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Substance R changed phase because the weak attraction between molecules let them move faster.  Option C

We know that a change of phase has to do with the movement of a material from a given state of matter to the other. Net us note that when there is a change of state, we are going to notice that the force of attraction in the molecule would also change.

Since we know that the substance that we have are liquid at room temperature, we know that the supply of some energy may cause to be bale to change its phase.

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Explanation

Given:

Molar mass of ascorbic acid, M = 176 g/mol

Moles of ascorbic acid in sweet lime = 2.88 x 10⁴ mol

what to find:

The mass of ascorbic acid in 2.88 x 10⁴ mol of ascorbic acid.

Step-by-step solution:

The relationship between mole, n, reacting mass, m, and molar mass, M, is given by

So, substitute the given moles and molar mass of ascorbic acid into the formula above to get the mass of ascorbic acid:

Answer:

Explanation:

The pH of 0.02 M hydrochloric acid is approximately 1.7.

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The mass of a single bromine molecule, Br₂ is 2.654 x 10⁻²² g.

Bromine is a diatomic element. It has a symbol Br and the atomic number is 35. Bromine is a naturally occurring element which is liquid at room temperature.

Molar mass of Br₂ is 159.808 g/mol. The molar mass of bromine is 79.904 g/mol. In Br₂, there are two bromine atoms.

To calculate the mass of a single bromine molecule -

In 1 mole of Br₂, there is Avogadro's number of molecules.

Avogadro's number = 6.022 x 10²³

Therefore, 1 mole = 6.022 x 10²³

1 mole of bromine has mass of 79.9 g/mol

So, it gives us -

1/6.022 x 10²³ = 1.66 x 10²³/79.9 = 2.654 x 10⁻²²g

For the mass of a single bromine molecule, Br₂ = 2.654 x 10⁻²² g

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Answer:

A chemical change

Explanation:

A chemical change is a change that produces matter with a different composition than the original matter

Despite the long text, this is another stoichiometry question, I will follow the same step by step I have explained in our previous session

1. Balancing the equation:

Cu + 2 AgNO3 -> Cu(NO3)2 + 2 Ag, now the reaction is properly balanced

2. If we had 2.36 grams of Cu and only 1.03 grams are left, this means that we had copper in excess, and only 1.33 grams actually reacted, using the molar mass of Cu, 63.55 g/mol, we can find the number of moles:

63.55g = 1 mol

1.33g = x moles

x = 0.02 moles of Cu

3. Finding the molar ratio, which we can find by looking at the reaction, between Cu and Ag, the molar ratio is 1:2, which means 1 mol of Copper to produce 2 moles of silver, therefore if we have 0.02 moles of Cu, we will end up with 2 times this value, which is 0.04 moles of Ag

4. Now we have the number of moles of Ag, and its molar mass is, 107.87g/mol

107.87g = 1 mol

x grams = 0.04 moles

x = 4.31 grams of Silver will be produced from 1.33 grams of Copper

If data from a clinical trial contains personal information about a study participant, De-identification process should be used to separate identifying information from health information. Thus, Option (A) is correct

De-identification is a process of detecting identifiers (e.g., personal names and social security numbers) that directly or indirectly point to a person (or entity) and deleting those identifiers from the data.

De-identification and anonymization are strategies that are used to remove patient identifiers in electronic health record (EHR) data.

Hence, De-identification process should be used to separate identifying information from health information. Thus, Option (A) is correct.

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The society with the least negative effects on the environment is probably the one with a small population, traditional farming methods, no access to contemporary technology, and self-sufficient food production.

This is due to the fact that their way of living is less dependent on modern infrastructure and technology, both of which have a negative impact on the environment. Additionally, their agricultural methods are probably more environmentally friendly and sustainable.

The environmental effects of the other societies on the list would all be greater. Because of the use of fossil fuels and the production of products that require a lot of resources, a big, industrialized society with high levels of consumption would have a significant carbon footprint.

It would still take a lot of resources to maintain its infrastructure and create products in a less populous, highly industrialized society with moderate consumption levels, which would have a negative effect on the environment.

Given that the size of the population alone would necessitate significant resource consumption and infrastructure development, a big population with moderate industrialization and consumption levels would also have a big effect on the environment.

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Answer:

Solid turns to liquid.

Explanation:

When you freeze water, it turns into ice. When melted it's still water. No chemical changes were made to the piece of ice melted. The only change was ice (solid) to water (liquid)

Conservation of Matter - Matter can change forms through physical and chemical changes, but no matter what, matter is conserved. The same amount of matter exists before and after the change.

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In the electrical arrangement, the 6p subshell of the radon element contains 6 electrons.

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Answer:

The southern hemisphere is currently experiencing "Summer"

Explanation:

The Southern hemisphere is experiencing summer because it is closer to the sun than the Northern Hemisphere and also, direct light is more hotter than indirect light.

So, first, let's try an EXPERIMENT!

Take a VERY bright flashlight or a very small laser that can't harm you or just burn a paper in 1 second.

Then, take a piece of paper, or maybe just your skin, (like your hand) and place it under the light or laser, (for the laser, you should probably take the paper), and place the light source right above your skin, then, after some time, when it gets hot, measure the temperature. (around like 30 seconds later),

Note down the temperature...

Now, do the same thing, accept, do it in a very weird angle, face it towards your paper or hand, but, do it in an angle. More than like 30 degrees. Then, after some time, note down the temperature.

You probably, noticed, that the direct light (the one with the straight light facing your paper or skin, was hotter). Look at the image below, and you can understand better.

So, the same thing applies to the earth. The southern hemisphere in this picture is facing more directly to the sun than the northern hemisphere. That is why your answer is

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Remember to have fun, and a nice day!

Answer:   summer

Explanation:

Initially, we will consider only solutions of a solid in ... (d) Calculate the volume (in mL) of 0.1065 M Sr(OH)2 required to titrate 25.00 mL of 0.2465 M.

:

Explanation:

The minimum mass of hydrochloric acid that could be left over by the chemical reaction is 18.23 g.

Moles in chemistry is a unit of measurement for the amount of a substance. It is equal to the number of atoms or molecules in a given mass of a substance, and is represented by the symbol ‘mol’. The molar mass of a substance is the mass of one mole of that substance, expressed in grams. It is important for calculating the amount of energy or reactants needed for a reaction. Moles can also be used to measure the concentration of a solution.

The minimum mass of hydrochloric acid that could be left over by this chemical reaction can be calculated using the following equation:

Moles of HCl = Mass HCl / Molar Mass HCl

Moles of NaOH = Mass NaOH / Molar Mass NaOH

Moles of HCl must equal moles of NaOH in the reaction, so:

Moles HCl = Moles NaOH

Mass HCl / Molar Mass HCl = Mass NaOH / Molar Mass NaOH

Rearranging for mass HCl:

Mass HCl = Molar Mass HCl x Mass NaOH / Molar Mass NaOH

Given:

Mass HCl = 28.8 g
Molar Mass HCl = 36.46 g/mol
Mass NaOH = 20.0 g
Molar Mass NaOH = 40.0 g/mol

Substituting values:

Mass HCl = 36.46 g/mol x 20.0 g / 40.0 g/mol

Mass HCl = 18.23 g

Therefore, the minimum mass of hydrochloric acid that could be left over by the chemical reaction is 18.23 g.

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1mol H_2O requires 44kJ heat

Moles of water

Heat required

As per the reaction given

Moles of H_2O=1

Moles of water in 9g

∆H

Answer:

D: Decomposition Reaction

Explanation:

A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances.

The general form of a decomposition reaction is: AB -> A+B.

You just split the nonmetals into a molecule depending on the element.

But they are rules though when doing this reaction. If a element is a diatomic molecule, then you would write a 2 in the subscript.

Diatomic molecules contain two atoms that are chemically bonded

Now let us go back to this problem: 2H2O -> 2H2 + O2

So water or 2H2O split into 2H2 and O2 because hydrogen and oxygen are diatomic elements.

That is how you write the product of a decomposition reaction.

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The United States experienced a decrease in the real GDP, high inflation, and arising unemployment rate.

The United States appeared to be entering a recession.A recession is a decline in economic activity, characterized by declining GDP, high unemployment rates, and increased unemployment benefits. Economic analysts and the media commonly use a two-quarter consecutive decline in real GDP as a definition of a recession.

The United States is considered to have entered a recession in the 1970s, which was characterized by an energy crisis, inflation, and recession. However, by the end of the decade, the economy had improved, and it entered into the 1980s with a strong economic performance.

The 1970s were a period of high inflation, low growth, and an oil crisis, which had a significant impact on the United States economy. Therefore, it can be concluded that The United States was in the middle of an economic boom before the 1970s recession and entered a recession in the 1970s due to a decrease in the real GDP, high inflation, and arising unemployment rate.

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0.294kg is mass (in kg) that 4.64 moles of Copper have.

The unit of material quantity in the International System of Units is the mole (SI). A substance's quantity determines how many elementary entities of that substance are contained in an object or sample. The number of elementary entities in a mole is precisely 6.02214076 × 10²³.

The amount of a substance in a mole is determined by the mass of a mole of that substance divided by the mass of the substance given in a chemical reaction. The term is also used to express concentration measurements like mole per litre and molecular weight.

m= n × MM

m is mass in grams; n is moles & MM is molecular mass

The molecular mass of copper is 63.546.

We now have all the required information to perform the calculation

m= 4.64 × 63.546

m= 294 g

= 0.294kg

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No, 48 ounces are not enough. For making a small robot we need 64 ounces which is equal to 4 pounds.

Pound is a unit for measuring weight. 16 ounces makes one pound.

Ounce is also a unit for measuring weight. 16 ounces is equal to 1 pound

So, for making one small robot we need 4 pounds.

1 pound = 16 ounces

4 pounds = 64 ounces

But, we have 48 ounces

We need more = 64 - 48 = 16 ounces or 1 pound

No, 48 ounces are not enough. For making a small robot we need 64 ounces which is equal to 4 pounds.

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Answer:

No

Explanation:

thats scientifically impossible

Answer:

D  The dinosaur could have died due to an meteor crash.

Explanation:

Answer:

D

Explanation:

The dinosaurs fossils were found ten miles away from the meteor crash site. Correct me if I'm wrong

The correct answers to the problem given above about germanium IV oxide are as follows:

GeO₂ is a chemical compound also known as germanium oxide, germanium dioxide or germanium IV oxide. It is a polar covalent which is a soluble substance to some extent.

In conclusion, it can be deduced from the explanation given above that germanium IV oxide is a chemical compound.

The complete lewis structure of germanium IV oxide is attached.

Complete question:

Answer the following questions about germanium IV oxide, GeO₂

a. Determine its lewis structure.

b. Its bonding pairs/lone pairs

c. What is its electron geometry (GeO₂)?

d. Its shape (GeO₂)?

e. Is germanium IV oxide a polar or non-polar molecule?

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There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).

The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.

Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.

Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.

In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.

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The mass percent of the sodium chloride in the saline solution is approximately 1.33%. The molar concentration of the saline solution is approximately 0.229 M.

To determine the mass percent and molar concentration of the saline solution, we need to analyze the mass of the sodium chloride residue and the initial mass of the sample.

Mass percent:

The mass percent is calculated by dividing the mass of the sodium chloride residue by the initial mass of the sample and then multiplying by 100%.

Mass percent = (Mass of NaCl / Initial mass of sample) × 100%

Mass of NaCl = 0.669 g

Initial mass of sample = 50.320 g

Mass percent = (0.669 g / 50.320 g) × 100% ≈ 1.33%

The mass percent of the sodium chloride in the saline solution is approximately 1.33%.

Molar concentration:

To calculate the molar concentration of the saline solution, we need to determine the number of moles of sodium chloride and the volume of the solution.

Moles of NaCl = Mass of NaCl / Molar mass of NaCl

The molar mass of NaCl is 58.44 g/mol.

Moles of NaCl = 0.669 g / 58.44 g/mol ≈ 0.01144 mol

Since the volume of the sample is given as 50.0 mL, we need to convert it to liters.

Volume of solution = 50.0 mL = 50.0 mL × (1 L / 1000 mL) = 0.0500 L

Now we can calculate the molar concentration (Molarity) using the formula:

Molarity (M) = Moles of solute / Volume of solution (in liters)

Molarity = 0.01144 mol / 0.0500 L ≈ 0.229 M

The molar concentration of the saline solution is approximately 0.229 M.

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The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the pH of buffer is 10.5. pH is a unitless quantity.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.

CH\(_3\)NH\(_2\) + H\(_2\)O(aq) \(\rightarrow\) CH\(_3\)NH\(_3\) ⁺(aq) + OH⁻(aq)

Kb = [CH\(_3\)NH\(_3\) ⁺] x[OH⁻] =3.7x 10⁻⁴

[CH\(_3\)NH\(_2\)]= 0.2 / 1.00 =0.2M

Kb = (0.2M) x [OH⁻] = 3.7x 10⁻⁴

[OH-] = 3.15 x 10⁻⁴

pOH=-log[OH-]

      = -log[3.15 x 10⁻⁴]

pOH=3.5

pH+pOH=14

pH = 10.5

Therefore, the pH of buffer is 10.5.

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When each molecule of Na₂SO4•10H₂O is heated, it loses 10 water molecules.

When Na₂SO₄•10H₂O is heated, it loses water molecules to become anhydrous Na₂SO₄.

The number of water molecules lost can be calculated as follows:

Each molecule of Na₂SO₄•10H₂O contains 10 water molecules, so when it is heated, it loses all of these water molecules.

Therefore, when each molecule of Na₂SO4•10H₂O is heated, it loses 10 water molecules.

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Answer:

1) (5 moles of calcium bromide) x 2 / 1 = 10 moles

2) (2.00 moles of calcium bromide) = 2.00 moles of calcium sulfate

so (2.00) x (136.1 g/mol) = 272.2 g

3) (845 grams of calcium sulfate) /  136.14 g/mol = 6.21 moles

6.21 moles of calcium sulfate = 6.21 moles of calcium bromide

(6.21 moles of calcium bromide) x 199.89 g/mol = 1241.32 g

Answer:

high tides are a little higher and low tides are a little lower than average

Explanation:

A spring tide is the highest tide (when the greatest difference between the high and low tides). This happens during the new and full moon.

Answer: It's worth noting that low tides can sometimes be lower than usual, which is referred to as spring tides. Despite its name, this phenomenon isn't related to spring and has a different historical origin.

Answer: the pressure releases gas. The two most abundant gases are sulfur dioxide and carbon dioxide, and if levels of these gases increase,

Explanation: