Which TWO of the following changes can be classified as physical

A. Ice melting on a warm day

B. Fireworks going off on July 4th

C. Baking soda reacting with vinegar

D. Glass shattering as it hits the floor

The interactions between the solvent and the solute are either equal to or greater than the interactions between the solvent and the solute.

A solute can dissolve in a solvent to create a solution whether it is in a solid, liquid, or gaseous phase. A solute's solubility is the highest concentration that can dissolve in a solvent at a specific temperature.

Solvation is the scientific term for the interactions between solute particle and solvent molecule. Ions or molecules that are solvated are encircled by solvent. Photo from Wikimedia Commons of a sodium ion dissolved in water.

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Answer:

[tex]\huge\boxed{\sf 14}[/tex]

Explanation:

Atomic number = 13

Mass number = 27

= Mass number - Atomic number

= 27 - 13

[tex]\rule[225]{225}{2}[/tex]

Answer:

it is C. take it to the local automotive parts store to be recycled

Explanation:

hope this helped have a nice day!

The saltwater of the ocean creates the marine ecosystem. Freshwater bodies of water, such as lakes, ponds, streams, and rivers, make up the freshwater ecosystem.

What are ecosystems?

All the organisms and the physical setting they interact with make up an ecosystem. The nutrition cycles and energy flows connect these biotic and abiotic elements.

The marine biome, which makes up around 70% of the planet's surface, is the largest biome. On Earth, freshwater biomes make up about 20% of the land. The salt content distinguishes the two. They both have several aquatic animal species.

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The pressure in the burette if the atmospheric pressure in the room at that time was 765.0 torr is 717.44 torr.

Calculation:-

We know that density of water = 1g/mL

Given : Density of mercury = 13.6 g / mL

Also, 1 torr = 1mmHg

So 1 torr = 13.6 mm of H2O

So 1mm of water = 1/13.6 torr

Height of water given = 14.1 cm = 141 mm

so 14.1 cm = 141 / 13.6 torr = 10.36 torr

Atmospheric pressure = 753 torr

Therefore pressure of H2 and pressure of water column = 753 torr

Hence pressure of hydrogen = 753 - 10.36 = 742.64 torr

A further correction needs to be made because the H2 gas also contains water vapor.

We know from standard values that vapour pressure exerted by water at 26 0C = 25.2 Torr

So pressure of dry hydrogen  = Pressure of hydrogen - pressure of vapours = 742.64 - 25.2 = 717.44 torr

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B. 2-bromo-4-ethyl benzene carboxylic acid. The term "industrial chemical" is short form for "International Union of Pure and Applied Chemistry(iupac).

The IUPAC nomenclature is based on naming the longest continuous or ring-shaped chain of carbon atoms linked by a single bond within a given molecule. Prefixes or suffixes are used in accordance with a predetermined order to identify all deviations, including those involving multiple bonds or atoms other than carbon and hydrogen.

The base name is written first, then the name of the compound is spelt out in alphabetical order (derived from the number of carbons in the parent chain). The name has no spaces in it.

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The combined rate when Jack and Jill drink together at their respective speeds ,the bottle of cider will finish in 4 days.

A rate in mathematics is indeed the ratio of two related elements stated in different units.The numerator of the ratio indicates the equivalent rate of increase in the other (dependent) variable if the denominator is given as a single entity of one of these values and it is expected that this number may well be changed consistently (i.e., is an output factor).

Jill drinks in one day=  1/12 bottle

Jack consumes 1/6 bottle in a day.

Together they will drink = 1/12+1/6 = 3/12 = 1/4 bottle

"Per unit of time" is a prevalent rate unit that includes ideas like speed, heart rate, and flux.Electric field ratios, exchange rates, and literacy rates are non-time denominators Hence Jack and Jill will completely drink the bottle in 4 days .

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Answer:

Part A: One survival advantage for red squirrels to breed earlier in the spring is that they may be able to take advantage of an earlier availability of food resources. As the climate warms and average temperatures increase, plants may begin to grow and produce food earlier in the year. By breeding earlier in the spring, red squirrels may be able to access these food resources before they become scarce, which could improve the survival and reproductive success of their offspring.

Part B: The mechanism by which the gene for breeding earlier in the spring can increase in the red squirrel population over time is natural selection. Natural selection is the process by which certain traits become more or less common in a population based on their impact on an individual's ability to survive and reproduce. If red squirrels that breed earlier in the spring are more successful at surviving and reproducing than those that breed later, then the genes for early breeding will become more common in the population over time. This process can occur over many generations, leading to a shift in the distribution of the time of year breeding genes in the population.

The volume of a bar of soap that has a density of 2.5 g/cm3 and a mass of 100 g is 40 cm ³. Therefore, option D is correct.

The mass of a substance per unit of volume is its density. A mechanically accepted measure is density. Density is most frequently represented by the symbol, however the Latin letter D may also be used.

The mass of a solid substance's unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density.

Density = m / V

volume = mass / density

= 100 / 2.5

= 40 cm³

Thus, option D is correct.

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The element Zirconium has the given electronic configurations because its atomic number is 40 and its electrons are present in d subshell since it is a d block element.

Zr (Zirconium) is an element with atomic number 40 in the periodic table located in the V (fifth)  period having  melting point 1852 ℃. and density: 6.51 g/cm³. Electronic configuration of  Zirconium atom in ascending order of orbital energies:

1s² 2s² p⁶ 3s² p⁶ d¹⁰ 4s² p⁶ 5s²  4d²

The electronic configuration of the Zirconium atom in the ascending order of the levels:

1s² 2s² p⁶ 3s² p⁶ d¹⁰ 4s²p⁶d²  5s²

The reduced electronic configuration of Zr:

[Kr] 4d² 5s²

Therefore Zirconium atom is the element having given electronic configuration

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0.1218 M is the molarity of the solution

mole of Ca(oH)2 == mass/ molar mass

                          = 4.152/74.053

                         =0.060 g. mol

volume of the solution= 500ml

=500/1000

= 0.5 L

Molarity= mole/ litre

= 0.060 g mol/ 0.5L

= o.1218 M

The amount of a solute per unit volume of solution is how much a chemical entity is present in a solution, and this is known as its molar concentration. "The molarity of products is divided by the molarity of reactants" is the formula for determining an equilibrium constant.

in a experiment similar to yours, a solution is prepared by adding 4.512 g of slaked lime also known as calcium hydroxide to 500.00 ml of water. a. what is the molarity of the solution

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A student dissolves 2.45 g of sugar in 200.0 g water. the mass percent of sugar in the solution is 1.22 %.

given that :

the mass of the solute =  2.45 g

the mass of the solution = 200 g

The mass percent formula is given as follows :

The mass % = ( mass of solute / mass of the solution ) × 100 %

The mass %  = ( 2.45 / 200 ) × 100 %

The mass % = 1.22 %.

Thus the mass percent of the 2.45 g of sugar dissolves in 200 g of the water is 1.22 %.

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Red color element symbols indicate elements that are gases at a specific temperature in periodic scavenger hunts.

An element is a basic substance that is hard to break down into smaller pieces. In chemistry and physics, an element is anything that cannot be further separated by non-nuclear processes. In computers and mathematics, an element is a discrete part of a larger structure or collection.

Any compound that cannot be broken down into simpler chemicals by regular chemical processes is referred to as a chemical element or element. The building blocks from which every matter is made are called elements.

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Drip irrigation is the ideal irrigation system for use with vegetable gardens, flowers, trees, and other watering needs. A drip irrigation system for gardens helps you save time, money, and water.

In those pots lacking drainage holes, a layer of stones is used as a form of drainage layer. By using this method, surplus water might go from the soil and, consequently, the roots of your plant, into the area with the pebbles.

A drip system that has been set up correctly will operate automatically at a certain time of day for a specific duration.

Therefore, a) use the water to wash the car. b) Often used for transpiration to create a suction force, creating a transpiration pull. c) Ayan values water, conserving it and giving the most efficient and optimum function.

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In an experiment comparable to the one you conducted in the lab, it was discovered that the [Fe(SCN)2+] equilibrium concentration in a solution created by combining 7.0 mL was 2.510-5 M. The concentration of [Fe(SCN)]2+ is 2 104 M at equilibrium.

What is equilibrium constant's ?

The equilibrium constant's value. Fe is an excess reactant, whereas SCN is the limiting reactant. The reason for creating this reactant in excess is because, according to Le Chatelier's principle, this excess will cause the reaction to shift to the products side, causing the reaction to produce as much Fe(SCN) as possible.

As a result, the concentration of FeSCN2+ in the equilibrium mixture is roughly equal to the SCN- concentration that existed prior to the reaction.

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Answer: The higher the amplitude, the higher the energy.

Explanation: The higher the amplitude, the higher the energy. To summarise, waves carry energy. The amount of energy they carry is related to their frequency and their amplitude. The higher the frequency, the more energy, and the higher the amplitude, the more energy.

According to the law of conservation of mass and stoichiometry, number of moles of KCl produced along with 0.45 moles of oxygen is 2 moles of KCl.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

As according to the equation, 245.1 g of potassium chlorate produces 149.1 g of KCl and 48 g of oxygen

∴245.1 g of potassium chlorate produces 244.65 g of KCl  along with 7.2 g of oxygen .

In terms of moles, 2 moles of potassium chlorate produces 2 moles of KCl as number of moles=mass/molar mass that is, 149.1/74.55=2

Thus, the number of moles of KCl produced is 2 moles.

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Lipids are more of a fatty, oily, and waxy substance that serve as long-term energy for whenever the body may need it. You can find lipids in oily foods such as salad dressing, olives, avocados, peanut butter, nuts, seeds, and some fish.

Proteins are enzymes that are used to strengthen and keep the body functioning. Proteins make up our bones, hair, skin, nails, and muscle, and without them our bodies wouldn't be strong enough to function or carry out even the simplest of tasks. Proteins are found in more animal-based foods such as meat, vegetables, grains, and seeds.

Carbohydrates are more of the sugary molecules that provide short-term or immediate energy for the body. They can be found in foods like bread, beans, milk, popcorn, potatoes, cookies, spaghetti, and soft drinks.

The Bond Order would be 0.5.

Bond order is the number of bonding pairs of electrons between two atoms. In a covalent bond between two atoms, a single bond has a bond order of one, a double bond has a bond order of two, a triple bond has a bond order of three, and so on.

Bond Order= [tex]\frac{Bonding E- Antibonding E}{2}[/tex]

so ,

= [tex]\frac{8-7}{2}[/tex]

= 0.5

As Bond Order is 0.5 so molecule would be very reactive as bond is pretty weak.

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Explanation:

Actually the total abundant of isotopes of any element in the world must sum up to 100 percent. So we initially know that 12c is 98.9 percent. Therefore the remaining of the remains of 100 must be 12

3c = 100%- 98.9

13c= 1.1%

The molar concentrations of the two acids is Hcl = 0.4 M, NaOH = 0.3 M.

What is Molarity?

The ratio of the solute molecular weight to the length of the solution is known as molarity. By dividing the number of moles of HCl by the volume (L) of the solution in which it was dissolved, we may determine the molarity of the acid solution.

What is moles?

Chemists utilise a mole, a very significant unit of measurement. Similar to how having a dozen eggs indicates you have twelve eggs, having a mole of anything means you have 602,214,076,000,000,000,000,000 of that thing. When measuring extremely small objects like atoms, molecules, or other particles, chemists must use moles.

Let a be moles of Hcl

Let b be moles of H₂SO₄

and we are given total moles of acid to be 0.07

SO a+b= 0.07 ⇒ 1

acid to titration, if

NaOH reacts with Hcl = a moles of NaOH is required

If NaOH reacts with H₂SO₄ = 2b moles of NaOH are required

so and we are given

NaOH = 50 ml and 2 Hsol

no.of moles

nNaOH = 10/100 = 0.1 moles

so a+2b = 0.1 moles ⇒2

solving 1 and 2

b= 0.03 moles

b= 0.03

a= 0.04

molar acids of two concentrations are given

n Hcl = 0.04 moles

n NaOH = 0.03 moles

molar concentration of Hcl = 0.04* 100/100*100 = 0.4

Molarity of Hcl = 0.4 M

Molar concentration of NaOH = 0.03*100/100*100 = 0.3

Molarity of NaOH = 0.3 M

Therefore,  the molar concentrations of the two acids is Hcl = 0.4 M, NaOH = 0.3 M.

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Answer:

false, Rutherford's experiment proved the nucleus being positive and dense.

A balloon contains 0.76 mol n2, 0.18 mol o2, 0.031 mol he and 0.026 mol h2 at 749 mm hg is 140mmH.Each gas that makes up a mixture of gases has a partial pressure.

According to Dalton's Law, a perfect gas mixture's total pressure equals the sum of its constituent gases' individual partial pressures. The thermodynamic activity of a gas's molecules is gauged by its partial pressure. Gases react, disperse, and dissolve based on their partial pressures rather than the concentrations they have in liquids or other gas combinations. This characteristic of gases generally holds true for biological gas chemical processes.

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The equilibrium constant for the reaction at 25 °C is 1.3602 . The  reaction at body temperature (37.0 °C) if the concentration of A is 1.6 M and the concentration of B is 0.50 M is - 87.287 kJ / mole.

Equilibrium constant is defined as a number that illustrates the relationship between the quantities of reactants and products in an equilibrium chemical reaction at a specific temperature.

ΔG° = - 9.660 kJ / mole = 9.660 x 10 ³ J / mole

T = 25 + 273.15 = 298.15 K

ΔG° = - RT ln K

ln K = -ΔG° / RT

ln K = - ( - 9.660 x 10 ³ J / mole ) / 8.314 J / k . mole X 298.15 K

ln K = 3.8970

K = 1.3602

T = 37 + 298.15 = 310.15 K

ΔG = ΔG° + RT ln Q

Where Q = 0.55 / 1.6 = 0.34375

ΔG = -9.660 X 10³ + [ 8.314 x 310.15 x ln ( 0.34375 )]

ΔG = - 87287.34 J / mole

ΔG = - 87.287 kJ / mole

Thus, the equilibrium constant for the reaction at 25 °C is 1.3602 . The  reaction at body temperature (37.0 °C) if the concentration of A is 1.6 M and the concentration of B is 0.50 M is - 87.287 kJ / mole.

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Answer:

Explanation:

14. radiation

15. thermal conductivity

16. conduction

17. convection

There are some thermometers that use alcohol instead of the mercury that is typically used. Alcohol has a lower freezing point (-114°C) than water (0°C), which is why we use it instead of water.

On the glass capillary tube, alcohol's vivid colour makes it simple to see.

Alcohol thermometer contents are less harmful and will evaporate more quickly than mercury in glass thermometer contents. The most popular variant is made of ethanol since it is inexpensive and has only a minimal risk of spillage.

What is thermometer?

A thermometer is a device used to gauge temperature. It can gauge the temperature of a solid substance like food, a liquid substance like water, or a gas substance like air. Celsius, Fahrenheit, and kelvin are the three most widely used units for measuring temperature.

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The length of the side of the cell is  0.511nm when lead crystallizes with a face-centred cubic (fcc) unit cell.

What do you mean by crystallizes?

Having a distinct shape, a crystal is solid. When the symmetrically aligned smooth plane surfaces of crystals collide, sharp edges are created. After cooling a heated saturated solution, crystals can be formed. Crystallization is the name given to this procedure.

What is Face-centered cubic?

A face-centred cubic unit cell structure is made up of atoms arranged in a cube with six additional whole atoms placed in the centre of each cube face and a fraction of an atom at each of the cube's four corners. Eight additional unit cells share the atoms at the cube's corner.

What are the calculations?

For the fcc unit cell, a=2 √2 r.

Here, a is the edge length and r is the atomic radius (0.181 nm).

a=2 √2 × 0.181 =0.511 nm.

Hence, the length of a side of a cell is 0.511nm.

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The specific heat of the gas is 0.453 J/gº.

What is Specific Heat?

The following method can be used to calculate specific heat values: Heat always transfers from the warmer to the cooler material until both materials reach the same temperature when two materials, each at an initial different temperature, are placed in contact with one another. The heat obtained by the initially colder substance must equal the heat lost by the initially warmer material, according to the law of conservation of energy.

We are aware that when a substance absorbs heat energy, its temperature rises. It is noted that the temperature rise for each substance varies when the same amount of heat is applied to equal masses of various substances.

When we solve for q, we have... q = ∆E - w ∆E = +6905 J w = -346 J (negative value since work was done BY the system, and not on it) (negative value because work was done BY the system, and not on it) q = 6905 - (-346) = 7251 J.

This can now be used to q = mCT.

q = mC∆T

q = 7251 J

80 g of mass is m.

Does C equal specific heat?

T = temperature change equals 225° - 25° = 200°

C=q/(m)T=7251 J/(80.0 g)(200o)

C = 0.453 J/gº

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The conditions for alkene as a major product is attaching EWG with a aromatic compounds.

In the event that hydrogen is added to the tertiary carbon of an alkene, secondary carbocation is also a scenario that may arise; however, tertiary cation is more stable than secondary. Alkene is the end product following the release of H. A significant product is more substituted alkene.

We frequently overlook the ion concentration in water for the same reason that we frequently ignore the electron mass (we just add the protons and neutrons) due to their tiny size. The -log(conc) cannot be taken in this case.

The substituted alkane must have a low leaving group for E1cB to take place. The E1cB reaction is favored by strong EWG at the carbon and a weak leaving group. One of its beta carbons must also have a hydrogen on it. Fluorine, a poor leaving group, is present in reactant.

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ΔH(fusion) is not required to determine the amount of heat that must be added for this change to occur.

What is specific heat and enthalpy of phase transition?

The energy required in the form of heat to increase temperature by one-degree Celsius  and enthalpy of phase transition defined as heat change at constant pressure and temperature for per mole substance from one phase to another.

In between 50 to 100 °C water remains in same phase it gains heat so calculate it using specific heat of liquid.

b) At 100°C it absorbs heat and transfer into vapor phase and require ΔH(vaporization).

c) In between 100°C to 150°C in vapor phase specific heat of gas is required.

But no requirement of ΔH (fusion).

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