 J/°C * ΔT

We know that the initial temperature of the calorimeter was 23.0°C, so we can set:

q_calorimeter = m_calorimeter x c_calorimeter x ΔT

where m_calorimeter is the mass of the calorimeter and c_calorimeter is its specific heat capacity.

Substituting the given values, we have:

-0.898 J/°C * ΔT = m_calorimeter x 350.0 J/kg°C x (T- 23.0°C)

where T is the final temperature of the calorimeter.

We can simplify this equation by converting the mass of the calorimeter from grams to kilograms:

-0.898 J/°C * ΔT = m_calorimeter * 0.350 J/g°C * (T- 23.0°C)

-0.898 J/°C * ΔT = 0.001 m_calorimeter * (T - 23.0°C)

Solving for ΔT, we get:

ΔT = (0.001 m_calorimeter * (T - 23.0°C)) / -0.898 J/°C

ΔT = -1.114 m_calorimeter * (T - 23.0°C)

ΔT = -1.114 Tx m_calorimeter + 25.642 m_calorimeter

To solve for T, we need to know the mass of the calorimeter. Let's assume it is 100 g. Substituting this value, we get:

ΔT = -1.114 Tx 0.100 kg + 2.5642 kg°C

ΔT = -0.1114 T + 25.642

Setting ΔT to zero (since the final temperature will be when the system is at equilibrium), we can solve for T:

0 = -0.1114 T + 25.642

T = 230.0°C

Therefore, the final temperature of the calorimeter after the reaction is 230.0°C.

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It is  measuring out to be 970 ml instead of 1,000 ml because while mixing there is probability that missing 30 ml of mixture is evaporated as it has isopropyl alcohol which has high volatility according to forces of attraction.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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The sections between the lines on a phase diagram represent Option B. The regions in which temperature and pressure change a substance's phase .

A phase diagram is a graphical representation that shows the conditions at which a substance exists as a solid, liquid, or gas.

It is a graph that represents the relationship between pressure and temperature under which a substance exists as a solid, liquid, or gas.

The sections between the lines on a phase diagram represent the regions in which temperature and pressure change a substance's phase.

Answer: B. The regions in which temperature and pressure change a substance's phase.

Explanation:A phase diagram is a graphical representation of the state of matter that exists under certain conditions of pressure and temperature.

A phase diagram is also known as a phase equilibrium diagram, a phase transition diagram, or a P-T diagram (pressure-temperature).

A phase diagram has three regions, solid, liquid, and gas, which are separated by phase boundaries.

Each boundary represents the conditions of temperature and pressure under which a phase change occurs.

The triple point is the point where all three phases coexist.

The critical point is the point at which the gas and liquid phases become indistinguishable.

The sections between the lines on a phase diagram represent the regions in which temperature and pressure change a substance's phase.

These sections are also called phase boundaries or phase transitions.

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There is a nine-fold rise in the pace of the reaction when the concentration of F is tripled but the concentration of G stays the same. The response is in the second order relative to F.

If you increase one reactant's concentration in a third order reaction involving two reactants by three times, the rate rises by a factor of three. If a reactant is first order, its concentration will cause a doubling in the reaction's rate; a tripling in the reaction's rate, etc. If a reactant is third order, its rate of reaction will increase by a factor of 8 when its concentration is doubled (23 = 8), etc.

The concentration of a reactant does not impact the rate. The rate remains unchanged even if the concentration is doubled. The given rate law needs to be written first. The concentrations of A and B will be increased by three times each after that.

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The Two Aspects of Science: Control over nature and understanding of nature must both be held in equal honor.