1. An atom has 6 protons, 6 neutrons, and 6 electrons. What is the charge of the
atom's nucleus?

A.+6
B.+12
C.-6
D.-18

Answer:

See below.

Explanation:

A dynamic equilibrium in chemistry refers to a situation in which the reaction of reactants to form product(s) in which the products can reverse the reaction by falling apart and back to the reactants.  Reactions that go to completion are irreversible.  In cases where reactants form products (in a forward reaction), but the products can change back into reactants (in a reverse reaction) are called reversible.

An example is the reaction of carbon dioxide with water to form carbonic acid (think soft drinks).

     CO2(g)+H2O(l) ⇌ H2CO3(aq)

As anyone who has opened a warm can of soda knows, it can erupt suddenly and spray anyone nearby with a shower of bubbly, and sticky, soda.  Carbonic acid is unstable and will happily decompose back to it's reactant molecules if given the chance.

Experience tells us what to expect when giving a brother or sister a can of warm soda that you've shaken hard for a minute.  But if you are a chemist, such responses aren't always easy to predict with a new reaction.  Equilibrium constants were developed to provide a means for presdicting the exstent of these reactions.  They are used in equilibrium equations to predict the concentrations of products and reactants, given conditions of temperature and pressure, under defined conditions of temperature and pressure.

The equations themselves include concentrations as the key input.  In the carbonic acid example, if one were to add excessive amounts of one of the reactants, one would expect the equilibrium to "shift to the right."  This simply means that more carbonic acid would be made.  The chances of the forward reaction increase as concentration increases.  The amount of CO2 given off as a gas depends on the concentration of the CO2 in the gas phase, which is given by the partial pressure of the gas.

The space above the soda and the cap represents one place that the CO2(g) can escape the solution.  The CO2 pressure in the gas phase is a measure of it's concentration.  An equilbium calculation takes this concentration in account when decidng how much much of each component is present.  Other compouns that are present may also impact the equilibrium since they may interfere with one of the reaction steps.  Pressure and emperature either dirctly impact the concentration (e.g., gases) or they affect the "effective" concentrations of the compunds.  A higher temperature creates more collisons between reactant molucules that may change the equilibrium constant..

Answer:

no ablo inglés porfavor amigos

The mole fraction of ethanol c2h5oh in an aqueous solution that is 46 percent ethanol by mass is 0.25

Mole fraction is the mole of one of the component of the solution divided by the total moles of the solution

Calculating the mole fraction of ethanol,we get

Percentage by weight of ethyl alcohol is 46% which implies in 100 g of this solution is 46 g while the mass of the water will be 54% of 100 g = 54g.

Finding the moles of water and the ethyl alcohol {molar mass of water(H₂O) = 18 and molar mass of ethyl alcohol(C₂H₆O = 46}

Moles = mass/molar mass

moles of ethanol = 46/46 = 1

moles of water = 54/18 = 3

ntotal=1+3=4

Mole fraction of ethanol is:

  Mole of ethanol            =   1/4

   Total mole of solution

Hence, the mole fraction is 1/4 or 0.25

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The chemical equation for the reaction between liquid nonane and gaseous oxygen is: C9H20 (l) + 14 O2 (g) → 9 CO2 (g) + 10 H2O (l)

The phases in the equation are:
- (l) for liquid nonane and liquid water
- (g) for gaseous oxygen and gaseous carbon dioxide.

When liquid nonane (C9H20) reacts with gaseous oxygen (O2) to form gaseous carbon dioxide (CO2) and liquid water (H2O), the balanced chemical equation can be expressed as:

C9H20(l) + 14O2(g) → 9CO2(g) + 10H2O(l)

In this equation, the phases are as follows:
- Liquid nonane (C9H20): liquid (l)
- Oxygen (O2): gas (g)
- Carbon dioxide (CO2): gas (g)
- Water (H2O): liquid (l)

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Answer:

D (32.7%)

Explanation:

Answer:D (32.7%)

Explanation:

The mass of the resulting strontium fluoride precipitate is 2.27m.

What is mass?

mass is quantitative measure of inertia, a fundamental property of all matter.

Sr(NO3)2(aq) +  2NaF(aq) ==> SrF2(s) + 2NaNO3  ...  balanced equation

moles Sr(NO3)2 = 0.180 L x 2.400 mol/L = 0.432 moles

moles NaF = 0.200 L x 3.088 mol/L = 0.6176 moles

NaF is LIMITING REACTANT b/c it takes 2 NaF per 1 Sr(NO3)2 and there isn't enough NaF.

mass of Sr(NO3)2 precipitate = 0.6176 mol NaF x 1 mol SrF2 / 2 mol NaF x 125.6 g SrF2/mol = 38.8 g

Final volume = 180 ml + 200 ml = 380 ml = 0.380 L

[F-] = 0 since all the F- is precipitated as SrF2

[Sr2+] = 0.432 mol - 0.309 mol = 0.123 mol/0.380 L = 0.324 M

[Na+] = 0.6176 moles / 0.380 L = 1.63 M

[NO3-] = 0.432 moles x 2 = 0.864 mol/0.380 L = 2.27 M

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Answer:

20 atoms

Explanation:

There are 4 in H2O2 because of 2 hydrogens and 2 oxygens.

Then, multiply by 5 because the coefficient is 5, therefore there are 5 H2O2 molecules.

5 x 4 = 20

The total number of atoms in the chemical formula 5H₂O₂ is 20.

The term chemical formula is defined as a way of presenting information about the chemical proportions of atoms that represent a particular chemical compound or molecule, applying chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas.

There are three types of chemical formula that are structural, molecular and empirical chemical formula.

There are four atoms in H₂O₂ because of two atoms of hydrogen and two atoms of oxygen. Then, multiply by five because the coefficient is five, therefore there are 5 H₂O₂ molecules.We get,

= 5 x 4

= 20

Thus, The total number of atoms in the chemical formula 5H₂O₂ is 20.

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The pH of the half-way point in the titration of a 0.50 L solution of 0.10 M hydrofluoric acid [HF] with 0.10 M NaOH can be calculated using the Henderson-Hasselbalch equation which is equal to 3.15.

At the half-way point, equal moles of HF and NaOH have reacted, which means that 0.05 moles of HF have reacted with 0.05 moles of NaOH. This leaves 0.05 moles of HF in the solution, which is in equilibrium with its conjugate base, F⁻. The pKa of HF is 3.15, so the Ka can be calculated as 10^(-3.15) = 7.94 × 10^(-4).

The Henderson-Hasselbalch equation is pH = pKa + log([A⁻]/[HA]), where [A⁻] is the concentration of the conjugate base (in this case, F⁻) and [HA] is the concentration of the acid (HF).

At the half-way point, the concentration of HF is 0.05 M and the concentration of F⁻ is also 0.05 M (since they have reacted in a 1:1 ratio). Plugging these values into the equation gives pH = 3.15 + log(0.05/0.05) = 3.15.

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Out of the three solids, Iodine (I2) is expected to have the highest melting point.

This is because the intermolecular forces between iodine molecules are stronger than those between the other two substances, making it more difficult to separate the individual molecules. The stronger the intermolecular forces, the higher the energy required to separate the molecules and the higher the melting point. In comparison, Calcium oxide (CaO) and Krypton (Kr) have weaker intermolecular forces and therefore, lower melting points.

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ANSWER

The mass of water is 0.0536 kg

STEP-BY-STEP EXPLANATION;

Given information

The mass of KNO3 = 175g

The molarity of the solution = 32.25 M

The molality formula is given below as

The first step is to find the mole of the solute using the below formula

Recall, the molar mass of KNO3 is 101.1032 g/mol

The second step is to find the mass of water using the molality formula

Hence, the mass of water is 0.0536 kg

We can use the ideal gas law, that relates the pressure, volume, temperature, and number of moles of a gas and results in 15.5 g of argon gas at a pressure of 1.27 atm and temperature of 361 K occupies volume of 10.8 L.

PV = nRT  where:

P = pressure of the gas in atmospheres (atm)

V = volume of the gas in liters (L)

n = number of moles of the gas

R = ideal gas constant, 0.08206 L.atm/(mol.K)

T = temperature of the gas in Kelvin (K)

First, we need to calculate the number of moles of argon gas present in 15.5 g. We can use the molar mass of argon, which is 39.95 g/mol:

n = m/M = 15.5 g / 39.95 g/mol = 0.388 mol

Next, we can rearrange the ideal gas law to solve for V:

V = nRT/P

Plugging in the given values:

V = (0.388 mol)(0.08206 L.atm/(mol.K))(361 K)/(1.27 atm)

Solving this expression yields:

V = 10.8 L

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Answer:

C + O2 = C02

Explanation:

i believe its deposition

Answer:

Combustion is a rapid exothermic chemical reaction between oxygen, O₂, and a substance which is known as the fuel that is initiated by an ignition (heat) source to produce carbon dioxide and water vapor other oxides and combustion products

With the continuous model, which is the model seen with the naked eye, that have uniform parts, the combustion of coal that produces no flammable vapors and hence no flame, the combustion of hydrogen gas which is nearly colorless and the combustion of gasoline that produces a bright flame, burns without flame will be taken as different processes

Explanation:

The main causes of the Grevy's zebra population decrease are habitat degradation, competition for resources with domestic livestock, and hunting for their skins and meat.

The main factor contributing to the decrease of Grevy's zebras in Ethiopia is hunting. Although their striking skins are the main reason they are hunted, they are also rarely slain for food and, in some areas, for medicinal purposes.

Zebras from Grevy's are in peril. Grevy's zebras have experienced one of the greatest range reductions of any African animal, and are now restricted to northern Kenya and southern and eastern Ethiopia. They are no longer residing in Somalia, Eritrea, Djibouti, and it's possible that they've left Sudan as well.

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The concentrations in mol/dm³ would be 0.002, 0.04, 0.007, and 0.01 respectively.

Since  1 dm³ of blood is taken as containing  1 dm³ of water, it means that the concentration levels are in mg/dm³.

Thus, we are tasked with the job of converting from mg/dm³ to mol/dm³.

Recall that: mole = mass in grams/molar mass in gram/mole

Molar mass of ethanol = 46.07 g/mol

80 mg of ethanol = 0.08 g = 0.08/46.07 = 0.002 mol

200 mg of ethanol = 0.2 g - 0.2/46.07 = 0.004 mol

300 mg = 0.3 g = 0.3/46.07 = 0.007 mol

500 mg = 0.5 g = 0.5/46.07 = 0.01 mol

Therefore, the respective concentrations in mol/dm³ would be 0.002, 0.04, 0.007, and 0.01 respectively.

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Answer:

Copper hydroxide is the correct answer.

Explanation:

Hope this helped Mark BRAINLIEST!!!

Answer:

640 grams

Explanation:

look up Solubility table in wikipedia for potassium nitrate (KNO3)

32 grams of potassium nitrate (KNO3) water solubility at 20 degrees celsius (room temperature) can be dissolved in 100 milliliters (0.1 L) of water.

2 liters = 2000 milliliters

32 grams / 100 milliliters = x grams / 2000 milliliters

cross-multiply

100 * x = 32 * 2000

x = (32 * 2000) / 100

x ≈ 640 grams

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Ammonia volatilization is a concern from both agricultural and environmental perspectives because it results in the loss of valuable nitrogen from the soil, reducing the effectiveness of fertilizers and potentially leading to lower crop yields. Additionally, the release of ammonia gas into the atmosphere contributes to air pollution and can cause harm to the environment.

To reduce or eliminate ammonia volatilization loss from basic soils, four practical steps can be taken:
1. Use alternative forms of nitrogen: Instead of using ammonium-based fertilizers, consider using nitrate (NO3-) or urea-based fertilizers, which are less prone to volatilization.
2. Inject fertilizer deeper into the soil: By placing the fertilizer below the soil surface, you can minimize the contact between ammonium and soil particles, reducing the chances of ammonia volatilization.
3. Raise legume crops: Legumes, such as beans, peas, and clover, have the ability to fix nitrogen from the atmosphere and can help replenish soil nitrogen levels without the need for ammonium-based fertilizers.
4. Acidify the soil: By lowering the soil pH through the application of acidifying agents like sulfur or ammonium sulfate, you can decrease the likelihood of ammonia volatilization. However, be cautious not to over-acidify the soil, as this can negatively impact plant growth.

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Answer:

10 meters per second

Explanation:

: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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Answer: molecules get closer

Explanation:

Condensation is the process in which molecules of a gas slow down, come together, and form a liquid. When gas molecules transfer their energy to something cooler, they slow down and their attractions cause them to bond to become a liquid

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Answer:

D. The molecules get closer together and move more slowly.

Answer:

No oxygen

Explanation:

when something is covered in a blanket it prevents the fire from being able to have any oxygen

Answer:

Its called smothering the fire

Explanation:

A fire needs three things to burn always: fuel, oxygen, and a heat source. Eventually the heat source will not be an issue, but the oxygen and fuel is. If the fire is small enough throwing a blanket can quite smother it. What happens is it cuts off the oxygen supply the fire needs long enough for it to die out.

Answer:

1 Once proteins, fats and carbohydrates are digested, absorption takes place in the small intestine.

2 if we eat food we get energy, but if there weren't chemical reaction in your body nothing happens.

Explanation:

1 Most of the digestion occurs in the first part of the small intestine while the absorption of broken down nutrients, water, vitamins, and minerals occurs in the rest of it.

Answer:

you gotta call her manager dead or alive

The combustion reaction of benzoic acid: 2C7H6O2 + 15O2 → 14CO2 + 6H2O  is the balanced chemical equation for this reaction .

What is Chemical Reaction ?

A chemical reaction is a process that transforms one set of chemical substances, called reactants, into another set of substances, called products. Chemical reactions occur when the atoms in the reactants are rearranged to form new compounds. Chemical reactions can be classified into different types based on the nature of the reactants and products, the rate at which the reaction occurs, and the conditions under which the reaction takes place. Combination reactions: Also known as synthesis reactions, these involve the formation of a new substance from two or more reactants. Decomposition reactions: These are the opposite of combination reactions and involve the breakdown of a single reactant into two or more simpler substances.

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Answer:

107.9

Explanation:

Answer:

The pH of the resulting solution when you mix 15.0 mL of 0.400 M HCl with 15.0 mL of 0.400 M NH3 is 10.93.

Explanation:

The reaction between HCl and NH3 can be represented by the following equation:

HCl + NH3 → NH4Cl

The reaction produces ammonium chloride. Ammonium chloride is an acidic salt that releases NH4+ ions in water. NH4+ ions are hydrolyzed to produce H+ ions in the solution as shown by the following equation:NH4+ + H2O ↔ NH3 + H3O+.Because NH4+ ions are a weak acid, the equilibrium reaction is written as follows:NH4+ ↔ NH3 + H+.

Given that we have the concentrations of the HCl and NH3, we can determine the number of moles of each using the following equations:

Molarity = Moles / VolumeMoles = Molarity × Volume

For HCl: Moles of HCl = 0.4 mol/L × 0.015 L = 0.006 mol

For NH3: Moles of NH3 = 0.4 mol/L × 0.015 L = 0.006 mol

Because HCl and NH3 react in a 1:1 ratio, there are 0.006 moles of NH4Cl produced. Since the volumes of the HCl and NH3 solutions are equal, the final volume of the solution is 30.0 mL, or 0.03 L.

The initial concentration of NH4+ ions is given by the following equation:

[NH4+] = Moles of NH4+ / Volume of Solution

[NH4+] = 0.006 mol / 0.03 L[NH4+] = 0.2 M

The ionization constant expression of NH4+ is given as: Ka = [NH3][H+]/[NH4+]

Taking the initial concentration of NH4+ to be 0.2 M, the initial concentration of NH3 is also 0.2 M (because one mole of NH4Cl produces one mole of NH3 and one mole of HCl).

Let the initial concentration of H+ be x. Substituting the values in the equation, we get: Ka = [0.2][x]/[0.2]

Simplifying, we get:x2 = Ka × [NH4+]x2 = 5.6 × 10-10 × 0.2x2 = 1.12 × 10-10x = √(1.12 × 10-10)x = 1.06 × 10-5pH = -log[H+]pH = -log(1.06 × 10-5)pH = 10.93

Therefore, the pH of the resulting solution is 10.93.

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Relative to the initial configuration, the ball-spring system gained potential energy.

Potential energy is the energy stored that depends on the relative positon of several parts of a system also described as energy of an object's position being relative to another object. A spring system has more potential energy when compressed or stretched and a steel ball raised above ground than after falling.

Potential energy is stored within matter with the application of outside force. Gravitational force must be present to release potential energy stored in the mass of an object.

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Answer: Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. The anode (positive electrode ) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode.