Chlorine atom gains one electron in the outermost shell to complete the octet. On gaining one electron, a negatively charged chloride ion is formed.

The mass of aluminum required to produce 4.72 L of hydrogen gas at  stp from the reaction 27g.

Explanation:

13+14 =27.

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Answer:

Figure 1. In a calorimetric determination, either (a) an exothermic process occurs and heat, q, is negative, indicating that thermal energy is transferred from the system to its surroundings, or (b) an endothermic process occurs and heat, q, is positive, indicating that thermal energy is transferred from the surroundings to the system.

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To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.

To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.

If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).

However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.

In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.

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Answer:

B. II.

Explanation:

The idea of recrystallization works when the solubility of the target substance decreases as the temperature of the solution decreases.

The method of recrystallization involves dissolving the solute in a suitable hot solvent and then allow the solution to cool gradually. The pure solute dissolves in the hot solvent and then separates out of the solution as it is cooled to room temperature.

Hence recrystallization is preferred over solvent extraction when the desired compound is poorly soluble in the solvent pair at low temperatures and greatly soluble in the solvent pair at high temperatures.

The formation of the liquid crystal from the two different solutions is called crystallization.

The correct answer of the following is B.

The crystallization process depends on the following:-

The solute gets separated from the solution when the temperature of the solution rises. All the solute particles get attached to the thread and form a crystal

Hence, the correct option is B that is when the desired compound is poorly soluble in the solvent pair at low temperatures and greatly soluble in the solvent pair at high temperatures.

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Answer:

KCl is cost effective

Explanation:

In order to know this, we need to see how much it cost 1 g of each reactant. Let's begin with HCl

HCl:

In this case, let's calculate the moles of HCl in a 0.130 M solution and then, the mass of HCl using the molecular weight of 36.5 g/mol, to get the cost the HCl at the end using the given price:

nHCl = 0.130 moles/L * 0.5 L = 0.065 moles

mHCl = 0.065 moles * 36.5 g/mol = 2.3725 g

Cost HCl = 39.95 $ / 2.3725 g = 16.84 $/g

Conclusion, 1 g of HCl costs 16.84 $

KCl:

In this case, it's pretty obvious that 1 ton of KCl cost 10$, so, there is no need to do further calculations because 1 ton (or more than 1000 kg of the salt) it's just 10$. This is less expensive than the 16.84$ for just 1 g of HCl, so, final conclusion, KCl is more cost-effective.

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Answer:

C               (I think)

Explanation:

the levels are higher than they have ever been

Answer: b) calcium sulfide

Explanation:

the answer is that it is a

Combining "hydro" and "genes" in the context of the Latin roots, we can interpret it as "water origin" or "water-related origin."

The term "hydro" in Latin means "water." It is derived from the Greek word "hydor," which also signifies water. "Hydro" is commonly used as a prefix in scientific terms related to water or hydrogen. In the context of chemistry, "hydro" often denotes a compound or process involving water or hydrogen atoms. For example, hydrocarbon refers to organic compounds composed solely of hydrogen and carbon atoms.

On the other hand, "genes" in Latin is derived from the Greek word "genos," which translates to "origin" or "birth." In biology, the term "genes" refers to the segments of DNA that contain instructions for the development and functioning of living organisms. Genes determine various traits, such as physical characteristics, behavior, and susceptibility to certain diseases. They play a fundamental role in the transmission of hereditary information from one generation to another.

This interpretation aligns with the understanding that hydrogen, which is essential for life and abundant in water, plays a vital role in various biological and chemical processes.

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The percent ionic character of a molecule can be calculated using the following equation:

Percent Ionic Character = 100 × (μ/r)^2

Where μ is the dipole moment in Debye and r is the bond length in picometers.

Plugging in the given values, we get:

Percent Ionic Character = 100 × (1.39/121)^2

Percent Ionic Character = 100 × (0.0115)^2

Percent Ionic Character = 1.32%

What is dipole moment?

The dipole moment is a measure of the separation of positive and negative charges in a molecule. It is represented by the vector sum of the individual bond dipole moments and is measured in debyes (D).

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Answer:

The value of x in the hydrocarbon formula CxHy is 1.

Explanation:

Here's how to arrive at the solution:

Since the relative atomic mass of carbon is 12 and the hydrocarbon contains 9g of carbon, we know that there are 9/12 = 0.75 moles of carbon in the hydrocarbon.

Since the hydrocarbon only contains hydrogen and carbon, the remaining mass (12g - 9g = 3g) must be due to hydrogen.

To find the number of moles of hydrogen, we need to convert the mass of hydrogen to moles. The relative atomic mass of hydrogen is 1, so the number of moles of hydrogen is 3/1 = 3 moles.

Therefore, the ratio of carbon to hydrogen in the hydrocarbon is 0.75 moles of carbon to 3 moles of hydrogen, which simplifies to 1:4.

The general formula for the hydrocarbon can be written as CxHy. Since the ratio of carbon to hydrogen is 1:4, we know that x = 1 and y = 4. Thanks.

The theoretical yield of sodium sulfate, Na₂SO₄, formed from the reaction of 4.9 g of sulfuric acid, H₂SO₄ and 5.0 g of sodium hydroxide, NaOH is 7.1 g

First, we shall determine the limiting reactant. This is shown below:

H₂SO₄ + 2NaOH -> Na₂SO₄ + 2H₂O

From the balanced equation above,

98 g of H₂SO₄ reacted with 80 g of NaOH

Therefore,

4.9 g of H₂SO₄ will react with = (4.9 × 80) / 98 = 4 g of NaOH

From the above calculation, we can see that only 4 g of NaOH out of 5 g is needed to react with 4.9 g H₂SO₄.

Thus, the limiting reactant is H₂SO₄

Finally, we shall determine theoretical yield of sodium sulfate, Na₂SO₄ formed. Details below:

H₂SO₄ + 2NaOH -> Na₂SO₄ + 2H₂O

From the balanced equation above,

98 g of H₂SO₄ reacted to produce 142 g of Na₂SO₄

Therefore,

4.9 g of H₂SO₄ will react to produce = (4.9 × 142) / 98 = 7.1 g of Na₂SO₄

Thus, the theoretical yield of sodium sulfate, Na₂SO₄ formed is 7.1 g

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Answer:

191 °C

Explanation:

We'll begin by calculating the number of mole in 88.0 g of Ne. This can be obtained as follow;

Mass of Ne = 88.0 g

Molar mass of Ne = 20 g/mol

Mole of Ne =?

Mole = mass /molar mass

Mole of Ne = 88 / 20

Mole of Ne = 4.4 moles

Next, we shall determine the temperature. This can be obtained as follow:

Mole of Ne = 4.4 moles

Pressure (P) = 350 KPa

Volume (V) = 48.5 L

Gas constant (R) = 8.314 KPa.L/Kmol

Temperature (T) =?

PV = nRT

350 × 48.5 = 4.4 × 8.314 × T

16975 = 36.5816 × T

Divide both side by 36.5816

T = 16975 / 36.5816

T = 464 K

Finally, we shall convert 464 K to celsius temperature. This can be obtained as follow:

T(°C) = T(K) – 273

T(K) = 464 K

T(°C) = 464 – 273

T(°C) = 191 °C

Thus, the temperature is 191 °C

Answer:

8.96 g/mL

Explanation:

density = mass / volume

density = 134.3g / 15.0 mL

density = 8.96 g/mL

At some constant temperature, the equilibrium constant for the reaction below is Kc = .76. An empty 1.00L flask is charged with 2.00 mol carbon tetrachloride and then allowed to reach equilibrium. CCl4(g) ⇌ C (s) + 2 Cl2(g)

a. To find the fraction of the reactant (CCl4) remaining at equilibrium, we can start by determining the initial concentration of CCl4:
Initial concentration of CCl4 = moles/volume = 2.00 mol / 1.00 L = 2.00 M

Let x be the change in concentration of CCl4 at equilibrium. Then, the equilibrium concentrations are:
[CCl4] = 2.00 - x
[Cl2] = 2x
The equilibrium constant expression is given by:
Kc = [Cl2]^2 / [CCl4]
Plugging in the given Kc value (0.76) and the equilibrium concentrations:
0.76 = (2x)^2 / (2.00 - x)

Now, you can solve for x. The fraction of the reactant remaining at equilibrium is (2.00 - x) / 2.00.

b. To find the molarity of chlorine gas (Cl2) at equilibrium, you can use the value of x obtained in part (a). The molarity of Cl2 is equal to 2x.

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Answer:

8.22 x 10²³ atoms O

Explanation:

To find the amount of oxygen atoms, you need to (1) convert the mass of  P₄O₆** to moles (using the molar mass), then (2) convert moles P₄O₆ to moles O (using mole-to-mole ratio within P₄O₆), and then (3) convert moles to atoms (using Avogadro's Number). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs like the given value (50.0 = 3 sig figs).

Atomic Mass (P): 30.974 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (P₄O₆): 4(30.974 g/mol) + 6(15.999 g/mol)

Molar Mass (P₄O₆): 219.89 g/mol

1 mole P₄O₆ = 4 moles P and 6 moles O

Avogadro's Number:

6.022 x 10²³ atoms = 1 mole

 50.0 g P₄O₆            1 mole              6 moles O           6.022 x 10²³ atoms
---------------------  x  ------------------  x  --------------------  x  ------------------------------  =
                                219.89 g           1 mole P₄O₆                  1 mole

=  8.22 x 10²³ atoms O

**Phosphorus trioxide most commonly represents the molecule P₄O₆, but it can also represent P₂O₃. The answer would change depending on which molecule the question was referring to.

Answer:

c

Explanation:

chemicals can be found in every part of our lives

Considering the definition of pH, the pH is 6.35 and the solution is acidic.

pH is the Hydrogen Potential and it is a measure of acidity or alkalinity. pH indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]

The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.

In this case, being [H⁺]=4.5×10⁻⁷ M, you can replace this value in the definition of pH:

pH= -log (4.5×10⁻⁷ M)

Solving:

pH= 6.35

Finally, the pH is lower than 7, the solution is acidic.

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Element w is less reactive than elements x, y, and z. The element with the lower atomic number is typically less reactive.

Element w has an atomic number of 9, element x has an atomic number of 10, element y has an atomic number of 11, and element z has an atomic number of 12. Based on this information, we can conclude that element w is less reactive than elements x, y, and z.

This is because the reactivity of an element is largely determined by the number of valence electrons it has. Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical reactions. Elements with fewer valence electrons are less reactive because they are more stable. Element w has only one valence electron, while elements x, y, and z have two, three, and four valence electrons, respectively.

In general, elements with a full outermost shell of electrons, such as the noble gases, are the least reactive because they are highly stable. Elements that are close to having a full outermost shell, such as element w, are also relatively stable and less reactive. On the other hand, elements with only a few valence electrons, such as the alkali metals, are highly reactive because they are trying to gain or lose electrons in order to achieve a full outermost shell.

Overall, the reactivity of an element is determined by its electronic structure, with elements having fewer valence electrons generally being less reactive than those with more. In the case of the elements w, x, y, and z, we can see that element w has the fewest valence electrons and is therefore the least reactive.

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Answer:

619.465 kilometers

Explanation:

1609 m = 1 mile

so 385 miles is equal to 619465 meters (385 x 1609= 619465)

1000 meters = 1 km

so 619465 meters is 619.465 kilometers

Answer:

all of the above

Explanation:

i got the answer right on cK-12

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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Answer:

Meth- its full name is Methane

Explanation:

1 methane

2 ethane

3 propane

4 butane

5 pentane

6 hexane

7 heptane

8 octane

9 nonane

10 decane

11 undecane

12 dodecane

Answer:

I want to say (A) but i also want to say (C) but i can be wrong. most likely (C)

Explanation:

hope this helps lol and have a great day

Answer:

honestly this is kind of an opinionanated question because some people think that the vaccine dosen't work. Like I think that, but some other people might think differently so im gonna go with answer c.

Explanation:

Answer:

an orange would be considered a fruit

Explanation:

fruits have seeds while vegetables do not

Answer:

Speed is how far something goes in a unit of time.

Velocity is the same as speed but with direction.

Explanation:

Answer:

A) linear / linear

Explanation:

In this case, we have a triple bond beetween the atoms (See figure 1). If we have this triple bond we will have an Sp hybridization (in both carbons). We have to remember the relationship between the geometry and the hybridization:

-) Sp3 = Tetrahedral

-) Sp2 = Trigonal

-) Sp = Linear

Due to the hybridization, we will have a linear structure between the atoms. The angle between the atoms is 180º (See figure 2).

So, if we have a hybridization Sp for both carbons, we will have a linear geometry in each carbon. Therefore, the answer is A.