The balance you used for weighing the metal strip does not zero properly, and consequently, all of your mass measurements are high by precisely 0.050 g (e.g., if you read "20.450 g", the real value was 20.400 g). what effect would this have on your experimental value of avogadro's number?

The solubility of KCl is only 65.8 g/100 g water.This means that NaCl is more soluble than KCl at the same temperature

It is a physical property that is affected by temperature, pressure, and other characteristics of the solution. Solubility can be measured in terms of the maximum amount of solute that will dissolve in a given amount of solvent at a given temperature. When a substance is completely soluble, it is said to be saturated. Different solutes have different solubilities, which depend on the nature of the solute and the solvent.Solubility is an important factor in many industrial processes, such as pharmaceutical manufacturing and food processing.

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Answer:

Explanation:

C + O2 → CO2

Mole of C = 24 g/(12 g/mole)

Mole of C = 2 mole

Mole of molecular O2 = 74 g/(32 g/mole)

Mole of molecular O2 = 2.3125 mole

Since mole of C < mole of O2, then C being the limiting reagent.

From the reaction, it shows that mole ratio between C and O2 = 1 : 1.

So, 2 moles of C will stoichiometrically react with 2 moles of O2 to generate 2 moles of CO2.

Avogadro's law states that :"equal volumes of all gases, at the same temperature and pressure, have the same number of molecules i.e. 6.02 x 10^23 molecules/mole.

Therefore, 2 moles of CO2 contain 2 moles x 6.02 x 10^23 molecules/mole = 1.204 x 10^24 molecules of CO2 is formed.

Answer:

acids or bases can be tested

by chemical indicators

Answer:

it's volume also decrease

Among the given elements, tin (Sn) with element number c is expected to have the most stable nuclides due to its relatively low atomic number and a neutron-to-proton (N/Z) ratio close to 1. Here option C is the correct answer.

To determine which element among a, b, c, d, and e would have the most stable nuclides, we need to consider the concept of nuclear stability. The stability of a nucleus is influenced by the balance between the strong nuclear force, which holds the nucleus together, and the electrostatic repulsion between protons within the nucleus.

One way to evaluate nuclear stability is to examine the neutron-to-proton (N/Z) ratio. In general, for lighter elements, a stable nucleus tends to have an N/Z ratio close to 1, while for heavier elements, the ratio tends to increase. Elements with a larger number of protons (Z) require more neutrons (N) to stabilize the nucleus against repulsive forces.

Now, let's analyze the given elements:

a. Element 47 is silver (Ag).

b. Element 48 is cadmium (Cd).

c. Element 50 is tin (Sn).

d. Element 51 is antimony (Sb).

e. Element 52 is tellurium (Te).

Among these elements, tin (Sn) with element number c has the most stable nuclides. Tin has a relatively low atomic number, and its N/Z ratio is close to 1, making it more stable compared to the other elements listed. As we move towards heavier elements, the N/Z ratio increases, indicating a less stable nucleus.

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The method of seed dispersal of the pea plant happens in a mechanical way when the seeds disperse in different directions in what is known as explosive dispersal.

This refers to the movement of seeds through a variety of means from the parent plant.

Hence, we can see that the method of dispersal for the blueberry plant is through the process of suc--kering which occurs when new shoots grow and form new suc--kers from the main root cluster.

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False. A polypeptide will have a negative net charge at ph=0.

A peptide is a small, chemically bound chain of amino acids, usually between two and fifty amino acids (called peptide bonds). A polypeptide is a longer (51 or more amino acids) chain of connected amino acids. One or more polypeptides are used to create the proteins that are produced inside of cells.

Polypeptides. Proteins are created by joining several amino acids together to form polypeptides. The coupling of two or so more polypeptides results in the formation of proteins, after which they are folded into the appropriate shape.

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Answer:

the first one

Explanation:

Answer:

I think its b be ause it looks like a better answer and it has some detail to it

Answer:

False

Explanation:

Mass number is the quantity of protons and neutrons within one atom while the atomic mass is the average mass of all isotopes of the element.

Answer:

false :)

Explanation:

Answer:

c or d

Explanation:

it says it was playing classic music

In this case, the control group or control variable is the greenhouse where the plants are grown in silence, as this group does not receive any music treatment. Therefore, the correct answer is A.

Variables can be defined as any characteristics, number or a quantity that can be measured . It is also  called as a data item . It is called as variable because it can vary and can also have  wide variety of values.

There are 3 types of variables 1) manipulated variable where the condition is specified, 2) responding variable which is dependent on the manipulated variable 3)controlled variable which does not change.

In this experiment, the control group is the group that does not receive the experimental treatment and serves as a basis for comparison.

Thus, the correct answer is A , the silent greenhouse.

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The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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The alpha of the investment is - 0.8%.

The alpha of an investment is a measure of its risk-adjusted performance. It indicates the excess return earned by the investment compared to the return predicted by the market based on its beta.

The formula to calculate alpha is:

alpha = actual return - expected return

where the expected return is the risk-free rate plus the product of the market return and the investment's beta.

Here, we are given:

actual return = 10%

market return = 10%

risk-free rate = 2%

beta = 1.1

Expected return = risk-free rate + beta * (market return - risk-free rate)

Expected return = 2% + 1.1 * (10% - 2%)

Expected return = 10.8%

Therefore, the alpha of the investment is:

alpha = actual return - expected return

alpha = 10% - 10.8%

alpha = -0.8%

The negative value of alpha indicates that the investment underperformed compared to what was expected based on its beta and the market return.

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Complete Question

Answer:

The addition of hydronium ion increases the solubility of the salt

Explanation:

When a weak acid, MA dissociates in an aqueous solution, the following products in equilibrium are obtained;

MA ----> M+ + A-

The anion which is a conjugate base will be removed from the solution with the addition of a hydronium ion from an acid: 2H3O+ + 2A- ----> 2HA + 2H20

This distorts the reaction equilibrium. According to Le Chatelier’s principle, more MA will dissolve until in order to restore the previous equilibrium of the reaction.

Therefore, an acidic pH increases the solubility of almost all sparingly soluble salts whose anion is the conjugate base of a weak acid.

The brush used for artificial nail services is made the of a. nylon

This type of hair is preferred because it is easy to clean and durable. Nylon hair also has the ability to hold onto liquid products, such as acrylic or gel, without soaking them up too quickly, allowing the nail technician to have more control over the application process. While natural hair brushes may be used for some services, such as gel polish application, they are not ideal for use with acrylics or other liquid nail products as they can absorb too much of the product and become damaged over time.

Plastic brushes are not typically used in artificial nail services, as they are not as effective at holding and applying the products. Overall, a nylon hair brush is the preferred choice for artificial nail services due to its durability, ease of cleaning, and ability to hold liquid products.

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Answer:

solid and liquid state respectively

Answer:

A - solid, liquid

Explanation:

ur welcome

Answer:

Its physical structure

Explanation:

A number placed in front of a chemical symbol or formula in a chemical equation is called a coefficient.

Coefficients are used to balance a chemical equation by adjusting the relative numbers of reactant and product molecules to satisfy the law of conservation of mass. For example, the balanced equation for the reaction between hydrogen gas and oxygen gas to form water is:

2H₂(g) + O₂(g) → 2H₂O(l)

In this equation, the coefficients in front of the reactants and products (2 and 1, respectively) indicate that two molecules of hydrogen react with one molecule of oxygen to form two molecules of water. The coefficients must be chosen so that the number of the atoms of each of the element is the same on both sides of the equation.

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First of all, Z is unknown. I hope it is a mistake.

        Now, it is given that the element X has nineteen electrons. This proves that X is actually Potassium.

        As per the periodic table, both Potassium and Lithium belongs to group 1 as their valency is 1 because of the presence of only one electron in the outermost shell of electrons i.e., they lose an electron during a chemical reaction to form a stable compound. Furthermore, both are metallic.

        Magnesium belongs to group 2 and hence its valency is two, which is different from potassium though it is metallic. Similiarly, bromine belongs to group 17 and gains one electron during a reaction in contrast to potassium.

( No internal links available for reference. For clarification, check the periodic table).

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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For this question, we are going to use two formulas to find the energy, the first one is already described in the question itself, which is:

E = h*f

Where:

E = energy

h = planck's constant, 6.63*10^-34

f = frequency, which we have to find

And the next formula will be:

f = c/λ

Where:

f = frequency

c = speed of light, 3.00*10^8 m/s

λ = wavelenght, 510 nm

Now let's solve the frequency formula first:

f = 3.00*10^8/510*10^-9

f = 5.88*10^14

Now we use this value of frequency to find the energy

E = 6.63*10^-34 * 5.88*10^14

E = 3.9*10^-19 J

Answer:

His average speed is 3 meters per second.

Explanation:

The average speed is given by:

\( \overline{v} = \frac{d_{T}}{t_{T}} \)

Where:

\(d_{T}\): is the total distance

\(t_{T}\): is the total time

If he can now push the weight 75 meters in 25 seconds we have:

\(d_{T}\) = 75 m and \(t_{T}\) = 25 s

Hence, his average speed is:

\( \overline{v} = \frac{d_{T}}{t_{T}} = \frac{75 m}{25 s} = 3 m/s \)

Therefore, his average speed is 3 meters per second.

I hope it helps you!                                

Answer:

The balance equation of Ca(OH)2 + HCl ---> CaCl2 + H2O​

is

Ca(OH)2(s) + 2HCl(aq) ---> CaCl2(aq) +2H2O​ (l) (balanced equation)

The pressure exerted by the water vapor molecules in the air is called the vapor pressure.

The Vapor pressure is the measure of the tendency of the material to change in to the gaseous state or the vapor state, and it will increases with the temperature. The temperature at which the vapor pressure of the surface of the liquid will becomes equal to the pressure that is exerted by the surroundings is called as the boiling point of the liquid.

The pressure exerted by the vapor in the thermodynamic equilibrium with the its condensed phases at the given temperature in the  closed system is termed as the vapor pressure.

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Answer: neutralization reaction

Explanation: In this reaction, the sodium hydroxide (NaOH) reacts with the acetic acid (CH3COOH) to produce sodium acetate (CH3COONa) and water (H2O). This is a type of acid-base reaction, where the NaOH is a strong base that reacts with the CH3COOH, a weak acid, to form the salt CH3COONa, which is a weak acid conjugate base, and water.

Answer:

84.00g CO2 * 1mol CO2/44.009g CO2 * 25mol O2/16mol CO2 * 31.998g O2/1mol O2 = 95.43g O2

Explanation:

Here is the answer in picture form

The pH of a solution of H2Se with a concentration of 0.38 is 4.94.

What is pH?

The pH of a solution can be calculated using the formula:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in the solution.

For a solution of H2Se, we first need to determine the concentration of hydrogen ions (H+). H2Se is a weak acid that dissociates according to the following equilibrium reaction:

H2Se (aq) + H2O (l) ↔ H3O+ (aq) + Se2- (aq)

The equilibrium constant expression for this reaction is:

Ka = [H3O+][Se2-]/[H2Se]

Since H2Se is a weak acid, we can assume that its dissociation is negligible compared to its initial concentration, so we can simplify the expression to:

Ka = [H3O+]^2/[H2Se]

Rearranging this equation, we get:

[H3O+] = sqrt(Ka[H2Se])

The Ka for H2Se is 1.3 x 10^-9, so we can substitute this value along with the concentration of H2Se (0.38) into the equation to get:

[H3O+] = sqrt(1.3 x 10^-9 x 0.38) = 1.15 x 10^-5

Finally, we can use this value to calculate the pH:

pH = -log[H3O+] = -log(1.15 x 10^-5) = 4.94

Therefore, the pH of a solution of H2Se with a concentration of 0.38 is 4.94.

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Speed in meters per second:  = 1.1117 m/s . Speed in miles per hour

1) a) 120 × 6000 = 720000 = 7.2 × 10⁵b) 3000000 ÷ 0.00015

= 20000000000 = 2 × 10¹⁰2)

Volume of a liter = 1000 cubic cm = 1 cubic decimeter 1 cubic meter = 1000 cubic decimeters

1 liter = 1000 cubic centimeters

1 liter = 0.001 cubic meters

3) 1 km/h = 0.27778 m/s

So, 90 km/h = 25 m/s1 mile = 1.60934 km1 km = 1000 m1 hour = 60 minutes

So, 90 km/h = 55.92 mph4) a) 36.5 fathoms/min = 219 ft/min = 3.65 ft/s 1 ft = 0.3048 m 3.65 ft/s = 1.1117 m/s

b) 1 mile = 5280 ft

1 hour = 60 minutes

36.5 fathoms/minute

= 219 ft/minute

= 3.65 ft/second

= 2.4773 miles/hour

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