The change that happen the piece of paper during the burning process?​

Answer:

[tex]Ka=1.11x10^{-3}[/tex]

Explanation:

Hello,

In this case, since the ionization of the given HA acid is:

[tex]HA\rightleftharpoons H^++A^-[/tex]

The equilibrium expression is:

[tex]Ka=\frac{[H^+][A^-]}{[HA]}[/tex]

Whereas the concentration of hydrogen ions is compute from the pH=

[tex][H^+]=10^{-pH}=10^{-2.00}=0.01M[/tex]

Which also equals the concentration of [tex]A^-[/tex] and the in general the ionization extent, therefore, the acid ionization constant, Ka, turns out:

[tex]Ka=\frac{0.01*0.01}{0.1-0.01}\\ \\Ka=1.11x10^{-3}[/tex]

Regards.

Answer:

Malleability is intensive

Length is extensive

Hardness is intensive

Volume is extensive

Explanation:

Extensive properties change when u change the size of an object and intensive properties don’t

Also I just took the quiz

A physical property refer to the properties of an object that can be measured and observed without changing (altering) the chemical composition of the object.  

In Chemistry, there are two (2) main types of physical property and these include:

I. Extensive property: this is a property that changes when the size of an object changes. Some examples of an extensive property are:

II. Intensive property: it is a property that remains the same regardless of the change in the size of an object, Some examples of an intensive property are:

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Answer:

NH₃

Explanation:

The hydrogen bond is a specially strong type of dipole-dipole interaction. For a hydrogen bond to occur, a molecule must have a hydrogen atom and a very electronegative atom, such as nitrogen, oxygen or fluorine. The hydrogen atom has a positive charge density while the heteroatom has a negative charge density.

Which of the following molecules can form hydrogen bonds?

NH₃ YES

NaH NO

HI NO

BH₃ NO

CH₄ NO

Answer:

105 mg

Explanation:

The following data were obtained from the question:

Original amount (N₀) = 420 mg

Half life (t½) =20 days

Time (t) = 40 days

Amount remaining (N) =..?

Next, we shall determine the rate constant K, for the disintegration.

This can be obtained as follow:

Half life (t½) =20 days

Rate constant (K) =?

K = 0.693/ t½

K = 0.693/20

K = 0.03465 /day

Finally, we shall determine the amount remaining after 40 days as follow:

Original amount (N₀) = 420 mg

Rate constant (K) = 0.03465 /day

Time (t) = 40 days

Amount remaining (N) =..?

Log(N₀/N) = kt/2.3

Log (420/N) = (0.03465 x 40)/2.3

Log (420/N) = 1.386/2.3

Log (420/N) = 0.6026

420/N = antilog (0.6026)

420/N = 4

Cross multiply

420 = N x 4

Divide both side by 4

N = 420/4

N = 105 mg

Therefore, the amount remaining after 40 days is 105 mg.

Answer:

The answer to your question is "Displacement " reaction. Here in the reach Zn +HCl ⇒ZnCl2 + H2 zinc replaces the hydrogen to make the zinc chloride and hydrogen gas is produced as the result and liberated.

Answer:

[See Below]

Explanation:

23 or 23.5 ml.

Answer:

[tex]pH=3.95[/tex]

Explanation:

Hello,

In this case, by using the Henderson-Hasselbach equation we can compute the pH as follows:

[tex]pH=pKa+log(\frac{[base]}{[acid]} )[/tex]

Whereas the concentration of the acid (HCNO) and the base (NaCNO) are computed by considering the given volume:

[tex][base]=\frac{0.410mol}{2.0L}=0.205M[/tex]

[tex][acid]=\frac{0.130mol}{2.0L}=0.065M[/tex]

Therefore, the pH turns out:

[tex]pH=-log(3.5x10^{-4})+log(\frac{0.205M}{0.065M} )\\\\pH=3.95[/tex]

Regards.

Answer :

Part (e): [tex]C_2=\frac{C_1\times P_2}{P_1}[/tex]

Part (f): [tex]P_2=\frac{C_2\times P_1}{C_1}[/tex]

Part (g): [tex]\text{Volume}=\frac{\text{Mass}}{\text{Density}}[/tex]

Explanation :

Part (e):

The given expression is:

[tex]\frac{C_1}{P_1}=\frac{C_2}{P_2}[/tex]

Now rearranging the the terms, we get:

[tex]C_2=\frac{C_1\times P_2}{P_1}[/tex]

Part (f):

The given expression is:

[tex]\frac{C_1}{P_1}=\frac{C_2}{P_2}[/tex]

Now rearranging the the terms, we get:

[tex]P_2=\frac{C_2\times P_1}{C_1}[/tex]

Part (g):

The given expression is:

[tex]\text{Density}=\frac{\text{Mass}}{\text{Volume}}[/tex]

Now rearranging the the terms, we get:

[tex]\text{Volume}=\frac{\text{Mass}}{\text{Density}}[/tex]

Answer:

True

Explanation:

The correct option is; True.

Unimolecular elementary steps in a reaction requires only one reactants, they are usually decomposition reactions. They take the general form;

A --> B + C

Answer: 252

Explanation:

# turn F to C

C=(F-32)5/9

C=(-5-32)5/9

C=-37 × (5/9)

C= -21

# turn C to K

K=C+273

K=(-21)+273

K=252

Answer:

253 Kelvins

Explanation:

We want to convert -5°F to Kelvins.

First, we must convert -5°F to Celsius. The formula is:

°C= (°F - 32) * 5/9

Plug -5 in for °F.

°C= (-5-32) * 5/9

Solve inside the parentheses first. Subtract 32 from -5.

°C= (-37) * 5/9

Multiply -37 and 5/9.

°C= -20.5555556

-5° F is equal to -20.5555556° C.

Next, convert Celsius to Kelvins. The formula is:

K= °C + 273.15

Plug -20.5555556 in for °C.

K= -20.5555556 + 273.15

Add -20.5555556 and 273.15.

K= 252.594444

Round to the nearest whole number. The 5 in the tenth place tells us to round 252 to 253.

K ≈ 253

-5°F is equal to about 253 Kelvins.

Answer:

Uranium must be purified before it is used as a fuel source

Explanation:

The purer the uranium sample, the more the concentration of uranium in the fuel is.

Whenever uranium is extracted from nature, it contains a lot of impurities. Only a few special nuclear reactors can utilize uranium in this raw state. most of the others have to get uranium to become about 3% pure before they begin using it.

To do this, uranium has to be passed through a series of chemical reactions all with the aim of extracting the other compounds that may be present in the fuel.

Answer:

If Jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy,work is being done. Work is said to be done when it transforms energy from one form to another or from one place to another.

Explanation:

Answer:

Metaphase - this is when the chromosomes align

During Metaphase of mitosis, the chomosomes align at the middle part of the cell. Henc ethe correct option is (C).

In cell biology, mitosis is a part of the cell cycle in which replicated chromosomes are separated into two new nuclei.

Cell division by mitosis gives rise to genetically identical cells in which the total number of chromosomes is maintained. Therefore, mitosis is also known as equational division.

During metaphase, the nucleus dissolves and the cell's chromosomes condense and move together, aligning in the center of the dividing cell.

At this stage, the chromosomes are distinguishable when viewed through a microscope.

Learn more about cell division here ;

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#SPJ2

Answer:

density is a PROPERTY that DESCRIBES the MASS of an object to its VOLUME.

Explanation:

Answer:

=10 joules

when multiplying with newtons ( the unit of force)

by a perimeter, it will becone joules, but the specific amount depends on how many newtons and metres there are

Answer:

The volume of the rectangular prism is 77.616 cm³

Explanation:

Here is the remaining part of the question:

Part B:

What value should you use as the area of the base when calculating the answer to Part C.

Part C:

Using the correct answer from Part B, calculate the volume of a rectangular prism with a length of 5.6 cm , a width of 2.1 cm , and a height of 6.6 cm Part B answer: 11.76 cm^2

Explanation:

The volume of a rectangular prism is given by:

V = l×w×h

Where V is the volume of the rectangular prism

l is the length of the rectangular prism

and w is the width of the rectangular prism

Recall that the Area (A) of the base of the rectangular prism can be calculated by using

A = l × w

Hence, the volume of the rectangular prism can also be calculated by substituting this into the equation to give

V = A × h

From the question, the correct answer from part B for the area of the base is 11.76 cm^2; and the height (h) is 6.6 cm

Hence, the volume of the rectangular prism is

V = A × h

V = 11.76 cm² × 6.6 cm

V = 77.616 cm³

Answer:

435 mL

Explanation:

Step 1: Given data

Step 2: Calculate the final volume of the solution

We want to prepare a diluted solution from a concentrated one. We can calculate the final volume of the solution using the dilution rule.

C₁ × V₁ = C₂ × V₂

V₂ = C₁ × V₁ / C₂

V₂ = 0.500 M × 87.0 mL / 0.100 M

V₂ = 435 mL

Answer:

See explanation

Explanation:

The ability of a hydride to act as a reducing agent depends on the electro negativity of the central atom in the complex hydride anion.

If we compare the electronegativities of Boron and Aluminum, Boron is more electronegative than aluminum. The more electronegative the central atom is, the lesser the electron density on the hydride and the lesser its ability to act as a reducing agent.

For the reason stated above, LiAlH4, having aluminium of low electro negativity as its central atom is a better reducing agent than NaBH4.

Answer:

200x

Explanation:

The total magnification of a microscope depends on the power of the eyepiece and that of the objective lens. It is obtained by multiplying the two factors together.

The total magnification of a microscope can be mathematically expressed as:

Total Magnification = ocular/eyepiece magnification x objective magnification

In the illustration, eyepiece magnification = 10 and objective magnification = 20. Hence,

Total Magnification = 10 x 20 = 200x

The magnification power of the microscope has been 200X. Thus, option B is correct.

A microscope has been the instrument used for the analysis of the magnified image of micro-sized or small objects.

The microscope has been consisted of the objective lens and eyepiece that adjusts the level of magnification of the microscope.

The magnification of the microscope has been the product of the power of the eyepiece and objective lens.

Magnification power = Objective lens power [tex]\times[/tex] Eyepiece power

The given power of objective lens = 20

The power of the eyepiece = 10

Magnification power = 20 × 10

Magnification power = 200X.

The magnification power of the microscope has been 200X. Thus, option B is correct.

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The question is incomplete, the complete question is;

Which is most closely associated with the Lewis dot diagrams for molecules that contain atoms of elements from the boron family, Group 13 (Group IIIA)?

a. elements shown as 3+ ions

b. expanded octets of electrons

c. incomplete octets of electrons

d. odd number of valence electrons

e. kernel electrons promoted to the valance shell

Answer:

incomplete octets of electrons

Explanation:

A Lewis dot structure is a representation of a molecule based on the number of valence electrons on its valence shell. These electrons are shown as dots hence Lewis structures are also called dot electron structures.

For elements of group 13, they mostly form dimeric compounds due to the fact that their compounds possess an incomplete octet of electrons. This is common to group 13 elements, hence the answer above.

Explanation:

a) Corrosive and b) Reacts with certain metals

Answer:

Explanation:

The density of a substance can be found by using the formula

From the question

mass = 498 g

volume = 11.9 mL

Substitute the values into the above formula and solve for the Density

That's

We have the final answer as

Hope this helps you

Answer:

(a) Dissolving sugar in water  ⇒ physical change

(b) Crushing rock salt  ⇒ physical change

(c) Burning sulfur  ⇒ chemical change

(d) Digesting a chili dog ⇒ chemical change

Explanation:

Physical changes are those in which the substance does not alter its composition. They only involve changes of states of  matter and the chemical substance is stil the same after the change occurs. By other hand, chemical changes are those in which new subtances are formed. So, the subtance is not the same after the change.

(a) Dissolving sugar in water  ⇒ physical change; because we obtain a solution of sugar in water (sugar is stil sugar).

(b) Crushing rock salt  ⇒ physical change; because we obtain crushed salt, but the chemical composition of the salt is not altered.

(c) Burning sulfur  ⇒ chemical change; because sulfur is oxidized (chemical reaction) and new compounds are formed, for example sulfur dioxide.  

(d) Digesting a chili dog ⇒ chemical change; because the digestion process is produced by the action of hydrocloric acid, and new compounds are formed.

Step 7- Communicate. Present/share your results. Replicate.

Step 1- Question.

Step 2-Research.

Step 3-Hypothesis.

Step 4-Experiment.

Step 5-Observations.

Step 6-Results/Conclusion.

Answer:

33600 J

Explanation:

From the question,

ΔH = cm(t₂-t₁)..................... Equation 1

Where, ΔH = Enthalpy change of water, c = specific heat capacity of water, m = mass of water, t₂ = Final temperature of water, t₁ = Initial temperature of water

Given: c = 4200 J/kg.°C, m = 100 g = 0.1 kg, t₂ = 50°C, t₁ = -30°C

Substitute these values into equation 1

ΔH = 4200(0.1)(50+30)

ΔH = 420(80)

ΔH = 33600 J

Answer:

3 mL

Explanation:

1 cubic centimeter (cm³) is equal to 1 milliliter (mL).

We want to find out how many milliliters 3 cm³ is equal to.

Since 1 cm³ is equal to 1 mL, 3 cm³ is equal to 3 mL.

The quantity of 3.00 cm³ is the same as 3 milliliters (mL).

Answer:

27 or [tex]3.00^{3}[/tex] (they're the same)

Explanation:

Therefore, 27 cm is the same as 27 mL.

Answer:

490 in^3 = 8.03 L

Explanation:

Given:

The engine displacement = 490 in^3

= 490 in³

To determine the engine piston displacement in liters L;

(NOTE: Both in^3 (in³) and L are units of volume). Hence, to find the engine piston displacement in liters (L), we will convert in^3 to liters (L)

First, we will convert in³ to cm³

Since 1 in = 2.54 cm

∴ 1 in³ = 16.387 cm³

If 1 in³ = 16.387 cm³

Then 490 in³ =  (490 in³ × 16.387 cm³) / 1 in³ = 8029.63 cm³

∴ 490 in³ = 8029.63 cm³

Now will convert cm³ to dm³

(NOTE: 1 L = 1 dm³)

1 cm = 1 × 10⁻² m = 1 × 10⁻¹ dm

∴ 1 cm³ = 1 × 10⁻⁶ m³ = 1 × 10⁻³ dm³

If 1 cm³ = 1 × 10⁻³ dm³

Then, 8029.63 cm³ = (8029.63 cm³ × 1 × 10⁻³ dm³) / 1 cm³ = 8.02963 dm³

≅ 8.03 dm³

∴ 8029.63 cm³ = 8.03 dm³

Hence, 490 in³ = 8029.63 cm³ = 8.03 dm³

Since 1L = 1 dm³

∴ 8.03 dm³ = 8.03 L

Hence, 490 in³ = 8.03 L

An engine piston displacement of 490 in³ is equivalent to 8.03 L.

The engine piston displacement is 490 in³ and we want to convert it to liters. Since both of them are units of volume, we will need one or more conversion factors.

A conversion factor is an arithmetical multiplier for converting a quantity expressed in one set of units into an equivalent expressed in another.

We will use the conversion factor 1 in = 2.54 cm.

490 in³ × (2.54 cm/1 in)³ = 8.03 × 10³ cm³

We will use the conversion factor 1 L = 1000 cm³.

8.03 × 10³ cm³ × (1 L/1000 cm³) = 8.03 L

An engine piston displacement of 490 in³ is equivalent to 8.03 L.

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Explanation:

plant cells are rigid in shape

animal cells are flexible in shape

animal cell are flexible because of their movement around

plant cells are rigid cause they stay without walking around

Answer:the answer is hypothesis

Explanation: that’s the answer

Answer:

It is becoming more acidic.

Explanation:

The pH scale is a way to express the concentration of hydrogen ions. This scale goes from 0 to 14 and it is adimensional.

The lower the pH, the more acidic the solution. Since the pH of the garden soil of Olivia is decreasing, it is becoming more acidic.