a student requires to prepare 500ml of 0.1M potassium dichromate (vii) from 0.250M solution must be diluted to 500ml​

Answer:

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Explanation:

Answer:

...........................

Answer:

Its positive charge is attracted to the negative charge of Cl–.

Explanation:

The best description of why NH₄⁺ forms an ionic bond with Cl⁻ is that its positive charge is attracted to the negative charge of Cl⁻.

An ionic bond forms as a result of transfer of electrons. As a result the seemingly metal ion is attracted to the negative non-metal ion.

The electrostatic force of attraction between these ions is the ionic or electrovalent bond.

So, the attraction between these opposite charges will form the ionic bond.

Answer:

B: Its positive charge is attracted to the negative charge of Cl–

Explanation:

right on edge2021

Answer:

answer of this question is option. 3. compound 1 is ionic ,and 2 is molecular

Compound 1 is ionic and compound 2 is molecular. The correct option is 3) Compound 1 is ionic, and compound 2 is molecular

From the question,

We are to classify the compounds according to the information provided in the table

First,

We will list the properties of ionic and molecular compounds

Properties of ionic compounds

Properties of molecular compounds

In the given table,

Compound 1 has high melting and boiling points, and it is a good electrical conductor. Therefore, compound 1 is ionic

Compound 2 has low melting and boiling points, and it is a poor electrical conductor. Therefore, compound 2 is molecular

Hence, Compound 1 is ionic and compound 2 is molecular. The correct option is 3) Compound 1 is ionic, and compound 2 is molecular

Learn more on properties of ionic and molecular compounds here: https://brainly.com/question/13878434

Answer:

If a negative number is raised to an even power, the result will be positive. If a negative number is raised to an odd power, the result will be negative. The negative number must be enclosed by parentheses to have the exponent apply to the negative term.

Explanation:

Answer:

uses of photosynthesies:

Explanation:

In photosynthesis ENERGY from light is used to convert CARBONDIOXDE and water into glucose and oxygen for 6 carbon and 6 water molecules, 1 glucosed and 6 oxygen molecules are produced.

What is photosynthesis?

The process by which green plants and some other organisms use sunlight to synthesize nutrients for their nourishment is called Photosynthesis.

Some requirements of photosynthesis to take place :-

Result ( product ) of photosynthesis :-

When the process of photosynthesis is completed, it releases Oxygen as a by-product.

Chemical Equation for Photosynthesis :-

[tex] \sf6CO_2 + 6H_2O \binom{sunlight \: and \: chorophyll}{ \rightarrow} C_6H _ {12} {O _6 + 6O_2} \uparrow[/tex]

Scroll from right to left to see the whole solution.

Answer:

Pressure is often defined as a measure of force applied on an area, or over a unit area.

Explanation:

Answer:

0.0064 qt

Explanation:

Given data:

Density of mercury = 13.6 g/cm³

Mass of mercury = 83.0 g

How many quarts mercury have = ?

Solution:

First of all we will calculate the volume in cm³.

d = m/v

13.6 g/cm³ = 83.0 g / volume

Volume = 83.0 g /  13.6 g/cm³

Volume = 6.1 cm³

cm³ to L:

6.1 cm³ × 1 L / 1000  cm³

0.0061 L

In quarts:

1 L = 1.06 qt

0.0061 L × 1.06 qt / 1 L

0.0064 qt

Answer:

True

Explanation:

Answer: True

Explanation:

Answer:

So we are given with the mass while we are asked for the amount of volume. So this means, we must need an information on the density. From literature, the density of human fat is 0.918 g/cm³. Convert grams to lb by the conversion that 1,000 g = 2.2 lbs.

Density = 0.918 g/cm³ * (2.2 lbs/1,000 g) = 0.0020196 lb/cm³

Volume = Mass/Density = 12.2 lb / 0.0020196 lb/cm³

Volume = 6,040.8 cm³

Answer: A

Explanation: cytokinesis is in the M phase.... Mitosis is followed by cytokinesis (cell separation)

Answer:

A. Cytokinesis

Explanation:

B. doesn't make sense it's for math

C. Is for plants not cells

D. is the action of breathing

So, A is the most likely answer.

Hope I helped!

Answer:

The Industrial Revolution was a period of great industrialization that began in the late 18th century in Britain, leading to massive population growth and agricultural innovations, which laid the foundation for increased productivity, both with increased labor and a larger market for the products. There was a revolution in the production methods of the textile industry, especially with the advent of the steam engine and urban development, the influx of people from the countryside to the cities meant that there was an abundance of labor, which laid the foundation for the industrial cities of the nineteenth century.  The steam engine was also used in the new generation of transport, in locomotives and steamships. With the advent of steel as a building material along with a series of new discoveries in communication technology in the second half of the 19th century, the tone was set for the continued technological development of the 20th century.

Answer:

the Ans is H2O2

Explanation:

THANKS.............

Answer:

i. 3 moles.

ii. 132.03 grams.

iii. 105.6 grams.

Explanation:

Hello!

In this case, given the balanced chemical reaction, we can proceed as follows:

i. By starting with 5 moles of oxygen, via the 5:3 mole ratio we compute the produced moles of CO2:

[tex]n_{CO_2}=5molO_2*\frac{3molCO_2}{5molO_2} =3molCO_2[/tex]

ii. Now, since we have previously computed the moles of CO2 from the same moles of oxygen, by using its molar mass (44.02 g/mol), we obtain:

[tex]m_{CO_2}=3molCO_2*\frac{44.01gCO_2}{1molCO_2} =132.03gCO_2[/tex]

iii. Now, we need to combine the previously used two proportional factors for the calculation of the mass of CO2 from 128.00 grams of oxygen (molar mass 32.00 g/mol):

[tex]m_{CO_2}=128.00gO_2*\frac{1molO_2}{32.00gCO_2}*\frac{3molCO_2}{5molO_2}*\frac{44.01gCO_2}{1molCO_2}\\\\m_{CO_2}=105.6gCO_2[/tex]

Best regards!

The main differentiation between given windows is that in normal publication window we can edit the document after generation also and the story editor window in desktop publishing we can not able to edit after generation.

Windows in the computer world is a part of the graphical user interface (GUI), which is a separate viewing area on the display of monitor where they allow multiple viewing area.

Hence, in the above paragraph differentiation is given.

To know more about windows, visit the below link:

https://brainly.com/question/25554117

Answer:

577.6 mmHg

Explanation:

What is the conversion between atm (standard atmosphere) and mmHg (millimeters of mercury)?

Multiply the atm amount by 760 to get the mmHg amount.

19/25 * 760/1

19/5 * 152/1

(19*152)/5

2888/5

577 3/5 or 577.6 mmHg

The average atomic mass unit of Silicon : 28.0774

Given

Isotopes of Si(Silicon-28, Silicon-29, Silicon-30)

Required

The average atomic mass

Solution

Isotopes are elements that have the same Atomic Number (Proton)

Atomic mass is the average atomic mass of all its isotopes

Avg. atomic mass = %mass.isotopes 1 + %mass.isotopes 2...etc

Input the values :

Avg atomic mass = (0.922 x 27.977) + (0.047 x 28.976) + (0.031 x 29.974)

Avg atomic mass = 28.0774

Answer:

a solution color becoming less intense  due to dilution- is not an evidence of a chemical reaction

bubbles (gas formation) - evidence of a chemical reaction

explosion or fire - evidence of a chemical reaction

changes in color- evidence of a chemical reaction

precipitation- evidence of a chemical reaction

changes in temperature - evidence of a chemical reaction

a solid liquifying - is not an evidence of a chemical reaction

solution colors mixing - is not an evidence of a chemical reaction

Explanation:

A chemical change is not easily reversible and yields new substances. It is often accompanied by a loss or gain of heat.

In the answer section, i have shown some evidences that lead us to conclude that a chemical reaction has taken place. The occurrence of a chemical change often goes with the formation of new substances as earlier stated and any of these signs may accompany the process.

For instance, when a metal is dropped in dilute acid solution, bubble of hydrogen gas indicates that a chemical reaction has taken place.

Answer:

K₂CrO₅

Explanation:

The empirical formula is the simplest formula of a compound. To find the empirical formula, we follow the procedure below:

Elements                         Potassium                 Chromium         Oxygen

Mass                                  6.52                             4.34                  5.34

Molar mass                          39                               60                      16

Number of moles             6.52/39                     4.34/60             5.34/16

                                             0.167                          0.072              0.333

Divide through by

the smallest                      0.167/0.072             0.072/0.072          0.333/0.072

                                            2.3                               1                                4.6

                                             2                                 1                                  5

Empirical formula K₂CrO₅

Answer:

Explanation: Avogadro number,N, = 6.02214076*10^23per mole —> 22.71L

—>( 7.41*10^26/N)*22.71 = 22.79*10^3 = 22,790L

Answer:

See explanation

Explanation:

Given that;

E = hc/λ

h = 6.63 * 10^-34 Js

c = 3 * 10^8 ms-1

λ = ?

E = 3.978 * 10^-19 J

λ = hc/E

λ = 6.63 * 10^-34 * 3 * 10^8 /3.978 * 10^-19

λ = 19.89 * 10^-26/3.978 * 10^-19

λ = 5 * 10^-7 m The colour is green

2. E = hc/λ

E=  6.63 * 10^-34 * 3 * 10^8 /1000 * 10^-9

E = 1.989 * 10^-19 J

But

E = hf

f = E/h

f =  1.989 * 10^-19/6.63 * 10^-34

f = 3 * 10^14 Hz The radiation is infrared

3. E = hc/λ

λ= hc/E

λ= 6.63 * 10^-34 *  3 * 10^8 /2.0 * 10^-14

λ= 995 * 10^-14 m This is gamma radiation

4. E = hc/λ

E=6.63 * 10^-34 *  3 * 10^8 /620 * 10^-9

E = 3.2 * 10^-19 J

5. E = hf

E= 6.63 * 10^-34 * 2 * 10^17

E = 1326 * 10^-19 J

E = hc/λ

λ= hc/E

λ= 6.63 * 10^-34 * 3 * 10^8 /1326 * 10^-19 = 15 * 10^-9

This is ultraviolet radiation

Answer:

C. Physical Change

Explanation:

Peeling a banana is not changing the banana's structure, it's still the same banana, but it looks different, which is a chemical change! Hope I helped!

Answer:

A. Warning

Explanation:

Out of all said choices, the best choice would be warning since it would fit the sentence the most.

"A Warning notifies you that danger is present." compared to:

"A Hazard notifies you that danger is present."

"A Safety notifies you that danger is present."

"A Danger notifies you that danger is present."

Answer:

US₂

Explanation:

Uranium sulfide (US₂)

Uranium atomic symbol = U

Sulfur atomic symbol = S

Uranium valency = +4

Sulfur valency = -2

So;

Uranium sulfide (US₂)

Answer:

15.12g

Explanation:

Given parameters:

Number of moles  = 0.4moles

Unknown:

Mass of the compound  = ?

Solution:

To solve this problem;

   Mass  = number of moles x molar mass

 Molar mass of NaBH₄   = 23 + 10.8 + 4(1)  = 37.8g/mol

 Mass of the compound  = 0.4 x 37.8  = 15.12g

Answer:

The answer is 15.12 g but if you are taking this test on ck12 make sure you round it to 15 like it says on the directions :) good luck