Answer:
True
Explanation:
Reason being there are 3 systems even in the open system the heat and matter goes in and out , the closed system the heat goes in and out as well and in the isolated system it stays in
1. Which of the following combinations correctly represents the process of
photosynthesis?
a) Carbon Dioxide + Water + solar energy - Glucose + Oxygen
b) Carbon Dioxide + Water - Glucose + Oxygen + solar energy
c) Glucose + Oxygen Carbon Dioxide + Water + energy
d) Glucose + Oxygen + energy +
Carbon Dioxide + Water
Answer:
A
Explanation:
Answer:
I think It should be option A. It would have been B but, solar energy is not giving out, it's taken in
Help me with this this is something i dont know and its not on here please help meeeeeee
Answer:
it would be option A
Explanation:
This is becuase if you look at the chart you can see tyhat the group of rats that got feed to vitamans did gain more wati then the ones on the normal diet.
If voume is held constant (the width remained the same in the simulation), what happens to P as T increases?
оа
It remains the same
Oь
It decreases
oc
It depends- it can either increase or decrease randomly
d
It increases
Answer:
If there is a decrease in the volume there is less space for molecules to move and therefore they collide more often, increasing the pressure. If there is an increase in the volume the molecules have more space to move, collisions happen less often and the pressure is decreased.
Explanation:
If there is a decrease in the volume there is less space for molecules to move and therefore they collide more often, increasing the pressure. If there is an increase in the volume the molecules have more space to move, collisions happen less often and the pressure is decreased.
What makes radioisotopes useful for dating objects?
O A. They have unique emission spectra.
O B. They decay at a predictable rate.
C. Their decay products are easy to detect.
O D. They all have extremely long half-lives.
Answer:A
Explanation:
Option D. They all have extremely long half-lives makes radioisotopes useful for dating objects.
What are radioisotopes?Radioisotopes exist as radioactive isotopes of an element. They can also be described as atoms that include an unstable combination of neutrons and protons, or surplus energy in their nucleus.
A radionuclide exists as a nuclide that contains excess nuclear energy, causing it unstable. This excess energy can be utilized in one of three methods: emitted from the nucleus as gamma radiation; assigned to one of its electrons to terminate it as a conversion electron; or utilized to create and emit a unique particle from the nucleus.
Radioactive isotopes of radium, thorium, and uranium, for example, exist found naturally in rocks and soil. Uranium and thorium also happen in trace amounts in water. Radon, induced by the radioactive decay of radium, stands present in the air.
Hence, Option D. They all have extremely long half-lives makes radioisotopes useful for dating objects.
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Barbara is conducting an experiment to observe heat flow. She places one piece of metal in a freezer at -18 degrees Celsius (°C) and a second piece of metal in an oven at 200 °C. After 2 hours, she takes the metal pieces out of the freezer and oven and places them both in the same beaker of boiling water for two minutes. Which of the following best describes how some of the heat will initially move in this system?
Heat will flow from the frozen metal into the hot metal.
Heat will flow from the boiling water into the hot metal.
Heat will flow from the boiling water into the frozen metal.
Heat will flow from the frozen metal into the boiling water.
Answer: The correct answer is heat will flow from the boiling water into the frozen metal.
Explanation:
According to the law of conservation of energy, energy cannot be destroyed nor created but it can be transformed from 1 form to another form.
There are 3 processes of heat transfer:
Conduction: This type of heat transfer occurs when there is direct contact between the two objects.Convection: This type of heat transfer occurs when there is a movement of fluid (liquid or gas) due to the movement of hot layers to the top and cold layers to the bottom which leads to convection currents. Radiation: This type of heat transfer occurs when there is a direct transfer of energy through space.The heat moves from a hot surface to a cold surface to maintain equilibrium.
We are given:
A metal is placed in a freezer (cold object) and another metal is placed in an oven (hot object) and then both the metals are placed in boiling water.
Initially, the heat will flow from the boiling water (hot object) into the frozen metal (cold object) to maintain equilibrium
Hence, the correct answer is heat will flow from the boiling water into the frozen metal.
PLEASE HELP THIS IS TIMED
Which of the following is a physical change?
CsF(s) + XeFo(s) → CsXeF;(s)
CO2 (s) + CO2(g)
O N2 (g) + 3H2 (g) → 2NH3 (g)
2H2 (g) + O2 (g) → 2H20 (1)
Zn(s) + 2 MnO2(s) + H20(1) → Zn(OH)2(s) + Mn2O3(s)
Evolution can best be described as
A)
the change in size of body structures through use and disuse
B)
the formation of fossils
C)
a process of growth in an organism
D)
a process of change through time
What does it mean for something to be radioactive?
A. It has an emission spectrum.
B. It is in a stable condition.
C. It generates radio waves.
D. Its nuclei can split apart.
Answer:
D
Explanation:
Radioactivity means
the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei
hope this helps please like and mark as brainliest
What is the equilibrium expression for the reaction below?
C(s) + O2(9)
2009)
[0][c]
O A.
[CO]
O B.
1
C с
OC.
[co]
[0][c]
CO2]
D.
Answer:
C
Explanation:
because it is product over reactants. hope this helps :)
The equilibrium expression for the reaction C(s) +[tex]O_{2}[/tex](g) ⇄ [tex]CO_{2}[/tex] (g) will be
[[tex]CO_{2}[/tex] ] / [ [tex]O_{2}[/tex] ].
What is equilibrium?Chemical equilibrium is a state where no net change in the quantities of reactants as well as products takes place during a reversible chemical reaction.
The given reaction is C(s) +[tex]O_{2}[/tex](g) ⇄ [tex]CO_{2}[/tex] (g) .
It is known that solid phase is not considered in equilibrium.
Hence, equilibrium expression = [[tex]CO_{2}[/tex] ] / [ [tex]O_{2}[/tex] ].
Therefore, the correct answer will be option (D).
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This mathematical model describes the changes that occur in a sample of water as its temperature increases. Based on this model, how do you expect the motion of the molecules in ice to compare with the motion of molecules in water vapor?
A. I expect the molecules in ice to move more quickly than the molecules in water vapor.
B. This model does not provide enough data to answer the question.
C. I expect the motion to be very similar.
D. I expect the molecules n water vapor to move more quickly than the molecules in ice.
Answer:
D
Explanation:
the motion of particles can move more quickly due to weak force of attraction. water vapour is a gas hence the answer
water is to ____as liquid is to soild
water is to gas as liquid is to solid
How many grams of Cl2 will be produced along with 250.0 kJ of heat in the following reaction? Pc 5(g) + 87.9 k/
Answer:
As per the given chemical equation, 1 mole of Cl₂ is formed when 87.9 kJ of heat is absorbed. 201.64 g of Cl₂ will be produced along with 250.0 kJ of heat in the given reaction.
Explanation:
A hydrocarbon contains 92.24 % carbon by mass and has a molar
mass of 78.12 g mol-1.
Determine the empirical formula and molecular
formula of the hydrocarbon
Explanation:
so for this one you know 92.24 is the mass of C so to work out the mass of hydrogen u so 100-92.24=7.76
so
C : H
92.24/12 : 7.76 /1
7.68 : 7.76
so 7.76÷7.68=1.01
so CH
12+1=13
78.12÷13=6.009
so CH×6= C6H6
hope this helps:)
Which list BEST identifies how the arrows should be arranged around the paper leaf in the model to represent the movement of matter and flow of energy during photosynthesis? A. Point into Leaf: sugars, oxygen (02), Point away from leaf: carbon dioxide(CO2), water(H2O) B. Point into Leaf: sugars, sunlight, Point away from leaf: carbon dioxide(CO2), oxygen (02), water(H2O) C. Point into Leaf: water(H2O), sunlight, Point away from leaf: carbon dioxide(CO2), sugars, oxygen (02) D. Point into Leaf: water(H2O), carbon dioxide(CO2) sunlight, Point away from leaf: sugars, oxygen (02
Answer:
D. Point into Leaf: water(H₂O), carbon dioxide (CO₂) sunlight, Point away from leaf: Sugars, oxygen (O₂)
Explanation:
Photosynthesis is the process used in the production of chemical energy in the form of energy containing organic compounds and oxygen from atmospheric carbon dioxide and liquid water enabled with the energy captured from light (mainly Sunlight) by the chlorophyll in green plants and other organisms
The basic chemical reaction involved in a photosynthesis reaction is presented as follows;
[tex]{}[/tex] Sunlight
[tex]{}[/tex] ↓
[tex]{}[/tex] CO₂ + H₂O (l) → C₆H₁₂O₆ + O₂
Carbon dioxide [tex]{}[/tex] Water Glucose Oxygen
que tipos deagua oxigenada hay
Answer:
El agua oxigenada se encuentra en cuatro concentraciones diferentes expresadas “en tanto por ciento”: 8%, 30%, 35% y 50%. Sin embargo, hay quien prefiere hablar de “volúmenes” y no de “porcentajes”.
Use the information from the diagram to calculate the enthalpy of combustion for methane. (HELP ASAPPP!!)
A)
+752 kJ
B)
–921 kJ
C)
–604 kJ
D)
+604 kJ
Answer:
where is the diagram sisters
4. A shepherd is increasing his heard from 300 goats to 600 goats. Currently, the land is sufficient to feed 300 goats; what could be the result?
Answer: 300 goats want get food
Explanation:
What factor makes it possible for animals with endoskeletons to grow larger than animals with exoskeletons?
A. Endoskeletons can be removed and replaced.
B. Endoskeletons are lighter than exoskeletons.
C. Endoskeletons are made of fluid-filled tubes.
D. Endoskeletons lack joints that can break down.
i need help
what are alpha particles??
Answer:
a helium nucleus emitted by some radioactive substances, originally regarded as a ray.
Explanation:
Answer:
They're charged particles Identical to the Helium Nucleus
Having 2 protons and 2neutrons and having a Mass of 4.
They're Heavy and slow(speed)In comparison to Beta particles and gamma rays
Usually Emitted from nucleus of radioactive nuclides during decay
An experiment was done to discover the right amount of water to use on a plant. Seeds were planted in three identical pots. The plants were given the following amounts of water each day for forty days. Pot 1, 50mL; Pot 2, 100mL, Pot 3, 150mL. The height of each plant was measured at the end of the experiment.
What is the independent variable in this experiment?
The amount of water is the independent variable in this experiment.
What is plant?Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclude the fungi and some algae, as well as the prokaryotes (the archaea and bacteria). By one definition, plants form the clade Viridiplantae (Latin name for "green plants") which is sister of the Glaucophyta, and consists of the green algae and Embryophyta (land plants). The latter includes the flowering plants, conifers and other gymnosperms, ferns and their allies, hornworts, liverworts, and mosses.
Most plants are multicellular organisms. Green plants obtain most of their energy from sunlight via photosynthesis by primary chloroplasts that are derived from endosymbiosis with cyanobacteria. Their chloroplasts contain chlorophylls a and b, which gives them their green color. Some plants are parasitic or mycotrophic and have lost the ability to produce normal amounts of chlorophyll or to photosynthesize, but still have flowers, fruits, and seeds. Plants are characterized by sexual reproduction and alternation of generations, although asexual reproduction is also common.
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How many neutrons does this atom have?
4
6
10
14
Answer:
6
Explanation:
Electrons are floating around, and protons are outside of the nucleus center. The ones in the center are neutrons. I hope this helps.
Why does the melting of the ice caps lower the concentration of salt in the
ocean?
A. The ice caps have a high salt concentration.
B. The ice caps do not contain water.
C. The ice caps are made of freshwater
0
D. The ice caps are melting slowly.
Answer:
The answer is C
Explanation:
There is no salt in ice hope this helped :)
Answer: C
Explanation: The ice caps are made of fresh water, so when they melt they are adding more freshwater into the ocean therefore lowering the concentration of the salt.
Ayudaaa. ¿Cuál es el punto de ebullición del agua en grados Celsius?
The question is: Help. What is the boiling point of water in degrees Celsius?
Answer: The boiling point of water in degrees Celsius is [tex]100^{o}C[/tex].
Explanation:
The temperature at which vapor pressure of a liquid becomes equal to the atmospheric pressure is called boiling point.
For example, the boiling point of water is [tex]100^{o}C[/tex].
This means that at [tex]100^{o}C[/tex] the molecules of water are having an equilibrium between liquid and vapor state of theirs.
Thus, we can conclude that the boiling point of water in degrees Celsius is [tex]100^{o}C[/tex].
Which of the following statements correctly describes the characteristics of the surface features in Column A and Column B?
The surface features in column A are formed by constructive forces while the surface features in column B are formed by destructive forces.
The surface features in column A are formed by destructive forces while the surface features in column B are formed by constructive forces.
The surface features in column A are formed by long-term processes while the surface features in column B are formed by short-term processes.
The surface features in column A are formed by short-term processes while the surface features in column B are formed by long-term processes.
Answer:
The surface features in column A are formed by long term processes while the surface features in columns B are formed by short term processes
which two terms best describe the level of organization of life shown in this photo?
Answer:
there's no photo, I'm sorry
How is an endothermic reaction identified?
A. It has a large heat capacity.
B. It gives off heat as a product.
C. It requires heat as a reactant.
O D. It results in a phase change.
Answer:
Endothermic is identified if the process requires heat as a reactant, since endothermic means "intake of heat", so it has to take in some type of heat.
Which mineral can be easily scratched by a finger nail, has cleavage, a metallic luster and has a black streak? 11. Which two elements are found in all minerals on the chart?
Answer:
Galena
Explanation:
Galena is also known as lead glance. This is a natural mineral of the form lead(II) sulfide. It is one of the most important ore for lead. It is widely found and is mainly distributed in sulfide minerals.
Galena can be easily scratched by finger nails. It has black streak and have a metallic luster. Galena have cleavage. It usually occurs as cubic crystals.
Given 7 moles of nitrogen gas, how many moles of ammonia can you make?
Explanation:
just use the molar ratios to figure it out. Notice, you have to balance the chemical equation.
What important points do you need to remember about combustion?
Explanation:
A substance burning in the presence of oxygen and leads to the formation of heat and light is called combustion.
Some important points about combustion are as follows:
Fuel should be present for burning.Air should be present for the supply of oxygen.There should be heat (or ignition temperature) to initiate the chemical reaction.Which describes the forces in an unstable nucleus?
A. The electrostatic force is greater than the strong nuclear force.
B. The electrostatic force is greater than the weak nuclear force.
C. The weak nuclear force is greater than the strong nuclear force.
D. The strong nuclear force is greater than the electrostatic force.
Answer:
C. The weak nuclear force is greater than the strong nuclear force
