Kevin was carrying out the following steps as part of an experiment.


What was the topic of this experiment?

A. The water cycle
B. The circulation of global winds
C. The formation of ocean currents
D. The formation of a hurricane over water

Answer:

201 ÷ 3 = 67mph

Explanation:

let me know if you want me to explain more

Answer:

20.4g NaOH

Explanation:

Because, trust the drip, trust the drip

Answer:

A) 2 upper Hg upper O (s) right arrow 2 upper H g (l) plus upper O subscript 2 (g).

Explanation:

Elements or compounds can be combined or degraded to form new substances called PRODUCTS. In chemistry, the state in which the substances reacting or being formed are is represented using signs in brackets.

(s) means solid state

(aq) means aqueous state

(l) means liquid state

According to this question, in the reaction between: 2 upper Hg upper O (s) right arrow 2 upper H g (l) plus upper O subscript 2 (g). This can be chemically written as:

2HgO (s) → 2Hg (l) + O2 (g)

From this equation, it can be observed that Mercury (Hg) and oxygen (02), which are the products are in a liquid and gaseous state respectively as shown by the sign.

Answer:

Other person is correct it is A.

Explanation:

Answer:

8kJ/mol

Explanation:

since the forward reaction is -8kJ/mol, the backward reaction has the same enthalphy but reversed

The enthalpy of the reaction is 8kj/mol because it is a reversed reaction.

Since the forward reaction is -8kj/mol, thebackward enthalpy will be 8kj/mol.

Enthalpy is refers to the total sum of the internal energy that is sum up to the product of the pressure and volume in a system of reaction.

Therefore, The enthalpy of the reaction is 8kj/mol because it is a reversed reaction. Since the forward reaction is -8kj/mol, the backward enthalpy will be 8kj/mol.

Learn more about enthalpy below.

https://brainly.com/question/11628413

#SPJ2

Answer:

Explanation:

PV / RT =  n , n is number of moles

Total pressure  = 96400 Pa

vapour pressure = 23.8 mm of Hg

= .0238 x 13.6 x 10³ x 10 Pa = 3236.8 Pa

Pressure of hydrogen gas P = 96400 - 3236.8

= 93163.2 Pa

n = 93163.2 x .0251 / 8.31 x 298

= .944 moles of hydrogen gas is produced

moles of magnesium reacted = .944

grams of magnesium reacted = .944 x 24 = 22.66 grams .

Answer:

The density of tin is 7.31 g/cm³.

Explanation:

Given that the formula of density is D = m/v where m represents mass and v is volume :

D = 16.52/2.26

D = 7.31 g/cm³ (3sf)

Answer:

Plates

Explanation:

The Earth's crust is broken up into sections called plates. Tectonic plates are on the mantle which allow them to move.

Answer:

D i think. Not sure.

Explanation:

I mean i just did it myself, and i dont really do chemistry, but I would say D sorrry if i made you get it wrong!!

Answer:

C. Heat transfers thermal energy from the student's hand to the ice.

Explanation:

I got it right on my test apix

Answer:

It is D. a second set of chromosomes is produced

Explanation:

Hope this helped have an amazing day!

Answer:

I havent the foggiest.

Explanation:

Answer:

Explanation:

I havent the foggies

Answer:

eight strong bonds to the atoms that it touches and six weaker bonds to the atoms it almost touches. This makes it easier to understand why a metal might prefer the body-centered cubic structure to the hexagonal or cubic closest-packed structure.

Answer:

[tex]H_3PO_4(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+H_2PO_4^{-}(aq); \ Ka_1[/tex]

[tex]H_2PO_4^{-}(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+HPO_4^{-2}(aq); \ Ka_2[/tex]

[tex]HPO_4^{-2}(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+PO_4^{-3}(aq); \ Ka_3[/tex]

Explanation:

Hello!

In this case, since the phosphoric acid is a triprotic acid, we infer it has three stepwise ionization reactions in which one hydrogen ion is released at each step, considering they are undergone due to the presence of water, thus, we proceed as follows:

[tex]H_3PO_4(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+H_2PO_4^{-}(aq); \ Ka_1[/tex]

[tex]H_2PO_4^{-}(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+HPO_4^{-2}(aq); \ Ka_2[/tex]

[tex]HPO_4^{-2}(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+PO_4^{-3}(aq); \ Ka_3[/tex]

Moreover, notice each step has a different acid dissociation constant, which are quantified in the following order:

Ka1 > Ka2 > Ka3

Best regards!

Mass of CaCl₂ = 0.732 g

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

[tex]\tt \%(m/v)\rightarrow 12\%=\dfrac{mass~CaCl_2}{volume~of~solution}\times 100\%\\\\mass~CaCl_2=12\%\times 6.1\div 100\%\\\\mass~CaCl_2=0.732~g[/tex]

Answer:

(a) Acid

(b) Base

(c) Acid

(d) Base

Explanation:

According to the Arrhenius acid-base theory:

(a) H₂SO₄ is an acid according to the following equation:

H₂SO₄(aq) ⇒ 2 H⁺(aq) + SO₄²⁻(aq)

(b) Sr(OH)₂ is a base according to the following equation:

Sr(OH)₂(aq) ⇄ Sr²⁺(aq) + 2 OH⁻(aq)

(c) HBr is an acid according to the following equation:

HBr(aq) ⇒ H⁺(aq) + Br⁻(aq)

(d) NaOH is a base according to the following equation:

NaOH(aq) ⇒ Na⁺(aq) + OH⁻(aq)

ANSWER: Surface Fresh Water

Humans only use 0.3% of the water on earth. The other 99.7 percent is in the oceans, soils, icecaps, and floating in the atmosphere.

Answer:

Curd, lemon juice, orange juice and vinegar taste sour. These substances taste sour because they contain acids. The chemical nature of such substances is acidic. The word acid comes from the Latin word acere which means sour.

Answer:

It is important for you find a job that matches your skills, interests and abilities when searching for a career because then you will be satisfied with what you do and your career because since it fits your wants, skills, interests and abilities you will do a great job while working and completing tasks. Overall you'll be happy because that's the perfect job for you.

Explanation:

Answer:

A. Atmosphere

Explanation:

hope this helps

Answer:

C. A law passed by the British parliament that prohibited colonial movements west of the Appalachian Mountains.

Explanation:

Answer:

✔ Cumberland Gap

was a natural mountain pass through the Appalachian Mountains.

This is the Correct Answer!

This might not be the same Question. This is history 5th Unit.

Answer:

3.72 mol Hg

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

D = 13.6 g/mL

54.8 mL Hg

Step 2: Identify Conversions

Molar Mass of Hg - 200.59 g/mol

Step 3: Find

13.6 g/mL = x g / 54.8 mL

x = 745.28 g Hg

Step 4: Convert

[tex]745.28 \ g \ Hg(\frac{1 \ mol \ Hg}{200.59 \ g \ Hg} )[/tex] = 3.71544 mol Hg

Step 5: Check

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

3.71544 mol Hg ≈ 3.72 mol Hg

Answer:

You could color it different. Explain in a picture the difference. There are so many different variety's.

Explanation:

Most of the elements to the left of the stair-step line in the periodic table exist as liquids in the periodic table and the correct option is option B.

The periodic table is a tabular arrangement of the chemical elements by increasing atomic number which displays the elements so that one may see trends in their properties.

Elements are arranged from left to right and top to bottom in the order of their increasing atomic numbers. Thus,

Therefore, Most of the elements to the left of the stair-step line in the periodic table exist as liquids in the periodic table and the correct option is option B.

Learn more about Periodic Table, here:

https://brainly.com/question/11155928

#SPJ3

Answer:

300g of water because its a larger amount

Explanation:

Answer:

Percent yield = 91%

Explanation:

Given data:

Percent yield of TiO₂ = ?

Actual yield = 10.2 g

Mass of TiCl₄ react = 25.7 g

Solution:

Chemical equation:

TiCl₄  + O₂   →    TiO₂  + 2Cl₂

Number of moles of TiCl₄:

Number of moles = mass/molar mass

Number of moles = 25.7 g/ 189.7 g/mol

Number of moles = 0.14 mol

Now we will compare the moles of  TiCl₄  and TiO₂.

                       TiCl₄           :            TiO₂

                         1                :              1

                         0.14           :              0.14

Theoretical yield:

Mass = number of moles ×molar mass

Mass = 0.14 mol × 79.86 g/mol

Mass = 11.2 g

Percent yield:

Percent yield = [actual yield / theoretical yield ]  × 100

Percent yield = [10.2 g / 11.2 g ]× 100

Percent yield = 91%

Answer:

there gravitational force is very less to pull the weight of a person.

Two students who stand close to each other don't get pulled closer as a

result of gravitational force because the magnitude of the force is small.

Gravitational force acts on all objects on Earth but the force exerted is very

small as a result of the masses of the students being very small as to when

compared with that of the earth.

The large difference in mass of the student and earth is the reason why the

effect of the force is very little and unable to move them closer.

Read more on https://brainly.com/question/19332619

Answer:

9.91 X 10^-5 or 0.000099 mol

Explanation: