List 3 countries known to have poor water quality.

Answer:

blank 1 ----> 1

blank 2 -----> 1

blank 3 ------> 3

Explanation:

easy one!

Answer:

4.96 x 10²²atoms

Explanation:

Given parameters

Mass of Ba  = 11.3g

Unknown:

Number of atoms  = ?

Solution:

To solve this problem, we need to find the number of moles of Ba first and then the number of atoms it contains.

    Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

  Molar mass of Ba = 137.3g/mol

  Number of moles  = [tex]\frac{11.3}{137.3}[/tex]   = 0.08mole

 1 mole of a substance contains 6.02 x 10²³ atoms

  0.08 mole of Ba will contain 0.08 x 6.02 x 10²³ atoms  = 4.96 x 10²²atoms

Answer:

c

Explanation:

ionic bonds; cations (metals) GIVE electrons to anions (nonmetals)

Answer:

Salt

Explanation:

Answer: A gas

Explanation: Contrary to popular belief, it is not salt. Salt can be separated from water.

Answer:

Basically it would be  8.5g. Not total sure.

Explanation:

If its right plz give brainlest.

Answer:

A. 8.5g

Explanation:

Have a great day!

Answer:

(1) Digestive System gets nutrients (good) from food and hands it over to the blood and Circulatory System then carries those nutrients where they need to go. (2) Filters out waste from food and pushes it through intestines and out the body (and you know how and where it gets out).

Answer:

D: Condensation

Explanation:

Hope This Helps! :)

Answer:0.124 mol- I think not completely positive on it

Explanation:6680⋅mm⋅Hg is not a realistic measurement of pressure....

I assume you mean 6680⋅mm⋅Hg/760⋅mm⋅Hg⋅atm^-1 = 8.79⋅atm.

And we use the Ideal Gas Equation:

n=PV/RT=8.79⋅atm×0.347⋅L/0.0821⋅L⋅atm⋅K−1⋅mol−1×300⋅K=0.124⋅mol

Answer:

As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer. There are two basic types of waves: mechanical and electromagnetic

Explanation:

hope it helps

plz mark it as brainlist

Explanation:

pH is a scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions are measured to have lower pH values than basic or alkaline solutions. The pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution.

Answer:

B. Hydrogen (H)

c. Nitrogen (N)

D. Sodium (Na)

Explanation:

Answer:

This question is all sorts of messed up but i'm pretty sure I figured it out and its  

A

Explanation:

Answer:

All measurements have a degree of uncertaintyregardless of precision and accuracy. This is caused by two factors, the limitation of the measuring instrument (systematic error) and the skill of the experimenter making the measurements (random error).

Answer:

4.9 x 10²²hockey pucks

Explanation:

Given parameters:

Number of moles of hockey  = 0.0814moles

Unknown:

Number of pucks there = ?

Solution:

A mole of a substance is made up of Avogadro's number of particles.

Therefore;

       1 mole of hockey pucks will contain 6.02 x 10²³ hockey pucks

       0.0814 mole of hockey pucks will contain :

                              0.0814 x 6.02 x 10²³ = 4.9 x 10²²hockey pucks

Answer:

Hydrolysis reaction

Explanation:

Answer: Milligrams ,grams ,kilograms ,quintals, tons

Explanation: Hope this helps

Answer:

Explanation:

Is it worth it? Joy

Answer:

Increase of pressure

Explanation:

When the rock is placed in the water is adds pressure into the water causing it to rise.

Answer:

CARBON MONOXIDE

Explanation:

Carbon monoxide is produced by incomplete combustion of hydrocarbon fuels. Poisoning by carbon monoxide is caused by operating improperly vented space heaters or furnaces in poorly ventilated buildings.

Answer:

554.13 grams

Explanation:

The mass of 5.82 mol of MgCl2 is 552.9g. Details about how to calculate mass can be found below.

The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.

According to this question, there are 5.82 moles of MgCl2. The mass is calculated thus:

molar mass of MgCl2 = 24 + 35.5(2) = 95g/mol

mass of MgCl2 = 95g/mol × 5.82 moles

mass of MgCl2 = 552.9g

Therefore, the mass of 5.82 mol of MgCl2 is 552.9g.

Learn more about mass at: https://brainly.com/question/19694949

#SPJ2

Answer:

872093.02moles

Explanation:

Given parameters:

Number of atoms of Sucrose  = 5.25 x 10²⁹atoms

Unknown:

Number of moles  = ?

Solution:

To solve this problem, we must understand that a mole of any substance contains the Avogadro's number of particles.

             6.02 x 10²³ atoms makes up 1 mole of an atom

             5.25 x 10²⁹ atoms will contain = [tex]\frac{5.25 x 10^{29} }{6.02 x 10^{23} }[/tex]  = 872093.02moles

Answer:The number of atoms in 2.0 mole Al is A. 2.0 Al atoms. B. 3.0 x 1023 Al atoms.

Secondly, is aluminum an atom or molecule? Aluminum is the second element in the thirteenth column of the periodic table. It is classified as a post-transition metal and a "poor metal". Aluminum atoms contain 13 electrons and 13 protons. There are 3 valence electrons in the outer shell.

Answer:

No

Explanation:

In order for glucose to be produced inside the mixture, photosynthesis has to take place. The photosynthetic process requires a series of steps within an organelle called the chloroplast. The chloroplast contains the chlorophyll and other enzymes that are necessary for photosynthesis.

Once the chlorophyll is isolated, it becomes separated from the enzymes necessary for the completion of photosynthesis, and the process is truncated. When light is shined on the mixture, the majority would instead be lost as heat while some cause the chlorophyll molecules to glow.

Answer:

1,1,1

decomposition reaction

Explanation:

The reaction equation is given as:

      _Ca(OH)₂  →   _CaO    +   _H₂O

This reaction is a decomposition reaction in which a single reactant breaks down to give two or more products.

To balance the equation, we assign variables a, b and c, then we use a mathematical approach to solve the problem;

          aCa(OH)₂  →   bCaO    +   cH₂O

Conserving Ca : a = b

                    O:  2a  = b + c

                   H:   2a = 2c

let a  = 1, b = 1 , c = 1

the number of protons in the nucleus in an atom

Answer:

the atomic number represents the number of protons an atom has.

Explanation:

Hi for this one u just need to remember and use the equation.

[tex]moles = \frac{mass}{mr} [/tex]

then u find mr of potassium which is 39.1.

then u do

[tex] \frac{20}{39.1} [/tex]

you get the answer as 0.5115 write ur answer to 3 significant figures which will be 0.512 moles .

hope this helps :)

Answer:

1. Where the sun's energy is produced.

Explanation:

2. Region that energy moves through radiation

3. Hot gases move up and cool gases sink down.

4.  Appears as a red ring around the sun.

I really hope this helps :)

0.0463 mol KCl

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Step 1: Define

3.45 g KCl

Step 2: Identify Conversions

Molar Mass of K - 39.10 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of KCl - 39.10 + 35.45 = 74.55 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

0.046278 mol KCl ≈ 0.0463 mol KCl