Which event must always occur for a chemical reaction to take place?(1) formation of a precipitate(2) formation of a gas(3) effective collisions between reacting particles(4) addition of a catalyst to the reaction system
Answers
For a chemical reaction to occur, reacting particles must collide - however, not all collisions result in a reaction. They must have enough energy in the collision to react (that is, be above the activation energy). The rate of reaction is determined by the rate of successful collisions, that is to say, the more successful collisions there are in a unit time, the faster the reaction rate.
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Answer:
Halogens are better oxidizing agents than their alkali metal counterparts within the same period
Halogens have a higher first ionization energy than their alkali metal counterparts within the same period.
Halogens have a higher electron affinity than their alkali metal counterparts within the same period.
Halogens have a higher effective nuclear charge than their alkali metal counterparts within the same period
Explanation:
Effective nuclear charge increases across a period and accounts for increase in ionization energy across a period. This explains why halogens in the same period with alkali metals have higher effective bucket charge as well as ionization energy than the alkali metals.
Similarly, electron affinity increased across a period, halogens have greater ekctron affinity than corresponding alkali metals in the same period.
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Answer: The correct answer is the continuous flow of electric charges in a conductor.
Explanation:
Electric current is defined as the continuous flow of electric charges through a conductor. Direction of the electric current is opposite to the flow of electrons. It is represented by a symbol 'I' and its S.I. unit is Amperes.
Its value depends on the voltage and resistance. The equation representing the relationship between current, voltage and resistance is given by Ohm's Law, which is:
where,
V is the voltage
I is the current
R is the resistance
Hence, the correct answer is the continuous flow of electric charges in a conductor.
Electric current is: C) the continuous flow of electric charges in a conductor.
The movement or flow of electric charges across a conducting media, such as a metal wire, is known as electric current. The mobility of electrons within the conductor is what causes the flow of charges. The flow of electric charges in the majority of conventional electrical circuits is from the negative terminal, where extra electrons build up, to the positive terminal, where there are insufficient electrons.
It's crucial to understand that the passage of atoms in a conductor is not what constitutes electric current. While atoms may vibrate or move slightly within a conductor, the passage of electrons is the main movement in charge of electric current.
Static electricity does not continuously flow through a conductor, and neither does electric current. An imbalance of electric charges on a material's surface is referred to as static electricity, which normally doesn't entail a constant flow or movement of charges.
A staggered passage of charges in a conductor is not how electric current behaves either. Charges flow continuously, uniformly, and orderly through the conductor in a steady electric current.
In conclusion, electricity and electrical circuits are based on the continuous flow of electric charges, typically electrons, in a conductor. Electric current is defined as this flow.
To know more about electric charges:
#SPJ6
Answers
Answer:
i = 1
Explanation:
Van't Hoff factor (i) is explained as the number of ions dissolved in solution.
It is needed to determine colligative properties which depend on the amount of solute.
C₇H₇NO is an organic compound → benzamide
All the organic compound have 1, as Van't Hoff factor.
In order to predict i, you consider ionic salts. For example:
AlCl₃
CaCl₂
NH₄NO₃
When you dissociate them, you determine i:
AlCl₃ → Al³⁺ + 3Cl⁻ i =4
CaCl₂ → Ca²⁺ + 2Cl⁻ i = 3
NH₄NO₃ → NH₄⁺ + NO₃⁻ i =2
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2a : the composition and chemical properties of a substance
the chemistry of iron
b : chemical processes and phenomena (as of an organism)
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Answer:
potassium and sodium
Explanation:
There are many metals that can react with aluminium nitrate in a displacement reaction. these metals are higher than aluminium in the electrochemical series of elements where metals are arranged based on their reactivity and therefore tend to displace aluminium in any chemical reaction. However the most reactive of these metals are potassium(K) and sodium(Na). Others are calcium(Ca), magnesium(Mg), lithium(Li), strontium (Sr).
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Answer:
Explanation:
Overuse of antibiotics leads to bacteria's resistance against our drugs. This is increasing at an alarming rate and the reason is that overuse of antibiotics kills bacteria that lack the "resistance" gene or gene that can help them survive the antibiotics (similar is the case for insects that die to insecticides). But, some bacteria can have random mutations in their gene that can help them survive the antibiotic (similar is the case for some insects that can survive the insecticide), thus the surviving bacteria give rise to next generation of bacteria that are resistant to the given antibiotic (similar to how insects that survive the insecticide give birth to new insects that are resistant to insecticide too). Soon, every generation adds new antibiotic resistant bacteria (or new insecticide resistant insects in the case of insects) which is dangerous for all of life on this planet. Therefore, both are similar in the sense that new generations of these organisms will be resistant to our weapons against them.