Answer: True
Explanation:
A chemical reaction in which the oxidation number of an atom, ion or molecule changes due transfer of electrons between two reactants is known as oxidation-reduction reaction or redox reaction. In Redox reaction, the oxidising agent brings oxidation by gaining electrons and reducing it self.
Example:
Zn + Cu²⁺ → Zn²⁺ + Cu
Here, Cu²⁺ is an oxidizing agent which got reduced to Cu .
Thus, the given statement is true.
It's true that in an oxidation-reduction reaction, the oxidizing agent always undergoes reduction. The oxidizing agent is a substance that is capable of oxidizing other substances, meaning it causes them to lose electrons. By taking these electrons, the oxidizing agent itself is reduced.
In an oxidation-reduction reaction, also known as a redox reaction, the statement that the oxidizing agent always undergoes reduction is indeed true. The oxidizing agent is a substance that has the ability to oxidize other substances, meaning it causes them to lose electrons. In taking these electrons, the oxidizing agent itself is reduced. This is due to the principle that in a redox reaction, when one substance is oxidized (loses electrons), another substance must be reduced (gain electrons).
#SPJ6
Answer:
magnitude of force is 1725 N
direction is opposite to the direction of car moving i.e west
Explanation:
Given data
car mass = 1380 kg
speed = 27.0 m/s
time = 8 s
speed = 17 m/s
to find out
magnitude and direction of the net force
solution
we find here first acceleration thats formula is
a = v(initial) - v(final) / time
a =27 - 17 / 8
acceleration = 1.25 m/s
so force is = ma
force is = 1380 ( 1.25)
force = 1725 N
so magnitude of force is 1725 N
and this is here direction is opposite to the direction of car moving i.e west
The net force that leads to the deceleration of the 1380 kg car from 27.0 m/s to 17.0 m/s over 8.00 seconds has a magnitude of 1725 N and is directed towards the west.
To solve for the magnitude and direction of the net force that produces the deceleration in the car, you first need to calculate the acceleration and then use it to find the net force using the formula f = m * a. The acceleration here represents a deceleration because the speed is decreasing.
Acceleration can be found using the formula a = (v_f - v_i) / t. Here, v_i is the initial speed (27.0 m/s), v_f is the final speed (17.0 m/s), and t is the time interval (8.00 s). This gives you a = (17.0 m/s - 27.0 m/s) / 8.00 s = -1.25 m/s^2. The negative sign represents deceleration.
Now, apply this deceleration to the formula for force, f = m * a. Here, m is the mass of the car (1380 kg) and a is the value we computed (-1.25 m/s^2). So, f = 1380 kg * -1.25 m/s^2 = -1725 N. The negative sign indicates that the force is in the direction opposite to the initial motion of the car. Therefore, the magnitude of the net force is 1725 N, and the direction is towards the west or opposite to the car's original path.
#SPJ3
Answer: An atom valence electron shell determines its chemical reactivity.
Explanation:
An atom's valence electron shell determines its chemical reactivity. The amount of electrons in the outermost shell of an atom is its valence electron and it determines how reactive the atom is.
The reactivity of an atom depends on the number of electrons in its outermost shell. Atoms that has their outermost electrons full e.g noble gases like argon, krypton etc are unreactive because there is no room for the atom to donate or accept any electron.
Elements like sodium and chlorine are reactive because they possesses 1 and 7 electrons in their outermost shell respectively as such they can donate and accept electrons making them reactive elements.
The valence electron shell of an atom determines its chemical reactivity. This is due to the role these outermost electrons play in the formation of chemical bonds. Atoms aim to achieve a stable state, typically with eight electrons in their outermost shell, through accepting, donating, or sharing electrons.
The correct answer to the multiple choice question about the atom's valence electron shell is '2. determines its chemical reactivity'. The outermost shell of an atom is known as the valence shell. This shell, holding the valence electrons, is essential in determining an atom's chemical reactivity. This is because it's the valence electrons that are engaged in the formation of chemical bonds.
Chemical reactivity refers to the ease with which an atom gains, loses, or shares electrons. Stable atoms, like helium or larger atoms with eight electrons, are less likely to participate in chemical reactions. They already have a filled valence shell. However, other atoms, those with less than eight electrons, will strive to complete their outer shell by interacting with other atoms, either accepting, donating or sharing electrons to achieve stability.
Importantly, not all elements have enough electrons to completely fill their outermost shells and so they form chemical bonds by sharing, accepting, or donating electrons to other atoms. The formation of these bonds is largely determined by what is often referred to as the 'octet rule', which states that atoms seek to fill or have eight electrons in their outermost electron shell to achieve greater stability.
For more such questions on valence electron, click on:
#SPJ3
Mass-energy equivalence, as articulated in Einstein's E=mc² equation, indicates that mass can be converted to energy and vice versa. This theory has current practical applications such as the operations in nuclear power plants and in explaining natural phenomena like solar energy generation.
The principle describing mass-energy equivalence is most accurately presented by Albert Einstein's mass-energy equivalence equation, E = mc². In some processes, according to this equation from the theory of special relativity, mass can be converted into energy, and vice versa. This means that we consider mass to be a form of energy, not something distinct.
Examples of this conversion are seen in everyday life and nature. For instance, the sun's energy, the energy from nuclear decay, and even the heat in Earth's interior can be traced back to the mass-energy equivalence. Nuclear power plants and nuclear weapons provide practical examples of mass being converted into energy. In these cases, a tiny fraction of mass is annihilated to produce energy expressed as nuclear radiation.
Therefore, the theory of conservation of mass was supplanted by the more comprehensive theory of conservation of mass-energy which includes the phenomenon of mass-energy equivalence, and is described mathematically in the equation E= mc².
Learn more about Mass-Energy Equivalence here:
#SPJ6
Answer:
C. All energy in the universe is a result of mass being converted into energy.
Explanation:
Edge 2021