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The chemical reaction indicate the formation of new substance by change in nature of original compound and shows chemical changes in the reaction.
What is chemical reaction?
Chemical reaction is defined as process in which two or more molecules collide with the proper orientation and enough force to produce a new product.
It is also defined as a procedure in which one or more compounds, known as reactants, are changed into one or more distinct substances, known as products.
There are mainly seven types of reaction.
- Synthesis reaction
- Decomposition reaction
- Displacement reaction
- Double displacement reaction
- Combustion reaction
- Redox reaction
- Acid-Base reaction
Thus, the chemical reaction indicate the formation of new substance by change in nature of original compound and shows chemical changes in the reaction.
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Answer:
Changes in Properties Changes in properties result when new substances form. For instance, gas production, formation of a precipitate, and a color change are all possible evidence that a chemical reaction has taken place. ... Change in Color A color change can signal that a new substance has formed.
Explanation:
Related Questions
What is the molarity of the following solutions?a. 19.5 g NaHCO3 in 460.0 ml solution b. 26.0 g H2SO4 in 200.0 mL solutionc. 15.0 g NaCl dissolved to make 420.0 mL solution
For this reaction, C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O, the ∆H is –2200 kJ. If two moles of C3H8(g) reacted with excess oxygen, what would be true?
Identify the type of bonding within each substance. Co ( s ) ionic covalent metallic CoCl 2 ( s ) covalent ionic metallic CCl 4 ( l ) metallic covalent ionic
Describe the relationship between predator and prey in a balanced ecosystem. Please help I'll give brainliest.
Answers
The study of chemicals and bonds is called chemistry. There are two types of elements are there and these rare metals and nonmetals.
The correct answer is 5.59.
What is PH?
- pH, historically denoting "potential of hydrogen" is a scale used to specify the acidity or basicity of an aqueous solution.
- Acidic solutions are measured to have lower pH values than basic or alkaline solutions
The pH of the solution will be due to excessive acid left and the salt formed. Thus, it will form a buffer solution.
The pH of buffer solution is calculated from Henderson Hassalbalch's equation, which is:
The moles of acid are taken as:-
The moles of the base are taken as:-
moles of acid left is 0.5
Place all the values to the equation:-
Hence, the correct answer is 5.69.
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Answer:
pH of soltion will be 5.69
Explanation:
The pH of the solution will be due to excessive acid left and the salt formed. Thus, it will form a buffer solution.
The pH of buffer solution is calculated from Henderson Hassalbalch's equation, which is:
The moles of acid taken :
The moles of base taken:
The moles of acid left after reaction :
The moles of salt formed = 4.5mmol
Putting values in equation
i. two
ii. three
iii. six
iv. eight
(b) How many atoms are directly bonded to the central atom in a trigonal bipyramidal molecule?
i. three
ii. four
iii. five
iv. six
(c) How many atoms are directly bonded to the central atom in an octahedral molecule?
i. three
ii. four
iii. six
iv. eight
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Answer:
a) ii
b)iii
c)iii
Explanation:
three atoms directly bonded then only it is possible to achieve trigonal planar
trigonal bipyramidal means five atoms should attach to central atom
for octahedral six atoms must directly connected to central atom
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Answer:
When the graduation line denotes the volume contained in the calibrated vessel, the ware is marked “TC”. When the graduation line indicates the volume delivered from the vessel, the ware is marked “TD”.
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According to molar concentration, for calculating molarity of salt solution mass,molar mass of salt and volume of solution is required , hence option B is correct.
What is molar concentration?
Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
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Explanation:
to find molarity
1the mass of salt added
Find the number of moles of solute dissolved in solution,
2 molar mass of salt
Find the volume of solution in liters,
4 total volume of solution
so B
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Half-life of a radioactive element
The Half-Life of a radioactive element osbtime taken for half the nucleus of the atom of the element to decay
Calculating the original amount of U-238
- The number of moles present in each element is first determined:
- Number of moles = mass/molar mass
For Pb-206:
mass = 0.37 mg = 0.37 * 10⁻³ g
molar mass = 206 g/mol
number of moles = 0.37 * 10⁻³ g/206 g/mol
number of moles of Pb-206 = 1.79 * 10⁻⁶ moles
For U-238:
mass = 0.95 mg = 0.95 * 10⁻³ g
molar mass = 238 g/mol
number of moles = 0.95 * 10⁻³ g/238 g/mol
number of moles = 3.99 * 10⁻⁶ moles
Assuming that all the Pb-206 were formed from U-238
- Initial moles of U-238 = Moles of present U-238 + molesw of present Pb-208
Initial moles of U-238 = 3.99 * 10⁻⁶ moles + 1.79 * 10⁻⁶ moles
Initial moles of U-238 = 5.78 * 10⁻⁶ moles
One mole of U-238 contains = 6.02 * 10²³ atoms
5.78 * 10⁻⁶ moles of U-238 will contain 6.02 * 10²³ * 5.78 * 10⁻⁶ atoms
Number of atoms of U-238 initially present = 3.48 * 10¹⁸ atoms
Therefore, the number of atoms of U-238 initially present is 3.48 * 10¹⁸ atoms
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The expression for the equilibrium constant Kp for the following reaction is
Equilibrium constant:
It refers to the ratio of the concentration of products to the concentration of reactants where each raised to the power of their stoichiometric ratios. It is expressed as K.
Since the given expression is
MoO3(s) ↔ 2 MoO2(s) + O2(g)
So, the above expression should be considered for constant kp
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Answer:
Explanation:
Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as
is the constant of a certain reaction at equilibrium for gaseous reactants and products.
For the given chemical reaction:
The expression of for above equation follows:
As solids do not exert pressure, and
are not involved.