A gas occupies 318 liters at 10.0 atm. What is the pressure if the volume becomes 662.5 L?

Out of the options, the best indicator is a color change since it is the only one that can't really be blamed on a physical change.  you will eventually notice that during qualitative labs and some quantitative labs, usually the thing that you are looking for is either color change or the production of a precipitate to indicate the presence of a chemical reaction  

The correct answer is 2) change of color

Explanation:

A chemical change occurs when a new substance is formed or the original substance changes its identity and composition due to a chemical reaction. This is the opposite of a physical change that modifies only physical properties such as state or shape. Moreover, a chemical reaction can be identified because if often leads to a change in color, odor, the formation of bubbles or temperature change. This implies the only one that suggests a chemical change is a change of color because this occurs if the composition of a substance or substances change.

Answer:

(B) Movement depends on the balance between accumulation and wastage.

Explanation:

A Glacier is accumulation of snow over a particular region over many years. It is balanced by zone of accumulation and zone of wastage. The zone of accumulation is the top of the glacier where the snow or ice accumulates whereas the zone of wastage is the bottom region of the glacier which melts slowly over time. A glacier sustains if the zone of accumulation is greater than the zone of wastage.

Glacial movement is determined by the balance between accumulation and wastage.

Glacial movement is characterized by the balance between accumulation and wastage. The movement of a glacier depends on the amount of snow and ice being added through accumulation compared to the amount being lost through wastage. New snowfall accumulates zone of accumulation at the top of the glacier, while the zone of wastage is at the bottom where ice melts and breaks off. Therefore, the correct option is B. Movement depends on the balance between accumulation and wastage.

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Answer:

Choice A: Light would acquire a blueshift.

Explanation:

When a universe collapses, clusters of stars start to move towards each other. There are two ways to explain why light from these stars will acquire a blueshift.

Stars move toward each other; Frequency increases due to Doppler's Effect.

The time period [tex]t[/tex] of a beam of light is the same as the time between two consecutive peaks. If [tex]\lambda[/tex] is the wavelength of the beam, and both the source and observer are static, the time period [tex]T[/tex] will be the same as the time it takes for light travel the distance of one [tex]\lambda[/tex] (at the speed of light in vacuum, [tex]c[/tex]).

[tex]\displaystyle t = \frac{\lambda}{c}[/tex].

Frequency [tex]f[/tex] is the reciprocal of time period. Therefore

[tex]\displaystyle f = \frac{1}{t} = \frac{c}{\lambda}[/tex].

Light travels in vacuum at a constant speed. However, in a collapsing universe, the star that emit the light keeps moving towards the observer. Let the distance between the star and the observer be [tex]d[/tex] when the star sent the first peak.

The star will emit its second peak after a time of. Meanwhile, the distance between the star and the observer keeps decreasing. Let [tex]v[/tex] be the speed at which the star approaches the observer. The star will travel a distance of [tex]v\cdot t[/tex] before sending the second peak.

The period of the light is [tex]t[/tex] when emitted from the star. However, the period will appear to be shorter than [tex]t[/tex] for the observer. The time period will appear to be:

[tex]\begin{aligned}\displaystyle t' &= t_2 - t_1\\ &= t + \frac{d - v\cdot t}{c} - \frac{d}{c}\\&= t + (\frac{d}{c} - \frac{v\cdot t}{c}) -\frac{d}{c}\\&= t - \frac{v\cdot t}{c} \end{aligned}[/tex].

The apparent time period [tex]t'[/tex] is smaller than the initial time period, [tex]t[/tex]. Again, the frequency of a beam of light is inversely proportional to its period. A smaller time period means a higher frequency. Colors at the high-frequency end of the visible spectrum are blue and violet. The color of the beam of light will shift towards the blue end of the spectrum when observed than when emitted. In other words, a collapsing universe will cause a blueshift on light from distant stars.

The Space Fabric Shrinks; Wavelength decreases as the space is compressed.

When the universe collapses, one possibility is that clusters of stars move towards each other. Alternatively, the space fabric might shrink, which will also bring the clusters toward each other.

It takes time for light from a distant cluster to reach an observer on the ground. The space fabric keeps shrinking while the beam of light makes its way through the space. The wavelength of the beam will shrink at the same rate. The wavelength of the beam of light will be shorter by the time the beam arrives at its destination.

Colors at the short-wavelength end of the visible spectrum are blue and violet. Again, the color of the light will shift towards the blue end of the spectrum. The conclusion will be the same: a collapsing universe will cause a blueshift on light from distant stars.

Answer:

Light would acquire a blueshift.

Explanation:

Just took the test and got it right.

Answer: Question #1) The formation of a precipitate

Question # 2) ? Insufficient information

Question # 3) when you mix baking soda (sodium bicarbonate) with vinegar (acetic acid) the baking soda is the base and the vinegar is the acid, the baking soda takes a proton from the acid and the products of the reaction are H2O and CO2. The initial two products are carbonic acid and sodium acetate and the second part of the reaction is the decomposition reaction with the carbonic acid immediately decomposing into water and carbon dioxide gas. The CO2 rises to the surface creating bubbles.

Question #4) when sodium hydroxide, a strong base reacts with copper sulfate an acidic salt as a blue precipitate of copper hydroxide is produced with ions of sodium sulfate in solution. This represents a double displacement reaction as well as a precipitation reaction.

Explanation:

Answer:

1792 J.

Explanation:

The amount of heat released from Cu = Q = m.c.ΔT.

where, m is the mass of Cu (m = 4.4 g).

c is the specific heat capacity of Cu = 0.385 J/g°C.

ΔT is the temperature difference = (final T - initial T = 1083°C - 25°C = 1058°C).

∴ The amount of heat released from Cu = Q = m.c.ΔT = (4.4 g)(0.385 J/g°C)(1058°C) = 1792 J.

Answer: The answer would be C. Please give me a thanks :) bye!

Explanation:

Answer: C) It provides a lower activation energy for the reaction.

Explanation:

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.

The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.

Answer:

A. the rotational period of the earth is the same as that of the moon

Explanation:

I learned about this last year

The rotational period of the moon is equal to one revolution around the earth,so that the same side of the moon always face earth. Hence the option C is correct.

The rotational period of the moon is equal to one revolution around the earth,so that the same side of the moon always face earth. Hence the option C is correct.

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At STP,

22.4litre Oxygen=32 g of oxygen

so 1 litre oxygen=32/22.4=1.42 g of oxygen

hence 5.63 litre oxygen=1.42×5.63=7.99 g of oxygen

Answer:

Explanation:

Deal with 1 mole first.

The chemical formula of Magnesium Phosphate is

Mg3(PO4)2

The 2 tells you that there are 2 mols of Phosphorus in the chemical.

1 mol of anything is 6.02 * 10^23 (in this case) atoms.

2 mols of anything is 12.04 * 10^23 atoms

2 moles of anything is 1.204 * 10^24 (the 2 answers are the same. This one is more correct in scientific notation.)

Now we come to the 5.01. Where does that go?

5.01 * Mg3(PO4)2

So multiply 1.204 * 10^24 by 5.01 When you do, you get

7.26 * 10^24 atoms

Answer:  Atoms want to be like a "noble gas" with a filled outer shell. I think it has to do with being in a stable state. For Mg, it's a lot easier to drop 2 electons to look like Ne rather than gain 6 to look like Argon.  

therefore ,by electric configuration we get

As the no. of atoms is less than 5 it is easy to lose from gaining as it took some more difficulties!!!

hope its help!!✌✌✌✌✌

safety goggles

root vegetable, such as a large carrot or potato

two metal forks

an edge or thin wall to freely balance the vegetable on, such as a cardboard box with its flaps taped down

Stay safe! Always wear your safety goggles. Be careful while sticking the forks into the vegetable. If you’re working outside a lab, make sure the area is clean so you can save the vegetable when you’re done.

Part A

Stick a fork into each end of

Answer:

120.7 g.

Explanation:

Molarity is defined as the no. of moles of a solute per 1.0 L of the solution.

M = (no. of moles of solute)/(V of the solution (L)).

∴ M = (mass/molar mass)of NaCl/(V of the solution (L)).

∴ mass of CaCl₂ = (M)(V of the solution (L))(molar mass) = (1.5 M)(0.725 L)(110.98 g/mol) = 120.7 g.

Answer:

i think it's B, C and D

Explanation:

Answer:

A substance only with one type of atom

Explanation:

took test

Answer:

a. Earth casts a shadow on the moon.    

Explanation:

Lunar eclipse occurs when Earth comes in between sun and moon. The sunlight falling on moon is blocked by Earth and the shadow of earth falls on moon. This happens on full moon day when sun, earth and moon align in one line.The moon passes through the shadow of earth and appears dark.

Thus, the correct option is a.

Answer:

a

Explanation:

Answer:

1. Sexual reproduction always requires two parents.

3. Asexual reproduction requires only one parent.

Explanation:

The statement which clearly distinguish two types of reproduction is option 1. Sexual reproduction always require two parents whereas, asexual reproduction.

Asexual reproduction refers to a type of reproduction where a child is born to a single parent. The newly created people are clones of their parents since they have the same genetic makeup and physical characteristics.

Both multicellular and unicellular species can reproduce asexually. There will be no gamete fusion involved in this procedure, and the number of chromosomes will remain the same.

Sexual reproduction always requires two parents. The genetic traits from both parents are inherited to the offsprings. However , not all of them can be active traits some goes hidden. Hence, option 1 is correct.

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The properties of copper conducting heat well and the sweet odor of alcohol are both physical properties. They describe the state of a physical system and do not indicate a change in the chemical composition of the substances.

These properties you referred to are known as Physical Properties. A physical property is any property that is measurable whose value describes a state of a physical system.

The property of copper conducting heat well is a physical property. Metallic copper is highly conductive and allows for the fast transfer of thermal energy, which is a physical change, not a chemical one. It simply changes the temperature, not the chemical structure of the copper.

Similarily, the sweet odor of alcohol is also a physical property, distinct to specific alcohols, for instance, Ethanol. The odor or smell does not alter or define the chemical composition of the alcohol, thus it is not a chemical property.

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Answer:

A. It measures the [products] / [reactants].

Explanation:

So, the right choice answer:

A. It measures the [products] / [reactants].

Answer:

B)

Explanation:

Mutations are changing in chromosomes.

Answer:

The correct answer is B: reaction A is endothermic and reaction B is exothermic.

Explanation:

A: 6CO2(g) + 6H2O(l) + sunlight → C6H12O6(aq) + 6O2(g): is the photosynthesis reaction. Photosynthesis is an endothermic reaction, therefore it needs energy (sunlight) to take place.

B: 2H2(g) + O2(g) → 2H2O(g) + energy: is the formation of water. It is an exothermic reaction which releases energy as a result of the reaction.

So, the answer is option (B): Reaction A is Endothermic and Reaction B is Exothermic.

Answer: Answer: B. Reaction A is endothermic, and reaction B is exothermic

Explanation:

Endothermic  reaction  is a reaction that absorb energy   from  its surrounding.

Reaction A :  6H2O(l) + sunlight

Exothermic reaction  is  a reaction that releases energy  to the surrounding.

Reaction B    → 2H2O(g) + energy

Answer:

low I.E., high I.E

Explanation:

Ionic or electrovalent bonds are interatomic bonds that results from the transfer of electrons between atoms. It is usually between a metal, electron donor, and non-metals which accepts electrons readily.

For an ionic bond to be formed, a large electronegativity difference is required. This suggests that one atom has a large electronegativity value while the other, the donating atom, has a low value of electronegativity. Electronegativity of an element is a property that combines the ability of its atom to lose or gain electrons. So, with respect to electronegativity, atom X would have a low electronegativity value and Y, a very high electronegativity value.

Ionization Energy(I. E) is the readiness of an atom to lose an electron. Most metals have low I.E values and would readily want to lose electrons. This satisfies X. Y in an ionic bond would have a very high I.E value and would not readily want to lose electrons but gain electrons. Y is a non-metal to a large extent.

Answer:

Low I.E of atom X and high I.E of atom Y.

Explanation:

An ionic bond is formed when two ions are formed.

In ionic bond an atom loses electron and the electron is accepted by another atom. The atom losing electron acquires positive charge and the atom gaining electron acquires negative charge.

Now to lose an electron the atom should have low ionization energy (I.E.) and the other atom must not lose electron easily (high I.E.) and should have high electron affinity.

The correct answer is A I believe!

the correct answer is d)

Answer: A. Refrigerator technology has helped improve people’s nutrition.

Explanation:

Refrigeration technology has been transformative for society by enhancing food preservation, enabling long-distance transportation of fresh produce, and thereby improving overall nutrition and food variety available to people. Correct option is A.

Refrigerator technology has significantly changed society by improving how we store, transport, and consume food. With the advent of refrigeration technology, we're able to preserve the quality and nutritional value of food over longer periods and distances, helping to improve global nutrition levels. It's worth noting that refrigeration technology has also led to a greater variety of food being available to consumers, as produce can now be shipped safely across the world, and stored efficiently for later use.

The correct answer to the question of how refrigerator technology has changed society is A. Refrigerator technology has helped improve people’s nutrition.

The answer is Solar, Wind, Geothermal, Hydrogen, Tidal, Wave, Hydroelectric, Biomass Energy.

Final answer:

The seven sources of energy are food, geothermal energy, tidal energy, solar energy, biomass energy, fossil fuels, and nuclear energy.

Explanation:

Sources of Energy

Food: In living organisms, the source of energy is the food they consume.

Geothermal energy: This energy comes from the earth's core.

Tidal energy: Generated by the gravitational pull of the moon and sun.

Solar energy: Produced by the sun's light and is responsible for wind, the water cycle, and photosynthesis.

Biomass energy: Created by plants, algae, and cyanobacteria utilizing solar energy through photosynthesis. Biomass can be burned for biofuels.

Fossil fuels: Formed from ancient biomass over millions of years. Includes coal, oil, and natural gas.

Nuclear energy: Generated through nuclear reactions, such as those in the sun and nuclear power plants.

Answer:

= 498.13 mmHg

Explanation:

Using the combined gas law;

P1V1/T1 =P2V2/T2

in this case; P1 = 725 mmHg, V1 = 375 mL and T1 = 25°C + 273 = 298 K

P2 = ?  V2 = 500 mL and T2 = 0°C + 273 = 273 K

P2 = P1V1T2/T1V2

     = (725 × 375 × 273)/(298 × 500)

     = 498.13 mmHg

Answer:

Qustion 7:

Answer is → "c. Calcium ions and sulfate ions join together to form an insoluble compound"

Question 8:

Answer is → b. ²³⁹Pa

Question 9:

Answer is → "c. 1/3 the pressure in container B"

Explanation:

=================================================================

Qustion 7:

from the graph:

a. precipitation reactions only occur when solution temperature are decreased.

this option is wrong due to precipitation reaction can occur at room temperature or even at elevated temperature.

b. Sodium ions and chloride ions repel each other when they are in a solution.

Also, this is a wrong statement because sodium ions is positively charged and attract the negatively charged chloride ions.

d. the creation of precipitate adds mass that was previously non-existent.

From graph it is clear that the mass doesn't changed before and after the reaction remain constant (=300.23 g).

So, the right answer is

→ "c. Calcium ions and sulfate ions join together to form an insoluble compound"

=================================================================

Question 8:

According to the equation :

So, the right answer is

→ b. ²³⁹Pa

=================================================================

Question 9:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

If n and T are constant, and have two different values of P and V:

Pₐ * Vₐ= P(b) *V(b)

from the graph:

Vₐ= 9.0 L.

V(b)= 3.0 L.

∴ Pₐ = [P(b) * V(b)] / Vₐ = [P(b) * 3.0 L] / 9.0 L = 1/3 P(b).

So, the right choice is:

Answer is → "c. 1/3 the pressure in container B"

=================================================================

Answer:

1.95

Explanation:

Just did the test and it was correct!

Answer: The correct answer is 1.95 M

Explanation:

To calculate the concentration of acid, we use the equation given by neutralization reaction:

[tex]n_1M_1V_1=n_2M_2V_2[/tex]

where,

[tex]n_1,M_1\text{ and }V_1[/tex] are the n-factor, molarity and volume of unknown acid which is HCl.

[tex]n_2,M_2\text{ and }V_2[/tex] are the n-factor, molarity and volume of base which is [tex]Ca(OH)_2[/tex]

We are given:

[tex]n_1=1\\M_1=?M\\V_1=(45.5-0.0)=45.5mL\\n_2=2\\M_2=1.2M\\V_2=(37.5-0.5)=37mL[/tex]

Putting values in above equation, we get:

[tex]1\times M_1\times 45.5=2\times 1.2\times 37\\\\M_1=1.95M[/tex]

Hence, the concentration of unknown HCl solution comes out to be 1.95 M.

Are there any choices to your question? If so what are they? Then I can answer. :)

Answer:

True

Explanation:

This is true!

Answer:

true

Precipitation (or the lack of) is the main factor that defines Arid climate. To have an Arid climate, an area must receive less than 10 inches of rain per year. However, many areas of arid climate receive far less than that. Some deserts around the world don't receive 10 inches of rain in 10 years!

Answer:

Explanation:

1.75atm x 101.3kPa/1 atm

=177kPa

1.75 atm x 760 mmHg/1 atm

=1300 mm Hg

The study of chemicals and bonds is called chemistry. There are different types of elements and these are metals and nonmetals.

The correct answer is 1300mmhg

According to the question, the formula is used as  

[tex]1.75* 101.3[/tex] =177kPa

1.75 * 760=1300 mm Hg

Hence, the correct answer is 1300mmhg.

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