12. A beginner's bowling ball has a mass of 4.9 kg and a volume of 5.4 liters. Will it float in water,
which has a density of 1.0 g/mL?

Answer:

The pH scale is used to measure the acidity or basicity of a substance.

Explanation:

pH stands for potential hydrogen. It ranges from 0 to 14, 7 being neutral. The pH of water is 7 i.e. it is neither acidic nor basic. 0 to 7 shows acidic behavior while 7 to 14 shows basic behavior.

Experiment:

Dip the pH paper in the liquid and wait for ten seconds. The pH strip starts to discolor.

For a strong acid the strip will turn red.

For a weak acid the strip will become pale red.

To find the correct pH value we can compare it with the indicator scale present on the pH scale box.

The scale used to measure the basicity of a substance is called the pH scale.

The pH scale is a logarithmic scale that ranges from 0 to 14 and is used to determine the acidity or basicity of a solution. A pH value of 7 is considered neutral, values below 7 are acidic, and values above 7 are basic.

To differentiate a weak base from a strong one, you can perform the following experiments:

pH Measurement: Measure the pH of the solution containing the base using a pH meter or pH indicator paper. A strong base will have a higher pH value, typically around 12-14, indicating a highly basic solution. A weak base will have a lower pH value, closer to 7, indicating a less basic or slightly basic solution.

Conductivity Test: Dissolve a small amount of the base in water and measure its electrical conductivity using a conductivity meter. Strong bases are good electrolytes and will conduct electricity well, resulting in a high conductivity. Weak bases, on the other hand, are poor electrolytes and will exhibit lower conductivity.

Reaction with Acids: Add a few drops of a strong acid, such as hydrochloric acid (HCl), to a solution containing the base. Strong bases will rapidly and completely neutralize the acid, resulting in a significant increase in pH. Weak bases, however, will only partially neutralize the acid, leading to a smaller increase in pH.

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Answer:50

Explanation:

Kr has 36 protons because that is its atomic number. Simple subtraction from the given AMU gets 50 protons. (\(86-36=50\))

Answer:

Neutron Number (N) 50

(I think)

Boyle's law states that If the pressure on a gas is increased, then its volume will decrease because the gas molecules will gets closely packed at high pressure.

According to Boyle's law, at constant temperature the volume of a gas is inversely  proportional to the pressure. Therefore, as the pressure is increased, volume of the gas is decreased.

The volume of a gas is the total space it occupied . The gaseous particles can diffuse anywhere at low pressure and they not collide each other at this maximum spreading condition.

When the pressure is increased, the force of intermolecular attraction  increases make them more compressed and the space occupied by them that is the volume of the gas reduces.

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Answer:

What is the effect of ✔ pressure on the volume of a gas?

Explanation:

edge 2023

Answer:

dic

Explanation:

While picking up a buret, an unknown solution left by a previous solution drips onto your hand - Gloves

While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor - Closed-toe shoes

While checking on a stirring solution, the solution splashes up towards your face - Goggles

While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench - Lab coat

Explanation:

So, according to the question. the matches will be:

While picking up a buret, an unknown solution left by a previous solution drips onto your hand - Gloves

While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor - Closed-toe shoes

While checking on a stirring solution, the solution splashes up towards your face - Goggles

While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench - Lab coat

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Answer:

C. Oxygen

Explanation:

By looking at the periodic table.

As you look from left to right of the periods the electronegativity increases.

As well as from the bottom to the top of the groups it increases.

Answer:

Covalent bond

Explanation:

(pls give me brainliest) <3

The standard Gibbs free energy of reaction (ΔG°) is approximately -36.9 kJ/mol.

To calculate the standard Gibbs free energy of reaction (ΔG°) using the equilibrium constant (K), we can use the following equation:

ΔG° = -RT ln(K)

Where:

ΔG° = standard Gibbs free energy of reaction

R = gas constant (8.314 J/mol·K)

T = temperature in Kelvin

ln = natural logarithm

K = equilibrium constant

K = 5.9 × 10^6

T = 25.0°C = 298.15 K

Substituting the values into the equation:

ΔG° = - (8.314 J/mol·K) × 298.15 K × ln(5.9 × 10^6)

Calculating this using a calculator:

ΔG° ≈ - (8.314 J/mol·K) × 298.15 K × ln(5.9 × 10^6)

    ≈ - (8.314 J/mol·K) × 298.15 K × 15.592

ΔG° ≈ - 36876.49 J/mol ≈ -36.9 kJ/mol

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In cold weather, battery performance decreases dramatically because of a slowdown of the chemical reaction process.

Batteries rely on chemical reactions to generate power. The reactions rely on ions and electrons moving through the electrolyte and electrodes. As temperature drops, the chemical reaction rate slows down, reducing the amount of power that the battery can produce.

Thus, in cold weather, the battery performance decreases dramatically because of a slowdown of the chemical reaction process. Therefore, it is essential to keep batteries warm and ensure that they are sufficiently charged during cold weather.

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Among the given ions, ni2, mn3, nb3, and ru3, only ni2 cannot form both high-spin and low-spin octahedral complexes.

The concept of high-spin and low-spin octahedral complexes is related to the coordination chemistry of transition metal ions. It is determined by the number of unpaired electrons in the d-orbitals of the metal ion and the ligand field strength around the metal ion. High-spin complexes have unpaired electrons and are characterized by weak ligand fields, while low-spin complexes have paired electrons and are characterized by strong ligand fields.
The reason behind this is that the electronic configuration of Ni2+ is d8, which means it has two unpaired electrons. So, it can undergo either high-spin or low-spin complexes, depending on the ligand field strength. However, in the case of a perfectly spherical octahedral ligand field, ni2 cannot form a low-spin complex due to the Pauli exclusion principle.
In contrast, mn3, nb3, and ru3 can form both high-spin and low-spin octahedral complexes because they have unpaired electrons in their d-orbitals and are not subjected to the Pauli exclusion principle. So, depending on the strength of the ligand field, they can undergo either high-spin or low-spin complexes.
In summary, ni2 is the only ion among the given choices that cannot form both high-spin and low-spin octahedral complexes due to its d8 electronic configuration and the Pauli exclusion principle.

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Answer:  6.022 × 10²³

Explanation:

Avogadro's Number (6.022 × 10²³ atoms/mole) is the number of atoms in any mole of a substance.

Electron orbits the nucleus.

The electric charge of the electron, a subatomic particle, is a negative one elementary charge. Due to their lack of known components or substructure, electrons, which are part of the first generation of the lepton particle family, are typically considered to be elementary particles. The proton's mass is around 1836 times greater than that of the electron.

The electron's inherent angular momentum (spin), which is measured in terms of the scaled-down Planck constant,, is one of its quantum mechanical properties. The Pauli exclusion principle states that because electrons are fermions, no two of them may be in the same quantum state. Since they can collide with other particles and can be diffracted like light, electrons share characteristics with all elementary particles.

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Answer: He's right

Explanation: A. the electron

mark me brainliest

Explanation:

K. from Latin name kalium

The chemical equation that depicts a balanced chemical reaction is the one in choice B.

In this choice, the same number of atoms of each elements is in both, reactants and products sides, which means that the law of conservation of mass is fulfilled.

The correct answer is choice B.

430.0 kcal of heat must be added to the unknown substance to warm it from 22.0C to 70.4C. To determine this we need to use the formula: q = mcΔT

where q is the amount of heat required, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.

Substituting the given values, we get:
q = (8.0 kg) x (3.64 J/gC) x (70.4C - 22.0C)
q = 1.80 x 10⁶ J

To convert this to kcal, we need to divide by 4.184:
q = 430.0 kcal

Therefore, 430.0 kcal of heat must be added to the unknown substance to warm it from 22.0C to 70.4C.

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Option D Nitrogen dioxide.This sample has the lowest density.

Atmospheric pressure also called atmospheric pressure after the barometer is the pressure in the Earth's atmosphere. A standard atmosphere is a unit of pressure defined as 101,325 Pa equivalent to 1013.25 millibars, 760 mm Hg, 29.9212 inches Hg, or 14.696 psi.

Atmospheric pressure decreases with altitude. 1 atm is a unit of pressure equal to the pressure exerted by air at a temperature of 15 degrees above sea level, averaged. One atmosphere is also equivalent to 1,013 millibars or 760 millimeters of mercury.

Atmospheric pressure is measured with a barometer using a silicon capacitive pressure sensor with excellent repeatability and long-term stability.

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Answer: Ammonia

Explanation:

The bond order is a measure of the number of chemical bonds between two atoms in a molecule. It is determined by the difference between the number of bonding electrons and the number of antibonding electrons, divided by 2.

For B₂ (diatomic boron), the molecular orbital diagram shows that there are two bonding electrons and no antibonding electrons. Thus, the bond order is:

Bond Order = (Number of Bonding Electrons - Number of Antibonding Electrons) / 2

= (2 - 0) / 2

= 1

Therefore, the bond order of B₂ is 1.

For B₂⁺ (diatomic boron cation), one electron is removed from the molecular orbital diagram of B₂. Consequently, there is now one fewer electron in the bonding orbital. Hence, the bond order for B₂⁺ is:

Bond Order = (Number of Bonding Electrons - Number of Antibonding Electrons) / 2

= (1 - 0) / 2

= 0.5

Therefore, the bond order of B₂⁺ is 0.5.

A higher bond order indicates a stronger bond and a shorter bond length. Therefore, B₂ with a bond order of 1 has a stronger bond and a shorter bond length compared to B₂⁺ with a bond order of 0.5.

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Explanation:

W= F×d

W=29×6

W=174J or 174Nm

Answer:

Positive feedback

Explanation:

If the temperature on Earth starts to lower then a "positive feedback" will start to begin trying to make Earth heat up.

Clouds can trap that heat from the Sun therefore the clouds wrap Earth in a blanket. Therefore clouds have both a cooling effect as well as a warming effect.

Solar radiation makes it from our sun to the Earth and through the atmosphere. Solar radiation refers to electromagnetic waves or light. Solar radiation comes in three major classes: visible light, infrared light, and ultraviolet light.

The full electromagnetic spectrum features 7 types of light from lowest frequency to highest: radio waves, microwaves, infrared light, visible light, UV light, X-rays, and γ-rays. The ozone layer in the atmosphere prevents the passage of UV light through it.

The human eyeball can only detect visible light. The ultraviolet, "beyond violet," is invisible. The solar radiation coming from the sun can increase the temperature of the earth. The clouds prevent them to reach the surface. Therefore, it is positive feedback.

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The tangent line is a line that has the same slope as the curve at a single point.

The instantaneous rate of change is the slope of the tangent to the curve at a specific point, the slope of the tangent being the value of the rate of change at that time. A tangent is a straight line that touches a curve at a single point. The slope of the curve at that point is the same as the slope of the tangent at that point. The tangent line is a line that has the same slope as the curve at a single point. Therefore, by finding the slope of the tangent line, you can determine the instantaneous rate of change.The slope of a tangent to a curve at a specific point is calculated as follows;1. First, plot a graph of the data, with time on the x-axis and concentration on the y-axis.2. Pick a point on the curve.3. Draw a tangent line at that point.4. Find the slope of the tangent line.5. Repeat steps 2-4 for other points on the curve to obtain on how to find the instantaneous rate of change from a graph in chemistry.

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When handling the sodium hydroxide solution in this experiment, a safety concern would be to wear lab gloves to protect your skin from the corrosive effects of the hydroxide. Additionally, it is important to use the solution in a fume hood to minimize exposure to harmful vapors.

The safety concern when handling the sodium hydroxide solution used in this experiment would be to wear lab gloves.Sodium hydroxide is a strong base that can cause chemical burns and skin irritation upon contact. It can also cause eye damage and respiratory irritation if inhaled. Therefore, it is important to handle it with care and take proper precautions to avoid any accidents or injuries.Wearing lab gloves is one of the important safety measures when handling sodium hydroxide solution. Lab gloves provide a barrier between the skin and the chemical, reducing the risk of skin irritation or burns. Gloves made of nitrile, neoprene, or other chemical-resistant materials are recommended for handling sodium hydroxide solution.While it is also important to keep sodium hydroxide solution away from open flames and only use it in a fume hood to avoid inhalation of fumes, these precautions are not the primary safety concern when handling the chemical. The most important safety measure is to wear appropriate personal protective equipment, such as lab gloves, to protect against contact with the chemical.

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When 49.4 mL of the 0.721 M lead(II) nitrate reacts with the 99.6 mL of 0.807 M the sodium chloride, 0.830 kJ of the heat is released at constant pressure. The ΔH°  for this reaction is 20.81 kJ/mol.

The molarity of the NaCl = 0.807 M

The volume of NaCl = 49.4 mL

The moles = molarity × volume in L

The moles = 0.0398 mol

The molarity of the  lead(II) nitrate = 0.721 M

The volume of  lead(II) nitrate = 99.6 mL

The moles = molarity × volume in L

The moles = 0.0718 mol

The equation is as :

Pb(NO₃)₂(aq) + 2NaCl(aq) → PbCl₂(s) + 2NaNO₃(aq)

1 mole of the Pb(NO₃)₂ reaction with the 2 mole of the NaCl

The mole of the NaCl = 0.143 mol

The NaCl is the limiting reactant.

The heat, q = 0.830 kJ

ΔH° = q / n

ΔH° = 0.830 / 0.0398

ΔH° = 20.81 kJ/mol.

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Answer:

proton-27

electron-25

neutron-35

Explanation:

Zinc sulfide (or zinc sulphide) is an inorganic compound with the chemical formula of ZnS. This is the main form of zinc found in nature, where it mainly occurs as the mineral sphalerite.

im pretty sure its B

Explanation: also pretty sure we might be from the same class-

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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The molality of the solution is 0.0131 mol/kg and the boiling point of the solution is 80.10 °C.

To answer the questions about the freezing point and boiling point of the solutions, we need to use the freezing point depression and boiling point elevation equations. These equations relate the change in temperature to the molality of the solution and the respective constants.

Freezing Point Depression Equation:

ΔTf = -Kf * m

Boiling Point Elevation Equation:

ΔTb = Kb * m

where:

ΔTf = change in freezing point

ΔTb = change in boiling point

Kf = freezing point constant (given for water)

Kb = boiling point constant (given for benzene)

m = molality of the solution

Given:

For the antifreeze solution (water + ethylene glycol):

Mass of ethylene glycol = 10.39 g

Molar mass of ethylene glycol (CH2OHCH2OH) = 62.10 g/mol

Mass of water = 263.0 g

For the estrogen solution (benzene + estrogen):

Mass of estrogen = 13.37 g

Molar mass of estrogen (C1H24O2) = 272.4 g/mol

Mass of benzene = 291.9 g

To find the molality (m) of the solution, we need to calculate the moles of solute and solvent.

1. Antifreeze Solution (Water + Ethylene Glycol):

Moles of ethylene glycol = Mass of ethylene glycol / Molar mass of ethylene glycol

                             = 10.39 g / 62.10 g/mol

                             ≈ 0.167 mol

Moles of water = Mass of water / Molar mass of water

                   = 263.0 g / 18.015 g/mol

                   ≈ 14.58 mol

Molality (m) of the solution = Moles of solute / Mass of solvent (in kg)

                                   = 0.167 mol / 14.58 kg

                                   ≈ 0.0115 mol/kg

Using the freezing point depression equation:

ΔTf = -Kf * m

Substituting the values:

ΔTf = -1.86 °C/molal * 0.0115 mol/kg

       ≈ -0.0214 °C

The freezing point of the solution is given by:

Freezing point of water - ΔTf

0.00 °C - (-0.0214 °C)

≈ 0.0214 °C

Therefore, the freezing point of the antifreeze solution is approximately 0.0214 °C.

2. Estrogen Solution (Benzene + Estrogen):

Moles of estrogen = Mass of estrogen / Molar mass of estrogen

                        = 13.37 g / 272.4 g/mol

                        ≈ 0.049 mol

Moles of benzene = Mass of benzene / Molar mass of benzene

                    = 291.9 g / 78.11 g/mol

                    ≈ 3.739 mol

Molality (m) of the solution = Moles of solute / Mass of solvent (in kg)

                                  = 0.049 mol / 3.739 kg

                                  ≈ 0.0131 mol/kg

Using the boiling point elevation equation:

ΔTb = Kb * m

Substituting the values:

ΔTb = 2.53 °C/molal * 0.0131 mol/kg

       ≈ 0.0331 °C

The boiling point of the solution is given by:

Boiling point of benzene + ΔTb

80.10 °C.

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Answer: 157.8 g

Explanation: I hope this help my child UwU

What is the weight of the ethyl alcohol that exactly fills a 200.0 mL container the density of ethyl alcohol is 0.789 g ml?

Density review

A

B

What is the weight of the ethyl alcohol that exactly fills a 200.0 mL container? The density of ethyl alcohol is 0.789 g/mL.

g = (0.789 g/mL) (200.0 mL) = 158 g

Answer:

\(\boxed {\tt 197.25 \ grams }\)

Explanation:

The density formula is:

\(d=\frac{m}{v}\)

Rearrange the formula for m, the mass. Multiply both sides of the equation by v.

\(d*v=\frac{m}{v} *v\)

\(d*v=m\)

Mass can be found by multiplying the density and volume. The density of ethyl alcohol is 0.789 grams per milliliter. The alcohol fills a 250 milliliter graduated cylinder, so the volume is 250 milliliters.

\(d= 0.789 \ g/mL \\v= 250 mL\)

Substitute the values into the formula.

\(0.789 \ g/mL * 250 \ mL=m\)

Multiply. Note that the milliliters, or mL will cancel each other out.

\(0.789 \ g * 250=m\)

\(197.25 \ g=m\)

The mass of the ethyl alcohol is 197.25 grams.