The level of a liquid (i.e. distilled water) in laboratory glassware is determined by sight. The level corresponds to a specific volume. The volume is established by identifying the meniscus of the liquid relative to a calibration mark or series of calibration marks on the glassware (ie. volumetric flask vs. buret). Which of the following statements is NOT correct when reading the meniscus?
a. The edge of the meniscus should be used to determine volume relative to the mark or marks
b. The meniscus should be read at eye level
c. When the meniscus is between marks, estimate the reading to the nearest tenth of a division (ie, estimate to 0.01 mL if buret has 0.1 ml divisions)
d. The center of the meniscus should be used to determine volume relative to the mark or marks

Answer:

no.3 is your correct answer

Answer:

compound

Explanation:

it is calcium oxide, also known as quicklime

Answer:

B

Explanation:

The scientist had a wrong hypothesis?

Answer:

it would be C.

Explanation:

becuase the scientist would know what to to next time for his next experiment. even if it went wrong, he can try to get it right again.

Answer:

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.In other words, the mass and the charge are balanced on both sides of the reaction.

Explanation:

The liquid substance used in the laboratory for dissolving dry mortar on floor flies is hydrochloric acid.

Hydrochloric acid is a strong acid that can dissolve many materials, including dry mortar.

Hydrochloric acid also known as muriatic acid or sulfuric acid, are commonly used to dissolve hardened mortar or concrete residues.

To use hydrochloric acid to dissolve dry mortar, you will need to mix the acid with water in a ratio of 1 part acd to 10 parts water.

You should then apply the mixture to the dry mortar using a brush or spray botle.

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Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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Answer:

D Contains most of the total mass

Explanation:

The mass of an atom is protons + neutrons (both found in nucleus)

The molality of the solution is 1.89 mol/kg

Molality is defined as the number of moles of solute per kilogram of solvent. To calculate the molality of the aqueous sodium chloride solution, we need to first calculate the number of moles of sodium chloride in the solution, and then determine the mass of water in the solution.

The molar mass of sodium chloride (NaCl) is 58.44 g/mol. Therefore, the number of moles of NaCl in the solution is:

148 g / 58.44 g/mol = 2.53 mol

The mass of water in the solution is the total mass of the solution minus the mass of the solute:

Mass of water = Total mass of solution - Mass of NaCl

Mass of water = 1490 mL x 1 g/mL - 148 g

Mass of water = 1342 g

The mass of water in kilograms is:

Mass of water (kg) = 1342 g / 1000 g/kg = 1.342 kg

Therefore, the molality of the solution is:

Molality = 2.53 mol / 1.342 kg ≈ 1.89 mol/kg

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Answer:

First, we need to determine the molar mass of HCl.

The molar mass of HCl = the mass of hydrogen (1.008 g/mol) + the mass of chlorine (35.45 g/mol) = 36.45 g/mol.

Next, we can use Avogadro's number (6.02 x 10^23 molecules/mol) to convert the number of molecules to moles:

6.02 x 10^24 molecules / 6.02 x 10^23 molecules/mol = 10 moles

Finally, we can use the molar mass to convert moles to grams:

10 moles x 36.45 g/mol = 364.5 grams

Therefore, the mass of 6.02 x 10^24 molecules of HCl is 364.5 grams.

Answer:

Physical Property

Explanation:

As there is no chemical change or chemical related stuff in it!

Answer:

physical

Explanation:

Answer:

1/4

Explanation:

From the question given above, the following data were:

Original amount (N₀) = 100 g

Time (t) = 24.8 h

Fraction remaining =?

NOTE: The half-life of K–42 is 12.4 h

Next, we shall determine the number of half-lives that has elapse. This can be obtained as follow:

Time (t) = 24.8 h

Half-life (t½) = 12.4 h

Number of half-lives (n) =?

n = t / t½

n = 24.8 / 12.4

n = 2

Finally, we shall determine the fraction remaining. This can be obtained as follow:

Number of half-lives (n) = 2

Fraction remaining =?

Fraction remaining = 1/2ⁿ

Fraction remaining = 1/2²

Fraction remaining = 1/4

Answer:

denser than freshwater due to the sodium chloride dissolved in it.

Explanation:

t. This means that a specific volume of salt water is heaver than the same volume of freshwater. ... While colder water is denser, when water freezes into ice, it becomes less dense and floats on the surface

Answer: oxidation state of the transition metaliii

Explanation:

Answer:

clouds

Explanation:

Answer:

The waters' temp increased

Explanation:

The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.

Answer:

172 g

Explanation:

Let's consider the reduction of Au³⁺ to Au.

Au³⁺(aq) + 3 e⁻ → Au(s)

In order to find the mass of gold produced, we will use the following relations.

The mass of gold produced when 15.1 A of current are passed through a gold solution for 31.0 min is:

\(31.0min \times \frac{60s}{1min} \times \frac{15.1C}{s} \times \frac{1mole^{-} }{96,468C} \times \frac{3molAu}{1mole^{-} } \times \frac{196.97gAu}{1molAu} = 172 gAu\)

It is incorporated with audio equipment to enhance sound quality. Diamonds are hard and easily vibrate at fast speeds, which results in high-quality sound. High-end recorders and DJ equipment both use it. Nanodiamonds have potential health benefits.

The carbon atoms in diamond are organised in a diamond cubic crystal lattice, making it an allotrope of carbon. Diamond is the material with the highest heat conductivity and hardness among all naturally occurring substances. Diamond is a particularly important component of industrial cutting and polishing equipment due to its unique qualities.

These days, diamond exfoliators and face products are accessible. Diamond dust is now being used in cosmetics, thus the price will undoubtedly be exorbitant. Diamond is used in beauty products to minimize wrinkles, etc.

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Answer:

A) Using the ideal gas law, we can calculate the number of moles of gas present:

```

PV = nRT

```

where:

* P = pressure (atm) = 1 atm

* V = volume (L) = 5.6 L

* n = number of moles of gas

* R = ideal gas constant = 0.08206 L atm / mol K

* T = temperature (K) = 273.15 K

Solving for n, we get:

```

n = (P * V) / RT

```

```

n = (1 atm * 5.6 L) / (0.08206 L atm / mol K * 273.15 K)

```

```

n = 0.25 mol

```

Therefore, there are 0.25 moles of gas present.

B) The molar mass of the gas can be calculated by dividing the mass of the gas (8.0 g) by the number of moles of gas (0.25 mol):

```

Molar mass = Mass / n

```

```

Molar mass = 8.0 g / 0.25 mol

```

```

Molar mass = 32 g/mol

```

The molar mass of the gas is 32 g/mol.

C) The common atmospheric gas with a molar mass of 32 g/mol is oxygen (O2). Therefore, the gas that was collected is oxygen.

Explanation:

Answer:

14.9 mol

Explanation:

To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.

871 g × (1 mol / 58.44 g)

= 871/58.44 mol

≈ 14.9 mol

Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.

Explanation:

Aromatic nitrogen bonded to hydrogen, as found in pyrrole must be represented as [nH] ; thus imidazole is written in SMILES notation as n1c[nH]cc1 . When aromatic atoms are singly bonded to each other, such as in biphenyl, a single bond must be shown explicitly: c1ccccc1-c2ccccc2 .

The factor that  doesn’t change the resistance of a wire is pressure. option A.

Resistance is a conductor's capacity to thwart the passage of current. It is controlled by the interplay of the applied voltage and the electric current passing through it. The amount of opposition any object applies to the flow of electric current is referred to as resistance.

The ohm, a unit of measurement for resistance, is represented by the Greek letter omega. According to Ohm's law, the voltage across two places is precisely proportional to the current flowing through a conductor between them.

Hence option A is correct.

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missing part;

The pressure

The length of the resistor.

The thickness of the resistor.

The temperature of the conductor.

Based on the given concentration and volume of solutions, the molarity of the ions are as follows:

The molarity of a solution is the number of moles of the substance in a given volume of solution in litres.

Moles of [BrO3-] = 0.04M × 0.005 L = 0.0002 moles

Moles of [I-] = 0.01 M × 0.005 L = 0.00005 moles

Moles of [H+] = 0.1 M × 0.005 L = 0.0005 moles

Flask A:

total volume = 15 mL = 0.015 L

Molarity of [I-] = 0.00005/0.015

Molarity of [I-] = = 0.0033 M

Flask B:

Total volume = 10 mL = 0.01 L

Molarity of [BrO3-] = 0.0002/0.01

Molarity of [BrO3-] = 0.02 M

Molarity of [H+] = 0.0005/0.01

Molarity of [H+] = 0.05 M

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When the pressure is doubled and the temperature increases to 500 K, the volume of the fluorine gas is approximately 497 mL.

To determine the volume of fluorine gas when the pressure is doubled and the temperature increases, we can use the combined gas law. The combined gas law equation relates the initial and final states of a gas under different conditions. It can be written as:

(P1 × V1) / (T1) = (P2 × V2) / (T2)

Given:

P1 = 2 atm

V1 = 410 mL

T1 = 206 K

P2 = 2 atm × 2 = 4 atm (pressure is doubled)

T2 = 500 K (temperature increases)

We need to find V2, the final volume.

Substituting the given values into the combined gas law equation, we have:

(2 atm × 410 mL) / (206 K) = (4 atm × V2) / (500 K)

Cross-multiplying and simplifying the equation, we get:

(2 atm × 410 mL × 500 K) = (4 atm × V2 × 206 K)

Now, we can solve for V2:

V2 = (2 atm × 410 mL × 500 K) / (4 atm × 206 K)

V2 ≈ 497 mL

Therefore, when the pressure is doubled and the temperature increases to 500 K, the volume of the fluorine gas is approximately 497 mL.

It's important to note that we assumed the gas behaves ideally and followed the combined gas law equation. In reality, deviations from ideal gas behavior can occur at high pressures or low temperatures, so the calculated value is an approximation based on the ideal gas law..

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If two solutions are separated by a semipermeable membrane with one side 1.5 M NaCl solution and other side 0.5 M KBr solution. Here water will flow from the KBr solution to the NaCl solution because of the water concentration difference.

When two solutions are separated with a semipermeable membrane, the water will flow from lower solute concentrated side to higher solute concentrated side.

Lower solute concentration means the water content will be high and that states higher water concentration.

Higher solute concentration means the water content will be low and that states low water concentration.

The water will flow from higher concentration to lower till the equilibrium where both sides the water and solute concentration is same.

In this case, the lower solute concentration is the 0.5 M KBr solution and the higher solute concentration is the 1.5 M NaCl solution.

Therefore, water will tend to flow from the KBr solution to the NaCl solution.

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The decomposition of aspirin (acetylsalicylic acid,\(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)).

The decomposition of aspirin (acetylsalicylic acid, \(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)). To determine the moles of each product formed, we need to consider the balanced chemical equation for the reaction:

\(C_{9} H_{8} O_{4} = > C_{7} H_{6}O_{3} +CH_{3} COOH\)

From the equation, we can see that for every 1 mole of aspirin, 1 mole of salicylic acid and 1 mole of acetic acid are produced.

Therefore, the moles of salicylic acid and acetic acid formed will be equal to the number of moles of aspirin that decomposes. If we know the amount of aspirin in moles, we can directly calculate the moles of each product based on stoichiometry.

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Answer:

Calculate the density of sulfuric acid if 35.4 mL of the acid weighs 65.14 g.   d = 1.84 g/mL

Find the mass of 250.0 mL of benzene. The density of benzene is 0.8765 g/mL. g = (0.8765 g/mL) (250.0 mL) = 219.1 g

Explanation:

Brainliest please?

Answer:

They are more spread out.

Explanation:

The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.

Answer:

Explanation:

Explanation:

Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles