Choose all the answers that apply.
Argon (Ar) is in group 18. Argon ____.
1. is part of the noble gas group
2. has 18 electron shells
3. does not react readily with other elements
4. has properties similar to other elements in group 18
5. forms a salt when combined with a metal​

Answer:

the answer for the question is B and E

Rhizobium bacteria were soil microbes that have the ability to convert dissolved nitrogen from the atmosphere. These root nodules on woody plants contain rhizobium bacteria.

The nitrogen cycle is finished by denitrification, which turns nitrate (NO3-) back into gaseous nitrogen (N2). The driving force behind this procedure is denitrifying microorganisms. These bacteria generate energy from nitrate rather than oxygen, which results in the release of nitrogen gas into the environment.

Azotobacter, Bacillus, Clostridium, or Klebsiella species are a few instances that belong to this category of nitrogen-fixing bacteria. These organisms must acquire their own energy source, as was previously said. Typically, they do this by oxidising organic molecules generated by the other organisms or as a result of decomposition.

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Answer:

second one is better

Explanation:

system is very much hot in first state..so wait for cooling down the system..but these depend on the organic compounds and products you are using. sometimes we need to carryout further steps in hot state..then you can't wail it to cool down

Answer:

B

Explanation:

because water has the always has the same volume but it can change shape of the glass or container that it is put in

Answer:

This will be a story. (comic can also be done with this. In fact it is better)

The title is the journey of the ice cube. (change it if you want)

Main character - ice cube

There was an ice cube made by the water from the freezer in an ice shop.

The ice cube, with a bunch of other ice cubes, were taken to be packed and sold to a restaurant. The ice cube was excited to where he was going while the other ice cubes are just meh. Now that the ice cubes arrived, a restaurant worker stores the ice cubes in a cooler and later used to put ice in a lemonade. While the lemonade in a glass cup was carried outside the porch of the restaurant by the waiter, the ice cube was fascinated by the environment of the restaurant. The waiter finally serves the thirsty customer and the customer drank almost half of the lemonade but the ice cube did not get in the man's mouth. Instead the other ice cubes went. The ice cube feared the person. Shortly after checking his phone, the customer was about to reach on to the glass until the hands accidentally pushes the glass over and falls. The ice cube and the remaining ice cubes spread away with the wasted lemonade liquid. No one bothered cleaning up the ice cubes, only the glass shards because the floor is a smooth concrete. Outside was really hot from the sun anyways so it would melt the ice cube and sooner evaporate. As it was in liquid form, the "ice cube" was feeling relaxed because it was just chilling on the floor. And when it evaporates, the ice cubes becomes more fascinated since it goes up to the sky while having a sky-view from above.

The circumference of a circle is 11π cm. Then the area is 30.25 π cm.

The term area is defined as the region bounded by the shape of an object. The area of a shape is the space covered by a figure or any two-dimensional geometric shape in a plane.

The area of a shape is the measurement of its surface. To calculate the area of a rectangle or square, multiply the length and width of the rectangle or square.

C = pi d

Therefore,

11π cm = diameter

Radius is 1/2 the diameter

Then radius = 5.5π cm

Area = πr²

Area = 30.25 π

Thus, The circumference of a circle is 11π cm. Then the are is 30.25 π cm.

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The height of a ramp does not directly determine the strength of the frictional force between a book and an object.

The strength of the frictional force between a book and an object is not directly influenced by the height of a ramp. The nature of the surfaces in contact, the force forcing the surfaces together (normal force), and the coefficient of friction are some of the variables that affect the frictional force between two surfaces.

The coefficient of friction between the book and the object plays a major role in determining the strength of the frictional force.

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107 g of aluminum can be heated from 12.71 to 72.03 by 5,737.39 amount of energy.

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.

It is given by the formula -

                                                 Q = mcΔT

where, Q = amount of heat

m = mass

c = specific heat

ΔT = Change in temperature

Q = 5737.39 J

ΔT = ( 72.03 - 12.71) = 59.32 ⁰C

Q = mcΔT

5737.39 = m × 0.9 × 59.32

mass = 107.46g

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Answer:

Explanation:

Salt is a mineral substance composed primarily of sodium chloride (NaCl). It is commonly used in cooking, food preservation, and as a seasoning. There are several types of salt, including:

Table salt: This is the most common type of salt, which is refined and processed to remove impurities. It is typically iodized to prevent iodine deficiency.

Sea salt: This is made by evaporating seawater and contains trace minerals, giving it a slightly different taste than table salt.

Himalayan salt: This is a type of rock salt that is mined from the Himalayan Mountains. It is known for its pink color and contains trace minerals.

Kosher salt: This is a coarse-grained salt that is commonly used in kosher cooking. It has a larger crystal size than table salt and is less dense.

Pickling salt: This is a fine-grained salt that is used for pickling and canning. It does not contain any additives like iodine or anti-caking agents.

Answer:

This change is only a physical change because the wind and water do not change the chemical make-up of the rock, the weathering is only changing the size nothing else.

Explanation:

Physical changes happen when objects or substances experience a change that does not alter their chemical constitution.

Because some of the physical characteristics of the rocks change, but their personalities do not. The shreds of rock are ordered as their sizes and shapes change, but their identities and total section endure the same.

The empitical formula shows the simplest ratio of elements in a compound (not the total number of atoms in the molecule).

So to find the empirical formula we need to calculate how many moles of each atom we have in this sample. Then we will see the ratio of each element.

We are given the mass, so to convert it to moles we use the molar mass. For this we go to the periodic table and see that the values for each element are:

Na (sodium): 22,99 g/mol

H (hydrogen): 1 g/mol

P (phosphorus): 25,81 g/mol

So we calculate the moles of each element as follows:

And as we see, for every 0.833 moles of Na we have the same number of moles of P, so the ratio of these elements in the molecule is 1 to 1.

As for the hydrogen:

So the ratio Na to H is 1 to 2.

Now we can write the empirical formula as follows=

E) The mass number does not change and the atomic number decreases by 1.

In beta decay, a neutron is converted into a proton and a high-energy electron (beta particle), which is emitted from the nucleus.

What is Proton?

A proton is a subatomic particle with a positive electric charge, found in the nucleus of every atom. It is a type of hadron and is composed of two up quarks and one down quark, held together by the strong nuclear force. The number of protons in the nucleus of an atom determines the element it is, and is referred to as the atomic number. The mass of a proton is approximately 1 atomic mass unit (amu), or 1.007276 amu to be more precise.

The number of protons in the nucleus increases by one, while the number of neutrons decreases by one. Therefore, the atomic number increases by 1, while the mass number remains the same.

The electron is emitted from the nucleus, and the atomic number increases by 1 because a new proton is formed. The mass number does not change because the total number of nucleons (protons and neutrons) is conserved. Therefore, the correct answer is E) The mass number does not change and the atomic number decreases by 1 in beta minus decay. In beta plus decay, a proton in the nucleus is converted into a neutron, a positron, and a neutrino. The positron is emitted from the nucleus, and the atomic number decreases by 1 because a proton is converted into a neutron.

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Answer:

J.J. Thomson

Explanation:

Answer:

D

Explanation:

took the test

Answer: 8 electrons

Explanation:

Answer: 8 valence electrons

Explanation: This is because the maximum electron an energy level can hold is 8 making it a stable atom

Answer:

If you began the course with Process Module 2, Solving. Personal and Family Problems, this planning form has already been introduced.

Explanation:

The correlation between cognitive ability and job performance is represented by  D: strong, positive. Numerous studies have demonstrated that individuals with higher cognitive abilities tend to perform better in various job tasks and roles.

Cognitive ability refers to an individual's mental capacity to learn, solve problems, reason, and process information. It plays a crucial role in determining job performance, as it affects the ability to acquire job-related knowledge and skills.

This strong, positive relationship indicates that as cognitive ability increases, so does job performance. Employers often use cognitive ability tests during the recruitment process to predict an applicant's potential job performance. However, it is essential to note that cognitive ability is not the sole predictor of job success.

Other factors, such as personality traits, motivation, and job-specific skills, also contribute to overall job performance. In conclusion, there is a strong, positive correlation between cognitive ability and job performance, but other factors should also be considered when evaluating an individual's potential success in a job role.

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The number of atoms in 3 moles K of the particle is 1.806 x 10²⁴ atoms.

The value of one mole of an atom is equal to exactly 12 grams of pure carbon-12.

12.00 g (C-12 ) = 1 mol C-12 atoms = 6.02 × 10²³ atoms .

The number of particles in 1 mole is called Avogadro's Number (6.0221421 x 10²³).

The number of atoms in 3 moles K of the particle is calculated as follows;

= 3 moles  x   6.02 × 10²³ atoms / mol

= 1.806 x 10²⁴ atoms

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Answer:

Oxidation Reduction

Explanation:

Your welcome ;) Marking me brainliest would make me be very appreciative

Answer:

The second one

Neutrons

Answer:

7

Explanation:

A 7.90-g sample of fluorine yields 7.95g of SF₆ in the presence of excess sulfur

Percent yield is the ratio of actual yield divided by theoretical yield multiplied by 100. It gives information regarding the percentage of products formed in the reaction.

Percentage yield = Actual yield / Theoretical yield × 100

Percent yield is very important in the manufacture of products.

Percent yields are understandably less than  100%, however, percent yields greater than  100% are possible if the measured product of the reaction contains impurities that cause its mass to be greater than it actually would be if the product was pure.

Theoretical yield is the expected amount of products formed in the reaction.

Given,

Mass of Fluorine = 7.9g

Percent yield = 79%

Moles of Fluorine = mass / molar mass

                              = 7.9 / 38

                              = 0.2078

From the reaction, 3 moles of F₂ will give 1 mole of SF₆

So, 1 mole of F₂ gives 1/3 mole of SF₆

0.2078 moles of F₂ will give 1/3 × 0.2078

                                             = 0.069 moles of SF₆

Theoretical yield of SF₆ = moles × molar mass

                                        = 0.069 × 146

                                          = 10.07g

Percent yield = Actual yield × 100 / Theoretical yield

Actual yield = (79 × 10.07) / 100

                    = 7.95g

Therefore, a 7.90-g sample of fluorine yields 7.95g of SF₆ in the presence of excess sulfur.

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Answer:

59.92 × 10²³ atoms are in 9.95 moles of iron

1.8 ×10²² molecules are in 0.03 moles of Carbon dioxide

1.19 moles are found in 7.20 x 10^23 atoms of platinum

Answer:

312140 LB/CU FT

Explanation:

MULTIPLY

Answer:First one is acheolgogist

Explanation:

The vapor pressure of the solution containing 24.6 g of camphor dissolved in 98.5 g of benzene would be lower than the vapor pressure of pure benzene.

To calculate the vapor pressure of the solution, we need to apply Raoult's law, which states that the vapor pressure of a solution is directly proportional to the mole fraction of the solvent present.

Step-by-step explanation:

1. Calculate the number of moles of camphor (C10H16O) and benzene (C6H6) using their respective molar masses.

  Moles of camphor = mass of camphor / molar mass of camphor

  Moles of benzene = mass of benzene / molar mass of benzene

2. Calculate the mole fraction of benzene.

  Mole fraction of benzene = moles of benzene / (moles of benzene + moles of camphor)

3. Use Raoult's law to calculate the vapor pressure of the solution.

  Vapor pressure of the solution = mole fraction of benzene * vapor pressure of pure benzene

Note: The vapor pressure of pure benzene is given as 100.0 mmHg at 26.1 °C.

In the description, I have provided the general steps to calculate the vapor pressure of the solution based on Raoult's law.

However, I cannot provide the exact numerical calculation without the values of the molar masses of camphor and benzene.

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Answer:

Dipole dipole interaction

Explanation:

Answer:

This is a mixture.

Explanation:

While you can no longer see the salt when it's dissolved, it's still there! It's just in tiny, tiny, invisible to the eye molecules. It's now a mixture of H20 molecules and NaCl molecules in a solution :)

The water doesn't bond to the salt, so it's not a compound.

It's not just one element, it's a mixture of many!

It's not a pure substance since it's NaCl AND H2O.

Answer: yes, it depends on the substance though

Explanation:

You test your hypothesis by completing an experiment.

We test our hypothesis by performing experiment or research because in an experiment, we test our hypothesis and collect data in order to draw a conclusion from it.

So we can conclude that you test your hypothesis by completing an experiment.

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Answer:

Regulation of body temperature

Explanation:

6.86 x 10⁻¹¹ mol/L [OH-] is the pH of the resulting solution if 45 ml of 0.432ml methylamine, CH₃NH₂ is added to 15 ml of 0.234 m Hcl.

We must ascertain the amount of H+ ions present in the resultant solution in order to calculate its pH.

For the reaction between HCl and CH₃NH₂, the balanced equation is:

CH₃NH₂ + HCl + CH₃NH₃ + Cl-

We can deduce from the equation that when 1 mole of HCl is combined with 1 mole of CH₃NH₂, 1 mole of CH₃NH₃+ and 1 mole of Cl- are produced.

0.015 L x 0.234 mol/L = 0.00351 mol = moles of HCl

0.045 L x 0.432 mol/L = 0.01944 mol for moles of CH3NH2

All of the HCl will react with the CH₃NH₂ to produce CH₃NH₃+ and Cl- because it is anticipated that the reaction will proceed to completion.

The moles of CH₃NH₃+ in solution are as a result:

CH₃NH₃+ moles equal 0.01944 mol

Kw / Ka for CH₃NH₃+ = Kb for CH₃NH₂.

we obtain: The formula for 2.28 x 10-11 is (0.324 mol/L)([OH-]) / 0.108 mol/L = 6.86 x 10-11 mol/L [OH-]

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