Prior to science lab, Maria had been drinking a can of soda. When she walked into the lab she set it down on the hot plate at her station. She heard a liquid beginning to boil, and realized that the previous students had forgotten to turn off the hotplate and the boiling noise was from the remaining soda in the can. Without thinking, she picked up the can with her bare hands, and put it upside down into the sink which was half full of liquid. Immediately the can crushed as though it was going to be recycled. What do you think is happening to the soda and air in the can? Support you claim in Question 4, by explaining why you think it is happening. Formulate your hypothesis for the problem. Critique Maria’s laboratory safety procedures.

The number of tires contained by 2.5 moles of cars is 10 tires.

The number of moles of a substance equals the ratio of its given mass in a chemical reaction to the mass of one mole of that substance.

The number of tires contained by 2.5 moles of cars is calculated as follows;

1 moles of a car contains 4 tires

2.5 moles of cars will contain -------?

Substitute the given parameters and solve for the number of tires contained in 2.5 moles of cars.

= 2.5 moles x 4 tires/1 mole

= 10 tires

Thus, the number of tires contained by 2.5 moles of cars is 10 tires.

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Answer:

b) Li2S(aq)+Pb(NO3)2(aq)

e) K2S(aq)+Sn(NO3)4(aq)

Explanation:

they are the only two of the options that contain a sulfide ion (S) therefore they are the only ones that could be considered in the question.

b) Li2S(aq)+Pb(NO3)2(aq)

e) K2S(aq)+Sn(NO3)4(aq)

Answer:

2s2 2p5

Rb < Sr< Sn< Te<I

Explanation:

Electron affinity is the ability of an atom to accept electrons to form negative ions.

Electron affinity is a periodic trend that decreases down the group but increases across the period.

This accounts for the trends observed in the answer. The atom having the electronic configuration, 2s2 2p5 must be a halogen and it exhibits the highest value of electron affinity.

Also, since electron affinity increases across the period, the electron affinities of the elements increases. Therefore, the arrangement of atoms as shown in the answer depends on increasing electron affinity.

The balanced equation is 4NH₃ + 6N0 ---- 5N₂ + 6H₂O . The chemical reaction is balanced by hit and trail method  for ammonia reaction with nitric oxide .

A chemical reaction is the chemical transformation of one set of chemical components into another. Chemical reactions are often defined as changes that only affect the locations of electrons in the formation and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can frequently be described using a chemical equation. Nuclear chemistry is a branch of chemistry that studies the chemical reactions of unstable and radioactive materials, which can result in both electronic and nuclear alterations.

The substance (or substances) that initiate a chemical reaction are known as reactants or reagents. Chemical reactions are often characterized by a chemical change and the formation of one or more products with features distinct from the original.

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Answer:

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Questions & Answers

CBSE

Chemistry

Grade 11

The Gaseous State

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Answer

What volume will a gas occupy at 740mm pressure which at 1480 mm occupies 500 cc? Temperaturebeingconstant.

Last updated date: 30th Dec 2022

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Hint: Boyle in the mid 1600’s observed that the product of the pressure and volume of a gas are observed to be nearly constant provided that the temperature is kept constant. This is always true in the case of an ideal gas.

P×V=constant

This relationship between pressure and volume of an ideal gas is known as the Boyle's Law.

Complete answer:

Since it is given in the question that temperature can be assumed as constant, we can apply Boyle’s Law.

According to Boyle's Law we know that:

⇒P×V=constant

We can rewrite this as

⇒P1×V1=P2×V2

Where P1 is the pressure at the volume V1

P2 is the pressure at the volume V2

Thus from the given question we can say that:

P1 = 1480 mm

V1 = 500 cc

P2 = 740 mm

V2 = x

Thus we can rewrite the equation and substitute the above values and obtain the equation given below:

⇒V2=P1×V1P2

⇒V2=1480×500740

⇒V2=1000cc

Thus the volume of gas occupied at a pressure of 740 mm is 1000 cc.

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

The mass, in grams, of NaCl needed to use to make the solution is 1.76grams.

The mass of a substance can be calculated by multiplying the number of moles by its molar mass.

However, the number of moles must first be calculated by using the following expression:

Molarity = no. of moles ÷ volume

no. of moles = 0.249 × 0.1208

no. of moles = 0.03moles

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

mass of NaCl = 0.03 × 58.5 = 1.76g

Therefore, the mass, in grams, of NaCl needed to use to make the solution is 1.76grams.

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The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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Steel is produced from pig iron through a process known as steelmaking or iron and steel production.

The pig iron obtained from the blast furnace contains high amounts of carbon, impurities, and other elements. To convert pig iron into steel, the carbon content needs to be reduced to desired levels, and impurities must be removed.One common method of steelmaking is the basic oxygen process (BOP). In this process, pig iron is placed in a vessel called a converter, where oxygen is blown through the molten metal. The oxygen reacts with the carbon and impurities, causing them to oxidize and form gases that are released. Alloying elements and desired additives can be added at this stage to achieve specific steel properties. Another method is the electric arc furnace (EAF), where an electric arc is used to heat and melt the pig iron, allowing impurities to be oxidized and removed.The advantages of using steel are numerous. Steel is strong, durable, and versatile, making it suitable for a wide range of applications. It has high tensile strength, which means it can withstand heavy loads and pressures. Steel is also resistant to corrosion, making it ideal for construction, infrastructure, and transportation projects. It is a recyclable material, contributing to sustainability and reducing environmental impact. Additionally, steel can be fabricated into various shapes and sizes, allowing for customization and flexibility in design.References:

A. Ghosh and A. Chatterjee, Ironmaking and Steelmaking: Theory and Practice, PHI Learning, 2008.

R.H. Tupkary and V.R. Tupkary, An Introduction to Modern Iron Making, Khanna Publishers, 2010.

J.R. Davis, ed., ASM Specialty Handbook: Carbon and Alloy Steels, ASM International, 1995.

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The mass of \(\rm HClO_3\) Produced in the reaction has been given by the stoichiometric laws. The mass-produced in the reaction has been 141.03 grams.

The stoichiometric law has been the moles produced in the reaction and the reacted equivalent to the stoichiometric coefficient.

The mass of water in the reaction has been given as:

\(\rm Density=\dfrac{Mass}{Volume}\\ 0.998\;g/mol=\dfrac{Mass}{18\;ml}\\ Mass=17.964\;grams\)

The molar mass of water has been 18 grams/mol. Thus, 17.964 grams of water has been equivalent to 1 mol.

From the balanced chemical equation, the moles of \(\rm HClO_3\) Produced has been given as:

\(\rm 3\;mol\;H_2O=5\;mol\;HClO_3\\1\;mol\;H_2O=\dfrac{5}{3}\;\times\;1\;mol\;HClO_3\\ 1\;mol\;H_2O=1.67\;mol\;HClO_3\)

The moles produced has been 1.67 mol. The molar mass of the compound is 84.45 g/mol

The mass can be given as:

\(\rm Mass=Moles\;\times\;Molar\;mass\\Mass\;HClO_3=1.67\;\times\;84.45\;grams\\Mass\;HClO_3=141.03\;grams\)

The  mass of \(\rm HClO_3\) Produced in the reaction is 141.03 grams.

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Nature has provided us numerous gifts such as air, water, land, sunlight, minerals, plants, and animals. All these gifts of nature make our earth a place worth living. Existence on Earth would not be possible without any of these. Now, while these natural resources are present on Earth in plenty. Unfortunately, the necessity of most of these has increased extremely over the centuries due to growth in the human population.

To preserve nature in your day-to-day life:

Reduce waste: Avoid single-use items and recycle materials like paper, plastic, glass, and metal.

Conserve water: Use water wisely, fix leaks, and consider collecting rainwater.

Save energy: Opt for energy-efficient appliances and turn off lights and electronics when not in use.

This is only the tip of the iceberg. You could also help in massive projects to rid the ocean of all waste (I'm talking about TheOceanCleanup, search it up), or do something more small, like helping out in your local community.

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~~~Harsha~~~

When sodium hydroxide is dissolved in water within a beaker, it is observed that the beaker becomes warm due to chemical reaction.

A chemical reaction is a type of reaction that involves the rearrangement of atoms to form new substances.

The indications that a chemical reaction has occurred is:

Therefore, When sodium hydroxide is dissolved in water within a beaker, it is observed that the beaker becomes warm due to chemical reaction.

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The molar mass of unknown gas is - 16 g/mole

To calculate the rate of diffusion of gas is , we use Graham's law.

This law states that the rate of diffusion is inversely proportional to the square root of of the molar mass of the gas. The equation of the law is :

Rate of diffusion \(\alpha\)  \(\frac{1}{ \sqrt{ Molar mass of the gas} }\)

Given that,

\(Rate_{unknown gas}\)  = 1.65 ×\(Rate_{C_{3}H_{8} }\)

we know that,

Molar mass of the propane = 44 g/mole

Take the ratio of rate of diffusion of gases, we get:

\(\frac{Rate_{( unknown gas)} }{Rate_{C_{3} H_{8} } }\)  =  \(\sqrt{} \frac{MC_{3}H _{8} }{ M_{(unknown gas)} }\)

Putting values in above equation, we get:

    \(\frac{1.65 * Rate_{C_{3} H_{8} } }{ Rate_{C_{3} H_{8} }}\)     =   \(\sqrt{\frac{44}{ M_{(unknown gas} } }\)

⇒    1.65    =  \(\sqrt{\frac{44}{M_{(unknown gas} } } }\)

⇒    \(1.65^{2}\)    =    \(\frac{44}{M_{(unknown gas)} }\)

⇒  \(M_{(unknown gas)}\) = \(\frac{44}{2.7225}\)

⇒  \(M_{(unknown gas)}\) = 16.1616  

\(M_{(unknown gas)}\)  = 16

Hence, the molar mass of unknown gas is - 16 g/mole.

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Protium, an isotope of hydrogen, contains the hydrogen atom (H1). An interstellar cloud called the H I region.

Community of British NVC H1, an area of health. An isotope of hydrogen, the hydrogen atom (H1) protium, is present. In the interstellar medium, a cloud called the H I zone. CTA code H01 Anatomical Therapeutic Chemical Classification System subclass: Pituitary and hypothalamic hormones and analogues.

Water and organic compounds are two examples of molecules that contain the majority of the hydrogen that exists on Earth. One proton, one electron, and no neutrons are present in each atom of the most prevalent isotope of hydrogen (symbol 1H).

It is officially referred to as protium because this isotope's nucleus only contains one proton. Hydrogen-1 is regarded as a stable isotope because the proton's decay has never been detected.

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Answer:

The correct answer is: Sweden

I just submitted my test with this question on it and it said the right answer was Sweden. When you look at the graphs the one with the most dark blue has the most supporters. Sweden has the most dark blue.

Hope this is helpful, please mark me Brainliest if i got it right :)

Explanation:

A leather jacket and printer paper are examples of items that can be made from renewable resources, while plastic forks, metal cans, and electronics are not considered renewable due to their reliance on non-renewable materials and processes. Option  C, E

The two correct answers that are made from renewable resources are:

C) Leather jacket: Leather is derived from animal hides, which are a byproduct of the meat industry. As long as there is a sustainable and responsible approach to animal farming, the production of leather can be considered renewable. The hides are obtained from animals that are raised for meat consumption, and their use in leather production helps reduce waste.

E) Printer paper: Printer paper can be made from various sources, including trees, bamboo, and recycled paper fibers. If the paper is sourced from sustainably managed forests or from fast-growing plants like bamboo, it can be considered renewable. Additionally, the use of recycled paper fibers reduces the demand for materials and promotes a more circular economy.

The other options, A) plastic fork, B) metal can, and D) electronics, are not made from renewable resources:

A) Plastic fork: Plastics are typically derived from fossil fuels, which are non-renewable resources. The production of plastic involves the extraction and processing of petroleum or natural gas, both of which are finite resources.

B) Metal can: Metal cans are predominantly made from aluminum or steel. While these metals can be recycled, their initial production requires the extraction of raw materials from the Earth, which is not a renewable process.

D) Electronics: Electronics are made from a wide range of materials, including metals, plastics, and various chemical compounds. The production of electronics involves the extraction of raw materials, many of which are non-renewable resources.

Option C and E.

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Answer:c

Explanation:

it’s gained kinetic from the gravitational potential energy at the top

Pure iron is not so strong to use in construction field. Addition of carbon make iron more strong and less brittle.

The useful form of iron made by incorporating carbon and traces of other metals is called cast iron. Pure form of iron is not strong enough to be useful and it is brittle.

Steel does become stronger and more durable when carbon is added to iron, but only to a certain extent. It will then grow stronger but less resilient (ie like cast iron).

Iron is made stronger by carbon by altering its crystal lattice. In terms of effect, this distortion is comparable to work hardening. Sadly, it is a very complicated impact that depends on how the steel is heat treated and precisely how much carbon is applied. Not all metals are subject to this.

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To convert this number to scientific notation, count the number of zeros to the left of the significant figures. There are 4 of them.

Rewrite the significant figures in a way in which there is 1 digit in the whole part and 2 in the decimal part, the exponent of 10 will be the negative of the number of zeros:

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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Answer:

C. By super-cooling certain types of plasma.

Explanation:

Bose-Einstein condensate is a state of matter whereby atoms or particles become cooled to a very low energy state leading to their condensation to give a single quantum state.

Note that plasma refers to atoms that have had some or even all of its electrons stripped away leaving only positively charged ions. Simply put, plasma is ionized matter.

When certain types of plasma are super cooled, Bose-Einstein condensate are formed.

Five is the total number of peaks due to singly charged ions in the complete mass spectrum of chlorine, \(Cl_{2}\)

How many peaks do \(Cl_{2}\)'s molecular ions have?

The mass spectra of compounds with a single chlorine atom show two molecular ion peaks. This is because there are two isotopes of chlorine, 35Cl and 37Cl.

The molecular ion and fragment ions will both have peaks in the mass spectrum. When a mass spectrum is interpreted, a specific molecule can be located, confirmed, or its quantity can be calculated. the base summit of a mass spectrum's tallest (strongest) peak, caused by the ion with the highest relative abundance

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Five is the total number of peaks due to singly charged ions in the complete mass spectrum of chlorine, \(Cl_{2}\).

How many peaks do 's molecular ions have?

The mass spectra of compounds with a single chlorine atom show two molecular ion peaks. This is because there are two isotopes of chlorine, 35Cl and 37Cl.

The molecular ion and fragment ions will both have peaks in the mass spectrum. When a mass spectrum is interpreted, a specific molecule can be located, confirmed, or its quantity can be calculated. the base summit of a mass spectrum's tallest (strongest) peak, caused by the ion with the highest relative abundance

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Answer:

See explanation

Explanation:

An initiation step is the first step in a free radical mechanism. In this step, free radicals are generated from a stable compound. The initiation step tends to increase the concentration of radicals present in the system.  It leads to a net increase in the number of free radicals in the system.

For the chlorination of 2,2-dimethylpropane, the initiation step is;

Cl2 + hv --------->2Cl.

Note that hv is used to represent light

Answer:

2700 kg/m³

Explanation:

First let's convert 2.7 g/cm³ to kg/cm³, keeping in mind that 1 kilogram equals 1000 grams:

Finally we need to convert 0.0027 kg/cm³ to kg/m³, keeping in mind that 1 meter equals 100 centimeters, as follows:

The answer is 2700 kg/m³.

Answer:  \(\frac{1}{\Delta H_{fusion}}\times 1kJ\times xg/mol\)

Explanation:

Latent heat of fusion is the amount of heat required to convert 1 mole of solid to liquid at atmospheric pressure.

If \(\Delta H_{fusion}\) is used to melt = 1 mole of solid

1 kJ of energy is used to melt = \(\frac{1}{\Delta H_{fusion}}\times 1kJ\)

Now if molar mass of  solid is x g/mol

Then mass of solid will be = \(\frac{1}{\Delta H_{fusion}}\times 1kJ\times xg/mol\)

Answer:

B. 1kJ x 1/ AHfusion * g/mol solid

Explanation:

Took test

Answer:

A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products. The properties of the products are different from those of the reactants.

I hope this helps.