5. If you have 5.0 L of a 3 molar saline solution of sodium chloride in water, how many
grams of NaCl would you find if you boiled off all the water?

Answer:

It is not 100% silver, but it contains a high percentage (more than the 98% for sure) of silver.

Explanation:

Hello,

In this case, since the density of silver is 10.49 g/cm³, we can substantiate if the given sample is silver by computing is density as shown below:

\(\rho =\frac{m}{V}=\frac{1.7kg}{0.164L}*\frac{1000g}{1kg} *\frac{1L}{1000cm^3}\\ \\\rho=10.37g/cm^3\)

In such a way, since we find a slight difference in the computed density, we can say it is not 100% silver, but it contains a high percentage (more than the 98% for sure) of silver.

Regards.

Answer:

The correct answer is - valid.

Explanation:

In this case, there is consistency in the results measures in the experiment which makes this method reliable. The consistency of a measure is referred to the reliability.

It is also given that the level of contamination of individual containers as per the average parameter of the contamination of large containers which makes this method not valid as the measurement method is how correctly it measures the true value of the parameter.

Thus, the correct answer is - method is reliable, but not valid.

Answer:

= 6.21x10^21

Explanation:

It's the train track method, where you try to cancel all the units and end with units that you need. Here we want to end with number of atoms of N.

500 mg N x 1 g N/1000 mg N x 1 mol N/194.19 g N x 4 mol N/1 mol of caffeine x (6.022 x 10^23 particles of N / 1 mol N)

= 6.21x10^21

It is significant to remember that the order of a reaction affects how a reaction's half-life is calculated. It is commonly expressed in seconds and is represented by the sign "t 1/2." The amount which is left after 172.8 years is 0.8 g.

The time it takes for the concentration of a particular reactant to reach 50% of its initial concentration, or the time it takes for the reactant concentration to reach half of its initial value, is known as the half-life of a chemical reaction.

To calculate the remaining amount:

N₀ / N = 2ⁿ

n = time / t1/2

172.8 / 57.6 = 3

N = 2ⁿ / N₀

N = 2³ / 10 = 0.8 g

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The value of missing cell potential is - 0.04 V

The cell potential (Ecell), is the measure of the potential difference between two half cells in an electrochemical cell.

Fe(III) / Fe(II) potential involves different chemical species in acidic and basic solution.

2FeO²⁻ + 3ClO⁻  + 2OH⁻  -->  FeO₄²⁻ + 3Cl⁻  + H₂O

FeO₄²⁻ can easily oxidise water under acidic conditions.

Hence, The value of missing cell potential is - 0.04 V

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A) All these statements are false. Option E is correct.
B) 0.22 M NaCN must be added to a 0.5 M HCN solution to produce a buffer solution with a pH of 7.0. The Ka for HCN is 6.2 x 10–10. So the correct option is E.

A) a. The pH at the equivalence point is greater for HC2H3O2 than for HCl - FALSE. The pH at the equivalence point is the same for both weak and strong acids when titrated with a strong base such as NaOH.
b. HCl is a strong acid and requires more moles NaOH to reach the equivalence point - FALSE. Both HCl and HC2H3O2 require the same amount of moles of NaOH to reach the equivalence point.
c. The pH at the half equivalence point is the same for both solutions - FALSE. The pH of the half equivalence point is different for HCl and HC2H3O2. For HCl, the pH of the half equivalence point is 7, whereas for HC2H3O2, the pH of the half equivalence point is greater than 7.
d) The initial pH is the same for both solutions - FALSE. The initial pH of the two solutions are different due to the different properties of the two acids.
e) All these statements are false - TRUE. All of the statements above are false. Option E is correct.
B) To answer the second part of the question, 0.22 M NaCN must be added to a 0.5 M HCN solution to produce a buffer solution with a pH of 7.0. The Ka for HCN is 6.2 x 10–10. In order to calculate the amount of NaCN required, use the Henderson-Hasselbalch equation:
pH = pKa + log [NaCN]/[HCN]
Rearranging and solving for [NaCN]:
[NaCN] = 10^(7-6.2) x 0.5 = 0.22 M

So the correct option is E.

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Answer:

4^4, or 256

Explanation:

When dividing numbers with exponents and the same base, you will subtract from the exponents and keep the base the same.

Answer:

Explanation:

A molecule is a basic unit of a chemical substance made up of two or more atoms that are bonded together. A compound, on the other hand, is a substance made up of two or more different elements that are chemically bonded together.

Every compound is a molecule because it is made up of at least two chemically bonded atoms, but not every molecule is a compound because a molecule can be made up of the same type of atoms and not be a compound.

For example, molecular oxygen (O2) is made up of two oxygen atoms, but it is not a compound because both atoms are the same element. On the other hand, water (H2O) is a compound made up of hydrogen and oxygen atoms.

A Brainly star would be appreciated if it helped you!

Explanation:

Water molecules form hydrogen bonding when the oxygen of one water molecule combines with the hydrogen of another molecule.

Hydrogen bonding is an electrostatic attraction between the hydrogen atom of one molecule and the electronegative atom of a neighboring molecule.

The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

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Answer:

yes

Explanation:

While galvanic corrosion is driven by the difference in corrosion potential between two metals, the electrolytic corrosion is driven by the external sources of EMF.

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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The compound that contains the atom with the highest oxidation number is CrO₃ (option E).

Oxidation number is the hypothetical charge of an atom within a molecule or compound.

The oxidation number of an atom or ion determines the subscript given to the other elements in the molecule.

According to this question;

Therefore, it can be said that the molecule that posseses the atom with the highest oxidation number is CrO₃.

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The mas.s of evaporating dish is 21.345g B.

Answer:

(Nothing)-But No answer

a. Nitrogen number 2 in guanine typically acts as a hydrogen bond acceptor.

b. N2, N2-dimethylguanine (N2-meG) is less favorable in forming base pairs with cytosine than typical guanine-cytosine (G-C) base pairs because the methylation at nitrogen number 2 changes its properties, causing a decrease in the number of hydrogen bonds and stability of the base pair.

The methyl group disrupts the hydrogen bonding potential of nitrogen number 2, reducing the number of hydrogen bonds formed between N2-meG and cytosine. This leads to a decrease in the stability of the N2-meG: cytosine base pair compared to a typical G-C base pair.

Methylation is the addition of a methyl group (-CH3) to a molecule, and is a common pattern of modification in RNA molecules. One specific pattern of methylation is the double methylation of nitrogen number 2 in guanine to form N2, N2-dimethylguanine (N2-meG). In a typical guanine-cytosine (G-C) base pair, nitrogen number 2 acts as a hydrogen bond acceptor, forming two hydrogen bonds with the nitrogen atoms in the cytosine ring.

However, the formation of a base pair between N2-meG and cytosine is less favorable than the typical G-C base pair due to the effect of the added methyl groups. The methyl groups disrupt the hydrogen bonding potential of nitrogen number 2, reducing the number of hydrogen bonds that can be formed between N2-meG and cytosine. As a result, the stability of the N2-meG: cytosine base pair is lower compared to the G-C base pair.

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The frequency in megahertz of a radio set that is broadcasting at 99.9 meters is 3.00 Mega hertz.

So option A is correct.

Frequency is referred to as the number of occurrences of a repeating event per unit of time which is also occasionally referred to as temporal frequency to emphasize the contrast to spatial frequency, and ordinary frequency to emphasize the contrast to angular frequency.

Frequency and wavelength are important characteristics of a wave cycle. We know that wavelength refers to the distance between any two corresponding points on adjacent waves while frequency is the number of waves that pass, in a specified amount of time, at a certain point.

From the question above

wavelength = 9.99 m

velocity = 3.0 * 10^ 8

Frequency =?

Frequency = velocity/  wavelength

frequency =  3.0 * 10^ 8 /  9.99 m

frequency = 3003003.003

frequency= 3.0 Megahertz.

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Answer:

location 2

Explanation:

answer and explanation

we are given initial values of temperature, pressure and volume as well as the final value of temperature and pressure and we are asked to find the final volume.

we can do this using the combined gas equation

P1V1/T1 = P2V2/T2

when we plug in the values we get:

(6atm x78L)/53K = (85atm x V2/17K

8.83 = 85atm x V2 / 17K

V2 = 1.77 Liters

Answer:

saturated refers to a point of maximum concentration, in which no more solute may be dissolved in a solvent.

Acid:sulfuric,nitric

Basic salt:Calcium carbonate (CaCO3)

Sodium acetate (NaOOCCH3)

Explanation:

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Answer:

130 Liters

Explanation:

if 1 mol is 22.4 L, then 5.8 mol is 130 L (129.92 but use sig figs)

Answer:

Fe + CuCl2 = FeCl2 + Cu

Explanation:

This is already balanced.

Answer:

Explanation:

we will do ratio method

Aluminum chloride :  Aluminum

2                               :      2

0.48                          :      x

(cross multiply)

0.48 x 2 / 2 = 0.48 moles of aluminum  

mass = 1 mole of aluminum chloride x moles

mass = 133.33 x 0.48

mass = 63.9984g (round off) = 64g

I hope this helps.

Answer:

Answer:  What can experiments in a lab tell us about substances on Titan? Experiments in a lab can tell us that the lake did not evaporate in 2007 because the molecular attraction was a lot stronger, then it got weaker overtime.

How does Dr. Hayes' and Dr. Malaska’s research differ? Why are both research projects important? Their research differs because they were both talking about different things, Hayes was talking about how many lakes there were, while Malaska's was doing more hands on stuff like experiments. Both are important because we need to learn how the lakes formed, but we also need to do hands on experiments.

Explanation:

In magnesium oxide, MgO, the mole ratio of magnesium to oxygen is 1:1

Mole ratio refers to the ratio in which moles of elements combine to form compounds, or in which reactants combine to form products.

Mole ratio is calculated using the formula below:

When magnesium and oxygen combine to form magnesium oxide, MgO, the mole ratio of magnesium to oxygen is 1:1

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Exothermic refers to chemical interactions that aerobic respiration. Combustion reactions release higher energy. Endothermic refers to atoms and molecules that either use or absorb reactive power.

A chemical process known as an endothermic releases energy as heat or light. It is an endothermic reaction's opposite. Chemical equation expressed as reactants + products + energy. An reaction mechanism is one in which electricity is given off as light or warmth.

A response is deemed to be exothermic if it produces heat while also undergoing a net decrease in basic enthalpy change. Samples include those type of combustion, iron rust, including water froze. Exothermic processes are those that discharge heat and energy into the surroundings.

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The actual voltage of each battery is:

Let's denote the voltage of the second battery as "V". Then, according to the problem statement, the voltage of the first battery is 2V, and the voltage of the third battery is V/2.

When three batteries are connected in series, the total voltage is the sum of the individual voltages. Therefore

Total voltage = voltage of first battery + voltage of second battery + voltage of third battery

54 V = 2V + V + (V/2)

Multiplying the third term on the right side by 2 to get a common denominator:

54 V = 2V + V + (1/2)V

54 V = (5/2)V

V = (2/5) x 54 V

V = 21.6 V

So, the voltage of the second battery is V = 21.6 V.

Using this value, we can find the voltage of the first and third batteries:

Voltage of first battery = 2V = 2 x 21.6 V = 43.2 V

Voltage of third battery = V/2 = 21.6 V / 2 = 10.8 V

Therefore, the actual voltage of each battery is:

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The molecular weight of the molecular compound is

x= 105.57 g/mol

Generally,a  the equation for Mole of molecular compound is  mathematically given as

Mm= mass / molar mass

Therefore

Mm= 0.333 g / x

the equation for Morality

M = mole of solute / mass of solvent

\(M = \frac{(0.333 g / x )}{33.3 g / 1000 }\)

M= 10 / x

the equation for change in temp dt

dt= K* morality

Therefore

\(0.485 = \frac{5.12}{ * 10/ x}\)

x = (5.12 *10) / 0.485

x = 105.57 g/mol

In conclusion, molecular mass of molecular compound

x= 105.57 g/mol

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Answer:

Empirical formula of a compound means that it provides simplest ratio of whole number.

Explanation:

Mass of boron and chlorine is 9.224% and 90.74%