Water is homogeneous substance true or false

There are 1 lone pairs of electrons are in the ion OH⁻

Since oxygen creates two bonds, we know that two electrons are required to create those two bonds. There are now just two electron pairs remaining that are not involved in bonding. Oxygen thus contains two lone pairs.

The O and H atoms are connected by a solitary covalent link. The oxygen atom has a net -1 charge, which normally manifests as the whole charge on the OH- ion. On the O atom in the OH- Lewis structure, there exist lone electron pairs.

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A hypothesis is a proposed explanation or prediction based on limited evidence or observations, which can be tested through further investigation or experimentation. It should be specific, testable, and based on existing knowledge.

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Exothermic refers to chemical interactions that aerobic respiration. Combustion reactions release higher energy. Endothermic refers to atoms and molecules that either use or absorb reactive power.

A chemical process known as an endothermic releases energy as heat or light. It is an endothermic reaction's opposite. Chemical equation expressed as reactants + products + energy. An reaction mechanism is one in which electricity is given off as light or warmth.

A response is deemed to be exothermic if it produces heat while also undergoing a net decrease in basic enthalpy change. Samples include those type of combustion, iron rust, including water froze. Exothermic processes are those that discharge heat and energy into the surroundings.

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The differences between each of the pair is a. secondary and tertiary protein structures of protein.

a. No sharp dividing line exists between

secondary and tertiary structures. Secondary structure refers to the spatial arrangement of amino acids close to one another on a polypeptide chain, whereas tertiary structure refers to the three-dimensional arrangement of all atoms of a polypeptide chain. Among the most important factors in maintaining 3° structure are disulfide bonds, hydrophobic interactions, hydrogen bonding, and salt linkages ; Secondary structure is mainly defines by H-bonding between amino acids in localized regions of a polypeptide or protein

b. Essential amino acids cannot be made by metabolic process of human body, Essential amino acids can be synthesized by human body.

c. The amino acids are divided into 2 categories: those with nonpolar side chains are Non-polar amino acids ( exp. Alanine, Leucine ) , and with polar side chains like acidic side chains ( Aspartic acid) , basic side chains (lysine) and -OH/-SH groups (serine) in side chains are Polar amino acids.

d. A molecule containing two amino acids joined by an amide bond (-CONH-) is called a dipeptide. Those containing 3 amino acids

are called tripeptides. ( di-, tri- indicates No. of Amino acids )

e. Collagen consists of a triple helix made of the repetitious amino acid sequences , it is tertiary structures, whereas a-Helix is Secondary structure.

f. a-Helix, is a type of secondary structure in which a section of polypeptide chain coils into a spiral, most commonly a righthanded spiral. b-Pleated sheet is also

a type of secondary structure in which sections of polypeptide chains are aligned

parallel or antiparallel to one another.

g. Quaternary structure, is The arrangement of polypeptide monomers into

a noncovalently bonded aggregate. Many proteins or polypetides in tertiary structure constitues Quaternary structure.

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Answer:

3.75 g/mL

Explanation:

Density can be calculated using the following formula:

Density = mass (g) / volume (mL)

You have been given the mass of the mineral sample (75 g). To find the volume, you need to determine the amount of space that the sample takes up when it is placed in the water. This can be done by subtracting the initial water volume from the final water volume.

Volume = Final - Initial

Volume = 40 mL - 20 mL

Volume = 20 mL

Now, you can calculate the density of the mineral sample.

Density = mass / volume

Density = 75 g / 20 mL

Density = 3.75 g/mL

Answer:

Explanation:

Givens

The volume is the tricky part of this question. You are using the graduated cylinder to measure volume. The rise in the reading of the graduated cylinder = the volume of the sample.

Volume = 40 mL - 20 mL = 20 mL

Mass = 75 grams

Formula

Density = mass / volume

Solution

Density = 75 / 20 = 3.75

Answer

Density = 3.75

The solid starts melting at 0°C. The heating curve for water shows the temperature changes as heat is added to the substance.

The horizontal flat line on the graph represents the phase change from solid to liquid. In the case of water, this occurs at 0°C. This is known as the melting point, or the temperature at which a substance changes from a solid to a liquid at atmospheric pressure.

It is an important characteristic of a substance and can be used to identify it. It is also important in many industrial processes, such as melting metals for casting. Therefore, understanding the melting point of a substance is crucial in various fields of science and technology.

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The chemical formula for magnesium perchlorate is Mg(ClO4)2, which contains 1 magnesium atom (Mg), 2 chlorine atoms (Cl), and 8 oxygen atoms (O).

To calculate the number of moles of each element in 4.20 moles of Mg(ClO4)2, we need to use the mole ratios from the chemical formula.

Moles of Mg:

In one mole of Mg(ClO4)2, there is one mole of Mg atoms. Therefore, in 4.20 moles of Mg(ClO4)2, there are 4.20 moles of Mg atoms.

Moles of Cl:

In one mole of Mg(ClO4)2, there are 2 moles of Cl atoms. Therefore, in 4.20 moles of Mg(ClO4)2, there are 2 x 4.20 = 8.40 moles of Cl atoms.

Moles of O:

In one mole of Mg(ClO4)2, there are 8 moles of O atoms. Therefore, in 4.20 moles of Mg(ClO4)2, there are 8 x 4.20 = 33.6 moles of O atoms.

So the number of moles of Mg, Cl, and O atoms in 4.20 moles of Mg(ClO4)2 are: 4.20, 8.40, and 33.6, respectively.

Answer:

Explanation:

7.50 mol Mg

(ClO4)2

contains:

7.50 mol Mg atoms

15.0 mol Cl atoms

60.0 mol O atoms

1 mol Mg(ClO4)2

contains

1 mol Mg atoms, 2 mol Cl atoms, and 8 mol O atoms.

The student expected to get exactly 3.5 grammes of Chromium (III) oxide from adding 1.75 grammes of Chromium trinitrate and 1.75 grammes of Sodium oxide. To create the needed amount of Chromium oxide.

To get the mass per mole, divide the reactant's mass by its molecular weight. As an alternative, we might multiply the millilitres of the reactant solution by the grammes per millilitre of the liquid solution. Next, divide the outcome by the reactant's molar mass.

This is because the chemical equation for the reaction between Chromium trinitrate and Sodium oxide is not balanced to produce Chromium(III) oxide.

2Cr(NO₃)₃ + 3Na₂O → Cr₂O₃ + 6NaNO₃

From this balanced equation, we can see that for every 2 moles of Chromium trinitrate, we need 3 moles of Sodium oxide to produce 1 mole of Chromium(III) oxide. This means that the amounts of Chromium trinitrate and Sodium oxide required to produce 3.5 grams of Chromium(III) oxide are:

Amount of Chromium trinitrate = (2/3) x (3.5 grams / molar mass of Chromium trinitrate) = 1.53 grams

Amount of Sodium oxide = (3/2) x (3.5 grams / molar mass of Sodium oxide) = 2.26 grams

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Explanation:

3+3+6=12 is the three numbers adding up to 12

The solution that will have the most successful collisions are:

B. A solution at high concentration and high temperature

It is used to predict the rates of chemical reactions, particularly for gases. The collision theory is based on the assumption that for a reaction to occur it is necessary for the reacting species (atoms or molecules) to come together or collide with one another.

A decrease in temperature would have the opposite effect. With an increase in temperature, there is an increase in the number of collisions.

Thus, option B is correct.

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The mass of krypton tetrachloride that can be produced assuming 100% yield is mathematically given as

molar mass=33.29g

Generally, the equation for ideal gas is mathematically given as

PV=nRT

Therefore

n=(0.50)(15.)/0.082*623

n=0.147mol

Hence for clorine

n=0.441mol

Given the reaction

Kr+2cl2---->KrCL4

Hence

molar mass=225.60*0.147

molar mass=33.29g

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Answer:

c)

Explanation:

acidic oxides are formed

metal oxides and basic oxides are basically the same.

Answer:

The Relationship between Pressure and Volume: Boyle's Law

As the pressure on a gas increases, the volume of the gas decreases because the gas particles are forced closer together. Conversely, as the pressure on a gas decreases, the gas volume increases because the gas particles can now move farther apart

In the labelling of the circles; reaction A is a chemical reaction while reaction B is a nuclear reaction.

We know that in chemistry, the idea of change is quite central to our discussion. The change that we are talking about could be a chemical change or a physical change.

We have two circles that are in the Venn diagram that we have in the question. Before we can be able to label the two of the circles well we must have to remind ourselves of the differences between a chemical reaction and a nuclear reaction.

A chemical reaction result in the formation of new chemical species while the nuclear reaction would lead to the formation of new elements and the energy that is released in a nuclear reaction is far higher than the energy that is released from a chemical reaction.

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Answer:

pH = 10.113

Explanation:

Here, we can find pOH first:

pOH = \(-log([OH^-])\) = 3.886.

Then, we can find pH which is 14 - pOH. We then get the answer above.

Then, we can find pH which is 14 - pOH. We then get the answer above.

The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Thus the pH of 1.3×10⁻⁴  M  bleach solution is 10.62.

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

The concentration of bleach solution  is 1.3×10⁻⁴ M

Concentration of OH⁻=1.3×10⁻⁴ M

Mathematically,

pOH=-log[OH⁻]

Substituting the values

pH=-log[1.3×10⁻⁴]

    =  3.886.

pH+ POH=14

pH=14-3.886.=10.62

Therefore,  the pH of 1.3×10⁻⁴  M  bleach solution is 10.62.

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Answer:

Explanation:

I think you forgot to attach an image here!

Answer:

+2

Explanation:

Because the charge of the chloride ion is negative, that means that the charge of the magnesium ion must be positive since cations and anions go together, not cation and cation nor anion and anion. Using the "reverse criss-cross method", since the subscript of Mg is 1, that means that this is the lowest whole number ratio so we don't need to worry about simplifying. Therefore, since the charge of Cl is 2, the answer is +2.

to generate steam which act on copper

Answer:

The object that is the most dense is 1000 grams per cubic milimeter.

Explanation:

A cubic meter is equal to 1,000,000,000 cubic milimeters, 1 kilogram is equal to 1000 kilograms. First, we convert each quantity to grams per cubic milimeter:

a) \(1\,\frac{kg}{m^{3}}\times \frac{1,000\,g}{1\,kg} \times \frac{1\,m^{3}}{1,000,000,000\,mm^{3}} = \frac{1\,g}{1,000,000\,mm^{3}}\)

b) \(1\,\frac{g}{m^{3}}\times \frac{1\,m^{3}}{1,000,000,000\,mm^{3}} = \frac{1\,g}{1,000,000,000\, mm^{3}}\)

c) \(1\,\frac{kg}{mm^{3}}\times \frac{1,000\,g}{1\,kg} = 1000\,\frac{g}{mm^{3}}\)

A greater density means that an object is more dense, therefore, the object that is the most dense is 1000 grams per cubic milimeter.

Answer:

A

Explanation:

Took at test on this and my teacher said it was right, hopefully I remembered right, also I answered ur other question like this I think lol

The answer is: To demonstrate that the liquid is a mixture, the scientist can perform the chromatography.

Mixture: They are formed when two elements or compounds are combined physically and not chemically.

What are the types of mixtures?

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Answer: 1.73M

Explanation:

Molarity= moles of solute/ total volume of solution

= 3.51 mol / 2.03 L

= 1.729 M

= 1.73 M

The final value for the enthalpy change of the formation of CO2 and 2H2O from their elements (C, H2, and O2) would be -1410 kJ per mole of CO2 and 2 moles of H2O formed.

The enthalpy change (ΔH) for the reaction CO2 + 2H2O → H2CO3 can be calculated by multiplying the stoichiometric coefficients of the balanced equation by the enthalpy values of the corresponding compounds involved in the reaction.

In the given reaction, the enthalpy change is -1410 kJ. However, it's important to note that this enthalpy change corresponds to a specific reaction and may not directly apply to the formation of CO2 and 2H2O from another reaction or process.

If we assume that the reaction is the formation of one mole of CO2 and two moles of H2O, we can say that the enthalpy change for this specific formation reaction is -1410 kJ.

Therefore, the final value for the enthalpy change of the formation of CO2 and 2H2O from their elements (C, H2, and O2) would be -1410 kJ per mole of CO2 and 2 moles of H2O formed.

It's worth mentioning that the enthalpy change can vary depending on the specific conditions (temperature, pressure, etc.) and the reactants involved in the reaction. Therefore, it's crucial to specify the conditions and reaction context when referring to enthalpy values.

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The substance begins to boil at 2750⁰C, the substance begins to melt at 1500⁰C, the temperature at which the substance is both a liquid and a gas at 2750⁰C, temperature is the substance both a solid and a liquid​ at 1500⁰C.

Heating curves are the graphical correlations between heat added to a substance. When viewed from a cooling perspective, ie. loss of heat, it is the cooling curve.

The gradient of the cooling curve is related to the heat capacity, the thermal conductivity of the substance, and the external temperature. The more heat is required to change the temperature of the substance, the slower it cools, so the smaller the gradient of the curve. The higher the thermal conductivity, the faster heat is transferred, so the faster the substance cools.

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Changing to a less polar solvent and increasing the pressure of nitrogen will increase the solubility of nitrogen.

Lowering the temperature of the solution will reduce the kinetic energy of the gaseous particles, making it less likely for them to exit the liquid phase. As a result, the solubility of a gas in a liquid will increase. With rising temperature, gases become less soluble in liquids. In contrast, warming the solution causes thermal energy to be released that overcomes the forces of attraction between the molecules of the solvent and the gas, reducing the gas' solubility and moving the reaction in Equation 4 to the left. Water does not react with nitrogen gas. Water does help it dissolve. At 20 and 1 bar of pressure, nitrogen dissolves in liquid at a rate of about 20 mg/L. Depending on the molecule, nitrogen might be soluble in different ways.

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Answer:

A

Explanation:

The number of protons and neutrons of an element is the same. the electrons are the only thing that can differ.  The atomic number equal the protons and neutrons.

Balance the following chemical equations:

1. N2 + 3 H2 → 2 NH3

Ex: Synthesis reaction

2. 2 KClO3 → 2 KCl + 3 O2

Single Replacement reaction

3. 2 NaF + ZnCl2 → ZnF2 + 2 NaCl

Decomposition reaction

4. 2 AlBr3 + 3 Ca(OH)2 → Al2(OH)6 + 6 CaBr2

Double Replacement reaction

5. 2 H2 + O2 → 2 H2O

Combustion reaction

6. 2 AgNO3 + MgCl2 → 2 AgCl + Mg(NO3)2

Synthesis reaction

7. 2 Al + 6 HCl → 2 AlCl3 + 3 H2

Decomposition reaction

8. C3H8 + 5 O2 → 3 CO2 + 4 H2O

Combustion reaction

9. 2 FeCl3 + 6 NaOH → Fe2O3 + 6 NaCl + 3 H2O

Double Replacement reaction

10. 4 P + 5 O2 → 2 P2O5

Synthesis reaction

11. 2 Na + 2 H2O → 2 NaOH + H2

Single Replacement reaction

12. 2 Ag2O → 4 Ag + O2

Decomposition reaction

13. C6H12O6 + 6 O2 → 6 CO2 + 6 H2O

Combustion reaction

14. 2 KBr + MgCl2 → 2 KCl + MgBr2

Double Replacement reaction

15. 2 HNO3 + Ba(OH)2 → Ba(NO3)2 + 2 H2O

Double Replacement reaction

16. C5H12 + 8 O2 → 5 CO2 + 6 H2O

Combustion reaction

17. 4 Al + 3 O2 → 2 Al2O3

Synthesis reaction

18. Fe2O3 + 2 Al → 2 Fe + Al2O3

Single Replacement reaction

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The statement "increasing the force will increase the moment" is true.

This is because the moment is a measure of the turning effect of a force on an object about a pivot point. It is defined as the product of the force and the perpendicular distance between the force and the pivot point. The unit of moment is the newton-meter (Nm) or the joule (J).When a force is applied to an object, it will produce a moment about the pivot point if the force is not acting along the same line as the pivot point. The magnitude of the moment depends on the force applied and the distance of the force from the pivot point. As the force increases, the moment also increases, provided that the distance from the pivot point remains constant. Conversely, if the force remains constant, but the distance from the pivot point increases, the moment also increases. This is because the perpendicular distance is directly proportional to the moment, meaning that a longer distance results in a larger moment.Therefore, it can be concluded that increasing the force applied to an object will increase the moment produced about a pivot point.

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Answer:

a) alternate interior angles are congruent

Explanation:

on edgen