A molecule or ion that donates the hydrogen in a hydrogen bond is a hydrogen bond donor

a. True
b. False

Hello. You forgot to say that this question is about the possibility of using some type of product that prevents cut apples from becoming darker.

Answer and Explanation:

1. The problem with this activity is "What can you put on an apple slice to keep it from turning brown?" The problem in a scientific experiment is the element that provides a question about what is being observed.

2. Hypotheses are assumptions made about what was observed, in addition, hypotheses can answer the question shown in the problem. In the case of apples, the hypotheses can be: "Lemon juice is the most efficient product in delaying the blackening of cut apples." "Water is inefficient in preventing blackened cut apples." "Milk accelerates the blackness of cut apples."

3. The dependent viable is one that needs to be influenced by another element to bring about a result. In the case of the experiment with apples, the dependent variable is the blackening rate of the apple slices.

4. The independent variable, on the other hand, refers to the element that does not need any influence to cause a result, on the contrary, this variable acts on the dependent variable, influencing it. In the case of this experiment, the independent variable is the types of liquid tested to delay the blackening of cut apples.

5. Lemon was the most efficient liquid. Probably this efficiency is related to the lemon's ability to decrease the strength of antioxidants, due to its very low pH.

Answer:

11 yes

12 H2O( water molecules)

13 3H2O( water molecules)

Explanation:

Sry, my phone's a potato, so I didn't read it properly, so I'm not sure about the question 11.

11-yes, they stay together, but they release 3 molecules of OH an H.

12- here it talks about what will happen with OH and H: they will be H2O (water molecules).

13- and here we end it with the informations that we got: 3 fatty acids+ glycerol---> fat+ 3H2O( the 3 H and 3 OH)

Answer:

No, Fe^3+will not interfere

Explanation:

Whether of not the two ions will interfere will depend on the region of the visible spectrum where they absorb.

Now Fe^3+  at a wavelength of 600nm for the determination of Cu^2+ ion will not interfere.  This is because,  Fe^3+ absorbs in the blue (450-480 nm) region while Cu+2 absorbs in the yellow (560-600 nm) region then appears blue in color.

Explanation:

this explanation may help u to understand:)

Explanation:

The elements Fluorine (F),Chlorine (Cl) and Iodine (I) are all part of the same Group ( i.e, Group 17 ) on the periodic table.

Answer:

Group

Explanation:

Answer:

1.67

Explanation:

Mass÷mr=moles

3÷18=1.67

The correct options are: changes in shape or size, color changes, formation of precipitates or gases, and whether changes are easily reversible.

According to the lab guide, the following changes below will be looked for in order to test the hypothesis: changes in shape or sizecolor changesformation of precipitates or gaseswhether changes are easily reversibleThese changes are the characteristics that will be observed in order to test the hypothesis in the lab. Furthermore, temperature changes and changes of state (gas, liquid, or solid) may also occur and can be observed while testing the hypothesis.

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Answer:

A,B,E,F

Explanation:

Answer:

specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree. The units of specific heat are usually calories or joules per gram per Celsius degrees.

Explanation:

the heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree).

The molar mass of the given gas is equal to 68.48 g.

The ideal gas law can be described as an equation of the state of a hypothetical perfect gas. This equation can be represented as the product of the volume and pressure of one-mole perfect gas is equal to the product of the universal gas constant and absolute temperature of that gas.

The mathematically, ideal gas equation can be written as follows:

PV = nRT

Where n is the moles of gas, P is the pressure,  V is the volume of the gas,  and R is the gas constant.

Given, the volume of collected gas, V = 165 ml = 0.165 L

The temperature of the gas, T = 27° C = 273 + 27 = 300 K,

The pressure of gas, P = 765 mmHg = 0.99 atm

The value of the gas constant, R = 0.082 atm L /K mol

Substituting the values V, R, P, and T in the equation, we get:

The number of moles of the gas, n = PV/RT

n = 0.99 ×0.165/(0.082 × 300)

n = 0.0066 mol

The molar mass of the gas = 0.452/ 0.0066 =68.48 g/mol

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Answer:

c

Explanation:

it's correct I think and hope

Answer:

A is the right answer.. .............

Answer:

increasing the positive charge of the positively charged object and increasing the negative charge of the negatively charged object would make the oppositely charged objects attract each other more.

Answer:

protons and neutrons are found in nucleus

Answer:

B.Convection

the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.

Answer:

B.

Explanation:

Answer:TRUE

Explanation:

The reaction HNO₃ + F⁻ ⇆ NO₃⁻ + HF is an equilibrium reaction.

Reaction equilibrium is a condition where the components of the reactants and reaction products remain in the system, in a state of equilibrium the rate of the reaction to the right is equal to the rate of the reaction to the left.

In general, Bronsted-Lowry defines acids and bases as follows.

                       HNO₃ (aq) + F⁻ (aq) ⇆ NO₃⁻  (aq) + HF (aq)

Proton handover in the above reaction is:

In the above reaction, F⁻ gives 1 proton (H⁻) to NO₃⁻. So, NO₃⁻is the base, while HF is the acid.

The reaction between HNO₃ and F forms two acid-base conjugates, namely the HNO₃/F⁻ conjugation pair and the NO₃⁻/HF conjugation pair.

So, this reaction is balanced.

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One mole of aluminum  contains 6.02 × 10²³ Al  particles. One mole of Al weighs 27 g. Hence 4.60 × 10²¹ Al particles or 0.007 moles weighs 0.208 g.  

One mole of a substance is its amount containing 6.02 × 10²³  atoms or molecules. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.

Similarly one mole of every compound contains 6.02 × 10²³ molecules. The mass of one mole of compound is called its molar mass. Similarly mass of one mole of an element is called its atomic mass.

Al is 13th element in periodic table. Al is a metal.  One mole of Al contains 6.02 × 10²³ Al  atoms . Hence number of moles of   4.60 × 10²¹ Al particles is:

4.60 × 10²¹/ 6.02 × 10²³  = 0.0077 .

atomic mass of Al = 27 g/mol.

Then mass of 0.0077 moles =  0.0077 × 27 = 0.208 g

Therefore, the mass of  4.60 × 10²¹ Al particles is 0.208 g.

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The valency of magnesium is 2 because it has two valence electrons in its outermost shell. Magnesium belongs to the second group of the periodic table, which means it has two electrons in its outermost shell or valence shell. In order to achieve a stable configuration, magnesium tends to lose these two valence electrons to form a positively charged ion with a charge of 2+. This makes magnesium a bivalent or divalent element with a valency of 2.

Answer:

Because the outer shell of magnesium contains 2 atoms

Answer:

LiOH is soluble. Na2CO3 is soluble. Cu(OH)2 is insoluble.

Explanation:

LiOH is soluble. Na2CO3 is soluble. Cu(OH)2 is insoluble.

Answer:

O₂

Explanation:

A quick way to determine Limiting Reactant => divide moles of each substance given in problem by respective coefficient of balanced equation ... the smaller resulting value is the Limiting Reactant.

                  2H₂        +         O₂        => 2H₂O

Given:   3 moles H₂       1mole O₂

=>            3/2 = 1.5             1/1 = 1

=>   O₂ is Limiting Reactant

The pH of the solution, which is set at 3, depends on the kinds and amounts of glycine present in the solution as well as the pka of the NH2 group, which ranges from 9 to 78. pH = equivalent = 9.78, thus

What is glycerine's advantage?

Glycerine, an amino acid, provides a wide range of incredible health benefits. Your body needs glycerine to make essential compounds including glutathione, creating, and collagen. This amino acid may also protect your liver from the negative effects of alcohol while improving your heart health and sleep.

who shouldn't consume glycerin?

A single amino acid should not be consumed in large amounts over a lengthy period of time. Avoid consuming isolated amino acids in large amounts without first talking to a doctor. Glycine supplements shouldn't be taken by women who are pregnant or breastfeeding.

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Answer:

Plant A

Explanation:

KH2PO4 is a more suitable choice as a buffer because it has a greater buffering capacity due to the presence of the weak acid and its conjugate base.

KHPo4 is not considered an effective buffer compared to KH2PO4 due to its limited buffering capacity. The effectiveness of a buffer is determined by the concentration and dissociation properties of its conjugate acid-base pair.

KH2PO4 is a salt composed of the weak acid H2PO4- and its conjugate base HPO4^2-. In an aqueous solution, KH2PO4 can dissociate to release H+ ions from the H2PO4- component, which acts as a weak acid, and the HPO4^2- component can accept H+ ions, acting as a weak base. This allows KH2PO4 to effectively resist changes in pH when small amounts of acid or base are added to the solution.

On the other hand, KHPo4 consists of the strong acid H3PO4 and the weak base HPO4^2-. H3PO4 fully dissociates in water, providing a large concentration of H+ ions, making it difficult for the HPO4^2- to effectively act as a base and maintain pH stability.

Therefore, KH2PO4 is a more suitable choice as a buffer because it has a greater buffering capacity due to the presence of the weak acid and its conjugate base.

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The enthalpy change of the reaction C(diamond) → C(graphite) is -2.9 kJ.

The given information is ΔHrxn for the reaction C(diamond) → C(graphite) can be calculated with the given equations:Equations:  C(diamond) + O2(g) → CO2(g) ΔH = −395.4 kJ  2 CO2(g) → 2 CO(g) + O2(g) ΔH = 566.0 kJ  C(graphite) + O2(g) → CO2(g) ΔH = −393.5 kJ  2 CO(g) → C(graphite) + CO2(g) ΔH = −172.5 kJThe required reaction can be obtained by adding the equations (1) and (4), as follows:C(diamond) + O2(g) + 2CO(g) → C(graphite) + 3CO2(g)Addition of the two equations (1) and (4) results in a reaction whose products are C(graphite) and CO2.

To get the final equation that involves only the required reactants and products, the equation (2) should be added, which consumes CO2 and produces O2, as shown below:C(diamond) + O2(g) → CO2(g)  ΔH = −395.4 kJ [eq. (1)]  2 CO(g) → C(graphite) + CO2(g)  ΔH = −172.5 kJ [eq. (4)]  2 CO2(g) → 2 CO(g) + O2(g)  ΔH = 566.0 kJ [eq. (2)]  C(diamond) + O2(g) + 2CO(g) → C(graphite) + 3CO2(g)  ΔHrxn=ΣΔHf(products)−ΣΔHf(reactants)  ΔHrxn=[(3 mol CO2)(-393.5 kJ/mol) + (1 mol C(graphite))(0 kJ/mol)] − [(1 mol C(diamond))(0 kJ/mol) + (1 mol O2)(0 kJ/mol) + (2 mol CO(g))(−172.5 kJ/mol)] − [(2 mol CO2)(566.0 kJ/mol)]  ΔHrxn=−2.9 kJ.

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The best way to measure the pH of a natural solution while out in a forest is to use a portable pH meter or pH test strips specifically designed for field use. These instruments provide accurate and reliable pH measurements and are convenient for outdoor applications.

1. Prepare the necessary equipment: Before heading out to the forest, gather the required tools. You will need a portable pH meter or pH test strips, as well as the necessary reagents or calibration solutions if using a pH meter.

2. Collect the sample: Locate the natural solution you want to measure the pH of, such as a stream, pond, or soil. Use a clean container to collect a representative sample of the solution.

3. Calibrate the pH meter (if applicable): If you are using a portable pH meter, it is essential to calibrate it before taking measurements. Follow the manufacturer's instructions to calibrate the meter using the provided calibration solutions.

4. Conduct the measurement: For pH meters, immerse the electrode into the collected sample. Allow some time for the reading to stabilize, and then record the pH value indicated on the meter's display.

5. Using pH test strips: If you are using pH test strips, dip the strip into the collected sample for the recommended amount of time. Remove the strip and compare the color change with the provided color chart. Determine the corresponding pH value from the chart.

6. Repeat for accuracy: To ensure reliability, repeat the measurement process at least once and compare the results. This step helps confirm the accuracy of your measurements.

7. Record and analyze the data: Note down the pH values obtained and any relevant observations. Analyze the data as needed for your research or monitoring purposes.

By following these steps and using the appropriate equipment, you can effectively measure the pH of a natural solution while in a forest setting.

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Based on the reactivity of the metals:

The ability of metals to displace hydrogen from dilute acids depends on the reactivity of the metal.

Reactive metals such as zinc and magnesium which occur higher than hydrogen in the activity series of metals will displace hydrogen from dilute acids such as dilute hydrochloric acid.

Copper cannot displace hydrogen from acids because it is less reactive than hydrogen.

The rate of reaction increases with increase in concentration of the acid.

Therefore, no reaction occurs for the copper strips in test tubes 3 and 6.

Hydrogen is displaced by the magnesium strips in test tubes 1 and 4, with the reaction more vigorous in the acid of higher concentration.

Hydrogen is displaced by the zinc strips in test tubes 2 and 5, with the reaction more vigorous in the acid of higher concentration.

In conclusion, reactive metals such as magnesium and zinc displace hydrogen from acids while a less reactive metal such as copper do not.

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Answer:76 grams

Explanation:

Fe+H₂SO₄-->FeSO₄+H₂

For one mole of Fe we get 1 mole of feso4, therefore for 0.5 moles of Fe we get 0.5 moles of feso4.

The molar mass of feso4 is AFe+AS+4AO(A is atomic mass)

56+32+4*16=152grams/mole

Now, we need to multiply the number of moles by the molar mass to get the mass that reacts

152*0.5=76 grams

To calculate the percent yield of a reaction, you have to calculate limitant and excess first of the reaction:

6CO2 + 6H2O + light -> C6H12O6 + 6O2

We have 18.6 moles of CO2 and 238g of H2O

Finding the number of moles of water will help us find the limitant of the reaction

nH2O = mH2O/Molar mass of H2O

nH2O = 238g/18.01g/mol

nH2O = 13.2 moles

So if we have 6 moles of water we will end up with 1 mole of C6H12O6, when we have 13.2 moles, we will have 2.2 moles of C6H12O6

6moles = 1 mol

13.2 moles = x

x = 2.2 moles

The molar mass of C6H12O6 is 180.156 for each mole, since we have 2.2 moles, the final mass will be 396.34 grams

To find the percent yield we have to calculate the actual yield divided by the theoretical yield and then multiply by 100

% yield =( 30g/396.34g) * 100

% yield = 7.6%

Polar molecules dissolve as well as miscible in polar solvents, while nonpolar molecules dissolve and miscible in nonpolar solvents.

Polarity is indeed a division of electric charge in chemistry that results in a molecule and its chemical groups possessing and electric dipole moment with a negative charges end as well as a positive charge end.

Atoms prefer to adopt the configuration of noble gases in order to achieve stability. As a result, we may deduce that chemical bonding was responsible for atom stability and the formation of molecules. Polar molecules dissolve as well as miscible in polar solvents, while nonpolar molecules dissolve and miscible in nonpolar solvents.

Therefore,  polar molecules dissolve as well as miscible in polar solvents, while nonpolar molecules dissolve and miscible in nonpolar solvents.

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