For the acids, use the formula pH = -log[H+). (Because HCl has 1 H+ ion per formula unit, [H+] equals the

molarity.) For water, use what you know about the pH of neutral solutions. For the bases, examine and

extend the pattern. DONE

0.1 M

НСІ

0.001 M

НСІ

0.00001 M

НСІ

Distilled

Water

0.00001 M

NaOH

0.001 M

NaOH

0.1 M

NaOH

pH

pH:

pH:

pH: 7

pH:

pH:

pH:

Answer:

Water is necessary for life because water carries nutrients to all of our cells. Water also carries oxygen to the brain and allows our body to absorb minerals and vitamins

Explanation:

hope this helps! good luck :)

Answer:

–500KJ

Explanation:

Data obtained from the question include the following:

Heat of reactant (Hr) = 800KJ

Heat of product (Hp) = 300KJ

Enthalphy change (ΔH) =..?

The enthalphy change is simply defined as the difference between the heat of product and the heat of reactant i.e

Enthalphy change = Heat of product – Heat of reactant

ΔH = Hp – Hr

With the above formula, we can easily calculate the enthalphy change as follow

ΔH = Hp – Hr

ΔH = 300 – 800

ΔH = –500KJ.

Therefore, the overall energy change for the reaction between hydrogen and oxygen shown in the diagram above is –500KJ

Answer:

B).  Allow efficient gathering of unobservable phenomena.

Explanation:

Surveys are described as the method of gathering information from a specified group of respondents for purposes like research or assessment of the truth of thoughts or opinions associated with a process.

As per the question, one of the most considerable benefits of the survey is that 'it allows the efficient gathering of unobservable phenomena'. The data associated with phenomena like stated preferences, behaviors, beliefs, and factual information are unobservable and can not be collected through observation but surveys help in doing so as well as in the assessment of the validity or reliability of the existing propositions about such phenomena. Thus, option B is the correct answer.

Answer: b

Explanation:

Answer:

The answer is A

Explanation:

Because . . .

- A is correct because scientist make their statements by using their observations and tools to measure.

- B is incorrect people's opinions are not facts! Plus, opinions can be wrong.

- C is incorrect because that book can be outdated and not every answer is in a book.

- D is absolutely incorrect because guessing a "right" answer can be wrong. For example, if you were a scientist and you guessed a treatment for coronavirus, you will defiantly get fired because you don't have evidence or logic to back up your answer. In addition, if people used ur "treatment" the one you have guessed as the "right" answer, you can put people's lives in danger and they can possibly die. You will defiantly be responsible for it and be put into jail.

Answer:A

Explanation:

Answer:

[tex]\large \boxed{35.6 \,^{\circ}\text{C}}[/tex]

Explanation:

There are two heat transfers involved: the heat lost by the granite and the heat gained by the water.

According to the Law of Conservation of Energy, energy can neither be destroyed nor created, so the sum of these terms must be zero.

Let the granite be Component 1 and the water be Component 2.

Data:  

For the granite:

[tex]m_{1} =\text{75.0 g; }T_{i} = 92.5 ^{\circ}\text{C; }\\C_{1} = 0.790 \text{ J$^{\circ}$C$^{-1}$g$^{-1}$}[/tex]

For the water:

[tex]m_{2} =\text{60.0 g; }T_{i} = 22.2 ^{\circ}\text{C; }\\C_{2} = 4.184 \text{ J$^{\circ}$C$^{-1}$g$^{-1}$}[/tex]

Calculations

(a) The relative temperature changes

[tex]\begin{array}{rcl}\text{Heat lost by granite + heat gained by water} & = & 0\\m_{1}C_{1}\Delta T_{1} + m_{2}C_{2}\Delta T_{2} & = & 0\\\text{75.0 g}\times 0.790 \text{ J$^{\circ}$C$^{-1}$g$^{-1}$} \times\Delta T_{1} + \text{60.0 g} \times 4.184 \text{ J$^{\circ}$C$^{-1}$g$^{-1}$}\Delta \times T_{2} & = & 0\\59.25\Delta T_{1} + 251.0\Delta T_{2} & = & 0\\\end{array}[/tex]

(b) Final temperature of water

[tex]\Delta T_{1} = T_{\text{f}} - 92.5 ^{\circ}\text{C}\\\Delta T_{2} = T_{\text{f}} - 22.2 ^{\circ}\text{C}[/tex]

[tex]\begin{array}{rcl}59.25(T_{\text{f}} - 92.5 \, ^{\circ}\text{C}) + 251.0(T_{\text{f}} - 22.2 \, ^{\circ}\text{C}) & = & 0\\59.25T_{\text{f}} - 5481 \, ^{\circ}\text{C} + 251.0T_{\text{f}} - 5572 \, ^{\circ}\text{C} & = & 0\\310.2T_{\text{f}} - 11052\, ^{\circ}\text{C} & = & 0\\310.2T_{\text{f}} & = & 11052 \, ^{\circ}\text{C}\\T_{\text{f}}& = & \mathbf{35.6 \, ^{\circ}}\textbf{C}\\\end{array}\\\text{The final temperature is $\large \boxed{\mathbf{35.6 \,^{\circ}}\textbf{C}}$}[/tex]

Answer:

I think A) a phase change occurs

Answer:

a new gas is observed in the form of bubbles

Explanation:

just did it!

Answer:

The answer is Osmosis........

Answer:

osmosis

Explanation:

osmosis is a method of passive transport in cells. osmosis in passive transport cells is of water

Answer:

A.The concentration of water is greater outside the cell than inside the cell.

Explanation:

The contractile vacuole of certain organisms functions to regulate water flow in and out of the cell. It does this by storing excess water that comes into the cell. In the case of this organism with a filled up contractile vacuole, it means water is flowing into the cell.

Naturally, water will flow into a living cell when an osmotic gradient i.e. difference in concemtration, has been created between intracellular and extracellular solutions. Osmosis involves movement of substances from a region of high water concentration to a region of low water concentration. This means that if water is flowing into the cell, which is stored by the contractile vacuole, the concentration of water must be greater outside the cell than inside.

Answer:

Rises, sinks

the correct answer is B

Answer:

rises, sinks

Explanation:

Hot magma rises because as the temperature increases, it expands and becomes less dense. As it reaches the top, it cools down and becomes more dense, which means it will sink. Therefore, hot magma rises and cool magma sinks in convection mantle mechanism.

Answer:

113.4g of N2

Explanation:

Step 1:

The balanced equation for the reaction.

N2 + 3H2 —> 2NH3

Step 2:

Determination of the mass of N2 and H2 that reacted from the balanced equation. This is illustrated below:

Molar mass of N2 = 2x14 = 28g/mol

Mass of N2 from the balanced equation = 1 x 28 = 28g

Molar mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 3 x 2 = 6g

From the balanced equation above, 28g of N2 reacted with 6g of H2.

Step 3:

Determination of the mass N2 required to react with 24.3g of H2.

The mass of N2 required to react with 24.3g of H2 can be obtained as follow:

From the balanced equation above, 28g of N2 reacted with 6g of H2.

Therefore, Xg of N2 will react 24.3g of H2 i.e

Xg of N2 = (28 x 24.3)/6

Xg of N2 = 113.4g

Therefore, 113.4g of N2 is required to react completely with 24.3g of H2.

24.3g H2 × 1 mol H2/2.016g H2 × 1 mol N2/3 mol H2 × 28.014 g N2/1 mol N2 = 113g N2

Answer : The theoretical yield in grams for this reaction under the given conditions is, 8.28 grams.

Explanation : Given,

Mass of [tex]H_2[/tex] = 1.46 g

Mass of [tex]N_2[/tex] = 10.5 g

Molar mass of [tex]H_2[/tex] = 2 g/mol

Molar mass of [tex]N_2[/tex] = 28 g/mol

First we have to calculate the moles of [tex]H_2[/tex] and [tex]N_2[/tex].

[tex]\text{Moles of }H_2=\frac{\text{Given mass }H_2}{\text{Molar mass }H_2}[/tex]

[tex]\text{Moles of }H_2=\frac{1.46g}{2g/mol}=0.73mol[/tex]

and,

[tex]\text{Moles of }N_2=\frac{\text{Given mass }N_2}{\text{Molar mass }N_2}[/tex]

[tex]\text{Moles of }N_2=\frac{10.5g}{28g/mol}=0.375mol[/tex]

Now we have to calculate the limiting and excess reagent.

The balanced chemical equation is:

[tex]3H_2+N_2\rightarrow 2NH_3[/tex]

From the balanced reaction we conclude that

As, 3 mole of [tex]H_2[/tex] react with 1 mole of [tex]N_2[/tex]

So, 0.73 moles of [tex]H_2[/tex] react with [tex]\frac{0.73}{3}=0.243[/tex] moles of [tex]N_2[/tex]

From this we conclude that, [tex]N_2[/tex] is an excess reagent because the given moles are greater than the required moles and [tex]H_2[/tex] is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of [tex]NH_3[/tex]

From the reaction, we conclude that

As, 3 mole of [tex]H_2[/tex] react to give 2 mole of [tex]NH_3[/tex]

So, 0.73 mole of [tex]H_2[/tex] react to give [tex]\frac{2}{3}\times 0.73=0.487[/tex] mole of [tex]NH_3[/tex]

Now we have to calculate the mass of [tex]NH_3[/tex]

[tex]\text{ Mass of }NH_3=\text{ Moles of }NH_3\times \text{ Molar mass of }NH_3[/tex]

Molar mass of [tex]NH_3[/tex] = 17 g/mole

[tex]\text{ Mass of }NH_3=(0.487moles)\times (17g/mole)=8.28g[/tex]

Therefore, the theoretical yield in grams for this reaction under the given conditions is, 8.28 grams.

Answer:

The probability of finding the particle somewhere in the universe must be equal to 1.

Answer:

Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat.  Conduction is the transfer of heat between substances that are in direct contact with each other. Thermal energy is transferred from hot places to cold places by convection. Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object as is the case with conduction and convection. Heat can be transmitted through empty space by thermal radiation often called infrared radiation.

The thermal energy transfer may take place within the iguana’s enclosure through Conduction, Convection, and Radiation.

In conduction, heat transfer happens between objects by direct contact. If the heat transfer takes within the fluid then it is In convection. In radiation, heat transfers without involving particles through electromagnetic waves.

In conduction, Heat transfer occurs because of the difference in temperature. In convection, heat transfer occurs due to the difference in density. In radiation, heat transfer occurs with a temperature greater than 0 K  in all objects.

In convection, heat transfer in conduction is slow while in convection, heat transfer, in convection is faster and in radiation, the heat transfer in radiation is the fastest.

Conduction and convection heat transfer does not follow the law of refraction and reflection. Radiation heat transfer follows the law of refraction and reflection.

Learn more about Conduction, Convection, and Radiation, here:

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Answer:

So as the reaction proceeds we lose energy as the reaction is exothermic due to the delta H being negative, this shows that heat flows from the system to its surroundings.

Explanation:

2H6O (l) + 3O2 (g) = 2CO2 (g) + 3H2O (g)

2CH3CH2OH(l) + 3O2(g) = 2CO2(g) + 3H2O(g) ΔH = -1234.8kJ/mol

I'm pretty sure this is what your equation is supposed to be, seems to be an error where you've pasted it and it's replaced the O's with )

So as the reaction proceeds we lose energy as the reaction is exothermic due to the delta H being negative, this shows that heat flows from the system to its surroundings.

Answer:

Explanation:

1. lithium=Li

2.berilium=Be

3.carbon=C

4.Lithium= Li1+

The elements with their symbols and charge are:

1. Lithium, Li, charge is 1.

2. Beryllium, Be, charge is 2+

3. Carbon, C

4. Lithium, Li, charge is 1+

Chemical elements are the base of everything present on the Earth. These elements are present under the earth.

There are 118 elements traced and are present in either free or mixed form.

Thus, the correct options are 1. Lithium, Li, charge is 1.

2. Beryllium, Be, charge is 2+

3. Carbon, C

4. Lithium, Li, charge is 1+

Learn more about chemical elements

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Answer:

A scale, or a weight. Both of which are more scientifically referred to as a balance.

The answer is a Balance