When an atom that has no charge loses two electrons, it becomes a:
A: positive ion.
B: negative ion.
C: positive isotope.
D: negative isotope.
Answer: Option (a) is correct.
Explanation:
It is known that electrons hold a negative charge. So, when the negative charge that is electrons are taken out an atom then the number of electrons become less in number as compared to the number of protons.
Hence, the atom attains a positive charge.
An isotope is formed when an atom shows same number of protons and different number of neutrons. So, when an atom loses 2 electrons there will be no change in the number of neutrons. Therefore, an isotope will not form.
Thus, it is concluded that when an atom with no charge loses two electrons, it becomes a positive ion.
Answer:
positive ion
Explanation:
The gas in a cylinder has a volume of 8 liters at a pressure of 101 kPa. The pressure of the gas is increased to 213 kPa. Assuming the temperature remains constant, what would the new volume be?
Please show your work, thanks!
don't answer if you're not 100%.
A compound differs from a mixture in that the compound
has two or more identities
has only one identity
is composed of only one kind of atom
can be separated by physical means.
A burning match is an example of a chemical change phase change nuclear change physical change
A burning match is an example of a chemical change. The transformation of two or more reactants into new compounds.
The term "chemical change" describes a process when one or more compounds are changed into new substances with new chemical properties. The atoms of the original substances rearrange themselves to establish new chemical bonds during a chemical transition, producing new molecules or compounds.
An illustration of a chemical change, in which two or more reactants are changed into new compounds, would be a burning match. Sulphur, wood, and oxygen combine to create smoke and ash when a match is lit.
To know more about chemical change, here:
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If 7.84 × 107 J of energy is released from a fusion reaction, what amount of mass in kilograms would be lost? Recall that c = 3 × 108 m/s.
7.06 × 1024
8.71 × 10-4
8.71 × 10-7
8.71 × 10–10
Answer:
The amount of mass in kilograms would be lost [tex]8.7111\times 10^{-10} kg[/tex].
Explanation:
Energy released during fusion reaction = [tex]7.84\times 10^7 J[/tex]
Mass of amount lost during the reaction = Δm
Speed of the light = c = [tex]3\times 10^8 m/s[/tex]
Using Einstein equation :
[tex]E=\Delta m\times c^2[/tex]
[tex]7.84\times 10^7 J=\Delta m\times (3\times 10^8 m/s)^2[/tex]
[tex]\Delta m=8.7111\times 10^{-10} kg[/tex]
The amount of mass in kilograms would be lost [tex]8.7111\times 10^{-10} kg[/tex].
which of the following is not something that the atmosphere does for us ?
a. the atmosphere gives us air to breath
b. the atmosphere provides us protection
c. the atmosphere gives us gravity
d. the atmosphere provides us with weather
What I said the molarity of an hcl solution if 24.0 ml is completely neutralized by 98.0 ml of 0.250m ca(oh)2
Covalent compounds:
a)are formed from one metal and one nonmetal
b) exchange electrons in a chemical bond
c) have a low melting point
d)have weaker bonds than ionic compounds
Which answer would be correct i think maybe B
The correct option is c i.e, have a low melting point. Covalent compounds have a low melting point due to weaker intermolecular forces. They are formed from two or more nonmetal elements and share electrons in a chemical bond.
Understanding the properties of covalent compounds is essential in Chemistry. Let's analyze each option provided:
Option A: Covalent compounds are not formed from one metal and one nonmetal. Instead, they are formed from two or more nonmetal elements.Option B: This option is incorrect because, in covalent bonds, atoms share electrons rather than exchange them.Option C: Covalent compounds indeed have a low melting point compared to ionic compounds. This is due to the weaker intermolecular forces present in covalent compounds.Option D: Correct. Covalent bonds generally have weaker bonds than ionic compounds, making it easier to melt or boil covalent compounds.Given the above explanations, the correct answer is Option C: Covalent compounds have a low melting point.
What is the molar mass of (NH4)2SO4
A student does not observe a change when holding a test tube in a flame. However, a change is expected. What is the most likely reason for this?
D. The reactants were not heated long enough.
a race car driver drives 35 laps in 84 minutes what is the average laps per minute