Give the number of valence electrons in krypton. Write out the electronic configuration for the valence electrons. Valence electrons: _______ Electronic configuration for the valence electrons: ________

Answer:

The correct expression used for solubility is a. grams per 100 grams of solvent. One of the most commonly used methods for expressing the concentrations is molarity.

Answer:

[tex] \huge{4.969 \times {10}^{ - 19} \:J }[/tex]

Explanation:

The energy of the purple lamp can be found by using the formula

E = hf

where

E is the energy

f is the frequency

h is the Planck's constant which is

6.626 × 10-³⁴ Js

From the question.

[tex] f = 7.5 \times 10^14 \: Hz [/tex]

We have.

[tex] E = 6.626 \times 10^{-34} \times 7.5 \times 10^{14} [/tex]

We have the final answer as

[tex]4.969 \times {10}^{ - 19} \: J[/tex]

Identify the substance as an acid or a base and put an "X" in the box lemon juice is the acid sodium hydroxide is the base and ammonia is the weak base and HCl is the strong acid

An acid is the any hydrogen containing substances that is capable of donating a proton to another substances and base is the molecule or ion able to accept a hydrogen ion from acid and acidic substances are usually identified by their sour taste and here given example are lemon juice acidic because they contain high amount of citric acid and sodium hydroxide is the base because they dissociate completely into the solution to form hydroxide ion and ammonia is the weak base because nitrogen atom has electron pair that easily accept a proton and HCl is the strong acid because  it dissociate almost completely

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Answer

Temperature of the room

Explanation

The room temperature can be controlled compared to all other options.

We want the mass of NaOH, Given:

V = 27.0 mL = 0.0270 L

C = 2 M

Given the concentration and volume we can find the number of moles of NaOH, and then convert it to mass.

C = n/V (or Molarity = moles of solute/litres of the solution) where C is the concentration or molarity, n is the number of moles of the solute and V is the volume of the solution

n = Cv

n = 2 x 0.0270 L

n = 0.054 mol

Now that we have the number of moles, we can get the mass of NaOH. Molar mass of NaOH = 39,997 g/mol

n = m/M where m is the mass and M is the molar mass

m = nM

m = 0.054 mol x 39,997 g/mol

m = 2.16 g

Initial Pressure = P₁ = 0.930 atm

Final Pressure = P₂ = ?

Initial Volume = V₁= 96.2 mL

Final Volume = V₂ = 44.7 mL

Temperature = constant

If we consider that ammonia as an Ideal Gas, and since the temperature is constant we can apply Boyle's Law. It says that at constant temperature:

P₁ * V₁ = P₂ * V₂

If we divide at both sides by V₂:

P₁* V₁ / V₂ = P₂ * V₂ / V₂

On the right side we can cancel V₂ and we get:

P₁* V₁ / V₂ = P₂

P₂ = P₁* V₁ / V₂

Replacing by the values that we were given:

P2 = 0.930 atm * 96.2 mL / (44.7 mL)

P2 = 2.00 atm

So the final pressure is 2.00 atm

Answer

19.6 grams

Explanation

Given:

Mass of calcium phosphate produced = 50.500 g

Equation: 3Ca(s) + 2H3PO4(aq) ---> Ca3(PO4)2(s) + 3H2(g)

What to find:

The grams of calcium required to produce 50.500 g of calcium phosphate.

Step-by-step solution:

From the equation, 3 mol Ca produce 1 mol Ca3(PO4)2

1 mole Ca3(PO4)2 = 310.19 grams

1 mole Ca = 40.078 grams

This means, (3 x 40.078 g) = 120.234 g Ca produce 310.19 g Ca3(PO4)2

So x grams Ca will be required to produce 50.500 grams Ca3(PO4)2

x grams Ca will be equal

The grams of calcium required to produce 50.500 g of calcium phosphate = 19.6 grams

Zero on the Kelvin scale corresponds to absolute zero this statements about temperature scales is correct

Using a beginning point (0 or zero) and a unit of measurement, a temperature scale can be used to indicate or measure temperature. This is typically accomplished by designating certain physical events as occurring at 0 and 100 degrees Fahrenheit, respectively, at specific temperatures, such as the freezing and boiling points of water.

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By using an appropriate conversion factor, the size of this popular car's engine is equal to 356.78 cubic inches.

A conversion factor simply refers to a number that is typically used to convert a number in one (1) set of units to another, either by dividing or multiplying.

Generally speaking, an appropriate conversion factor to an equal value must be used when it is necessary to perform any mathematical conversion.

Conversion:

1 cubic centimeter = 0.061023744094732 cubic inches.

5,840 cubic centimeter = X cubic inches.

Cross-multiplying, we have:

X = 0.061023744094732 × 5,840

X = 356.78 cubic inches.

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Complete Question:

A popular car has an engine that is reported to have a volume of 5840 cm³. What is the size in cubic inches?

Answer: CHOCH

The third one

Explanation:

The energy and frequency of the red light would be  2.88 × 10⁻¹⁹ Joules and 4.615 × 10¹⁴ Hz respectively if the red light has a wavelength of 650

nm.

It can be understood in terms of the distance between any two similar successive points across any wave for example wavelength can be calculated by measuring the distance between any two successive crests.

C = λν

As given in the problem we have to calculate the energy of the light if the wavelength of light is 6.5 × 10⁻⁷ meters.

The frequency of the red  light = 3 × 10⁸ / 6.5 × 10⁻⁷

                                                    = 4.615 × 10¹⁴ Hz

The energy of the red light = h ν

                                             = 6.26 × 10⁻³⁴ × 4.615 × 10¹⁴

                                             = 2.88 × 10⁻¹⁹ Joules

Thus, the energy and frequency of the red light would be  2.88 × 10⁻¹⁹ Joules and 4.615 × 10¹⁴ Hz respectively.

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Answer:

Chemistry - States of matter - Kinetic Molecular Theory

This is the theory that explains the states of the matter and is based on the idea that matter is composed of tiny particles that are always on motion.

Part 1: Check all the statements that apply to the behavior of an ideal gas

The behaviors that apply are:

1.Gas paarticles behave like hard sphares.

2.Gas particles travel randomly.

5. Average kinetic energy of a collection of gas particles depends on the temperature.

Part 2: According to kinetic-molecular theory the one that would not be considered an ideal gas is:

A gas with highly polar molecules that have very strong intermolecular forces.

This is because the theory consideres thhat there are no forces of attraction of repultion between gas particles.

To count atoms, we can find the total sum of the subscripts in a chemical compound.

This is the case for most compounds. In some cases, we will have to multiply subscripts when there are elements inside brackets.

We're given:

Li₂SO₂

In front of lithium (Li), there is a 2.

In front of sulfur (S), there is nothing, which means 1.

In front of oxygen (O), there is a 2.

Add:

2 + 1 + 2 = 5

Therefore, there are 5 atoms in Li₂SO₂.

5 atoms

Except for NACLE, the is made up of ionic compounds. Carbon disulfide bonds are not ionic due to their weak and trivial polarity. Carbon disulfide bonds are covalent due to the small difference in electronegativities of carbon and sulfur.

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Alkali Metals are located in the first group in the periodic table. (Hydrogen is not alkali, be careful with that).

Alkaline Earth Metals are in group number two, right next to the Alkali Metals.

You have to look at the vertical groups ( 1 and 2).

----------------------------------------------------------------------------------------------------------------

ALKALI METALS (AL) VS ALKALINE EARTH METALS (ALE).

Alkali Metals are soft, Alkaline Earth Metals are hard.

AL have only one electron in the last shell, ALE have 2.

AL present a low melting point, ALE high.

AL form hydroxides strongly basic, ALE hydroxides are less basic.

AL are more reactive than ALE

AL have +1 ionic charge in their compounds, ALE have +2 ionic charge in their compounds.

Answer

NO is the limiting reactant

Explanation

Given that:

The mass of NH3 that reacted = 43.4 g

The mass of NO that reacted = 30 g

The equation for the reaction is: 4NH3 + 6NO --> 5N2 + 6H2O

What to find:

The limiting reactant.

Step-by-step solution:

The first step is to convert the given mass of the reactants to moles.

Using the mole formula and the molar masses of (NH3 = 17.0 g/mol and NO = 30.0 g/mol)

The final step is to determine the limiting reactant by comparing the mole ratio from the given equation with the mole ratio in the step above.

From the equation, 4 moles of NH3 reacted with 6 moles of NO

So 2.55 moles of NH3 is expected to react with (2.55 x 6)/4 = 3.825 moles of NO

1.0 mol NO is less than 3.825 mol NO, hence, NO is the limiting reactant because it will be the reactant to be completely used up first.

Answer:

m = 506 grams of fluorine

Explanation:

Given:

M = 19·10⁻³ kg / mol - molar mass of fluorine

V = 543.2 mL = 543.2·10⁻³ m³

p = 123456 Pa

t = 29.8°C

_____________________

m - ?

Temperature in degrees Kelvin:

T = 273.15 + t = 273.15 + 29.8 =  302.95 K

Clapeyron-Mendeleev law:

p·V = (m/M)·R·T

Mass of fluorine:

m = p·V·M / (R·T)

m = 123456·543.2·10⁻³·19·10⁻³ / (8,31·302.95) ≈ 0.506 kg  

or m = 506 g

Answer:

The difference between chemical and physical equilibrium. Physical is a reversible change of state. Chemical is a reversible chemical reaction that can go in the direction to create products or to create reactants.

A physical equilibrium is an equilibrium state in which the physical state of the system does not change. Chemical equilibrium is the equilibrium state in which the concentrations of reactants and products is not changed with time.

Hope this helps!

To determine what type of bond is formed when hydrogen and oxygen form water, we have to find the difference in electronegativities of hydrogen and oxygen:

According to this, the difference between electronegativities is less than 1.7 and greater than 0.4, which means that the type of bond formed by oxygen and hydrogen is polar covalent bond.

Because tri means 3, there are 3 silicon atoms, and tetra means 4, so there will be 4 nitrogen atoms, the answer is:

The difference between ionization and dissociation : Ionization breaks ionic bonds, and dissociation breaks covalent bonds.

Ionization breaks the ionic bond into its constituent ions while dissociation is breaking of bond into its simple constituent. Ionization is a irreversible process and dissociation is reversible process. The bond involves in the process of ionization is ionic bond and the bond involved in the process of dissociation is the covalent bond. The compound related to ionization is ionic compound and the compounds related with dissociation is covalent compound.

Thus, The difference between ionization and dissociation :

(A) Ionization breaks ionic bonds, and dissociation breaks covalent bonds.

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Answer: valeraldehyde

Explanation:

I had to memorize this one

The functional group present is aldehyde and name of compound is valeraldehyde.

Functional group is defined as a substituent or group of toms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.

The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.

Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.

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If 1.53 g of copper is heated with excess sulfur to yield 1.76 g of copper (I) sulfide, the percent yield would be  75.43%.

The percent yield of a reaction is the actual yield relative to the theoretical yield of the same reaction.

The percent yield of a reaction is mathematically expressed as:

Percent yield = actual yield/theoretical yield x 100%.

Let us now consider the reaction in question. The equation of the reaction is given as:

[tex]Cu + S --- > CuS[/tex]

The mole ratio of the copper that reacts to the copper sulfide that is formed is 1:1.

Recall that: mole = mass/molar mass

The molar weight of copper is 63.55 g/mol

Mole of 1.53 g copper = 1.53/63.55

                           = 0.024 moles

The equivalent mole of copper sulfide produced will also be 0.024 moles.

The molar mass of CuS is 95.61 g/mol

Mass of 0.024 moles CuS = 0.024 x 96.61

                                      = 2.32 g

2.32 g is the theoretical yield of the reaction. But 1.76 g of copper sulfide is the actual yield.

Percent yield = 1.75/2.32 x 100%

                      = 75.43%

Thus, the percent yield of the reaction, if 1.53 g of copper is heated with excess sulfur to produce 1.76 g of copper (I) sulfide, is 75.43%.

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Write the balanced chemical equation for the reaction as follows:

Given:

Concentration of sodium hydroxide =1.50 mol/L

Volume of sodium hydroxide = 20 mL

Concentration of sulfuric acid = x

Volume of sulfuric acid = 20 mL

Firstly, we will determine the moles that is in 20 mL of 1.5 M NaOH:

Based on the balanced chemical equation and the moles of NaOH we can use stoichiometry (ratios) to determine the moles of 20 mL sulfuric acid:

Now that we know how many moles are in 20 mL of H2SO4, we can determine the moles in 1000mL (initial concentration):

Answer: D) 0.75 mol/L,

LiOH ⇌ Li +  + OH - NR

When there are too many OH ions, water dissociates fully to the left, possibly leaving only Li + and OH ions and H 2 O molecules.

An atom or collection of atoms that is classified as an ion as a different number of electrons than proton atoms. The particle is a positive ion, also known as a cation, if the number of electrons is smaller than the number of protons.

Ions are created when there are more protons in an atom than electrons, which is the case in all atoms. An atom that has gained or lost one or more electrons, and as a result has a negative or positive charge, is what is referred to as an ion. Exchanging electrons between atoms or molecules is the process of ionization.

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Answer:

100ml x 0.774

divide by 4

x by 8

In order to solve this question, we can use the electronegativity table (or also just a regular periodic table), which will give us the values of electronegativity for each element.

As we can see in this table, the least electronegative element will be Al, with only 1.61 of value. If you were with a regular periodic table, you could find this answer by thinking about the periodic table trend, or we can also call it a rule, that in most elements the electronegativity will grow in value from left to right and from the bottom to the top, then you would also get Al as your answer

Answer = Al, letter D

Answer:

It was started by the FBI

The PV work formula is:

w = -Pexternal * ΔV

w = -44.0 atm * (89.0 - 90.0)

w = -44.0 atm * -1 L

w = 44.0 L atm

For each L atm, we will have 101.325 Joules, therefore

44.0 L atm * 101.325 J

w = 4458.3 J or 4.4 kJ