A pupil adds 5 cm of 12 mol.dm sulphuric acids to make a 250 cmº solution. Calculate the
concentration of the diluted acid.

Answer:

1.CBr4

2.CIF

Explanation:

Covalent compound are formed by sharing of electron and ionic compound formed by complete transfer of electron. The chemical formula for Carbon tetrabromide is CBr₄ and for Chlorine monofluoride is ClF.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Ionic compounds are more stronger than covalent compound. Ionic compounds have higher melting and boiling point than covalent compounds.

The chemical formula for Carbon tetrabromide is CBr₄, tetra means four. The chemical formula for Chlorine monofluoride is ClF, mono means one.

Therefore, the chemical formula for Carbon tetrabromide is CBr₄ and for  Chlorine monofluoride is ClF.

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Answer: [tex]7.36\times 10^{23}[/tex] number of molecules of chlorine gas are needed.

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)

Given mass of sodium chloride = 35.7 g

Molar mass of sodium chloride = 58.44 g/mol

Plugging values in equation 1:

[tex]\text{Moles of sodium chloride}=\frac{35.7g}{58.44g/mol}=0.611 mol[/tex]

The given chemical equation follows:

[tex]2Na+Cl_2\rightarrow 2NaCl[/tex]

By the stoichiometry of the reaction:

If 1 mole of sodium chloride is produced from 2 moles of chlorine gas

So, 0.611 moles of sodium chloride will be produced from = [tex]\frac{2}{1}\times 0.611=1.222mol[/tex] of chlorine gas

According to the mole concept:

1 mole of a compound contains [tex]6.022\times 10^{23}[/tex] number of molecules

So, 1.222 moles of chlorine gas will contain = [tex]\frac{6.022\times 10^{23}}{1mol}\times 1.222mol=7.36\times 10^{23}[/tex] number of molecules

Hence, [tex]7.36\times 10^{23}[/tex] number of molecules of chlorine gas is needed.

Answer:

If you wash your hands with soap, the soap molecules act as a link between the water you're washing with and the oil on your skin.

Explanation:

Answer:

I think it will be the answer

2.5 x 10-2 mol

I hope it help you

Answer:

The mouth begins the process of digestion by mechanically breaking food into smaller pieces.

Explanation:

Digestion is a crucial process that involves the break down of complex food molecules into simpler ones that are assimilable by the body. The process of digestion in humans, for example, is said to begin in the MOUTH where the food enters through.

The mouth via the use of teeth helps the initially break down the food particles using mechanical/physical method. This further helps the break down of the food into tiny particles before they are acted on enzymatically.

Answer:

CH₂

Explanation:

From the question given above, the following data were obtained:

Mass of compound = 1 g

Mass of CO₂ = 3.14 g

Mass of H₂O = 1.29 g

Empirical formula =?

Next, we shall determine the mass of Carbon and hydrogen present in the compound. This can be obtained as follow:

For Carbon, C:

Mass of CO₂ = 3.14 g

Molar mass of CO₂ = 12 + (2×16)

= 12 + 32

= 44 g/mol

Molar mass of C = 12 g/mol

Mass of C =?

Mass of C = molar mass of C/ Molar mass of CO₂ × Mass of CO₂

Mass of C = 12/44 × 3.14

Mass of C = 0.86 g

For hydrogen, H:

Mass of C = 0.86 g

Mass of compound = 1 g

Mass of H =?

Mass of H = (Mass of compound) – (mass of C)

Mass of H = 1 – 0.86

Mass of H = 0.14 g

Finally, we shall determine the empirical formula of the cyclopropane. This can be obtained as follow:

Mass of C = 0.86 g

Mass of H = 0.14 g

Divide by their molar mass

C = 0.86 / 12 = 0.07

H = 0.14 / 1 = 0.14

Divide by the smallest

C = 0.07 / 0.07 = 1

H = 0.14 / 0.07 = 2

Thus, the empirical formula of cyclopropane is CH₂

2K(s) + 2H2O(l) → 2KOH(aq) + H2(g)

Answer:

C. The rate of cellular respiration in the tank was much higher than

the rate of photosynthesis

Explanation:

In nature, cellular respiration and photosynthesis are opposite metabolic reactions. Cellular respiration, which is the process of releasing energy, requires oxygen while photosynthesis, which is the process of manufacturing foods by green plants, releases oxygen into the atmosphere. The two equations are as follows:

Photosynthesis:

6CO2 + 6H2O → C6H1206 + 6O2 (oxygen released)

Respiration:

C6H1206 + 6O2 (oxygen used) → 6CO2 + 6H2O

According to this question, 10 snails and two small aquatic plants were added to a closed glass tank half full with water. It was observed that all the snails died. This is most likely due to the fact that the rate of cellular respiration in the tank was much higher than the rate of photosynthesis.

In other words, the usage of oxygen via cellular respiration was much higher than the release of oxygen via photosynthesis.

Answer:

1. Snails carry out respiration only

2. Aquatic plants carry out both respiration and photosynthesis Although the aquatic plants can absorb carbon dioxide and release oxygen through photosynthesis, the amount of snail is much more than that of the aquatic plants.

During night time,the absence of light prevent the plants from carrying out photosynthesis. No oxygen is released at this time. There is a net release of carbon dioxide in the closed system and hence the snail died of suffocation.

Answer:

26.98°C

Explanation:

Applying,

Q = cm(t₂-t₁)................ Equation 1

Where Q = Heat transferred to the soil, c = specific heat capacity of dry soil, m = mass of the soil, t₂ = final temperature, t₁ = initial temperature.

From the question,

Given: Q = 11 kJ = 11000 J, m = 2300 g = 2.3 kg, t₁ = 21°C

Constant: c = 800 J/kg.°C

Substitute these values into equation 1

11000 = 800×2.3(t₂-21)

Solving for t₂

t₂-21 = 11000/(800×2.3)

t₂-21 = 11000/1840

t₂-21 = 5.98

t₂ = 5.98+21

t₂ = 26.98°C

Answer:

D

Explanation:

because moles = mass /mr

so 81/18(mr of H2O=2+16)

moles =4.5

hope this helps:)

Answer: No

Explanation: We can not call all iconic compounds covalent.

Answer:

an iconic bond is formed by the complete transfer of some electrons from one atom to another

Explanation:

the atom losing one or more electrons become a cation. a positively charged ion the atom gaining one or more electrons become an anion. a negatively charged ion

Answer:

Molarity can be used to calculate the volume of solvent or the amount of solute. The relationship between two solutions with the same amount of moles of solute can be represented by the formula c1V1 = c2V2, where c is concentration and V is volume.

The relationship between Molarity and volume of a solution is : ( B ) They are inversely related

Molarity is the number of moles of solute in unit of volume of the solution ( usually per liter ). Molarity is calculated by dividing the number of moles of a solute ( n ) by the volume of the solution.

Molarity = n / v .

Therefore we can conclude that the relationship between Molarity and volume is that they are inversely related.

Learn more about Molarity : https://brainly.com/question/17138838

QUESTION

WHY DOES TEMPERATURE REMAIN CONSTANT DURING CHANGE OF STATE

[tex]\huge\mathbb{\red A \pink{N}\purple{S} \blue{W} \orange{ER}}[/tex]

[tex]\orange{\underline{\huge{\bold{\textit{\green{\bf{REASON}}}}}}}[/tex]

The energy in the form of heat which is supplied to the body is used in the breaking of the bonds to change its State. when changing from low energy state to high energy state

The energy in the form of heat which is released out is released when bonds r formed to change the state . when changing from high energy state to low energy state.

so net change in temperature is zero bez the heat received and released is always used.

Answer:

4. C2H4, C3H6, C4H8

this is the alkane homologous series of hydrocarbons.

Their general formula is CnH2n

you can check this fits for all these compounds

put n = 1, 2, 3 and so on

Answer:

9 atoms

Explanation:

Ca=1

Cl=2

O=6

add them all

answer

cl atom is 2

ca atom is 1

o atom is 6

mmmmmmmmmmhhhhhhhhhhhhhhhhhhhh

Answer:

0.111

Explanation:

Step 1: Calculate the moles corresponding to 23.2 g of ethanol

The molar mass of C₂H₅OH is 46 g/mol.

23.2 g × 1 mol/46 g = 0.504 mol

Step 2: Calculate the moles corresponding to 73.1 g of water

The molar mass of H₂O is 18 g/mol.

73.1 g × 1 mol/18 g = 4.06 mol

Step 3: Calculate the total number of moles

n = nC₂H₅OH + nH₂O = 0.504 mol + 4.06 mol = 4.56 mol

Step 4: Calculate the mole fraction of ethanol

We will use the following expression.

Χ(C₂H₅OH) = nC₂H₅OH / n

Χ(C₂H₅OH) = 0.504 mol / 4.56 mol = 0.111

Answer:

Zinc

Zinc blende

(ZnS)

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

Lead

Galena

(PbS)

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

Mercury

Cinnabar

(HgS)

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

Copper

Copper glance

(Cu2S)

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

Explanation:

Had to learn this for a test

Also, I plead the 5th

Answer:high pressure system and cold fronts

Explanation:

High pressure develops in areas where air cools and sinks. This usually causes fair weather with cool temperatures and few clouds.

Cold fronts occur when warm air is pushed up into the atmosphere by colder air at the ground. These fronts tend to move faster than the other types of fronts and are associated with the most violent types of weather such as severe and super cell thunderstorms, although any type of front can produce these same storms. After a cold front passes it is common to have clear skies and a dramatic change in wind direction on top of the cooler air associated with the front itself.

Answer:

This relates to Boyle's Law.

Pressure is inversely related to Volume

Its is an Indirect Relationship. When One increases....The other decreases.

OPTION B IS YOUR ANSWER.

HAVE A GREAT DAY!

Answer:

2HNO3 (aq) + Na2CO3 (aq) → 2NaNO3 (aq) + CO2 (g) + H2O (l)

Explanation:

This question is asking to write and balance an equation between between aqueous sodium carbonate (Na2CO3) and aqueous nitric acid (HNO3). The equation is as follows:

HNO3 (aq) + Na2CO3 (aq) → NaNO3 (aq) + CO2 (g) + H2O (l)

However, this equation is not balanced as the number of atoms of each element must be the same on both sides of the equation. To balance the equation, one will make use of coefficients as follows:

2HNO3 (aq) + Na2CO3 (aq) → 2NaNO3 (aq) + CO2 (g) + H2O (l)

the answer is 2 and 4 earth's atmosphere containing oxygen and nitrogen is essential for life and the surface temperature is also essential

Answer:

1. physical property

2. chemical property

3. physical change

hope this helps

Answer:

D)subscript of C in molecular formula = n x subscript of C in empirical formula

Explanation:

THIS IS THE COMPLETE QUESTION BELOW;

.The empirical formula for a compound is CH2. If n is a whole number, which shows a correct relationship between the molecular formula and the empirical formula? a)<br /><br /> empirical formula mass / molecular mass = n<br /><br /> B) molecular mass = element mass / empirical formula mass ´ 100<br /><br /> c) subscript of H in empirical formula = 2  subscript of H in molecular formula<br /><br /> D) subscript of C in molecular formula = n  subscript of C in empirical formula<br /><br />

An empirical formula can be regarded as "shorten form" of a molecular formula. Instance of this is

A compounds CH4, C2H8, C4H12... with empirical formula of CH4. In this case a constant "n" represent the difference that exist between empirical formula and molecular formula, "n" which is a whole number, molecular formula is the numerator.

Therefore, subscript of C in molecular formula = n x subscript of C in empirical formula

Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 10 × 5

We have the final answer as

Hope this helps you