can anyone answer this please?​

Answer:

the answer is A

Explanation:

From the given data, the name of the hydrated salt would be  \(CoCl_2.83H_2O\).

The formula of the hydrated salt can be determined using the empirical formula approach. That is, we will find the mole equivalent of the anhydrous salt and the water of hydration and then combine them into a single formula after dividing by the smallest mole.

First, we need to determine the mass of the anhydrous salt and the water of hydration.

Mass of crucible (x) = 12.090 g

Mass of hydrated salt + crucible (y) = 16.250 g

Thus, the mass of the hydrated salt can be determined by subtracting x from y.

Mass of hydrated salt = 16.250 - 12.090 = 4.16 g

Mass of hydrate + crucible after evaporating off the water (z) = 12.424 g

Mass of anhydrous salt = z - x

                                      = 12.424 - 12.090

                                      = 0.334 g

Mass of water = 4.16 - 0.334

                        = 3.826 g

Now, let's find the moles:

Molar mass of \(CoCl_2\) = 129.839 g/mol

Molar mass of water = 18.01 g/mol

Mole of \(CoCl_2\) = 0.334/129.839 = 0.00257 mol

Mole of water = 3.826/18.01 = 0.2124 mol

Dividing through by the smallest mole

\(CoCl_2\) =  0.00257 / 0.00257  = 1

water = 0.2124/ 0.00257 = 83

Thus, the formula of the hydrate would be \(CoCl_2.83H_2O\)

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This element is in group 1.

According to the octet rule, this element would be expected to form an ion with a charge of +1.

If X is in period 5, the ion formed has the same electron configuration as the noble gas Krypton

The symbol for the ion is Rb⁺

Electronic configuration refers to the arrangement of electrons in the orbitals of an atom or molecule, indicating the energy level of the electrons, the number of electrons in each energy level, and the number of electrons in each orbital.

Considering the given element:

It has one valence electron, hence it is in group 1. Group 1 elements form ions with a charge of +1.

Losing one electron will give the ion the same electron configuration as Kyrton since it is the noble gas in Period 4.

The element is rubidium and the ion is Rb⁺.

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Ordinarily, at the end of the period, the anion produced has the same electron configuration as a noble gas.

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To determine which of the following covalent bonds would require the least energy to break apart in a given molecule: Energy Required to Break: The greatest energy to break is C—H, N—H, O—H, C—N, C—O, and C—C.

The energy needed to break a covalent link between two atoms is known as covalent bond energy. Atoms share electrons in their outer shell to create covalent bonds, which can result in a stable and energetically advantageous arrangement of electrons. The atoms involved, their electronegativities, and the length of the connection all affect how strong a covalent bond is. Covalent bonds often have higher electronegativities and shorter bond lengths. Covalent bonds between the atoms of carbon, hydrogen, oxygen, nitrogen, and phosphorus play a crucial role in the synthesis of complex macromolecules like proteins, nucleic acids, and carbohydrates in living things. Understanding covalent bond energy is crucial for formulating medications that can target specific biological molecules and for predicting the reactivity of compounds.

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Answer:

1.44 g

Explanation:

1. get number of nitrogen atoms in 9.79 grams of nitrogen

1 mole of Nitrogen is 6.022 x 10^23 atoms N which is = 14.01g N

2.

if 6.022 x 10^23 atoms of Nitrogen is 14

then x atoms  of Nitrogen is 9.79

3.

6.022 x 10^23/ x = 14/9.79 ->

x = 8.431 x 10^24 / 9.79 =

8.61799714478 x 10^23

4.

8.61799714478 x 10^23 atoms of N

6.022 x 1023 atoms of H have a mass of 1.008g, so

8.61799714478 x 10^23 atoms of H have a mass of (1.008/6.022 x 1023) x 8.61799714478 x 10^23) = 1.44250051072175g

1.44 g

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Answer:

salt water

Explanation:

beacuse it is made up of 2 elements,NaCl and H2O

From the specific heat capacity of mercury, the amount of heat energy required to raise the temperature of 4.0 g of mercury metal from 9.3 °C to 83.0 °C is 77.792 J.

The specific heat capacity of a substance is the amount of heat required to raise the temperature of a unit mass of the substance by one degree Celsius or kelvin.

The specific heat capacity of a substance is a constant that can be used to calculate the amount of heat required to raise the temperature of a given mass of a substance to any temperature.

The specific heat capacity of mercury is 0.140 J/g/k.

The formula for calculating specific heat capacity is given below:

Specific heat capacity, c = Δq/mΔT

where;

Δq = heat change

m = mass of the substance

ΔT = temperature change

The Heat required, Δq, will then be:

Δq = m * c * ΔT

Heat required, Δq = 4.0 * 0.140 * (83.0 - 9.3)

Heat required, Δq = 77.792 J

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Prior to writing the chemical formula of magnesium chloride, a question which any student will need to ask is: A.  What are the oxidation numbers of each atom?

A chemical formula can be defined as a scientific notation that is used to show (represent) the type and total number of atoms that constitute a particular chemical molecule or compound, by using the oxidation number, chemical symbols and subscripts.

Hence, a student would need to know the oxidation numbers of each atom when magnesium chloride is formed after a chemical reaction.

In Chemistry, an oxidation number represents the number of electrons gained or lost by an atom of a chemical element during a chemical reaction.

In conclusion, when magnesium chloride is formed, a question which the student will need to ask prior to writing the chemical formula is "what are the oxidation numbers of each atom?"

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Answer:

C. US and China

Explanation:

The biggest source of CO2 emissions are electricity + burning coal. Both the United States and China are huge industrial and producing countries, so the amount of CO2 these countries release is HUGE. Not to mention the high population of these countries also causes transportation pollution, i.e. car pollution. If I am incorrect please tell me.

Hope this helps!

The vapor pressure of the SiCl₄ in the mmHg at the 33.0 °C is the 312 mmHg.

The Clausius - Clapeyron equation is as :

ln ( P₂ / P₁ ) = ΔHvap / R ( 1 / T₁ - 1 / T₂ )

P₂ = P₁eˣ

Where,

The temperature, T₁  = 5.4 °C = 278.55 K

The temperature, T₂  = 33.0 °C= 306 K

The pressure, P₁ = 100 mmHg

ΔHvap is the heat of the vaporization = 30.2 kJ /mol = 30200 J/mol

The gas constant, R = 8.314 J / mol K

x = ΔHvap / R ( 1 / T₁ - 1 / T₂ )

x = 30200 / 8.314 ( 1/ 278.55 - 1/ 306 )

x = 1.05

P₂ = 100 \(e^{1.05}\)

P₂ = 312 mmHg

The vapor pressure of the  SiCl₄ is 312 mmHg.

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Answer: Warm Water and powdered lemonade.

Explanation: Water is faster at dissolving something and powder takes a smaller effort to dissolve.

Answer:

C

Explanation:

The order of reaction can be known from the rate equation.

The question is incomplete but I will try to explain the concept of order of reaction to you.

We have to note that when we talk about the order of the reaction what we mean is the order that we can be able to obtain from the stoichiometry of the reaction.

We do not only look at the reaction equation as we try to obtain the order of reaction but we rely so heavily on the empirical data that we can get from the reaction for the order of reaction in each specie.

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mol = conc × v

= 1.5 × 0.09

= 0.135 moles of HCl

HCl + NaOH > NaCl + H2O

1 mole HCl = 1 mole NaOH

0.135 mol HCl = x

x = 0.135 mol NaOH

mass = mol × molar mass

= 0.135 × 40

= 5.4 g

NaOH = 23 + 16 + 1 = 40 g/mol

I'm not a 100% sure if it's correct

The step comes after the observation stage in the scientific method

The scientific method is the process of objectively establishing  facts through testing and experimentation. The basic process involves making an observation, formulating a hypothesis, making a prediction, conducting an experiment and finally analysing the results.

7 steps of the scientific methods are  

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The reaction type which gives one product is a combination reaction.

What is a combination reaction?

Combination reactions are those in which two or more chemical entities join together to form a single product.

Generally, all the other types mentioned in the question can give single products under different circumstances but a combination reaction always gives a single product as shown in the above reaction.

4Fe  + 3O2  =  2Fe2O3

Hence, the answer is a combination reaction.

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The statement "Each member of a homologous series differs from its nearest neighbors by 14 amu" is true of members about a homologous series.

In organic chemistry, a homologous series unveils itself as a sequential assembly of compounds exhibiting an identical functional group, boasting akin chemical traits. Within this series, the constituents can either sport a branched or unbranched structure, or deviate through the molecular formula of CH2 and a molecular mass variation of 14u.

This divergence may manifest as the elongation of a carbon chain, as observed in the linear alkanes (paraffins), or as the augmentation in the count of monomers forming a homopolymer, such as amylose.

The entities belonging to a homologous series typically embrace a fixed assortment of functional groups, thereby conferring upon them resemblant chemical and physical characteristics.

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Viscosity, conductivity, and density are all physical properties that can be affected by solute concentration, but vapor pressure will not distinguish the two solutions from each other.

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid form. The vapor pressure of a solution depends on the vapor pressure of the pure solvent and the mole fraction of the solute. If two solutions have the same solute concentration, they will have the same mole fraction of solute and the same vapor pressure, even if they contain different salts.

Therefore, vapor pressure will not distinguish the two solutions from each other. However, viscosity, conductivity, and density can all be used to distinguish the two solutions. The viscosity of a solution depends on the size and shape of the solute molecules and their interactions with the solvent molecules. The conductivity of a solution depends on the presence of ions and their mobility. The density of a solution depends on the mass and volume of the solute and solvent. By measuring these properties, a chemist can determine the properties of the solute and determine if the two solutions are different.

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Answer:

C

Explanation:

The third law of thermodynamics states that at absolute zero temperature, the entropy of a perfect crystal is zero. In other words, as the temperature of a system approaches zero, the entropy also approaches a constant value.

The law only holds true only if the crystal has minimal energy and only exist in one state. The entropy becomes zero as the temperature also becomes zero only for a perfect crystal. Otherwise, the law refuses to hold.

The correct option is, therefore, C.

When dissolved in water, most Group 1 metal salts can be described as strong electrolytes.

When Group 1 metal salts are dissolved in water, they can be described as strong electrolytes. This is because Group 1 metals, such as lithium (Li), sodium (Na), potassium (K), and so on, readily lose their outermost valence electron to form positive ions (cations). These cations then dissociate completely in water, separating from the anions to which they were originally bonded.

The dissociation of Group 1 metal salts in water results in the formation of positively charged metal ions and negatively charged non-metal ions (anions). These ions are free to move and conduct electric current, making the solution a good conductor of electricity. The complete dissociation of Group 1 metal salts in water and the presence of freely moving ions make them strong electrolytes.

Strong electrolytes are substances that ionize completely or almost completely in solution, producing a high concentration of ions. This is in contrast to weak electrolytes, which only partially ionize and produce a lower concentration of ions.

In summary, when Group 1 metal salts are dissolved in water, they form strong electrolytes due to their ability to dissociate completely into ions, leading to a high concentration of freely moving ions in the solution, thus enabling efficient electrical conductivity.

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Magnesium bromide is the limiting reagent, and the amount of \(MgCl_{2}\) formed will be limited by the amount of magnesium bromide available. The excess reactant will be sodium chloride.

What is limiting reagent?

To determine which of the two reactants, magnesium bromide or sodium chloride, is the limiting reagent, we need to calculate the amount of product that can be formed from each reactant and compare the results.

Let's assume that magnesium bromide and sodium chloride react to form magnesium chloride and sodium bromide, and the balanced chemical equation for the reaction is:

\(MgBr_{2}\) + 2NaCl → 2NaBr + \(MgCl_{2}\)

The molar masses of each compound are:

The first step is to calculate the number of moles of each reactant, given that we have 2 grams of each:

moles of \(MgBr_{2}\) = 2 g / 184.11 g/mol = 0.01085 mol

moles of NaCl = 2 g / 58.44 g/mol = 0.03423 mol

Now, we can use the stoichiometry of the balanced equation to calculate the theoretical yield of product for each reactant:

Using \(MgBr_{2}\): 0.01085 mol \(MgBr_{2}\) x (1 mol \(MgCl_{2}\) / 1 mol \(MgBr_{2}\)) x (95.21 g \(MgCl_{2}\) / 1 mol \(MgCl_{2}\)) = 1.034 g \(MgCl_{2}\)

Using NaCl: 0.03423 mol NaCl x (1 mol \(MgCl_{2}\) / 2 mol NaCl) x (95.21 g \(MgCl_{2}\) / 1 mol \(MgCl_{2}\)) = 1.633 g \(MgCl_{2}\)

From the above calculation, we can see that the theoretical yield of \(MgCl_{2}\) is lower when magnesium bromide is used as the reactant (1.034 g), compared to when sodium chloride is used (1.633 g). Therefore, magnesium bromide is the limiting reagent, and the amount of \(MgCl_{2}\) formed will be limited by the amount of magnesium bromide available. The excess reactant will be sodium chloride.

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Complete question is: if given 2 grams of magnesium bromide and sodium chloride; magnesium bromide would be the limiting reagent.

The limiting reagent would be the magnesium bromide because it is present in the smallest quantity.

Magnesium is a silvery-white chemical element and is the ninth most abundant element in the universe. It is a key component of chlorophyll and is essential for plant and animal life. Magnesium is also an important mineral for human health, playing a role in over 300 biochemical processes in the body. It is involved in energy production, DNA and RNA synthesis, and muscle, nerve, and enzyme function. Magnesium is found in many foods, including green leafy vegetables, nuts, seeds, and whole grains. Magnesium supplements are also available and are commonly used to help prevent or treat magnesium deficiency.

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Answer:

A.) 5.69 x 10¹⁴ Hz

Explanation:

To find the wavelength, you need to use the following equation:

c = λf

In this equation,

-----> c = speed of light (2.998 x 10⁸ m/s)

-----> λ = wavelength (m)

-----> f = frequency (Hz)

Before you can use the equation, you need to convert the wavelength from nanometers (nm) to meters (m).

1 x 10⁹ nm = 1 m

527 nm                1 m
--------------  x  --------------------  =  5.27 x 10⁻⁷ m
                         1 x 10⁹ nm

c = λf                                                         <----- Equation

2.998 x 10⁸ m/s = (5.27 x 10⁻⁷ m)f           <----- Insert values

5.69 x 10¹⁴ = f                                          <----- Divide both sides by 5.27 x 10⁻⁷

Answer:

less than 4.9 newtons Explanation:

Answer:

index fossil

Explanation:

mass percent = (mass of element in 1 mole of compound / mass of 1 mole of compound) x 100. The formula for a solution is:

mass percent = (grams of solute / grams of solute plus solvent) x 100. or.

mass percent = (grams of solute / grams of solution) x 100. The final answer is given as %.

Hope this helps!!

Answer:

ch3:-methanide

No2:-nitrogen dioxide

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Answer:

B and C

Explanation:

B and C two statements describe a mixture.

A mixture is composed of one or more pure substances in varying compositions.

When two or more substances are combined together in such a way that each remains unchanged Sand and sugar form a mixture.

Its parts can be separated using physical means.

It includes atoms of different elements.

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Answer:

ty

Explanation:

your question is invalid