Answer: Option (3) is the correct answer.
Explanation:
A reaction due to which there occurs change in chemical composition of reactants is known as a chemical reaction.
For example, evolution of heat when two substances combine together shows a chemical reaction has taken place between the substances.
Whereas a reaction which does not bring any changes in chemical composition of the reactants is known as a physical reaction.
For example, boiling point, melting point, mass, volume etc are all physical properties.
Thus, we can conclude that out of the given options a substance melts when sitting in the Sun, is not an indication of a chemical reaction.
Answer:
A substance melts when sitting in the Sun.Explanation:
Identify the reaction type shown and describe the clues that were used to identify it. Fe2O3 + 2SiO2 → Fe2Si2O7
The answer is synthesis reaction
The explanation:
when synthesis reaction or direct combination reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds. The product is always a compound
and we here
Fe2O3 + 2SiO2 → Fe2Si2O7
Fe2O3 is combined with SiO2 and form a more complex product Fe2Si2O7
so this is a synthesis reaction.
This chemical equation represents a synthesis reaction. This identification is based on the fact that the reactant chemical compounds combine to form a single chemical substance that is different from the initial chemical substance.
^sample response, will get you 100%^
Which definition is correct?
A. A physical change creates a new substance because bonds are broken or formed
B. A chemical change occurs when the substance remains the same but the shape, or other physical characteristics change
C. A physical change can happen without changing any characteristics of the substance
D. A chemical change produces a new substance by breaking and forming new bonds
Describe the difference between nuclear energy and light energy
Answer:Nuclear energy is the stored potential energy in the nucleus of an atom. ... Compared to this, light energy is a form of electromagnetic radiation such that it is composed of photons, which are small packets of light energy. Each photon has a characteristic wavelength, frequency.
Explanation:
Granite can form when magma cools within earth. Basalt can form when lava cools on earth surface. What do granite and basalt have in common?
Answer: (A) They are igneous.
Explanation:
what causes element name to change
The name of an element changes when its atomic number changes. This can occur naturally through radioactive decay or artificially through a process known as transmutation, where changes are made in the number of protons in an atom's nucleus.
Explanation:The name of an element changes when its atomic number changes. This happens either through natural radioactive decay processes or through artificial transmutation involving changes in the number of protons in an atom's nucleus. For example, Uranium-238, over time, naturally decays to Lead-206, signifying a change in the atomic number, hence a change in element name.
Similarly, in Accelerators or nuclear reactors, high-energy particles can be used to convert some elements into others. For instance, the bombardment of nitrogen atoms by alpha particles in a nuclear reaction can transform it into Carbon.
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What is the difference between a cast fossil and a mold fossil?
A mold fossil is created when an object is deposited in soft mud and is later removed by physical means or decomposition. In contrast, a cast fossil is created when a mold fossil fills with sediment.
What are fossil?Fossil are defined as the well-preserved remnants of plants and animals whose carcasses were buried beneath ancient seas, lakes, and rivers in sediments like sand and muck.
Mold fossil is defined as a fossil is created when silt covers the inside or outside of a dead organism and the organism's remains are buried, leaving only the rock's structure and texture to serve as a reminder of what was once within.
Thus, a mold fossil is created when an object is deposited in soft mud and is later removed by physical means or decomposition. In contrast, a cast fossil is created when a mold fossil fills with sediment.
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Why are pickles stored in glass jars not metal jars ?
What determines whether a metamorphic rock is foliated or non-foliated?
the presence or absence of mineral crystals
the water content as a percentage of the rock volume
the number of remaining gas molecules
temperature, pressure, and the original type of rock
the answer is D temperature, pressure,and the original type of rock
The presence or absence of mineral crystals determines whether a metamorphic rock is foliated or non-foliated.
What is mineral?
A mineral is an inorganic solid that forms in nature and has an organised atomic structure and a known chemical composition.
Even while it may seem like a mouthful, if you break it down, it becomes clearer. Minerals are created naturally.
Foliated metamorphic rocks have layers or stripes that result from the alignment and lengthening of the rock's minerals during metamorphism.
Non foliated metamorphic rocks, on the other hand, don't have the minerals that align during metamorphism and don't have layers.
Thus, The presence or absence of mineral crystals determines whether a metamorphic rock is foliated or non-foliated.
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In the reaction __H2 + O2 → 2H2O, what coefficient should be placed in front of H2 to balance the reaction?
1
2
3
no coefficient is needed
Answer:
the awnser is 2
Explanation:
Describe two types of mechanical weathering
Final answer:
Mechanical weathering involves the breakdown of rocks into smaller pieces without altering their chemical composition. Abrasion and frost wedging are two types, with abrasion caused by rocks and sediments grinding against each other, and frost wedging resulting from the expansion of freezing water inside rock fissures.
Explanation:
Two Types of Mechanical Weathering
Mechanical weathering is the physical breakdown of rocks into smaller fragments without changing the chemical composition of the minerals within the rock. Abrasion and frost wedging are two common types of mechanical weathering.
Abrasion
Abrasion occurs when rocks and sediment grind against each other, powered by natural forces such as gravity, moving water, wind, and glaciers. This friction and collision strip away the outer layers of rocks, making them smoother and rounder over time. For example, pebbles in a stream are often smooth because of the continuous abrasion they undergo.
Frost Wedging
Another type of mechanical weathering, frost wedging, happens when water seeps into cracks in rocks and freezes. As water freezes, it expands, exerting pressure on the surrounding rock, causing it to crack and eventually break apart. This process is particularly effective in climates with frequent temperature fluctuations above and below freezing, contributing to the breakup of boulders and the formation of talus slopes.
what is the kinetic energy of a 150kg object that is moving with a speed of 15m/s ??
which nonmetals in the atmosphere and their combinations are essential for life on earth
Nitrogen, oxygen, carbon, and hydrogen are nonmetals essential for life on Earth. Nitrogen is necessary for protein synthesis, while oxygen is used in respiration and is part of essential molecules like water. Photosynthesis has played a key role in shaping Earth's atmosphere, which is unique in its balance of oxygen and carbon dioxide.
Explanation:The nonmetals in the atmosphere essential for life on Earth include nitrogen, oxygen, carbon, and hydrogen. These elements are found in various combinations that are vital for different processes. Nitrogen makes up 78% of the Earth's atmosphere and is crucial for the formation of proteins in living organisms, though it's not directly usable in its gaseous form N₂. Nitrogen is a component of the Earth's atmosphere and contributes to diluting oxygen, which prevents rapid combustion. The atmosphere contains oxygen, used by all living things for aerobic respiration and essential in energy production within cells.
Oxygen is also essential for processes like combustion and is involved in the creation of molecules necessary for life, such as water (H₂O) and carbon dioxide (CO₂). Carbon and hydrogen, although less abundant in the atmosphere compared to nitrogen and oxygen, are part of vital organic molecules like glucose (C₆H₁₂O₆), which is crucial for energy production in life forms. These elements are tied to life-sustaining processes, such as photosynthesis, which maintains the balance of oxygen and carbon dioxide in the atmosphere.
Life on Earth has notably altered the composition of the atmosphere compared to other planets like Venus and Mars, which have atmospheres with very high concentrations of CO₂ due to the absence of water and mechanisms like photosynthesis that recycle carbon dioxide into oxygen. Earth's unique atmosphere, rich in oxygen and with moderate levels of carbon dioxide, is the result of these life processes.
What could cause a theory to be modified?
which would conduct electricity well in solution: a strong electrolyte, a weak electrolyte, both types of electrolytes, or neither type of electrolyte?
Strong electrolytes conduct electricity well, weak electrolytes conduct to a lesser extent, and non-electrolytes do not conduct at all.
Strong electrolytes conduct electricity well in solution as they contain a high number of ions, leading to high conductivity. On the other hand, weak electrolytes conduct electricity to a lesser extent due to fewer ions present. Non-electrolytes do not conduct electricity in solution at all.
Min tapes a piece of string to each of two ping-pong balls. He hangs the balls so that they are close to one another but do not touch. Later, he finds that they have pulled together. They are now touching. What could explain why two balls are now touching?
A) they have both lost their charges
B) they have gained opposite charges
C) they have both gained a positive charge
D) they have both gained a negative charge
in times of hot dry weather some cities ban the use of garden sprinklers why do you think there is such a rule
Answer:
To restrict the amount of water being utilized from a limited supply.
Explanation:
A sprinkler or a hosepipe ban gets imposed in certain cities during hot weather conditions in order to conserve the declining levels of drinking water, that is, stored in the reservoirs at the time of drought. Once the rainy season comes back the ban gets lifted as the reservoirs get filled once again, and it is more essential to provide water to the public, as the grass can always grow again.
glucose is an important sugar in many biochemical reactions. What is the molarity of a solution that contains 500 grams of glucose (molecular weight= 180.16 g/mol) in 0.72 liters of solution?
Which isotope has a relatively short half-life?
carbon-12
carbon-14
uranium-238
oxygen-16
Answer is Carbon-14
Radioactive isotopes have half lives. Half life is the time taken by the radioactive isotope to reduce its initial amount by half.
Oxygen-16 and Carbon-12 are stable isotopes of elements O and C respectively. Hence, they do not have half-lives. But Carbon-14 and Uranium-238 are radioactive isotopes. Among them Carbon-14 has relatively short half-life as about 5730 years while Uranium-238 has a long half-life as about 4.5 billion years.
cuando se quema fosforos es cambio quimico ofisico
1.) What is this group of words?
The cats ran.
A.) a good sentence
B.) comma splice
C.) run-on
D.) fragment
2.) What is this group of words?
The giant turtle named Bob.
A.) a good sentence
B.) comma splice
C.) run-on
D.) fragment
3.) What is this group of words?
Rolling around in the dirt.
A.) a good sentence
B.) comma splice
C.) run-on
D.) fragment
Answer:
1. Answer: A, a good sentence
2. Answer: D, fragment
3. Answer: D, fragment
Explanation:
the first sentence is a complete thought, it has a subject and a verb. Both 2 and 3 are fragments, or the beginnings of sentences.
In the given examples, 'The cats ran.' is a good sentence, 'The giant turtle named Bob.' is a fragment because it lacks a verb, and 'Rolling around in the dirt.' is a fragment as it does not have a clear subject or verb. Option A, D, D is correct.
Let's practice identifying sentence faults and correct the given examples:
The cats ran. This is a good sentence because it has a subject ('The cats') and a verb ('ran') and expresses a complete thought.The giant turtle named Bob. This is a fragment because it lacks a verb showing what the subject is doing or what is happening to the subject. To correct this, we could add a verb, for example: 'The giant turtle named Bob is swimming.'Rolling around in the dirt. This is also a fragment because it is just a phrase without a clear subject performing the action. We can correct this by adding a subject and verb, for example: 'The dog is rolling around in the dirt.'Hence, A. D. D. is the correct option.PLZ HELP When subjected to heat and pressure, a chemical sedimentary rock can be changed into which rock type?
a non-foliated igneous rock
metamorphic rock
a clastic sedimentary rock
a foliated igneous rock
B. Metamorphic rock
:)
according to the current model of the atom, the atoms are most stable when they have filled outer energy levels. How do the properties of noble gases support this model??
Noble gases, including helium, neon, and argon, exhibit evidence supporting the atomic model's claim of stability when outer energy shells are filled. Their unreactive nature and stable configurations are due to having a full valence shell, providing concrete evidence within this atomic model.
Explanation:According to the current model of the atom, atoms are most stable when their outer energy levels, or valence shells, are filled. This aligns perfectly with the properties exhibited by noble gases. Noble gases, which include helium, neon, and argon, to name a few, all have a full outer valence shell. This configuration makes them extremely stable, as the full valence shell of each noble gas atom results in a large ionization energy, denoting their resistance to giving up an electron. In addition, the introduction of an extra electron would place it in a higher energy level that is loosely bound, which is undesirable.
The properties of noble gases provide evidence for the atomic model's claim of stability. Their lack of reactivity is tied directly to their filled outer energy shells, demonstrating that atoms with a completed outer shell are most stable. This evidence supports the principle of the atomic model that by filling each energy level from the shell closest to the nucleus to the outermost shell, atoms achieve their most stable state. This model also explains why other elements engage in bond formation with other atoms to achieve full electron capacity and stability.
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true
or false most meteoroids burn up the ionosphere
The claim that most meteoroids burn up in the ionosphere is false.
The statement that most meteoroids burn up in the ionosphere is false. In reality, meteoroids enter the Earth's atmosphere and burn up in the mesosphere, not the ionosphere. The ionosphere is known for its high ion density, which affects radio wave propagation, but it is not where meteoroids typically disintegrate. The mesosphere, positioned above the ionosphere, is where meteoroids experience significant friction with atmospheric gases leading to their high temperatures and eventual vaporization. Most of the large meteoroids become meteors and burn up completely before reaching Earth's surface. Occasionally, some may survive the journey through the atmosphere and hit the surface, becoming meteorites.
It is commonly misunderstood that meteorites, upon landing, are hot and cause fires. However, meteorites are cold in space, and despite their fiery descent, remain largely cold inside, sometimes even developing a frost coating. This dispels the myth that a freshly fallen meteorite could start a fire. Thus, the spectacle of a bright fireball in the sky rarely ends with a meteorite hitting the ground.
Jose and Gina are studying balanced and unbalanced forces and are challenged to test their theories. Predict the result when Jose applies 6 Newtons of forces to one side of a box and Gina applies 6 Newtons of force to the other side of the box.
A)
The box does not move.
B)
The box moves toward Gina.
C)
The box moves toward Jose.
D)
The force crumples the box.
Answer : The correct option is, (A) The box does not move.
Explanation :
Force : It is defined as the force can be a push or a pull.
Balanced force : When the two forces are equal in magnitude and in opposite direction. These forces are balance to each other. In this force, the object does not move.
Unbalanced force : When the two forces are not equal in magnitude and direction. These forces does not balance to each other. In this force, the object will move on that side where the force will be applied more.
There are three cases :
Case 1 : [tex]F_L=F_R[/tex]
That means, when the force applied from left side are equal to the force applied from the right side then they balance to each other and object will not move.
Case 2 : [tex]F_L>F_R[/tex]
That means, when the force applied from left side are more than the force applied from the right side then the object will move towards right side.
Case 3 : [tex]F_L<F_R[/tex]
That means, when the force applied from left side are less than the force applied from the right side then the object will move towards left side.
According to question, the applied forces are equal in magnitude and in opposite direction. So, the box will not move.
Therefore, the correct answer is, A
which is not found in dry air
A paper clip can stay on the surface of a sample of water because of water's strong surface tension. What is the cause of this surface tension? (HINT: review question 6)
Question 6: Why are water molecules attracted to each other? It is neutral. Because of the way oxygen and hydrogen are bonded together, water has an area of positive charge and an area of negatative charge. This makes water a polar molecule. Because of water's polarity, water molecules are attracted to each other.
What acceleration does the force of earths gravity produce?
(a) 9.8 m/s/s
(b) It varies depending on how long it has been falling.
(c) Gravity does not produce an acceleration.
(d) It changes direction every 9.8 meters.
Answer: A
Explanation: Acceleration due to gravity, denoted by (g), is the acceleration gained by an object because of gravitational force action on the object. It has a standard value 9.8m/s/s.
How do you balance the equation Hydrogen plus Oxygen yield water?
Identify at least one property of water that differs from the properties of the elements that form it.
Answer:
h20
Explanation:
The properties of water, like its polarity, capacity to form hydrogen bonds, and its high heat capacity significantly differ from the properties of its constituent elements - hydrogen and oxygen. These properties allow water to possess characteristics crucial to life such as acting as a solvent and having thermal stability. The differences demonstrate how atoms can gain new properties when they combine to form compounds.
Explanation:Water, a compound composed of hydrogen and oxygen (H₂O), displays properties that differ significantly from those of its constituent elements. One major property of water is its polarity, which allows for the formation of hydrogen bonds between adjacent water molecules, contributing to unique characteristics vital for life.
For instance, water's hydrogen bonds give it a high heat capacity and heat of vaporization, resulting in temperature stability which is important for maintaining homeostasis in living organisms. The polarity of water and its hydrogen bond formation allows it to act as an excellent solvent for other polar molecules and ions. Moreover, the hydrogen bonding makes solid water or ice less dense than liquid water, a phenomenon not commonly observed in other substances. This is due to the molecules forming a crystalline structure when frozen, that is maintained by hydrogen bonding.
These properties of the water molecule such as hydrogen bonding, high heat capacity, polarity and being an excellent solvent are drastically different from the properties of individual hydrogen and oxygen atoms. Therefore, it illustrates how composition and bonding change the properties of elements when they form compounds.
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Which is the least dense?
copper
mercury
water
wood
D. WOOD IS THE LEAST DENSE .
HOW CAN WE IDENTIFY ??
The object that floats on the water surface easily that is least dense. Density of objects in g/cm³Copper = 8.96
Mercury = 5.43
Water = 1
Wood = 0-1
Hence wood is the least dense object .
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