Arrange the atoms according to both decreasing atomic radius and increasing first ionization energy (IE).

a. Ca
b. Na
c. I
d. Br

Answer:

A

Explanation:

this should be obvious if you read it haha

The point at which the reaction is observed to be complete, i.e. the indicator changes color is called end point. The term “end point” refers to the point at which the titration reaction is deemed to have concluded. It is the point at which a titration reaction has been neutralized completely.

At this point, the reaction's equivalence point is reached, and no more titrant is needed to complete the reaction. Titration is a technique used in analytical chemistry to quantify the concentration of a known reactant (the titrant) in a given sample. A known volume of a titrant solution of known concentration is added to the sample until the reaction is complete, at which point the endpoint is reached.The endpoint is determined by adding an indicator to the sample, which changes color when the titration is complete. As a result, it's simple to keep track of when the reaction has finished.The endpoint in a titration is usually identified by observing a colour change. Indicators are utilized to determine the endpoint in most titrations, which is when the color change occurs. The end point is defined as the point at which the indicator changes color, indicating that the titration has been completed.

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When the wavelength increases, wave frequency decreases so if the if the wavelength is increased to 10m then the frequency will be decrease at the same rate.

Frequency and wavelength have inverse relationship to each other. The wave with the greatest frequency has the shortest wavelength. If the frequency increases twice it means one-half the wavelength so we can conclude that if the wavelength is increased to 10m then the frequency will be decrease at the same rate.

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Answer:

Solid < Liquid < gas

Explanation:

Matter consists of molecules, atoms and ions which are held together by forces of cohesion.

The states of matter are solid, liquid and gas.

Solids have molecules, atoms and ions that are tightly packed hence cannot move freely within the structure of the solid particle. This results in low kinetic energy

Liquids have molecules, atoms and ions that are freely packed together compared to solids hence are able to move freely within the structure of the liquid substance to a some extent. This results in a higher kinetic energy compared to that of the solid particle.

Gases have molecules, atoms and ions that are very loosely packed compared to the liquid substance and can move freely within the body of its container. This results in very kinetic energy and increased random motion

Answer:

Solid, Liquid, Gas in that order

Explanation:

On the periodic table, argon has an average atomic weight of 39.948 amu. This number is really near 40. This suggests that Ar-40 is the isotope of argon (Ar) that is most prevalent in the natural world.

If all three argon atoms are neutral, they would each contain 18 protons and 18 electrons. In comparison to one another, the three isotopes will each have a distinct number of neutrons (18, 20, and 22 neutrons respectively).

Atomic number, not atomic mass, is used to categorise the elements. As the atomic number of argon (18) is less than that of potassium (19)

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Given:

Sum of masses of two isotopes = 371.9087 u

Re-185 natural abudance = 37.40%

Re-187 natural abudance = 62.60%

Known:

atomic weight of Re = 186.207 u

Atomic mass of Re-185:

To find the atomic mass of Re-185, take the total mass given and subtract atomic weight.

abundance of Re-185 = 37.40% = 0.3740

(371.9087 - x) = atomic weight of Re-187 in u

To find mass of Re-187:

abundance of Re-187 = 62.60% = 0.6260

Solution:

Step 1. Multiply x times the abundance of Re-185 and multiply (371.9087 - x) times the abundance of Re-187.

Re-185: (0.3740)(x) = 0.3740x

Re-187: (0.6260)(371.9087 - x) = 232.8148462 - 0.6260x

Step 2. Add the results and set them equal to 186.207.

0.3740x + 232.8148462 - 0.6260x = 186.207

Step 3. Solve for x by subtracting 232.8148462 from both sides and then divide both sides by -0.2520.

0.3740x + 232.8148462 - 0.6260x - 232.8148462 = 186.207 -

232.8148462

0.3740x - 0.6260x = -46.6078462

-0.2520x = -46.6078462

-0.2520x/-0.2520x = -46.6078462/-0.2520

x = 184.9517706 u

Step 4. Atomic weights of Re-185 and Re-187.

x = 185.0 u = the atomic weight of Re-185

(371.9087 - 184.9517706) = 186.9569294 = 187.0 u = the atomic weight of Re-187

Therefore the atomic weight of Re-185 is 185.0 u, and the atomic weight of Re-187 is 187.0 u.

Daniel's field of study is related to science and Sanyas field of study is related to chemistry.

Chemistry is the scientific discipline that studies the composition, properties, structure, behavior, and changes of matter. It explores the interactions and transformations of substances at the atomic and molecular levels. Chemistry encompasses a broad range of topics, including the properties of elements and compounds, the formation and breaking of chemical bonds, the identification and characterization of substances, the study of chemical reactions and their mechanisms, and the understanding of the principles governing chemical processes.

Chemists use various experimental and theoretical approaches to investigate and explain the behavior of matter. They employ techniques such as spectroscopy, chromatography, and chemical synthesis to analyze and manipulate substances. Chemistry plays a fundamental role in many scientific fields and has applications in diverse areas, including medicine, materials science, environmental science, energy production, and pharmaceutical development.

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Answer:

It has direction and size.

Explanation:

All physical quantities are generally grouped into two;

i) Vector quantities

ii) Scalar quantities

Vector quantities are those quantities that has both magnitude (size) and direction.

Scalar quantities are those quantities that has magnitude (size) and no direction.

Velocity is a vector quantity because it has direction and size.

1. The enthalpy of reactant is 80 KJ

2. The enthalpy of product is 160 KJ

3. The activaition energy for the reaction is 160 KJ

4. The heat of reaction is 80 KJ

5. The forward reaction is endothermic

6. The addition of catalyst will lower the activation energy

7. The enthalpy of reactant is less than the enthalpy of product

8. False

9. False

10. False

The enthalpy of reactants defines the energy of the reactants while the enthalpy of products defines the energy of product.

From the diagram given, we obtained the following

The activation energy for the reaction can be obtain as follow:

Activation energy = Peak energy - Energy of reactant

Activation energy = 240 - 80

Activation energy = 160 KJ

The heat of reaction can be obtain as follow:

Heat of reaction = Enthalpy of products - Enthalpy of reactants

Heat of reaction = 160 - 80

Heat of reaction = 80 KJ

The heat of reaction obtained above is positive (i.e 80 KJ).

Thus, we can conclude that the forward reaction is endothermic reaction.

A catalyst is a substance which alters the rate of a reaction. Catalyst tends to lower the activation energy of a reaction, thereby enhacing the reaction rate.

However, we must take note of the following:

From the diagram above, we obtain:

We can see that the enthalpy of the reactant is less than that of the products.

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A balanced ionic equation shows the specie that is present in the reaction.

A balanced ionic equation shows the specie that is present in the reaction. The ions that undergo change appear in the final ionic equation. Let us now write the ionic equation for each reaction.

In the case of reaction 1;

H^+(aq) + Cl^-(aq) + Li^+(aq) + OH^-(aq) ---->H2O(l) + Li^+(aq) + Cl^-(aq)

Reaction 2;

Ca^2+(aq) + 2Cl^-(aq) + Ba^2+(aq) + S^2-(aq) -----> BaS(s) + Ca^2+(aq) + 2Cl^-(aq)v

Reaction 3;

Na^+(aq) + NO3^-(aq) + H^+(aq) + OH^-(aq) ---->H2O(l) + Na^+(aq) + NO3^-(aq)

Reaction 4;

6Na^+(aq)  + 6Cl^-(aq) + 3Zn^2+ + 2PO4^3-(aq) -----> Zn3(PO4)2(s) + 6Na^+(aq)  + 6Cl^-(aq)

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It causes freezing point depression which requires the gasoline to reach a much lower temperature before freezing. Hence, option C is correct.

Whenever a solute is added to a solution/solvent, it leads to depression in the freezing point of that solution/solvent. Depression in the freezing point of a solution on the addition of a solute is a colligative property.

A colligative property is a physical property which depends upon the number of solutes added not on the nature of solutes which means it does not matter whether we are adding 1000 particles of sugar or salt in water, the depression in the freezing point will occur by the same °C. Also, the more a solute is added the more will be the depression at the freezing point.

The formula for depression at the freezing point is mentioned as under:

             Δ T = K x m

where Δ T = freezing point depression;

                 K = cryoscopic constant;

                 m = molality of the solution.

For example, The freezing point of water is 0 °C but as soon as we add a 92 gm solute like NaCl (common salt) in 1000 gm of water, its freezing point will be lower to −3.72 °C.

Hence, option C is correct.

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Answer:

they require more testing in real-word conditions

Explanation:

One of the biggest reasons for this very slow uptake of hydrogen vehicles is the existing infrastructure. ... The sceptics' first argument against hydrogen vehicles is that they're less efficient than EVs are. Because hydrogen doesn't occur naturally, it has to be extracted, then compressed in fuel tanks.

From the plot of the volume of a sample gas versus temperature at three different pressures it is clear that all the statements given are correct.

Temperature is defined as how hot or cold something is can be which is expressed numerically using the units of temperature.

A device that is used to determine temperature is known as thermometer.

The most widely used scales for measuring temperatures are the Kelvin scale (K), which is mostly used in science, the Fahrenheit scale (°F), and the Celsius scale, also referred to as centigrade and denoted by the unit symbol °C.

Absolute zero is the temperature  at which a gas could hypothetically have zero volume.

All of the lines usually intersect at -273.15°C when they are extrapolated to V = 0.

All of the lines intersect at the same temperature when V = 0 is extrapolated.

Hence, all the above statements are correct.

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If you're talking about organic and inorganic compounds, they are all classified under one.

However, if you're talking about ionic and covalent compounds, they can be classified under them.

Carbon dioxide: Covalent

I believe you're talking about ChL, which could be considered a chemical compound or covalent.

NaCi does not exist. However, if you're talking about NaCl, which DOES exist, it is ionic.

Ci does not exist, but if it's Cl, once again, covalent.

Henceforth, I have no context. ChL OR NaCl could be considered the answer.

Why ChL? Chemical.

Why NaCl? It is the odd one out and ionic bonds are often considered a compound different from others.

Answer:

protons=11

electrons=11

neutrons=12

The pH of a solution if 10 ml of a 1 M HCl solution is added to 10 ml of a 1 M NaOH solution can be calculated as follows:

First, let's find the number of moles of HCl and NaOH in the solution. Number of moles of HCl = Concentration of HCl x Volume of HClNumber of moles of HCl = 1 M x (10 ml/1000 ml)Number of moles of HCl = 0.01 molesNumber of moles of NaOH = Concentration of NaOH x Volume of NaOHNumber of moles of NaOH = 1 M x (10 ml/1000 ml)Number of moles of NaOH = 0.01 molesNext, let's find the net number of moles of H+ and OH- ions.Number of moles of H+ ions = Number of moles of NaOH - Number of moles of HCl.Number of moles of H+ ions = 0.01 - 0.01Number of moles of H+ ions = 0 molesNumber of moles of OH- ions = Number of moles of HCl - Number of moles of NaOHNumber of moles of OH- ions = 0.01 - 0.01Number of moles of OH- ions = 0 molesSince the net number of moles of H+ ions and OH- ions is zero, the solution is neutral. The pH of a neutral solution is 7. Therefore, the pH of the solution is 7.

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Answer:

Number of electrons

Explanation:

An atom is made up of three fundamental subatomic particles called protons, neutrons and electrons.

Protons are the positively charged particles in an atom.

Neutrons do not carry any charges

Electrons are negatively charged.

 Both protons and neutrons occupy the tiny nucleus. The extra-nuclear space is filled with electrons.

Answer:

B) Covalent, because electrons are shared.

Two atoms with an electronegativity difference of 0.4 form a bond that is covalent bond because electrons are shared.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

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Answer:

it turns into icecream

Answer:

Physical dependence is characterized by tolerance and withdrawal. Drug or substance dependency is psychological.

Yes, in qualitative anion analysis, there is a specific order that is commonly followed to systematically identify and separate different anions present in a given sample.

Yes, in qualitative anion analysis, there is a specific order that is commonly followed to systematically identify and separate different anions present in a given sample. This order is known as the systematic scheme or the systematic qualitative analysis.

The systematic scheme generally begins with the preliminary tests to determine the presence of certain groups of anions based on their characteristic reactions. These preliminary tests help in narrowing down the possibilities and guide the subsequent steps.

Following the preliminary tests, the anions are typically separated into groups based on their behavior in specific reagents or precipitating agents. Each group of anions is then subjected to specific confirmatory tests to identify the presence of particular anions within that group. The separation and identification process continues with subsequent groups until all relevant anions have been identified or excluded.

The specific order of the systematic scheme may vary slightly depending on the analytical method or the specific laboratory protocols being followed, but the overall goal remains the same: to systematically identify and separate anions in a logical and efficient manner.

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Answer:

C6H12

Explanation:

Molar mass of C =12.0 H=1.0

12x + 2(1x) = 84

x = 6

so it should be C6H12

The molecular formula of the compound will be C₇H₁₄.

The empirical formula of the compound gives the simplest ratio of the number of different elements present in a compound. The molecular formula of the compound provides the actual number of each element present in a compound. This formula is generally used and can be determined as a multiple of the empirical formula of a compound.

The empirical formula offers the ratio of the number of each atom in a given compound. The composition of a compound is directly determined by its empirical formula.

Given, the empirical formula of the compound is  CH₂.

The empirical formula mass of the compound = 12 + 2 = 14 g

The molar mass of the compound = 84 g

The multiple will be = 84/12 = 7

The molecular formula of the compound = (CH₂)₇ = C₇H₁₄

Therefore, the molecular formula of the compound is C₇H₁₄.

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Valentina will need to modify the air mass model by spreading out the air molecules, reducing the density of the air mass, adding cloud symbols and water droplets, and adding arrows to show wind direction and speed.

When an air mass comes into contact with a warm front, several changes occur in the air mass. Valentina will need to modify the model to reflect these changes.

First, as the air mass moves towards the warm front, it will encounter warmer air. This will cause the air molecules in the air mass to speed up and spread out. Valentina can represent this by spreading out the dots that represent the air molecules in the air mass.

Second, as the air molecules spread out, the density of the air mass will decrease. Valentina can represent this by reducing the number of dots in the air mass model.

Third, as the air mass rises over the warm front, it will cool down due to the lower atmospheric pressure. This can cause water vapor in the air mass to condense, forming clouds. Valentina can add cloud symbols to the model to represent this change.

Fourth, the warm front will also bring moisture into the air mass. Valentina can represent this by adding water droplets to the air mass model.

Fifth, as the warm front moves in, it will cause changes in wind direction and speed. Valentina can add arrows to the model to show the direction and speed of the wind.

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Answer:

2.53•10^23 atoms

Explanation:

23 is the exponent btw

The change in free energy of a chemical reaction represents the amount of energy that is available to do useful work. It is a thermodynamic quantity that indicates the direction and extent of a chemical reaction.

If the free energy change (ΔG) is negative, the reaction is exergonic, meaning that energy is released and the reaction is spontaneous. This indicates that the products are more stable than the reactants, and the reaction will proceed in the forward direction. Conversely, if the free energy change (ΔG) is positive, the reaction is endergonic, meaning that energy is required for the reaction to occur and it is non-spontaneous. This indicates that the reactants are more stable than the products, and the reaction will proceed in the reverse direction. If the free energy change (ΔG) is zero, the reaction is at equilibrium, meaning that the forward and reverse reactions are occurring at equal rates and the concentrations of reactants and products do not change over time.

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River samples may evidence problems with the water treatment plant because it may contain an excessive amount of certain substances which are filtered during this procedure.

A water treatment plant is a place where wastewater from a city is processed and purified in order to obtain potable water.

Water treatment procedure generally involves the collection, chemical substance addition, filtration, and disinfection.

Any type of problem in these steps can be evidenced by taking a sample of the water after treatment.

In conclusion, river samples evidence problems due to an excessive amount of certain substances which are filtered during this procedure.

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The atomic number represents the number of protons, whereas the mass number represents the quantity of protons and neutrons. The number of protons equals the amount of electrons.

The atomic number is the number of protons. The number of neutrons may be calculated by subtracting the number of protons from the atomic mass, which is then rounded to the closest whole number.

For neutrally charged species, the number of electrons in an atom equals the atomic number of an element. This signifies that the number of electrons and protons in an element are equal. As a result, the number of electrons in oxygen is eight.

The number of valence electrons in neutral atoms equals the atom's main group number. A periodic table column can be used to determine an element's main group number. Carbon, for example, belongs to group 4 and contains four valence electrons.

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