10 uses of water good answer​

Answer:

Explanation:

An equation showing only what is involved in the reaction.

a o e x

Answer:

Oil prices would decrease, and availability would increase

Explanation:

The statements that are true are the statements that have been marked 1 - 4 in the options. Statement 5 is not true. Options A,B,C,D.

The term thermal energy has to do with the energy that is possessed by a substance whose particles are in motion. This is why we can say that the thermal energy does derive from the total kinetic energy of the molecules that are present in a substance.

It then follows that when we hit the object up, there is an increase in the total kinetic energy of the molecules as well as an increase in thermal energy of the substance. The cold substances also has thermal energy as long as its molecules are still in motion.

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Answer:

reflection is correct answer by my views

Fire. It's all fun and games until someone ignores the Bunsen burner! ...

Heat Burns. Handling hot items hastily without the proper tools can result in serious burns. ...

Chemical Burns. ...

Cuts and Scrapes. ...

Contamination. ...

Inhalation. ...

Spills and Breaks.

Answer:

B. X represents phosphorus

Explanation:

In an isotope symbol, you write the mass number above the atomic number. So the 31 represents the mass of the protons and neutrons of the element added together, and the 15 represents the atomic number or the total number of protons in the nucleus.

Answer:

2-Methyl-5-nitrothiophene  

Explanation:

The 2- and 5-positions of thiophene are the most susceptible to electrophilic aromatic substitution.

Thus, the major product from the reaction of 2-methylthiophene with HNO₃ in acetic acid is 2-methyl-5-nitrothiophene.

Answer:

Empirical formula is NH₃

Explanation:

Given data:

Percentage of hydrogen = 82%

Percentage of nitrogen  = 18%

Empirical formula = ?

Solution:

Number of gram atoms of H = 18 / 1.01 = 17.8

Number of gram atoms of N  = 82 / 14  = 5 .9

Atomic ratio:

                  H               :         N

              17.8/5.9        :        5.9/5.9

                  3               :        1

H : N = 3:1

Empirical formula is NH₃

Answer:

36

Explanation:

There are 6 Carbon atoms, 12 Hydrogen atoms, and 18 Oxygen atoms.

Different metals create particular colored flames during in the flame test since each metal has a different arrangement of electrons, which produces specific colors of light when heated. Since the visible flame color is only of the metal alone, the metal may be recognized.

The precise sizes of the potential energy jumps differ from metal to metal.As a result, the flame color of each metal will differ due to its unique spectral line pattern.The movement of a electrons inside the metal ions contained in the compounds results in the hues of the flame.

Because the energy levels of the electrons travelling around the nucleus fluctuate depending on the element, different compounds react to fire to produce distinct colored flames.

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Answer:

Gas

Explanation:

This in turn determines whether the substance exists in the solid, liquid, or gaseous state. Molecules in the solid phase have the least amount of energy,

Based on the percentage mass of magnesium oxide in the sample, the mass of Magnesium oxide in the sample is 0.42 g.

Magnesium is a metallic element with an atomic number of 12.

Magnesium is an important mineral that is used as a supplement s well as in drugs such as milk of magnesia.

Considering the given magnesium supplement:

1.02 g magnesium supplement contains 25.0% Mg by mass.

Magnesium is present in the supplement as magnesium oxide, MgO.

The molar mass of magnesium oxide, MgO = 40.30 g/mol

Molar mass of magnesium = 24.0 g

Percentage mass of Magnesium oxide in the sample = 40.3 / 24 * 25

Percentage mass of Magnesium oxide in the sample = 42%

Mass of Magnesium oxide in the sample = 42 % * 1.02

Mass of Magnesium oxide in the sample = 0.42 g

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Answer:

the answer is

(D) HI

Explanation:

__________________________________

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The balanced chemical equation for the reaction between a metal carbonate MCO₃ and hydrochloric acid (HCl) is MCO₃ + 2HCl → MCl₂ + CO₂ + H₂O.


The reaction between a metal carbonate and hydrochloric acid results in the formation of a metal chloride, carbon dioxide, and water. The balanced equation for this reaction is MCO₃ + 2HCl → MCl₂  + CO₂  + H₂ O, where M represents the metal. The reaction involves the acid-base neutralization of HCl with the metal carbonate, which produces carbon dioxide gas and water.

The metal chloride is also formed as a product. The coefficient of 2 in front of HCl indicates that two moles of HCl are required to react with one mole of metal carbonate. The balanced equation is important in stoichiometry calculations to determine the amount of reactants and products produced in the reaction.

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Step 1

The reaction must be completed and balanced as follows:

C3H8 + 5 O2 => 3 CO2 + 4 H2O

-------------

Step 2

Information provided:

20.0 g of C3H8

10.0 g of O2

----

Information needed:

1 mole of C3H8 = 44.1 g

1 mole of O2 = 32.0 g

(use your periodic table please)

-------------

Step 3

By stoichiometry,

C3H8 + 5 O2 => 3 CO2 + 4 H2O

44.1 g C3H8 ---------- 5 x 32.0 g O2

20.0 g C3H8 ---------- X

X = 20.0 g C3H8 x 5 x 32.0 g O2/44.1 g C3H8

X = 72.6 g O2

For 20.0 g of C3H8, 72.6 g of O2 is needed, but there is only 10.0 g of O2.

Therefore,

Answer:

The limiting reactant = O2

The excess = C3H8

Answer:

Balance The Chemical Equation Cac2 H2o Ca Oh 2 C2h2 Balance the chemical equation CaC 2 + H 2 O → Ca (OH) 2 + C 2 H 2 Calcium carbide react with water to produce calcium hydroxide and acetylene.

Explanation:

CaC2 + H2O > Ca(OH)2 + CH4

Ca + 2 H2O → Ca(OH)2 + H2 - Balanced equation

A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. In this chemical reaction, nitrogen (N2) reacts with hydrogen (H) to produce ammonia (NH3). The reactants are nitrogen and hydrogen, and the product is ammonia

Balanced chemical equation - A chemical equation in which the number of each type of atom is equal on the two sides of the equation. Subscripts - Part of the chemical formulas of the reactants and products that indicate the number of atoms of the preceding element.

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Answer:

Your answer is D. All of the above

Explanation:

They are all the same answers just worded differently.

Answer: The first is that enzymes have an ideal pH range in which they operate most effectively, and any departure from this range may cause a reduction in enzyme activity. The enzyme's shape or conformation may change as a result of a pH shift, which may also have an impact on the enzyme's capacity to bind to substrates and catalyze processes.

Explanation: Because particular pH ranges are necessary for enzyme activity, PH has an impact on enzyme rate. The pH at which an enzyme is most active is known as its ideal pH, and it might vary from one enzyme to another. A change in pH can cause an enzyme's structure to change, making it more difficult for it to connect to the substrate, which will halt or even stop the process. Even extreme pH values have the ability to denature the enzyme, making it inactive.

The pH levels have a significant impact on an enzyme's capacity to operate effectively, which in turn affects how quickly it can catalyze chemical processes.

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The solution's boiling point will be 101.5 C. Freezing point depression = 2 * 1.027 * kg * mol * kg * mol * = 3.82 K. Thus, the solution's fusion point will be 3.8 C.

The vapour pressure drops when a non-volatile solute is dissolved in a solvent. A lower temperature is needed for the solvent to freeze as a result.

Due to the salt in seawater, it freezes at a lower temperature than fresh water—approximately 28.4 degrees Fahrenheit. Yet, because only the water part of seawater freezes, very little salt is present in the ice when it is formed.

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Soaps clean up dirt by acting as emulsifying agents. The nonpolar chain in the soap is attracted to the dirt and the ionic end is attracted to the water. Thus, the soap creates b)dispersed droplets that wash the dirt away with the water.

In the field of chemistry, soap can be described as a washing material that is made by adding a base to a fat or oil.

As it contains fats and oils, soaps work by acting as an emulsifying agent.

The non-polar fats and oil absorb any kind of dirt and kill microorganisms.

When water is added to soap, the mixture acts as a dispersed droplet to absorb dirt particles in it. In this way, any kind of dust, microorganisms and dirt are removed.

The correct question format is:

Soaps clean up dirt by acting as emulsifying agents. The nonpolar chain in the soap is attracted to the dirt and the ionic end is attracted to the water. Thus, the soap creates ............. that wash the dirt away with the water.

a) floating bubbles

b) dispersed droplets

c)solid precipitate

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The correct answer is B. The rate of a catalyzed reaction will be faster if the solid catalyst is finely ground before it is added to the reaction mixture because a greater surface area of catalyst will be exposed. This increased surface area will provide more sites for the reactant molecules to collide with and react on, leading to a higher rate of reaction.

The mass of the catalyst does not directly affect the rate of reaction, but rather the number of available active sites on the surface of the catalyst. Therefore, increasing the surface area of the catalyst by finely grinding it will lead to a higher rate of reaction. It is important to note that the fine catalyst particles must be well dispersed in the reaction mixture to avoid interference with product formation. The rate of a catalyzed reaction will be affected if the solid catalyst is finely ground before it is added to the reaction mixture. The correct option is B. The rate will be faster because a greater surface area of catalyst will be exposed. When a solid catalyst is finely ground, its surface area increases. This allows more of the catalyst to come into contact with the reactants, resulting in more active sites for the reaction to take place. This, in turn, increases the rate of the reaction. It's important to note that the mass of the catalyst remains the same, but the increased molecules surface area is the key factor in enhancing the reaction rate.

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a) In the given set of the atom, the atom which has the smallest ionization energy is Cs and the atom which has the smallest electron affinity is Cs.

Ionization energy is the energy required to remove valence electron from the outermost shell. Ionization energy is going to increase from left to right as electron is added in the same shell and the nuclear charge is increased. The outermost electron is strongly bounded to the nucleus as we goes from left to the right. Hence, Cs has lowest ionization energy, followed by Ba and La.

Electron affinity is defined as the change in potential energy when an atom is added to neutral atom to form negative ion. Electron affinity is increased from left to right in the periodic table as nuclear attraction is increased. Hence, Cs has less electron affinity, followed by Ba and La.

b) In the given set of the atom, the atom which has the smallest ionization energy is Zn and the atom which has the smallest electron affinity is Zn.

Ionization energy is the energy required to remove valence electron from the outermost shell. Ionization energy is going to increase from left to right as electron is added in the same shell and the nuclear charge is increased. The outermost electron is strongly bounded to the nucleus as we goes from left to the right. Hence, Zn has lowest ionization energy, followed by Ga and Ge.

Electron affinity is defined as the change in potential energy when an atom is added to neutral atom to form negative ion. Electron affinity is increased from left to right in the periodic table as nuclear attraction is increased. Hence, Zn has less electron affinity, followed by Ga and Ge.

c) In the given set of the atom, the atom which has the smallest ionization energy is In and the atom which has the smallest electron affinity is In.

When we goes down the group, the ionization energy is decreased because distance between outer electron and nucleus is increased. Hence, it requires less energy to remove valence electron and In requires less energy to remove electron, followed by P and Ar.

Electron affinity also decreases down the group as electron is goes away from the nucleus. Hence, In has smallest electron affinity, followed by P and Ar.

d) In the given set of the atom, the atom which has the smallest ionization energy is Tl and the atom which has the smallest electron affinity is Tl.

When we goes down the group, the ionization energy is decreased because distance between outer electron and nucleus is increased. Hence, it requires less energy to remove valence electron and Tl requires less energy to remove electron, followed by Sn and As.

Electron affinity also decreases down the group as electron is goes away from the nucleus. Hence, Tl has smallest electron affinity, followed by Sn and As.

Therefore, Cs, Zn, In and Tl has smallest ionization energy and electron affinity.

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The most accurate lead test is the XRF Scan. X-ray Fluorescence (XRF) is an analytical technique used to determine the concentrations of elements in a sample.

What is lead test?

Lead test is a type of environmental analysis used to detect the presence of lead in water, soil, dust, and other materials. It is typically used to assess potential health risks associated with lead contamination and to monitor the effectiveness of any lead remediation efforts. Lead testing typically involves collecting samples of the material to be tested, which is then sent to a laboratory for analysis. The laboratory will then use a combination of chemical and physical tests to determine the lead content of the sample.

It works by bombarding a sample with X-rays, which causes the atoms in the sample to emit their own X-rays. These secondary X-rays can then be measured to determine the concentrations of elements in the sample. XRF is considered the most accurate and reliable method for detecting and measuring lead in a variety of materials.

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Answer: meter per second

Explanation: speed = distance / time, in SI units m/s

Answer:

1. 0.125 mole

2. 42.5 g

3. 0.61 mole

Explanation:

1. Determination of the number of mole of NaOH.

Mass of NaOH = 5 g

Molar mass of NaOH = 23 + 16 + 1

= 40 g/mol

Mole of NaOH =?

Mole = mass /molar mass

Mole of NaOH = 5/40

Mole NaOH = 0.125 mole

2. Determination of the mass of NH₃.

Mole of NH₃ = 2.5 moles

Molar mass of NH₃ = 14 + (3×1)

= 14 + 3

= 17 g/mol

Mass of NH₃ =?

Mass = mole × molar mass

Mass of NH₃ = 2.5 × 17

Mass of NH₃ = 42.5 g

3. Determination of the number of mole of Ca(NO₃)₂.

Mass of Ca(NO₃)₂ = 100 g

Molar mass of Ca(NO₃)₂ = 40 + 2[14 + (3×16)]

= 40 + 2[14 + 48]

= 40 + 2[62]

= 40 + 124

= 164 g/mol

Mole of Ca(NO₃)₂ =?

Mole = mass /molar mass

Mole of Ca(NO₃)₂ = 100 / 164

Mole of Ca(NO₃)₂ = 0.61 mole

Answer:

c.hg cannot be cracked for fractional distillation as there is only one of each

Explanation:

Answer:

0.0578647982046175

Explanation: