An object of mass 3 kg floats motionless in a fluid of specific gravity 0.8

What is the magnitude of the buoyant force?

Answer:

student A

Explanation:

v = s ÷ t (speed = distance ÷ time)

v = 6m ÷ 2s

v = 3m/s

Answer:

A. 6atm

Explanation:

Using pressure law equation:

P1/T1 = P2/T2

Where;

P1 = initial pressure (atm)

T1 = initial temperature (K)

P2 = final pressure (atm)

T2 = final temperature (K)

According to this question;

P1 = 3 atm

P2 = ?

T1 = 120K

T2 = 240K

Using P1/T1 = P2/T2

3/120 = P2/240

Cross multiply

240 × 3 = P2 × 120

720 = 120P2

P2 = 720/120

P2 = 6atm

A mass of 12.5 grams of \(Na_2S_2O_3\) is needed to dissolve 4.7 g of AgBr in a solution volume of 1 L.

The balanced equation for the dissolution of AgBr is:

AgBr (s) ↔ \(Ag^+\) (aq) + \(Br^-\) (aq)

The solubility product expression for AgBr is:

Ksp =\([Ag^+][Br^-]\)= 3.3 x \(10^{-13}\)

The reaction between \(Ag^+\) and \(S_2O_3^{2-}\) is:

\(Ag^+\) (aq) + 2 \(S_2O_3^{2-}\) (aq) ↔ \([Ag(S_2O_3)_2]^{3-}\) (aq)

The reaction quotient for \([Ag(S_2O_3)_2]^{3-}\) is:

Kq = [\(Ag^+\)]\([S_2O_3^{2-}]^2\) / \([Ag(S_2O_3)_2]^{3-}\) = 4.7 x \(10^{13}\)

We can use the solubility product expression to find the concentration of \(Ag^+\) in the solution:

[\(Ag^+\)] = Ksp / \([Br^-]\) = 3.3 x \(10^{-13}\) / (4.7 g / 187.77 g/mol / 1 L) = 1.64 x \(10^{-10}\)M

We can then use the reaction quotient to find the concentration of \(S_2O_3^{2-}\) in the solution:

\([S_2O_3^{2-}]\) = √(Kq \([Ag(S_2O_3)_2]^{3-}\) / \([Ag^+]\)) = √(4.7 x \(10^{13}\) / 1.64 x \(10^{-10}\)) / 2 = 7.9 x \(10^{-2}\) M

Finally, we can use the concentration of \(S_2O_3^{2-}\) to find the mass of \(Na_2S_2O_3\) needed to dissolve the AgBr:

mass = concentration x volume x molar mass = 7.9 x \(10^{-2}\) M x 1 L x 158.11 g/mol = 12.5 g

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Answer:

Sunlight penetrates the top layers of the ocean, so photosynthesis occurs there.

Explanation:

Iron has a density of 7.87 g/cm³, so the mass of iron would be required to cover a football playing surface is 4.7×10⁷ g.

The density of an object is the relationship between mass and volume. For most substances, their solid form is denser than their liquid, but this is the opposite case for water.

Given:

The volume of the football field is the length times the width times the height, but all of these measurements must be converted to cm, using the conversions :

Let in is inches.

1 yard = 3 feet,

1 foot = 12 in,

1 in = 2.54 cm,

1 cm = 10 mm

Length = 120 yd (3ft/1yd ) (12 in/1 ft) (2.54 cm/1 in)

=1.1×10⁴ cm width

= 60 yd (3 ft/1 yd) (12 in/1 ft) (2.54 cm/1 in)

=5.5×10³ cm height

= 1 mm (1 cm/ 10 cm)

=0.10 cm volume

= 1.1×10⁴ cm × 5.5×10³ cm × 0.10 cm

=6×10⁶ cm³

mass= density * volume

= 7.87 g/cm3 × 6×10⁶ cm³

= 4.7×10⁷ g.

Therefore, the Mass of iron that would be required to cover a football playing surface is 4.7×10⁷ g.

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Answer:

The correct option is;

a. The particles will gain a large amount of kinetic energy

Explanation:

As the water temperature reaches 100°C, which is the boiling point for water at atmospheric pressure, the continued heating is then used to break up the strong inter molecular forces between molecules of the water  such that the individual molecules are free to move about and due to the high temperature, have gained considerable amount of kinetic energy for the to rise to appreciable height and to also spread.

The heat which converts water into steam is called latent heat as during the boiling phase, the temperature of the water remains constant.

The density of the liquid is 0.98 g/mL

The density of a substance is defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as:

Density = mass / volume

With the above formula, we can obtain the density of the liquid.

Density = mass / volume

Density of liquid = 30.8 / 31.5

Density of liquid = 0.98 g/mL

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Answer:

6

Explanation:

If there are 6 electrons and it has a balanced charge, there also must be six protons.

Answer:

C) Cl2

Explanation:

Water (H2O), Ammonia (NH3), and Hydrochloric aid (HCl) are all polar. Cl2 is the only non-polar out of the answers and the electrons are shared equally.

Answer:

radiation

Explanation:

Answer:

neither

Explanation:

Kinetic Energy is the physical movement of objects.

Answer:

I'm sorry, but I cannot see the observations or the data table you mentioned in your question. However, I can still provide you with some general guidance on how to approach the calculations and answer the questions based on the given information.

4. To calculate the concentration of the NaOH solution, you need to know the mass of NaOH used and the volume of the solution. The formula to calculate concentration is:

Concentration (in mol/L) = (Mass of NaOH (in grams) / molar mass of NaOH) / Volume of solution (in L)

Make sure to convert the mass of NaOH to moles by dividing it by the molar mass of NaOH. The molar mass of NaOH is the sum of the atomic masses of sodium (Na), oxygen (O), and hydrogen (H).

5. The balanced equation for the neutralization reaction between NaOH and HCl is:

NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

(aq) represents an aqueous solution, and (l) represents a liquid.

6a. To calculate the average concentration of HCl in the sample from site B, you need to know the volumes and concentrations of the NaOH and HCl solutions used in the titration. Use the formula:

Concentration of HCl (in mol/L) = (Volume of NaOH solution (in L) * Concentration of NaOH (in mol/L)) / Volume of HCl solution (in L)

Multiply the volume of NaOH solution used by its concentration to find the amount of NaOH used. Then, divide this amount by the volume of HCl solution used to find the concentration of HCl.

6b. To determine the pH of the water at site B, you need to know the concentration of HCl from the previous calculation. The pH can be calculated using the formula:

pH = -log10[H+]

Since HCl is a strong acid, it dissociates completely into H+ ions. Therefore, the concentration of H+ ions is equal to the concentration of HCl. Take the negative logarithm (base 10) of the H+ concentration to find the pH.

To check if the water is safe, compare the calculated pH value to the range provided (pH 4.5-7.5). If the pH falls within this range, the water is considered safe for plant and animal reproduction in an aquatic environment.

6c. Use a similar calculation as in 6a to determine the average concentration of HCl in the sample from site C.

6d. Use the concentration of HCl from 6c to calculate the pH using the formula in 6b. Follow the same procedure to check if the water is safe based on the pH range.

7. To find the most current pH value for the Grand River, you can search for the latest data from reliable sources such as environmental agencies, research institutions, or government websites. Compare this pH value to the pH values obtained in the experiment to assess the difference between them.

Remember, without the specific data and observations, the calculations and comparisons provided here are only general guidelines. It's important to use the actual data from your experiment to obtain accurate results and conclusions.

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Answer:

C

Explanation:

The rate of a reaction decreases as time progresses. ... If the amount of reactant particles is decreasing as the reaction progresses, then the chance of successful collisions must also decrease, and ultimately when all the reactant particles have reacted, the reaction must stop and the rate become zero.

Answer:

c

Explanation:

From a single fossil, scientists can directly gather information about the physical characteristics and morphology of the organism that left the fossil.Option B. What the organism looked like is the correct nswer.

Fossils can preserve various parts of an organism, such as bones, teeth, shells, or even imprints of soft tissues. By studying the fossil's structure, shape, and features, scientists can infer the appearance and anatomical details of the organism, including its size, shape, skeletal structure, and sometimes even its coloration or texture.

While scientists can make educated guesses about other aspects, such as how the organism is related to present-day organisms (A), its reproductive behavior (C), or the exact lifespan (D), these details are typically inferred through comparative studies, analysis of multiple fossils, and other lines of evidence.

However, directly from a single fossil, the most immediate and concrete information that can be obtained is about the physical characteristics and appearance of the organism (B).Option B is correct.

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(a) To get the pH of the media to 5.8, you would add NaOH solution. NaOH is used as a basic solution, and when it is added to a solution, it will increase the pH of the solution.

(b) The molecular weight of BA is 225.3. To prepare a 1M solution, you would have to weigh out 225.3 grams of BA.(c) To convert a 1M solution of BA to mg/mL, you can use the following equation: 1 mole = molecular weight in grams; 1000 millimoles = 1 mole. So, 1 M = 1000 mg/mL. Therefore, a 1M solution of BA is equivalent to 1000 mg/mL .(d) To convert a concentration of 1000 mg/mL .

Therefore, to calculate the weight required for a 5 mM solution, use the following formula :Mass of BA = molarity × volume × molecular weight= 5 × 0.001 × 225.3= 1.1265 grams(f) To convert a concentration of 5 mM to mg/mL, we use the following formula: Concentration (mg/mL) = (Concentration (mM) × Molecular weight) / 1000= (5 × 225.3) / 1000= 1.1265 mg/mL(g)

To convert a concentration of 1.1265 mg/mL to mg/L, we multiply by 1000, so 1.1265 mg/mL = 1126.5 mg/L.(h) Given that the stock solution of BA is 5 mM and the working solution is 0.2 mg/mL.

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Answer:

1 NaCl

Explanation:

Answer: 60.117 g

Explanation: \(1.5 mol Ca = \frac{40.078g/mol}{1mol}\) multiply and quit all "mol" and you get the grams

Answer:

c

Explanation:

C is the answer for increasing Atomic number

Based on the analysis above, we can rank the acids from most acidic to least acidic is:

1. CHCl₂COOH

2. CHF₂COOH

3. CH(CH₃)₂COOH

To rank the acids from most acidic to least acidic, we need to consider the stability of their conjugate bases. A more stable conjugate base indicates a stronger acid. The stability of the conjugate base can be influenced by several factors, including the inductive effect and the resonance effect.

1. CH(CH₃)₂COOH:

The presence of the two methyl groups (–CH₃) on the α-carbon of the carboxylic acid group increases electron density through the inductive effect. This electron-donating effect destabilizes the conjugate base, making it less stable.

2. CHF₂COOH:

The presence of the electronegative fluorine atom (–F) on the α-carbon of the carboxylic acid group withdraws electron density through the inductive effect. This electron-withdrawing effect stabilizes the conjugate base, making it more stable compared to CH(CH₃)₂COOH.

3. CHCl₂COOH:

The presence of the two chlorine atoms (–Cl) on the α-carbon of the carboxylic acid group also withdraws electron density through the inductive effect. This electron-withdrawing effect is stronger than the effect of a single fluorine atom. Therefore, CHCl₂COOH has a more stable conjugate base compared to CHF₂COOH.

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The complete question is:

Rank the following acids from most acidic to least acidic. Explain the ranking using the effects that lead to the stabilization of the conjugate base. CH(CH₃)₂COOH, CHF₂COOH, CHCl₂COOH.

The mass of an object on a triple- beam balance the three weights on the beam 100, 95, and 5 grams. then the density is 2.67 g / cm³.

Density is defined as the evaluation of how closely something is packed. Because it enables us to predict which compounds will float and which will sink in a liquid, density is a crucial notion.
Density can be expressed as

Density = mass / volume

Given

Mass = 100 + 95 + 5 /3

         = 200 / 3

         = 66.7 g

Volume = Initial volume - final volume

             = 50 - 75

             = 25 ml

Density = 66.7 / 25

             = 2.67 g / cm³

Thus, the mass of an object on a triple- beam balance the three weights on the beam 100, 95, and 5 grams. then the density is 2.67 g / cm³.

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Answer:

Explanation:

CaCO3 = 1*Ca + 1*C + 3*O

              =1*40 + 1*12 + 3*16

               =40 + 12 + 48

               =100 amu

Answer:

The nucleus of atom is composed of two subatomic particles that each have charges.

Both reside in the nucleus of an atom. The amount of protons and neutrons (Electrons can to) is what helps us identify each atom apart. Electrons are NOT in the nucleus of atom but orbit it in outer layers called orbitals.

The resulting element after the alpha decay of 230 90Th is 226 88Ra.

Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle, which consists of two protons and two neutrons. The parent nucleus, in this case, is 230 90Th, which means it has 90 protons and 140 neutrons.

When it undergoes alpha decay, it emits an alpha particle, which means it loses two protons and two neutrons. This reduces its atomic number by two and its mass number by four.

So, the resulting element has an atomic number of 88 (90 - 2) and a mass number of 226 (230 - 4), which corresponds to the element radium (Ra). Therefore, the resulting element after the alpha decay of 230 90Th is 226 88Ra.

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Answer:

laws:)

Explanation:

Answer:6969?

Explanation:

a. 0.6 moles

b. 35.1 grams

Given

Volume = 0.2 L

Molarity = 3 M

Required

mol of Sodium chloride

Solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

\(\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}\)

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

Input the value :

n = M x V

n = 3 M x 0.2 L

n = 0.6 moles

Mass of NaCl :

= mol x molar mass of NaCl

= 0.6 x 58.5 g/mol

= 35.1 grams

The osmolarity (osm) of a 0.5 M NaCl solution is 1 osm.

Osmolarity can be calculated by multiplying the molarity of the solution by the number of solute particles in the solution.

Next, we can CALCULATE the osmolarity of the solution using the formula:
osmolarity (osm) = molarity (M) x number of solute particles

osmolarity (osm) = 0.5 M x 2
osmolarity (osm) = 1 osm

Therefore, the osmolarity of a 0.5 M NaCl solution is 1 osm.

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Answer:

The hydroxide [OH-] concentration of the solution is 1.26*10⁻⁵ M.

Explanation:

The pOH (or potential OH) is a measure of the basicity or alkalinity of a solution.

POH indicates the concentration of hydroxyl ions [OH-] present in a solution and is defined as the negative logarithm of the activity of hydroxide ions (that is, the concentration of OH- ions):

pOH= -log [OH-]

A solution has a pOH of 4.90. Replacing in the definition of pOH:

4.90= -log [OH-]

Solving:

-4.90= log [OH-]

1.26*10⁻⁵ M= [OH-]

The hydroxide [OH-] concentration of the solution is 1.26*10⁻⁵ M.

Answer:

вау, это кажется сложным, но я все равно не знаю

Answer:

A

Explanation:

bc its right