13. This is an example of Earth's...
a. revolution.
b. rotation.
C. spiraling
d. turning

Answer:

Thus, the proportion of Earth's surface that is covered by ice and snow affects how much of the Sun's solar radiation is absorbed, warming the planet, or reflected. Therefore, snow and ice which are covered in soot from pollution no longer reflect sunlight, but absorb it and so melting increases.

Answer:

Half of the solar radiation is absorbed and converted to infrared (heat).

Explanation:

Answer:

I can help

Explanation:

Answer: There are 0.854 moles of [tex]Al_{2}(CO_{3})_{3}[/tex] present in 200 g of [tex]Al_{2}(CO_{3})_{3}[/tex].

Explanation:

Given: Mass of [tex]Al_{2}(CO_{3})_{3}[/tex] = 200 g

As number of moles is the mass of substance divided by its molar mass.

Molar mass of [tex]Al_{2}(CO_{3})_{3}[/tex] is 233.99 g/mol.

Therefore, moles of [tex]Al_{2}(CO_{3})_{3}[/tex] is calculated as follows.

[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{200 g}{233.99 g/mol}\\= 0.854 mol[/tex]

Thus, we can conclude that there are 0.854 moles of [tex]Al_{2}(CO_{3})_{3}[/tex] present in 200 g of [tex]Al_{2}(CO_{3})_{3}[/tex].

Answer:

56.0774g/mol

Explanation:

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Answer:

There are 1.8×1024 atoms in 1.5 mol HCl

Explanation:

Answer:

1. C = 0.73 M.

2. pH = 0.14

Explanation:

The reaction is the following:

HCl + NH₃ ⇄ NH₄⁺Cl⁻

From the titration, we can find the number of moles of HCl that were neutralized by the ammonia.

[tex] n_{a} = n_{b} [/tex]

Where "a" is for acid and "b" is for base.

The number of moles is:

[tex] n = C*V [/tex]  

Where "C" is for concentration and "V" for volume.

[tex] C_{a}V_{a} = C_{b}V_{b} [/tex]

[tex] C_{a} = \frac{0.1293 M*28.15 mL}{5.00 mL} = 0.73 M [/tex]

Hence the initial concentration of the acid is 0.73 M.

The original pH of the acid is given by:

[tex] pH = -log([H^{+}]) [/tex]

[tex] pH = -log(0.73) = 0.14 [/tex]          

Therefore, the original pH of the acid is 0.14.

I hope it helps you!                  

Answer:

1 1

Explanation:

Hill

1

Cooled in ice to help the water vapour condense. Tube 2 – contains lime water, goes cloudy to show the presence of carbon dioxide. Word equation: (hydrocarbon + oxygen → carbon dioxide + water) Methane + oxygen → carbon dioxide + water.

Answer:

3

Explanation:

because 3CuSO and the 3 in front present how many it has

Answer:

Calcium oxide, commonly known as lime, is a chemical compound with the formula CaO.

Answer:

The pressure is doubled, 4.0atm

Explanation:

Based on Boyle's law, the pressure of a gas is inversely proportional to its volume at constant temperature. The equation that describes this law is:

P1V1 = P2V2

Where P is pressure and V volume at 1, initial state and 2, final state of the gas.

Computing the values of the problem:

P1 = 2.0atm

V1 = 3.0L

P2 = ?

V2 = 3.0L / 2 = 1.5L

Replacing:

2.0atm*3.0L = P2*1.5L

6.0atmL / 1.5L = P2

4.0atm = P2

Answer:

Constant

Explanation:

Here's the definition of the noun:

"A situation that does not change"

In this case the situation is the speed of the object.

If you'd like to go into further detail, let's move away from English and jump into Physics. The question asked for "object's force" - keyword: 'force'. What's the formula for force? F = m * a.

F = Force, m = mass, a = acceleration.

Okay well, the question said only the speed changes and doesn't mention the mass changing so if the mass changes the force won't be constant. However, if the mass doesn't change (constant), we can continue to acceleration.

The formula for acceleration is (I think) m/s^2, that's metres over time, squared. As we know from English class; the speed is constant and thus the square of that speed is also constant - therefore the acceleration is constant.

Now, putting them together, assuming the mass is constant, we know the acceleration is constant so the force has to be constant. Case closed.

*mic drops, this was a waste of time*

Answer:

12.213 minutes will be taken for 120 g-Thalium-208 to decay to 75 grams.

Explanation:

Radioactive isotopes decay exponentially in time, the mass of the isotope ([tex]m(t)[/tex]), in grams, is described by the formula in time ([tex]t[/tex]), in minutes:

[tex]m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }[/tex] (1)

Where:

[tex]m_{o}[/tex] - Initial mass of the isotope, in grams.

[tex]\tau[/tex] - Time constant, in minutes.

In addition, the time constant associated with the isotope decay can be described in terms of half-life ([tex]t_{1/2}[/tex]), in minutes:

[tex]\tau = \frac{t_{1/2}}{\ln 2}[/tex] (2)

If we know that [tex]m(t) = 7.5\,g[/tex], [tex]m_{o} = 120\,g[/tex] and [tex]t_{1/2} = 3.053\,min[/tex], then the time taken by the isotope is:

[tex]\tau = \frac{t_{1/2}}{\ln 2}[/tex]

[tex]\tau = \frac{3.053\,min}{\ln 2}[/tex]

[tex]\tau \approx 4.405\,min[/tex]

[tex]t = -\tau \cdot \ln \frac{m(t)}{m_{o}}[/tex]

[tex]t = -(4.405\,min)\cdot \ln \left(\frac{7.5\,g}{120\,g} \right)[/tex]

[tex]t \approx 12.213\,min[/tex]

12.213 minutes will be taken for 120 g-Thalium-208 to decay to 75 grams.

12.21 minutes will it take for 120 g of Thallium-208 to decay

to 7.5 g.

Half life period is that time in which half of the reactant is convert into product.

In the question it is given that,

Initial mass of Thallium-208 = 120g

Final mass after decay = 7.5g

And half life of this decay = 3.053 min

Here we can calculate the total time of decay by the formula : T = t × n.

Where, T = total required time

t = half life

n = no. of half life required to decompose reactant.

120 → 60 →30 → 15 → 7.5

From the above sequence it is clear that we require 4 times of half life to decompose 120g to 7.5g.

So, T = 3.053 × 4 = 12.21 minutes

Hence, 12.21 minutes will it take to decay.

To learn more about half life, visit below link:

https://brainly.com/question/2320811

Answer:

See below

Explanation:

The atmosphere of the earth hundreds of millions of years ago was only water vapour and carbon, both from the one ocean that existed around the continental body of Pangea. The photosynthesis process and exache (⊕) caused the percentages to decrease.

Answer:

CaCI2 + H2O = Ca(OH)2 + HCI

Answer:

a mixture of two these

Explanation:

The number of isomeric monochlorides depends on the structure and number of equivalent hydrogen atoms in each isomer of pentane.

n-pentane has three different kinds of equivalent hydrogen atoms leading to three isomeric monochlorides formed.

Isopentane has four different types of equivalent hydrogen atoms hence four isomeric monochlorides are formed.

Lastly, neopentane has only one type of equivalent hydrogen atoms that yields one mono chlorination product.

Hence the cylinder must contain a mixture of isopentane and neopentane which yields four and one isomeric monochlorides giving a total of five identifiable monochloride products as stated in the question.  

Answer:

Filtration and evaporation

Explanation:

A mixture of sand, pink sugar and water can be separated by filtration and evaporation.

The pink sugar is already dissolved in the water but the sand remains undissolved in the water hence it can be filtered off. The filtrate now contains the sugar.

The sugar is obtained from the filtrate by evaporation of the solution to yield the solid pink sugar and steam which can be condensed again to give liquid water.

Answer:

0.659 M NaCl

Explanation:

Equation: Molarity = moles of solute / liters of solution

1. To find moles of solute:

78.0 g NaCl x 1 mol NaCl / 58.44 g NaCl

= 1.334 mol NaCl

2. Calculate molarity

Transfer 2,025 mL to L

1.334 / 2.025 = 0.659 M NaCl (rounded)

The molarity of the sample of seawater that contains 78.0 grams of NaCl in 2,025 mL of solution is 0.66M.

The molarity of a solution can be calculated by dividing the number of moles by its volume.

However, the number of moles of the substance can be calculated as follows:

no of moles = 78g ÷ 58.443g/mol

no of moles = 1.335mol

molarity = no of moles ÷ volume

molarity = 1.335mol ÷ 2.025L

molarity = 0.66M

Therefore, the molarity of the sample of seawater that contains 78.0 grams of NaCl in 2,025 mL of solution is 0.66M.

Learn more about molarity at: https://brainly.com/question/2817451

Explanation:

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Answer:

By using insulating material.

Explanation:

By making the material cover with insulator in that way the we can protect the workers from the dangers of high heat because the insulator are the poor conductor of heat so the heat from the surrounding environment did not enter inside the metal. There are certain materials which remain cool if they receive  heat from the surrounding environment so by using these types of materials can be useful on the cover of caisson to reduce heat in the inner side and protect the workers from the dangers of high heat.

Answer: Magnesium metal will have the smallest increase in temperature.

Explanation:

Given: Specific heats are as follows.

Copper = 0.385 J/g K,     Magnesium = 1.020 J/g K

Mercury = 0.138 J/g K,     Platinum = 0.130 J/g K

Heat energy = 100 kJ  (1 kJ = 1000 J) = 100000 J

mass = 10.0 g

Initial temperature = [tex]25^{o}C[/tex]

Formula used to calculate the increase in temperature for each of the given elements is as follows.

[tex]q = m \times C \times (T_{2} - T_{1})[/tex]

where,

q = heat energy

m = mass

C = specific heat

[tex]T_{1}[/tex] = initial temperature

[tex]T_{2}[/tex] = final temperature

[tex]q = m \times C \times (T_{2} - T_{1})\\100000 = 10.0 g \times 0.385 J/g K \times (T_{2} - 25)\\T_{2} = 25999.026^{o}C[/tex]

[tex]q = m \times C \times (T_{2} - T_{1})\\100000 = 10.0 g \times 1.020 J/g K \times (T_{2} - 25)^{o}C\\T_{2} = 9828.92^{o}C[/tex]

[tex]q = m \times C \times (T_{2} - T_{1})\\100000 = 10.0 g \times 0.138 J/g K \times (T_{2} - 25)^{o}C\\T_{2} = 72488.77^{o}C[/tex]

[tex]q = m \times C \times (T_{2} - T_{1})\\100000 = 10.0 g \times 0.130 J/g K \times (T_{2} - 25)^{o}C\\T_{2} = 76948.08^{o}C[/tex]

Thus, we can conclude that magnesium metal will have the smallest increase in temperature.

Answer:

covalent network

Explanation:

trust me on this one

Answer:

3.01×10²⁴ molecules of H₂

Explanation:

Reaction that can produce hydrogen gas from Pb can be this:

Pb + H₂S →  PbS + H₂

1 mol of Pb can react to 1 mol of H₂S to produce 1 mol of PbS and 1 mol of H₂

Ratio is always 1:1.

In conclussion 5 moles of lead will produce 5 moles of H₂.

Let's apply the NA to count molecules

1 mol contains 6.02×10²³

Then, 5 moles must contain (5 . 6.02×10²³) = 3.01×10²⁴ molecules

Explanation:

colloid is a mixture in which one substance of microscopically dispersed insoluble particles are suspended throughout another substance. However, some definitions specify that the particles must be dispersed in a liquid,[1] and others extend the definition to include substances like aerosols and gels. The term colloidal suspension refers unambiguously to the overall mixture (although a narrower sense of the word suspension is distinguished from colloids by larger particle size). A colloid has a dispersed phase (the suspended particles) and a continuous phase (the medium of suspension). The dispersed phase particles have a diameter of approximately 1 nanometre to 1 micrometre.[

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Answer:

colloids are mixtures in which one or more substances are dispersed as relatively large solid particles or liquid droplets throughout a solid ,liquid or gaseous medium .The particles of a colloid remain and do not settle due to gravity ,and they are often electrically charged

Answer:

I need to see the galaxy to answer your question

Answer:

the oxidation number is 4

Answer:

Environmental limitations.

Explanation: