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Answer:

I think 50 grams only because you have pour 50 grams of solute in to 800 grams of solvent.

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.

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Answer:

Explanation: It is an ionic compound  Fe2(C2O4)3

The compound  with the formula Fe₂(C₂O₄)₃ contains two iron atoms, 6 carbon atoms and 12 oxygen atoms. Thus option C is correct.

Chemical formula of a compound or molecule represent the identity of the compound by representing which atoms are present in how many numbers.

Chemical formula is significant in representing a compound and distinguish it from other compounds.The number of each atom are given as subscripts for the symbol of each atoms.

If any group of atoms such SO₄ group or CO₃ group repeats in the compound put them in brackets and their number is given outside.The compound Fe₂(C₂O₄)₃ contains 2 iron atoms because Fe is the symbol of iron.

C₂O₄ is oxalate group and it is 3 in number. Two carbon and 4 oxygens are there in one oxalate group. Thus there are total 6 carbons and 12 oxygens in 3 oxalate groups. Hence option C is correct.

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Answer:

-1151.5 J

Explanation:

Given that:

The supplies energy = 245 L

The energy used in the expansion of gas = Pressure ×ΔV (change in volume)

At standard conditions;

Pressure = 105 × 10³ Pa

energy used in the expansion = 105 × 10³ Pa × (38.6 - 25.3)L

= 1396.5 J

Thus, the change in the energy of gas = 245 - 1396.5 J

= -1151.5 J

Hence, we can conclude that the gas has lost its own energy in the process of expansion.

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:

CaCI2 + H2O = Ca(OH)2 + HCI

Answer:

Environmental limitations.

Explanation:

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:

Yeah

Explanation:

Propylene glycol can be dehydrated to propionaldehyde which can in turn be reductively aminated to propylamine.

Propionaldehyde can be converted to n-propyl amine in two steps.

Conversion of propionaldehyde to oxime

Propionaldehyde is treated with hydroxyl amine in weakly acidic medium to form imine product known as propionaldoxime.

CH₃CH₂CHO+NH₂OH->CH₃CH₂CH=N-OH+H₂O

Reduction of imine to form amine

In this step,propionaldoxime is reduced by proper reducing agent like Na in ethanol to form n-propyl amine.

CH₃CH₂CH=NO-Na-C₂H5OH-> CH₃CH₂CH₂NH₂

Answer:

ФОТОГРОФИРУЙ

ИЛИ НАПИШИ

В КОМЕНТЫ

Answer:

covalent network

Explanation:

trust me on this one

Answer:

T2 = 547.2K

Explanation:

Given:

V1 = 135 ml. V2 = 250 ml

T1 = 295.5K. T2 = ?

Using Charles's law and solving for T2,

V1/T1 = V2/T2

T2 = (V2/V1)T1

= (250 ml/135 ml)(295.5K)

= 547.2K (or 273.2°C)

Answer:

Ea = 210.5kJ/mole

Explanation:

When the reaction:

O3 + NO → O2 + NO2

Occurs, requires 10.7kJ/mole and releases -199.8kJ/mole.

For the forward reaction:

O2 + NO2 → O3 + NO

The Ea is the sum of Ea of the forward reaction and - ΔH, that is:

Ea = Ea - (-ΔH)

Ea = 10.7kJ/mol - (-199.8kJ/mol)

Ea = 210.5kJ/mole

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:

depends on how much jelly u like

Explanation:

hope it is helpful to you ☺️

Answer:

See Explanation

Explanation:

Elements in group fourteen are mostly known to form compounds in which there are four electron domains leading to a tetrahedral electron domain geometry.

However, the presence of lone pairs affects the shape of the molecule. SnCl3− has four electron domains, three of them are bond pairs while one is a lone pair. The shape of the molecule is based on a tetrahedron, however the observed geometry is trigonal pyramidal due to the presence of the lone pair. Its bond angle is now less than the predicted 109 degrees.

Answer:

C) drain cleaner fizzes up as it encounters blockages in a pipe

Explanation:

Answer:

See Explanation

Explanation:

A biosphere is a zone of life found on earth. Since the artificial biosphere has all the elements that support and sustain human life, then there must also be soil in the artificial biosphere.

If that is the case, then we can engage in massive tree planting. Trees take in carbon dioxide and release oxygen. Hence if a large number of trees are planted all over the artificial biosphere, the trees will eventually produce large enough oxygen to support human life overtime.

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:

2.47L

Explanation:

Using the combined gas law equation as follows:

P1V1/T1= P2V2/T2

Where;

P1 = initial pressure (mmHg)

P2 = final pressure (mmHg)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information provided in this question;

P1 = 705mmHg

P2 = 760mmHg (STP)

V1 = 3.00L

V2 = ?

T1 = 35°C = 35 + 273 = 308K

T2 = 273K (STP)

Using P1V1/T1= P2V2/T2

705 × 3/308 = 760 × V2/273

2115/308 = 760V2/273

Cross multiply

308 × 760V2 = 2115 × 273

234,080V2 = 577,395

V2 = 577,395 ÷ 234,080

V2 = 2.47L

Answer:

The line with spikes and semicircles is a stationary front, it brings days of steady rain.

Explanation:

L means Low pressure, it brings stormy weather with strong winds.

H means High pressure, it brings fair weather and light winds.

The line with spikes is a cold weather front, it brings thunderstorms and colder

temperatures.

The line with spikes and semicircles is a stationary front, it brings days of steady rain.

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.[

hope it helps.

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:

the oxidation number is 4

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:

Deduce the balanced chemical equation:

CaCO3(s) + 2HCl(aq) > CaCl2 + H2O(l) + CO2(g)

2. Write as ionic species:

Ca2+(aq) + CO3 2- (aq) + 2H+ + 2Cl- > Ca2+(aq)+ 2Cl-(aq) + H2O(l) + CO2(g)

3. Identify ions on the right that also appear on the left, and eliminate them. (As Robert Cruikshank says, these are known as ’spectator ions’ and take no overall part in the reaction):

CO3 2- (aq) + 2H+(aq) > H2O(l) + CO2(g)

This is the balanced ionic equation.

Answer:

I can help

Explanation:

Answer:

The density of igneous rocks is related to its color. Darker colored rocks have a higher density because of its greater mineral and iron content. Its characteristics is opposite compared to lighter colored rocks that have less density because of lower mineral and iron content

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.