0. October 1 a year later
5. An observer on the North Pole sees the Moon as shown below. What moon phase will she observe approximately one week later?
O A First quarter
O B. Full Moon
O c. Waning gibbous
OD. New Moon
Activate W

Answer:

i'm pretty sure it's 'transport oxygen from the lungs to tissues around the body'

Answer:

Transportation of Oxygen from Lungs to Tissues

Explanation:

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:

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:

I can help

Explanation:

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:

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.

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:

Explanation:

You can think of pH as "parts Hydrogen ion," but remember that the pH scale is "backwards." The pH scale ranges from 0 to 14, with zero being the most acidic (highest concentration of H+) and 14 being the most basic.

The pH of an aqueous solution will be:

D. 9

When the [tex]H_3O^+[/tex] ion concentration is less than its [tex]OH^-[/tex] ion concentration.

pH is used to indicate whether a solution is acidic or alkaline depending upon the pH of the solution. If pH is below 7 then the solution is acidic, if the pH is above 7 then the solution is basic and if the pH is 7 then the solution is neutral.

When the [tex]H_3O^+[/tex] ion concentration is less than its [tex]OH^-[/tex] ion concentration this means that the solution has more  [tex]OH^-[/tex] ion and this makes the solution basic.

Thus, correct option is D, i.e. pH is 9.

Find more information about pH here:

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Answer:

3 oxygen atom

hope it helps.

Answer:

Explanation:

There are 3 oxygen atoms.

Can you choose me brainliest?

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:

CaCI2 + H2O = Ca(OH)2 + HCI

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:

Environmental limitations.

Explanation:

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:

56.0774g/mol

Explanation:

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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:

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.

Answer:

covalent network

Explanation:

trust me on this one

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.  

Explanation:

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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:

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:

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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:

the oxidation number is 4