what are the chemicals used to preserve food and give it color and flavor​

Answer:

it is important to be both accurate and precise. Accuracy represents how close a measurement comes to its true value. This is important because bad equipment, poor data processing or human error can lead to inaccurate results that are not very close to the truth.

Explanation:

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Answer:

Waves carry energy from one place to another.

Because waves carry energy,some waves are used for communication,eg radio and television waves and mobile telephone signals.

Explanation:

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that's my answer

correct me if im wrong

Answer:

Particles are constatantly moving and diffusing

This is possible because of diffusion

Explanation:

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Answer:

Zinc metals was oxidized ,zinc ions were reduced

Explanation:

The zinc atoms lose electrons and becomes oxidized . And zinc ions gain electrons (becomes reduced)

The redox reaction taking place here, is the zinc metal is oxidized and zinc ions are reduced further by accepting electrons. Hence, option a is correct.

In a redox reaction, one reactant species is oxidized and another one is reduced. Oxidation is the process of loss of one or more electrons to form its higher oxidation state.

Reduction is the process of gaining electrons forming its lower oxidation state. The species which undergoes oxidation is called oxidant and the one reduced is called reductant.

Zn metal have higher negative electrode potential and undergoes oxidation by losing two electrons to form the Zn²⁺ ions. Thus the Zn metal is oxidized.  The Zn²⁺ ions further undergoes reduction to form the metal by gaining electrons.

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Answer:

Does lithium oxide react with hydrochloric acid?

Explanation:

Lithium Hydroxide reacts with acids to produce a Lithium salt: Hydrochloric Acid + Lithium Hydroxide → Lithium Chloride + Water. HCl + LiOH → LiCl + H2O. ... H2SO4 + 2LiOH → Li2SO4 + 2H2O

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Answer:

0,5019 m

Explanation:

Expansividad lineal = aumento de longitud / longitud original × aumento de temperatura

Expansividad lineal = 19x 10-6 ° C-1

Aumento de temperatura = 50 ° C - 30 ° C-1 = 20 ° C

Longitud original = 0,5 m

Sustitución de valores;

aumento de longitud = 19 x 10-6 ° C-1 × 20 ° C × 0,5 m

Aumento de longitud = 0,0019 m

Nueva longitud = aumento de la longitud + longitud original

Nueva longitud = 0,5 m + 0,0019 m

Nueva longitud = 0,5019 m

Answer: The statement it is a weak acid is true for the substance.

Explanation:

An acid that dissociates completely when dissolved in water to give hydrogen [tex](H^{+})[/tex] or hydronium [tex](H_{3}O^{+})[/tex] ions is called a strong acid.

For example, HCl is a strong acid.

[tex]HCl + H_{2}O \rightarrow H_{3}O^{+} + Cl^{-}[/tex]

An acid that dissociates partially or weakly when dissolved in water to given hydrogen or hydronium ions is called a weak acid.

For example, [tex]CH_{3}COOH[/tex] is a weak acid.

[tex]CH_{3}COOH \rightleftharpoons CH_{3}COO^{-} + H_{3}O^{+}[/tex]

A strong base is a base which when dissolved in water then it dissociates completely to give hydroxide ions.

For example, NaOH is a strong acid.

A weak base is a base which when dissolved in water then it dissociates partially or weakly to give hydroxide ions.

For example, [tex]NH_{3}[/tex] is a weak base.

Hence, in an aqueous solution where 42% of a substance dissociates to release hydronium ions shows that the dissociation is less than 50%. This means that substance is dissociating weakly so, it is a weak acid.

Thus, we can conclude that the statement it is a weak acid is true for the substance.

Answer:

It is a weak acid.

Explanation:

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Answer:

The intermolecular forces between paraffin molecules are entirely due to dispersion forces, and are therefore size dependent.

Explanation:

Answer: The intermolecular forces between paraffin molecules are entirely due to dispersion forces, and are therefore size dependent.

Explanation:

The intermolecular forces between paraffin molecules are entirely due to dispersion forces, and are therefore size dependent. 103 Paraffin wax is soluble in: a) water; b) hexane; c) acetone; d) ethanol Is shopping bag (polyethylene)

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Answer:

The Coriolis effect is caused by the rotation of the earth around its own axis.

Explanation:

The Coriolis effect arises from the fact that different latitudes of the earth's surface rotate at different speeds. The path of wind on earth is deflected by the Coriolis effect. As things move over the earth, they meet different speed areas, which causes the Coriolis Effect to divert their route.

Thus, The Coriolis effect is caused by the rotation of the earth around its own axis.

Answer:

Kₑq = [H₂]² [O₂] / [H₂O]²

Explanation:

We'll begin by defining equilibrium constant for a reaction. This is given below:

The equilibrium constant for a given reaction is defined as the ratio of the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient.

With the above information in mind, we shall determine the equilibrium constant for the reaction given in the question above. This is illustrated below:

2H₂O (g) <=> 2H₂ (g) + O₂ (g)

Kₑq = [H₂]² [O₂] / [H₂O]²

Answer:

TRUE

Explanation:

Main job of calorimeter is to measure energy changes or determine specific heat capacity of different substances. Specific heat is an intensive property (like density, color, etc.) that does not depend on the amount of a substance present. This allows substances to be identified using their specific heat. Thus, calorimeter comes very handy in determining the specfic heat of unknown substance.

Answer:

C (0 K ) is the coldest possible temperature.

Answer:

Gamma rays—3 and radio waves—2

Explanation:

hard time seeing question, but i believe it is Gamma rays—3 and radio waves—2

Answer:

B Reaction happens in both directions.

Answer:

B. Reaction happens in both directions!

Explanation:

Dynamic equilibrium is reached once a reaction becomes reversible -- meaning that, when a reaction is in dynamic equilibrium, the forward reaction rate and the backward reaction rate, are equal or occurring at the same time!

Equilibrium is really just like saying they're [the reactions] at a point where they're both "balanced" and so they're equal, nothing is changing and they're going equally both ways!  (This is just for explanatory reasons, but "balanced" isn't the correct term to use for dynamic equilibrium, as it is used for other things in Chemistry!)

Hope this helps a little! [And that I didn't confuse you!] :)

Answer:

Vaporization

Since the question does not specify what molecule is being acted upon by the increment in temperature, I'll assume it's water.

When first taken out of the fridge, water is in the form of ice, and it has not been affected by a change in temperature yet, so it's at the origin.

(origin = ice)

As you raise the temperature, however, the ice starts to melt, and melting occur during phase 2. You have to keep the temperature constant for the process to properly occur.

(phase 2 = melting)

After it finishes melting, the ice is now in it's liquid state, which is water. The temperature continues to rise in order to proceed to the next phase.

(2nd slope = water)

Lastly, Water is being vaporized during phase 4. Notice, the temperature is kept constant in order to allow the process to properly occur.

(phase 4 = vaporization)

Answer:

Most oxidation-reduction (redox) processes involve the transfer of oxygen atoms, hydrogen atoms, or electrons, with all three processes sharing two important characteristics: (1) they are coupled—i.e., in any oxidation reaction a reciprocal reduction occurs, and (2) they involve a characteristic net chemical change— .

Electrons will be transferred during redox reaction.

The electron is subatomic particles which are placed in surrounding the nucleus. Electrons carry negative charge.

Redox reaction involve the transfer of electrons between intermediates. A redox reaction occurs when the oxidation states of the substrate change. The removal of electrons or even a rise in the oxidation state of such a chemical or its atoms is referred to as oxidation. The acquisition of electrons or a lowering in the oxidation number of a chemical or the atoms inside it is referred to as reduction.

Hence the answer will be electron

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Answer:

0.17325 moles per liter per second

Explanation:

For a first order reaction;

in[A] = in[A]o - kt

Where;

[A]= concentration at time t

[A]o = initial concentration

k= rate constant

t= time taken

ln0.5 =ln1 - 2k

2k = ln1 - ln0.5

k= ln1 - ln0.5/2

k= 0 -(0.693)/2

k= 0.693/2

k= 0.3465 s-1

Rate of reaction = k[A]

Rate = 0.3465 s-1 × 0.50 mol/L

Rate = 0.17325 moles per liter per second

Answer:

2 molL ^ -1

Explanation:

Masa de soluto = 8 g

volumen de solución = 100 mililitros o 0,1 L

Número de moles de solución = masa / masa molar = 8g / 40g / mol = 0,2 moles

concentración = número de moles / volumen

concentración = 0.2 / 0.1

= 2 molL ^ -1

Answer:

In the periodic table element Y is known as Yttrium and the Atomic number is 39. And the group is Transition Metal

Answer:

They grow slowly over time, they are made up of multiple organisms.

Explanation:

One polyp is one individual. A Coral is made up of several polyps. Each polyp is less than 1 centimeters but a coral is made of many polyp so the coral itself cant be 1 centimeters across.

Answer:

I think 100 times greater than the electric force

Explanation:

Because, as it is the greatest, it should be a larger number.

Answer:

c.) more than 100 times greater than the electric force

Explanation:

The awnswer is c :)

Answer:

Nonpolar Covalent Bond

Explanation:

A nonpolar covalent bond is one in which the bonding electrons are evenly distributed between the two atoms.

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Answer:

200 mL of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water.

Explanation:

The solution is the result of the mixture between the solute, which is the substance that dissolves, and the solvent, which is the substance in which a solute dissolves. That is, a solution (or solution) is a mixture of two or more components, perfectly homogeneous since each component is intimately mixed with the other.

The concentration of solutions is the amount of solute contained in a given amount of solvent or solution. A unit of concentration is the percent weight to volume.

The percent weight to volume is the percentage ratio between the weight of the solute and the volume of the solution. It is calculated as:

[tex]Percent =\frac{mass of solute}{volume of solution} *100[/tex]

Mass is measured in grams, while volume is measured in mL.

In this case:

Replacing:

[tex]6=\frac{12 g}{volume of solution} *100[/tex]

Solving:

volume of solution*6= 12 g*100

[tex]volume of solution=\frac{12 g}{6} *100[/tex]

volume of solution= 200 mL

200 mL of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water

Answer:

everything can be found in the picture

Answer:

4.65 moles

Explanation:

1 mole ---> 6.022×10²³ atoms of si

X mole ---> 2.8×10²⁴ atoms of si

X= 2.8×10×10²³/6.022×10²³

=28/6.022

=4.65moles

Explanation:

mass number....................