Does anyone know how to do it

Answer:

14/2.1 thats just what i do

Explanation:

If the [OH⁻] of a solution is  2.7 × 10⁻⁴ mol/L the pOH of the solution is 3.569.

pH is used to measure whether the substance is acidic, basic or neutral and the range is 0-14.

To calculate the pOH it is expressed as:

pOH = - log[OH⁻]

        = - log[2.7 × 10⁻⁴]

        = - [log 2.7 + log  10⁻⁴]                        [log a × b = log + log b]

        = - [log 2.7 - 4 log 10]                          [log aˣ = x log a]

        = - [log 2.7 - 4 × 1]                                [log 10 = 1]

        = - [log 2.7 - 4]

        = - [0.431 - 4]

        = - [-3.569]

        = 3.569

Thus, from above conclusion we can say that If the [OH⁻] of a solution is  2.7 × 10⁻⁴ mol/L the pOH of the solution is 3.569.

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Answer:

is it a yes or no question

if it is yes

Explanation:

Answer:

94.4 Psi

Explanation:

Given that;

P1 = 105 psi

T1 = 25˚C + 273 =  298 K

P2 = ?

T2 = – 5˚C + 273 = 268 K

P1/T1 = P2/T2

P1 T2 = P2T1

P2 = P1T2/T1

P2 = 105 * 268/298

P2= 94.4 Psi

Answer:

222.2 grams of CaCl2 in 2 moles

Explanation:

Mole=given mass/gram mass formula

2moles=x/Gram Mass Formula

(Gram Mass Formula of CaCl2):

Ca=40.1

Cl= 35.5 x 2= 71

-----------------------

GFM=111.1

2 moles = x/111.1 g

x=222.2

Answer:

fgedhwkmgfvhcdnxj

Explanation:

gtryijdohuygfvbhgfy

Answer:

8g

Explanation:

1mole of oxygen -->2moles MgO

32g --> 80g

?g --> 20g

(20x32)÷80

= 8g oxygen

Answer:

Mass of oxygen needed  = 8 g

Explanation:

Given data:

Mass of oxygen needed = ?

Mass of MgO formed  = 20 g

Solution:

Chemical equation:

2Mg + O₂     →    2MgO

Number of moles of MgO:

Number of moles = mass/molar mass

Number of moles = 20 g/ 40 g/mol

Number of moles = 0.5 mol

Now we will compare the moles of MgO and O₂:

                        MgO         :            O₂

                           2            :            1

                          0.5          :        1/2×0.5 = 0.25 mol

Mass of oxygen needed:

Mass = number of moles × molar mass

Mass = 0.25 mol × 32 g/mol

Mass = 8 g

Answer:

A derived unit is defined as the unit that is created from a  product of SI base units. Volume is an example of derived unit because it is not possible to measure volume directly using any measuring device For eg., Volume of water in bucket is can not be measured using rule, or scale, or any other measuring device.

Hence, volume is a derived unit.

Answer:

50 g

Explanation:

Please brainiest

Answer:

cause of climate change: The earth's climate is affected and changed through a lot of natural causes like volcanic eruptions.

how it causes change:  Volcanoes can be extremely dangerous to earth because it can impact climate change. During major explosive eruptions huge amounts of volcanic gas, aerosol droplets, and ash are injected into the stratosphere.

what is the effect of the change: Major eruptions alter the Earth's radiative balance because volcanic aerosol clouds absorb terrestrial radiation, and scatter a significant amount of the incoming solar radiation, an effect known as "radiative forcing" that can last from two to three years following a volcanic eruption.

i hope you get it correct!! <3 can i plz get a brainlest!

Answer:

3.66 g de 2-feniletanol (C5H5-CH2-CH2-OH)

1.8 * 10 ^ 22 moléculas

Explanation:

Sabemos que podemos obtener la masa de una sustancia a partir del número de moles presentes de la siguiente manera;

número de moles = masa / masa molar

masa molar de 2-feniletanol (C5H5-CH2-CH2-OH) = 122,16 g / mol

masa = 0.03 moles * 122.16 g / mol = 3.66 g de 2-feniletanol (C5H5-CH2-CH2-OH)

Si 1 mol = 6.02 * 10 ^ 23 moléculas

0.03 moles = 0.03 moles * 6.02 * 10 ^ 23 moléculas = 1.8 * 10 ^ 22 moléculas

Answer:

xii. B. Smelting

xiii. D. Carbon

Explanation:

Smelting is known to be a process by which a metal is gotten. It is gotten either as the element or as a simple compound. This is obtained from metal's ore by heating. The heating can be done ordinarily in the presence of oxidizing agents, like air, or reducing agents, carbon e.g coke.

Zinc is gotten after Zinc oxide is heated in the presence of carbon.

This process is smelting.

Concentrated tetraoxosulphate acid is a strong dehydrating agent. It has the ability to char wood, paper, or sugar, leaving a carbonaceous residue. The charring effect is as a result of the carbon that is found in the wood.

The acid sucks in the oxygen and hydrogen, leaving behind the carbon; this results in the charring effect.

Answer:

0.78× 10 ²³ molecules

Explanation:

Given data:

Mass of pyridine = 10.35 g

Number of molecules = ?

Solution:

Number of moles of pyridine:

Number of moles = mass/molar mass

Number of moles = 10.35 g/ 79.1 g/mol

Number of moles = 0.13 mol

Number of molecules;

1 mole contain 6.022× 10 ²³ molecules

0.13 mol × 6.022× 10 ²³ molecules / 1mol

0.78× 10 ²³ molecules

Answer:

it would need to lose energy

Explanation:

I don't really have an explanation

As the electrons gets closer to the nucleus, by the electrostatic force of attraction electrons are tightly bound to the nucleus. To move the inner electron to outer shell, high energy have to applied to weaken the nuclear force.

Nuclear force is the force by which the nucleon are bind in the nucleus and electrons are attracted towards the nucleus. The positively charged protons inside the nucleus electrostatically attracts the negatively charged electrons.

The minimum amount of energy required to remove an electron from the valence shell by overcoming the nuclear force is called ionization energy.

To bring an electron which is closer to the nucleus to the outer shell needs much energy to reduce the nuclear attractive pull. The energy need to gain.

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Answer:

If the mass of an object increases, then its kinetic energy will increase proportionally because mass and kinetic energy have a linear relationship when graphed.

Explanation:

is correct answer

Answer:

Sample Response: If the speed of an object increases, then its kinetic energy will increase proportionally because speed and kinetic energy have a linear relationship when graphed.

Explanation:

Answer:

D. all of the above

Explanation:

it is short for chlorofluorocarbons,are man-made chemicals and attack the ozone.

Answer:

its the sun

Explanation:

Answer:

D. empty space

Explanation:

Most of the volume of a gas is empty space, which allows gases to be easily compressed. Gas particles are in constant motion, moving rapidly in straight paths. When gas particles collide, they rebound and travel in new directions. Every time they hit the walls of the container, they exert pressure.

Answer:

6.9L

Explanation:

Answer:

A spatial pattern is a perceptual structure, placement, or arrangement of objects on Earth. It also includes the space in between those objects. Patterns may be recognized because of their arrangement; maybe in a line or by a clustering of points.

Explanation:

Answer:

The pressure of the gas is 0.35 atm.

Explanation:

We can find the pressure of the gas by using the Ideal Gas Law:

[tex] P = \frac{nRT}{V} [/tex]

Where:

V: is the volume = 605 mL = 0.605 L

n: is the number of moles = 0.00803 moles

T: is the temperature = 39 °C = 312 K

R: is the gas constant = 0.082 L*atm/(K*mol)

Hence, the pressure is:

[tex] P = \frac{0.0083 moles*0.082 L*atm/(K*mol)*312 K}{0.605 L} = 0.35 atm [/tex]

Therefore, the pressure of the gas is 0.35 atm.

I hope it helps you!    

Answer:

Elements

Explanation:

An element is any substance that cannot be broken down into simpler form by ordinary chemical means.

Elements are distinct substances that cannot be split up into simpler substances. .

Such substances consist of only one kind of atom. There are over hundred elements known till date. Elements are made up of unique atoms. In a chemical reaction, elements combines and rearranges.

Answer:

1) 7.80 X 10^22[tex]\frac{1}{6.02*10^{23} }[/tex] = .13

2) 5.6 [tex]\frac{6.02*10^{23} }{1}[/tex] = 3.4 X 10^24

3)3.81 [tex]\frac{1}{74.55}[/tex] X [tex]\frac{6.02*10^{23} }{1}[/tex] = 3.08 X 10^22

4) 399.91 [tex]\frac{4.05*10^{23} }{6.02*10^{23} }[/tex] = 269

5)4.32 [tex]\frac{1}{18.01}[/tex] X [tex]\frac{22.4}{1}[/tex] = 5.37

Explanation:

For 2 the correct answer is 3.4 instead of 3.2. The 3.4 is rounded from 3.37. Sadly I couldn't figure out the bonus.

Answer:

Applied

Explanation:

Since Brent is using his existing scientific knowledge to create a new product or invention then this falls under the category of Applied Research. Applied research includes using any theoretical or proven information in order to create something physical that can be used in our real-life world. Usually, this research focuses on solving a problem through the use of technology. Thisis exactly what Brent is trying to do by creating a new plastic that does not have harmful chemicals that can hurt babies in the long term.

Answer:applied

Explanation:

Answer:

C. 3CO(g) + Fe2O3(s)

Explanation:

The substance(s) to the hath left of the arrow in a chemical equation art hath called reactants.  A reactant is a substance yond is presenteth at the starteth of a chemical reaction.  The substance(s) to the right of the arrow art hath called products.  A product is a substance yond is presenteth at the endeth of a chemical reaction

So in this example, 3CO(g) + Fe2O3(s) art the reactants.

The 2Fe(S) + 3CO2(G) art the products.

Desire I holp! Has't a most wondrous day!

Hope I helped!  Have a great day!

Answer:

I think it would be Yellow