I really need help I'm not good with science

Answer:

a) the tendency to form hard, brittle crystals.

Explanation:

Metallic bonding occurs between metals; metals are excellent conductors of electricity, are malleable (can be hammered into thin sheets) and have luster (are shiny). Brittleness is indicative of an ionic bond or ionic compound.

Correct option is c. 0

Let's discuss it further below.

In the Lewis structure for formaldehyde (H2CO), where C is the central atom, the formal charge on C is:

Step 1: Determine the number of valence electrons for C. Carbon has 4 valence electrons.
Step 2: Calculate the number of electrons assigned to C in the Lewis structure. In formaldehyde, C is bonded to 2 H atoms (each with 1 bond) and 1 O atom (with a double bond). This gives C a total of 4 bonds, so it has 4 assigned electrons.
Step 3: Calculate the formal charge on C using the formula: Formal Charge = (Valence Electrons) - (Assigned Electrons). Thus, Formal Charge on C = (4) - (4) = 0.

So, the formal charge on C in the Lewis structure for formaldehyde is 0 (option c).

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presence of heat can change solid tu liquid

and liquid to gas

The number of moles of solute is 0.264 moles.

The concentration of a solution can be determined by calculating the number of moles of solute present in a given volume. The concentration of a glucose solution given is 0.750 m, which means that there are 0.750 moles of glucose present in 1 liter of the solution.

To calculate the number of moles of solute present in 352 ml of this solution, we must first convert 352 ml to liters. This is done by dividing 352 by 1000, giving 0.352 liters.

To calculate the number of moles of glucose in this volume of solution, we must multiply 0.750 moles by 0.352 liters, giving 0.264 moles.

This means that in a volume of 352 ml of a solution with a concentration of 0.750 m, there are 0.264 moles of glucose present.

Therefore, the number of moles of solute present in a volume of 352 ml of glucose solution is 0.264 moles.

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Answer:

Is this the full question?

Answer:

0.125L or 125 mL

Explanation:

0.125L of 3.00M KI stock solution is required to make 0.300 L of a 1.25M KI solution.

A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.

A stock solution is a concentrated solution that will be diluted to a solution of lower concentration.

stock solution = diluted solution

Where, M1 = concentration in molarity (moles/Litres) of the   concentrated solution

V2 = volume of the concentrated solution,

M2 = concentration in molarity of the dilute solution

V2 = volume of the dilute solution.                                

The volume of 3.00M KI solution can be calculated using the dilution equation:

Given:

M1 = 3.00M, M2 = 1.25M, V1 = x, V2 = 0.300L

M1V1 = M2V2

3.00M(x) = 1.25M(0.300L)

           x = 0.125L

Hence, 0.125L of 3.00M KI stock solution is required to make 0.300 L of a 1.25M KI solution.

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Answer: A. protons in the atom

Explanation: I just took the test and got a 100% so this should be right. Unless the question is worded differently than mine then it should be right. Hope this helps :)

Answer:

A

Explanation:

Answer:

The hydronium ion concentration increases to 100 times the original concentration

Explanation:

The pH of a solution is defined as the negative logarithm of the hydrogen or hydronium ion concentration of that solution. It is given by the expression below:

pH = -log[H₃O⁺] = log[H₃O⁺]⁻¹

Assuming the solution was at neutral with original pH = 7;

The new pH of the solution will be = 7 - 2 = 5

At pH = 7;

log[H₃O⁺]⁻¹ = 7

[H₃O⁺]⁻¹ = 10⁷

[H₃O⁺] = 10⁻⁷

At pH = 5

log[H₃O⁺]⁻¹ = 5

[H₃O⁺]⁻¹ = 10⁵

[H₃O⁺] = 10⁻⁵

10⁻⁵ = 10⁻⁷ * 10²

But 10² = 100

Therefore, the hydronium ion concentration increases to 100 times the original concentration

Answer:

B

Explanation:

On Edge

Answer:

One mole of calcium is present in one mole of calcium carbonate

Explanation:

Because its formula is CaCO3

Ca contains 2+ charge and CO3 contains 2- charge

The reaction would tend to proceed in the reverse direction, resulting in an increase in the concentrations of \(SO_2\) and \(O_2\), and a decrease in the concentration of \(SO_3\), until equilibrium is reached.

The reaction between sulfur dioxide (\(SO_2\)) and oxygen (\(O_2\)) to form sulfur trioxide (\(SO_3\)) is an exothermic reaction. According to Le Chatelier's principle, at high temperatures the equilibrium position of an exothermic reaction shifts towards the reactants side. Therefore, the reaction would tend to proceed in the reverse direction.

The balanced chemical equation for the reaction is:

\(2SO_2(g) + O_2(g) = 2SO_3(g)\)

The initial moles of the reactants are:

n(\(SO_2\)) = 0.200 mol

n(\(O_2\)) = 0.300 mol

n(\(SO_3\)) = 0.500 mol

To determine the reaction quotient Q, we divide the product of the concentrations of the products (raised to their stoichiometric coefficients) by the product of the concentrations of the reactants (raised to their stoichiometric coefficients):

\(Q = [SO_3]^2 / ([SO_2]^2 * [O_2])\)

Substituting the initial concentrations into the expression for Q:

Q = (0.500 mol/dm^3)^2 / ((0.200 mol/dm^3)^2 x (0.300 mol/dm^3))

Q = 20.83

The reaction quotient Q is greater than the equilibrium constant Kc at 1000K for this reaction, which is around 1. Hence, the reaction is not at equilibrium and will shift in the reverse direction to reduce Q. This means that some of the sulfur trioxide will react to produce sulfur dioxide and oxygen.

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The acid in a conjugate acid-base pair is typically comprised with the proton.

The conjugate acid-base pair is given with the Brønsted Lowry concept of acid and base in which with a compound can act as acid and base with the addition of a proton, or with the removal of a proton respectively.

Thus, in a conjugate pair of acid and base, an acid is typically comprising the proton.

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Answer:

Membrane

Explanation:

Unlike a bacteria , an animal cell contains membrane which bounds organelles.

Answer:

The short general principle of solubility states that "like dissolves like." Solvents that have similar polarity or charge to the solute tend to dissolve it more readily.

Solubility is the ability of a substance to dissolve based on chemical nature, intermolecular forces, and "like dissolves like" principle. Factors like particle size, temperature, and pressure affect solubility. It is expressed as the maximum amount of solute that can dissolve in a solvent.

The density of the rectangular block in g/mL is 7.0.

Given the following data:

To find the density of the block in g/mL:

First of all, we would determine the volume of the rectangular block by using the following formula:

\(Volume = length\) × \(width\) × \(height\)

Conversion:

1 in = 2.54 cm​

5.83 in = X cm

Cross-multiplying, we have:

\(X = 2.54(5.83)\\\\X = 14.81 \; cm\)

\(Volume = 3.21\) × \(5.83\) × \(14.81\)

Volume = 277.16 cubic centimeters.

Note: Milliliter (mL) is the same as cubic centimeters.

1000 grams = 1 kg

Y grams = 1.94 kg

Cross-multiplying, we have:

Y = 1940 grams

Now, we can find the density:

\(Density = \frac{Mass}{Volume}\\\\Density = \frac{1940}{277.16}\)

Density = 7.0 g/mL

Therefore, the density of the rectangular block in g/mL is 7.0.

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One difference between an electrolytic cell and a galvanic cell is that the reaction in a galvanic cell is spontaneous, while the reaction in an electrolytic cell is non-spontaneous.

Electrolytic and galvanic cells are two types of electrochemical cells used in various applications. In a galvanic cell, the redox reaction is spontaneous, meaning that it occurs without any external source of energy. The reaction generates a potential difference between the electrodes, and electrons flow from the anode to the cathode through the external circuit. This flow of electrons produces an electric current that can be used to do work.

In contrast, an electrolytic cell is a non-spontaneous electrochemical cell that requires an external source of energy to drive the redox reaction. The external source of energy can be a battery or other power source. The reaction in an electrolytic cell is driven in the opposite direction of a spontaneous reaction, meaning that the anode becomes the positive electrode and the cathode becomes the negative electrode. The flow of electrons is also in the opposite direction compared to a galvanic cell, with electrons flowing from the cathode to the anode. Additionally, electrolytic cells often require the use of inert electrodes, such as platinum or graphite, to prevent unwanted reactions from occurring at the electrode surface.

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Answer:

It emits hydrogen sulfide...smells like rotten eggs..

ty:)pls let me know whether this is ryt:D

Answer:

Hey!

Your answer is that it creates hydrogen sulfide gas / liquid...

Which really smells...

Explanation:

HOPE THIS HELPS!

Answer:

Double replacement reaction

Explanation:

This is what is known as a double replacement reaction. The two parts of each molecule separate and recombine to form two new compounds. For instance, \(Al_2(SiO_3)_3\) separates into \(Al_2\) and \((SiO_3)_3\), while \(NaOH\) separates into \(Na\) and \(OH\), and then they recombine with the other compound.

Hope this helps!

Answer:

double replacment reaction

Explanation:

srry if it is wrong

Answer:

When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. ... Solids, liquids and gases all expand when heat is added.\

so hope that helps and sooooo

Answer:

When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. ... Solids, liquids and gases all expand when heat is added.

Answer:

true

Explanation:

true

Answer:

Saturated solution = 180 gram

Explanation:

Given:

Solubility of Z = 60 g / 100 g water

Given temperature =  20°C

Amount of water = 300 grams

Find:

Saturated solution

Computation:

Saturated solution = [Solubility of Z] × Amount of water

Saturated solution = [60 g / 100 g] × 300 grams

Saturated solution = [0.6] × 300 grams

Saturated solution = 180 gram

The intermolecular forces that act between a fluorine molecule (F2) and a methane molecule (CH4) are van der Waals forces.

Van der Waals forces are weak intermolecular forces that exist between all molecules, including non-polar molecules like F2 and CH4. The two types of van der Waals forces are London dispersion forces and dipole-dipole forces.

In the case of F2 and CH4, there are no permanent dipoles since both molecules are non-polar. However, the electrons in both molecules are in constant motion, creating temporary dipoles that induce opposite charges in neighboring molecules. This creates a weak attractive force between the molecules known as London dispersion forces.

Therefore, the only intermolecular forces that act between a fluorine molecule and a methane molecule are London dispersion forces.

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Answer:

n = 0.13 moles of C2H6

grams = 11 g of CO2

Explanation:

Explanation:

after the food leaves the stomach it enters the small intestine

Answer:

after the food leaves the stomach it enters the small intestine

Explanation:

The complete sentences are:

Page 3:

The effect of energy in phase transitions of matter is that it is required to break the intermolecular forces that hold the particles of a substance together. When energy is added to a substance, the particles move faster and the intermolecular forces are broken. This can cause the substance to change phase.

The interactive demonstration on the sample of water shows that energy is required to melt ice and boil water. When the ice is heated, the particles start to move faster and the ice melts. The temperature of the water stays constant at 0°C until all of the ice has melted. This is because the energy is being used to break the intermolecular forces in the ice. Once all of the ice has melted, the temperature of the water starts to rise again. When the water is boiled, the particles move so fast that they escape from the liquid state and become a gas. The temperature of the water stays constant at 100°C until all of the water has boiled. This is because the energy is being used to break the intermolecular forces in the water. Once all of the water has boiled, the temperature of the steam starts to rise again.

The complete sentences:

Page 4:

Heating curves show the temperature of a substance as it is heated. The curve has a horizontal line at the melting and boiling points, which indicates that the temperature does not change during these phase changes.

Cooling curves show the temperature of a substance as it is cooled. The curve has a horizontal line at the melting and boiling points, which indicates that the temperature does not change during these phase changes.

Both curves show that the temperature of a substance increases as it is heated and decreases as it is cooled.

A heating curve is more choppy than a cooling curve because there are more phase changes during heating than during cooling.

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Answer:

it reacts to limestone better and is a bit more firmer and mostly preferred over because of how fast it can react towards chemicals

The determine the energy released when 1,000,000 Uranium-235 atoms split, you need to know the energy released per fission event. Here's a step-by-step explanation Determine the energy released per fission event: Uranium-235 undergoes nuclear fission, and when it splits, it releases a certain amount of energy.

The average energy released per fission event for U-235 is approximately 200 MeV (million electron volts). Convert the energy per fission event to joules: 1 electron volt (eV) is equal to 1.602 x 10^ (-19) joules. So, 200 MeV is equivalent to 200 x 10^6 x 1.602 x 10^ (-19) joules, which is approximately 3.204 x 10^(-11) joules. Calculate the total energy released by 1,000,000 U-235 atoms: To find the total energy released by 1,000,000 Uranium-235 atoms, multiply the energy released per fission event (in joules) by the number of atoms. Therefore, 1,000,000 x 3.204 x 10^ (-11) joules = 3.204 x 10^ (-5) joules. So, the energy released when 1,000,000 Uranium-235 atoms split is approximately 3.204 x 10^ (-5) joules.

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Answer:

0.74 atm.

Explanation:

From the question given above, the following data were obtained:

Pressure of Ne (Pₙₑ) = 1.52 atm

Pressure of He (Pₕₑ) = 766 mmHg

Total pressure (Pₜ) = 3.27 atm

Pressure of Ar (Pₐᵣ) =?

Next, we shall convert the pressure of He from mmHg to atm. This can be obtained as follow:

760 mmHg = 1 atm

Therefore,

766 mmHg = 766 mmHg × 1 atm / 760 mmHg

766 mmHg = 1.01 atm

Finally, we shall determine the partial pressure of Ar. This can be obtained as follow:

Pressure of Ne (Pₙₑ) = 1.52 atm

Pressure of He (Pₕₑ) = 1.01 atm

Total pressure (Pₜ) = 3.27 atm

Pressure of Ar (Pₐᵣ) =?

Pₜ = Pₙₑ + Pₕₑ + Pₐᵣ

3.27 = 1.52 + 1.01 + Pₐᵣ

3.27 = 2.53 + Pₐᵣ

Collect like terms

3.27 – 2.53 = Pₐᵣ

Pₐᵣ = 0.74 atm

Thus the partial pressure of Ar is 0.74 atm.

Reactions in which the atoms or ions of two compounds exchange bonding partners are called  double-displacement reaction.

A double displacement response is a sort of chemical reaction wherein two compounds react, and positive ions (cation) and the bad ions (anion) of the two reactants switch locations, forming  new compounds or products.

The response between silver nitrate and sodium chloride is a double displacement reaction. The silver trades its nitrite ion for the sodium's chloride ion, causing the sodium to choose up the nitrate anion.

Double displacement reactions also are referred to as precipitation reactions because they're observed by the formation of a precipitate. An example of a double replacement response is the reaction among silver nitrate and sodium chloride in water. both silver nitrate and sodium chloride are ionic compounds. both reactants dissolve into their ions in aqueous answer.

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The mass of the piece of wood is 35.58 g.

Joule = M × T × C

Where, M = mass

T = change in temperature(42C-23C=19 C)

C = specific heat capacity = 1.716 joules/gram

Substituting the values in the equation,

1160 = M × 19 × 1.716

M = 1160/32.604 = 35.58 g

Therefore, the mass of the piece of wood = 35.58 g

A material's specific heat capacity, which is defined as its heat capacity divided by its mass, determines how much energy is required to increase a gram's temperature by one degree Celsius (or one Kelvin)

Mass is the quantity of matter in a physical body.

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