is a solution with h3o = 1.4 x 10-4 m acidic basic or neutral

The statement a stable nucleus has a similar number of protons and neutrons is true about stable isotopes (Option D).

A radioactive isotope can be defined as a chemical element that emits energy in form of different types of radiation such as alpha radiation or beta radiation, which is due they are unstable in normal conditions.

Therefore, with this data, we can see that the radioactive isotopes are unstable and they can emit energy based on diverse types of radioactive emissions such as alpha rays and or beta rays.

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The pOH of a 3.6pH solution is 10.4. This indicates the alkalinity of a solution based on the hydroxide ion concentration.

pH is the negative logarithm of hydrogen ion concentration while pOH is the negative logarithm of hydroxide ion concentration. High value of pH indicates the alkalinity of the solution while high value of pOH indicates the acidity of the solution.

The sum of pH and pOH is equal to the dissociation constant of water, which is 14. pOH can be obtained using the value of pH given above.

pH + pOH = 14

3.6 + pOH = 14

pOH = 14- 3.6

pOH =  10.4

The 10.4 pOH value indicates that the solution is considered acidic since it is between the value of 8 to 14. Based on this pOH value, the hydroxide concentration is \(10^{-10.4}\) or 3.98x10-11 mol/L.

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preferAnswer:

The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds. Atoms will react to get in the most stable state possible

Explanation:

Hopefully this is what your looking for

Answer:

troposphere

Explanation:

Answer:

Hello!!! Princess Sakura here ^^

Explanation:

We live in the troposphere since 99% of the water vapor in the atmosphere is found here.

We can make use of the fact that the total pressure of the mixture is the same as the sum of the partial pressure of all the gases in the container. As a result, 400 kPa is the third gas' partial pressure.

The overall pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each of the constituent gases, according to Dalton's law of partial pressures. The partial pressure is the pressure that each gas would have if it occupied the same volume of the mixture at the same temperature on its own.

Mathematically, this can be stated as:

P_total = P_1 + P_2 + P_3

When we plug these figures into the formula, we get:

800 kPa = 100 kPa + 300 kPa + P_3

When we simplify this equation, we obtain:

800 kPa = 400 kPa + P_3

By taking away 400 kPa from both sides, we arrive at:

P_3 = 400 kPa

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Answer:

~2.054M

Explanation:

In this question ,I am going to assume that the acid is monoprotic acid(contains only one hydrogen) which I'll represent by HA.

Chemical equation:

NaOH(aq) + HA(aq)----->NaA(aq) + H2O(l)

The mole ratio of NaOH:HA is 1:1

1.25M NaOH=1.25 Moles/L or 1.25 moles /1000ml of NaOH

(1.25 moles /1000ml) x (24.65ml)=0.0308125 moles NaOH

Mole ratio is 1:1

So, moles of HA are also 0.0308125 moles

volume of HA  =15ml

To find molarity of HA:

=(0.0308125 moles x 1000ml)/(15ml)

~2.054M of HA

~Hope it helps:)

The mass of solution is equivalent to the mass of the solute and solvent.

The material whose dissolves is known as a solute, as well as the substance

The solute is dissolved to produce a solution, is known as a solvent.

Solution is made by solvent , solute also. So, by adding mass of solvent and solute mass of a particular solution could be found.

It can be expressed as:

Mass of solution = mass of solute + mass of solvent

Therefore, the mass of solution is equivalent to the mass of the solute and solvent.

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Answer: The reactants have four hydrogen atoms and four oxygen atoms. On the other hand, the products have just two hydrogen atoms and three oxygen atoms. So, to balance the chemical equation, there should be two more hydrogen atoms and one more oxygen atom. This imbalance can be corrected by placing the number 2 in front of H2O on the reactants' side.

The number of moles of a substance is calculated from the given weight of the substance and its molecular mass by using the formula:

No. of moles = \(\frac{Mass of substance in grams}{Molecular mass of substance}\)

Molecular mass of Na₂SO₄.10H₂O is calculated to be

(23×2)+32+(16×4)+(10×18) = 46+32+64+180 = 322 g/mol

Thus, for 483g of Na₂SO₄.10H₂O, the number of moles would be

= \(\frac{322}{483}\) = 0.67 mol

For every 1 mole of Na₂SO₄.10H₂O, there are 2 moles of Na⁺ and 1 mole of SO₄²⁻.

Thus, 0.67 moles of Na₂SO₄.10H₂O will have 0.67×2= 1.34 moles of Na⁺ and 0.67 moles of SO₄²⁻.

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The properties of the element and its compounds are not the same. In the case of fluorine, we know that this is a volatile and reactive element but fluorides are stable and less harmful elements that can serve beneficial purposes.

Fluorine is a chemical element that is known for its ability to combine easily with oxygen and other elements. It is a highly reactive substance but this is not the case with fluorides. The fluorides have already undergone a reaction so they are no longer as volatile as fluorine in the ordinary state.

They are used in toothpaste formulations to strengthen the gums but this cannot be said of fluorine which should not be tasted in the raw state.

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Answer:

A

Explanation:

The answer is A) because the A container has tightly packed molecules but not as tight as C so that means A is liquid, and C is a solid which makes B a gas

Answer:

The answer would be A

Explanation:

because in the first picture Liquid could be in many shapes like If I put water in my water bottle it would be the same shape as the water bottle.

In the third picture, the solid molecules will always be so close to each other like they will be stick to each other.

In the second picture, It will be separate always, as it cant stick to each other.

I hope I helped you!!!!

:)

Answer:

Since they have an electronegativity difference of 0.4 then they will form a Covalent Bond.

Answer:

the solution is acidic as its ph has already exceeded the neutral level

\(1.1 X 10^-9 M\) is the [H] in a solution with a pH of 9.92.

pH is the quantitative measure of the acidity or basicity of aqueous or other liquid solutions.

The pH of a solution is usually found by the following expression:

pH=-log [\(H^+\)]

Therefore, to find the concentration of \(H^+\) we can rearrange this expression and thus,

= [\(H^+\)] = \(10^-^{pH}\)

= [\(H^+\)] = \(10^-^{9.92}\)

=\(1.1 X 10^-9 M\)

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The substance used for decolorization of undesirable color in a crystalline substance is powdered animal charcoal

Decolorization is the process of eliminating organic contaminants with vivid colors from the sample mixture.

Unwanted colors are removed by boiling the item with a suitable amount of powdered animal charcoal in a hot solution that has been filtered so that the charcoal may absorb the colors. The charcoal is a finely divided carbon.

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A catabolic pathway is a d) a set of reactions that release energy that can be used to drive cellular work

A catabolic pathway involves a series of reactions that break down complex molecules into simpler ones, releasing energy in the process. This energy is then utilized by the cell to perform various tasks. Option d correctly identifies a catabolic pathway as a set of reactions that release energy, which can be used to drive cellular work.

During catabolism, large molecules such as carbohydrates, proteins, and fats are broken down into smaller molecules like glucose, amino acids, and fatty acids.

These molecules are then further degraded through oxidation reactions, releasing energy in the form of ATP (adenosine triphosphate). ATP serves as the primary energy currency in cells, providing energy for various cellular processes.

By breaking down complex molecules and releasing energy, catabolic pathways enable cells to obtain the necessary energy to carry out essential functions like metabolism, growth, and movement. So d is correct option.

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To make a 50.0 mL solution of 1.7 M sodium carbonate (Na₂CO3), we need to determine the mass of Na₂CO3 required.

To calculate the mass of Na₂CO3 needed, we can use the formula:

Mass = Concentration x Volume x Molar Mass

First, we convert the given volume from milliliters to liters:

Volume = 50.0 mL = 50.0/1000 L = 0.05 L

Next, we substitute the given concentration and volume values into the formula:

Mass = 1.7 M x 0.05 L x Molar Mass of Na₂CO3

The molar mass of Na₂CO3 can be calculated by adding the atomic masses of sodium (Na), carbon (C), and three oxygen (O) atoms:

Molar Mass of Na₂CO3 = (2 x Atomic Mass of Na) + Atomic Mass of C + (3 x Atomic Mass of O)

After obtaining the molar mass value, we can substitute it into the formula and perform the calculation to determine the mass of Na₂CO3 required to make the 50.0 mL solution of 1.7 M sodium carbonate.

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The solution that is a buffer is a solution that is 0.100 M in HNO₂ and 0.100 M in NaNO₂  .

A weak acid and its conjugate base, or a weak base and its conjugate acid, must be combined to create a buffer solution. Only HNO2 (Weak Acid) and NaNO2 are included in the list as an acid and its conjugate base (Conjugate Base). Given that all concentrations are equivalent, the pH of this solution would be the same as the pKa of HNO2 (3,15).

Acids that don't entirely dissociate in solution are referred to as weak acids. In other words, any acid that is not a strong acid qualifies as a weak acid. The amount of dissociation determines how strong an acid is; the more dissociation, the stronger the acid.

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The empirical formula for a compound that contains 53.3% C, 11.2% H, and 35.5% O by mass is C₂H₅O.

Given that :

mass of the carbon = 53.3 g

mass of the oxygen = 11.2 g

mass of the sulfur = 35.5 g

molar mass of carbon = 12 g/mol

molar mass of hydrogen = 1 g/mol

molar mass of oxygen  = 16 g/mol

the moles of carbon = 53.3 / 12

                                   = 4.43 mol

the moles of hydrogen = mass / molar mass

                                      =  11.2 / 1

                                      = 11.2 mol

the moles of oxygen = mass/ molar mass

                                   = 35.5 / 16

                                   = 2.21 mol

dividing by the smallest one:

C = 4.43 / 2.21 = 2

H = 11.2 / 2.21 = 5

O = 2.21 / 2.21 = 1

Thus, the empirical formula is C₂H₅O.

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The volume of a bar of soap that has a density of 2.5 g/cm3 and a mass of 100 g is 40 cm ³. Therefore, option D is correct.

The mass of a substance per unit of volume is its density. A mechanically accepted measure is density. Density is most frequently represented by the symbol, however the Latin letter D may also be used.

The mass of a solid substance's unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density.

Density = m / V

volume = mass / density

= 100 / 2.5

= 40 cm³

Thus, option D is correct.

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Labels and SDS provide the same amount of information about chemicals. The answer is B) False.

Labels and Safety Data Sheets (SDS) provide different types and amounts of information about chemicals. Labels typically include basic information such as the product name, manufacturer, hazardous ingredients, and warning statements about potential hazards. Labels usually provide concise, essential information about a chemical, including hazard warnings, product identification, and first aid measures. SDS, on the other hand, provide more comprehensive information about a chemical including physical and chemical properties, health hazards, first aid measures, handling and storage precautions, and emergency procedures. In fact, SDS can be dozens of pages long and provide much more detailed information than a label alone. It's important to read both the label and SDS to fully understand the hazards associated with a chemical and how to handle it safely.
Labels and Safety Data Sheets (SDS) both provide important information about chemicals, but they differ in the amount and type of details they offer.

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Answer:

the mass of the new copper roof will increase over time as it turns green

Explanation:

this is because copper will react with atmospheric substances to form copper compound. this does not violate the law of conversation of mass because the mass increases as copper react with atmospheric substances in the presence of atmospheric air, oxidizes to copper compounds which are heavier in mass than copper atoms

According to the law of conservation of mass, the mass of the copper roof increases as oxygen is added to it to form copper oxide.

Oxidation is a reaction in which oxygen is added to an element.

Oxidation metals in the presence of air occurs frequently as metals are reactive.

Copper roof turns green with time as the metals react with oxygen in air to form copper oxide.

The mass of the new copper roof increases in accordance with the law of conservation of mass as oxygen is added to metallic copper to increase it's mass.

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98.684 ml of 95% ethanol solution and 26.316 ml of water are required to prepare 125 ml of 75% ethanol solution.

What is a solution?

A solution is a uniform mixture of two or more components with particles smaller than one nanometer.

There are many different types of solutions, such as soda water, salt-and-sugar solutions, and others. In a solution, each component appears as a separate phase. The distribution of the particles is uniform, or there is particle homogeneity. This explains why the full contents of a soft drink bottle have the same flavour.

Let x ml of the 95% ethanol solution be the volume.

According to the law of conservation of mass, the amount of ethanol in x millilitres of 95% ethanol solution is equivalent to the amount in 125 millilitres of 75% ethanol solution.

⟹M1 V1 =M 2 V 2

In this instance: M 1 = 0.95, V 1 = x ml, M 2 = 0.75, V 2 = 125 ml, and V 1 = 98.684 ml.

But [V 2] = 125 ml for the ultimate volume.

Therefore, 98.684 ml of 95% ethanol solution and 26.316 ml of water are required to prepare 125 ml of 75% ethanol solution.

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Answer:

It helps us to insure what will the current rate will be to those subject or nartual disaster can conquere

The statement true for a balanced equation is option d) the sum of all atoms must be the same on both the reactant and product sides.

A balanced equation is one that satisfies the law of conservation of mass in a chemical reaction by ensuring that the same number of atoms of each element is present on both the reactant and product sides. Balancing a chemical equation is essential because it helps us to predict the outcome of a reaction, calculate the number of reactants required for a reaction, and determine the number of products that will be formed in the reaction.

Balancing a chemical equation involves adjusting the coefficients (numbers placed in front of each compound or element) in the equation until the same number of atoms of each element is present on both sides. The sum of all coefficients must be equal on both sides to maintain balance in the chemical equation.

However, the sum of all superscripts and subscripts need not be the same on both sides of the equation.

Therefore, the statement that is true of a balanced equation is that the sum of all atoms must be the same on both the reactant and product sides. This ensures that the law of conservation of mass is satisfied, which states that matter can neither be created nor destroyed in a chemical reaction.

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1107 Joule is the amount of energy which is needed to change 88.0 g of solid benzene at 5.53°C into liquid benzene, also at 5.53°C.

In order to perform work and to produce heat and light, energy must be delivered to a body or to an external physical system. Energy is a quantitative property. Energy is a preserved resource; according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed. 

A moving object's kinetic energy, an object's potential energy, an object's elastic energy, chemical energy linked to chemical reactions, electromagnetic radiation's radiant energy, and the internal energy of a thermodynamic system are examples of common kinds of energy.

mole of benzene = 85.2/78.11 =1.09mol

1 mole of benzene requires  10.19 kJ/mol energy

1.09 mole of benzene requires 1.09× 10.19 kJ/mol = 11.107kJ/mol energy

                                                                                  = 1107 Joule energy

Therefore,  1107 Joule is the amount of energy which is needed to change 88.0 g of solid benzene at 5.53°C into liquid benzene, also at 5.53°C.

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Answer: 61.98 is correct

Explanation:

Molar mass of calcium nitrate is 164  g/mole which is obtained by adding atomic weights of constituent elements.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.

Molar mass of calcium nitrate =40+[14+(16×3)]×2=164 g/mole.

Thus, the molar mass of calcium nitrate is 164 g/mole.

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Answer:

plants

animals

Explanation:

From the given choices only plants and animals are biotic in nature. Biotic factors are factors that can be attributed to living organisms.

The other choices such as water, light and minerals are abiotic. They are do not originate from living organisms.

Both biotic and abiotic factors are present within the ecosystem. In fact, they influence the ecosystem to a very large extent.

Together, these factors shapes the ecosystem.

The transition points for each phase change are the melting point, boiling point, freezing point, and condensation point.

The melting point is the temperature at which a solid substance melts and turns into a liquid.

The boiling point is the temperature at which a liquid turns into a gas. The freezing point is the temperature at which a liquid turns into a solid, and the condensation point is the temperature at which a gas turns into a liquid.

The effect of energy in phase transitions of matter is that it is required to change the phase of matter.

For example, when a solid is heated, energy is added to it, which causes its temperature to increase until it reaches its melting point.

At the melting point, the energy causes the solid to melt and become a liquid. Similarly, when a liquid is heated, energy is added to it, causing its temperature to increase until it reaches its boiling point. At the boiling point, the energy causes the liquid to turn into a gas.

Changes in temperature and states of matter are represented in heating and cooling curves by plotting temperature against time.

Heating curves show the change in temperature of a substance as heat is added, and cooling curves show the change in temperature of a substance as heat is removed.

The flat regions on the curve represent the phase changes, where the energy being added or removed is being used to change the state of the substance rather than to increase or decrease its temperature.

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Answer:7

Explanation:

Answer:

its c

Explanation: