. Use the following reaction to determine how much of each product would be released if 42 000 kg (42 tonnes) of methyl isocyanate reacted with excess water:

Answer:

=  1.03 x 10⁻² g H₂O

Explanation:

To find the mass of water, you need to (1) convert grams CH₄ to moles CH₄ (via molar mass), then (2) convert moles CH₄ to moles H₂O (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles H₂O to grams H₂O (via molar mass). The final answer should have 3 sig figs to reflect the given value (4.60 x 10⁻³ g).

Molar Mass (CH₄): 12.011 g/mol + 4(1.008 g/mol)

Molar Mass (CH₄): 16.043 g/mol

Combustion of Methane:

1 CH₄ + 2 O₂ ---> 2 H₂O + 1 CO₂

Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol

Molar Mass (H₂O): 18.014 g/mol

4.60 x 10⁻³ g CH₄          1 mole             2 moles H₂O          18.014 g
--------------------------  x  -----------------  x  ---------------------  x  ----------------  =
                                     16.043 g            1 mole CH₄             1 mole

=  0.0103 g H₂O

=  1.03 x 10⁻² g H₂O

M HCl = 11.7 M = 11.7 mol/L = 0.0117 mol/ml

mass HCl = 36.5 g/mol x 0.0117 mol/ml =0.427 g/ml  

% mass = mass HCl : density

% mass = 0.427 : 1.65 = 0.259 = 25.9%

or formula:

M = (%mass x ρ x 10) : MM

% mass = (M x MM) : (ρ x 10)

% mass = (11.7 x 36.5) : (1.65 x 10)

% mass = 25.9

Answer:

E

Explanation:

100 minutes is   5 half lives  ( 100 min/20 min/half life)

         = (1/2 )^5

1 x 10^20    *    (1/2)^5 =   3.125 x10^18   molecules

Answer:

8 Hydrogen Atoms

Explanation:

The subscripts that are next to the coefficient (letter) indicates how much atoms the element/compound has.

So:

(CH3) × 2 ⇒ 6 hydrogen atoms

+ 1 from (CH) and another from (OH) ⇒ 8 atoms

Answer:

- Nucleus Function - Controls and regulates the activity of the cell.

- Ribosome builds proteins.

- A vesicle structure is kinda like a sac filled with a fluid of sorts.

- Rough ER has ribosomes attached to the cytoplasmic side of the membrane.

- Golgi apparatus kinda looks like a "stack of peta bread"

- Golgi apparatus functions as a factory in which proteins received from the ER are further processed and sorted for transport to their eventual destinations

The cytoskeleton of a cell is made up of microtubules, actin filaments, and intermediate filaments.

- The smooth endoplasmic reticulum functions in many metabolic processes. It synthesizes lipids, phospholipids as in plasma membranes, and steroids.

- The mitochondria produced energy/ATP

- Mitochondria have a double membrane arrangement that separates the organelle into four distinct compartments

- The cytosol contains an organized framework of fibrous molecules that constitute the cytoskeleton

Answer:

D

Explanation:

it's a forest so erosion is out and rotting is not really a reaction

Answer:D

Explanation:

If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy 25.48 L at STP.

The volume of a gas at STP can be calculated using the direct proportion method.

According to this question, 50.75 g of a gas occupies 10.0 L at STP, then 129.3g of the same gas will occupy the following:

= 129.3 × 10/50.75

= 25.48L

Therefore, if 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy 25.48 L at STP.

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c. Some health risks are increased by heredity, which manifest under certain environmental conditions.

The occurrence of certain diseases is influenced by certain environmental factors. Air pollution from a polluted environment increases the chance of allergic people or those with overactive immune systems acquiring respiratory conditions like asthma. A similar genetic flaw in melanin formation increases the risk of skin cancer in people who are exposed to UV rays. As a result, certain circumstances promote the development of disease.

Communities can lessen exposure to diseases and chemicals that have damaging effects on the body by focusing on environmental health. Environmental health treatments can improve everyone's quality of life, but they may be especially noticeable for people with pre-existing health conditions.

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The explanation for the large space between particles in a gas is provided by the kinetic theory (option C).

The kinetic theory is a scientific theory used in physics to understand the behavior of gases.

This theory (kinetic theory) indicates that molecular distances in gases are small when compared to the molecular sizes.

In conclusion, the explanation for the large space between particles in a gas is provided by the kinetic theory (option C).

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Complete Question :

Which of the following describes scientists?

A. People with similar personalities

B. People from different backgrounds

C. People with perfect understanding of science

D. People with only one perspective

Answer :

Scientists can be described as People with perfect understanding of science. Hence, Option (C) is correct answer

A scientist is a person who conducts scientific research to advance knowledge in an area of interest.

Scientists are motivated to work in several ways. Many have a desire to understand why the world is as we see it and how it came to be. They exhibit a strong curiosity about reality.

Therefore, Scientists can be described as People with perfect understanding of science. Hence, Option (C) is correct.

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The half-life of polonium-210, given that it decays from 98.3 micrograms to 12.3 micrograms in 414 days is 138 days

2ⁿ = N₀ / N

2ⁿ = 98.3 / 12.3

2ⁿ = 8

2ⁿ = 2³

n = 3

t½ = t / n

t½ = 414 / 3

t½ = 138 days

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The half life of the polonium-210 is 138 days.

The half-life is the time taken for half the sample to decay.

It takes 414 days for 98.3 g of to decay from 98.3 micrograms to 12.3 micrograms.

The fraction of 98.3 that is 12.3 g = 98.3/12.3 = 1/8

The sample has undergone 3 half-lives.

The half-life = 414/3 = 138 days.

In conclusion, it takes 138 days for half the sample to decay.

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The answers for the following questions are given below

A solution can be defined as a chemical mixture that is formed by two major components which are known as the solute and the solvent.

A solution based on its components varies in its type and function.

In conclusion, The answers for the following questions are given above.

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Answer:

Amount of water- constant

reaction rate- variable

temperature- constant

initial amount of tablet- constant

particle size- variable

Explanation:

The disease prevention methods are as follows:

Disease prevention refers to the steps taken to protect oneself from developing a particular disease.

The disease prevention methods for the given diseases is as follows:

In conclusion, disease prevention is the best policy in health care.

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Answer:

saturared alkane

because of its single bonded

Water stores energy more efficiently than air under equal conditions.

It requires more energy to heat water than it does to heat air because water has a significantly larger heat capacity and specific heat than air. Compared to air, which has a specific heat of 1.005 J/g degreesC, water has a specific heat of 4.186 J/g degreesC.

Specific heat:

The amount of heat required to raise the temperature per unit mass is known as specific heat capacity. The heat in Joules required to increase the temperature of 1 gram of sample by 1 Kelvin or degree Celsius is often stated. Water is an excellent temperature regulator since it has a very high specific heat capacity.

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The concentration of the reactants and products will balance out.

It is a characteristic of reversible reactions in which there will be no net change in the concentration of the reactants and that of the products.

In the reaction: a + b ---> c + d

At the beginning (time 0), a and b will react to produce c and d.

As soon as c and d are produced, 2 reactions go on simultaneously:

These reactions continue until as much c and are being produced as much as a and b.

In other words, equilibrium is reached when there is no net production of a and b as well as c and d.

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No of molecules of Aluminium trisulphate

No of moles of each

Total=17

So no of oxygen atoms

There are 12 oxygen atoms in a formula unit of [tex]\rm Al_2(SO_4)3[/tex].

In the formula unit of [tex]\rm Al_2(SO_4)3[/tex], there are a total of 12 oxygen atoms. To determine the number of oxygen atoms, we break down the formula into its constituent elements.

[tex]\rm Al_2(SO_4)3[/tex] consists of 2 aluminum (Al) atoms, 3 sulfate ([tex]\rm SO_4[/tex]) ions, and each sulfate ion contains 4 oxygen (O) atoms.

Therefore, the number of oxygen atoms is calculated as follows:

Number of oxygen atoms = 2 (Aluminum atoms) + 3 (Sulfate ions) x 4 (oxygen atoms per sulfate ion)

Number of oxygen atoms = 2 + 12 = 14

Thus, there are 12 oxygen atoms in a formula unit of [tex]\rm Al_2(SO_4)3[/tex].

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Some of the methods that can be used to prevent diseases and health problems are:

This refers to the proactive measures that are taken in order to stop a disease from ever occurring.

Hence, we can see that disease prevention is important as it helps to keep a person healthy and he can do this by engaging in healthy practices such as washing of hands, etc.

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Answer:

keeping things above 40 degrees Celsius as that can fasten the rot process of fruits and vegetables

Light, oxygen, heat, humidity, temperature and spoilage bacteria can contribute to food spoilage

Tiny living things called microorganisms like bacteria, molds, and yeasts can get into our food and make it go bad. They can become larger in size and increase in number, causing the food to feel different, look different, smell different, and taste different.

Enzymes in food can speed up spoilage. Enzymes can break apart the nutrients in food, which can cause the food to change and become less fresh.

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Precision refers to solute value, sensitivity is the ability to sense a change in solution, whereas accuracy and selectivity refer to the ability to detect the solute.

Potentiometric titration refers to a chemistry analytical strategy used to identify a particular substance, which may be a solute in the solution.

A potentiometric analysis is based on the use of electrodes capable of recording different values of the titrant substance, which enables the determination of the concentration of a given solute.

In conclusion, precision refers to solute value, sensitivity is the ability to sense a change in solution and accuracy and selectivity refer to the ability to detect the solute.

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The temperature rise of each substance depends on its specific heat capacity.

The rise in temperature in a substance depends on the specific heat capacity of the substance.

The formula to determine the temperature rise is give as:

Q = mcΔT

Where:

Substances with large heat capacities have the lowest temperature rises while those with small heat capacities have the biggest temperature increase.

In conclusion, the temperature rises depends on the specific heat capacity.

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From the  stoichiometry of the reaction, 1.4 * 10^-3 g is produced.

The equation of the reaction is written as; CO2 + 2LiOH → Li2CO3 + H2O. This can help us to apply the principle of stoichiometry here.

Thus;

Number of moles of CO2 = 0.00345 g/44 g/mol = 7.8 * 10^-5 moles

If 1 mole of CO2 produced 1 mole of water

7.8 * 10^-5 moles of CO2 produced  7.8 * 10^-5 moles of water

Mass of water produced =  7.8 * 10^-5 moles * 18 g/mol = 1.4 * 10^-3 g

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Another example of an obsolete scientific theory is Lamarck theory that was challenged by Darwinian evolution.

An obsolete or superseded scientific theory is a scientific theory that, though once widely accepted, has since been discarded or superseded.

According to this question, one example of obsolete scientific theory is Flat Earth theory, which states that the Earth's shape is flat, like that of a paper.

Another example of an obsolete scientific theory is Lamarck theory that was challenged by Darwinian evolution.

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The sub-levels in order of the number of electrons they can hold will be s, p, d, and f.

There are 4 sub-levels, namely; s, p, d, and f.

Each level represents an orbital with some orbitals having multiple degenerates.

Thus, the ascending order in terms of the number of electrons each sublevel can hold will be s, p, d, and f.

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Explanation:

Metano: CH₄; Etano: C₂H₆; Propano: C₃H₈; Butano: C₄H₁₀; Pentano: C₅H₁₂; Hexano: C₆H₁₄; Heptano: C₇H₁₆; Octano: C₈H₁₈; Nonano: C₉H₂₀; Decano

The simulated value of the number of atoms are as follows:

A = 27, B = 16, C = 9, D = 4, E = 2, F = 2, G = 0 and H = 0.

The half-life is the time taken for half the number of atoms in a given sample of the element to disintegrate or decay.

The expected amount of the sample left after a given number of half-lives is given in the table.

The simulated value of the amounts are found to be:

A = 27, B = 16, C = 9, D = 4, E = 2, F = 2, G = 0 and H = 0.

In conclusion, the expected number of atoms and the simulated values of the number of atoms differed slightly.

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Answer:

1470 kJ (to 3 sf)

Explanation:

(802)(1.83) = 1470 kJ (to 3 sf)