Please answer this question...
(The question is the attached pic)​

Explanation:

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

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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[tex]molar \: mass = 48 \\ element = cadmium[/tex]

Answer:

A.) Titanium

Explanation:

The graph appears to be a mass spectrum. This graph describes the abundance of an element in a sample. The x-axis measures the mass of the element. As such, you can identify the element by determining which element has an atomic weight (g/mol) that matches the highest peak.

Titanium = 47.867 g/mol

Cadmium = 112.41 g/mol

Vanadium = 50.942 g/mol

The highest peak appears to be at 48. From these atomic weights, it seems that titanium is the element with the closest mass.

This graph is measuring an unknown element, so ideally, there would be only one peak. If this is a graph of one element, then why are their multiply smaller peaks? The smaller peaks are most likely isotopes or impurities.

Answer:

0.1 kilometer

Explanation:

First, multiply 5,000 by two to get your cm after 5,000 years which is 10,000 cm and then divide by 100,000 to convert to kilometers which is 0.1.

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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Answer:

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:

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

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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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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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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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

Answer:

saturared alkane

because of its single bonded

Answer:

D

Explanation:

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

Answer:D

Explanation:

The mass percentage of nickel in nickel phosphate is 48.1%.

Percentage by mass of nickel in nickel phosphate is 48.1%.

Here we have nickel phosphate - Ni₃(PO₄)₂

In this formula there are-

3 Ni atoms , 2 P atoms and 8 O atoms

now, the molecular mass nickel phosphate is- = 3 × molar mass of Ni + 2 × molar mass of P + 8 × molar mass of O

Now we know that -

molar mass of Ni = 58.7u

molar mass of P = 31u

molar mass of O = 16

So that here-

molecular mass of nickel phosphate = 3 × 58.7 + 2 × 31 + 8 × 16 = 176.1 + 62 + 128 = 366.1u

Now, mass of nickel in nickel phosphate = 3 × 58.7  = 176.1u

And for mass percentage - mass percentage = ( mass of nickel / mass of nickel phosphate ) × 100 =  (176.1 / 366.1) × 100 = 48.10 %

Hence we can conclude that the mass percentage of nickel in nickel phosphate came out to be 48.1 % after applying all the concepts.

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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 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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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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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 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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The molality of the solution which is composed of 342 moles of sugar were dissolved in 171 kilograms of water is 0.002 mol/g.

To calculate the molality of a solution, you need to divide the number of moles of solute by the mass of the solvent (in kilograms).

Given:

Number of moles of sugar (C₁₂H₂₂O₁₁) = 342 moles

Mass of water (H₂O) = 171 kilograms

Molality (m) = moles of solute/mass of solvent in kg

First, convert the mass of water from kilograms to grams:

Mass of water = 171 kilograms × 1000 grams/kilogram

= 171,000 grams

Now we can calculate the molality:

Molality = 342 moles / 171,000 grams

However, before we proceed, we consider the molecular weight of sugar (C₁₂H₂₂O₁₁) to convert from moles to grams.

The molecular weight of sugar can be calculated as follows:

12 carbon atoms × 12.01 g/mol = 144.12 g/mol

22 hydrogen atoms × 1.01 g/mol = 22.22 g/mol

11 oxygen atoms × 16.00 g/mol = 176.00 g/mol

Adding up the individual atomic masses

144.12 g/mol + 22.22 g/mol + 176.00 g/mol

= 342.34 g/mol

Now we calculate the molality:

Molality = 342 moles / 171,000 grams

= 0.002 mol/g

Therefore, the molality of the solution composed of 342 moles of sugar dissolved in 171 kilograms of water is 0.002 mol/g.

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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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Answer:

1470 kJ (to 3 sf)

Explanation:

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

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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If the diameter of an atom is 1 × 10⁻⁸ cm, the diameter of the nucleus is approximately 1 × 10⁻¹² cm, since the atom is mostly empty space.

The nucleus is the part of an atom that contains more than 99.9% of its mass, represented by protons and neutrons.

The diameter of an atom is 1 × 10⁻⁸ cm. The nucleus is about 10,000 times smaller than the atom. Thus, the diameter of the nucleus is:

d(nucleus) = d(atom) / 10,000

d(nucleus) = 1 × 10⁻⁸ cm / 10,000 = 1 × 10⁻¹² cm

If the diameter of an atom is 1 × 10⁻⁸ cm, the diameter of the nucleus is approximately 1 × 10⁻¹² cm, since the atom is mostly empty space.

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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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