When we make observations or measurements in science this is called the​

The most likely reason why the potato chunks gained mass is that water entered the potato cells.

The process of Osmosis allows water to pass through the semi-permeable membrane of potato cells.

This happens when the potato cells have less water than the material around them which then leads to water entering the cells to balance the water concentration.

The potato cells will expand and have more mass as a result.

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Answer:

0.046 M

Explanation:

Molarity = mol solute/ L solution = 0.23 mol/ 5 L = 0.046 mol/L = 0.046 M

Answer:

????? questions there no question

Answer:

what

Explanation:

Answer:

B

Explanation:

Materials generally become warmer when they are "absorbed" by light, this statement is more detailed. So, the correct answer is "absorbed by them."

Explanation: When a material absorbs light, it receives energy from the light, which leads to an increase in temperature. When light is absorbed by a material, the energy of the light is transformed into internal energy in the material. The temperature of a material can increase as a result of this energy absorption.

This is due to the fact that the increased internal energy of the molecules in the material causes them to vibrate more quickly and hence results in a temperature rise.

The light reflects or transmits when it passes through the material. When light reflects off a surface, it bounces back in the opposite direction. Transmitted light travels through a material without being absorbed by it.

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The ability of an atom to draw in the shared pair of electrons is measured by its electronegativity. For calculating electronegativity, people frequently utilize the Pauling scale.

When an electron is added to a neutral atom in a gaseous state to create a negative ion, the energy of the atom changes (in units of kJ/mole). In essence, it conveys the atom's propensity to pick up an electron.

In the modern periodic table's 17th group, fluorine is located above chlorine. Despite having seven electrons in its valence shell, it is smaller than an atom of chlorine.

The electron density rises as a result. Fluorine has a higher electronegativity because of its high electron density, which can draw in a shared pair of electrons.

Therefore, The ability of an atom to draw in the shared pair of electrons is measured by its electronegativity. For calculating electronegativity, people frequently utilize the Pauling scale.

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Answer:through the conduction from magma to water and rocks

Explanation:

Mass =

\(\frac{force}{gravitational \: force}\)

\(mass = \frac{1.50 \times 10^{15}n }{9.8m.s^{2} } \\ = 1.53 \times 10^{14} kg\)

Answer:

One lone pair

Explanation:

If we follow the valence bond approach of looking at chemical bonding, then we have to consider the electronic configuration of Fe^3+ which is; [Ar] 3d5.

This means that we have three electrons available to combine with three fluorine atoms leaving one lone pair to form FeF3.

Hence, FeF3 has one lone pair of electrons.

Answer:

Explanation:

a) 202.4 g

b) 185.24 m

c) 0.13 dm

d) 6.91 L

e)0.0546 mol

f) 2.7 s

g) 42kg

h) 0

i) -0.11 g

j) -0.34 mL

Invented by Bernard Launy and Jeremie Metz, flaws in the system in terms of energy inputs and outputs is the overbalanced wheel in which spokes are attached

Energy is the ability to do work to cause changes in matter

The overbalanced wheel perpetual motion machine is one of the most commonly proposed perpetual motion machine designed and wheel is designed to turn clockwise just after the weighted spoke reaches the top of the wheel and the spoke flip outward to the right exerting the force downward toward the ground and some energy will be lost from friction as the mechanism rub on the inner spoke and more energy will be lost when it transferred into sound and thermal energy

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the half-reactions

cathode : Zn²⁺ (aq) + 2e⁻ ---> Zn (s)  

anode : Mg (s) → Mg²⁺ (aq) + 2e−

a balanced cell reaction

Zn²⁺(aq) + Mg(s)→ Zn(s) + Mg²⁺ (aq)

Given

Zn and Mg electrodes

Required

The half-reactions for a galvanic cell

Solution

To determine the reaction of a voltaic cell, we must determine the metal that serves as the anode and the metal that serves as the cathode.

To determine this, we can either know from the standard potential value of the cell or use the voltaic series

1. voltaic series

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au

The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent

So the metal on the left will easily undergo oxidation and function as anode

Since Mg is located to the left of Zn, then Mg functions as anode and Zn as a cathode

2. Standard potentials cell of Mg and Zn metals :

Mg2+ + 2e– → Mg E° = -2,35 V

Zn2+ + 2e– → Zn E° = -0,78 V

The anode has a smaller E°, then Mg is the anode and Zn is the cathode.

Answer:

Explanation:help

Answer:

One of the key findings of the Kewalo Basin Marine Mammal Laboratory is that dolphins have complex social behaviors and are able to form strong bonds with other dolphins. They are able to communicate with each other using a variety of vocalizations and gestures, and they are also able to learn and mimic the behaviors of other dolphins.

Overall, the findings of the Kewalo Basin Marine Mammal Laboratory suggest that dolphins are highly intelligent animals with advanced social and cognitive abilities. These findings highlight the need for further research on dolphin intelligence and the importance of protecting these intelligent and fascinating animals.

Answer:

Adult tickets = A (cost $8)

student tickets = S (cost $4)

8(80) + 4(60) = 880

Explanation:

Substitution.

Adult tickets = A (cost $8)

student tickets = S (cost $4)

The drama class sold 20 more adult tickets than student tickets:

A = S + 20 (equation 1)

The class collected $880 from tickets:

8A + 4S = 880 (equation 2)

How many adult tickets were sold?

A = S + 20

8A + 4S = 880

we substitute the first equation into the second:

8(S+20) + 4S = 880  

8S + 160 + 4S = 880

12S = 720

S = 60

Next we find the adult tickets by substituting back:

A = S + 20

A = 60 + 20

A = 80

Check our answer by substituting our answers in equation 2:

8A + 4S = 880 (equation 2)

8(80) + 4(60) = 880

640 + 240 = 880

880 = 880

Answer:

0.0500

Explanation:

The distance travelled by the particle between 0 seconds and 6 seconds is 12 m

Velocity is simply defined as the rate of change of displacement with time. Mathematically, it can be expressed as:

Velocity = displacement / time

From the question given above, the following data were obtained:

Velocity = displacement / time

The displacement of the object between 0 and 6 s is calculated as;

2 = displacement / 6

Cross multiply

Displacement = 2 × 6

Displacement = 12 m

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One of the first ten compounds, carbon tetrachloride, is used in a variety of industrial manufacturing processes as well as in consumer products such as paints, adhesives, degreasers, and other things.

An organic molecule called carbon tetrachloride is made up of a core carbon atom that is encircled by four chlorine atoms arranged in a tetrahedron. Because of its extremely low melting point, it is found as a colorless liquid at ambient temperature. It has a wide range of uses, including in cleaning supplies, fire extinguishers, and fumigants. It has been discovered that large amounts of it can have negative health effects.

A substance's solubility refers to its capacity to dissolve in a certain solvent. The fundamental solubility rule tells us whether a given item dissolves in

It is a clear liquid that has a faintly perceptible sweet odor. It is also known as benziform, perchloromethane, methane tetrachloride, carbon chloride, and methane tetrachloride. The most common way to encounter carbon tetrachloride is as a colorless gas in the air. Both its inflammability and ease of dissolution in water are nonexistent.

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Answer:

The sun

Explanation:

Because plants use sunlight to conduct photosynthesis which is the process the need to create energy

When 178.9 grams of CuO are consumed, 0.75 moles of N2 can be produced.

The mole is the most practical unit for counting particles. According to the balanced chemical equation, 1 mole of nitrogen combines with 3 moles of hydrogen to form 2 moles of ammonia when each coefficient is multiplied by a mole.

To translate from grams to moles, we can utilize the molar mass of CuO:

Molar mass of CuO = 63.5 + 16 = 79.5 g/mol

Number of moles of CuO = 178.9 g / 79.5 g/mol = 2.25 mol

To determine how many moles of N2 may be created from 2.25 moles of CuO, we can apply stoichiometry as follows:

2.25 mol CuO x (1 mol N2 / 3 mol CuO) = 0.75 mol N2

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Answer:

18km

Explanation:

5km+2km+9km+2km=18km

Add up all the distances... :)

Assuming that 1.0 g of Compound A is consumed in a reaction with more than 1.0 g of Compound B, which produces only one product, Compound C then this reaction is called as stoichiometry reaction.

Because the reaction yields only one product, Compound C, the mass of Compound C produced can be calculated using the reaction's stoichiometry. If the balanced chemical equation for the reaction is: A + B C, where A and B are the reactants and C is the product, then the reaction stoichiometry is: 1 mole A + 1 mole B 1 mole C.

We can convert the masses of A and B into moles using the molar masses of the compounds:

mass A / molar mass = moles A A mole B = mass B divided by molar mass B

Because Compound B is in excess, we can assume that it will all react and be consumed in the reaction.

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Answer:

A is its answer

Explanation:

Fan uses electrical energy and makes it to mechanical energy by rotating

Same is with the drill

Trampoline does not use electrical energy

Lamp uses electrical energy but it converts it into light energy and heat energy

So A is the answer

Answer:

The happiness that we get by doing these things is a very beautiful experience. I feel happy when I help my mother in her kitchen work, water the plants, eat my favorite dish, go for a walk, listen to music, play with pets, spend time with family, gossip with friends,

~its srishty~✿

Rutherford's model of atom could not explain chemical properties as it did not make any mention as to how chemical changes take place.

These properties are defined as those properties which become evident during or after a chemical reaction after the identity of the substance is changed during chemical reaction.

These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and for building up chemical classifications.

The major chemical properties are flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.

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The resulting product of the reaction is two molecules of the thiol R-CH2-SH. The reaction is widely used in the reduction of disulfide bonds of proteins.

The reaction mechanism for the reduction of disulfide linkage and resulting product when reacted with DTT is given below:

Step 1: The first step involves the nucleophilic attack of a thiolate ion (-S⁻) from DTT on one of the sulfur atoms in the disulfide linkage. The sulfur-sulfur bond in the disulfide linkage is polarized due to the difference in the electronegativity of sulfur. Hence, one sulfur atom is slightly more electronegative and negatively charged than the other sulfur atom.

Therefore, the thiolate ion attacks the more positively charged sulfur atom of the disulfide bond. As a result, the sulfur-sulfur bond is broken and the thiolate ion forms a covalent bond with one of the sulfur atoms. This step is an example of a nucleophilic substitution reaction.  

R-CH2-S-S-CH2-R + 2DTT → R-CH2-S-DTT + DTT-S-CH2-R

Step 2: The second step involves the attack of another thiolate ion from DTT on the remaining sulfur atom of the disulfide bond. The thiolate ion attacks the sulfur atom to which the first thiolate ion is already attached. This step is an example of a nucleophilic substitution reaction.

As a result, a new covalent bond is formed between the sulfur atom and the thiolate ion, and the disulfide bond is completely broken.  

R-CH2-S-DTT + DTT-S-CH2-R → 2R-CH2-SH

The resulting product of the reaction is two molecules of the thiol R-CH2-SH. The reaction is widely used in the reduction of disulfide bonds of proteins.

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To make a 48% solution from 25 g of solute, you would need approximately 52.08 mL of solvent.

To calculate the volume of solvent required, we need to consider the mass percent of the solution. The mass percent is defined as the ratio of the mass of solute to the total mass of the solution, multiplied by 100. In this case, the mass percent is given as 48%.

To find the volume of solvent, we can set up a proportion using the mass percent. Let's assume the total volume of the solution is V mL. We can set up the following equation:

(25 g)/(V mL) = (48 g)/(100 mL)

Cross-multiplying and solving for V, we get:

25V = 48 * 100

V = (48 * 100)/25

V ≈ 192 mL

Therefore, you would need approximately 192 mL of the solvent to make a 48% solution from 25 g of solute.

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The size of micropipette that you would select to deliver 215 microliters would be a micropipette with a volume range of 200-1000 microliters.

What is a micropipette?

A micropipette is a laboratory instrument used to measure and dispense small volumes of liquid, typically in the range of microliters (µL) or nanoliters (nL). They are commonly used in chemistry, biology, and biochemistry experiments, as well as in clinical and industrial settings.

Micropipettes consist of a handle, a digital or manual volume adjustment mechanism, and a tip that is placed into the liquid to be dispensed. They work by creating a vacuum or positive pressure inside the tip, which draws or pushes the liquid out of the tip.

Micropipettes come in different volume ranges and it is important to select the right one to ensure accurate delivery of the desired volume. For example, a micropipette with a volume range of 2-10 microliters would not be suitable for delivering 215 microliters, while a micropipette with a volume range of 200-1000 microliters would be more appropriate.

It's also important to note that, even if the micropipette is able to deliver 215 microliters, you should always check the calibration of the micropipette before use, to make sure that it's delivering the correct volume.

Hence, a micropipette with a volume range of 200-1000 microliters is suitable to deliver 215 microliters.

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Answer:

Transparent Rock Crystal has many electronic uses; it is used as oscillators in radios, watches, and pressure gauges, and in the study of optics. Quartz is also used as an abrasive for sandblasting, grinding glass, and cutting soft stones.

Explanation:

At a pH of 4.0, the environment would be acidic and the histidine residue would be protonated because the pH is lower than the pKa of its functional group (which is approximately 6.0).

The ionisation state of amino acid residues, particularly histidine, can be critical for enzyme performance. The histidine residue's protonation status can alter its capacity to interact with other residues or substrates in the enzyme's active site. As a result, a histidine residue in an enzyme at a low pH of 4.0 would most likely be protonated, altering its catalytic characteristics and perhaps affecting the enzyme's overall activity.

Amino acids are chemical compounds that are used to construct proteins. There are 20 different amino acids found in proteins, each with its own side chain that defines its chemical and physical properties.

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