Determine the volume of a helium balloon given the balloon was filled from a container 0.15L of gas at 2 atm if the new pressure is 0.97 atm. Assume constant temperature.

Answer:  C is right

Explanation:  One mole is 6.022 x 10^23 molecules.

Dividing 3.25188 x 10^24 / 6.022 x 10^23 = 5.4 moles

It is thought that global dimming is probably due to the increased presence of aerosol particles in Earth's atmosphere, caused by pollution, dust, or volcanic eruptions. Aerosols and other particulates absorb solar energy and reflect sunlight back into space. ... Water droplets in clouds coalesce around the particles.

Global Dimming

source:

wikipedia via gooogle snippet

HCl and CaCl2

I took the test and it wright

The correct pair that lists a substance that can neutralize [tex]\rm Ca(OH)_2[/tex] and the salt that would be produced from the reaction is HCl and [tex]\rm CaCl_2[/tex].

A reaction is a process that involves the transformation of one or more substances into one or more different substances.

When HCl (hydrochloric acid) reacts with [tex]\rm Ca(OH)_2[/tex] (calcium hydroxide), they undergo a neutralization reaction. The HCl donates a hydrogen ion ([tex]\rm H^+[/tex]) to the  [tex]\rm Ca(OH)_2[/tex], resulting in the formation of water ([tex]\rm H_2O[/tex]) and [tex]\rm CaCl_2[/tex] (calcium chloride).

The reaction can be represented as follows:

[tex]\rm 2HCl + Ca(OH)_2\rightarrow 2H_2O + CaCl_2[/tex]

Therefore, HCl is an acid that can neutralize [tex]\rm Ca(OH)_2[/tex] and the salt produced from this reaction is  [tex]\rm CaCl_2[/tex].

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Answer:

b

Explanation:

Deuterium is the products of a hydrogen fusion reaction, the correct option is A.

It is the situation in which two hydrogen atoms merge or coalesce to form a helium atom.

A portion of the hydrogen's mass is transformed into energy during the process.

The fusion reaction that abilities the Sun and stars occurs when hydrogen atoms merge to produce deuterium, and then deuterium and hydrogen atoms fuse to form helium, releasing energy.

Four Hydrogen nuclei (protons) combine to form a Helium nucleus in the basic Hydrogen fusion cycle.  

Actually, electrons, neutrinos, and photons are involved in the hydrogen fusion into helium.

Since the total mass of the eventually results single nucleus is lower than the mass of the original two nuclei, the process releases energy.

Thus, the correct option for the given case is A.

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electrons

protons

atom

compounds

mixtures

Answer:

Freeze-thaw

Explanation:

Water expands slightly when it freezes to form ice. This is why water pipes sometimes burst in the winter. You might have seen a demonstration of this sort of thing - a jar filled to the brim with water eventually shatters after it is put into a freezer. The formation of ice can also break rocks.

The standard reduction potential for the half-reaction Zn²⁺(aq) + ⁻2e → Zn(s) is -0.76 V; option A

The standard reduction potential of a chemical species is the a measure of the potential of a given chemical species to be reduced rather than being oxidized.

This measurement is done under standard conditions of concentration, pressure and temperature.

The standard reduction potential for the half-reaction Zn²⁺(aq) + ⁻2e → Zn(s) is -0.76 V.

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Answer:

It is a weak base.

Explanation:

A base is a substance that releases hydroxide ion (OH-) when in an aqueous solution, according to Svante Arrhenius definition of a base. However, a base is said to be either strong or weak depending on it is able to dissociate.

A weak base is a base that does not completely dissociate into hydroxide ions in an aqueous solution while a strong base dissociates completely. According to this question, 32% of a basic substance ( because it can dissociate into OH-) dissociates to release hydroxide ions. This means that since it does not totally dissociate i.e. 100%, it is a WEAK BASE.

Answer:

It is a weak base.

Explanation:

Guy above me is right and I took the test :)

Answer:

2.39×10¯⁵ m²

Explanation:

From the question given above, the following data were obtained:

Distance (d) = 8.08×10¯⁵ m

Charge (q) = 2.24×10¯⁹ C

Potential difference = 855 V

Area(A) =?

NOTE: Permittivity (ε₀) = 8.854×10¯¹² F/m

The area can be obtained as follow:

q = ε₀AV/d

2.24×10¯⁹ = 8.854×10¯¹² × A × 855 / 8.08×10¯⁵

2.24×10¯⁹ = 7.57×10¯⁹ × A / 8.08×10¯⁵

Cross multiply

7.75×10¯⁹ × A = 2.24×10¯⁹ × 8.08×10¯⁵

7.75×10¯⁹ × A = 1.81×10¯¹³

Divide both side by 7.75×10¯⁹

A = 1.81×10¯¹³ / 7.75×10¯⁹

A = 2.39×10¯⁵ m²

Thus, the area of the plate is 2.34×10¯⁵ m²

Answer:

2.39

Explanation:

Answer:

the volume of the sound will quarter

Explanation:

As you move far away from the source, the loudness of sound decreases. This is because as the distance from the source increases, the area it covers also increases thereby spreading the energy over a great area leading to lesser loudness and intensity.

As a result of this, sound intensity follows an inverse square law:

I ∝ 1/d²; where I is the intensity and d is the distance from source.

Therefore If a speaker is moved from 2 feet away to 4 feet away (increment of 2 feet), the volume of the sound would quarter (1/2² = 1/4)

Answer:

chlorine is larger so the symbol is <

Explanation:

Answer:

sugar, salt, oxygen

Explanation:

hope these work

Answer:

Examples of solutes include sugar, salt, oxygen, etc. There are numerous examples of solutions. For example, milk (solvent) and sugar (solute) make sweet milk. Air is made up of gases (oxygen, nitrogen, carbon dioxide, etc.).

Explanation:

Answer:

The element that has 16 electrons, 16 protons, and 16 neutrons is sulfur (S)

Explanation:

The atomic number tell you the number of protons.

The atomic configuration tell you the number of electrons.

The mass number minus the protons tell you the number of neutrons.

Answer:

first one is yes, second one is no

Explanation:

edge

Answer: B

Explanation:

According to Ohm's Law, the answer is B.

Ohm's Law states that power is equal to volume x current.

If volume x current equals power, that means they are both 50% of power.

Ohm's Law:

power = voltage x current

current = voltage x power

voltage = power x current

I hope this answer helped.

Power is always half the amount of voltage. Hence, option B is correct.

Voltage is the potential difference between two points in a circuit or the electromotive force in a given circuit and is expressed in volts (V).

Voltage is measured by a device called a voltmeter that is always connected in parallel with the current source.

When voltage is measured between two points on a wire in a circuit with zero or no resistance in between the two points then the voltage will be zero.

From the ohm's Law, voltage is given the product of resistance and current and thus if the resistance is zero then the voltage will be zero.

Ohm's Law states that power is equal to volume x current.

If volume x current equals power, that means they are both 50% of power.

Ohm's Law:

power = voltage x current

current = voltage x power

voltage = power x current

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**Check for proof photos at the bottom.**

Use the table to compare the solubilities of substances. Check all of the boxes that apply.

A. Aspirin is less soluble than table salt, but more soluble than carbon dioxide.

C. A saturated solution of table sugar is more concentrated than a saturated solution of table salt.

The solubility of glucose at 30°C is  125 g/100 g water. Classify a solution made by adding 550 g of glucose to 400 mL of water at 30°C. Explain your classification, and describe how you could increase the amount of glucose in the solution without adding more glucose.

Answer: The solution is saturated. At 30°C, 500 g of glucose will dissolve in 400 mL of solution. Of the 550 g glucose added, only 500 g will dissolve and 50 g will precipitate out. The amount of glucose in the solution can be increased by heating the solution because the solubility of solids tends to increase with temperature.

Use the graph to identify the number, letter, or word that completes each statement.  

•      The solubility of Solute D  decreases  as temperature increases.

•      The solubility of Solute E  increases the most as temperature increases.

•      The solubility of Solutes C and D is the same at  20°C.

•      As the temperature increases from 0 to 100, the solubility only changes by about  5 grams for Solute B.

In the provided table shows the solubility of 4 different substances. The solubility number for Aspirin is smaller than the number for table salt, but larger than the number for carbon dioxide. Since the solubility if sugar is larger than table salt, its saturated concentration would be higher.

In the given chart, the line representing solubility of solute D decreases as temperature increases. The line for solute E increases the most. At 20°C, the lines of C and D are about the same height.

Here are photos of Edge just incase.

Answer:

A & C

Explanation:

Answer:

Explanation:

The pH of a solution can be found by using the formula

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

From the question we have

[tex]ph = - log(1.8 \times {10}^{ - 5} ) \\ = 4.7447[/tex]

We have the final answer as

Hope this helps you

Answer:

see your answer in pic

Explanation:

There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore, the nuclear equation for the beta decay of Promethium-165 is

¹⁶⁵Pm[tex]\rightarrow[/tex]⁰e₋₁  +  ₆₂Sm¹⁶⁵

Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle. The kinetics that is related to nuclear decay is of first order.

The nuclear equation for the beta decay of Promethium-165 is

¹⁶⁵Pm[tex]\rightarrow[/tex]⁰e₋₁  +  ₆₂Sm¹⁶⁵

Beta decay of  Promethium-165 is the emission of electron particle from the given isotope. the product is Samarium  ₆₂Sm¹⁶⁵.

Therefore, the nuclear equation for the beta decay of Promethium-165 is

¹⁶⁵Pm[tex]\rightarrow[/tex]⁰e₋₁  +  ₆₂Sm¹⁶⁵

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Answer:

4 moles of aluminum and 6 moles of oxygen are produced

Answer:

option no. C is correct

an electron in the 3d

Explanation:

moles = mass/mr

=60.3/28

=2.15 moles

number of particles = moles × 6.02×10^23

= 2.15×6.02×10^23

= 1.29×10^24 atoms

CO=12+16=28

Answer:

The complementary sequence of bases in the complementary strand of the given single DNA strand AACTCTGCCAT will be:

TTGAGACGGTA

Explanation:

The primary structure of DNA is a double-stranded helix of nucleotides linked to each other by phosphodiester linkages. The two strands of the DNA molecule is complementary to each other. While one strand is linked in the 3' to 5' direction, the other strand is linked in the 5' to 3' direction. The two strands are held together by hydrogen bonds between the nucleotides of the two strands and this is known as base pairing. In base pairing, adenine nucleotide, A, on one strand forms two hydrogen bonds with thymine nucleotdie, T, in the other strand. Also, guanine nucleotide, G, in one strand, forms three hydrogen bonds with cytidine nucleotide, C, in the complementary strand.

Therefore, once the nucleotide sequence of one DNA strand is known, the nucleotide sequence of the complementary strand can easily be deduced.

The complementary sequence of bases in the complementary strand of the given single DNA strand AACTCTGCCAT will be: TTGAGACGGTA

Answer: 0.5 moles of [tex]N_2[/tex] are produced in the reaction

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)

Given mass of [tex]CuO[/tex] = 113.6 g

Molar mass of [tex]CuO[/tex] = 79.5 g/mol

Plugging values in equation 1:

[tex]\text{Moles of CuO}=\frac{113.6g}{79.5g/mol}=1.43 mol[/tex]

For the given chemical reaction:

[tex]2NH_3+3CuO\rightarrow 3Cu+N_2+3H_2O[/tex]

By the stoichiometry of the reaction:

If 3 moles of [tex]CuO[/tex] produces 1 mole of [tex]N_2[/tex]

So, 1.43 moles of [tex]CuO[/tex] will produce = [tex]\frac{1}{3}\times 1.43=0.476=0.5mol[/tex] of [tex]N_2[/tex]

Hence, 0.5 moles of [tex]N_2[/tex] are produced in the reaction

The question is incomplete, the complete question is:

If a 6.00 g sample of an optically pure compound was dissolved in 40.0 mL of [tex]CCl_4[/tex] and the observed rotation was +3.30°, measured in a 10.0 cm (1.00 dm) polarimeter tube, how would one determine the specific rotation of the pure compound?

Answer: The specific rotation of the pure compound is [tex]+22^o[/tex]

Explanation:

To calculate the specific rotation of a pure compound, we use the equation:

[tex][\alpha]=\frac{\alpha_{\text{observed}}}{C\times l\text{( in dm)}}[/tex]

where,

[tex][\alpha][/tex] = specific rotation of a pure compound

[tex]\alpha_{\text{observed}}[/tex] = observed rotation of the compound = [ex]+3.30^o[/tex]

C = concentration in g/mL = 6.00 g/40 mL = 0.15 g/mL

l = path length = 1.00 dm

Putting values in above equation, we get:

[tex][\alpha]=\frac{+3.30^o}{0.15\times 1.0}[/tex]

[tex][\alpha]=+22^o[/tex]

Hence, the specific rotation of the pure compound is [tex]+22^o[/tex]

Answer

(:

Weight is basically  a measure of theme  force of gravity pulling down on an object. It depends on the object's mass and the acceleration due to gravity, which is 9.8 m/s2 on Earth. The formula for calculating weight is F = m × 9.8 m/s2, where F is the object's weight in Newtons (N) and m is the object's mass in kilograms.

Explanation:

Answer:

The Percentage concentration of acetic acid = 1.39 %

Explanation:

Density of acetic acid solution = 1.05 g/mL

Volume of acetic acid solution = 0.1 L = 100 mL

From the formula, Density = mass / volume; mass = density × volume

Mass of acetic acid solution = 1.05 g/mL × 100 mL = 105 g

Molar concentration of acetic acid solution = 0.243 mol/L

Molar mass of acetic acid, CH₃COOH = (12 × 2 + 1 ×4 + 16 ×2) = 60 g/mol

From the formula, mass concentration = molar concentration × molar mass

Mass concentration of acetic acid, CH₃COOH = 0.243 mol/L × 60 g/mol = 14.58 g/L

In one liter of acetic acid solution, there are 14.58 g of acetic acid. Therefore, in 0.1 L, there will be 14.58 × 0.1 = 1.458 g of acetic acid.

Percentage concentration of acetic acid = mass of acetic acid / mass of acetic acid solution × 100%

Percentage concentration of acetic acid = (1.458 / 105) × 100% = 1.39 %

The Percentage concentration of acetic acid = 1.39 %

Answer:

A volumetric pipette is used to measure 25.0cm3 of 2.0mol/dm3 aqueous sodium hydroxide into aconical flask.

A burette is filled with dilute sulfuric acid.

Write a balanced symbol equation for the reaction between these chemicals when we neutralise.

Explanation:

The reactants of the given reaction are:

sodium hydroxide and dilute sulfuric acid.

The balanced chemical equation of the reaction is:

[tex]H_{2}SO_{4} (aq) + 2NaOH(aq) -> Na_{2} SO_{4} (aq)+ 2H_{2} O(l)[/tex]

Acid and base raect with each other and form salt and water.

This reaction is called a neutralization reaction.

Explanation:

measuring the change of temperature when 2 liquids are mixed

Explanation:

The number acquired by an element after the lose or gain of an electron is called oxidation number.

For example, [tex]4Fe(s) + 3O_{2}(g) \rightarrow 2Fe_{2}O_{3}(s)[/tex]

Here, oxidation number of Fe(s) is 0 and Fe in [tex]Fe_{2}O_{3}[/tex] is +3.

Oxidation number of O in [tex]O_{2}(g)[/tex] is 0 as it is present in its elemental state.

The oxidation number of O in [tex]Fe_{2}O_{3}[/tex] is calculated as follows.

[tex]2(3) + 3x = 0\\6 + 3x = 0\\x = \frac{-6}{3}\\= -2[/tex]

Hence,  oxidation number of O in [tex]Fe_{2}O_{3}[/tex] is -2.