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Lisa [10]
3 years ago
9

When a covalent or an ionic bond is formed a chemical change has occurred. Which of these is not associated with a chemical chan

ge?
A) The atoms of the substance produced have been rearranged.
B) The substances produced are identical to the substances that reacted except that they're isomers.
C) The total mass of the reacting substances is the same as the total mass of the substance produced by the reaction.
D) The chemical properties of the substances produced by the reaction are different from those of the reacting substances.
Physics
2 answers:
Readme [11.4K]3 years ago
6 0
The answer is B). The total mass and the atom numbers of reacts and products are the same in the reaction. But that does not mean the production are identical to the reactants.
mixas84 [53]3 years ago
4 0

Answer: B) The substances produced are identical to the substances that reacted except that they're isomers.

Explanation: Chemical change is a change in which atoms of the reactants are rearranged ,thus leading to formation of new products.

The new substances formed are different compounds from the original reactants and thus they have different properties.

2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)

This is an example of chemical reaction in which the bond between chlorine molecule is broken and a new bond between sodium and chlorine gets formed.

NaCl formed is an ionic compound whereas chlorine is a covalent compound and sodium is a metal.

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Akimi4 [234]

Velocity has direction but speed does not have direction

7 0
4 years ago
A tree loses water to the air by the process of transpiration at the rate of 110 g/h. This water is replaced by the upward flow
Vinvika [58]

Answer:

The answer is 1.87nm/s.

Explanation:

The 110g/hr  water loss must be replaced by 110g/hr of sap. 110g of sap corresponds to a volume of  

110g \div \dfrac{1040*10^3g}{1*10^6cm^3}  = 106cm^3

thus rate of sap replacement is

106cm^3/hr = 106*10^{-6}m^3/3600s  = 2.94*10^{-8}m^3/s

The volume of sap in the vessel of length x is

V = Ax,

where A is the cross sectional area of the vessel.

For 2000 such vessels, the volume is

V = 2000Ax

taking the derivative of both sides we get:

\dfrac{dV}{dt} = 2000A \dfrac{dx}{dt}

on the left-hand-side \dfrac{dx}{dt} is the velocity v of the sap, and on right-hand-side \dfrac{dV}{dt}  = 2.94*10^{-8}m^3/s; therefore,

2.94*10^{-8}m^3/s=2000Av

and since the cross-sectional area is

A = \pi (\dfrac{100*10^{-3}m}{2} )^2 = 7.85*10^{-3}m^2;

therefore,

2.94*10^{-8}m^3/s =2000(7.85*10^{-3}m^2)v

solving for v we get:

v = \dfrac{2.94*10^{-8}m^3/s}{2000(7.85*10^{-3}m^2)}

\boxed{v =1.875*10^{-9}m/s = 1.875nm/s}

which is the upward speed of the sap in each vessel.

4 0
4 years ago
A steam engine generating 5 hp is raising a load weighing 2000 lb.How high will thebload be raised in 10 s.​
notsponge [240]

Answer:

Explanation:

bi

6 0
4 years ago
Refrigerators are usually kept at about 5∘C, while room temperature is about 20∘C. If you were to take an "empty" sealed 2-liter
expeople1 [14]

Answer:

The volume will not contract to one fourth of the original.

Explanation:

Applying Charles's Law as:

\frac {V_1}{T_1}=\frac {V_2}{T_2}

Given ,  

V₁ = ?

V₂ = 2 L

T₁ = 5 °C

T₂ = 20 °C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

So,

T₁ = (5 + 273.15) K = 278.15 K  

T₂ = (20 + 273.15) K = 293.15 K  

Using Charles law as:

V_1=\frac {V_2}{T_2} \times {T_1}

V_1=\frac {2\ L}{293.15 K} \times {278.15 K}

V_1=1.8977 L

Thus, the volume will not contract to one fourth of the original. (1/4 of 2 L is 0.5 L).

8 0
4 years ago
Which physical phenomenon causes the spherical shapes of raindrops
jeyben [28]

Answer:

Raindrops start to form in a roughly spherical structure due to the surface tension of water. This surface tension is the "skin" of a body of water that makes the molecules stick together. The cause is the weak hydrogen bonds that occur between water molecules.

6 0
3 years ago
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