Which of the following is an ionic compound?
(A) CO₂
B) NH3
C) KBr
D) C12

Answer: The molarity of KBr solution is 0.605 M

Explanation:

Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L.

The formula used to calculate molarity:

[tex]\text{Molarity of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (mL)}}[/tex]       .....(1)

Given values:

Given mass of KBr = 54.0 g

Molar mass of KBr = 119 g/mol

Volume of the solution = 750 mL

Putting values in equation 1, we get:

[tex]\text{Molarity of solution}=\frac{54.0\times 1000}{119\times 750}\\\\\text{Molarity of solution}=0.605M[/tex]

Hence, the molarity of KBr solution is 0.605 M

Explanation:

An exothermic reaction is a "reaction for which the overall standard enthalpy change ΔH⚬ is negative." Exothermic reactions usually release heat and entail the replacement of weak bonds with stronger ones.

hope it helps

Answer:

Explanation:

Answer:

The value for the equilibrium constant for the reaction [tex]2SO2(g)+O2(g) <=> 2SO3(g) Kc=4.0*10^24\\[/tex] at 298K .

What would be the value for the equilibrium constant for the following reaction at the same temperature?

[tex]2SO3(g) <=> 2SO2(g)+O2(g)[/tex]

Explanation:

The Kc value for the reverse reaction of the first reaction that is:

[tex]2SO2(g)+O2(g) <=> 2SO3(g) Kc=4.0*10^{24}\\[/tex]

[tex]Kc=\frac{SO3^{2} }{SO2^{2}.O2 }[/tex]

For the reverse reaction,

[tex]2SO3(g) <=> 2SO2(g)+O2(g)[/tex]

[tex]Kc=\frac{SO2^{2}O2 }{SO3^{2}. }[/tex]

So, it is the inverse of the first Kc value.

Hence, the new Kc value is:

[tex]Kc=\frac{1}{4.0*10^{24} } \\ =2.5*10^{-25}[/tex]

Answer is :

Kc=2.5*10^-25.

Answer:

a).

[tex]2 \: moles \: of \: ethane \: react \: with \: 7 \: moles \: of \: oxygen \\ 24 \: moles \: react \: with \: ( \frac{24 \times 7}{2} ) \: moles \\ = 84 \: moles[/tex]

b).

[tex]2 \: moles \: react \: with \: 7 \: moles \\ ( \frac{12 \times 2}{7} ) \: moles \: react \: with \: 12 \: moles \\ = 3 .43 \: moles \\ 1 \: mole \: weighs \: 30 \: g \\ 3.43 \: moles \: weigh \: (3.43 \times 30) \\ = 102.9 \: g[/tex]

c).

746.7 g

Answer:

D

Explanation:

calicium exchange valency of 2 with 1 valency of chlorine

Answer:

I'm pretty sure it's The second one

Explanation:

That one is the only one that looks like it started on a positive 5

Answer:

B

Explanation:

Answer:

100 Precent

Explanation:

Took the exa,

Answer:

Up until now we have been discussing only the elemental forms of atoms which are neutrally charged. This is because the number of electrons (negative in charge) is equal to the number of protons (positive in charge). The overall charge on the atom is zero, because the magnitude of the negative charge is the same as the magnitude of the positive charge. This one-to-one ratio of charges is not, however, the most common state for many elements. Deviations from this ratio result in charged particles called ions.

Throughout nature, things that are high in energy tend to move toward lower energy states. Lower energy configurations are more stable, so things are naturally drawn toward them. For atoms, these lower energy states are represented by the noble gas elements. These elements have electron configurations characterized by full s and p subshells. This makes them stable and unreactive. They are already at a low energy state, so they tend to stay as they are.

The elements in the other groups have subshells that are not full, so they are unstable when compared to the noble gases. This instability drives them toward the lower energy states represented by the noble gases that are nearby in the periodic table. In these lower energy states, the outermost energy level has eight electrons (an “octet”). The tendency of an atom toward a configuration in which it possesses eight valence electrons is referred to as the “Octet Rule.”

There are two ways for an atom that does not have an octet of valence electrons to obtain an octet in its outer shell. One way is the transfer of electrons between two atoms until both atoms have octets. Because some atoms will lose electrons and some atoms will gain electrons, there is no overall change in the number of electrons, but with the transfer of electrons the individual atoms acquire a nonzero electric charge. Those that lose electrons become positively charged, and those that gain electrons become negatively charged. Recall that atoms carrying positive or negative charges are called ions. If an atom has gained one or more electrons, it is negatively charged and is called an anion. If an atom has lost one or more electrons, it is positively charged and is called a cation. Because opposite charges attract (while like charges repel), these oppositely charged ions attract each other, forming ionic bonds. The resulting compounds are called ionic compounds.

The second way for an atom to obtain an octet of electrons is by sharing electrons with another atom. These shared electrons simultaneously occupy the outermost shell of both atoms. The bond made by electron sharing is called a covalent bond. Covalent bonding and covalent compounds will be discussed in Chapter 4 “Covalent Bonding and Simple Molecular Compounds”.

At the end of chapter 2, we learned how to draw the electron dot symbols to represent the valence electrons for each of the elemental families.  This skill will be instrumental in learning about ions and ionic bonding. Looking at Figure 3.1, observe the Noble Gas family of elements. The electron dot symbol for the Nobel Gas family clearly indicates that the valence electron shell is completely full with an octet of electrons.  If you look at the other families, you can see how many electrons they will need to gain or lose to reach the octet state.  Above, we noted that elements are the most stable when they can reach the octet state. However, it should also be noted that housing excessively high negative or positive charge is unfavorable.  Thus, elements will reach the octet state and also maintain the lowest charge possible.   You will note that for the IA, IIA, IIIA and transition metals groups, it is more economical to lose electrons (1-3 electrons) from their valence shells to reach the octet state, rather than to gain 5-7 electrons.  Similarly main group columns VA, VIA, and VIIA tend to gain electrons (1-3) to complete their octet, rather than losing 5-7 electrons. Some atoms, like carbon, are directly in the middle.  These atoms don’t like to gain or lose electrons, but tend to favor the sharing model of chemical bonding. The remaining sections of this chapter will focus on the formation of ions and the resulting ionic compounds.

Explanation:

Answer: 7.36 moles of [tex]CaBr_2[/tex] will be produced.

Explanation:

We are given:

Moles of NaBr = 14.72 moles

The given chemical equation follows:

[tex]2NaBr+Ca(OH)_2\rightarrow CaBr_2+2NaOH[/tex]

By the stoichiometry of the reaction:

2 moles of NaBr produces 1 mole of calcium bromide

So, 14.72 moles of NaBr will produce = [tex]\frac{1}{2}\times 14.72=7.36mol[/tex] of calcium bromide

Hence, 7.36 moles of [tex]CaBr_2[/tex] will be produced.

Answer:

Explanation:

As organisms release energy during cellular respiration, carbon dioxide is produced from the carbon in energy storage molecules. ... Carbon dioxide in the biodome decreased because decomposers decreased which means there was a decrease in cellular respiration overall.

Answer:

2.5 mcg of iron

Explanation:

Density is given as;

D= m/v

Where;

m= mass

v= volume

mass= ?

volume= 6.5 ml or 0.065 dl

d= 39 mcg/dL

m= density × volume

m= 39 mcg/dL × 0.065 dl

m= 2.5 mcg of iron

Explanation:

I would say explosive eruptions caused by decompression of the dissolved gases in the magma. The Mt Pinatubo eruption is an example of a massive ash fall that eventually closed down an American base in the Philippines. And just recently the island of St. Vincent suffered major damage from ash fall due to a volcanic eruption.

Mg-19:

#protons = 12

#neutrons = 7

#electrons = 12

Mg-40:

#protons = 12

#neutrons = 28

#electrons = 12

The heat evolved when 74.6 g of sulfur dioxide (molar mass = 64.07 g/mol) is 2838kJ/mol. For the given thermochemical equation.

SO2(g) + 12 O2(g)

SO3(g)

AH = -99.1 kJ/mol

A balanced stoichiometric chemical equation known as a thermochemical equation contains the enthalpy change, ΔH.

There are two types of thermochemical reaction:

Thermogenic Reaction. certain thermochemical processes that absorb heat. Enthalpy change for this reaction is favorable.

Heat-producing Reaction. Exothermic reactions are those in which energy or heat are released during the reaction.

A chemical equation shows the initial molecule, reactants, and final products separated by an arrow, but a thermochemical equation is a balanced stoichiometric chemical reaction that also includes the enthalpy change.

Thus, 2838 kJ/mol heat evolved in given equation.

To learn more about thermochemical equation refer the link below;

https://brainly.com/question/10023358

#SPJ2

Answer:

D is the answer to your question in my opinion

Answer:

I think it is option A

Explanation:

XY 2 will be three molecules which is only a or b. As molecules are usually in a ddiagr like a, I would go with option a

Answer:

120 L

Explanation:

Step 1: Given data

Step 2: Convert the temperatures to the Kelvin scale

We will use the following expression.

K = °C + 273.15

K = 91°C + 273.15 = 364 K

K = 0.00°C + 273.15 = 273.15 K

Step 3: Calculate the final volume occupied by the oxygen

Assuming ideal behavior and constant pressure, we can calculate the final volume occupied by the oxygen using Charles' law.

V₁/T₁ = V₂/T₂

V₂ = V₁ × T₂/T₁

V₂ = 160 L × 273.15 K/364 K = 120 L

Answer:

B.

[tex]from \: eisteins \: energy \: relation : \\ E = hf \\ h \: is \: plancks \: constant\\ 3.26 \times {10}^{ - 19} = 6.63 \times {10}^{ - 34 } \times f \\ f = \frac{3.26 \times {10}^{ - 19} }{6.63 \times {10}^{ - 34} } \\ f = 4.92 \times {10}^{14} \: Hz[/tex]

Answer:

Por ejemplo, el petróleo o el carbón son ejemplos de recursos no renovables porque, aunque se forman mediante un proceso natural, este necesita demasiado tiempo. ... Esos combustibles fósiles provienen de materia orgánica, pero tardan cientos de miles de años en producirse.

oh sorry I'm American I can't understand that

Explanation:

but...thanks for points hehe

Answer:

14 g of N2

Explanation:

If we look at the options, we will notice that the correct answer needs to be a gas that has about half of the molecular mass of the gas.

If we consider nitrogen gas whose molecular mass is 28g/mol, half of the molecular mass is 14 g.

So;

28g of N2 contains 6.02 × 10^23 molecules of N2

14g of N2 contains 14 × 6.02 × 10^23 /28

= 3.0 x 10^23

Answer:

The industry represented in the photo is most likely fishing. Other industries that rely on accurate weather forecasts are shrimping, fishery, and aquaculture

Explanation:

Answer:

mother

Explanation:

Answer:

With my knowledge you got 2. correct, but that's all I could say.

Explanation:

Answer:

Explanation:

Did you get the answer to the test, I have the same one but don’t understand the questions that well

Answer:

La respuesta está en la explicación.

Explanation:

Las propiedades físicas son las visibles y medibles que no afectan químicamente la sustancia en cuestión. Las propiedades químicas hacen alusión a la reactividad de la sustancia:

Propiedades físicas ácido sulfúrico:

Líquido a temperatura ambiente.

Densidad: 1.83g/mL

Punto de fusión: 10°C

Punto de ebullición: 337°C

Índice de refracción: 1.397

Propiedades Químicas:

Ácido Fuerte.

Oxidante Fuerte.

Miscible con el agua reaccionando exotérmicamente.

A temperaturas > 30°C produce vapores azufrados.

Estable en concentraciones menores al 98%

Answer:

Hydroxyl (alcohol compound)

Explanation:

*view photo*

D. Hydroxy

Therefore, the correct option is option D.

Learn more:

brainly.com/question/696051

MgSO4 is the formula for magnesium