The following list contains some common polyatomic ions. Using the charge on these ions and the idea of valence,
predict the formulas for the compound formed from the following:
potassium and permanganate

A) K(MnO4)
B) K4MnO4
C) K4MnO
D) KMnO4

Explanation:

one mole of any substance there are 6.022×1023 units of that substance. (This number is called Avogadro's number, NA.)

We need to convert the mass of silicon to moles using the molar mass of silicon, 28.06gmol. This number means that one mole of pure silicon would have a mass of 28.06g. Our given mass, however, is in milligrams; to convert this to grams we'll use the conversion factor 1g103mg:

5.86mg Si(1g103mg)=0.00586g Si

Now, using silicon's molar mass, we'll convert this mass to moles of Si:

0.00586g Si(1mol Si28.06g Si)=2.09×10−4mol Si

Finally, let's use Avogadro's number to convert

The number of atoms in a 92.8 mg sample of Si is 1.99×10²¹ atoms

From Avogadro's hypothesis, we understood that:

Recall,

1 mole of Si = 28.09 g

Now, we shall convert 28.09 g to mg. This can be obtained as follow:

1 g = 1000 mg

Therefore,

28.09 g = 28.09 × 1000

Thus, 28.09 g is equivalent to 28090 mg

Therefore,

Finally, we shall determine the number of atoms in 92.8 mg sample of Si. This can be obtained as follow:

28090 mg of Si = 6.02×10²³ atoms

Therefore,

92.8 mg of Si = [tex]\frac{92.8 * 6.02*10^{23}}{28090}\\[/tex]

Thus, 92.8 mg sample of Si contains 1.99×10²¹ atoms

Learn more: https://brainly.com/question/5809151

Answer:

10

Explanation:

subtract

According to the Law of Conservation of Mass, the bag should weigh 40g after the reaction has finished.

LAW OF CONSERVATION OF MASS:

Learn more at: https://brainly.com/question/24996173?referrer=searchResults

Answer:

7/9

Explanation:

4+3=7

leave the denominators be

Answer:

yes

Explanation:

Yes you can make the pH of a dilute strong acid higher than the pH of a weak acid. ... The lower the pH, the more is present in the solution. Strong acids like hydrochloric acid (HCl) almost completely dissociate into water to form ions. Weaker acids like ethanoic acid () only partially dissociates to form and ions.

Answer:

Tara is making a scrapbook using 24 photos and 8 newspaper clippings. She wants to put the same number of photos and clippings on each page. What is the greatest number of scrapbook pages Tara can make?

Explanation:

Tara is making a scrapbook using 24 photos and 8 newspaper clippings. She wants to put the same number of photos and clippings on each page. What is the greatest number of scrapbook pages Tara can make?

Answer:

The properties of metals as well as non metals is called metalloids.

Answer:andre plates is thin

Explanation:

earths gravitational field?

Answer:

v = 658.82 km/h

Explanation:

The distance between New York and London is [tex]5.6\times 10^3\ km[/tex]

Time taken from New York to London is 8.5 hours

We need to find the average speed of the plane.

Total distance covered divided by the total time taken is equal to the average speed of an object. So,

[tex]v=\dfrac{d}{t}\\\\v=\dfrac{5.6\times 10^3\ km}{8.5\ h}\\\\v=658.82\ km/h[/tex]

So, the average speed of the plane is 658.82 km/h.

Answer:

The correct name is barium (dihydrogen/dihydride

Explanation:

Google

Answer:

continental-continental convergent boundary

Explanation:

When two continental plates converge, they smash together and create mountains. The amazing Himalaya Mountains are the result of this type of convergent plate boundary. The Appalachian Mountains resulted from ancient convergence when Pangaea came together.

Answer:

continental-continental convergent boundary

Explanation:

Answer:

In chemistry, there are three definitions in common use of the word base, known as Arrhenius bases, Brønsted bases and Lewis bases. All definitions agree that bases are substances which react with acids as ... A ...

Acids are species with pH less than 7, while bases those with pH greater than 7. ... Using Arrhenius' definition, acids are those that produce the hydrogen ion when dissolved in water ( ) while bases produce the hydroxide ion ( ). These ions, when in water, act as charge carriers and can hence conduct electricity.

Acid–base reactions require both an acid and a base. ... For example, according to the Arrhenius definition, the reaction of B If inorganic, determine whether the compound is acidic.

Explanation:

I HAVE GIVE DIFINITIO FROM THAT YOU WRITE TRUE OR FALSE

the blue one i think dont quote me on it. Dont hate

Answer:

Explanation:

2nd one

kinda hard to see it tho

Answer:

2H3PO4+ 3Ca(OH)2=Ca3(PO4)2+6H20

Answer:

pp

Explanation:

Answer:

Possibly

Explanation:

Answer:

the correct answer is B. far left

Explanation:

i just got it right on edge 2020 :p

In the more general sense, a pure substance is any homogeneous mixture. That is, it is matter that appears uniform in appearance and composition, no matter how small the sample size. Examples of pure substances include iron, steel, and water. Air is a homogeneous mixture that is often considered to be a pure substance. (got the answer from google hehe)

The intensive properties among the options provided are:

A) a substance has a density of 4.13 g/cm3

D) a substance has a mass of 1.25 g

E) a substance has a volume of 5.4 mL

Intensive properties are those that do not depend on the amount or size of the substance but are characteristic of the substance itself.

These properties, density, mass, and volume, are intrinsic to the substance and do not change with the quantity of the substance present. They are independent of the amount of the substance and remain constant regardless of the sample size.

On the other hand, melting point (B) and malleability (C) are not considered intensive properties. Melting point can vary depending on external conditions such as pressure, and malleability is influenced by the structure and composition of the substance, which can be affected by impurities or processing methods. These properties can change with the amount or size of the substance and are considered extensive properties.

Learn more about Intensive properties from the link given below.

https://brainly.com/question/13055036

#SPJ2

Answer:

A.  Cl₂

B.  51.36 g K

C.  245.3 g KCl

Explanation:

Balance the given chemical equation

K  +  Cl₂  ⇒  KCl

2 K  +  Cl₂  ⇒  2 KCl

A. To find the limiting reagent, first convert the mass of each reactant to moles.  The molar masses are 39.10 g/mol for K and 70.91 g/mol for Cl₂.

(180 g)/(39.10 g/mol) = 4.60 mol K

(120 g)/(70.91 g/mol) = 1.69 mol Cl₂

Now, convert moles of each reactant to moles of the product.  You can do this by using the mole ratio in the balanced chemical reaction.  The reactant with the smallest moles of product is the limiting reagent.

(4.60 mol K) × (2 mol KCl/2 mol K) = 4.60 mol KCl

(1.69 mol Cl₂) × (2 mol KCl/1 mol Cl₂) = 3.29 mol KCl

Cl₂ is the limiting reagent.

B.  You need to find out how much excess K you will have.  Since Cl₂ is the limiting reagent, you will only make 3.29 mol of KCl.  Convert this value to moles of K using the mole ratio.

(3.29 mol KCl) × (2 mol K/2 mol KCl) = 3.29 mol K

Now convert moles of K to grams.  The molar mass is 39.10 g/mol.

(3.29 mol K) × (39.10 g/mol) = 128.64 g K

This is how much K will be consumed in the reaction.  Subtract the total amount of K by the amount that will be consumed.

180 - 128.64 = 51.36 g

There will be 51.36 g of excess K.

C.  You know that you will produce 3.29 mol of KCl based on previous calculations.  Convert this to grams.  The molar mass is 74.55 g/mol.

(3.29 mol) × (74.55 g/mol) = 245.3 g KCl

You will produce 245.3 g of KCl.

Answer:

1. Mixtures

2. Solutions

3. Heterogeneous

4. Sand-water

5. Salt-water mixture

6. Water

Explanation:

1. Indeed, Matter could exist and substances or Mixtures, which is also subdivided into two.

2. These substances can also be in the form of solutions.

3. Heterogeneous on the other hand refers to mixtures that are not totally uniform such as Sand-water.

4. Sand-water are good examples of Heterogeneous mixtures.

5. Salt-water mixture falls under the category of homogeneous mixtures as they are totally uniform.

6. Water is also an example of a homogeneous mixture because basically two elements Hydrogen and Oxygen combine uniformly to form water.

Answer:

Mass of metal = 64 g

Explanation:

Given data:

Density of metal = 4 g/mL

Volume of water = 400 mL

Volume of water + metal = 416 mL

Mass of metal  = ?

Solution:

First of all we will calculate the volume of metal

Volume of metal = (Volume of water + metal) - volume of water

Volume of metal = 416 mL -  400 mL

Volume of metal = 16 mL

Mass of metal:

d = m/v

4 g/mL = m/  16 mL

m = 4 g/mL ×16 mL

m = 64 g

Answer:

Speed = Distance/time

Let's take 't' to be the time

45 = 67/t

45t = 67

t = 67/45

t = 1.48

Answer: It is a Heterogeneous mixture.

Answer:

ummmmmmmmmmmmmmmm

Explanation:

Answer: well im taking the test right now. and i dont know so yah. good luck HAH

Explanation: