CHEMISTRY HIGH SCHOOL

Potassium (K) has an atomic number of 19. It often forms an ion by losing 1 electron. How many electrons would the ion have?

Answers

Answer 1
Answer:

Potassium (K) has an atomic number of 19. It often forms an ion by losing 1 electron, the remaining electrons that the ion will have is 18 electrons.

What is atomic number?

Atomic number is defined as the number of chemical elements in the periodic system, in which the elements are ordered in ascending order of the number of protons in the nucleus.

It is also defined as a chemical element's nuclear charge number is the charge number of an atomic nucleus.

Electrons are defined as the negativity charge subatomic particle that together with protons and neutrons forms an atoms.

Protons are positively charge while neutrons are neutral.

Thus, potassium (K) has an atomic number of 19. It often forms an ion by losing 1 electron, the remaining electrons that the ion will have is 18 electrons.

To learn more about atomic number, refer to the link below:

brainly.com/question/16858932

#SPJ2

Answer 2
Answer: 18 since it is losing one electron. an ion is a charged atom. if it gains an electron, it is negatively charged and if it loses an electron it is positively charged.

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HIGH SCHOOL

In a study designed to prepare new gasoline-resistant coatings, a polymer chemist dissolves 6.143 g poly(vinyl alcohol) in enough water to make 100.0 mL of solution. At 25°C, the osmotic pressure of this solution is 0.272 atm. What is the molar mass of the polymer sample?

Answers

Answer:

MM = 5,521.54 g/mol

Explanation:

To solve this, we need to use the expression for osmotic pressure which is the following:

π = MRT (1)

Where:

M: Concentration of the solution

R: gas constant (0.082 L atm/ mol K

T: temperature in K

25 °C in Kelvin is: 25 + 273.15 = 298.15 K

Now, we do not have the concentration of the solution, but we do have the mass. and the concentration can be expressed in terms of mass, molar mass and volume:

Concentration (M) is:

M = n/V (2)

and n (moles) is:

n = m/MM (3)

Therefore, if we replace (2) and (3) in (1) we have:

π = mRT/V*MM

Solving for MM we have:

MM = mRT/πV (4)

All we have to do now, is replace the given data and we should get the value of the molar mass:

MM = 6.143 * 0.082 * 298.15 / 0.1 * 0.272

MM = 150.1859 / 0.0272

MM = 5,521.54 g/mol

This is the molar mass.

HIGH SCHOOL

Explain how using dimensional analysis could have prevented this crash

Answers

Dimensional analysis is a convenient technique to determine if the solution you're following would lead you to the answer that you're looking for. It is the manipulation of units. Like units are cancelled whenever they appear on the numerator and the denominator side. For example, if the speed is 5 m/s and the time is 2 s, the distance would be:

(m/s)*(s) = m

So, you would know that the solution would be 5*2 because it yields the unit for distance. 

Hence, dimensional analysis could prevent crash by calculating the right velocities or distances of the two vessels to prevent collision.
MIDDLE SCHOOL

Percent Error Problems – Find the percent error for each problem below. I. Samantha measured the volume of her Mountain Dew before she drank it for her breakfast. She measured the volume of the soda in the 355 mL bottle as 343 mL.

Answers

% error = 3.4 %

Percent error = |accepted value - experimental value|/accepted value × 100%

∴ % error = |355 mL – 343 mL|/355 mL × 100 % = |12|/355 × 100 % = 3.4 %

MIDDLE SCHOOL

What is a very strong dipole-dipole force?​

Answers

Answer: Dipole-dipole forces: electrostatic interactions of permanent dipoles in molecules; includes hydrogen bonding.

Explanation:

https://courses.lumenlearning.com/introchem/chapter/dipole-dipole-force/- More on the Topic not sure if this will help though?

HIGH SCHOOL

Find the molarity of 750 ml solution containing 346 g of potassium nitrate

Answers

Given mass of KNO₃=346g
Molar mass of KNO₃=(39.098)+(14)+(15.99*3)=101.068gmol⁻¹
Volume of Solution=750ml=0.75dm³

Molarity=(mass of solute/molar mass of solute)*(1/volume of sol. in dm³)
            =(346/101.068)*(1/0.75)
            =4.56 mol dm⁻³
HIGH SCHOOL

If the base-dissociation constant, Kb, for a substance is 4.3 x 10^–10, what does this tell you about Ka?

Answers

Answer: The acid dissociation constant for the given substance is

Explanation:

To calculate the acid dissociation constant for the given base dissociation constant, we use the equation:

where,

= Ionic product of water =

= Acid dissociation constant

Base dissociation constant =

Putting values in above equation, we get:

Hence, the acid dissociation constant for the given substance is

Ka*Kb=Kw=10^-14
Ka=10^-14/(4.3*10^-10) (at 25°C)
COLLEGE

a 0.1845g sample of molybdenum metal is covered with hydrochloric acid and heated until the reaction is complete and excess chlorine is driven off. When weighed, the final product of the metal and chlorine had a mass of 0.5936g. What is the empirical formula if the compound?

Answers

Answer:

       

Explanation:

The final product of the metal and chlorine will contain only the total original amount of molybdenum metal (0.1845 g) and chlorine.

Hence, you can determine the amount of chlorine in the compound by subtraction:

  • Amount of chlorine in the compound = amount of compound - amount of molybdenum metal

  • Amount of chlorine = 0.5936 g - 0.1845 g = 0.4091 g

The empirical formula is the formula that represents the ratio of atoms in the compound using the least positive integer numbers.

Then, you need to convert the masses in grams to number of moles, for which you use the atomic mass of each element.

1. Atomic masses:

  • Atomic mass of molybdenum, Mo: 95.94 g/mol
  • Atomic mass of chlorine, Cl: 35.453 g/mol

2. Number of moles:

Number of moles = mass in grams / atomic mass

  • Number of moles of Mo: 0.1845 g / 95.94 g/mol = 0.001923 mol
  • Number of moles of Cl: 0.4091 g / 35.453 g/mol = 0.01154 mol

3. Ratio of moles:

Divide each number of moles by the least number of moles:

  • Mo: 0.001923 / 0.001923 = 1
  • Cl: 0.01154 / 0.001924 = 6

Ratio:

  • Mo: Cl = 1:6

Hence, the empirical formula is:    

MIDDLE SCHOOL

Why is mitosis important to all living things

Answers

Growth. Mitosis is basically the growth in multi cellular organisms, and that works well with asexual organisms who do not produce another organism with a sexual partner... a good example of this is bacteria.
With cell division all living organism are able to grow and it also helps replace old cells
MIDDLE SCHOOL

Which of the following is a pure substance?
Air
Blood
Copper
Wood​

Answers

Answer:

copper

Explanation:

its an element, its not mixed with anything else

The answer is "Copper" or option C. Air, and blood aren't pure substances but mixtures, wood is also a mixture which means the answer is copper. Pure Substances are is matter with composition and distinct chemical properties.

Hope this helps.

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