The dark smooth areas on the surface of the moon is called Maria.
Maria is made up of solidified lava which is a result of volcanic activity on the moon.
When Galileo observed these smooth dark spots on the moon he called them 'mare' which is latin for 'sea'. And the plural form of mare is 'maria'. Unlike Galileo predictions, recent investigations confirm that maria are not oceans but solidified lava.
What example involves a phase change in which heat energy is released by the substance
Spontaneous phase changes that leads to an increase in the stability of a substance would release energy. For example, converting a gas to its liquid state such as cooling water vapor below its boiling point releases energy. Cooling allows water molecules to establish intermolecular hydrogen bonds to produce a liquid while releasing energy. The formation of bonds between water molecules is so exothermic that a steam scald can be significantly more serious to treat than a hot water scald.
Answer:
Freezing ice cream :)
Explanation:
i got it right on edge 2021
Which sample of matter is a mixture? Air, water, ammonia
I think air is a mixture. Water and ammonia are compounds.
Air is a mixture. Water and ammonia are compounds.
What is a mixture?A mixture is composed of one or more pure substances in varying compositions.
There are two types of mixtures: heterogeneous and homogeneous.
Air is a mixture of various gases like nitrogen, oxygen, methane, nitrous oxide, etc. These gases retain their properties in air and hence the air is considered a mixture.
Ammonia is a simple compound composed of one atom of nitrogen and three atoms of hydrogen.
Water is also a simple compound composed of one atom of oxygen and two atoms of hydrogen.
Hence, Air is a mixture. Water and ammonia are compounds.
Learn more about mixture here:
https://brainly.com/question/12160179
#SPJ2
Justin Bleeber is a lazy young man and decides to burn a pile of leaves instead of bagging it. The pile of leaves weighed three pounds before being burned. After the leaves are burned the leftover ash weighs half a pound. What happened to the rest of the mass of the leaves? A) It was destroyed. B) It soaked into the ground. C) It compacted into the ash. D) It was turned into smoke and gas.
Answer is: D) It was turned into smoke and gas.
Conservation of mass (mass is never lost or gained in chemical reactions), during chemical reaction no particles are created or destroyed, the atoms are rearranged from the reactants to the products.
Gas that escaped is probably carbon(IV) oxide and little carbon(II) oxide, so the mass of product measured is less than reactants.
If mass of gas is also measured, masses of reactants and products are the same.
Which statement explains how this type of fossil differs from a trace fossil?
This fossil reveals the activities of an organism.
This fossil was created in solidifying sediment.
This fossil is an impression left by an organism.
This fossil was an organism that has been turned into rock.
In an ecosystem, this type of fossil differs from a trace fossil as this fossil was an organism that has been turned into rock.
What is an ecosystem?
Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
https://brainly.com/question/1061425
#SPJ3
Answer: D
Explanation:
Which statement best describes the trend in atomic radii observed in the periodic table?
1. The atomic radii increase, moving across a period to the right and up in a group.
2. The atomic radii increase, moving across a period to the left and down in a group.
3. The atomic radii increase, moving across a period to the left and up in a group.
4. The atomic radii increase, moving across a period to the right and down in a group.
Answer: The correct answer is Option 2.
Explanation:
Atomic radius of an atom is defined as the total distance from the nucleus to the outermost shell of the atom.
As moving from top to bottom, there is an addition of shell around the nucleus and the outermost shell gets far away from the nucleus and hence, the distance between the nucleus and outermost shell increases. Thus, increasing the atomic radii of the atom.
As moving from left to right in a period, more and more electrons get added up in the same shell and the attraction between the last electron and nucleus increases, which results in the shrinkage of size of an atom. Thus, decreasing the atomic radii of the atom on moving towards right of the periodic table.
Hence, the correct answer is Option 2.
Atomic radii decrease from left to right across a period due to increased nuclear charge and increase down a group as additional electron shells are added. This makes atomic size trend to the lower left corner of the periodic table. As a result, choice 2 is accurate..
The periodic table shows a distinct trend in atomic radii. The atomic radii shrink from left to right during a time. This is because as more protons are added to the nucleus, the increased positive charge pulls the valence electrons closer, reducing atomic size.
Conversely, as you move down a group in the periodic table, the atomic radii increase. This occurs because new electron shells are added, placing the valence electrons farther from the nucleus, hence increasing the atomic size.
Therefore, the best description of the trend in atomic radii is:
The atomic radii rise, traveling in a group to the left and down over a period of time..What evidence supports Bohr’s claim that an electron is found only in specific energy levels around the nucleus of the atom. And then connect this evidence to the claim through reasoning
Energy Levels of Electrons. As you may remember from chemistry, an atom consists of electrons orbiting around a nucleus. ... They are restricted to orbits with only certain energies. Electrons can jump from one energy level to another, but they can never have orbits with energies other than the allowed energy levels.
The evidence that support Bohr's claim is that electron can only emit light when its energy level changes.
Bohr proposed an atomic model in which;
the electrons found in an atom can only occupy orbits for which the angular momentum is quantized, which results in discrete values of energy level. the electrons in such stationary state or ground state emits no light, if an electron jumps to a lower state, it emits a photon whose energy equals the difference in energy between the two states.
Thus, we can conclude that the evidence that support Bohr's claim is that electron can only emit light when its energy level changes.
Learn more here:https://brainly.com/question/1625635
a balanced ball on a basketball hoop is potential energy or kinectic energy?
potential energy
Explanation:An object has potential energy if it is above the ground. For example, if the basketball is sitting still on a table, it has potential energy but no kinetic energy. Potential energy is the stored energy of position possessed by an object. Potential energy is associated with forces that act on a body in a way that the total work done by these forces on the body depends only on the initial and final positions of the body in space. So the balanced ball on basket ball hoop has stored energy in it i.e. potential energy.
Which of these is a balanced chemical equation?
Answer: option H
Explanation:
Balanced equation means that the no of atoms on both sides should be equal.
In H, Cl2 + 2NaBr-------> Br2 + 2NaCl
No of Cl atoms, 2=2
No of Br atoms, 2=2
And sodium atoms,2=2
Hence it is balanced equation
And remain are not balanced.
Which of the following laws can be described as, “within every force interaction, each object exerts the same amount of force on the other object, but in the opposite direction.”
Newton’s second law
Newton’s fourth law
Newton’s third law
Newton’s first law
The correct answer is Newton’s third law.
According to Newton’s third law of motion to every action there is an equal and opposite reaction.
Action and reaction forces form the crux of Newton's third law of motion.
Push and pull are two examples of action and reaction forces. Also the action and reaction forces act on two different objects.
Answer:
"Newton's third law of motion"
Explanation:
Sir Issac Newton has given three laws of motion namely,
Newton’s first law Newton’s second law Newton’s third lawNewton's first law of motion gives the introduction of force. Newton's second law of motion gives the magnitude of force and Newton's third law of motion can be described as "within every force interaction, each object exerts the same amount of force on the other object, but in the opposite direction".
So, the correct option is (c) "Newton's third law of motion".
How does the activity series help determine the anode of a voltaic cell?
The anode is the metal that is higher on the list because it is more easily reduced.
The anode is the metal that is lower on the list because it is more easily reduced.
The anode is the metal that is higher on the list because it is more easily oxidized.
The anode is the metal that is lower on the list because it is more easily oxidized.
The anode is the metal that is higher on the list because it is more easily oxidized.
Answer: The anode is the metal that is higher on the list because it is more easily oxidized.
Explanation: The Anode of the voltaic cell is the electrode on which the process of oxidation takes place.
Oxidation is the process in which highly reactive metal which is higher in the electrochemical series loses electrons which goes into the solution.
Thus The anode is the metal that is higher on the list because it is more easily oxidized.
For eg- In a reaction cell of Copper-Iron, Iron(Fe) will get oxidized because it is placed higher in the electrochemical series whereas Copper(Cu) will get reduced.