The chemical reactions are generally of many types. The exothermic and endothermic reactions are important among them. In an exothermic reaction the chemical energy is converted to thermal energy. The correct option is 1.
What is exothermic reaction?The chemical reactions which proceed with the evolution of heat energy are defined as the exothermic reactions. The chemical reactions which proceed with the absorption of heat energy are called endothermic reactions.
In an exothermic reaction, system loses heat to surroundings. Since heat is given out in exothermic reactions, the enthalpy of the products will be less than that of the reactants.
In exothermic reaction, q will be negative and the enthalpy change will be also negative. In this reaction chemical bonds are broken and new bonds are formed. The chemical energy is converted to kinetic energy which is released as heat.
Thus exothermic reaction releases thermal energy.
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PLs HELP ME LIKE ASAP
How do the light rays emitted by a candle travel?
Answer:
Explanation:
The light rays coming from the unlit candle and the reflected light rays of the lit candle are superposed on top of one another. ... For very transparent substances like glass, only about 5 percent of the light that hits it is reflected. The remaining 95 percent is transmitted—it passes right on through.
Answer:
The light rays coming from the unlit candle and the reflected light rays of the lit candle are superposed on top of one another. ... For very transparent substances like glass, only about 5 percent of the light that hits it is reflected. The remaining 95 percent is transmitted—it passes right on through.
Explanation:
A kite is an example of what?
(A) A system
(B)A process
(C)A pattern
(D)A change
Answer: I think it is the process
Explanation:
How does this evidence help explain why the skin cancer rate is higher in Australia than in Brazil, even though the two countries get the same amount of sunlight?
Answer:
The Ozone layer
Explanation:
Ozone in the atmosphere can absorb ultraviolet light, which stops the light from reaching Earth’s surface, so people absorb less of it. Australia has less ozone than other places, like Brazil, and this is why Australia gets more ultraviolet light.
What patterns in the rock layer fossils helped you identify an extinction?
Answer:
Hope this helps!! :D
Explanation:
Often, the rock layers bookending the mass extinction are noticeably different in their compositions. These changes in the rocks show the effects of environmental disturbances that triggered the mass extinction and sometimes hint at the catastrophic cause of the extinction.
The wastewater in your home goes to one of three places. It can run into a home septic system, it can go to a centralized sewage treatment plant, or it might be directly discharged into a body of water. Where does your water go after it goes down the drain?
Answer:
Sewage Treatment
Explanation:
I am sorry if I got this wrong but if I did please correct me!
Which set of coefficients would balance the following equation?
Mg + AlCl3 → Al + MgCl2
A. 2Mg + AlCl3 → Al + 2MgCl2
B. 3Mg + 2AlCl3 → 2Al + 3MgCl2
C. Mg + 2AlCl3 → 2Al + MgCl2
D. 3Mg + 4AlCl3 → 4Al + 3MgCl2
The chemical equation which is balanced according to law of conservation of mass is 3 Mg + 2 AlCl₃ → 2 Al + 3 MgCl₂.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Answer ian rlly kno ...........
Study the image of Earth’s layers. Cross section of layers of the Earth. Inner core equals 1,216 kilometers; Outer core equals 2,270 kilometers. Mantle equals 2,885 kilometers, and consists of lower and upper mantle. Upper mantle is made up by: Asthenosphere at 660 kilometers, Lithosphere at 100 kilometers, Oceanic crust at 5 kilometers, Continental crust at 30 to 40 kilometers. Which statement correctly compares the thicknesses of Earth’s layers? Earth’s mantle is thinner than its oceanic crust. Earth’s outer core is thicker than its mantle. Earth’s continental crust is thicker than its lithosphere. Earth’s lithosphere is thinner than its asthenosphereStudy the image of Earth’s layers.
Answer:
the person on top is right.
Explanation:
What patterns in the rock layer fossils helped you identify an extinction?
HELP plz
Are beaches made from erosion or deposition?
Answer:
Desposition
Explanation:
Answer:
Deposition
Explanation:
Beaches are wave-deposited accumulations of sediment.
HURRY PLEASE
Sarah says that galaxies are larger than solar systems. What evidence supports this claim?
Group of answer choices
Galaxies are made of stars.
Our solar system is at the heart of the Milky Way Galaxy.
Solar systems are older than galaxies.
Solar systems and galaxies are about the same size.
Help its for science ill give brainilest.
Answer:
This equation reveals that the kinetic energy of an object is directly proportional to the square of its speed. That means that for a twofold increase in speed, the kinetic energy will increase by a factor of four.
Explanation:
I KEEP ASKING FOR HELP IVE DONE MOST OF THE QUESTIONS MYSELF BUT NEED HELP IN SOME IF YOU ANSWER I WILL GIVE BRAINLIEST
What happens to the motion of an object if forces acting on the object are equal and balanced?
A. The object begins to move
B. The object begins to slow down
C. The motion of the object does not change
Answer:
When the forces acting on an object have equal strength and act in opposite directions, they are balanced. These forces cancel out one another, and the motion of the object they are acting on remains unchanged. The object may change its speed (speed up or slow down), or it may change its direction.
So I think its C
You see this is because if the forces were different the object would either speed up or slow down but in this case the forces are equal so the motion of the object does not change.
Hope This Helps :)
CH4 + __O2 → CO2 + ___H2O
balance this equation
Explanation:
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Answer:
CH4+2O2→CO2+2H2O
Explanation:
Start with the least common atoms and leave things like H and O to the end.
You need to have the same number of methane reactants as carbon dioxide products because there is one carbon in each. I’ll set them both to 1 for now. O see two things with oxygen on the product side so we will have to juggle numbers a bit to figure out those. There is only H in the water so we’ll go there next. One CH4 gives 2 water molecules so we have that done now. At last we can tackle the O atoms. In two waters there are 2 and in the CO2 there are two more so a total of 4 O atoms in the products so we need two O2 molecules in the reactant side.
Hope this is useful.
Use the drop-down menus to select the names of the labeled structures.
A: B: C:
Answer:
A: petal
B:stigma
c: stamen
Explanation:
A flower is considered as a complete one if it has petals, stamen, carpel and sepals. Sometimes pistil is present. Here in the structure part A is Petal, B is Stigma and C is stamen.
What are parts of a flower?The calyx, corolla, androecium, and gynoecium are found to be the four whorls of a modified leaves which constitute the flower. One of the flower parts in each of the whorl contains sepals, petals, stamens and pistils.
Here A is petal. This part is the bright coloured region which attracts bees and birds. This part help us to differentiate one flower from another. Some petals are dark coloured whereas some other are pale coloured.
Here B is stigma. The stigma is the sticky part of a flower. It is the specially adapted portion of the pistil modified for the reception of pollen. It has a feathery, branched elongated structure.
Here C is stamen - The male reproductive part of a flower is called the stamen. The stamen has long slender stalk called the filament with a two -lobed anther at the tip.
Thus the given parts are petal, stigma and stamen.
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What are examples of pollution that can be caused by agriculture?
Answer:
Nitrate from agriculture is now the most common chemical contaminant in the world’s groundwater aquifers. Aquatic ecosystems are affected by agricultural pollution; for example, eutrophication caused by the accumulation of nutrients in lakes and coastal waters impacts biodiversity and fisheries.
Answer: Agricultural Pollution is a waste or discharge resulting from farming that degrades or contaminates the surrounding environment. This pollutions comes from several sources and has adverse effects on many different types of organisms. The impact of this pollution can be reduced through certain practices. Causes are:
Explanation:
Pesticides and Fertilizers. To begin with, the earliest source of pollution has been pesticides and fertilizers. ...
Contaminated Water. ...
Soil Erosion and Sedimentation. ...
Livestock. ...
Pests and Weeds. ...
Heavy Metals. ...
Soil Erosion and Sedimentation. ...
Organic Contaminants.
“The use of fossil fuels by human’s is heating up the atmosphere” is an example of a law or theory? Explain your answer in at least 3 sentences.
Answer: Theory
It is a theory which is true because it is not a law. A theory by definition is “ a plausible or scientifically acceptable general principle or body of principles offered to explain phenomena.” A law is “a rule defining correct procedure or behaviour in a sport.“ Therefore since this a scientific fact and it is used/ not against the law it is a theory
Explanation:
Which of the following would not be restricted (limited) by low levels of ATP?
Please help will give brainliest
Which of the following statements is TRUE regarding air resistance?
A fast-moving object experiences more air resistance than a slow-moving object
A slow-moving object experiences more air resistance than a fast-moving object
Which graph above shows an object’s acceleration? Why did you choose that graph(explain why)
Velocity vs. Time shows an objects acceleration because... in Position vs. Time the line does not go through the origin and it’s very uneven, But Velocitu vs. time goes through the origin and has straight lines.
Answer:
B.
Explanation:
Because the lines are vertical no so wormy like.
pls help really easy just search the questions f u need to
Answer:i cant seee
Explanation:
none
PLS HELP THIS IS URGENT LIKE AN ASPA QUESTION THAT NEEDS AND ANSWER PLS HELP
Describe the percentages of electromagnetic energy that comes from the sun?
Match the following items with the correct descriptions.
1. releases hydrogen ions
base
2. accepts hydrogen ions
eight
3. poor conductor of electricity
metal
4. shiny and lustrous
nonmetal
5. maximum number of electrons in first shell
acid
6. maximum number of electrons in second shell
two
Answer:
1.releases hydrogen ion acid
2.accepts hydrogen ion base
3. poor conductor of electricity non metal
4. shiny and lustrous metal
5. maximum number of electrons in first shell
two
6. maximum number of electrons in second shell
eight
How does melanin provide protection against skin cancer? use absorb
energy
light in your sentece
The melanin provides protection against skin cancer by absorbing harmful UV light from the electromagnetic spectrum.
What is electromagnetic spectrum?
The electromagnetic spectrum consists of radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.
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need help on queston 4 and 5
How is salinity affected?
(a) evaporation increases
(c) freezing increases
(d) melting increases
(e) precipitation increases
Where does the energy that causes evaporation come from?
What role does gravity play in the water cycle?
Describe the flow of one molecule of water through the water cycle, beginning in the ocean.
Answer:
A and E.
Explanation:
When water evaporates, it leaves the salt. When rain falls, the salt is diluted. The sun causes the evaporation. The also the sunlight is the energy source, the greatest force propelling the water cycle is gravity. Gravity is the force of attraction between two objects, and Earth’s gravity pulls matter downward, toward its center. It pulls precipitation down from clouds and pulls water downhill. Gravity also moves air and ocean water. Also Water travels in a continuous path through Earth called the water cycle. The journey starts in the Earth's oceans. As the Sun heats the ocean, the water evaporates into a gas. The gas meets cooler air, and the gas changes into droplets of tiny water molecules. This process is called condensation. Little droplets of water fall back down to Earth again as precipitation. The precipitation fills up the rivers and various other things and the cycle begins all over again. Now with this being said, there is much more than just this!
Good luck!
What type of erosion cause a canyon form?
water
wind
ice
Answer:Water
Explanation: none
i will give u 50 points if u help me
Answer:
a b a
Explanation:
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A characteristic property is one that remains the same regardless of the amount of matter that is present.
Which of the following is a characteristic property of matter?
Group of answer choices
Density
Mass
Volume
Weight
The moon's observed motion across the sky is PRIMARILY due to the
A)
rotation of the moon.
B)
rotation of the earth.
C)
orbit of the moon around the earth.
D)
orbit of the earth around the moon.
Answer:
I think that rotation of the moon is the correct one
Explanation:
C) orbit of the moon around the Earth