Which noble gas does not have a true octet

Answer:to see how it effects

Explanation:

a control group provides a baseline for the experiment, shows how the independent variable influenced the experiment and influenced the outcome. a control group provides a comparison for the experiment

Answer:

48

Explanation:

So all we have to consider here is the atomic number. Remember that in a neutral atom the amount of electrons = the amount of protons.

Also that the atomic number = the number of protons.

So we can say that in an atom with atomic number 48, there are 48 protons and therefore 48 electrons.

An atom of an element with an atomic number of 48 and mass number of 120 contains 48 electrons, indicating that it is a neutral atom. The number of neutrons can be determined by subtracting the atomic number from the mass number, which in this case, gives 72 neutrons.

The atomic number of an element 48 in this case, defines the number of protons in its nucleus and also, in a neutral atom, the number of electrons. Therefore, an atom of an element with an atomic number of 48 contains 48 electrons. The mass number (120) is the sum of the number of protons and neutrons in the atom's nucleus. To find the number of neutrons, we subtract the atomic number from the mass number (120-48), which gives us 72 neutrons.

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Answer:

Explanation:

The process of dissolving carbon dioxide in water and soft drinks is called carbonation, when there is a fizz, the carbon dioxide escapes from the water as an effervescence.

Due to the increase in atmospheric pressure in the mine, the ability of the dissolved carbon dioxide in the drink to escape is reduced, this accounts for why the drinks tastes flat.

When the miner gets to the ground surface, the atmospheric pressure becomes normal, so in the miner's stomach the carbon dioxide in the soft drink escapes and this results in the miner's continuous belching.

Answer:

Symbols of elements

Explanation:

Symbols of elements corresponding to their names do not vary systematically in the periodic table. The only systematic variation might be an alphabetical order, either ascending or descending, but we don't see this trend in the periodic table.

The other properties, however, vary systematically:

Answer:

Option A: Second equation by 2 and reversing the first equation

Explanation:

In order for the equation to become balanced by elements, dividing the second equation by 2 and then reversing the first equation to simplify the equation correctly is how you can then add the intermediate chemical equations. Took the test on edg and it was correct :)

In the final chemical equation, HF and O₂ are the products that are formed through the reaction between H₂O and F₂. Before you can add these intermediate chemical equations, you need to alter them by multiplying the second equation by 2 and reversing it and the correct option is option D.

A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side

They provide brief information about the amount of chemicals participating in a reaction.

In the given reaction,

Multiplying the second equation by 2 gives -

2H₂ + 2F₂ = 4HF

And then reversing it and adding to the first one gives -

      4HF = 2H₂ + 2F₂

2H₂ + O₂ = 2H₂O

The hydrogens on both the sides cancel out and we are left with

                                       4HF + O₂ = 2H₂O + 2F₂

Therefore, In the final chemical equation, HF and O₂ are the products that are formed through the reaction between H₂O and F₂. Before you can add these intermediate chemical equations, you need to alter them by multiplying the second equation by 2 and reversing it and the correct option is option D.

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Answer:

C. Hydrogen is the limiting reactant

Explanation:

Mole ratios are determined using the coefficients of the substances in the balanced chemical equation of reaction.

H2 + Cl2 -----> 2HCl

1mol:1mol 2mol

1mol of H2 reacts with 1 mole Cl2 to produce 2 moles of HCl.

From the above question, the amount of moles for H2 and for Cl2 are given as well as the amount of HCl each will produce.

We know the following now:

•1 mole of H2 gives 2 moles of HCl. •Thus, 4 molecules of H2 will produce 8 molecules of HCl.

•4 molecules of Cl2 will also produce 8 molecules of HCl.

•Likewise, 6 molecules of Cl2 will produce 12 molecules of HCl

•6 molecules of H2 will also produce 12 molecules of HCl BUT we do not have 6 molecules of H2!! We have only 4!! (From the question) .

This makes us short of H2 molecules. That is, the amount of H2 is in limited supply, which makes H2 the limiting reactant while Cl2 is in excess.

Therefore, we can only make 8 moles of HCl instead of 12 moles.

The best statement which describes the role of hydrogen in this chemical reaction is that hydrogen is the limiting reactant.

Answer:

C) the reactant in excess produces the greatest amount of product.

Explanation:

The statement that is NOT true is that the reactant in excess produce the greatest amount of product. The key to production is the limiting reactant. Reactants in excess have nothing to react with!

Answer:

because its water

Explanation:

Answer:

Hydrogen has one valence electron, Atoms may share electrons in order to fill their electron shells, Oxygen has two vacancies in its electron shell, but carbon has four vacancies.

Explanation:

i jus did it on study island :P

Answer:

Acid-Base

Combustion

Combination

Decomposition

Explanation:

(1)  KOH is acid and HBrO is a base which reacts to form water , thus it is an example of acid-base reaction.

(2) In the reactants Oxygen gas is used , whenever Oxygen comes in a reaction it is an example of Combustion reaction as the other reactant starts burning.

(3) Here two reactant combines to produce a single product , thus it is an example of Combustion Reaction.

(4) Here A single reactant decomposes to form two products in this reaction , thus it is an example of Decomposition Reaction.

Answer:

3) increase in the average temperature of Earth

Explanation:

Coronal mass ejections or CME is the phenomena described as "Scientists have observed huge bubbles of gas ejecting from the sun". Whilst CMEs can happen alongside solar flares, it is also important to know that they can occur by themselves (independently). Solar flares refers to the abrupt release of energy kept in twisted magnetic fields caused by explosions on the Sun.

When these solar flares hit the earth, the gases (gas molecules) in the upper atmosphere such as nitrogen and water vapor are broken up and freed. This new gases then react with molecules in the ozone layer and reduce its layer. Consequently, the result is that there is increase in the average temperature of Earth.

Hence, option 3 is the event most likely to occur due to this solar condition

Answer:

C.  increase in the average temperature of Earth

Explanation:

Answer:

Temperature is an indicator of average kinetic energy

Explanation:

Temperature of any substance is proportional to the average kinetic energy associated with the random motion of the atoms or molecules from which substances are formed.

Explanation:

The law of conservation of mass states that the total mass of the products is equal to the total of the reactants.

A chemical change occurs because of a chemical reaction.

In a chemical reaction, the reactants are the starting substances and the products is the finishing substances. The amount of each type of atoms to start with and end with are also equal.

No matter disappears after a chemical reaction.

Answer:

The amount of matter in the new substances is the same as the original.

This is known as the law of conservation of mass.

Final answer:

In a chemical change, the law of conservation of matter indicates that the total amount of matter remains constant, with atoms being rearranged but not created or destroyed.

Explanation:

When a chemical change occurs, the amount of matter in the new substances remains unchanged according to the law of conservation of matter. This fundamental principle asserts that during any chemical reaction, matter is neither created nor destroyed. Instead, the atoms are simply rearranged to form new substances. Therefore, the number and type of atoms present after a chemical change are the same as those before the change took place.

The formation of new substances implies that one kind of matter is transformed into a different kind. Although the properties and appearance might change significantly, the total mass remains constant. For everyday chemical reactions, any mass changes are too negligible to measure, and thus the law holds true. However, in nuclear reactions, which involve changes to the nucleus of an atom, the energy changes can be significant enough to result in detectable mass changes. In such cases, the laws of conservation of matter and energy are considered in a combined way to reflect that the total quantity of matter and energy is fixed.

Answer:

Becuse magnesium is a earth alkaline metal and oxygen is a nonmetal(read explanation)

Explanation:

Magnesium has 2 valence electrons where oxygen has 6 valence electrons. Magnesium has tendency to give electrons to oxygen and oxygen has tendency to gain electrons. They are both trying to complete their last shell to 8 which is called the octet rule. Because they both want to complete each other because of the reasons that I told they combine to be stanle atoms like noble gases.

The percentage composition of the nitrogen in N₂H₄ is 87.5%

The percentage composition of an element in a compound can be obtained by using the following formula:

Percentage = [tex]\frac{mass of element }{mass of compound }[/tex] × 100

With the above formula, we can obtain the percentage composition by mass of nitrogen in N₂H₄ as illustrated below:

Molar mass of N₂H₄ = 32 g/mol

Mass of N in N₂H₄ = 2N = 2 × 14 = 28 g/mol

Percentage = [tex]\frac{mass of element }{mass of compound }[/tex] × 100

Percentage of nitrogen = [tex]\frac{28}{32}[/tex] × 100

Percentage of nitrogen = 0.875 × 100

Therefore, the percentage composition of the nitrogen in N₂H₄ is 87.5%

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The percent composition by mass of nitrogen in N2H4 is 87.56%.

To find the percent composition by mass of nitrogen in N2H4, we must perform the following calculations:

(28.02 g N / 32 g N2H4) × 100 = 87.56%

Therefore, the percent composition of nitrogen in N2H4 is 87.56%.

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Answer:

x = 2.2*10^23 molecules of H2O

Explanation:

H = 1g

O = 16g

H2O = 1g*2 + 16g

H2O = 18g = 1 mol of H2O

18 g___1 mol of H2O

6.38g__ x = 0.354 mol of H2O

1 mol______6.22*10^23 molecules

0.354 mol__x = 2.2*10^23 molecules of H2O

Answer:

m = E × Q

And Q = I × t

m = E × I × t

Where m = mass in grams

Q = quantity of electricity in coulomb

I = current in ampere

t = time in seconds

E = electrochemical equivalent of the substance

Explanation:

Answer:

c.mountain ranges

Explanation:

scientists wondered how they where formed and came to the conclusion that they might be forced upward by movement of the earths crust

Answer:

mountain ranges

Explanation:

The world's tallest mountain ranges form when pieces of Earth's crust—called plates—smash against each other in a process called plate tectonics, and buckle up like the hood of a car in a head-on collision.

Answer:

The answer in the comments is wrong! It's not even an option on the test. Just letting people know.

Explanation:

Among the following, temperature is most directly related to the thermal energy. It is the energy acquired by body by the  absorption of heat.

Thermal energy is a form of energy  acquired by increasing the temperature of a body.  Thermal energy of a body is directly proportional to the temperature of the  body.

Kinetic energy is generated by virtue of motion of a body. Thus only a moving body will gain kinetic energy. For a moving body, as thermal energy increases, kinetic energy also increases.

Potential energy is generated by virtue of the position of an object which is in a height from the surface. The kinetic energy and potential energy together called as mechanical energy. They are related with the temperature.

However, the temperature is most directly related to thermal energy. Thus option D is correct.

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Answer: BeCl2

Explanation:

Be + Cl2 —> BeCl2

Answer:BeCl2

Explanation:

Reaction between Beryllium (Be) a di-ionic cation and Chlorine a mono-ionic forms BeCl2.

Answer:

Flammability is a material’s ability to burn in the presence of oxygen.

Explanation:

Flammability can be described as the ability of a substance to get ignited. Flammability will lead to fire or combustion. Some substances are highly flammable like Benzene. Other tend to be just flammable. And there are also compounds which will nor be flammable at all as they won't react with oxygen. Examples of these substances include helium, steel or glass.

The flammability of a substance shall be considered a very important aspect when storing or transporting a substance.

Answer:

From the lemonade towards the ice

Explanation:

According to the second law of thermodynamics, heat spontaneously flows from hotter objects to colder objects.

In the context of this problem, we have lemonade at, say, room temperature, as well as ice at either equilibrium temperature at the freezing point of water (0 degrees Celsius) or below. This means that the lemonade here is hotter than the ice.

Based on the second law of thermodynamics, heat would flow from the lemonade (the hotter object) towards the ice (the colder object). This is the reason why ice melts: it gains heat from a hotter object and its temperature increases.

Answer:

Polyhydroxyl alcohols

Explanation:

Whenever we have several C-OH bonds, we have a polyhydroxyl alcohol. For example, if we have just one alcohol group, that is, an R-OH group, then the naming is simple, say, we have EtOH, it's ethanol.

The problem becomes more complicated when we have several hydroxyl groups present in the alcohol. Let's say we have an ethane molecule and we replace the hydrogen atoms of carbon 1 and 2 with hydroxyl groups. In that case, we have 1,2-ethanediol. Similarly, we can have triols etc.

That said, we have poly (several) hydroxyl groups and we can generalize this to having polyhydroxyl alcohols.

Answer:

Explanation:

Polyhydroxyl alcohols

Answer:

0.09639M

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

H2SO4 + 2KOH —> K2SO4 + 2H2

The following were obtained from the balanced equation

Mole of the acid (nA) = 1

Mole of the base (nB) = 2

Step 2:

Data obtained from the question. This includes:

Concentration of acid (Ca) =?

Volume of acid (Va) = 15mL

Concentration of base (Cb) = 0.09886M

Volume of base (Vb) = 29.25mL

Step 3:

Determination of the concentration of the acid.

Applying the equation:

CaVa/CbVb = nA/nB

The concentration of the acid can be obtained as follow:

CaVa/CbVb = nA/nB

Ca x 15 / 0.09886 x 29.25 = 1/2

Cross multiply to express in linear form

Ca x 15 x 2 = 0.09886 x 29.25 x 1

Divide both side by 15 x 2

Ca = (0.09886 x 29.25) / (15 x 2)

Ca = 0.09639M

Therefore, the concentration of the acid is 0.09639M

Answer:

0.09639 M acid

Explanation:

Answer:

Cardiac muscle cells are found only in the heart, and are specialized to pump blood powerfully and efficiently throughout our entire lifetime. Four characteristics define cardiac muscle tissue cells: they are involuntary and intrinsically controlled, striated, branched, and single nucleated.

Explanation:

Cardiac muscle is a specialized type of muscle tissue found only in the heart. It has a striated appearance, is under involuntary control, contains intercalated discs for coordinated contraction, and is highly endurance.

Cardiac muscle is a specialized type of muscle tissue found only in the heart. It has unique characteristics that allow it to efficiently contract and relax, enabling the heart to pump blood throughout the body.

Some key characteristics of cardiac muscle include:

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Answer:

The charges did not transfer from the cation to the anion to yield the correct subscripts

Explanation:

First of all, we see that we have [tex]Al^{3+}[/tex] and [tex]O^{2-}[/tex] in this ionic compound. Since this is a substance, it has a net charge of 0. This means the charge of a cation should be balanced by the charge of the anion.

The lowest common multiple of 3 and 2 is 6, meaning we need:

Oxygen needs a total of 8 valence electrons, as it's the anion and it gains electrons to obtain an octet. We have 3 oxygen anions in total. Normally, oxygen has 6 electrons, so it needs to gain 2 electrons for each of the 3 oxygen atoms, that is, gain a total of 6 electrons. Those 6 electrons are donated by two aluminum atoms (each having 3 valence electrons), so two aluminum cations are balanced by three oxygen anions.

The Lewis diagram is correct, as it shows an octet on oxygen. We also have the correct charges. The subscripts, though, have to be 2 and 3 for Al and O respectively.

Answer:

Mass of aluminium in sample = 3.591 g ≅ 3.6 grams

Explanation:

Given that,  A sample of aluminum absorbs 50.1 J of heat, upon which the temperature of the sample increases from 20.0°C to 35.5°C.

the specific heat of aluminum is 0.900 J/g- °C

The relation between heat absorbed and change in temperature is given by,   Q = msΔT.

where Q = heat absorbed

            m = mass of the substance

            s = specific heat of substance

          ΔT  = change in temperature

Now, in our case, Q = 50.1 J ; s = 0.900 J/g- °C; ΔT= 35.5-20 = 15.5°C

⇒ m =  [tex]\frac{Q}{s(T_{2} -T_{1}) }[/tex]

⇒ m = [tex]\frac{50.1}{0.900(15.5)}[/tex] = 3.591 g ≅ 3.6 g

⇒ m ≅ 3.6 g

To calculate the mass of the aluminum sample, the heat absorbed was divided by the product of the specific heat capacity of aluminum and the change in temperature, resulting in a mass of approximately 3.59 grams.

To find the mass of the aluminum sample, we'll use the following specific heat formula:

Q = mcΔT

Where:

From the question:

Rearranging the formula to solve for mass (m), we get:

m = Q / (cΔT) = 50.1 J / (0.900 J/g°C × 15.5°C)

Calculating the mass of the aluminum gives us:

m = 50.1 J / (13.95 J/g) ≈ 3.59 grams

Answer:

The solution is made up of the solvent and solute.

The solvent and solute are separated by physical means.

Explanation:

Any mixture must have a solvent and solute, or else it can't be classified as a mixture.

Additionally, I took a test and debated between the "distillation" and "physical means" problem, and got the "distillation" one wrong. It does make sense; evaporation is a physical mean through which the solvent is separates from the solute, even if it isn't caused by humans.

The 4th one just sounds absurd, and I would be shocked if it were correct.

Answer:

The P6 block of the periodic table is the block that belong to the noble gases. The noble gases in P6 block are: Helium, neon, argon, krypton, xenon and radon

Explanation:

P-block elements in periodic table is non-metals. The elements which belongs to p⁶ block are noble gases, i.e., helium, neon, argon, krypton, xenon and radon.

Nobel gases are inert gases having completely filled orbitals. Hence they are normally unreactive. Noble gases are non-metals and exists in gaseous state.

Noble gases are termed as p⁶ elements because, their valence p orbital is  completely filled by 6 electrons.  Therefore the noble gases helium, neon, argon, krypton, xenon and radon are termed as p⁶ block elements.

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Question:

1. (NH)2CrO

a) Number of moles of H:

b) Number of moles of N:

Answer:

a) Number of moles of H: 2

b) Number of moles of N: 2

Explanation:

The  [tex](NH)_2CrO[/tex] is ammonium Chromate which is monoclinic and yellow Crystal that is formed due to the reaction of ammonium Hydroxide and ammonium di-chromate. It is used as catalyst, corrosion inhibitor as well as analytical inhibitors.

Question:

2. Ag.SO.

a) Molar Mass:

b) Percent Composition of Ag:

c) Percent Composition of S:

d) Percent Composition of O:​

Answer:

a) Molar Mass:   155.93 Kg

b) Percent Composition of Ag:   69%

c) Percent Composition of S:  20.5%

d) Percent Composition of O:​ 10.2%

Explanation:

Molar mass =   molar mass of Ag +  molar mass of S +  molar mass of O  

=>107.87+32.06+16

=> 155.93 Kg

Percent Composition of Ag

= [tex]\frac{ \text{mass due  to Ag}}{\text {total molar mass}}  \times 100[/tex]

= [tex]\frac{107.87}{155.93} \times 100[/tex]

= 0.69 \times 100

= 69%

Percent Composition of S:

= [tex]\frac{ \text{mass due  to S}}{\text {total molar mass}}  \times 100[/tex]

=[tex]\frac{32.06}{155.93} \times 100[/tex]

= 0.205 \times 100

= 20.5%

Percent Composition of O:

= [tex]\frac{ \text{mass due  to O}}{\text {total molar mass}}  \times 100[/tex]

= [tex]\frac{16.00}{155.93} \times 100[/tex]

= 0.102 \times 100

= 10.2%

4)

Under the kinetic-molecular theory of gases, one important assumption about the properties of an ideal gas is that the collision between gas molecules is perfectly elastic. This means that during collisions, there is no net loss or gain of kinetic energy. The gas molecules simply exchange energy, changing direction and speed, but the total energy of the system remains constant.

This assumption is crucial in understanding the behavior of ideal gases because it helps explain various gas properties, such as the relationship between pressure, volume, and temperature. The perfectly elastic collisions allow the gas molecules to freely move and exert pressure on the walls of the container.

5)

To convert degrees Celsius to Kelvin, you simply add 273.15 to the temperature in Celsius.

In this case, to convert 34 degrees Celsius to Kelvin, you would add 273.15:

34 degrees Celsius + 273.15 = 307.15 Kelvin

Therefore, the temperature expressed as Kelvin is 307 Kelvin.