6. What is the total number of valence electrons in an
atom of germanium in the ground state?

Answer:

1 - Gravitational.

2 - Normal

3 - Tension

4 - Frictional

5 - Centripetal

Explanation:

1. If you drop something, gravity pulls it down to the Earth, So falling towards the earth is gravity.

2. Pushing back on another object is normal, Newton's law: Every action has an equal and opposite reaction.

3. When two forces are pulled on opposite sides, the object must stretch which creates tension. Think of a rubber band. If it is pulled more than the object can stretch, it will tear. Tensile strength refers to how much pulling force an object can withstand before it tears.

4. When objects or molecules rub against other objects or molecules they create friction.

5. Last two options go together.

Less cropland is lost impact is associated with sustainable agriculture

Agriculture is the arena's biggest industry. It employs multiple billion humans and generates over $1.three trillion bucks really well worth of meals annually. Pasture and cropland occupy round 50 percentage of the Earth’s liveable land and offer habitat and meals for a large number of species..

When agricultural operations are sustainably managed, they could keep and repair crucial habitats, assist defend watersheds, and enhance soil fitness and water quality. But unsustainable practices have severe influences on humans and the environment.

The want for sustainable useful resource control is more and more more urgent. Demand for agricultural commodities is growing hastily as the arena's populace grows. Agriculture’s deep connections to the arena economy, human societies and biodiversity make it one of the maximum essential frontiers for conservation across the globe.

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Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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Answer : The concentration of the HCl in original bottle is 0.56 M.

Explanation :

According to neutralization law:

\(M_1V_1=M_2V_2\)

where,

\(M_1\) = concentration of  HCl

\(M_2\) = concentration of NaOH

\(V_1\) = volume of HCl

\(V_2\) = volume of NaOH

Given:

\(M_1\) = ?

\(M_2\) = 0.25 M

\(V_1\) = 10 mL

\(V_2\) = 22.4 mL

Now put all the given values in the above formula, we get:

\(M_1\times 10mL=0.25M\times 22.4mL\)

\(M_1=0.56M\)

Therefore, the concentration of the HCl in original bottle is 0.56 M.

The largest effect on the population of trout in Wisconsin was caused by the introduction of non-native species into the ecosystem.

The introduction of non-native species into an ecosystem can cause a disruption in the food chain, leading to a decrease in the population of native species. In Wisconsin, the introduction of non-native species such as the brown trout and rainbow trout has had a significant impact on the population of native brook trout.

The non-native species compete with the native brook trout for food and habitat, which has led to a decrease in the brook trout population. This highlights the importance of preserving the natural balance of ecosystems and avoiding the introduction of non-native species.

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Answer:

Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. Hope it helps ;)

Answer:

B.

Explanation:

Because when a pistol is fired, chemical changes happen to light the gunpowder or whatever substance to create the noise or effect.

The volume of the solution is 39.6 mL. Solutions can be formed by dissolving solids, liquids, or gases in a liquid solvent or by dissolving gases in a solid solvent.

What is Solution?

A solution is a homogeneous mixture of two or more substances in which the components are uniformly distributed on a molecular or ionic level. In a solution, the substance that is present in the largest amount is called the solvent, and the substance that is present in smaller amounts is called the solute.

We can use the following formula to calculate the volume of the solution:

Molarity (M) = moles of solute (n) / volume of solution in liters (V)

First, we need to calculate the number of moles of Cu(NO3)2:

mass of Cu(NO3)2 = 6.25 g

molar mass of Cu(NO3)2 = 187.56 g/mol (63.55 g/mol for Cu + 2x14.01 g/mol for N + 6x16.00 g/mol for O)

moles of Cu(NO3)2 = mass / molar mass = 6.25 g / 187.56 g/mol = 0.0333 mol

Next, we can rearrange the formula to solve for the volume of the solution:

V = n / M

V = 0.0333 mol / 0.840 M = 0.0396 L

Finally, we convert the volume to milliliters:

V = 0.0396 L x 1000 mL/L = 39.6 mL

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Answer:

In this reaction, Ca(OH)2 is a reducing agent. It reacts with hydrogen chloride to form calcium chloride and water. Therefore, the following reaction shows that matter is neither created nor destroyed in a chemical reaction: Ca(OH)2 + 2HCI -> CaCl2 + 2H20. The formation of calcium chloride and water from the hydrolysis of calcium hydroxide is not an example of matter being created or destroyed in a chemical reaction because it does not involve the breaking down of any bonds between atoms.

Explanation:

Answer:

lithium 1+

magnesium 2+

aluminum 3+

chloride 1-

oxygen 2-

nitrogen 3-

hope this helps!

Explanation:

for plato users :)

The ionic charges for the given elements are Lithium (Li) + 1, Magnesium (Mg) + 2, Aluminum (Al) +3, Chlorine (Cl)  -1, Oxygen (O) -2, and Nitrogen (N) -3.

The ionic charge can be defined as the oxidation state of the chemical species. The cation carries a positive charge while Anion carries a negative charge. The number of electrons in ions present depends on the charge carried by ions.

In the periodic table, the elements from the left side are electropositive and act as metals.  The metals can donate one or more electrons thus they carry a positive charge on them.

In the periodic table, the elements from the right side are electronegative and act as non-metals. The non-metals can accept one or more electrons thus they carry a negative charge on their ions.

Lithium (Li), magnesium (Mg), and aluminum (Al) donate electrons in their valence shell and carry + 1, +2, and +3 ionic charge respectively. Chlorine (Cl), oxygen (O), and nitrogen (N) accept electrons in their valence shell and carry - 1, -2, and -3 ionic charge respectively.

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Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the  pH of a 0.01 M acetic acid.

Any hydrogen that comprises a material capable of giving a proton (a hydrogen ion) to another chemical is defined as acid. A base is indeed a molecule or ion that can receive a hydronium ion from just an acid.

1)Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. The pH value of stronger acid is lower.

2)CH\(_3\)COOH + H\(_2\)O  ⇄ CH\(_3\)COO⁻+  H\(_3\)O⁺

 0.01             0               0

 -x              +x                +x

 0.01-x           +x        +x

Ka=[ CH\(_3\)COO⁻][H\(_3\)O⁺]/[CH\(_3\)COOH]

1.8×10⁻⁵ = [x][x ]/[  0.01-x ]

x=1.34×10⁻³

pH = -log[H⁺]

     =  -log[1.34×10⁻³]

     =2.88

Therefore, because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the   pH of a 0.01 M acetic acid.

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Answer: 43 points my bad Cuh I have to get the points

Explanation: :)

Answer:

C. polar covalent: electrons shared between sulfur and oxygen but attracted more to the sulfur

Explanation:

Sulfur dioxide is a polar covalent compound. Since oxygen has higher electronegativity, the shared pair of electrons are attracted towards oxygen. Hence, D is correct.

A covalent bond is formed between two atoms when they share electrons each other. Sulfur and oxygen are 16th group elements. Both have a valency of two. And shares two electrons each to form double bond.

Electronegativity is the ability of an atomic nucleus to attract the bonded pair electrons When the bonded atoms have significant difference in their electronegativities, the shared pair of electrons attracts towards the more electronegative atom.

The more electron density on one atom and less on other atom make them partially charged and possess a permanent dipole moment making the compound polar.

In SO₂, the shared electrons are attracted towards oxygen which makes the compound polar. Hence, option D is correct.

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Answer:

The composition of the objects because not all the planets have been explored

Answer:

: kinetic energy is the energy transformation that occurs in a hot balloon.

Explanation:

Hot air balloons use a propane burner that converts chemical energy to thermal energy. The hot air is less dense than than the colder air and it lifts the balloon

Atom consists of electron, proton and neutron.  The number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.

Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.

Mass number =Number of neutrons+ number of protons

Mass number =55

Number of neutrons=atomic number+5

Substituting the given values in the above formula

55 =atomic number+5+ number of protons

50=2×atomic number

Atomic number=25

Therefore, the number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.

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Answer:

See Explanation

Explanation:

Given

(a) to (d)

Required

Determine whether the given parameters can calculate the required parameter

To calculate either Density, Mass or Volume, we have

\(Density = \frac{Mass}{Volume}\)

\(Mass = Density * Volume\)

\(Volume = \frac{Mass}{Density}\)

(a) 432 g of table salt occupies 20.0 cm^3 of space

Here, we have:

\(Mass = 432g\)

\(Volume = 20.0cm^3\)

The above can be used to calculate Density as follows;

\(Density = \frac{Mass}{Volume}\)

\(Density = \frac{432g}{20.0cm^3}\)

\(Density = 21.6g/cm^3\)

(b) 5.00 g of balsa wood, density of balsa wood : 0.16 g/cm^3

Here, we have:

\(Mass = 5.00g\)

\(Density = 0.16g/cm^3\)

This can be used to solve for Volume as follows:

\(Volume = \frac{Mass}{Density}\)

\(Volume = \frac{5.00g}{0.16g/cm^3}\)

\(Volume = 31.25cm^3\)

(c) 32 cm^3 sample of gold density of 19.3 g/cm^3

Here, we have:

\(Volume = 32cm^3\)

\(Density = 19.3g/cm^3\)

This can be used to calculate Mass as follows:

\(Mass = Density * Volume\)

\(Mass = 32cm^3 * 19.3g/cm^3\)

\(Mass = 617.6g\)

(d) 150 g of iron, density of Iron = 79.0 g/cm^3

Here, we have

\(Mass = 150g\)

\(Density = 79.0g/cm^3\)

This can be used to calculate volume as follows:

\(Volume = \frac{Mass}{Density}\)

\(Volume = \frac{150g}{79.0g/cm^3}\)

\(Volume = 1.90 cm^3\) Approximated

Answer:

n = 0.21 moles

Explanation:

Given that,

Volume, V = 0.84 L

Pressure, P = 4.6 atm

T = 222 K

We need to find the number of moles of Neon gas. We know that,

PV = nRT

Where

n is the number of moles

R i the gas constant, R = 0.08206 L-atm/mol-K

Put all the values,

\(n=\dfrac{PV}{RT}\\\\n=\dfrac{4.6\times 0.84}{0.08206 \times 222}\\\\n=0.21\ \text{moles}\)

So, there are 0.21 moles of Neon gas.

Answer:

2 Mg(NO3)2 → 2 MgO + 4 NO2 + O2.

Mg(OH)2=MgO + H2O.

hope. it helps

Answer:

it is cylinder as it has two bases but no lateral faces.

Answer:

Refer to the attachments!!

Explanation:

the pH at the neutralization point is:  \(pH = -log[H3O^+] = -log(1.68 \times 10^-4) = 3.77\)

To determine the pH at the neutralization point, we first need to calculate the moles of   \(NaOH\) used to neutralize the acetic acid:

moles of   \(CH3COOH =\) (volume in liters) x (concentration in mol/L) = \((25/1000) x 10 = 0.25 mmol\)

moles of  \(NaOH =\) (concentration in mol/L) x (volume in liters)  \(= 0.050 x\)(volume in liters)

At the neutralization point, the moles of   \(NaOH\) will be equal to the moles of  \(CH3COOH\) :

\(0.25 mmol = 0.050 \times\) (volume in liters)

volume in liters \(= 5 mL\)

So, it takes \(5 mL\) of  \(0.050 M NaOH\) to neutralize \(25 mL\) of 0.10 M \(CH_3COOH.\)

Now, we need to calculate the concentration of  \(CH3COOH\) and  \(CH3COO-\)(acetate ion) in the solution after the addition of 5 mL of NaOH:

moles of CH3COOH remaining = moles of \(CH_3COOH\) initially - moles of NaOH added

\(= 0.25 mmol - 0.050 mmol = 0.20 mmol\)

volume of final solution \(= 25 mL + 5 mL = 30 mL\)

concentration of  \(CH_3COOH =\) (moles of \(CH_3COOH\) remaining) / (volume in liters) \(= 0.20 mmol / 0.030 L = 6.67 mM\)

concentration of CH3COO- = (moles of NaOH added) / (volume in liters) \(= 0.050 mmol / 0.030 L = 1.67 mM\)

Next, we can use the equilibrium expression for the dissociation of acetic acid to calculate the pH:

\(CH3COOH + H2O \rightleftharpoons CH3COO- + H3O+\)

\(Ka = [CH3COO-][H3O+] / [CH3COOH]\)

At the neutralization point, \([CH3COOH] = [CH3COO-] = 0.5 \times 6.67 mM = 3.33 mM\)

\(Ka = 1.8 x 10^-5\)

Solving for \([H3O^+]\), we get:

\([H3O+] = \sqrt (Ka x [CH3COOH]) = \sqrt (1.8 \times 10^-5 \times 3.33 \times 10^-3) = 1.68 \times 10^-4 M\)

Therefore, the pH at the neutralization point is:  \(pH = -log[H3O^+] = -log(1.68 \times 10^-4) = 3.77\)

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Answer:

76.875 cm3

Since: Density = \(\frac{Mass}{volume\\}\)

Then: Volume = \(\frac{Mass}{Density\\}\)

The mass of the box = 246g

and the density = 3.2 g/cm3

Then: The volume = \(\frac{246}{3.2}\)

= 76.875 cm3

The degree of association of AlCl3 into Al2Cl6 is 0.663. The degree of association of AlCl3 into Al2Cl6 can be determined using the ideal gas law and the van't Hoff factor.

Firstly, we need to calculate the number of moles of AlCl3 present in the vessel using the formula n = m/M, where m is the mass of AlCl3 and M is the molar mass of AlCl3.

n = 10.32g / 133.34 g/mol = 0.0774 mol

Next, we can use the ideal gas law equation PV = nRT to calculate the number of moles of particles in the gas phase. Rearranging this equation, we get:

n = PV/RT

where P is the pressure, V is the volume, R is the gas constant and T is the temperature in Kelvin.

n = (1.7 x 10 N/m²) x 1 dm³ / (8.31 J/mol/K x 353 K) = 7.55 x 10⁻⁴ mol

The van't Hoff factor (i) is the ratio of the actual number of particles in solution to the number of formula units dissolved. For a completely dissociated compound, the van't Hoff factor is equal to the number of ions produced. In the case of AlCl3, it undergoes a degree of association to form Al2Cl6, so the van't Hoff factor is less than 1.

We can now use the formula i = 1 + (α - 1)β, where α is the degree of association and β is the number of particles in solution per formula unit. For AlCl3, β = 4 (AlCl3 contains one Al and three Cl atoms), and assuming a degree of association of x, we get:

i = 1 + (x - 1) x 4 = 4x - 3

Substituting the values for n and i into the equation n = iC, where C is the concentration in mol/dm³, we get:

7.55 x 10^-4 mol = (4x - 3) C

Solving for x, we get:

x = 0.663

Therefore, the degree of association of AlCl3 into Al2Cl6 is 0.663.

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Answer: you can't really balance it doesn't make anything

Explanation:

Answer:

D

Explanation:

A growing body of scientific evidence shows that the felling of tropical forests creates optimal conditions for the spread of mosquito-borne scourges, including malaria and dengue. Primates and other animals are also spreading disease from cleared forests to people.

Answer:

different from ionic or covalent bonding

Explanation: