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Answer:

bases which are not soluble in water do not give the hydroxyl ions and so they are treated differently from soluble bases called alkalis.

Answer:

Because the exact position of the electron is not known,it must be assumed that the electron takes up the entire space in an orbital.

Explanation:

Answer:

i believe it's D

Explanation:

Answer:

D

Explanation:

Answer: (1) Hydroxide ion

Explanation: Because LiOH is a base hydroxide ion is OH-

The answer is hydroxide ion.

Using this equation, we find the pH of pure water to be 7. This is considered to be neutral on the pH scale. The pH can either go up or down depending on the change in hydronium concentration. If the hydronium concentration increases, the pH decreases, causing the solution to become more acidic.

When an excess base is dissolved in a solution of sodium hydroxide. Sodium hydroxide dissociates into OH- ions and when the number of OH- increases then concentration also increases because concentration is the number of OH- ions present per unit volume.

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Answer:

They have different number of neutrons.

Explanation:

The answer to the statement " Measuring a chemical property is nondestructive " is true.

The chemical properties of substances such as boiling point, melting point, pH, reactivity, combustion, density, flammability, toxicity, solubility or even oxidation states are different characteristics which one can test for in a substance and does not affect the substances themselves in the process.

That being said, when you test for measure a chemical such as from the any of the ones above, it means you want to see or identify or observe the chemical composition of the substance. This won't affect the substance.

For example, when measuring the pH of a substance, that is; measuring the degree of acidity or alkalinity of a substance, it does not affect the substance in the test but reveals to us more about the chemical level or composition of the substance in details.

So therefore, we can now confirm that testing or measuring the chemical features of a substance is harmless to the substance itself.

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The molecular formula of a compound is C₂H₂O₄.

Take 100 grams of compound:

1) ω(C) = 26.7% ÷ 100% = 0.267

m(C) = ω(C) × m(compound)

m(C) = 0.267 × 100 g.

m(C) = 26.7 g.

n(C) = m(C) ÷ M(C).

n(C) = 26.7 g ÷ 12 g/mol.

n(C) = 2.22 mol; amount of carbon

2) ω(H) = 2.2 % ÷ 100% = 0.022

m(H) = 0.022 × 100 g.

m(H) = 2.2 g.

n(H) = 2.2 g ÷ 1 g/mol.

n(H) = 2.2 mol; amount of hydrogen

3) ω(O) = 71.1 % ÷ 100%.

ω(O) = 0.711

m(O) = 0.711 × 100 g

m(O) = 71.1 g

n(O) = 71.1 g ÷ 16 g/mol

n(O) = 4.4 mol; amount of oxygen

4) n(C) : n(H) : n(O) = 2.2 mol : 2.2 mol : 4.4 mol /2.2 mol.

n(C) : n(H) : n(O) = 1 : 1 : 2

M(CHO₂) = 45 amu; empirical formula

90 amu ÷ 45 amu = 2 CHO₂

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Boyle's Law states that the volume of a fixed amount of gas is inversely proportional to its pressure at constant temperature. This means that when the pressure of a gas increases, its volume decreases, and vice versa, as long as the temperature remains constant.

Boyle's Law states that the volume of a fixed amount of gas is inversely proportional to its pressure at constant temperature. This means that if the pressure of a gas is increased while the temperature remains constant, the volume of the gas will decrease. Similarly, if the pressure is decreased, the volume will increase. This relationship can be expressed mathematically as PV = k, where P is pressure, V is volume, and k is a constant.
                                                         Boyle's Law only applies when the temperature is constant. If the temperature of a gas changes, its volume will also change according to another law called Charles's Law. Charles's Law states that the volume of a fixed amount of gas is directly proportional to its temperature in Kelvin at constant pressure. This means that if the temperature of a gas is increased, its volume will also increase proportionally.
                                          Another important concept related to gases is Dalton's Law of Partial Pressures. This law states that the total pressure of a mixture of gases is the simple sum of the partial pressure of all of the gaseous compounds. This means that if there are multiple gases in a container, the pressure of each gas can be calculated independently based on its partial pressure.

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Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

Answer:

C. The greater it’s inertia

Explanation:

The most likely tripeptide to be soluble in a hydrophobic solvent like benzene is option (c) N - proline - phenylalanine - leucine - C.

This is because all three amino acids in this tripeptide possess hydrophobic side chains. Proline has a unique cyclic structure, while phenylalanine and leucine have large, nonpolar side chains. These characteristics make the tripeptide more compatible with organic solvents, as they promote hydrophobic interactions.

In contrast, the other tripeptides contain amino acids with polar or charged side chains, making them less likely to be soluble in a hydrophobic solvent. For example, options (b) and (d) have lysine and arginine, which are positively charged, and options (e) and (d) have glutamate and aspartate, which are negatively charged. These charged amino acids will preferentially interact with polar solvents like water, reducing their solubility in benzene.

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Answer:

Various compounds made of different forces between molecules

Explanation:

In an experiment, the independent variable is the variable that is changed or manipulated by the experimenter in order to effect a measurable response.

According to this question, a student compares the boiling point of substances having different intermolecular forces. This means that the student uses different substances with different intermolecular forces and measures the boiling point of each, which depends on the intermolecular forced in them. Hence, the independent variable in this experiment is the VARIOUS COMPOUNDS MADE OF DIFFERENT FORCES BETWEEN MOLECULES.

The physical property of both drinks that we can calculate based on the data obtained is density

The density formula and the procedure we will use is:

d = m/v

Where:

Information about the problem:

Applying the density formula, we get:

d(regular coca cola) = m(regular coca cola)/v(regular coca cola)

d(regular coca cola) = 384 g / 380 ml

d(regular coca cola) = 1.0105 g/ml

d(diet coca cola) = m(diet coca cola)/v(diet coca cola)

d(diet coca cola) = 370 g / 380 ml

d(diet coca cola) = 0.9737 g/ml

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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Answer:

0.058M is molarity of the solution

Explanation:

Molarity is defined as the ratio between the moles of solute (In this case, MgSO₄) and the liters of solution.

In the problem:

Moles MgSO₄: 0.32 moles

Liters solution: 5.5L

Molarity is:

0.32 moles / 5.5L =

0.058M is molarity of the solution

Litmus paper and Phenolphthalein are both indicators. This means they will change colour in the presence of an acid or a base.

Litmus paper turns blue in a base and remains red when it is in contact with an acid or neutral solution. Phenolphthalein turns pink in a base, but is coluorless in an acid or neutral solution.

Answer:

Answer:

Solid

Explanation:

The reaction rate for the medium enzyme concentration is 0.4 absorbance units per minute.

To calculate the reaction rate, we need to subtract the initial absorbance reading from the final absorbance reading and divide by the time that transpired between the two readings.

For the medium enzyme concentration, the initial absorbance reading is 8.0 and the final absorbance reading is 12.0. The time between these two readings is 60 minutes.

Therefore, the reaction rate for the medium enzyme concentration is 0.4 absorbance units per minute.

Here is the calculation:

```

reaction rate = (final absorbance reading - initial absorbance reading) / time

= (12.0 - 8.0) / 60 minutes

= 0.4 absorbance units per minute

```

The reaction rate for the other enzyme concentrations can be calculated in the same way. The results are as follows:

* Slow enzyme concentration: 0.2 absorbance units per minute

* High enzyme concentration: 0.6 absorbance units per minute

As you can see, the reaction rate increases as the enzyme concentration increases. This is because there are more enzyme molecules available to catalyze the reaction at higher enzyme concentrations.

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Answer:

The biological pump or the marine carbon pump is the title for multiple processes leading to separation of carbon from multiple sources of water. Biological pumping is partially responsible for the cycling of organic matter. This process can lead to loss of contact between carbon and the atmosphere for thousands of years.

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When a can of coke is removed from the fridge and then warmed up to room temperature, the entropy of the beverage will increase.

We can define entropy as the disorderness of a system or the randomness of a particular system. The entropy of a system changes with a change in the temperature of the system.

As the temperature increases, the entropy of the system also increases and when the temperature is reduced, the entropy of the system also decreases. When a can of coke is kept in fridge, the entropy decreases as the temperature gets decreased.

As the can of the coke is taken out and warmed up to room temperature, the entropy increases with the increase in temperature as the randomness of the molecules increases.

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The compound that is composed of calcium and chlorine is CaCl₂

To know which of the compound that contains calcium and chlorine, we must know the symbol of calcium and chlorine. This is shown below:

Calcium is a group 2 element with atomic number of 20 and a symbol of Ca

Chlorine is a group 17 element with atomic number of 17 and a symbol of Cl

With the above information, we can determine the compound that contains calcium and chlorine as follow:

The compound that contains calcium and chlorine must have Ca and Cl in it.

Thus, the compound that contains calcium and chlorine is CaCl₂

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Answer:

Its the first one

Explanation:

4 mol is the highest of the Bunch and 4.0L is the lowest making the first answer the correct one

The element that is liquid at 305K and 1.0 atm is gallium (Ga), which corresponds to option (3).

Gallium is a metal that exhibits a relatively low melting point of 29.76°C or 302.91K. At room temperature, gallium is solid, but as the temperature increases, it undergoes a phase change and transitions into a liquid state. At 305K, which is above its melting point, gallium exists as a liquid.

Gallium's low melting point is due to its unique atomic structure. It has a relatively low number of valence electrons, which results in weak metallic bonding. The weak metallic bonds allow the atoms to move more freely, leading to a lower melting point compared to other metals.

In contrast, the other options do not meet the given conditions. Magnesium (Mg) is a solid at room temperature and has a higher melting point of 650°C or 923K. Fluorine (F) is a highly reactive gas at room temperature and has a boiling point of -188.12°C or 84.03K. Iodine (I) is a solid at room temperature and has a higher boiling point of 184.3°C or 457.45K.

Therefore, based on the given temperature and pressure conditions, gallium option (3) is the only element among the options that would be in a liquid state.

The question was Incomplete, Find the full content below:

Which element is liquid at 305K and 1.0 atm?

(1) magnesium

(2) fluorine

(3) gallium

(4) iodine

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Answer:

O2+H2 → H2O

become→zero to−2

∵ it will be reduced and oxidation state of H

2

becomes zero to +1 it will be oxidised.

∴ reaction will be redox

Explanation:

please mark me as brainalist

Answer:

  12.5 g/cm³

Explanation:

You want the density of a rock that has a mass of 125 g and displaces 10 mL of water in a graduated cylinder.

The balance shows a mass that is the sum of the readings on the different beams:

  20 +100 + 5 = 125

We presume the balance is measuring grams.

The graduated cylinder shows an increase in volume from 20 mL to 30 mL when the rock is added to the water. This means the rock has a displacement of ...

  30 mL -20 mL = 10 mL = 10 cm³

The density is found using the given formula:

  density = mass/volume

  density = (125 g)/(10 cm³) = 12.5 g/cm³

The density of the rock is 12.5 g/cm³.

Answer:

blue curve on edge :)

Explanation:

Answer:

Explanation:

D.

carbon and oxygen atoms mixed without being bonded together

Answer:In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory.

Explanation:

The equilibrium constant of the system is 11.3.

We know that the equilibrium constant shows the extent to which reactants are converted into products.

Now;

2NO2 ⇄ N2O4

[NO2] = 0.500 mol /1 L =  0.500 M

[N2O4] =  0.186 mol  /1 L =  0.186 M

The ICE table is;

          2NO2 ⇄ N2O4

I           0.5           0

C         -2x              +x

E          0.5 - 2x     0.186

The concentration of NO2 at equilibrium = 0.5 - 2(0.186) = 0.128

Keq =  0.186/( 0.128)^2

Keq = 11.3

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