When salt dissolves completely into water, which term is used to describe the water?

1. solute

2. solution

4. concentration

4. solvent

In 1904, J.J. Thomson published the Thomson model of the atom. The plum pudding model is often referred to as Thomson's model.

In 1897, he also made the electron discovery. Scientists Rutherford and Bohr subsequently refuted this theory. According to J.J. Thomson, an atom is a positively charged sphere with embedded negatively charged electrons.

Neils Bohr disproved it by demonstrating that any atom's mass is centred in its positively charged centre, while negatively charged electrons orbit the positive centre. In highly quantized energy levels, according to Bohr's theory, electrons orbit an atom's nucleus rather than being incorporated into it.

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MCQs as follows-

chlorophyll is the light-absorbing green coloured pigment that begins the process of photosynthesis, and Chloroplast is a membrane-bound organelle in green plant and algal cells that carries out photosynthesis and generates ATP for the use of plants.

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The number of protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200 is 79, 79 and 121 respectively.

Atomic number of an element is the number of protons in an atom of the element while the atomic mass is the sum of the protons and neutrons in the atom.

The electron number is equal to the number of protons in a neutral atom.

According to this question, the isotope of an element has an atomic number of 79 and a mass number of 200.

Therefore, the number of protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200 is 79, 79 and 121 respectively.

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The frequency of a photon with a wavelength of 360 nm frequency of a photon is 8.33 × 10¹⁴ s⁻¹.

Given,

The wavelength of photon = 360 nm or 3.60 × 10⁻⁷

three × 10⁸ m/s is the speed of mild.

We need to discover the frequency of a given photon.

The frequency of a photon is described as the wide variety of waves that pass via a set point in a unit of time.

therefore, f = c/λ

where f is the frequency, c is the velocity of light, and λ is the wavelength of the photon.

f = 3 × 10⁸/ 3.60 × 10⁻⁷

Or, f = 0.8333 × 10¹⁵ s⁻¹

Or, f = 8.33 × 10¹⁴ s⁻¹

Hence, the frequency of the photon is 8.33 × 10¹⁴ s⁻¹.

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yes ions add another atom

ions are electrically charged particles that can be created by either taking electrons away from neutral atoms to form positive ions or adding electrons to neutral atoms to produce negative ions. The quantity of protons remains constant during the formation of an ion.

Ionic bonds are defined as connections between atoms in which electrons are primarily transported from one atom to another. Since there is always some electron sharing between atoms, we say largely because the sharing in ionic bonds is relatively uneven. The bond has a stronger ionic character the more unequally the electrons are shared.

Between a metal and a non-metal, ionic bonding form. Ionic bonds, as opposed to covalent ones, involve the transfer of valence electrons between atoms.

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yes Ions can be combined with other atoms to create new elements or compounds.

However not all ions are atoms, an atom can be an ion.

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It is False that risk is defined as an inherent chemical or physical characteristic.

Risk is the probability that a person if exposed to a hazard will experience( or get harmed)  an adverse health effect, it also goes with situations with equipment of property loss or harmful effects on the environment.Many factors influence the degree of risk such as the nature of exposure, the severity of the effect,  how the person is been exposed, and so on.

Whereas the hazard word has a confusing definition, it refers to a physical or chemical characteristic that has the potential for causing damage to property, people, or the environment. Most of the time hazard gets combined with the word Risk.

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In calcium nitrate 0.502 mol are present no of moles of calcium ions Calcium ions=0.502 mol, nitrate ions= 1.004 mol, oxygen atoms =3.012 mol

Calcium nitrate Ca(NO3)2 = 0.502 mol

The required equation for the given question is below:

Ca(NO3)2 → 2N03- + Ca2+

Here two ion are present

2 nitrate ions per mole of Ca(NO3)2

1 calcium ion per mole of Ca(NO3)2

6 oxygen atoms per mole of Ca(NO3)2

Calcium ions therefore equal 0.502 mol,

Nitrate ions equal 2 x 0.502 mol = 1.004 mol

Oxygen atoms equal 6 x 0.502 mol = 3.012 mol

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To prepare 128.2ml of a 0.364 M aqueous solution of NaCl.the mass in grams, of NaCl need to use to make the solution is 2.723 gm.

Molarity is defined as the no. of moles of solute per liter of solution.

Here,

Molarity =  moles of solute / Liter of solution

0.36 M solution will contains 0.364 moles of NaCl.

therefore, volume of solution in L =  ( 128.2 / 1000 ) L × 1 L

                                                 = 0.1282 L

that means, it will contain, no. of moles of NaCl

= (0.1282 L of solution × 0.364 ) / 1 L of solution      

= 0.0466 moles of NaCl

now, molar mass of NaCl  = 58.44 g/mol    

so, 1 mol of NaCl has a mass of  58.44 g/mol

therefore, 0.0466 moles of NaCl will have mass of

= ( 0.0466 moles of NaCl × 58.44 g ) / 1 mole of NaCl

= 2.723 g

Thus,To prepare 128.2ml of a 0.364 M aqueous solution of NaCl .the mass in grams, of NaCl need to use to make the solution is 2.723 gm.

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If a capacitor is overcharged, the electrons from the terrible plate may be pulled through the insulation to the high-quality plate. the capacitor is stated to be shorted.

while you join a capacitor to DC voltage, the capacitor will price to this voltage, and the charging current will drop to zero.

You need to make certain the voltage isn't better than the capacitor’s  Shorting.

On AC, the capacitor will comply with the voltage, w/a put off. again, you need to make sure the voltage rating of the capacitor fits the voltage(In this situation peak voltage).

If the voltage is higher in either case-the capacitor may short.

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Answer:

C. to the left of the arrow

Explanation:

The reactants (the chemicals that initiate the chemical reaction) are represented on the left, while the products (the substances that result from the reaction) are represented on the right. An arrow sign ("→" commonly read aloud as "yields") separates the two.

Sorry if I'm wrong

Answer: C

Explanation:

C

The general molecular formula for alkanes is cnh2n 2. The general molecular formula for cycloalkanes with two rings CnH2n−2.

Cycloalkanes are hydrocarbons with a ring type structure. The reason of ring formation is because they are saturated compounds. The general formula of the cycloalkanes is CnH2n where n is the number of carbon atoms.

cyclopentane, Cyclobutane, cyclohexane, and cycloheptane, cyclooctane are some example of cycloalkanes and Cyclopropane is considered one of the smallest cycloalkanes.

Cycloalkanes have a lot of uses. They are used in the medical industry for the production of drugs. These compounds are also used in hair and food industries.

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Answer:

Fusion.

Explanation: fusion is a nuclear reaction in which smaller atoms fuse together to form heavier elements. This describes the fusion of hydrogen into helium.

Answer:

h20

Explanation:

science, 3 hydrogen and one oxygen make h2o

[tex]H_3O^+[/tex], hydronium ion is the name given to this molecule. Therefore, the correct option is option B among all the given options.

The smallest recognisable unit which which a pure material may be split while retaining its composition and chemical characteristics is a molecule, which is a collection of two or more atoms. Until portions consisting of tiny molecules are reached, the division of a sample for a substance onto progressively smaller parts does not result in a change with respect to its composition as well as its chemical characteristics. [tex]H_3O^+[/tex], hydronium ion is the name given to this molecule.

Therefore, the correct option is option B among all the given options.

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A gram of fat stores more energy than a gram of starch due to more C-H bonds  within fat molecules relative to starch molecules.

The energy released/stored by nutrients is known as calorific value.

The calorific value of a  substance is expressed in kilo calories(kcal).

1 kcal is defined the amount of energy required to raise the temperature of 1 kg of water by 1 °C.

The physiological calorific value of fats and carbohydrates is 9.0 kcal/g and 4.0 kcal/g respectively.

As it is evident from these values that the energy stored per gram of fat is more than the energy stored per gram of starch.

Now, the reason behind this difference in energies between these two molecules is due to the different number of C-H bonds present in them, as is evident from the adjoining images.

Therefore, A gram of fat stores more energy than a gram of starch due to more C-H bonds within fat molecules relative to starch molecules.

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The molar mass of compound tells you the mass of 1 mole of that substance. The percent by mass of y in x₂y₂ is 57.14%

Molar mass of a substance is the mass in grams of one mole of the compound. In a substance, the amount of entities present e.g. atoms, molecules, ions, is defined as a mole. A mole of any substance is 6.022×1023 molecules

In compound x₂y, the percentage mass of x is 60%. The percentage mass of y is 40 %. Let the compound  weighs M , 2 units of x weigh 0.6M, 1 unit of x weighs 0.3* M and one unit of y weight 0.4*M.

In the compound x2y2, the percentage mass of y is

0.4*2 ÷ (0.4*2 + 0.3* 2 ) = 8 ÷ (.8+.6) = 0.8 ÷ 1.4 = 57.14 %

The percent by mass of y in x₂y₂ is 57.14%.

Thus, the percentage by mass of y in x₂y₂ is 57.14.

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Explanation:

Oxygen has atomic number eight. This means that the nuclei of all oxygen atoms have eight protons. A neutral oxygen atom will also have eight electrons.

In an oxygen ion with a

2

−

charge, the number of protons is still 8, but the number of electrons is 10.

This results in the oxygen ion having an octet (8) of valence electrons.

Answer:

Lu

Hf

Ta

Explanation:

Lu- Lutecium
Atomic Number- 71
Atomic Mass-174.967

Hf- Hafnium
Atomic Number-72
Atomic Mass178.492

Ta- Tantalum
Atomic Number-73
Atomic Mass-180.948

The chemical elements that meet the criteria are Hafnium (Hf) and Tantalum (Ta).

The atomic number represents the number of protons in the nucleus of an atom, while the atomic mass represents the total mass of protons and neutrons in the nucleus of an atom.

Elements with atomic numbers greater than 70 are located in the bottom rows of the periodic table, known as the "lanthanides" and "actinides."

So, Atomic Number > 70 and Atomic Mass < 181.2 u

1. Hafnium (Hf) - Atomic Number: 72, Atomic Mass: 178.49 u

2. Tantalum (Ta) - Atomic Number: 73, Atomic Mass: 180.95 u

3. Tungsten (W) - Atomic Number: 74, Atomic Mass: 183.84 u

4. Rhenium (Re) - Atomic Number: 75, Atomic Mass: 186.21 u

Therefore, the chemical elements are Hafnium (Hf) and Tantalum (Ta).

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Answer:

Explanation: Solid to Solid mixtures

1. Iron+Sulphur

2. Pottasium Nitrate+Potassium Chlorate

3. Ammonium Chloride+Sodium Chloride

Solid to Liquid Mixtures

1. Salt+Water

2. Sand+Water

3. Calcium Carbonate+Water

Liquid to Liquid Mixtures

1. Alcohol+Water

2. Oil+Water

3. Kerosene+Water

Liquid to Gas Mixtures

1. Hydrogen+Oxygen

2. Hydrogen Chloride+Nitogen

3.Air (Air is a mixture of many gases)

Convincing evidence that entropy increased when the wall was removed, when the distribution of ball speeds evened out, and there was no longer a significant difference in distributions between the two boxes.

Entropy is just a measure of disorder and affects all aspects of our daily lives. If you add more energy by heating the gas, the amount of various possibilities for arranging the energy over the molecules increases.

For example, when a hot object is placed up-to-date with a chilly object, heat flows from the warmer one to the Entropy, never spontaneously from colder to hotter. If heat were to go away from the colder object and pass to the warmer one, energy could still be conserved.

The Second Law indicates that thermodynamic processes, i.e., processes that involve the transfer or conversion of warmth energy, are irreversible because all of them lead to a rise in entropy. Entropy measures what quantity thermal energy or heat per temperature.

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Answer: because acid and water react in a vigorous exothermic reaction, releasing heat, sometimes boiling the liquid.

The independent variable is the type of liquid and the dependent variable growth of the plants.

An experiment is used to establish the relationship between causes and effect in each of the following cases, let us determine the dependent and independent variable.

1) The independent variable is the type of liquid and the dependent variable growth of the plants. The constants are the plants and the land. A valid hypothesis is; "The growth of the plants depends on the type of liquid used to water the plants"

2) The independent variable is the mode of transport and the dependent variable is the time taken to reach the market. The constant is the distance covered. A valid hypothesis is; "The time taken to arrive at the grocery store depends on the mode of transport used"

3) The independent variable is the kind of app and the dependent variable is the  battery life. The constant is the phone used while the hypothesis is; "Certain apps delete the battery faster than others"

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It is a good idea to put input values and output values into separate sheets when solving a complex problem if it improves readability and usability. this statement is false.

The definition of a problem is something that needs to be resolved or an unpleasant or undesirable condition that needs to be corrected. An example problem is an algebraic equation. An example problem is when it's raining and you don't have an umbrella.

The most common meaning is a diplomatic alternative to "problem". The word "problem" can be too negative, especially in the world of politics and business. It focuses on the bad side of things and suggests that someone made a mistake. The main difference between a task and a problem is that a task is a difficult task that a person wishes to complete, whereas a problem is difficult to manage, understand, and impedes an individual's progress.

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One type of chemical reaction is combustion. Carbon dioxide is produced when carbon combines with oxygen in the combustion of charcoal, for example. Carbon and oxygen are reactants, or the chemicals that initiate a chemical reaction. The process produces carbon dioxide. However, this change is just physical.

As the constituent molecules' composition remains unchanged: 11.19% hydrogen and 88.81% oxygen by mass. Physical change can be classed as either reversible or irreversible. When we burn coal, a chemical reaction occurs, and new substances such as carbon dioxide and water are formed. Burning coal is considered as a chemical change since it results in the production of new compounds.

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Mass of nitrogen in the second sample = 70 g.

Simply said, (14.01 + 14.01) = 28.02 amu is the mass of the nitrogen molecule, or N2. This is referred to as the molecular mass, which is just the total atomic masses of all the atoms that make up a certain molecule.

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One molecule of nabh4 will reduce only two molecules of m-acetylbenzaldehyde to form the corresponding product because there are only two functional groups that can react with NaBH4, namely the ketone and the aldehyde, but NaBH4 had four H present to protonate the molecule.

What is protonation?

An atom, molecule, or ion can be protonated by adding a proton to it. The difference between protonation and hydrogenation is that during protonation, the protonated species' charge changes, whereas it remains unchanged during hydrogenation. Numerous catalytic processes result in protonation.

A conjugate acid is created when a proton (or hydron, or hydrogen cation), (H+), is added to an atom, molecule, or ion. Deprotonation is the analogous process that occurs when a proton is taken out of a Bronsted-Lowry acid.

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Answer:

27.2 kg

Explanation:

13.6 * 2 L of commercial flask of mercury = 27.2 kg.

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The electrons in the atom's third energy level that are involved in chemical reaction are six in number.

Sulfur is an element that can be found in group sixteen of the periodic table. It has a valency of two because it has six electrons in the outermost shell and shares two more electrons with another element in order to form a covalent bond.

There are three electron shells that could be found in sulfur. The first shell has two electrons, the second shell has eight electrons while the last shell has six electrons.

As such, the electrons in the atom's third energy level that are involved in chemical reaction are six in number.

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The given number is can be written in standard form as 1 times 10 to power negative 10 ( 1 x 10⁻¹⁰).

A standard form is a form of writing a given mathematical concept like an equation, number, or an expression in a form that follows certain rules.

The given number =  1.0 x 10^-10

The given figures can be written in standard form as follows;

1.0 x 10^-10 = 1 x 10⁻¹⁰

Thus, the given number is can be written in standard form as 1 times 10 to power negative 10 ( 1 x 10⁻¹⁰).

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