To study Earth’s interior, geologists often rely on indirect methods, such as evidence from fossils. true or false
Answer:
the answer is false, the person that said true is incorect.
Explanation:
Answer: FALSE
Explanation:To study Earth’s interior, geologists often rely on indirect methods, such as evidence from fossils.
Of the molecules AlC l 3 and AlB r 3 , which has bonds that are more polar?
AlCl₃ has stronger polar bonds than AlBr₃ due to chlorine's higher electronegativity. The overall polarities of these compounds would also consider their similar trigonal planar structures.
Explanation:Of the molecules AlCl₃ and AlBr₃, AlCl₃ has more polar bonds. Bond polarity arises from the difference in electronegativity between the two atoms forming a bond. Chlorine (Cl) is more electronegative than Bromine (Br), hence, electrons in AlCl₃ are pulled towards Cl more than electrons in AlBr₃ are pulled towards Br. This makes the bonds in AlCl₃ more polar than those in AlBr₃.
In the context of a molecule being polar or nonpolar, apart from just electronegativity, we also need to consider the molecule's geometric structure. However, since both AlCl₃ and AlBr₃ have a similar structure (trigonal planar), influencing factors remain the bond polarities.
The two idealized extremes of chemical bonding: (1) ionic bonding—in which one or more electrons are transferred completely from one atom to another, and the resulting ions are held together by purely electrostatic forces—and (2) covalent bonding, in which electrons are shared equally between two atoms. Most compounds, however, have polar covalent bonds, which means that electrons are shared unequally between the bonded atoms. Figure 3.4.4 compares the electron distribution in a polar covalent bond with those in an ideally covalent and an ideally ionic bond. Recall that a lowercase Greek delta ( δ
) is used to indicate that a bonded atom possesses a partial positive charge, indicated by δ+
, or a partial negative charge, indicated by δ−
, and a bond between two atoms that possess partial charges is a polar bond.
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A 0.465 g sample of an unknown compound occupies 245 ml at 298 k and 1.22 atm. what is the molar mass of the unknown compound?
a.26.3 g/mol
b.33.9 g/mol
c.12.2 g/mol
d.38.0 g/mol
e.81.8 g/mol
Answer: Option (d) is the correct answer.
Explanation:
It is know that for an ideal gas PV = nRT
where P = pressure
V = volume
n = number of moles = [tex]\frac{mass}{molar mass}[/tex]
R = gas constant = 0.082 [tex]L atm K^{-1} mol^{-1}[/tex]
T = temperature
Therefore, put the given values in the formula above as follows.
PV = nRT
or, PV = [tex]\frac{mass}{molar mass}RT[/tex]
[tex]1.22 atm \times 0.245 L = \frac{0.465 g}{molar mass} \times 0.082 L atm K^{-1} mol^{-1} \times 298 K[/tex]
molar mass = 38.12 g/mol
= 38.0 g/mol (approx)
Therefore, we can conclude that the molar mass of the unknown compound is 38.0 g/mol.
Which of the following indicates that an exothermic reaction has occurred? Temperature increases Heat is absorbed Salt is produced Water is formed
Answer: Option (a) is the correct answer.
Explanation:
A chemical reaction where heat energy is absorbed by the reactant molecules is known as an endothermic reaction.For example, [tex]A + B + Heat \rightarrow AB[/tex]
The value of [tex]\Delta H[/tex] = +ve for an endothermic reaction.
In an endothermic reaction, heat being absorbed is utilized to break the bonds. Therefore, temperature of the system decreases.
On the other hand, a chemical reaction in which heat energy is released by the reactant molecules is known as an exothermic reaction. For example, [tex]C + D \rightarrow CD + Heat[/tex] is an exothermic reaction.Generally, there occurs an increase in temperature of the substance or system because of the evolution of heat during an exothermic reaction.
Thus, we can conclude that temperature increases indicates that an exothermic reaction has occurred.
Answer:
Temp increases
Explanation: