The question is in the attached screenshot. Thanks a lot

Answer:

the ice cream falls down..therefore, it's kinetic energy while the melting part is heat energy

Answer: movement of Tectonic plates

Explanation: The tectonic plates are moving apart, on to the west and one to the east. As the plates move apart, volcanoes erupt and rift valleys are filled. During these events, earthquakes are common and magma rises up, creating a new oceanic crust.  

A cleaning solution with an OH⁻ concentration of 2.5 × 10⁻⁴ mol/L, has a pH of 10.4 and is basic (options b and c).

The hydroxide ion concentration is 2.5 × 10⁻⁴ mol/L.

pOH = -log [OH⁻] = log (2.5 × 10⁻⁴) = 3.6

We will use the following expression.

pH + pOH = 14

pH = 14 - pOH = 14 - 3.6 = 10.4

Since pH > 7, the solution is basic.

A cleaning solution with an OH⁻ concentration of 2.5 × 10⁻⁴ mol/L, has a pH of 10.4 and is basic (options b and c).

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0.4100 g - Rounding to four significant figures retains trailing zeros after the decimal point when followed by a non-zero digit.

Option (1) is correct.

In scientific notation, significant figures are digits that carry meaningful information about the precision of a measurement. When rounding a number to four significant figures, we consider the digits up to the fourth digit from the left (including trailing zeros after the decimal point).

In the given measurement, 0.41006 gram, we start counting from the left:

The first significant figure is "4."

The second significant figure is "1."

The third significant figure is "0."

The fourth significant figure is "0."

The fifth digit "6" is beyond the fourth significant figure, so we ignore it when rounding.

Since the fourth significant figure is "0," and it's followed by a digit greater than or equal to 5 (in this case, "6"), we round up the last significant figure. Hence, the measurement rounded to four significant figures is 0.4100 grams (option 1).

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Answer:

570.76 mmHg

Explanation:

multiply the atm value by 760.0 mmHg / atm.

760*.751=570.76

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Answer:

Thickness of foil = 0.004mm

Explanation:

V= length x width x height (height can also be known as the thickness 't')

0.5345=10.0 x (1.25÷10) x t

t=0.5345/10.0 x 12.5

t=0.004276mm

t=0.004mm

Answer:

See below

Explanation:

The equation shows    Al / Cl  = 2/3      or    3/2 Al = Cl

                                                                        3/2(20) = 30 Cl atoms needed

The equation shows a one-to-one relationship between Al and AlCl3

   produced     so if you use 20 Al atoms you get 20 AlCl3 molecules

The number of Cl₂ molecules needed to react with 20 aluminum atoms is approximately 11.97, and the number of units of aluminum chloride (AlCl₃) produced from 20 aluminum atoms is approximately 9.98.

Let's first calculate the number of molecules of chlorine gas (Cl₂) needed to react with 20 aluminum (Al) atoms:

From the balanced chemical equation: 2Al + 3Cl₂ ⟶ 2AlCl₃

The stoichiometric ratio between aluminum and chlorine gas is 2:3. This means for every 2 moles of aluminum, we need 3 moles of chlorine gas.

1 mole of any substance contains Avogadro's number (6.022 × 10²³) of particles (atoms, molecules, or ions).

Number of moles of aluminum (Al) atoms = 20 atoms / Avogadro's number

Number of moles of aluminum (Al) atoms = 20 / 6.022 × 10²³

Now, to find the number of molecules of chlorine gas (Cl₂) needed, we use the stoichiometric ratio:

Number of moles of chlorine gas (Cl₂) needed = (3/2) × Number of moles of aluminum (Al) atoms

Number of moles of chlorine gas (Cl₂) needed = (3/2) × (20 / 6.022 × 10²³)

Number of moles of chlorine gas (Cl₂) needed ≈ 1.988 × 10⁻²³ moles

Since 1 mole of any substance contains Avogadro's number of molecules, the number of molecules of chlorine gas (Cl₂) needed will be approximately:

Number of Cl₂ molecules ≈ 1.988 × 10⁻²³ × 6.022 × 10²³ ≈ 11.97

Now, let's calculate the number of units of aluminum chloride (AlCl₃) that can be produced from 20 aluminum (Al) atoms:

From the balanced chemical equation: 2Al + 3Cl₂ ⟶ 2AlCl₃

The stoichiometric ratio between aluminum and aluminum chloride (AlCl₃) is 2:2. This means for every 2 moles of aluminum, we get 2 moles of aluminum chloride.

Number of moles of aluminum chloride (AlCl₃) produced = Number of moles of aluminum (Al) atoms / 2

Number of moles of aluminum chloride (AlCl₃) produced = 20 / 2 / Avogadro's number

Number of moles of aluminum chloride (AlCl₃) produced ≈ 20 / (2 × 6.022 × 10²³)

Number of moles of aluminum chloride (AlCl₃) produced ≈ 1.658 × 10⁻²³ moles

Since 1 mole of any substance contains Avogadro's number of units (molecules or formula units), the number of units of aluminum chloride (AlCl₃) produced will be approximately:

Number of AlCl₃ units ≈ 1.658 × 10⁻²³ × 6.022 × 10²³ ≈ 9.98

Therefore, the number of Cl₂ molecules needed to react with 20 aluminum atoms is approximately 11.97, and the number of units of aluminum chloride (AlCl₃) produced from 20 aluminum atoms is approximately 9.98.

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Answer:

The chemical equation when Hexane is subjected to strong heat in the absence of air

Answer:

Answer is d, strength of London forces increases with molecular size.

Explanation:

Dispersion forces are the forces preesnt between all intermingling atoms, molecules and particles. Dispersion forces are the weakest intermolecular force, but they build up with the addition of more atoms, molecules or particles. Heat of vapourisation or boiling point is dependant on the energy required to break the bonds within the molecule/hydrocarbon in question. The build up of dispersion forces create greater intermolecular forces, which make the boiling of a substance more difficult. Hence increased hydrocarbon chain length, and the related increased eat of vapourisation is due to how the strength of the London/Dispersion forces increases with molecular size

Answer:

B.) an elephant having the same trunk sizes and shapes as its parents

Explanation:

an inherited trait is genetically determined. inherited traits are coded in our DNA and hence can be passed on to the next generation.

Answer:

72.6 mL

Explanation:

A quick way to solve this titration problem when you have a monoprotic acid is to use the Dilution equation, M1V1=M2V2.

.589(x)=.821(52.1)

X=72.6 mL

Answer:

In the total entropy of an isolated system, the thermal energy per unit temperature that is unavailable for doing useful work can never decrease.

Answer:

Tangible

Explanation:

Tangible alone means it is "perceptible by touch," meaning you physically observe the object with your sense of touch.

Having tangible motivation is like working for money or a trophy.

Explanation:

.

.mark it brainlist

Answer:

throughout the metallic structure allowing the atoms to slide past each other. This sliding is why metals are ductile and malleable. Ionic compound must break bonds to slide past one another, which causes the ionic material to split and crack.

Explanation:

Hope this helps loves mark me brianlest x

Answer:

from the ideal gas law, P2 /P1 = T2 /T1 for the same volume and quantity of gas. P2 = (758 mmHg) (45 +273 K) / (15 +273K) = 837 mmHg.

Explanation:

Its b beacuse if you C4 its a high active poly faber

Explanation:

Im right

Answer:

the awnser is d the other fuel produce more pollutants

Explanation:

because right out the bat we know that other  fuels produce more than a 15 percent fuel so the right awnser is d

Answer:

You will be able to watch the slow dissolution of the nail (probably a steel nail and not iron) and the change in colour of the solution.

Explanation:

I believe not 100% sure.

Answer:

it pops because the heat and water inside of it

Explanation:

Answer:

when the corn is heated, the water turns into steam, which builds pressure inside the kernel. When it can no longer contain the pressure it pops.

Explanation:

Answer:

The sand is much warmer than the water because water has a higher specific heat, or it takes more energy to change the temperature of water. Since they are absorbing energy from the same place, the sun, the sand will get warmer faster because it takes less energy to change the temperature.

Another reason could be because the water is constantly mixing with the water below it which is not exposed to the sun and because of this the water remains at a lower temperatre. The sand however has the same part exposed to the sun unless an external force, a foot, umbrella, wind, etc comes to move it. So it is able to absorb the sun for longer than the water.

Answer:

you work out the moles by finding the grand formula mass them you divide the actual mass by the grand formula mass: 25/160 (my grand formula mass is probably slightly different from yours) which I got 0.15625 then I times it by 32(O2) and I got 5. but my periodic table is different. it's whole numbers. ;-)

Explanation:

4.44

Answer:The more air we pump into them the more squished the air has to become to fit inside the ball. As the air becomes more squished, it pushes more on the inside of the ball. When you have a ball which is more inflated, there is more force pushing on the inside of that ball. (We call that air pressure).

Explanation:

The amount of gas causes the change in pressure when a basketball is pumped up. The force delivered perpendicularly to an object's surface per unit area across where that force is dispersed is known as pressure.

The force delivered perpendicularly to an object's surface per unit area across where that force is dispersed is known as pressure (symbol: p / P). The pressure proportional to the surrounding air is known as gauge pressure, also spelt gauge pressure[a].

Pressure is expressed using a variety of units. Some of them come from dividing a unit of force by a measure of area; the pound-force / square inch and the newton every square metre (N/m2) are two examples. The standard international measurement of pressure, a pascal (Pa), is another. The amount of gas causes the change in pressure when a basketball is pumped up.

Therefore, the amount of gas causes the change in pressure when a basketball is pumped up.

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A light can be treated like a particle because light comes in chunks of energy called photons.

Photons are the small packets of energy and its energy will be represented by the following equation as:

E = hυ, where

h = plank's constant

υ = frequency

Light will be treated like a wave as well as of particle due to presence of this type of energy.

Hence correct statement is light comes in chunks of energy called photons.

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Answer:

B. Light comes in chunks of energy called photons.

The products obtained from the reaction between HCl and NaOH are NaCl and H₂O

Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.

The reactants are located on the left side while the products are located on the right side.

Reactants —> Products

The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

The reaction between HCl and NaOH is a neutralization reaction which produces salt and water as shown below

HCl + NaOH → NaCl + H₂O

Products => NaCl and H₂O

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If the pH of the acid at a given time is found to be 1.25, then the molarity  of the gastric acid juice is 0.056M.

pH is define as the negative logarithm of the concentration of H⁺ ions present in any solution and it will be represented as:

pH = -log[H⁺]

Concentration will be present in the form of molarity and pH value for gastric acid is given 1.25 means it is strong acid as it completely dissociates into their ions.

Required equation for calculation will be:

[H⁺] = [tex]10^{-pH}[/tex]

[H⁺] = [tex]10^{-1.25}[/tex]

[H⁺] = 0.056 M

Hence molarity of the gastric acid juice is 0.056M.

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The minimum number of calories needed to change 40 g of water at 100°C to steam is 21600 calories

The heat needed to vaporise the water at 100 °C can be obtained as follow:

Q = m × ΔHv

Q = 40 × 540

Q = 21600 calories

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