Student
# Hours
Student
# Hours
Twenty students were surveyed to find out how
many hours of TV they watch during a school
week. The results are shown to the right. Answer
the following questions and round your answers to
the nearest half hour.
1
2
11
4
2.
5
12
1
3
3
13
2.
The mode of the data is I hours.
4
5
14
6
DONE
5
1
15
2
6
4
16
3
7
6
17
10
8
12
18
10
9
2
19
8
10
6
20
7

The components in an unknown mixture are separated based on differences in their speed along the stationary phase.

Chromatography is a separation technique which us used to separate the components of a colored mixture based on the ability of the components to move along a medium at different speeds.

The components of a colored mixture have different densities and different adsorption properties.

Thus they move at different speeds over the stationary phase of the chromatogram.

Therefore, the components of an unknown mixture are separated based on differences in their velocity in the stationary phase.

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Answer:

I think its the first one but im not 100%

Explanation:

Answer:

its c :)

Explanation:

brainlist please

Answer:

350mmHg

Explanation:

Use Dalton law

Total=P gas 1+p gas 2+ P gas 3

825=P1+350+125

825=P1+475

825-475= P1

P1= 350 mm Hg

Answer:Hua Tuo practiced medicine throughout his life and was proficient in internal medicine, surgery, gynecology, pediatrics, acupuncture and moxibustion. The characteristic is that only a few herbs are used, and only a few herbs are used; Acupuncture is only one or two needles. Before placing the needle, he said to the patient: "Take a certain Xu, if it comes, speak to someone" (the needle will reach a certain part, if you feel it, tell me). Sickness will be cured.

Answer:

32.92 moles of Mg

Explanation:

To convert grams to moles (Or vice versa) of any chemical compound we need to use the molar mass of the substance (That is, how many grams weighs 1 mole of the chemical).

The magnesium, Mg, has a molar mass of 24.305g/mol. That means in 800.0g of Mg you have:

800.0g * (1mol / 24.305g) =

Answer:

Independent Variable : type of insulator material used

Dependent Variable: temperature of water

Constants: Type of bottle used, volume of water in each bottle

Explanation:

In discussing any experiment, the important factors are; the independent variable(s), dependent variable (s) and constant (s).

In this experiment, the type of insulator material (wool, cotton and nylon) was manipulated and the temperature of water when each insulator is used was carefully measured. The type of bottle and volume of water in each bottle were held constant

The nature of insulator material (independent variable) determined the temperature of the water (dependent variable) when the type of bottle and volume of water in each bottle were held constant.

By comparing the temperature of water when the different insulator materials were used, the best insulator material can be deduced.

Answer:

They are single celled organisms and they are microscopic

Explanation:

Answer:

Blue Whale

Explanation:

I hope this helps:)

Answer:

The blue whale!

Explanation:

Answer:

0 its stationary it has no momentum

Explanation:

Answer:

It had changed by .001 liters because of the way that cold air can't evaporate more than .5 liters of air

Explanation:

Answer: Heat flows from the coffee to the spoon through conduction.

Answer:

Although atoms are the smallest units that can be found in all matter, these atoms have a complex structure when experimentally analyzed. In order to understand almost all concepts in chemistry, it is essential to clearly understand the basic structure of an atom. Crystals are solid compounds made out of a number of atoms or molecules. There are particular arrangements in crystals. These arrangements are called crystal structures. Examining the crystal structure is very important in determine

Explanation:

Answer:

Although atoms are the smallest units that can be found in all matter, these atoms have a complex structure when experimentally analyzed. In order to understand almost all concepts in chemistry, it is essential to clearly understand the basic structure of an atom. Crystals are solid compounds made out of a number of atoms or molecules. There are particular arrangements in crystals. These arrangements are called crystal structures

Explanation:

The ideal gas law is the state equation of a hypothetical ideal gas. The volume of the nitrogen gas is 51 I.

The general gas equation, commonly known as the ideal gas law, is the state equation of a hypothetical ideal gas. The ideal gas equation is formulated as:

PV = nRT

In this equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.

As it is given that the pressure on the nitrogen is 720 torr, the temperature of the gas is 20°C(293 k), and the moles of nitrogen are 2.0 moles. Therefore, using the ideal gas equation the volume of the nitrogen can be written as,

[tex]pv=nRT\\\\v = \dfrac{nRT}{p}\\\\v = \dfrac{2 \times 62.396 \times 293}{720}\\\\v = 50.7834 \approx 51[/tex]

Thus, the volume of the nitrogen gas is 51 I.

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Answer:

answer in picture

Explanation:

Answer:

118 g of Ar; 28.8 g of [tex]NO_{2}[/tex]

Explanation:

To convert from moles to grams, you simply multiply by the atomic mass. So the conversion table looks as follows:

[tex]\frac{2.95 mol}{1} *\frac{39.95 g}{1 mol}[/tex]

The mol units cancel, and you are left with 118 g of Argon (117.8525 without sig-figs).

As for the next part of our problem, the first thing we need to do is find the molar mass of [tex]NO_{2}[/tex]. e can do this by adding the weight of all the atoms within the compound:

N + 2(O) = (14.01) + 2(16) = 46.01 g

Then, we repeat the above process, except we use the molar mass we just found instead of the atomic weight:

[tex]\frac{0.627 mol}{1}*\frac{46.01 g}{1 mol}[/tex]

Once again, the mol units cancel, and we are left with 28.8 g of [tex]NO_{2}[/tex] (28.84827 before sig-figs).

Answer:

D.) H-O

Explanation:

Polarity is determined based on the difference in electronegativity of the atoms. The greater the difference, the more polar the bond. The general trend is that the atoms in the top-right corner of the periodic table are the most electronegative.

A.) is incorrect because H-H has no electronegativity difference, making it nonpolar.

B.) and C.) are incorrect because their electronegativity differences are not the greatest.

D.) is correct because the electronegativity difference between the H and O is the greatest.

Q: What happens to the movement of molecules when their temperature is

raised?

A: When heat is added to a substance, the molecules and atoms vibrate faster. Hope this helps!

Answer:

help me

Explanation:

plz

Molarity determines the molar concentration of the solute dissolved in the solution. Mass and volume should be measured for the estimation of the molarity.

Molarity is the mass of the solute present in the litre of solution. It is also called molar concentration as it estimates the concentration of the compounds.

The unit of molarity is mol/L and can be given by the formula:

[tex]\rm Molarity(M) = \rm \dfrac{ \text{Mass of solute}}{\text{Molar mass of solute}}\times \text{Volume of Solution in L}[/tex]

Therefore, for the formation of a 2M potassium nitrate solution, the volume of the solution and mass of the solute is required.

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Answer:

b

Explanation:

Answer:

Neutralization is when the pH (power of hydrogen ions) of a solution is at 7 (considered neutral in the pH scale). This means it's neither acidic nor basic and is neutral. In order to neutralize an acidic solution, you pour in the same amount of a strong base. And in order to neutralize a basic solution, you pour in the same amount of a strong base.

A neutralization reaction will give you salt and water. A common neutralization reaction could be:

HCl (strong acid) + NaOH (strong base) ----> NaCl (Salt) + H2O (water)

Answer:

smaller

Explanation:

hope this helps!

Answer:

When something goes viral on the internet, it gets really popular. As it gets more and more popular, more people see it. For instance, as a video becomes viewed more and more, it is recommended to more and more people to watch.

This is a good example of how a virus spreads. As more and more people receive the virus in a community, more and more people get it. Then, the more likely it is to spread to more people.

Explanation:

I hope this helps. I didn't know if you wanted a 500 word essay or something...

Answer:

it's when you post something and everyone likes it that's what viral means

Answer:

B

Explanation:

Answer:

b or c

Explanation:

which ever one u think make more sense

b. inference meaning- a conclusion raeched on the basis of evidence and reasoning

c. scientific notation meaning-a way to express real numbers that are too large or too small to be conveniently written in decimal form.

The elements that have the highest valence electrons, oxygen bonding ratio and electron configuration are found towards the bottom right corner of the periodic table.

The periodic table is an arrangement of elements in groups and periods. The groups are vertical while the periods are horizontal and all the elements belong to one group or the other.

The pattern that exists in the periodic table regarding valence electrons, oxygen bonding ratio and electron configuration is that the elements that have the highest valence electrons, oxygen bonding ratio and electron configuration are found towards the bottom right corner of the periodic table.

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Answer:

The further down and to the right one goes, the higher the number of valence electrons, oxygen bonding ratio, and electron configuration.

Explanation:

Chem 101

The reasons why there was an increase in pressure after school in Jennifer's bike's tires were:

As a result of the temperature increasing outside the tires on account of there being more heat during the day time, the air molecules in the tire became heated up and gained more kinetic energy.

This allowed them to move more rapidly and collide with the walls of the tire which much more force so that when Jennifer checked the pressure again, it had increased.

In conclusion, options A and C are correct.

Find out more on kinetic energy at https://brainly.com/question/8101588.

Question 1: Which statement describes the quantities that can be found using the number of moles?

Answer: It can be used to find the number of molecules, atoms, or ions.

Question 2: A scientist uses 3 g of water (H2O) in an experiment. Which option describes the first step in calculating the number of molecules in 3 g of water?

Answer: Identify the molar masses of H and O.

Question 3: The molar mass of ammonia (NH3) is 17.03 g/mol. Which expression correctly shows how to determine the number of moles of ammonia equivalent to 5 g?

Answer: 5 g×1 mol/17.03 g

Question 4: How many molecules of carbon dioxide (CO2) are there in 0.450 mol of carbon dioxide?

Answer: 2.71×1023

Question 5: When magnesium chloride (MgCl2) is dissolved in water, which statement must be true?

Answer: The sum of the mass of the Mg2+ ions and the mass of the Cl– ions must be equal to the mass of MgCl2.