The density of gold is 19.32. Give two reasons why this statement is incomplete
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The density of gold is 19.32. The two reasons due to which the statement is incomplete are there is no unit and it doesn't present the temperature and pressure.
What is density?
Density has been defined as the mass per unit volume it means that mass is present in one meter cube.
S.I unit of density is kg/meter^3.
Mathematically
Density = Mass/Volume.
Momentum has been the product of mass and velocity. It is a vector quantity and it's S.I unit kg x meter/sec. There will be no effect of the outside environment on the potential energy that has to be present inside the body. The kinetic energy decrease or increase with change in the velocity.
Weight has been defined as the total heaviness of the body or object. It has been also known as the portion of anything weighs. In physics weight has been known as the vertical force which has experienced by mass which is due to the gravitation. The weight has been equal to the mass of the body and the product of mass and acceleration of free fall is known as weight.
Therefore, The density of gold is 19.32. The two reasons due to which the statement is incomplete are there is no unit and it doesn't present the temperature and pressure.
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Object 1 is have more density than Object 2.
What is density ?
A material's density is a measure of how much stuff of a material has in a unit volume.
It is essentially a measured to see how tightly matter is crammed together or how a matter is compact.
For instance wood floats in water as it has lower density, while an anchor sinks as it has a higher density.
Helium balloons float in air as air has higher density than helium.
A specific gravity which is a related term to density otherwise called as relative density of a material.
It is the ratio of the density of a material to the density of water.
If the specific gravity of an object is less than one will float in water, where as specific gravity greater than one means it will sink. Hence object 1 has more density.
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Answers
Answer:
Explanation:
H⁺ = 1.2 x 10⁻²
pH = - log[H⁺]
= - log [ 1.2 x 10⁻²]
= - log1.2 + 2
= - .079 + 2
= 1.921 .
Answers
Answer:
Hygroscopic substances
Explanation:
Hygroscopic compounds are those that absorb moisture and a large amount of water and they become wet. They should not be confused with deliquescent substances that absorb water and forms solution.
Hygroscopic substances froms pasty substances and not solution while the liquid ones only becomes diluted. Examples are sodium trioxonitrate(v) (NaNO₃), copper (ii) oxide CuO, and concentrated tetraoxosulphate (vi) acid (H₂SO₄)
Final answer:
Hydrophilic substances, like cellulose found in cotton and paper pulp, can soak up large amounts of water. Some chemical compounds, such as sodiumcarbonate decahydrate and copper(II) sulfate pentahydrate, have this property. Moreover, phosphorus(V) oxide, although used for removing water from compounds, also shows a great affinity for water.
Explanation:
A compound that has the ability to soak up large amounts of water is termed a hydrophilic substance. Hydrophilic substances are attracted to water, absorbing it readily. For example, cotton and paper pulp, used in towels, are made of molecules of cellulose that contain many –OH groups.
Water molecules are attracted to these -OH groups and form hydrogen bonds with them, drawing large amounts of H₂O up the cellulose fibers. Additionally, some compounds like sodium carbonate decahydrate and copper(II) sulfate pentahydrate also have the ability to soak up water. Another example is phosphorus(V) oxide, which has a great affinity for water and is used for removing water from compounds.
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(2) the activation energy of the exothermic reaction
(3) the difference between the potential energy of the products and the potential energy of the reactants
(4) the sum of the potential energy of the products and the potential energy of the reactants
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Answer: The correct answer is Option 3.
Explanation:
The net energy absorbed or released in a reaction is known as total enthalpy change of the reaction. It is designated as
It is defined as the difference between the total potential energy of the products and the total potential energy of the reactants. The equation for this is given by:
where,
= Total potential energy of the products
= Total potential energy of the reactants
Hence, the correct answer is Option 3.
b) Fe₂(SO₄)₃
c) Fe₂(SO₃)₃
d) Fe₂SO₄
e) Fe₂SO₃
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interchanged oxidation number[Fe]3+[SO3]2-
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1) Reactivity and Electronegativity decreases
2)Melting and Boiling point increases
3)There is an increase in colour intensity due to the progressive shift to longer wavelengths in the spectrum of light
4) The intramolecular attraction increase and as such there is a progressive shift from gas to solid
5)Increase in oxidising power
6) Atomic and ionic radii increases
7) Electrode potential decreases