Does changing the number of neutrons affect the atomic number?

Answer:10

Explanation:

Multiply the volume by the density to get the mass.

Divide the mass by the molar mass to get the number of moles.

Compound, according to our last session.

Answer:

true

Explanation:

Answer:

its true

Explanation:

you know Aspirin is one of the Aesthetic Values of biodiversity is true

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#1

K^2+

How?

Let's look at electronic configuration

\(\\ \sf\longmapsto 1s^2s^22p^63s^23p^64s^1\)

New EC will be

\(\\ \sf\longmapsto 1s^22s^22p^63s^23p^5=[Ar]^-\)

Hence its not stable .

#2

Anion means minus charge

Hence our answer is O^2-

Answer:

2

Explanation:

10/5

Standard temperature and pressure are the conditions that are considered standard when compared to experimental measurement. At STP, 6680 mL of oxygen will have 0.3 moles.

STP is the abbreviated form standard temperature and pressure that is a definitive condition of the reaction system that is used for the comparative analysis.

Given,

Volume of oxygen = 6680 mL = 6.680 L

At STP,

1 mol = 22.4 L

Substituting values to calculate the moles as

1 mol = 22.4 L

X mol = 6.680 L

Solving for X:

X = 6.680 L × 1 mol ÷ 22.4 L

= 0.298 moles

Therefore, 6680 mL of oxygen sample contains 0.3 moles of oxygen.

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Answer:

B

Explanation:

Isotopes have the same number of protons but different number of neutrons.

The true statement is,

So, option C is correct one.

The isotopes have different physical properties like freezing point , mass, melting or boiling point etc because they have different mass number .

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Answer:

True

Explanation:

There is such thing called tectonic plated

Answer:

True

Explanation:

The crust is made of plates called tectonic plates that move as fast as your finger nails grow, the amount of movement can create both tall and deep earth wonders. Such as the Mariana Trench and Mount Everest. And it causes earthquakes when they slide together.

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Electrons are said to be delocalized electrons

Delocalized electrons are electrons in a molecule, ion, or solid metal that are not associated with a single atom or covalent connection. Electrons that have been delocalized are trapped within an orbital that spans many neighboring atoms.

Because electrons can freely roam within these molecular orbitals, each electron becomes separated from its parent atom. Delocalization refers to electrons. The strong forces of attraction between the positive nuclei and the delocalized electrons hold the metal together.

As a result, in a metallic link, electrons are free to flow freely from one atom to the next across the metal and are not bound to a specific atom; these electrons are referred to as delocalized electrons.

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That oil sands executive is greedy and heartless and therefore can't be trusted when she claims is Ad hominem attack. So, Option B is correct.

4-  The argument in question 4 is an example of an ad hominem attack. This is due to the argument's focus on the character of the oil sands executuive rather than the actual problem, which is how to improve the company's environmental record.

The argument holds that the executive cannot be believed when she says she wants to improve the company's environmental record because she is avaricious and callous. This is an error in logic, though, as the executive's character may not necessarily be related to the company's environmental policies.

5-  The argument in question 5 is an example of an appeal to ignorance. This is because the argument states that there is no proof that humans are causing climate change, so it must be natural causes. Just because there is no conclusive proof that humans are causing climate change, it does not mean that they are not.

The argument assumes that just because there is no evidence to the contrary, the argument must be true. This is a logical fallacy.

So, Option B is correct.

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The correct option is (C). The approximate final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M is 86 mL (option C).

To find the final volume of the solution, we can use the formula:

C1V1 = C2V2

Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Plugging in the values we know, we get:

(8.25 M) (25 mL) = (2.40 M) (V2)

Solving for V2, we get:

V2 = (8.25 M x 25 mL) / 2.40 M
V2 = 86.25 mL

Therefore, the approximate final volume of the solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M is 86 mL (option C).

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A tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.

The liquid and water vapor establish equilibrium in a tightly sealed container but not in the drinking glass because in the tightly sealed jar, the water can't go into the atmosphere but in the drinking glass the water will evaporate.

So we can conclude that a tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.

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A single replacement reaction is a type of chemical reaction that takes place when one element in a compound is replaced by another element. In other words, in this reaction, one element is replaced by another element. There are a few ways to predict whether or not a single replacement reaction will occur.

These ways are explained below: Paying Attention to ReactantsThe first way to predict if a single replacement reaction will occur is by paying attention to the reactants. In a single replacement reaction, a more reactive element will replace a less reactive element. For example, if a metal element is mixed with an aqueous solution that contains ions of another metal, a single replacement reaction will occur if the metal in the solid state is more reactive than the metal in the solution state. For instance, if you put zinc in copper sulfate, a reaction will occur because zinc is more reactive than copper. Therefore, it will replace copper, producing zinc sulfate and copper.Using the Activity SeriesAnother way to predict if a single replacement reaction will occur is by using the activity series. The activity series is a list of metals and their ability to replace other metals from their compounds. This list is arranged in order of decreasing activity. Therefore, if a metal is more active than another metal on the activity series, it will replace that metal from its compound. For example, if you put magnesium in silver nitrate, a reaction will occur because magnesium is more reactive than silver. Therefore, magnesium will replace the silver, producing magnesium nitrate and silver. If the metal is less active than another metal on the activity series, no reaction will occur.Using Electrochemical SeriesThe electrochemical series is another way to predict if a single replacement reaction will occur. The electrochemical series lists the elements in order of their standard reduction potentials. A metal with a higher reduction potential will replace a metal with a lower reduction potential from its compound. For instance, if you put copper in magnesium sulfate, no reaction will occur because copper has a lower reduction potential than magnesium. Therefore, magnesium will not replace copper from its compound.

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all of the elements, except for hydrogen and helium, originated from the life and death of a star.

In essence, stars are enormous explosions of gas, primarily hydrogen and helium.Since the Sun is the closest star to us, it is always experiencing a nuclear reaction similar to that of a hydrogen bomb due to the immense amount of hydrogen present.

unlike the moon, stars do not contain solid matter.The star, which is the creation of heated gases, energy, light, and heat, does not allude to the characteristics of the moon.The moon isn't a star or a planet, therefore.The moon is not a planet since it does not meet the criteria listed below.

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There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the given statement is Slightly true.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

The formula of an ionic compound starts with a metal and that of a molecular compound starts with a nonmetal. The statement is Slightly true.

Therefore, the given statement is Slightly true.

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161.84kJ/mol of energy is required to activate the isomerization of methyl isocyanide,

It is given that the isomerization of methyl isocyanide follows first order kinetics. The half-lives t1/2 is 161min at T₁ 199°C and t1/2 is 5min at T₂ 230°C. The rate constant of first order kinetics is given by,

k = 0.693/half-life

On substituting the values we get,

k₁₉₉ = 0.693/161

k₁₉₉ = 4.3 x 10⁻³/min

Similarly,

k₂₃₀ = 0.693/12.5

k₂₃₀ = 0.055/min

To find the activation energy, the following formula is used

ln(k₁/k₂) = Eₐ/R(1/T₂ - 1/T₁)

On substituting the values we get,

ln(4.3 x 10⁻³/0.055) = Eₐ/8.314(1/503 - 1/472)

On solving the values on both sides we get,

Eₐ = 161.84kJ/mol

Therefore, the activation energy required for the isomerization of methyl isocyanide is 161.84kJ/mol

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Answer:

Satellite images

Explanation

Answer:

a

Explanation:

i think or c ok by g hope it helps

This problem is asking for the for pH when a solution of potassium hydroxide is diluted to the double of its initial volume. Thus, the answer turns out to be 11.0.

In chemistry, pH calculations are performed based on the following equation relating the pH and the concentration of hydrogen ions in the solution:

\(pH=-log([H^+])\)

However, since this problem involves a strong base, KOH as potassium hydroxide, one must calculate the pOH instead, and then convert it to pH with the following equations:

\(pOH=-log([OH^-])\\\\pH=14-pOH\)

In addition, due to the fact it is diluted from 10. mL to 20. mL (with the 10. mL of added distilled water), one needs to use the dilution equation in order to calculate the correct concentration of KOH:

\(M_1V_1=M_2V_2\\\\M_2=\frac{M_1V_1}{V_2} \\\\M_2=\frac{0.002M*10.mL}{20.mL}\\ \\M_2=0.001M\)

Hence, the pOH turns out to be:

\(pOH=-log(0.001)=3.0\)

And thereby the pH:

\(pH=14-3.0\\\\pH=11.0\)

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Answer:

To avoid spattering

Explanation:

If we are heating a hydrate to drive off the water of crystallization, we must initially heat the hydrate gently, at a lower temperature and then more strongly only after most of the water has been driven off in order to to prevent spattering.

Since we obtain the amount of water by the mass difference, Spattering  decreases the mass of water obtained and ultimately results in a lower percent of water being calculated for the hydrate.

Answer:

HF(aq)+NaOH(aq)→NaF(aq)+H2O(l)

Explanation:

Complete question

Dissolved hydrofluoric acid reacts with dissolved sodium hydroxide to form water and aqueous sodium fluoride. What is the net ionic equation

Equilibrium equation between the undissociated acid and the dissociated ions

HF(aq)⇌H+(aq)+F−(aq)

Sodium hydroxide will dissociate aqueous solution to produce sodium cations, Na+, and hydroxide anions, OH−

NaOH(aq)→Na+(aq)+OH−(aq)

Hydroxide anions and the hydrogen cations will neutralize each other to produce water.

H+(aq)+OH−(aq)→H2O(l)

On combining both the equation, we get –  

HF(aq)+Na+(aq)+OH−(aq)→Na+(aq)+F−(aq)+H2O(l)

The Final equation is  

HF(aq)+NaOH(aq)→NaF(aq)+H2O(l)

Answer:

3 g/cm³

Explanation:

45 - 20 = 25

The water level rose by 25 milliliters, meaning the volume of the rock is 25 cubic centimeters. (mL = cm³)

Density = mass/volume

75 grams/25 cm³ = 3 grams/1 cm³

The statement that is true concerning the information provided about the base molecule is the first base is stronger than the second base. That is option B.

A base is a substance that is capable of producing a hydroxide ion when dissolved in water.

A base can also be used for the production of salt and water when combined with an account d in a neutralisation reaction.

From the solution given,

A strong base is a base that is completely dissociated in an aqueous solution.

Therefore,the statement that is true concerning the information provided about the base molecule is the first base is stronger than the second base.

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Answer:

1. is "It produces sodium carbonate, a bitter metallic-tasting compound."
2. is 6:1

Explanation:

1. While baking powder does produce sodium bicarbonate or at least plays a part in creating sodium bicarbonate, its alkaline nature allows the dish or the reaction to avoid tasting metallic.

2. 6:1 because logically the more water there is in the flour, the less viscous it would be.

Let's see

moles of CO_2

Mass of CO_2

LEAST TO MOST POLAR- hexane,diethyl ether,acetone,n-propanol,water ,methanol

Considering the problem  we can say that the kids are compared to be more polar or smaller molecular weight compounds. The more polar compounds interact with silica more just as the kids bus stopped at every point and reached the destination late. Whereas, the adult bus is compared to be less polar compounds or high molecular weight which interacts less and reaches the destination faster.

Thus more polar compounds reaches the destination late whereas less polar compound reaches first.

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Answer: acetone

Explanation: Acetone has the weakest intermolecular forces, so it evaporated most quickly. Water had the strongest intermolecular forces and evaporated most slowly.

Answer:

"0.583" is the appropriate answer.

Explanation:

Let,

The initial constant of \(N_2O_4\) be "C".

Amount of \(N_2O_4\) dissociated into \(NO_2\) be "x".

now,

                                     \(N_2O_4 \rightleftharpoons 2NO_2\)

Initial constant               C            -

Equilibrium constant     C          2x

The Kc is given as:

⇒ \(K_c = \frac{[NO_2]^2}{[N_2O_4]}\)

         \(=\frac{(2x)^2}{C-x}\)

\(0.593=\frac{4x^2}{0.88-x}\)

  \(4x^2=0.593(0.88-x)\)

  \(4x^2=0.512-0.593\ x\)

     \(x=0.291\)

hence,

The constant of \(NO_2\) will be:

= \(2x\)

= \(0.583\)

The moisture content of the soil sample is approximately 27.6%. This means that the soil sample contains 27.6% water by weight.

The initial wet weight of the soil sample was 274.1 g. After drying overnight in an oven, the sample weighed 214.7 g. To calculate the moisture content of the soil sample, we can use the following formula:

Moisture Content (%) = (Wet Weight - Dry Weight) / Dry Weight * 100

Substituting the given values into the formula, we have:

Moisture Content (%) = (274.1 g - 214.7 g) / 214.7 g * 100

Simplifying the calculation:

Moisture Content (%) = 59.4 g / 214.7 g * 100

Moisture Content (%) ≈ 27.6%

Therefore, the moisture content of the soil sample is approximately 27.6%. This means that the soil sample contains 27.6% water by weight.

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Answer:

growth medium

Explanation:

The pathogenic bacteria are the bacteria which causes diseases. They may include fungi, worms, protozoa, viruses, bacteria, etc.

The bacterial pathogens are made to grow with the help of a growth medium which is developed to optimize the antigen's yield and also it maintains the integrity of the pathogenic bacteria.