2. Transfer in energy to reach the highest amount of kinetic energy for both substance B and C.

3. Slowly transfer out energy from each substance. Note the temperature at which each substance changes phase.

​Substance B changed to a liquid at
? °C.
Substance C changed to a liquid at
? °C.


4. Based on your observations above, which substance needed a greater decrease in kinetic energy in order to change phase?
The substance with (medium or low energy)

Answer:

When salt is mixed with water, the salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules.

Explanation:

its like cotton candy in water

AWater can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions. The amount of a substance that can dissolve in a liquid (at a particular temperature) is called the solubility of the substance

Explanation:

Answer:

To find the molar mass of BeCo3, we need to find the atomic masses of each element and add them together in the correct ratio:

Be: 9.01 g/mol

Co: 58.93 g/mol

O: 16.00 g/mol (there are three oxygen atoms)

Molar mass of BeCo3 = (1 x Be atomic mass) + (1 x Co atomic mass) + (3 x O atomic mass)

Molar mass of BeCo3 = (1 x 9.01 g/mol) + (1 x 58.93 g/mol) + (3 x 16.00 g/mol)

Molar mass of BeCo3 = 9.01 g/mol + 58.93 g/mol + 48.00 g/mol

Molar mass of BeCo3 = 115.94 g/mol

Therefore, the molar mass of BeCo3 is 115.94 g/mol.

Fluorine is most likely the diatomic element with the mass of 19.08 grammes held in a container at 100°C (F2).

Diatomic molecules are those that contain two atoms. Iodine (I2), fluorine (F2), chlorine (Cl2), bromine (Br2), nitrogen (N2), oxygen (O2), and hydrogen (H2) are all diatomic elements. Diatomic molecules make up the bromine atom, Br2, in the periodic table.

The diatomic molecules of the group 7 elements are present. They have the chemical formulas F2, Cl2, Br2, and I2. Although the forces of attraction between molecules are minimal, the connection between the atoms in a molecule is quite strong. This explains why the boiling points of group 7 elements are low.

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Question:

Which of the following diatomic elements would have a mass of 19.08 grams stored in a container at and 100°C? (R= 0.0821 L atm/ mol K).

Thediatomic element with a mass of 19.08 grams stored in a container at 100°C is hydrogen (H2), which has a pressure of 27.2 atm.

What is Diatomic Elements?

Diatomic elements are chemical elements that exist as two atoms bound together in a molecule. Examples of diatomic elements include oxygen (O2), nitrogen (N2), hydrogen (H2), fluorine (F2), chlorine (Cl2), and iodine (I2).

To determine the diatomic element with a mass of 19.08 grams stored in a container at 100°C, we need to use the ideal gas law, which is given by:

PV = nRT

where P is the pressure of the gas, V is its volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin.

We can rearrange this equation to solve for the number of moles:

n = PV/RT

We are given the mass of the gas, which we can convert to moles using the molar mass of the element. The molar mass of a diatomic element is simply twice the atomic mass of the element. Using the periodic table, we find the following atomic masses:

H: 1.008

N: 14.007

O: 15.999

F: 18.998

We can calculate the molar mass of each diatomic element:

H2: 2 x 1.008 = 2.016 g/mol

N2: 2 x 14.007 = 28.014 g/mol

O2: 2 x 15.999 = 31.998 g/mol

F2: 2 x 18.998 = 37.996 g/mol

Now we can calculate the number of moles of the gas using the given mass and molar mass:

n = 19.08 g / molar mass

Using the molar masses above, we get:

For H2: n = 19.08 g / 2.016 g/mol = 9.47 mol

For N2: n = 19.08 g / 28.014 g/mol = 0.68 mol

For O2: n = 19.08 g / 31.998 g/mol = 0.60 mol

For F2: n = 19.08 g / 37.996 g/mol = 0.50 mol

Finally, we can use the ideal gas law to calculate the pressure of the gas, assuming a volume of 1 liter:

P = nRT/V = (number of moles) x R x (temperature in Kelvin) / V

Plugging in the values, we get:

For H2: P = 9.47 mol x 0.0821 L atm/mol K x (100+273.15) K / 1 L = 27.2 atm

For N2: P = 0.68 mol x 0.0821 L atm/mol K x (100+273.15) K / 1 L = 1.97 atm

For O2: P = 0.60 mol x 0.0821 L atm/mol K x (100+273.15) K / 1 L = 1.74 atm

For F2: P = 0.50 mol x 0.0821 L atm/mol K x (100+273.15) K / 1 L = 1.45 atm

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If 25.82 mL of 0.0500 M NaOH solution are required to reach the equivalence point of an acid-base titration of 40.0 mL of 7-Up, the number of NaOH required is 0.00126 moles.

The point at which chemically identical amounts of reactants are put together is known as the equivalence point in a chemical reaction.

In other words, during titration, it is the point at which the titrant addition is sufficient to totally neutralize the analyte solution. The number of moles of a solution with an unknown concentration is equal to the number of moles of a titrant, or standard solution. Because it is a point where the amount of acid and base required to neutralize a solution is equal, it is often referred to as the stoichiometric point. It should be noted that the acid to base ratio need not be 1:1. The balanced acid-base chemical equation explains this acid-base ratio. For this, indicators might be used, for example, phenolphthalein or methyl orange.

The reaction between citric acid and NaOH is,

H₃C₆H₅O₇(aq) + 3NaOH(aq) →   Na₃C₆H₅O₇(aq) + 3H₂O(l)

According to the formula,

M = [tex]\frac{n}{V}[/tex]

where,

M is the molarity,

n is the number of moles and,

V is the volume(L)

For NaOH;

M = 0.0500 M

V = 25.82ml = 0.02582 l

n = M × V

n = 0.00126 moles

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345.53 g of glucose can be produced from the given reaction, using 11.5 mol of CO2.

What is Photosynthesis Reaction?

Photosynthesis is a process by which plants, algae, and some bacteria convert carbon dioxide (CO2) and water (H2O) into organic compounds, such as glucose, using sunlight as the source of energy.

6 CO2 + 6 H2O + energy (sunlight) → C6H12O6 (glucose) + 6 O2

From the balanced equation, we know that 6 moles of carbon dioxide react to form 1 mole of glucose. Therefore, we can calculate the moles of glucose produced from 11.5 moles of CO2:

moles of glucose = 11.5 mol CO2 / 6 mol CO2 per mole of glucose = 1.9167 mol glucose

Next, we can use the molar mass of glucose to calculate the mass of glucose produced:

mass of glucose = moles of glucose x molar mass of glucose

mass of glucose = 1.9167 mol x 180.156 g/mol

mass of glucose = 345.53 g

Therefore, 345.53 g of glucose can be produced from the given reaction, using 11.5 mol of CO2.

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Answer:

36 tabs

Explanation:

Bid is 2 times per day

2 tablets tid is 6 tablets a day

In 3 days, that is 18 tablets

2 tabs bid for 3days is 4x3 =12 tablets

1 tab daily for 3 days = 3 tablets

1 tab every other day, 3 doses is 3 tab

Add all. 18+12+3+3

The density of the solid cylinder is calculated to be as  approximately 17.7 g/cm³.

The mass per unit of volume of a substance is known as density and symbol that is mostly used for density is ρ.

As the formula for the density of an object is:

density = mass / volume

volume = π x radius² x height

volume = π x (3cm)² x 10cm

volume = 282.74 cm³

mass = 5kg x 1000g/kg = 5000g

density = mass / volume

density = 5000g / 282.74 cm³

density ≈ 17.7 g/cm³

Therefore, the density of the solid cylinder is approximately 17.7 g/cm³.

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Answer:

Let x = amount invested in certificate of deposit (in dollars)

Let y = amount invested in corporate bonds (in dollars)

Total amount invested = $100: x + y = 100

CD pays 2% per year, corporate bonds pay 4% per year, total return is 3% per year

Total return on investments = 3% of $100 = $3: 0.02x + 0.04y = 3

Simplifying the equations:

x + y = 100

2x + 4y = 300

Solving for x:

x + y = 100

x = 50

Therefore, the person should invest $50 in the certificate of deposit and $50 in corporate bonds to obtain an overall return of 3% per year.

Explanation:

13.8 g of magnesium chloride is equal to 8.73 x 10 22 formula units ( MgCl2 ). chlorhydrate of magnesium. a two-chloride ion and one magnesium-based inorganic molecule.

This drug is a mineral supplement used to prevent and cure low levels of magnesium in the blood. Certain brands are also used to treat symptoms of too much stomach acid, including indigestion, heartburn, and stomach discomfort.

Chloride of magnesium

It serves as a crucial coagulant in the production of tofu, soy, drinks, and infant formula milk. Magnesium chloride is also employed in the brewing of beer as a taste ingredient and in food coloring.

MgCl2 mass = 13.8 g

Molar mass of MgCl2 = 95.2 g/mol

Number of moles of MgCl2 = ( mass of MgCl2 / Molar mass of MgCl2)

           = ( 13.8g ) / ( 95.2g/mol) = 0.14496 mol

Number of MgCl2 moleucles ( or number of formula units) = Moles of MgCl2 x avagadro number

                       = 0.14496 mol x 6.022 x 10^ 23

                   = 8.73 x 10^ 22

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There are 0.802 moles of gold present in 158 grams of gold.

Mass in grams of one mole of the compound is known as the molar mass of substance. It is the mass divided by amount-of-substance measured in moles. Molar mass of a compound can be found out by adding standard atomic masses of constituent atoms.

molar mass of gold : 196.967 g/mol.

To find the number of moles of gold in 158 grams, we use the following formula:

moles = mass / molar mass

moles = 158 g / 196.967 g/mol

moles = 0.802 mol

Therefore, there are 0.802 moles of gold in 158 grams of gold.

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Note: The question given on the Portal is incomplete. Here is the correct question.

Question: How many moles are in 158 grams of gold?

The limiting reactant is completely used up in the reaction. There will be an excess of other reactants at the end of the reaction. The limiting reactant dictates the amount of product.

Reactant will be the limiting reactant depends on the molar ratios of all the reactants in the experiment (and the coefficients in the balanced reaction equation), so it will absolutely vary depending on the reaction setup and conditions, which is why it cannot always be the same for a given reaction.

Because the molar ratios of the reactants dictate which of them will be the limiting one, it is not true that the one with the lowest mass will always be the limiting reactant.

Therefore, The limiting reactant is completely used up in the reaction. There will be an excess of other reactants at the end of the reaction.

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Answer: Oxygen and glucose are both reactants in the process of cellular respiration. The main product of cellular respiration

White-tailed deer have eyes on the sides of their heads. This provides them with a broad range of view for identifying predators.

Adaptation has three meanings in biology. For starters, natural selection is a dynamic evolutionary process that adapts organisms towards their environment, increasing their evolutionary fitness.

Second, it is a condition attained by the population as a result of that process. The fawns depend on their behavioral and physical adaptations to survive their first few weeks. White-tailed deer are quick and nimble. White-tailed deer have eyes on the sides of their heads. This provides them with a broad range of view for identifying predators.

Therefore, white-tailed deer have eyes on the sides of their heads. This provides them with a broad range of view for identifying predators.

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Mendel's first generation pea plants with purple flowers would have had two alleles for flower color.

Alleles are different versions or variants of a gene that occupy the same position, or locus, on a chromosome. Each individual inherits two alleles for each gene, one from each parent, which can be either the same (homozygous) or different (heterozygous). These alleles can have different effects on the organism's phenotype (observable trait) and can be dominant or recessive, with dominant alleles masking the expression of recessive ones. For example, in humans, the gene for eye color has different alleles that produce different colors such as brown, blue, or green. The specific combination of alleles that an individual inherits determines their genotype, which in turn influences their phenotype. The study of alleles and their inheritance patterns is a fundamental concept in genetics and has important applications in fields such as medicine, agriculture, and evolutionary biology.

Here,

However, the specific alleles cannot be determined from this information alone. According to Mendel's laws of inheritance, each individual inherits two alleles for each trait, one from each parent. These alleles can be either the same (homozygous) or different (heterozygous). If the two alleles are different, one may be dominant and determine the organism's phenotype (observable trait), while the other may be recessive and not expressed in the phenotype. In the case of Mendel's purple-flowered pea plants, the specific alleles responsible for the purple flower color would have been determined through further experimentation and analysis.

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Answer: dont get it

Explanation:

Distance 11.143 ft or thereabouts is Distance roughly how far the tree extends from its tip to its base.

Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting and ending position.

We obtain a quadratic equation by simplifying and expanding the left side:

2y^2 - 288y + 144 = 0

The quadratic formula is used to solve for y, and the result is: y = [288 (2882 - 4(2)(144)]

/(2(2))

y = [288 ± √58368]

y = 0.857 ft or /4 y = 84 foot

The only viable answer is: y 0.857 ft since y cannot be higher than 12 ft (the whole height of the tree).

The result of changing this number for y in the equation x + y = 12 ft is: x + 0.857 ft = 12 ft x 11.143 ft

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Answer:

c) MALDI coupled with time of flight (TOF) MS would be the best technique to analyze a polymer that is not very soluble in most solvents with mass spectroscopy and get an estimate of its molecular weight. This technique is particularly suited for the analysis of large molecules such as polymers and biopolymers. MALDI (matrix-assisted laser desorption/ionization) is a soft ionization technique that uses a laser to desorb and ionize molecules from a solid matrix. The resulting ions are then accelerated in a time-of-flight (TOF) mass analyzer, which separates them according to their mass-to-charge ratio (m/z). The mass spectrum obtained from this technique provides information on the molecular weight of the polymer.

Explanation:

The words that complete the blanks are;

1) Less

2) More

3) Group 17

4) Group 1

Electronegativity is a measure of an atom's ability to attract electrons towards itself when it forms a chemical bond with another atom. It is a relative property, meaning that it is determined by comparing the electronegativities of two or more elements.

Electronegativity values are typically determined on a scale of 0 to 4, with 4 being the highest electronegativity value. Fluorine, the most electronegative element, has an electronegativity value of 4.0, while other elements have values that are lower than 4.0.

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You use q = mcT again, but this time you assume qaluminum = qwater and solve for T, which is the ultimate temperature. You must research the specific heat values (c) of aluminum and water.

To calculate the heat capacity of a metal, use Q = smT. (In this calculation, make careful to include the heat given out by the metal, the mass of the metal, and the temperature change of the metal.)

The metal will cool and the water will heat up over time. The two things will eventually have the same temperature. They are then considered to be thermally balanced with one another.

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The mouthwash is included in 159 bottles, each of which contains about 7.05 kilos of ethanol.

Phenol, 5-methyl-2-(1-methylethyl)-, mixed with 1,3,3-trimethyl-2-oxabicyclo(2.2.2)octane and 5-methyl-2-(1-methylethyl)cyclohexanol. 460.7 molecular weight.

First, we must convert each bottle's mouthwash's pint-to-liter volume:

0.280 pt x 0.4732 L/pt = 0.1324 L

Using the density of the mouthwash in each bottle, we can determine its mass:

0.1324 L x 0.868 g/mL = 0.1149 kg

We can determine the mass of ethanol in each bottle because the mouthwash contains 38.7% ethanol by mass:

0.1149 kg x 0.387 = 0.0444 kg

the total mass of ethanol in 159 bottles of mouthwash:

0.0444 kg/bottle x 159 bottles

= 7.05 kg

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Answer:

1.yes

2.invasive species are_ accidentally transported to a new ecosystem

3.false

4.increase

5.

6.fencing

sorry I don't know the fifth one but I hope it helpful

Answer:

+2.

Explanation:

Each phosphate ion (PO43-) has a charge of -3. Since there are two phosphate ions in the formula, the total negative charge from the phosphate ions is -6.

In order to balance the negative charge, the sum of the positive charges from the X3+ ions must be +6.

the charge of element X can be calculated as follows:

X3+ × 3 = +6

X3+ = +2

So the charge of element X in X3(PO4)2 is +2.

The metal would be the cathode and Zinc would be the anode. There must be an anode and a cathode in an electrochemical cell.

Steps to electroplate a metal with zinc:

Prepare the electrolyte solution: Dissolve zinc sulfate in water to make a solution. This will serve as the electrolyte solution.

Prepare the metal to be plated (cathode): Clean the metal to be plated thoroughly to remove any dirt, grease, or other contaminants. This is important to ensure good adhesion of the zinc plating.

Prepare the zinc anode: Clean the zinc anode thoroughly and suspend it in the electrolyte solution.

Set up the electroplating apparatus: Connect the positive terminal of the power supply to the zinc anode and the negative terminal to the metal to be plated (cathode). Place the metal to be plated (cathode) in the electrolyte solution.

Start the electroplating process: Apply a direct current (DC) voltage to the electrodes. This will cause the zinc ions in the electrolyte solution to be attracted to the metal to be plated (cathode) and deposit on its surface.

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It should be noted that the right response is (b) Alcoholic KOH, which upon hydrolysis would produce the secondary alcohol propan-2-ol.

The reagent X should be able to add a nucleophile to the carbonyl carbon of CH3CHO, and the product formed should be capable of being hydrolyzed to give propan-2-ol.

Option (c) CH3MgI (Grignard reagent) is a strong nucleophile and can add to the carbonyl carbon of CH3CHO to form a tertiary alcohol. However, the product formed will be propan-2-ol (2-methylpropan-1-ol) instead of propan-2-ol (propanol). Therefore, option (c) can be eliminated.

Option (d) Alcoholic KCN is a nucleophilic reagent that can add to the carbonyl carbon of CH3CHO to form an intermediate that can be hydrolyzed to give a carboxylic acid. Therefore, option (d) can be eliminated.

However, since the reaction conditions are not specified, it is not possible to determine which of the two options is the correct answer. If the reaction is carried out under basic conditions, then option (a) would be the correct answer. If the reaction is carried out under acidic conditions, then option (b) would be the correct answer.

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When something gets cold, it absorbs energy in the form of cold energy from its environment. This energy is released as heat when the object is heated up again.

Energy is the ability to do work. It is the capacity to cause change, move objects, and make things happen. Energy can come from different sources, such as the sun, fossil fuels, and nuclear power. Energy can also be stored, such as in batteries, food, or chemical compounds. It is a fundamental part of the universe, and it is necessary for life to exist. Energy can take many forms, such as kinetic, potential, thermal, chemical, electromagnetic, and nuclear energy. Kinetic energy is energy that is in motion, such as a moving car or a flying bird. Potential energy is energy stored in an object due to its position or composition, such as a rock at the top of a hill. Thermal energy is the energy of heat, such as the heat from a fire.

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Answer:

Conclusion:

The purpose of this lab was to observe how light rays interact as they pass from one material to another. The hypothesis stated that if light rays are projected through a material, they will refract the most. The data collected in this lab supports the hypothesis. When light rays were projected through air onto the different materials, they either refracted or reflected. The angle of refraction was measured for each material and it was found that the angle decreased as the index of refraction increased.

Water refracted the light rays the most while air refracted the least. The density of a material affects refraction because it changes the speed at which light travels through the material. A more dense material causes light to travel slower and bend more, leading to greater refraction. If light was projected through a diamond, it would refract significantly due to the high density of diamond.

Reflection, refraction, and absorption of light can be observed in many everyday activities. Reflection can be seen in mirrors, windows, and other reflective surfaces. Refraction can be observed when light passes through a lens or prism, causing the light to bend and create a spectrum of colors. Absorption can be seen when certain colors of light are absorbed by objects, making them appear a different color.

The balanced chemical equation for KClO3 decomposition is: 2KClO3(s) → 2KCl(s) + 3O2(g). 0.061 moles of KClO3 reacted. Rounded to 3 significant figures, the answer is 0.0610 moles of KClO3.

How many moles of KClO3 reacted?

The balanced chemical equation for KClO3 decomposition is:

2KClO3(s) → 2KCl(s) + 3O2(g)

According to the equation, for every 3 moles of O2 produced, 2 moles of KClO3 react. Therefore, the number of moles of KClO3 can be calculated as:

moles of KClO3 = (2/3) × moles of O2

To find the moles of O2 produced, we need to use the molar mass of O2, which is 32 g/mol. As a result, the number of moles of O2 is:

moles of O2 = mass of(O2) / molar mass(O2)

moles of O2 = 2.94 g / 32 g/mol

moles of O2 = 0.092 mol

Now we can calculate the moles of KClO3:

moles of KClO3 = (2/3) × moles of O2

moles of KClO3 = (2/3) × 0.092 mol

moles of KClO3 = 0.061 mol

Therefore, 0.061 moles of KClO3 reacted. Rounded to 3 significant figures, the answer is 0.0610 moles of KClO3.

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Answer:

B

Explanation:

this equation shows an alpha decay

Answer:

Explanation:

% yield = (actual yield / theoretical yield) x 100%

actual yield = 21.47 g

theoretical yield = 65.45 g

% yield = (21.47 g / 65.45 g) x 100%

% yield = 32.80%

Therefore, the student obtained a percent yield of 32.80%.