What is the symbol for an atom containing 20 protons and 22 neutrons?

The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction. Option A.

Atoms, mass, and energy are conserved during chemical reactions. Even though their forms may change after reactions.

For a reaction involving vinegar and baking soda, the equation can be expressed as:

vinegar + baking soda ---> carbon dioxide + sodium acetate + water

or

\(CH_3COOH (aq) + NaHCO_3 (aq) --- > CH_3COONa (aq) + H_2O (l) + CO_2 (g)\)

In other words, sodium acetate, water, and carbon dioxide gas are produced in the reaction. Assuming that the reaction vessel is not sealed, the gas would escape away from the vessel.

Since the vessel was sealed, the mass of the plastic bag, baking soda, and vinegar before the reaction will be equal to the sum of the masses of the plastic bag and the products after the reaction.

This will show that the number of atoms present before the reaction is the same as the number of atoms present after the reaction.

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The volume of the water is obtained as 72 mL.

We know that the heat of vaporization is the heat that is required to raise convert the substance from the liquid state to the gaseous state. Now, we know that we can be able to find the energy from the use of the formula;

H = mL

H = heat that is required

m = Number of moles of the object

L = Heat of vaporization

We know from the problem that we have that;

H = 163 kJ

L = 40.66 kJ/mol

Then we would have;

Number of moles = H/L

= 163kJ/40.66 kJ/mol

=  4 moles

Mass of water = 4 moles * 18 g/mol = 72 g

Since the density of water = 1 g/mL

Volume = Density * mass

= 1 g/mL * 72 g

= 72 mL

Thus, the volume of the water that would be vaporized in the process that we have described is about a volume of 72 mL.

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The angles as shown are supplementary angles because the add up to 180 degrees.

Two angles are said to be supplementary if they add up to 180 degrees. Now we know that the sum of angles on  straight line is 180 degrees. If we look at the image as shown in the image attached, we can see that the angles lie on a straight line.

As such, we can conclude that the angles as shown are supplementary angles because the add up to 180 degrees.

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1. Examples of solids, liquids, and gases found in a home

Solids: books, furniture, toys

Liquids: water, juice, shampoo

Gases: air, natural gas, propane

2. The human body contains solids, liquids, and gases. Solids include bones, muscles, and organs. Liquids include blood, saliva, and urine. Gases include air in the lungs and dissolved gases in the bloodstream. The body is mostly made up of liquids, as they make up a large percentage of its overall volume.

3. If you needed to remove the water from a sample of blood to study the solids that remained, you could use a process such as evaporation or freeze-drying. Evaporation involves heating the sample to allow the water to evaporate, leaving behind the solids. Freeze-drying involves freezing the sample and then removing the water under vacuum, leaving behind a dry solid.

4. Some metals that could be found within the human body include iron, zinc, and copper. These metals are commonly found in foods such as meat, seafood, nuts, and whole grains. Other metals such as calcium, magnesium, and potassium are also important for the body and are found in a variety of foods.

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The mass of nitroglycerin : 34.52 g

Reaction

4C₃H₅N₃O₉ ⇒ 12 CO₂ + 10H₂O + 6N₂ +O₂

Volume = 10 L

Temperature = -5°C=268 °K

Pressure = 1 atm

mol of CO₂ (ideal gas) :

\(\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1\times 10}{0.082\times 268}\\\\n=0.455\)

mol ratio C₃H₅N₃O₉ : mol CO₂= 4 : 12, so mol C₃H₅N₃O₉ :

\(\tt \dfrac{4}{12}\times 0.455=0.152\)

mass C₃H₅N₃O₉ (MW=227,0865 g/mol):

\(\tt 0.152\times 227.0865=\boxed{\bold{34.52~g}}\)

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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Answer:

The answer is A ahahahha

Explanation:

Because it just is

Answer:

See Explanation

Explanation:

Metallic bonds involve attraction between electrons and positively charged metal ions. The metals are ionized and electrons form a sea of valence electrons. These loosely bound electrons surround the nuclei of the metals.

The presence of this sea of electrons explains the fact that metals conduct electricity and heat due to the free valence electrons.

Due to the nature of the bonding between metal atoms,metals are malleable and ductile.

Due to the strong electrostatic interaction between metal ions and electrons, the metallic bond is very strong and is very difficult to break thereby accounting for the greater strength of metals as the size of the metallic ion decreases.

According to the law of reciprocal proportions, they should combine in the ratio of 10.24:7.92:1.29 by mass.

According to the law of reciprocal proportions when two elements join to form more than one compound, the weights of one element that combine with a fixed weight of the another are in a ratio of small whole numbers.

In phosphine, phosphorus = 91.1 parts and hydrogen = 8.9 parts

So, 8.9 pads of hydrogen combine with phosphorus = 91.1 parts .

1 part of hydrogen combine =  91.1 / 8.9

= 10.24 parts

Similarly,

for water 88.8 / 11.2

= 7.92 parts of hydrogen

For Phosphorus tetra oxide

= 56.4 / 43.6

= 1.29 parts

Thus, According to the law of reciprocal proportions, they should combine in the ratio of 10.24:7.92:1.29 by mass.

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Answer:

B. Velocity has direction, and speed does not.

Explanation:

Velocity is a vector, meaning it has both a magnitude and direction. Speed is a scalar, meaning it only has a magnitude and no direction.

Answer:it conduct thermal conductivity because of the heat it holds

Explanation:

When energy is transformed from one form to another, the appliance could be redesigned in such a way that this transfer is minimized.

We know from the principle of transfer of energy that energy can neither be created nor destroyed but is transformed from one form to another. The image is not shown here but I will try to explain what energy transfer is.

Usually, when energy is transformed from one form to another, the appliance could be redesigned in such a way that this transfer is minimized.

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Answer:

If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the current in circuit B

Explanation:

To know the the correct answer to the question, do the following:

Case 1: Let the circuit A and B have equal voltage say 24 V.

For Circuit A:

Voltage (V) = 24 V

Resistance (R) = 7.5 ohms

Current (I) =?

V = IR

24 = I × 7.5

Divide both side by 7.5

I = 24 / 7.5

I = 3.2 A

For Circuit B:

Voltage (V) = 24 V

Resistance (R) = 5 ohms

Current (I) =?

V = IR

24 = I × 5

Divide both side by 5

I = 24 / 5

I = 4.8 A

Thus for the same voltage, current in circuit A is less than the current in B.

Case 2: Let circuit A and B have equal current say 2 A

For circuit A:

Current (I) = 2 A

Resistance (R) = 7.5 ohms

Voltage (V) =?

V = IR

V = 2 × 7.5

V = 15 V

For Circuit B:

Current (I) = 2 A

Resistance (R) = 5 ohms

Voltage (V) =?

V = IR

V = 2 × 5

V = 10 V

Thus, for the same current, the voltage in circuit A is greater than the voltage in B

Case 3: Let circuit A have a current of 4 A and circuit B have a current of 5 A

For circuit A:

Current (I) = 4 A

Resistance (R) = 7.5 ohms

Voltage (V) =?

V = IR

V = 4 × 7.5

V = 30 V

For circuit B:

Current (I) = 5 A

Resistance (R) = 5 ohms

Voltage (V) =?

V = IR

V = 5 × 5

V = 25 V

Thus, when the current in circuit A is less than the current in circuit B, the voltage in circuit A is greater than the voltage in circuit B.

From the illustrations above and the options given in the question, the current answer is:

If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the current in circuit B

Answer: 2.78

Explanation:

 To calculate the pH of 0.16M CH3COOH, we need to use the dissociation constant (Ka) of the acid, which is given as 1.74 × 10^-5 mol dm^-3.

The dissociation of CH3COOH is as follows:

CH3COOH + H2O ↔ CH3COO- + H3O+

The equilibrium constant expression for the dissociation of CH3COOH is:

Ka = [CH3COO-][H3O+] / [CH3COOH]

We can assume that [H3O+] is equal to [CH3COO-] since the acid is weak and will not dissociate completely. Therefore, the equilibrium constant expression can be simplified as:

Ka = [H3O+]^2 / [CH3COOH]

[H3O+]^2 = Ka x [CH3COOH]

[H3O+]^2 = 1.74 × 10^-5 x 0.16

[H3O+]^2 = 2.784 × 10^-6

[H3O+] = √2.784 × 10^-6

[H3O+] = 0.00167 M

Therefore, the pH of the solution can be calculated as:

pH = -log[H3O+]

pH = -log(0.00167)

pH = 2.78

Therefore, the pH of the 0.16M CH3COOH solution is 2.78.

Evaporation causes the dew to vanish when the temperature of the atmosphere rises with the rising of the sun.

A kind of vaporization called evaporation takes place on the surface of a liquid as it transitions into the gas phase. When humidity impacts the rate of evaporation of water, for example, a high concentration of the evaporating material in the surrounding gas considerably slows down evaporation.

Similar to how perspiration evaporates from your body on a hot day to cool you down, dew evaporates as it cools the plant. This lessens heat exhaustion in extremely hot settings. Some species, particularly desert plants, are capable of directly absorbing water via their leaves.

Thus, Evaporation causes the dew to vanish when the temperature of the atmosphere rises with the rising of the sun.

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Based on the given reactions, the compounds are as follows:

A: The specific product formed from the reaction between prop-1-yne and either 2HBr or H2O2.

B: The product formed when compound A reacts with 2H2O.

C: The product formed when compound B reacts with K2CO3(aq).

D: The product formed from the heat-induced reaction of compound C.

E: The product formed when compound D reacts with HBr.

Based on the given reactions, let's analyze the compounds involved:

Reaction 1: prop-1-yne + 2HBr/H2O2 = A

The reactant prop-1-yne reacts with either 2HBr or H2O2 to form compound A. The specific product formed will depend on the reaction conditions.

Reaction 2: A + 2H2O = B

Compound A reacts with 2H2O (water) to form compound B.

Reaction 3: B + K2CO3(aq) = C

Compound B reacts with K2CO3(aq) (potassium carbonate dissolved in water) to form compound C.

Reaction 4: C + heat = D

Compound C undergoes a heat-induced reaction to form compound D.

Reaction 5: D + HBr = E

Compound D reacts with HBr (hydrobromic acid) to form compound E.

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The percent composition of CuBr₂ is approximately 28.46% of Cu and 71.54% of Br.

To determine the percent composition of CuBr₂ (copper(II) bromide), we need to calculate the mass of each element in the compound and then divide it by the molar mass of the entire compound.

The molar mass of CuBr₂ can be calculated by adding up the atomic masses of copper (Cu) and bromine (Br) in the compound. The atomic masses of Cu and Br are approximately 63.55 g/mol and 79.90 g/mol, respectively.

Molar mass of CuBr₂ = (63.55 g/mol) + 2(79.90 g/mol) = 223.35 g/mol

Now, let's calculate the percent composition of each element in CuBr₂:

Percent composition of copper (Cu):

Mass of Cu = (63.55 g/mol) / 223.35 g/mol × 100% ≈ 28.46%

Percent composition of bromine (Br):

Mass of Br = 2(79.90 g/mol) / 223.35 g/mol × 100% ≈ 71.54%

Therefore, the percent composition of CuBr₂ is approximately:

- Copper (Cu): 28.46%

- Bromine (Br): 71.54%

These values represent the relative mass percentages of copper and bromine in the compound CuBr₂.

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Answer:

a

Explanation:

Because they have a limited of thing so they have to reuse resources

Because people have unlimited wants and limited resources, they must recycle and reuse resources. The correct options are a.

Resources are things that can be used by an individual or organization to carry out plans and projects. Resources can be natural things and artificial things, like money, raw material, and vehicles. Resources help people to run their life with all peace and ease.

Recycling is the process of gathering and converting resources into new goods that would otherwise be thrown away as waste. Your community and the environment may both benefit from recycling.

The resources are limited on earth and human consumption is increasing day by day. So to proper use of resources, we must reuse and recycle the resources.

Thus, the correct options are a. recycle and reuse resources.

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a. CO₃²⁻ + H₃O⁺ -> HCO₃⁻ + H₂O (CO₃²⁻ is the base, H₃O⁺ is the acid, HCO3- is the conjugate acid, and H₂O is the conjugate base)

b. The acid is the species that donates a proton, while the base is the species that accepts a proton.

The reaction between CO₃²⁻ and excess H₃O⁺ in seawater can be represented as:

CO₃²⁻ + H₃O⁺ -> HCO₃⁻ + H₂O

Conjugate acid-base pairs:

CO₃²⁻ / HCO₃⁻ and H₃O⁺ / H₂O

In the reaction, the species that donates a proton (H⁺) is the acid, and the species that accepts a proton is the base. In the given reaction, H₃O⁺ donates a proton to CO₃²⁻, making it the acid, while CO₃²⁻ accepts the proton to become HCO₃⁻, making it the base.

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Answer: 67.5

Explanation:

Brainliest pls

Answer:

join the provisonal IRA and help free and unite ireland

Explanation:

fight aganst the english oppressors and free ireland

erinn go braugh

Answer:

3 atm

1.6 g

Explanation:

Step 1: Given data

Step 2: Find partial pressure (P) of CO₂ gas

We will use Henry's law.

C = k × P

P = C / k

P = 0.1 M / 3.3 × 10⁻² M atm⁻¹

P = 3 atm

Step 3: Calculate the mass of CO₂ gas

The molar mass of carbon dioxide is 44.01 g/mol.

0.355 L × 0.1 mol/L × 44.01 g/mol = 1.6 g

The combined gas law equation is:

(P1 * V1) / (T1) = (P2 * V2) / (T2)

The volume of the gas at 30 °C is approximately 760.67 mL.

To determine the volume of the gas at 30 °C, we can use the combined gas law equation, which relates the initial and final conditions of temperature and volume for a gas.

The combined gas law equation is:

(P1 * V1) / (T1) = (P2 * V2) / (T2)

Where:

P1 and P2 are the initial and final pressures, respectively

V1 and V2 are the initial and final volumes, respectively

T1 and T2 are the initial and final temperatures in Kelvin, respectively

We need to convert the temperatures from Celsius to Kelvin by adding 273.15 to each value.

Given:

V1 = 550 mL

T1 = -55 °C = 218.15 K

T2 = 30 °C = 303.15 K

Assuming the pressure remains constant, we can rearrange the equation to solve for V2:

V2 = (P1 * V1 * T2) / (P2 * T1)

Since the pressure is not specified in the problem, we can assume it remains constant, allowing us to cancel out the pressure terms. Thus, the final equation becomes:

V2 = (V1 * T2) / T1

Plugging in the given values:

V2 = (550 mL * 303.15 K) / 218.15 K

Simplifying the calculation, we find:

V2 ≈ 760.67 mL

Therefore, the volume of the gas at 30 °C is approximately 760.67 mL.

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Answer:

A

Explanation:

Nuclear fusion is a much more powerful reaction than any of the others.

Nuclear fusion of two hydrogen isotopes would expect to produce the most energy. Therefore, option (A) is correct.

Nuclear fusion can be defined as when two or more nuclei fuse together to form a single heavier nucleus. In this reaction, the matter is generally not conserved due to some of the mass of the nuclei being converted to energy.

For nuclear fusion, the nuclei must be brought closer to the reaction occurring. Each star in the universe, including sun, is shining due to nuclear fusion reactions. They produce large amounts of energy in this process.

In the Sun's core, hydrogen nuclei are get transformed into helium nuclei which are known as nuclear fusion. It takes place when four hydrogen nuclei fuse into each helium nucleus. During the Nuclear fusion process, some of the mass of hydrogen nuclei is transformed into energy.

Therefore, nuclear fusion is where hydrogen atoms combined to form helium to produce the most energy.

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Tthe initial temperature of the polystyrene sample is 39.4°C.

Given: Mass of polystyrene sample = 54.2 gSpecific heat of polystyrene = 1.880 J-g°CWater mass = 100.0 g Initial water temperature = 21.0°CWater final temperature = 34.3°CPressure remains constant at 1 atmFormula used:Heat gained by water = heat lost by polystyreneHence,Heat lost by polystyrene = Heat gained by water=> mcΔT = mcΔTwhere,m = mass of polystyrene or waterc = specific heat capacityΔT = change in temperatureThe temperature change is ΔT = 34.3°C - 21.0°C = 13.3°CNow we can use this temperature change to calculate the initial temperature of the polystyrene.Taking the water's specific heat capacity, c = 4.184 J/g°CHeat gained by water = (100.0 g)(4.184 J/g°C)(13.3°C) = 5574 JHeat lost by polystyrene = 5574 JTaking the polystyrene's specific heat capacity, c = 1.880 J/g° ) = 13.3°C Now let's calculate the mass of polystyrene using the specific heat capacity formula.5574 J = (54.2 g)(1.880 J/g°C)(13.3°C - Ti)Ti = 39.4°C

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The mechanism of  the reaction of an alkene with an electrophile attached below

There's 2 steps in reaction between alkene and electrophile

The K in the KI electrophile is attacked by the two pi electrons from the double bond during the first step of the process, which is denoted by a curved arrow. The hydrogen from HBr and a carbon from the double bond combine to produce a C-H sigma bond thanks to the two pi electrons. In order to create a halide anion, the electrons from the H-X bond simultaneously transfer to the halogen. One of the carbons becomes an intermediate carbocation with an electron deficit when pi electrons from the double bond are removed. The positive charge is housed in an unhybridized p orbital on this sp2 hybridized carbon atom.

In order to receive an electron pair from the nucleophilic halide anion, the generated carbocation can now function as an electrophile. The neutral alkyl halide is the end result of electrophilic addition, and the electron pair transforms into an X-C sigma bond.

The HBr, HCl, HI, and HF halides can all take part in this reaction and add on in the same way. Although various halides do react at varying rates, this is because the H-X bond weakens with increasing X due to inadequate orbital overlap.

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ANSWER

Oxygen

EXPLANATION

Magma is the molten or semi-molten natural materials from which all igneous rock is formed

Magma is composed of a mixture of molten materials with varying amounts of dissolved gases and small amount of solid materials.

Magma contains 46.6% of oxygen which is more than half of the total dissolved gases

Therefore, the most abundant element in magma is oxygen

Answer:

molecules are the groups of atom bonding together , representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction