MULTIPLE CHOICE QUESTION
Which of the following is an example of a
chemical change?
An iron nail forming rust
Tearing paper into many little pieces
Steam coming out from boiling water
Mixing sand with sugar
Dissolving coffee powder in hot water

Answer:

2 M

Explanation:

molarity = (moles of solute)/(liters of solution)

molarity = 10/5 = 2 M

The net ionic equation for the reaction between aqueous solutions of potassium hypochlorite and nitric acid is NO₃⁻ + K⁺ → KNO₃.

The net ionic equation is a chemical equation that determines which ions are involved in the final product's creation.

Chemical reaction will be represented as:

HNO₃(aq) + KClO(aq) → KNO₃(s) + HClO(aq)

Ionic equation for the above reaction will be represented as:

H⁺ + NO₃⁻ + K⁺ + ClO⁻ → KNO₃ + H⁺ + ClO⁻

In the above equation H⁺ and ClO⁻ are the spectator ions, so the net ionic equation of the given chemical reaction is:

NO₃⁻ + K⁺ → KNO₃

Hence net ionic equation for the given reaction is NO₃⁻ + K⁺ → KNO₃.

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KOH+NaCl⇒NaOH+KCl

there is no net ionic equation because all compounds dissolves

The product of the electron transport chain that reenters the krebs cycle is NAD. Details about electron transport chain can be found below.

Cellular respiration is the process by which living organisms break down food molecules in their cells.

The process of cellular respiration involves the following stages:

The electron transport chain is a series of reactions that involve the transfer of electrons from one molecule to another. NAD+ is one of the electron acceptor and products of the ETC that reenters the kreb cycle.

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Answer:

A peer-reviewed study by university researchers.

Explanation:

The manufacturer of the car might be interested in making the car look more efficient than it is.

When more products or reactants are added to a reaction that is in equilibrium, the equilibrium will shift so as to annul the effects of adding the products/reactants.

It states that when a reaction is in equilibrium and one of the constraints that affect the rates of chemical reactions is applied, the equilibrium will shift accordingly so as to annul the effects of the added constraint.

Thus, if more products are added, the equilibrium will shift to produce more reactants. If more reactants are added, the equilibrium will shift to produce more products.

Hence, what will happen to the equilibrium position depends on whether CHO2– is a reactant or product.

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A balanced equation contains the same number of atoms of the element on both sides of the equation. The statement is true.

A balanced equation is the representation of the molecules or the compound of the reactants on the left and the product on the right side of the reaction equation with their stoichiometry coefficients and symbols.

The number of the atoms of the molecules on the reactant side and the product side of the same element must be equal so, that the law of the conservation of mass is justified.

Therefore, the statement is true.

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Mole fraction is the ratio of the constituent moles to the total constituents. The mole fraction of sodium chloride is 0.0443.

A mole fraction is the proportion of the moles of the component in a total component present.

In 100 gm of solution 13.0 5 means, there is 13.0 gm of sodium chloride present. The mass of water is calculated as,

100 - 13.0 = 87.0 gm

Moles of sodium chloride is calculated as:

[tex]\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass} \\\\&= \dfrac{13}{58}\\\\&= 0.224 \;\rm moles\end{aligned}[/tex]

Moles of water are calculated as:

[tex]\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass} \\\\&= \dfrac{87}{18}\\\\&= 4.83\;\rm moles\end{aligned}[/tex]

Now, moles fraction is calculated by dividing moles of sodium chloride by total moles as,

[tex]\begin{aligned} \text{Mole fraction of NaCl} &= \dfrac{0.224}{0.224 + 4.83}\\\\&= 0.0443\end{aligned}[/tex]

Therefore, the mole fraction of sodium chloride is 0.0443.

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Answer: You should learn the symbols for the eight most abundant elements in the Earth's crust (Oxygen (O), Silicon (Si), Aluminum (Al), Calcium (Ca), Iron (Fe), Magnesium (Mg), Sodium (Na), and Potassium (K) .

Explanation:

the 2nd one is correct

The option that would most likely increase the rate for a more contentrated potassium hydrogene

:) hope this helps

using a more concentrated potassium hydroxide solution
Concentration is one of the factors that affect the rate of reaction

The higher the concentration, the higher the reaction rate

Answer:

True

Explanation:

When determining rate law, the coefficients in the balanced equation are used to determine how different concentrations affect the rate.

A change to any gas in the atmosphere affects energy absorbed by the surface in the same way of green house effect.

Green house effect is a phenomena in which energy from the sun comes to the earth and the gases which are present in the atmosphere of the earth absorbs the energy from the sun and raises earths temperature.

The gases which are especially responsible for this effect are carbon dioxide, methane, nitrous oxide, ozone and vapors of water. Change in the concentration of this gases will affect the energy absorbed by the surface.

Hence, this is same like green house effect.

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Answer:

primary, secondary and tertiary water treatment.

Explanation:

If the self ionization reaction is endothermic then it will shift on right side from equilibrium if we increase the temperature.

Endothermic reactions are those reactions in which heat or energy is absorbed by the reactants for the formation of product.

If the self ionization reaction is endothermic in nature then in this condition at the equilibrium if we increases the temperature then the formation of ions increases as a result of the shift of the reaction towards the right side.

Hence, by increasing the temperature we can predict whether the reaction is endothermic or not.

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Answer: lodine solution and vinegar are both soluble

Solution is the mixture of solute and solvent. Iodine solution and vinegar solution both are soluble. Iodine and vinegar are the homogenous mixture.

A solution is a homogeneous mixture of o solutes  and solvent. Solvent is the material in which a solute dissolves to produce a homogeneous mixture. Solute is the material that dissolves in a solvent to produce a homogeneous mixture in phase

Common examples of solution are sugar in water and salt in water solutions, soda water etc. In a solution, all the components that are present as a single phase. Iodine and vinegar both molecule shows homogenous mixture.

Hence, the iodine solution and vinegar solutions are soluble, both compounds are homogenous mixture. Both are totally soluble.

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Assuming that both cases describe hydrogen‑like atoms with one electron, More energy is emitted or absorbed for case 2. The correct option is D.

The energy of the electron decreases as it changes levels, and emission of photons happens in the atom.

With the electron moving from a higher to a lower energy level, the photon is emitted. The photon's energy is the same as the energy lost by an electron moving to a lower energy level.

Thus, the correct option is D, More energy is emitted or absorbed for case 2.

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Answer:

1 H2SO4+ 1 MgCl2 = 1 MgSO4+ 2HCl

The half-reaction includes either the reduction or the oxidation reaction of the redox reactions. In acidic solution permanganate ion will react with hydrogen ion to yield manganese ion and water.

Redox or oxidation-reduction reactions are the chemical reactions in which the oxidation and the reduction of the chemical species occur simultaneously.

Permanganate (VII) ion is a strong oxidizing agent and gets easily reduced to manganese ion in presence of the hydrogen ion in an acidic solution.

The balanced half-reaction for reduction is shown as,

[tex]\rm MnO_{4}^{-} \; (aq)+ 8H^{+} \; (aq)+ 5e^{-} \rightarrow Mn^{2+} \; (aq)+ 4H_{2}O \; (l)[/tex]

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Answer:

Conduction, Convection, and Radiation .......

Answer:

Below:

Explanation:

a)2 Na + F2 = 2 NaF

It's already balanced.

Type is synthesis.

b)H2 + I2 = 2 HI

It's balanced now.

Type's synthesis.

Option A

On products side

On reactants side

Hence balanced

Answer:

41.25

Explanation:

I am not sure if your teacher expects you to just find specific heat yourself, but if they do answer it using as below:

Quick search shows aluminium specific heat is 0.90 J/gC.

use formula: q = mcΔT (q = heat, m= mass, c= specific heat, ΔT is temperature change)

q = mcΔT

q/(mc) = ΔT

32.3/(0.87 x 0.90) = ΔT

ΔT = 41.25 C

A laboratory report is an important part of the scientific process that communicate the important work that has been done.

Your information is incomplete. Therefore, an overview of a laboratory report will be given. The laboratory report is important for future studies a d experiments.

A laboratory report is broken down intosections such as title, abstract, introduction, methods, materials, results, discussion conclusion, and references.

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What causes deep, cold currents to form in the oceans near the poles? The sinking of dense, cold water paired with high salinity.

Hydrogen is the element with atomic number one. The representation of the hydrogen molecule with a double bond is incorrect.

A double bond is a type of chemical bond that involves two pairs or four bonding electrons of the atom in a molecule. They are stronger and shorter bonds compared to single bonds.

A hydrogen molecule can never have a double bond in its molecule as it has only a single electron in its shell and cannot form a double bond due to the lack of four electrons.

Therefore, hydrogen molecules cannot form a double bond.

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In a neutral atom, the number of electrons equal to the number of protons

Answer:

1 sigma bond and 2 pi bonds

Explanation:

A triple bond is made up of 1 sigma bond and 2 pi bonds.

Given example is that of ethyne

Answer:

1 [tex]\sigma[/tex] and 2π bonds

Explanation:

Always remember that

The general example is

N=N bond

Answer:

neutral   acidic   basic      basic

Explanation:

>7 = acid    7  neutral      >7  basic