.When in lab what is the policy on tasting chemicals?

Answer:

C.

Explanation:

The molecules in hot air are moving faster than the molecules in cold air. Because of this, the molecules in hot air tend to be further apart on average, giving hot air a lower density. That means, for the same volume of air, hot air has fewer molecules and so it weighs less.

How is hotter air different than colder air?

Option C :- In hotter air, the molecules are farther apart and moving more rapidly.

Answer:

Nitrile, amide, carboxylic acid, phenyl (aka. arene)

**There are so many functional groups, so I may list some you don't know. There may also be some that I am not aware of. However, these are all the ones I can see.**

Explanation:

Nitrile: (bottom-left) N triple bonded to C

Amide: (middle) N single bonded to 3 carbons

Carboxylic Acid: (bottom-right) C-CO2H

Phenyl: (top-right) six carbon ring with alternating double bonds

Answer:

32

Explanation:

Answer:

[tex]n_{solute}=0.235mol[/tex]

Explanation:

Hello.

In this case, we are talking about molarity which is an unit of concentration relating the moles of the solute and the volume of the solution in liters only:

[tex]M=\frac{n_{solute}}{V_{solution}}[/tex]

Since the solute is the (NH4)2Fe(SO4)2 and the volume in liters:

[tex]V=94.00mL*\frac{1L}{1000mL} =0.094L[/tex]

Thus, for the given 2.50-M solution, the moles of solute result:

[tex]n_{solute}=M*V=2.50mol/L*0.094L\\\\n_{solute}=0.235mol[/tex]

Best regards.

The equilibrium concentration of Ag⁺ in the solution is : 7.5 * 10⁻⁶ M

Given that :

Ksp for AgIO₃ = 3 * 10⁻⁸

First step : Calculate the concentration of Ag⁺ and IO⁻₃ in the solution

[ Ag⁺ ] = ( mmol Ag⁺ / mL solution )

          = ( 50 * 0.00200 / 100 mL ) = 0.001 M

[ IO⁻₃ ] = ( mmol IO⁻₃ / mL solution )

           = ( 50 * 0.0100 / 100 mL )  = 0.005 M

Next determine the Ionic product ( Q )

Q = [ Ag⁺ ] [ IO⁻₃ ]

   = 0.001 * 0.005

   = 5 * 10⁻⁶  

Since the value of Q is > Ksp a precipitate ( IO⁻₃ )  will be formed after the completion of the precipitation reaction

Therefore the concentration of the excess  IO⁻₃  = 0.400 mmol / 100 mL

                                                                                 = 0.004 M

Second step : considering the initial and final concentrations

Initial concentrations ( mol/ L )                  Final concentrations ( mol/L )

[ Ag⁺ ] = 0 M                                                  [ Ag⁺ ]  = x

[ IO⁻₃ ] = 0.004 M                                          [ IO⁻₃ ] = 0.004 + x

Final step : Determine the equilibrium concentration of Ag in the solution

Ksp = 3 * 10⁻⁸ = [ Ag⁺ ]  [ IO⁻₃ ]

                      =  ( x ) ( 0.004 + x )

Therefore x = 7.5 * 10⁻⁶ ( Equilibrium concentration of Ag in the solution )

Hence we can conclude that The equilibrium concentration of Ag⁺ in the solution is : 7.5 * 10⁻⁶ M

Learn more about equilibrium concentration : https://brainly.com/question/13414142

Answer:

I say A not only because it's a repeat of B but because it also doesn't talk about in which direction the velocity is.

Explanation:

Hope this helped.

A brainliest is always appreciated.

Answer: true

Explanation: An atom does of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. Protons and neutrons have nearly equal masses, but in a way they DO differ in charge.

The age of the rock can be calculated from the half life of Uranium - 238. The age of the rock sample is 9 million years.

The term radioactivity refers to the sponteanous decay of a material which leads to the production of daughter nuclei. We know that uranium 238 decays to lead 206  with a half life of 4.5 billion years.

Using;

0.693/t1/2 = 2.303/t log(No/N)

t1/2 = half life of uranium 238

t = age of the rock sample

No = initial amount of uranium 238

N = amount of uranium 238 after time t

Now;

0.693/4.5 * 10^9 = 2.303/t log (No/0.25No)

0.693/4.5 * 10^9 = 2.303/t log(1/0.25)

0.693/4.5 * 10^9 =1.387/t

1.54 * 10^-10 = 1.387/t

t =  1.387/1.54 * 10^-10

t = 9 million years

The age of the rock sample is 9 million years.

Learn more about age of rock: https://brainly.com/question/276030

Balanced reaction is given by

[tex]\\ \rm\Rrightarrow 2C_4H_10+13O_2\longrightarrow 8O_2+10H_2O[/tex]

On both sides

Hence balanced

Molar mass of butane:-

Moles of Butane:-

#16

Moles of CO_2:-

Mass of CO_2:-

#17

Moles of O_2

Mass of O_2

Answer:

Independent variable: different alcohols

Dependent variable: red dye

Answer:

[tex]Molecular \: mass \: of \: MgSO_{4}.2H_{2}O\:, \\ \\ ⇝ 24 + 32 + 16 \times 4 + 2(2 \times 1 + 46) \\ \\ ⇝ 24 + 32 + 64 + 36 \\ \\ ⇝156 \: u[/tex]

[tex]\bold\pink{Percentage \: of \: substance \: in \: compound} \\ \\ \bold\pink{⇝ \frac{mass \: of \: substance}{mass \: of \: compound} \times 100}[/tex]

[tex]\% \: age \: of \: Sulphur \: (S) = \frac{32}{156} \times 100 \\ \\ ⇝0.205 \times 100 \\ \\ \fbox\blue{\:⇝ 20.5\%\:}[/tex]

hope helpful ~

Answer:

20.51%

Explanation:

Mass of S = 32g

Mass of MgSO₄ x 2H₂O = 24 + 32 + 64 + 36 = 56 + 100 = 156

Answer:

78.68g Na

121.32 Cl

Explanation:

This one is more easy than the wording makes it seem. Since there are 60.66g of sodium (Na) and 39.34g of Chlorine (Cl) it adds up to 100g, so in this case you can just double each amount, and get what each would be in a 200g sample.

Answer:

Al2(CO3)3 (A)

Explanation:

i think thats the answer

Aluminum carbonate is indeed a carbonate solution of aluminum that is intended for oral intake. It should be the carbonate salt type of aluminum that's also intended for oral consumption.

Therefore, the answer is "[tex]\bold{Al_2(CO_3)_3}[/tex] ".

Learn more:

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Answer:

The independent variable is the cause while the dependent variable is the effect.

Explanation:

Answer: A compound is a material formed by chemically bonding two or more chemical elements. The type of bond keeping elements in a compound together may vary: covalent bonds and ionic bonds are two common types. The elements are always present in fixed ratios in any compound.

Explanation:

Answer:

Jupiter

Biggest Planets In Our Solar System

Explanation:

hopes this help

Answer:

Explanation:

If the question is truly the biggest planet on earth, then the answer is earth.

But if the question is the biggest planet in the solar system, then it is Jupiter.

Answer:

Explanation:

Butane ⇒ Isobutane

ΔG = RT ln K

ΔG = - 18 + 15.9 = - 2.1 kJ / mol

- 2.1 x 10³ = 8.3 x 298 x lnK

lnK = .85

K = 2.33

[ isobutane ] / [ butane ]  = 2.33

isobutane / total mixture = 2.33 / 3.33 = .7

% of isobutane = 70 % .

70% is isobutane and 30 %  butane . Since equilibrium is tilted towards isobutane , it is more stable . Butane is straight chain and isobutane is branched chain compound .

Explanation:

45.8 grams of Fe2O3*(1 mole/159.69 g)= moles of Fe2O3

moles of Fe2O3 *(3 moles of O2/2 moles of Fe2O3)=moles of O2

moles of O2*(32.0g of O2/1mole)= mass of O2

Answer: Diamond is covalent crystal. It has the highest melting point because high energy covalent bonds hold the crystal together.

Explanation: Covalent bonds are very strong, so covalent network solids typically have the highest melting points out of all four types of solids.

Answer:

giant covalent solids

Ionic solids also have high melting points, often over 1000 degrees but they can vary. Some are often low enough to melt in the lab with a Bunsen burner:

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 10 cc

density = 7.8 g/cc

So we have

mass = 7.8 × 10

We have the final answer as

Hope this helps you

Answer:

45.35 converts to: 115.189cm

Explanation:

Answer:

the two careers in science are :

1) Engineer

2)Doctor

Explanation:

They believing that all things consists of that from which they were originally generated is how they arrived at such conclusion.

This is a Greek word which refers to the origins and beginnings of n object or organism.

The earliest philosophers arrived at the conclusion that "this primary entity(arche) always persists as a result of all things comprising of that which they were originally generated .

Read more about Arche here https://brainly.com/question/1658810

The presence of hydrogen and hydroxyl ions determines the acidic and basic nature of a solution.

The use of the pH scale is one way of determining the acidic and basic nature of solution. If the pH of a solution is less than 7, it is considered as acidic and if the pH is 7, the solution is neutral.

While if the pH is greater than 7,the solution is basic so we can conclude that the presence of hydrogen and hydroxyl ions determines the acidic and basic nature of a solution.

Learn more about substance here: https://brainly.com/question/2901507

Carbon, Oxygen and Chlorine all have eight valence electrons while hydrogen has two valence electrons.

The term Lewis structure refers to the structure of a molecule in which valence electrons are shown as dots and sometimes a dash is used to show bonding between two atoms.

In the molecule CHOCl, we have the Lewis structure as shown in the image attached to this answer. Carbon, Oxygen and Chlorine all have eight valence electrons while hydrogen has two valence electrons. Therefore, all the atoms in the molecue obey the octet rule.

Learn more anbout Lewis structure: https://brainly.com/question/4144781

Answer:

 Exponential

Explanation:

Because its the numbers/anything that is becoming more and more rapid.