5. precaution necessary at the end of this experiment When hydrogen is burnt and the product cooled, the following results are obtained as shown in the diagram below: Dry hydrogen Clamp Burning hydrogen (a) Write the equation for the formation of liquid Y (b) Give a chemical test for liquid Y 0 0 0 Clamp Ice cold water Liquid Y​

Answer:

.107 moles

Explanation:

To find moles given the info above, we use a variation of the Ideal Gas Law,

mol = PV/RT, where P is in atm, V is in L, T is in K, and R is the gas constant

mol= 3.47(.950) / 377(.08206)

Answer:

\(\large \boxed{\text{D. 23.34 min}}\)

Explanation:

1. Find the order of reaction

Use information from the graph to find the order.

If a plot of ln[A] vs time is linear, the reaction is first order and the slope = -k.

2. Find the  half-life

\(k = \dfrac{\ln2}{ t_{\frac{1}{2}}}\\\\k = \text{-slope} = -(-2.97 \times 10^{-2} \text{ min}^{-1}) =2.97 \times 10^{-2} \text{ min}^{-1} \\ t_{\frac{1}{2}} =\dfrac{\ln 2}{k} = \dfrac{\ln 2}{2.97 \times 10^{-2}\text{ min}^{-1}} =\textbf{23.34 min}\\\\\text{The half-life is $\large \boxed{\textbf{23.34 min}}$}\)

The half life of the reaction is 23.33 minutes.

We know that for a first order reaction;

ln[A]t = ln[A]o  - kt

A plot of ln[A]t  against time (t) will yield a straight line graph with a slope of -k.

From the question, the slope is -2.97 x 10-2 min-1.

So, -2.97 x 10-2 min-1 = - k

k = 2.97 x 10-2 min-1

The half life of a first order reaction is obtained from;

t1/2 = 0.693/k

t1/2 = 0.693/2.97 x 10-2 min-1

t1/2 = 23.33 minutes

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Answer:

so so

Explanation:

this your question?? <_>

Answer:

I think that gravity can be considered a force.

Explanation:

As the object falls, it moves faster and faster. Gravity is considered a universal force because it acts between any two masses anywhere in the universe. For example, there is a gravitational pull between the Sun and the Moon. Even small masses attract one another.

Hope this helped! :)

In this question, we have to find 3 types of reactions, the reduction half-reaction, which is the reaction that will show only the element or compound that was reduced (gained electrons), the oxidation half-reaction, the element or compound was oxidized (lost electrons), and finally, the overall reaction, which will show both reduction and oxidation in one place:

Oxidation half-reaction

Cl^- -> Cl2

Reduction half-reaction

MnO4^- -> Mn^2+

Overall reaction:

MnO4^- + Cl^- -> Mn^2+ + Cl2

The human population grew from 1 billion in the year 1800 to approximately 7.8 billion in the year 2021.

In the year 1800, the estimated global human population was around 1 billion. Over the next two centuries, significant advancements in technology, medicine, agriculture, and improved living conditions contributed to a rapid increase in population.

The growth rate of the human population began to accelerate in the 20th century. By the year 1927, the global population reached 2 billion. It took just 33 years for the population to double, reaching 4 billion in 1960. The population continued to grow at an unprecedented rate, with 6 billion people on Earth by the year 1999. As of 2021, the estimated global population stands at approximately 7.8 billion.

This remarkable growth in population can be attributed to several factors, including advancements in healthcare leading to reduced infant mortality rates, improved access to education and contraception, increased agricultural productivity, and overall socio-economic development.

It's important to note that population growth has not been uniform across all regions. Different countries and regions have experienced varying rates of population growth due to factors such as fertility rates, mortality rates, migration patterns, and government policies.

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Answer:

Ionic bonds

Explanation:

It rymes.  haha i dont even know how to spell it! ;)

By using filtration, the sand and fine salt can be effectively separated based on their difference in particle size, providing a clean separation of the two components.

Filtration is a separation technique that takes advantage of the difference in particle size between sand and salt. It involves passing the mixture through a porous material, such as filter paper or a filter funnel, which allows the liquid (saltwater) and small salt particles to pass through while retaining the larger sand particles.

Here's how the filtration process can be carried out:

1. Set up a filter apparatus with a funnel and filter paper or a filter flask.

2. Place the mixture of sand and salt in a beaker or a flask.

3. Slowly pour the mixture into the filter paper or funnel, allowing the liquid (saltwater) to pass through while retaining the sand on the filter paper.

4. Once the liquid has passed through completely, the sand will be left behind on the filter paper or in the filter flask.

5. Carefully remove the sand from the filter paper or filter flask, and the saltwater solution can be collected separately.

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Answer:

D.) NaOH

Explanation:

Sodium always forms the cation, Na⁺.

Hydroxide is always written as OH⁻.

The compound should have an overall charge of 0 (be neutral). As you can see, the charges perfectly balance out (+1 + (-1) = 0). Therefore, there only needs to be one atom of each ion. The ionic compound is thus NaOH.

Answer:

Limiting reactant

Explanation:

The limiting reactant is completely is completely consumed in a reaction since it's not in excess and does not give a good yield of the product hence an excess reactant must have reacted with limiting reactant.

Valence electrons are the electrons located at the outermost shell of an atom and influence the rate of chemical reactions.

Valence electrons are the electrons in the outermost shell, or energy level, of an atom.

For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.

Also another example for the role of valance electron in chemical reactions is presented in the table attached.

Thus, the evidence from this data table demonstrates that the number of valence electrons strongly influences the chemical behavior of elements.

Elements with a small number of valence electrons tend to lose them to achieve a stable configuration, while elements with a larger number of valence electrons tend to gain electrons.

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The identity of a cation solution that produces a mix of red and yellow colors in a flame test, but appears red when viewed through a cobalt filter, can be attributed to the presence of the strontium (Sr) cation.

During a flame test, different metal cations emit characteristic colors due to the excitation of electrons and their subsequent emission of light. Strontium, in particular, is known to produce a vibrant red color in flame tests.

The presence of both red and yellow colors indicates the possibility of multiple metal cations in the solution. While the specific metal responsible for the yellow color is uncertain, it could potentially be sodium or another metal that emits a yellow flame.

When the flame is viewed through a cobalt filter, which absorbs yellow wavelengths of light, the yellow color is filtered out, resulting in only the red color being observed. Since strontium is known for its distinctive red flame color and its emission is not affected by the cobalt filter, it is likely the metal cation responsible for the observed red color. Therefore, based on these characteristics, the identity of the cation solution is most likely strontium (Sr).

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answer and explanation

we are asked to determine the number of mols of Oxygen in the sample and we can do this using the ideal gas equation

PV = nRT

and when we rearrange the equation to make n subject of the formula, we gent :

n = PV/RT

= (3.21atm x 47.6L) / (0.0821 x 285K)

= 152.796 / 23.3985

= 6.53 mols

The plasma membrane is semipermeable because proteins in the membrane act like gates to control entrance and exit of molecules.

Because the plasma membrane is semipermeable, only some compounds can pass through without being blocked by others. Proteins incorporated into the membrane play a major role in facilitating this selectivity. These proteins serve as gatekeepers and control how chemicals are transported through the membrane. Many protein types, including carrier proteins and channel proteins, aid in the movement of particular molecules by generating channels or changing their shape.

Therefore, the correct option is B.

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The mass of chlorine is 9.9 * 10^6 kg.

Total mass of CFC = M(CFC) * number of cars = 1.0 kg * 1.00 * 10^8

= 1.00 * 10^8 kg

Mass of the leaked CFC ;

% leaked = m(leaked) *100 / m(total)

m(leaked) = o.24 * 1.00 * 10^8 kg

m(leaked) = 2.4 * 10^6 kg

Now no. of moles of CFC:

n(CFC) = m(CFC) / MM(CFC) = 2.4 * 10^9 g / 170.92 g/mol = 0.014 * 10^9 mol

= 1.4 * 10^7 mol

No. of moles of chlorine ;

n(Cl) = n(CFC)*2

= 1.4  * 10^7 mol *2

= 2.8 * 10^7 mol

Now at last the mass of the chlorine :

m(Cl) = n(Cl) * MM(Cl)

= 2.8 * 10^7 mol * 35.453 g/mol

= 99.2 * 10^10 g

Mass of Cl = 9.9 * 10^6 Kg

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Answer:

1 mole = 6.022×10^23 atoms. 1 water molecule = 2 Hydrogen atoms + 1 oxygen atom. So, 1 mole H2O = 1.2044×10^24 hydrogen atoms. Therefore 2 mole H2O will have 2.4088×10^24 hydrogen atoms.

Explanation:

Answer:

Two positive aspects of using methane recapture systems are able to generate significant electricity. Another benefit is that the process of anaerobic digestion creates heat that can be used to warm buildings where animals are kept

Answer:  The correct answer is;

Two positive aspects of using methane recapture systems include lowering the impact on greenhouse gasses and the production of energy. Methane is a very potent greenhouse gas that is contributing to global warming. As a result, the recapturing process reduces the methane impacts of global warming by reclaiming and reusing the gas for other purposes. Recaptured methane can be stored and used to generate electricity or used as fuel to power updated vehicles and other engines on the farm. The overall benefits from this combination are reducing impacts causing global warming and lower the cost of electricity or fuel on the farm.

Explanation:  This answer has been confirmed correct.

The new volume of the balloon after heating it to a temperature of 51 °C is approximately 2.39 L.

Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.

It is expressed as;

\(\frac{V_1}{T_1} =\frac{V_2}{T_2}\)

Given that:

Substituting the given values and solve for V₂:

\(V_1T_2 = V_2T_1\\\\V_2 = \frac{V_1T_2}{T_1} \\\\V_2 = \frac{2.2\ *\ 324.15}{298.15 }\\ \\V_2 = 2.39 \ L\)

Therefore, the final volume is 2.39 litres.

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1) Diesel has a higher viscosity than petrol.

2) Petrol is more flammable than diesel.

3) The formula will be C₁₀H₂₂.

4) The equation is; 2C8H18+25O2→16CO2+18H2O.

Depending on the precise composition and temperature, the viscosity of gasoline and diesel can change. In general, diesel is more viscous than gasoline. Higher viscosity fluids are thicker and flow more slowly than lower viscosity fluids because viscosity relates to the resistance of a fluid to flow.

Diesel is less flammable than gasoline. The lowest temperature at which gasoline can evaporate and turn into an ignitable combination in air is known as its flash point, and it is lower for gasoline. Compared to diesel fuel, petrol vapors are much more flammable and can ignite at lower temperatures.

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Answer: According to the molecular orbital theory the shape and size of molecular orbital depends upon- Shape and size of combining atomic orbitals.

Explanation:

You could form approximately 5.8 grams of methanol (CH3OH) from the given gas mixture at STP.

Using the Ideal gas equation;

n = PV / RT

n = (1 atm * 7.82 L) / (0.0821 L·atm/(mol·K) * 273.15 K)

From the question;

nCO = n / 2

nH2 = n / 2

Then;

n = (1 atm * 7.82 L) / (0.0821 L·atm/(mol·K) * 273.15 K)

n = 0.362 mol

nCO = n / 2 = 0.362 mol / 2 = 0.181 mol

nH2 = n / 2 = 0.362 mol / 2 = 0.181 mol

By stoichiometry;

methanol= nCO = 0.181 mol

Mass of methanol =  0.181 mol * 32.04 g/mol

= 5.8 g

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Answer:

2- propanol is a better choice of solvent because it has lower boiling point and it evaporate off and it will not interfere with the product

Explanation:

The recrystallization solvent should have a fairly low boiling point because it makes it easier for the solvent to evaporate out when the solution air drys. The boiling point should be lower the melting point of the compound.

Answer:

There are 3 moles of atoms in one mole of BaCl2 .

Answer:

The human brain is the body's control center, receiving and sending signals to other organs through the nervous system and through secreted hormones. It is responsible for our thoughts, feelings, memory storage and general perception of the world. The human heart is a responsible for pumping blood throughout our body

When molecules collide, there is generally a delay before an explosion occurs, if an explosion occurs at all. This is because an explosion requires a chemical reaction to take place, which involves the breaking of chemical bonds and the formation of new bonds. These reactions require a certain amount of energy, which is called the activation energy.

The collision of molecules can provide energy to the system, but it is not always enough to overcome the activation energy needed for a chemical reaction to occur. If the energy of the collision is less than the activation energy, no reaction will occur and there will be no explosion. If the energy of the collision is equal to or greater than the activation energy, a chemical reaction may occur and an explosion may result.

The time delay between the collision of molecules and an explosion occurring depends on the nature of the molecules and the conditions under which the collision occurs. Some chemical reactions are very fast and can occur almost instantly, while others may take longer to reach the activation energy and proceed to completion.

It's worth noting that not all collisions between molecules result in an explosion. In many cases, the collision may simply transfer energy from one molecule to another without leading to a chemical reaction.

If an equation includes 7(CrO₄)₂, the numbers of Cr's and O's atoms that are there are 14 and 56 respectively.

The number of atoms present in a chemical compound can be calculated by multiplying the subscript of the particular element by any coefficient.

According to this question, 7 moles of chromate with the chemical formula; (CrO₄)₂ is given. The number of oxygen and chromium atoms in this compound can be calculated as follows:

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If you accidentally add salt instead of sugar to a recipe, you can use vinegar to counteract the salty taste.

If you have added salt instead of sugar to a recipe, then you can try to remove the salt by adding a substance that will counteract its flavor. One such substance is vinegar, which is an acid and can help to neutralize the salty taste. Here are the steps to remove salt from a dish:

1. Remove as much of the salty liquid or sauce as possible.

2. Dilute the remaining sauce or liquid by adding more of the ingredients in the recipe, except for the salt

3. Taste the dish and add more sugar if needed.

4. If the dish is still too salty, add a little bit of vinegar.

5. Keep tasting the dish and adjusting the sugar and vinegar until it is no longer too salty.6. If the dish becomes too sweet, add more of the other ingredients to balance it out.

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To convert from Joules to Calories, use the conversion factor of 1 Cal = 4.184 J, so:

39.72 J / 4.184 J/Cal = 9.48 Cal

These questions require calculations of heat energy transfer, which can be done using the formula:

Q = m * c * ΔT

Where:

Q = heat energy transfer in Joules

m = mass in grams

c = specific heat capacity in J/g°C

ΔT = change in temperature in °C

For the first part, a. Required to heat 5 grams of water from 5.5oC to 70oC:

m = 5 g

c for water = 4.18 J/g°C

ΔT = 70 - 5.5 = 64.5 °C

So, Q = m * c * ΔT = 5 * 4.18 * 64.5 = 1343.65 J

To convert from Joules to Calories, use the conversion factor of 1 Cal = 4.184 J, so:

1343.65 J / 4.184 J/Cal = 320.00 Cal

For the second part, b. Required to heat 10 grams of silver from 112oC to 275oC:

m = 10 g

c for silver = 0.24 J/g°C

ΔT = 275 - 112 = 163 °C

So, Q = m * c * ΔT = 10 * 0.24 * 163 = 39.72 J

To convert from Joules to Calories, use the conversion factor of 1 Cal = 4.184 J, so:

39.72 J / 4.184 J/Cal = 9.48 Cal

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Answer: there are 127.5g of N2 in 4.55 moles of this molecule

Explanation:

The question requires us to calculate the mass that corresponds to 4.55 moles of nitrogen (N2).

To solve this problem, we can use the molar mass of N2, which correlates the mass of the molecule with one mol of it.

The atomic mass of nitrogen is 14.01 u. Thus, the molar mass of nitrogen gas (N2) is:

molar mass N2 = 2 * 14.01 = 28.02 g/mol

Now, we know that there are 28.02g of N2 in 1 mol of this gas, thus we can write:

1 mol N2 ------------------- 28.02g N2

4.55 mol N2 -------------- x

Solving for x, we'll have:

Therefore, there are 127.5g of N2 in 4.55 moles of this molecule.