Answer:
Chemistry is essential for meeting our basic needs of food, clothing, shelter, health, energy and clear air, water and soilChemistry helps you to understand the world around you Chemistry is a heart of cooking A command of chemistry can keep you safeSome important achievements of chemistry includes discovery of oxygen ;Atomic Theory; Atoms Combine Into Molecules ;Synthesis of Urea; Chemical Structure ; Periodic Table of the Elements; Electricity Transforms Chemicals ; The Electron etc.
Chemistry is a field of science which deals with the chemicals present in laboratory or in our environment o related to human body also.
There are main 3 branches of chemistry that is organic and inorganic and physical chemistry some others are too like analytical chemistry ,industrial chemistry , pharmaceutical chemistry.
Organic chemistry deals with the carbon compounds and hydrogen compound inorganic chemistry deals with the elements of periodic table and pharmaceutical makes medicines for human health care. The reasons for people to pursue discoveries in chemistry because it is the most important part of daily life and related to the human health too.
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The complete question
Mention some important achievements of chemistry
Which element naturally occurs as a diatomic molecule?.
Answer:
There are 7 diatomic elements: hydrogen, nitrogen, oxygen, flourine, chlorine, iodine and bromine
Chemical energy is converted directly into electrical energy in.
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galvanic cell.What is the ratio of urms to ump for a certain gas at a given temperature?
The relative ratio, uav : ump : urms of a gas at a given temperature is 56 / 22 : 2 : 3.
What is temperature?Temperature is the measurement of hotness or coldness of a body. It shows the direction of flow of heat.
The relative rate (RR), also known as a rate ratio, is the ratio of the disease or death incidence rate in the exposed group to the disease or death incidence rate in the unexposed group.
Thus, the relative ratio, uav : ump : urms of a gas at a given temperature is 56 / 22 : 2 : 3.
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What is the cell reaction for the voltaic cell cr(s) | cr3 (aq) || cl–(aq) | cl2(g) | pt?
The cell reaction for the voltaic cell is 2Cr(s) + 3Cl₂(g) → 2Cr₃ + (aq) + 6Cl⁻ (aq). The correct option is d.
What is a voltaic cell?A voltaic cell is an electrochemical cell that generates electricity through a chemical reaction.
A voltaic cell's most important components are: The anode is an electrode that undergoes oxidation. The cathode is an electrode that undergoes reduction.
Thus, the correct option is d, 2Cr(s) + 3Cl₂(g) → 2Cr₃ + (aq) + 6Cl⁻ (aq).
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What volume of KI solution of concentration of 3 M would use to make 0.3L of KI solution of 1.25 M?
Taking into account the definition of dilution, a volume of KI solution of 0.125 L of concentration of 3 M would use to make 0.3L of KI solution of 1.25 M.
What is DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeInitial volumeIn this case, you know:
Ci= 3 MVi= ?Cf= 1.25 MVf= 0.3 LReplacing in the definition of dilution:
3 M× Vi= 1.25 M× 0.3 L
Solving:
Vi= (1.25 M× 0.3 L)÷ 3 M
Vi= 0.125 L
In summary, a volume of KI solution of 0.125 L of concentration of 3 M would use to make 0.3L of KI solution of 1.25 M.
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Which of the following statements correctly explains how latitude affects temperature?
1.Places that are closer to the equator receive more direct sunlight and have warmer temperatures.
2.The equator is an imaginary line drawn around the middle of the earth but has nothing to do with temperature.
3.laces that are far from the equator have warmer temperatures.
Answer:
It's 1, places that are closer to the equator receive more direct sunlight and have
Explanation:
What happens when the temperature of the air cools.
Sorry this is late but the molecules in the substance will move much slower and take up less place as a molecule that moves faster will take up more space
Hope this helps :))
What is the ph of a solution that has a [h ] = 0. 0039 m?
The pH of a solution that has a H⁺ ion concentration is 0.0039M is 2.4.
What is pH?pH of any solution gives idea about the acidity or basicity of solution and it will be calculated as:
pH = -log[H⁺]
Given that, concentration of H⁺ ion = 0.0039 M
On putting tis value in pH equation, we get
pH = -log(0.0039)
pH = -(-2.4) = 2.4
Hence required value of pH is 2.4.
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he students in the picture below are using a globe and a lamp to model the Sun and the Earth.
If the model Earth acts the same as the real Earth, what will happen as the students spin the model?
A.
A new year will start each time the model Earth makes a complete turn.
B.
Different parts of the model Earth will have different seasons.
C.
All of the model Earth will have daytime at the same time.
D.
Some parts of the model Earth will have daytime and some will have night.
Answer:
D
Explanation:
1/2 will be lit with 'daylight' and the other half will be dark
Art a the ph of a 0. 25 m aqueous solution of hydrofluoric acid, hf, at 25. 0 °c is 2. 3. What is the value of ka for hf
The value of [tex]K_{a}[/tex] for HF is, 3.5 x [tex]10^{-4} M[/tex]
What is an aqueous solution?The aqueous solution definition means simply that something has been dissolved in water. The aqueous symbol is (aq). Aqueous solution definition: something is dissolved in water.
Solution : Given,
pH = 2.03
Concentration of HF = 0.25 M
First, we have to calculate the concentration of [tex]H^{+}[/tex] ion.
pH=-log [[tex]H^{+}[/tex]]
2.03=-log [[tex]H^{+}[/tex]]
[tex]H^{+}[/tex]= 9.3 x [tex]10^{-3} M[/tex]
Now we have to calculate the value of [tex]K_{a}[/tex] for HF.
The equilibrium reaction will be:
[tex]HF\leftrightharpoons \ H^{+}+F^{-}[/tex]
Concentration of [tex]H^{+}[/tex] = Concentration of [tex]F^{-}[/tex]= 9.3 x [tex]10^{-3} M[/tex]
The expression of [tex]K_{a}[/tex] for HF will be,
[tex]k_{a} =\frac{[F]^{-} [H]^{+} }{HF}[/tex]
[tex]K_{a}[/tex] = 3.5 x [tex]10^{-4} M[/tex]
Therefore, the value of [tex]K_{a}[/tex] for HF is, 3.5 x [tex]10^{-4} M[/tex]
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Which type of reaction is represented by the generic equation ab cd right arrow. ad cb? combustion decomposition single replacement double replacement
The illustration would be that of a double replacement reaction.
What are double replacement reactions?They are reactions in which 2 ionic compounds exchange ions to form two new products.
Thus, in the reaction: ab + cd ----------> ad + cb
ab and cd are two ionic compounds. The b in ab is replaced by the d in cd while the d in cd itself is replaced by the b in ab. Hence, new products, ad and cd, are formed.
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Science edpuzzle
Which of the following are some examples of a chemical change? Select all the apply
Answer:
the 3 in the middle
Explanation:
There are 5 signs of chemical changes these are odor change,color change, temperature change, production of gas and creation of precipitation.
What is nourishing for a seed of a plant?
What is the volume of 100 g of H2 gas?
Answer: Volume of H2 gas is 30.576 Litres
Explanation:
The reaction between HCl and Zn is as follows:
Moles of HCl = 100/36.5 = 2.73 moles
Moles of Zn = 100/65 = 1.53 moles
As per Reaction and available reagents , HCl is the limiting reagent.
So, we can say that :
2 moles HCl gives 22.4 L of H2 gas.
=> 2.73 moles of HCl gives
So, final answer is:
Volume of H2 gas is 30.576 Litres.
Which statement is true for a solution when its concentration of hydroxide ions becomes equal to the concentration of hydronium ions?
It becomes more acidic.
It becomes more alkaline.
Its pH becomes equal to 0.
Its pH becomes equal to 7.
When for a solution concentration of hydroxide ions becomes equal to the concentration of hydronium ions, its pH becomes equal to 7.
What is pH?pH of any solution is used to define the acidity, basicity or neutrality of the solution.
pH ranges from 0 to 6.9 shows acidity.pH 0 shows the neutrality.pH ranges from 7.1 to 14 shows the basicity.When the concentration of hydronium ion is equal to the concentration of the hydroxide ion then the resultant solution will be neutral, as they have a pH equals to 0.
Hence, pH of the solution becomes equal to 7.
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Temperature
to measure the movement of particies such as atoms and molecutes. As temperature increases, what is always true of the particles in a substance?
O The rate of movement increases.
O The distance between them decreases.
O The attraction between them increases
© The rate of reaction decreases.
When chlorine gas is bubbled into an aqueous solution of potassium iodide, the colourless solution turns brown.
i) Write an ionic equation for the reaction that takes place
ii) What is the name given to this type of reaction?
iii) Why does the solution turn brown?
Answer:
When chlorine (Cl 2 ) gas is passed through an aqueous solution of potassium iodide (KI), the products formed are solid iodine (I2) and potassium chloride (KCl). This is a displacement reaction in which the less reactive iodine in potassium iodide is displaced by the more reactive chlorine. The equation can be written as:
2KI(aq)+Cl2(g)→2KCl(aq)+I2 (s)
what do you think might be different between fat molecules and carbohydrate and protein molecules?
Answer:
Long answer
Proteins are the building blocks of the body, each and every organ muscle and skin and cells are made of proteins. They can also be used for providing energy to the body in a state where other energy sources aren't available.
Fats are stored energy blocks which can be used by the body at its own convenience whenever there is a deficit of energy in the body. They can also be directly burnt to give energy in cases where energy needs of the body are not met by dietary intake
Carbohydrates are the most convenient and preferable source of energy in the body and are easily converted to give out immidiate energy to the body, excess carbohydrates can be converted into fats and stored for later usage as and when required by the body.
Proteins, fats and carbohydrates have many secondary functions and roles in the human body. If you are keen to know anything more specific feel free to ask.
Short answer :Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.
Answer:
Most Nutrients are digested into easy and simpler compounds. Carbohydrates are used for energy . Fats are used for energy after they are broken into fatty acids. Protein can also be used for energy, but the first job is to help with making hormones, muscle, and other proteins.
What is the pressure of 0.33 moles of nitrogen gas, if its volume is 15.0 L at –25.0oC?
Using the ideal gas law PV =nRTPV=nRT , we find that the pressure will be P =\frac{nRT}{V}P=
V
nRT
. Then, we'll substitute and find the pressure, using T = -25 °C = 248.15 K and R = 0.0821 \frac{atm\cdot L}{mol \cdot K}
mol⋅K
atm⋅L
:
P =\frac{nRT}{V} = \frac{(0.33\,\cancel{mol})(0.0821\frac{atm\cdot \cancel{L}}{\cancel{mol \cdot K}})(248.15\,\cancel{K})}{15.0\,\cancel{L}} = 0.4482\,atmP=
V
nRT
=
15.0
L
(0.33
mol
)(0.0821
mol⋅K
atm⋅
L
)(248.15
K
)
=0.4482atm
In conclusion, the pressure of this gas is P=0.4482 atm.
Reference:
Chang, R. (2010). Chemistry. McGraw-Hill, New York.
How many grams of carbon dioxide are produced when 16 g of methane and 48 g of oxygen gas combust
Chandra wants to know how many moles are contained in 150.0 g ccl4 (carbon tetrachloride). what quantity of ccl4 should she use to make this conversion? number of moles the number of atoms molar mass mole ratio
The quantity of carbon tetrachloride, CCl₄ she will use to make her conversion is molar mass
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
How to determine the mole of CCl₄Mass of CCl₄ = 30 gMolar mass of CCl₄ = 12 + (35.5×4) = 154 g/mol Mole of CCl₄ =?Mole = mass / molar mass
Mole of CCl₄ = 150 / 154
Mole of CCl₄ = 0.974 mole
Thus, we can see that the molar mass of CCl₄ is needed to obtain the number of mole.
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HELP!
5. From which location in the image would
a concert viewer experience the sound
waves with the greatest intensity?
A. location A
B. location B
C. location C
What is the intermediate, catalyst, and rate determining step? And what do we call this set of reactions?
How much heat energy is required to raise the temperature of 50g of bromine from 25°C to 30°C? [Specific heat capacity of bromine = 0.226 J/(g°C]
Answer: 56.5 J
Explanation:
Which one of the following substances would be the most soluble in ccl4?
One of the following substances would be the most soluble in CCl₄ is C₄H₁₀.
What is CCl₄?CCl₄ is carbon tetra chloride is an organic compound with a sweet smell and colorless liquid.
It is used in liquid for refrigerator, as a pesticide, a propellant for aresol cans and in fire extinguisher, but it is very a harmful substance that why it is banned.
Thus, the substances would be the most soluble in CCl₄ is C₄H₁₀.
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Select the pair in which former is stronger nucleophile than latter in polar aprotic solvent
The pair in which former is stronger nucleophile than later in polar aprotic solvent is CH₃NH₂ and (CH₃)₂NH. The correct option is A.
What is nucleophile and polar aprotic solvent?Nucleophiles are molecules that have a pair of electrons that can be shared. They are also called electron rich species.
Polar aprotic solvents are incapable of forming hydrogen bonds with the substrate. They don't have any hydrogen atoms directly connected to an electronegative atom, so they can't form a hydrogen bond.
Acetone, chloroform, dichloromethane, and other aprotic solvents are examples.
Thus, the correct option is A. CH₃NH₂ and (CH₃)₂NH.
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If you took a cross-section of soil from your backyard, what would be the correct order of soil layers from top to bottom?
A. organic, topsoil, subsoil, parent rock, bedrock
B. bedrock, parent rock, subsoil, topsoil, organic
C. bedrock, subsoil, parent rock, organic, topsoil
D. topsoil, organic, subsoil, bedrock, parent rock
The correct order of the vertical cross-section of soil layers is organic, topsoil, subsoil, parent rock, and bedrock.
What is the soil profile?The soil profile is the vertical cross-section of soil from the top to the underlining bedrock layer.
Starting from the top, soil contains organic materials in the form of decomposing leaves, twigs, etc. Immediately after the organic materials lies the topsoil.
After the topsoil comes the subsoil, parent rock, and bedrocks respectively.
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Answer:
A organic, topsoil, subsoil, parent rock, bedrock
Explanation:
Many people in the world don't have access to clean drinking water. What may be the cause of this?
Answer:
Climate change and an increase in unpredictable and extreme weather is a growing challenge. Long periods of drought affect clean water supplies while flooding can pollute clean water sources and cause outbreaks of disease.
Answer:
could be areas they live in
In which state of the following compounds does nitrogen have the most positive oxidation state? group of answer choices no2 nano2 hno3 n2o nh4cl
The compound nitrogen have most positive oxidation state is NO₂. The correct option is b.
What is oxidation state?The total number of electrons gained or lost by an atom in order to form a chemical bond with another atom.
The charge on an ion is equal to the sum of the oxidation states of all the atoms in the ion. A substance's more electronegative elements are given a negative oxidation state.
A positive oxidation state is assigned to the less electronegative element.
Thus, the correct option is b, NO₂.
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When small pieces of manganese oxide were added to a solution of hydrogen peroxide, water and oxygen were produced. Manganese oxide was not used up in the reaction. Which of the following is likely to increase the rate of the reaction?
A) Reducing the number of pieces of manganese oxide used
B) Increasing the amount of solution
C) Using one cube of equal mass of manganese oxide
D) Chilling the hydrogen peroxide solution
The change which increase the rate of the reaction is by increasing the amount of solution.
What is the rate of the reaction?Rate of the reaction gives idea about the speed of the completion of the reaction or the formation of the products.
Given chemical reaction is:
2H₂O₂ [tex]\overset{MnO_{2}}{\rightarrow}[/tex] 2H₂O + O₂
In the above chemical reaction MnO₂ acts as a catalyst which helps in increasing the rate of the reaction without being involved in the reaction. So the formation of the product depends only on the concentration of the solution. So, by increasing the solution amount will increase in the rate.
Hence, increasing the amount of solution will increase the rate.
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Answer:
B. increasing the amount of solution
Explanation:
took the test:)