Which Is A Clue That A Chemical Change Has Occured?
A. A beaker suddenly becomes very warm when you mix two room-temperature liquids in it.
B. A liquid forms bubbles when it reaches a high temperature.
C. Water changes color when you add food coloring to it.
D. A car door feels hot if you touch it on a summer afternoon.
Answer: A
Explanation:
B: That’s boiling
C: That’s physical.
D: That’s just heat being added.
It’s A because two liquids making one warmer liquid isn’t natural without a chemical making it do so.
Chemical change has occur in A beaker suddenly becomes very warm when you mix two room-temperature liquids in it.
What is chemical change?An alteration of one or more compounds into one or more new and distinct substances is referred to as a chemical change or chemical reaction. In other words, a chemical change is an atomic rearrangement-based chemical process.
A chemical change normally cannot be reversed unless through additional chemical processes, although a physical change can frequently be done so.
The energy of the system changes when a chemical shift takes place. An exothermic reaction is a chemical transformation that produces heat. An endothermic reaction is one that absorbs heat. Chemical changes known as inorganic chemical transformations typically do not involve the element carbon.
Therefore, Chemical change has occur in A beaker suddenly becomes very warm when you mix two room-temperature liquids in it.
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A scientist observes plant roots growing through the mountain side. This is evidence for which type of natural process?
Answer:The answer is erosion
Explanation:
A scientist observes plant roots growing through the mountain side. This is evidence of Weathering
Explanation:
Weathering is the breaking down of rocks, soil, minerals. Weathering happens in the same place silently not happening as a sudden slide caused by erosion. Weathering is the natural process that takes place in the mountains.
Roots of lichens are pushed between the rocks. These slowly let their roots grow through the rocks. Then they slowly produce crack in the rocks and splits it. This happens slowly and gradually that it causes withering of the rocks.
Where do most human inputs of outdoor air pollutants occur?
in the mountains
around oceans
in deserts
in urban areas
Answer:in urban areas let me know if i was right or wrong
Explanation:
Answer:
in urban areas is the correct answer.
Explanation:
most human inputs of outdoor air pollutants occur in the urban areas.
its occur in the urban areas because of the following reasons
In the urban areas, people are more depended on cars, vehicles and chemicals industries that are there which give rise to outdoor air pollutants.burning of fossil fuels in the power factory, in a machine vehicle and the industrial plants, generate large outdoor pollutants in the urban areas.A girl carried a box of books up two flights of stairs to her attic. Her father carried a box the same weight up a ladder directly to the attic. The girl says she did more work on the box than her father because she walked further up the stairs, is she correct?
Answer:
The girl is correct because her father only went the distance of the ladder, whereas she went to the extension of two flights of stairs.
Explanation:
The work done by the girl and her father is the same. The discrepancy arises from the difference in perceived effort, not actual work done. In physics, work done against gravity for the same weight over the same vertical distance is equal, regardless of the path taken.
Explanation:The question asked pertains to the concept of work in physics. According to the definition of work in physics, work is equal to the force applied to an object times the distance the object is moved in the direction of the force. The force in this scenario is the same, as the same weight box is being lifted. The distance is also the same (the vertical distance from the ground to the attic). Therefore, regardless of the path taken (flight of stairs or directly using a ladder), the work done is the same.
It might seem that more effort is required to carry the box up the stairs due to the longer path, however, this is likely due to the additional force required to fight against gravity while taking the longer route, but this doesn't constitute to additional work done in terms of physics. Work Done Against Gravity is the significant concept here. The energy changed from one form to another to overcome gravity remains the same in both cases
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When Stephanie’s light bulb did not turn on after she wired a circuit board, she asked her brother to use the same procedure to see if he got the same results.
Which important step of scientific design is being modeled?
a. reevaluating
b. repetition
c. replication
d. revising
Answer:
Revising (D)
Explanation:
Answer:
d
Explanation:
i just got it right on the test
Which best describes the difference between a theory and a hypothesis?
A) A hypothesis can be tested and a theory has already been tested.
B) A theory can be tested and a hypothesis has already been tested.
C) A hypothesis must be testable and theory does not need to be testable.
D) A theory must be testable and hypothesis does not need to be testable.
Answer:
A
Explanation:
A hypothesis is the first stage into becoming a theory. A hypothesis that has already been tested multiple times with the same outcome, becomes a theory.
Answer:
The answer is C
Explanation:
Which part of an investigation is only found in an experimental investigation? a hypothesis a control group a procedure a conclusion
Answer:
The control group
Explanation:
The control group can be described as the group, which is being used to test any hypothesis or experiment, in which there are no changes made by a researcher. It serves as a platform to compare the other groups and the changes occurring in them. All the results from an experiment are deduced by comparing the changes from the control group. Thus, every experiment investigation has a control group.
Answer:
control group
Explanation:
based on the model of cellular transport, the hydrolysis of ATP and ADP provide a mechanism for
Answer:
B
Explanation:
They move against the gradient : this is coming directly from USAtestprep
Based on the model of cellular transport, the hydrolysis of ATP and ADP provides a mechanism for moving against the gradient.
What is active transport?Active transport is a type of cellular transport that involves the use of ATP to move substances across membranes.
Active transport can move substances and ions against a concentration gradient.Conversely, passive transport moves substances in favor of a concentration gradient.In conclusion, based on the model of cellular transport, the hydrolysis of ATP and ADP provides a mechanism for moving against the gradient.
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There’s a lot . I also need help
What characteristics do all living things share
In an investigation of the cycling of environmental gases, a
student placed water and bromthymol blue in each of four test
tubes as shown in the diagrams below. No additional items were
placed in tube 1, a snail was placed in tube 2, an aquatic plant
(elodea) was placed in tube 3, and both a snail and an elodea
were placed in tube 4. The tubes were then stoppered and placed
in bright light for 24 hours.
Tube 1 Tube 2 Tube 3 Tube 4
How would the solution in tube 3 change after 24 hours?
A) It would change from yellow to blue.
B) It would change from blue to brick red.
C) It would contain more oxygen.
D) It would contain less nitrogen.
Answer:
D) It would contain less nitrogen.
Explanation:
In an investigation of the cycling of environmental gases, a student placed water and bromthymol blue in each of four test tubes as shown in the diagrams below. No additional items were placed in tube 1, a snail was placed in tube 2, an aquatic plant (elodea) was placed in tube 3, and both a snail and an elodea were placed in tube 4. The tubes were then stoppered and placed in bright light for 24 hours. The solution in tube 3 changes after 24 hours because it would contain less nitrogen.
The dfferent tubes are shown in the picture that I uploaded.
The solution in tube 3 would likely change from yellow to blue, indicating it would contain more oxygen after 24 hours in bright light, due to the process of photosynthesis performed by the elodea plant.
C is correct
Explanation:When considering the change that would occur in tube 3 containing water, bromthymol blue, and an aquatic plant (elodea) after 24 hours in bright light, we must take into account the process of photosynthesis. The presence of the aquatic plant will lead to the consumption of carbon dioxide and the production of oxygen.
Since bromthymol blue is an indicator that turns yellow in the presence of an acid (like carbonic acid formed when CO2 dissolves in water) and blue in the presence of a base (fewer hydrogen ions present when CO2 is consumed), the expected change should be: It would contain more oxygen (answer choice C), implying more CO2 will be consumed and less carbonic acid will be present.
This means the solution in tube 3 would likely change from yellow to blue over time (answer choice A). However, the question specifically asks about the change in gas concentration, thus 'it would contain more oxygen' is the most accurate description of the expected change due to the activity of the elodea performing photosynthesis.
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2. You consume a piece of candy that contains 150 glucose
molecules. Calculate the number of
1. carbon atoms you consumed:
Il hydrogen atoms you consumed:
ill. oxygen atoms you consumed:
When we consume a piece of candy we gain about 900 carbon atoms, 1800 hydrogen atoms and about 900 oxygen atoms.
Explanation:
The glucose molecule has a structure that contains 6 carbon atoms, 12 hydrogen atoms and about 6 oxygen atoms. The glucose is the only chemical that can go through the glycolysis, kerb cycle and the electron transport chain to yield ATP molecules.
This ATP molecules provide as a source of energy to the entire organism. The excess of glucose is stored in the form of glycogen in our body.
A(n) _____ bond joins these two oxygen atoms.
Answer:
Covalent bond
Explanation:
A diagram showing limited variations of life developing from the creation model would appear as: a tree a forest of unique trees a tree with different branches
Answer:
a forest of unique trees
Answer:
The answer would be A Forest of Unique Trees
Hope this helps.
-Que
Very long and large organic molecules called
Answer:
Macromolecules.
Explanation:
Molecules may be defined as the substance that are made up of the same or different molecules. Two main type of molecules on the basis of their structure and weight are macromolecules.
Macromolecules are made of the large number of subunits. They have large molecular weight and formed generally by the process of polymerisation. Organic macromolecules are carbohydrates, proteins and nucleic acid. Large number of atoms are involve in the formation of macromolecule.
Thus, the answer is macromolecules.
Which tool is most likely to be used to produce a clear image of very tiny structures inside a cell? a light microscope b electron microscope c magnetic resonance imaging d computer model
Electron microscope is most likely to be used to produce a clear image of very tiny structures inside a cell
Answer: B. Electron microscope
Explanation:
The electron microscope is a kind of magnifying instrument that utilises electrons to make a picture of the objective. It has a lot higher amplification or settling power than a typical light microscope. The tiny structures inside the cell are easily visible under the electron microscope.
The electron microscope can be scanning electron microscope or tunnelling electron microscope. Both the type of electron microscopes differ in function but uses electron as its source of illumination.
What is definition of law
Answer:
Answer in explanation
Explanation:
the system of rules which a particular country or community recognizes as regulating the actions of its members and which it may enforce by the imposition of penalties.
will mark brainliest
Answer:
The second one
Explanation:
As it says, there has been a rapid increase in global temperatures. Looking at the charts, we look at the year, then the temperature. In the first one, It goes from high, to higher, then to lower. So that one is incorrect. The third one, we start really high, then go lower. So that one is wrong. The last one starts high, then goes low, then high again. So that one is obviously wrong. The second one stars low, then goes higher. So, that one is the correct one. Does this help?
Answer:
I would go with option b while it is increasing at a more of a linear rate than exponential; it seems to be the only one really increasing.
Which of the following is an example of mutualism?
Answer:
One example of a mutualistic relationship is that of the oxpecker (a kind of bird) and the rhinoceros or zebra. Oxpeckers land on rhinos or zebras and eat ticks and other parasites that live on their skin. The oxpeckers get food and the beasts get pest control
The best example of mutualism among the given options is a. Lichens.
Mutualism is a symbiotic relationship in which both species involved benefit. A strong example of mutualism is found in lichens.
Lichens are not a single organism but rather a close association between a fungus (usually from the Ascomycota or Basidiomycota phyla) and a photosynthetic partner such as a eukaryotic alga or a prokaryotic cyanobacterium.
In this mutualistic relationship:
The fungus absorbs water and essential minerals from the surrounding environment (air, rock, or soil) and forms the structural body of the lichen called the thallus.The photosynthetic partner provides carbon and energy in the form of carbohydrates through photosynthesis, which is utilized by the fungus.Some cyanobacteria associated with lichens also fix atmospheric nitrogen, adding nitrogenous compounds to the relationship.This mutualistic partnership allows both organisms to thrive in environments where they might not survive individually. Therefore, among the given options, Lichens represent a clear example of mutualism.
complete question;
Which one of the following is an example of mutualism ?
a. Lichens
b. Hypertrophy
c. Cuscuta
d. Nepenthes
There are approximately 200 different types of cells in the human body although all cells are dependent on other cells to perform body functions. Explain how your model supports this statement
Answer:
Group of cells construct the organs of human body which helps our body to function properly.
Explanation:
All living things are made up of cells. Human body is constituted of approximately 200 cells. Not every cell functions equally. Different cells function differently. However, the cells which has the same work to do they combine to form tissues, and groups of cell constructs human organs like heart, lungs etc. which functions together to control the body.
So it can be said that though not directly but cells are indirectly dependent on each other to perform body function.
Answer:
The model shows that some cells make substances such as proteins for other cells to use and support their functions. So, the model shows that each particular type of cell relies on other cells to support all the functions in the human body.
Can someone please help ASAP !
Answer:
A
Explanation:
When water has little energy, it cannot carry the load of sediment, so it is deposited
Answer:
Explanation:
yes
which of these groups is the smallest level of classification
A. Phylum
B. Family
C. Order
D. Genus
Answer: Number D. Genus
Explanation:
Answer:
D. Genus
Explanation:
This is the smallest classification level because of all those named it is the one that covers the least organisms. This taxonomic level is between the level of species and family, that is, it covers only several related species. In order from largest to smallest the levels of organization are domain, kingdom, phylum, class, order, family, gender and species
Which of the following is NOT a major concept involved in the study of Earth Science?
a Earth's History
C Earth in the Solar System
b. The Structure of the Earth System
d. All are major concepts
Please select the best answer from the choices provided
Answer:
D
Explanation:
All are major concepts.
-Jarvis
Silver has two naturally occurring isotopes. Ag-107 has an abundance of 51.82% and a mass of 106.9 amu. Ag-109 has a relative abundance of 48.18% and a mass of 108.9 amu. Calculate the atomic mass of Silver.
Answer:
The atomic mass of silver is 107.86 amu
Explanation:
The atomic mass is calculated by formula
Atomic mass = (Mass of first isotope x Abundance of first isotope) + (Mass of Second isotope x Abundance of second isotope)
In case of silver, the formula will be as
Atomic mass = (Mass of Ag-107 x Abundance Ag-107) + (Mass of Ag-109 x Abundance Ag-109)
Mass of Ag- 107 = 106.9
Mass of Ag- 109 = 108.9
Abundance of Ag-107 = 51.82/100 = 0.5182
Abundance of Ag-109 = 48.18/100 = 0.4818
Putting these values in the formula
Atomic mass of silver = (106.9 x 0.5812) + (108.9 x 0.4818) = 107.86 amu
To calculate the average atomic mass of silver, the masses of its isotopes are multiplied by their relative abundances and summed up, resulting in an atomic mass of 107.841428 amu.
Explanation:The average atomic mass of an element can be calculated by taking the weighted average of the masses of its naturally occurring isotopes, based on their relative abundances. For silver, we have two isotopes: Ag-107 with a mass of 106.9 amu and an abundance of 51.82%, and Ag-109 with a mass of 108.9 amu and an abundance of 48.18%. To find the atomic mass of silver, we perform the following calculation:
Atomic mass = (Percentage abundance of Ag-107 × Mass of Ag-107) + (Percentage abundance of Ag-109 × Mass of Ag-109)
Atomic mass = (0.5182 × 106.9 amu) + (0.4818 × 108.9 amu)
Atomic mass = 55.359866 amu + 52.481562 amu
Atomic mass = 107.841428 amu
Therefore, the average atomic mass of silver is 107.841428 amu.
285 in scientific notation would be
o 2.85 x 102
285.0
28.5 x 10
EESTE
285 x 103
12.8 x 10²
Answer:
[tex]2.85 \times {10}^{2}[/tex]
which of these nutrients can be found in all organic compoumds
Answer: proteins and vitamins
Explanation:
The nutrients that contain carbon in their structural makeup are referred to as organic nutrients, whereas those that do not contain carbon are called inorganic nutrients. Therefore, the organic nutrients are carbohydrates, lipids, proteins and vitamins. These nutrients are important for energy.
Which of the following was evidence cited by Alfred Wegener that the continents were once one large land mass he called Pangaea?
Similar fossils were found around the world
The ages, layers, and types of rocks on mountains in separated continents were the same
The shapes of the continents looked like they could fit together
All of the above
Answer:
D. All of the above.
Explanation:
Alfred Wegener was certain than continents were once gathered together in a gigantic landmass known as Pangaea.
To support this theory, he collected different pieces of evidence:
Fossil evidence: Wegener stated that various fossils from plants and animals that were found on separate continents were located there and nowhere else, which suggested that these continents were once joined. For instance, the fossils of a freshwater reptile known as Mesosaurus are found in both Southern Africa and Eastern Southern America. As it is unlikely for this animal to move between both continents, it is suggested that both continents were once joined.Ages, layers, and types of rocks: Wegener matched rocks from separated continents and realized that they matched like puzzle pieces. He stated that mountain ranges that are located on opposite sides of the Atlantic Ocean possess the same rock ages, types, and layers. The shapes of continents look like they fit together: Alfred Wegener also suggested that the shape of separated continents looked like they were once joined. In fact, in 1910, he wrote to his wife the following thought: "Doesn't the east coast of South America fit exactly against the west coast of Africa, as if they had once been joined?"What hands-on training program is required for doctors?
Answer:
Family medicine residency programs accredited by the Accreditation Council for Graduate Medical Education (ACGME) require three years of training. As with other specialties, family medicine residency programs have specific requirements with certain numbers of hours that must be completed for board certification.
HOPE THIS HELPED!!!!!!!!!!!!!!! XDDDDDDDDDDDD
Doctors require hands-on training programs like clinical rotations, internships, and residencies to gain practical experience before practicing independently.
Hands-on training programs required for doctors typically include clinical rotations during medical school, internships, and residencies. During these programs, doctors gain practical experience working with patients under the supervision of experienced professionals. For example, after graduating from medical school, doctors in the United States must complete a residency program in their chosen speciality to become fully licensed.
9. This part of Burt's brain helps him produce language?
a hypothetical cell has approximate shape of a shape of a sphere. rhw diameter of thw spherical cell os six units long. another cell is shpaed like a cylider which has the diameter of 6 units and a height or length of 400 units long. determine the volum of both.
Answer:
The sphere: volume is about 113.1
The cylinder: Volume is about 11309.73
Explanation:
This is done by using the formula for the volume of a sphere ( v=4/3 pi r^3) and the formula for the volume of a cylinder (v=pi r^2 h). You plug in things such as radius, height, and pi or 3.14 into a calculator.
The volume of the spherical cell is 36π cubic units, while the cylindrical cell's volume is 3600π cubic units. The volume of a cell has a significant impact on its function and efficiency.
Explanation:
The question is asking to determine the volume of two different cells: a spherical cell and a cylindrical cell, both have a diameter of 6 units, with the cylindrical cell having a height of 400 units.
In geometry, volume describes the amount of space an object occupies. The formula to calculate the volume of a sphere is V = 4/3πr³ and for a cylinder, it is V = πr²h. Here, r stands for radius and h stands for height.
In the case of the sphere, since the diameter is given as 6 units, the radius would be 3 units. So, the volume of sphere would be V = 4/3*π*3³ = 36π cubic units.
For the cylindrical cell, the diameter is also 6 units, making the radius 3 units. The height is given as 400 units. The volume of the cylinder would be V = π*3²*400 = 3600π cubic units.
These calculations can give you the volume of the cell shapes, and further helps you understand how size and shape can affect a cell's function and efficiency.
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