During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is likely occurring?
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Answer:
A solid forms, and there is a change of color.
Explanation:
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The second atom emits light with more energy.
The first and second atoms absorb energy without emitting light.
The first and second atoms emit light with the same amount of energy.
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The correct option is this: THE FIRST ATOM EMITS LIGHT WITH MORE ENERGY.
In the question given above, the level 1 mentioned in the question refers to the ground state of the electrons while level 2 and level 3 refer to excited states of hydrogen electrons. When an atom is in an excited state, it possess more energy and it is unstable, thus, it tends to return to the ground state after sometime to attain stability. As the atom return to the ground state, it loses its energy by emitting light. The higher the level of excitation, the more the light that will be emitted when the atom is returning to the ground state. Thus, an atom returning to the ground state from level 3 has more energy and will emit more light when returning to the ground state than an electron in level 2.
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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.
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B. Catalyst B
C. Catalyst C
D. Catalyst D
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Answer:
B. Catalyst B
Explanation:
Explanation: Enzymes are complex proteins that have a very specific shape. Just as a key fits a lock and allows it to open, the active site of the enzyme fits the reactants, allowing them to meet at the right orientation to form new chemical bonds. The shape of catalyst B is the best fit to the given reactants and product. The presence of catalysts allows reactions to proceed at much lower energy levels than without, as high-energy collisions between molecules are no longer necessary.
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Matter is made up of very small particles called Atom.
What is an Atom ?
An atom is the smallest unit of ordinary matter that forms a chemical element.
Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.
An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.
An atom is a particle of matter that uniquely defines a chemical element.
Therefore, Matter is made up of very small particles called Atom.
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An atom are the basic building blocks of ordinary matter. Atoms can join to form molecules, which in turn from most of the objects around you.
Atoms are composed of particles called protons, electrons, and neutrons.
Protons carry a positive electrical charge.
Electrons carry a negative electrical charge.
Neutrons carry no electrical charge at all.
Hope i helped! And i know you didn't ask for all that, but i put by the way. If you need anything else ask me.
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The distance (in meters south) the plate will be given that the plate is moving at a rate of 2 cm/year is 80 meters south (last option)
How do i determine the distance?
Speed is defined as distance travelled per unit time. This is mathematically written as
Speed = Distance travelled / time
If we make distance the subject, we have
Distance travelled = Speed × time
The following data were obtained from the question:
- Speed of plate = 2 cm/year = 2 / 100 = 0.02 m/year
- Time = 4000 years
- Distance travelled =?
Distance travelled = Speed × time
Distance travelled = 0.02 × 4000
Distance travelled = 80 meters south
Thus, we can conclude that the distance travelled is 80 meters south (last option)
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the plate will be 80 meters south from its original location in 4,000 years. The correct answer is (d) 80 meters south.
The plate moves south at a rate of 2 cm/year. To find out how many meters south it will be in 4,000 years, we need to convert the years to centimeters and then meters.
In 4,000 years, the plate will have moved: 2 cm/year x 4,000 years = 8,000 cm.
Now, to convert 8,000 cm to meters, we need to divide by 100 (since there are 100 centimeters in a meter):
8,000 cm / 100 = 80 meters.
So, the plate will be 80 meters south from its original location in 4,000 years. The correct answer is (d) 80 meters south.
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Complete question is:
A plate moves south at a rate of 2 cm/year. How many meters south from its original location will the plate be in 4,000 years?
a. 8,000 meters south
b. 4,000 meters south
c. 200 meters south
d. 80 meters south