In a Lab session, you were asked to:
1. Model one of the chemical reaction types: Synthesis, Decomposition, or replacement.
2. List the elements/ compounds you used in your reaction.
3. Describe the reaction as endothermic or exothermic. Justify your answer.
4. Record a video demonstrating the modelling.
5. Explain how a closed system is suitable for your reaction. Relate your answer to law of conservation of mass.
6. During the reaction, the reactants had a potential energy of 400 KJ. As for the final products it had 200 KJ. Demonstrate the reaction by drawing the graph.
7. Identify if the reaction is an exothermic or endothermic reaction. Explain.
8. Interpret the factors that might affect your reaction rate.
Answers
The synthesis reaction of the formation of water is an exothermic reaction because heat is given off during the reaction.
What model reaction was chosen?The model reaction chosen is a synthesis reaction where two or more substances form another compound.
The description is as follows:
Chemical Reaction Type: Synthesis ReactionElements/Compounds used: Hydrogen gas (H2) and Oxygen gas (O2)The reaction is exothermic. When hydrogen and oxygen react to form water, energy is released in the form of heat and light. This indicates that the reaction is exothermic.A closed system is suitable for this reaction because it follows the law of conservation of mass. In a closed system, no mass is lost or gained during the reaction. The mass of the reactants equals the mass of the products. In this case, hydrogen and oxygen combine to form water, and the total mass of the reactants equals the total mass of the products. Therefore, a closed system is suitable for this reaction.The potential energy of the reactants is 400 KJ, and the potential energy of the products is 200 KJ. The graph for this reaction would show a downward-sloping line, indicating that energy is released as the reaction progresses.The reaction is exothermic because energy is released during the reaction, as indicated by the decrease in potential energy from the reactants to the products.Factors that might affect the reaction rate include temperature, pressure, and the presence of a catalyst. Increasing the temperature or pressure would increase the reaction rate, while the presence of a catalyst would decrease the activation energy required for the reaction to occur, leading to a faster reaction rate.Learn more about exothermic reactions at: https://brainly.com/question/2924714
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Related Questions
which of the following ecosystem types has the least amount of vegetation present? question 7 options: maritime forest dunes estuaries mud flats
Answers
Dunes has the least amount of vegetation present.
Natural vegetation is a plant community that has grown naturally without human intervention and has been left undisturbed by humans for an extended period of time. This is known as natural vegetation. Thus, cultivated crops and fruits, as well as orchards, are considered vegetation, but not natural vegetation.
Temperature and moisture influence vegetation growth. It is also affected by factors such as slope and soil thickness. Because of variations in these factors, the type and thickness of natural vegetation varies from place to place.
Plant species that colonize dunes have deep roots that reach for the water table, root nodules that produce nitrogen compounds, and fleshy stems and leaves that aid in water retention.
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What is the answer please
Answers
Answer:For comparison, the eccentricity of the Earth's much more circular orbit is only 0.0167. Mercury, as the innermost planet, is also the fastest moving major planet in the solar system . The mean orbital velocity is about 48 km/s (the Earth moves at 30 km/s).
Which section is not part of the cell theory
Answers
Answer:
it is accepted that cells contain DNA in chromosomes and RNA in the nucleus and cytoplasm, but only in the modern cell theory. the classical cell theory does not include this. ... though prokaryotes (e.g. bacteria) contain DNA, they lack a nucleus.
Explanation: prokaryotes is the answer
YOVE
2) If you travel north from the equator, what is the general rule
regarding the intensity of ultraviolet (UV) light?
Answers
When we travel north from the equator, the intensity of Ultra violet light will decreases.
What is Ultraviolet light?Ultraviolet (UV) radiation is defined as the type of non-ionizing radiation that is produced naturally by the Sun. There are three types of UV radiation which are as follows:
1. UVA
2.UVB
3. UVC
The intensity of the UV radiation is higher at the equator and decreases with latitude. The UV radiation intensity decreases which is the lowest at the poles.
Thus, when we travel north from the equator, the intensity of Ultra violet light will decreases.
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When heating a substance in a test tube, it is permissible to look into the test tube or to point the tube in the direction
of other students
a True
b. False
Answers
Answer:
False.
Explanation:
It's very dangerous.
Whale primary functions
Answers
The primary functions of whales include feeding, reproduction, communication, and migration.
Whales are primarily filter feeders or predators, depending on the species.
Filter-feeding whales, such as baleen whales, have baleen plates in their mouths that allow them to filter out small prey, such as krill or small fish, from large volumes of water.
Predatory whales, such as toothed whales, hunt and feed on various marine organisms, including fish, squid, and marine mammals.
Reproduction is another important function for whales. Most whale species have a gestation period of several months, with females giving birth to a single calf.
The calves are nursed with milk from their mothers and rely on their care for a period of time until they become independent.
Communication is vital for whales, as they rely on vocalizations to communicate with other members of their pod.
Whales produce a variety of sounds, including songs, clicks, and whistles, which serve purposes such as mating, social interactions, and navigation.
Migration is a common behavior observed in many whale species. Whales undertake long-distance migrations, often covering thousands of kilometers, to reach feeding grounds in nutrient-rich waters or to reproduce in specific breeding areas.
These migrations are driven by seasonal changes in food availability and environmental conditions.
In summary, the primary functions of whales encompass feeding, reproduction, communication, and migration, all of which are essential for their survival and successful adaptation to their marine environments.
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gram stain is a laboratory technique used to distinguish between various kinds of bacteria based on the characteristics of the ______________.
a. Cell wall
b. Chitin
c. Obligate aerobes
d. Purple
Answers
The Gram stain is a laboratory technique used to distinguish between various kinds of bacteria based on the characteristics of the cell wall. Here option A is the correct answer.
The cell wall is an essential component of bacterial cells and plays an important role in maintaining cell shape and protecting the cell from environmental stressors. The Gram stain takes advantage of the fact that different types of bacterial cell walls react differently to certain chemicals.
During the Gram staining procedure, bacterial cells are first stained with crystal violet and then treated with a decolorizing agent and a counterstain.
Gram-positive bacteria retain the crystal violet stain and appear purple under a microscope, while Gram-negative bacteria lose the crystal violet stain and take up the counterstain, appearing pink or red under a microscope.
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Plant 2 is produced from plant 1. If the leaf cells of plant 1 have 56 chromosomes. How many chromosomes will be found in the leaf cells of plant 2
Answers
Answer:
Explanation:
Now, being completely identical to plant 1, plant 2 will have 56 chromosomes in it's leaf cells.
What is photosynthesis?
Answers
Answer:
the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.
Explanation:
Select the correct answer.
A gene with the sequence ATTCATTCA underwent duplication after a few generations. Which sequence represents this gene after the mutation?
Group of answer choices
ATCATTCA
ACTTACTTA
ATTCACATTCA
ATCCATTCA
ATTCATTCA
Answers
Answer: ATCATTCA
Explanation:
during the light-dependent reactions of photosynthesis, what directly drives the synthesis of atp?
Answers
Answer:
The proton-motive force drives ATP synthesis through the action of an ATP synthase, homologous to that in oxidative phosphorylation. In the dark reactions, the NADPH and ATP formed by the action of light drive the reduction of CO2 to more-useful organic compounds.
Explanation:
We now know that africa was where humans evolved and thrived for millions of years before migrating elsewhere. What evidence supports this idea?.
Answers
The oldest fossils of Homo sapiens were found in Africa about 195,000 years ago. Homo sapiens fossils found outside of Africa are not that old. In general, the closer a country is to Africa, the older its Homo sapiens fossils.
This supports African origins. Although there is still evidence that all modern humans descended from African populations of Homo sapiens that spread out of Africa about 60,000 years ago, it also indicates that they interbred fairly extensively with local archaic populations. (Neanderthal and Denisovan genes are found in everyone living outside). African. Millions of stone tools, figurines, paintings, footprints, and other traces of human activity in the prehistoric record tell the story of where and how early humans lived and when certain technological innovations were invented. increase.
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Found in both plant cells and animal cells, the________________surrounds and protects the cell, and allows certain chemicals to enter and exit the cell.
cell wall
cell membrane
cytoplasm
(This is 7th grade science).
Answers
Answer:
cell wall
Explanation:
The cell wall is the protective, semi-permeable outer layer of a plant cell
Answer:
cell membrane
Explanation:
cell membrane found in both plant cells and animal cells.
It is the outermost part of animalcell and second layer of plant cells.
Hope this answer help you
the digestive system can be thought of as a long tube with how many openings? a.) 1 b.) 3 c.) 2 d.) 4
Answers
The digestive system can be thought of as a long tube with 2 major openings that is mouth and anus, which suggests that option C is the right answer.
Digestive system is the organ system in the body which produces enzymes and other juices to digest the food that we take in. These enzymes break the complex particles into smaller ones. The first opening of digestive system comes form the mouth itself while the next opening goes towards the anus. Alimentary canal, mouth, esophagus, stomach, small intestine, large intestine etc. are the main parts of digestive system. Millions of microscopic finger-like projections called villi line the inside of the small intestine.
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a. briefly explain the concept of a balanced scorecard. what general factors are included in a typical balanced scorecard?
Answers
A balanced scorecard is a strategic management tool that considers multiple factors to evaluate organizational performance. A typical balanced scorecard includes financial, customer, internal process, and learning/growth perspectives.
The balanced scorecard is a strategic management tool used to measure an organization's performance against a set of key performance indicators (KPIs) across multiple perspectives.
The four perspectives typically included in a balanced scorecard are financial, customer, internal processes, and learning and growth. The financial perspective evaluates an organization's financial performance and objectives.
The customer perspective evaluates an organization's performance from the perspective of its customers. The internal processes perspective evaluates the effectiveness and efficiency of an organization's internal processes.
The learning and growth perspective evaluates an organization's performance from the perspective of its human capital, innovation, and infrastructure.
By incorporating these different perspectives, the balanced scorecard provides a comprehensive view of an organization's performance and helps align an organization's strategy and objectives with its operations. It helps organizations identify areas where they are excelling and areas where they need to improve.
By regularly monitoring and adjusting their performance against these KPIs, organizations can improve their overall performance and achieve their strategic objectives.
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The concept of a balanced scorecard is a strategic performance management tool that organizations use to measure and manage their overall performance.
It provides a balanced view by considering multiple dimensions of performance beyond just financial metrics.A typical balanced scorecard includes four main categories of factors:Financial Perspective: This category focuses on financial objectives and measures, such as profitability, revenue growth, cost reduction, and return on investment. It helps assess the organization's financial health and its ability to generate value for stakeholders.Customer Perspective: This category emphasizes customer-oriented objectives and measures, aiming to gauge the organization's success in meeting customer needs and creating customer value. Metrics may include customer satisfaction, market share, customer retention, and new customer acquisition.Internal Process Perspective: This category examines the organization's internal operations and processes to ensure efficiency, effectiveness, and quality. It looks at key processes, innovation initiatives, operational metrics, and other factors relevant to achieving the organization's strategic objectives.Learning and Growth Perspective: This category focuses on the organization's capacity for continuous learning, improvement, and innovation. It includes metrics related to employee training and development, employee satisfaction, knowledge management, and technological capabilities.By considering these four perspectives, the balanced scorecard provides a holistic view of an organization's performance. It helps align different areas of the organization, encourages a balanced approach to decision-making, and enables managers to track progress towards strategic objectives.
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a. there will be excessive algae growth that stems from phosphorus which is found in rocks and deep ocean sediment. which leads to a lot of deaths in the ecosystem. true or false
Answers
The given statement "There will be excessive algae growth that stems from phosphorus which is found in rocks and deep ocean sediment. Which leads to a lot of deaths in the ecosystem" is partly true.
Phosphorus is a nutrient that is naturally found in rocks, soil, and ocean sediment. It is essential for plant growth and is a primary component in many fertilizers. However, excessive amounts of phosphorus can cause algae blooms that lead to oxygen depletion and other problems that may affect aquatic organisms in the ecosystem. Thus, the given statement is true to a certain extent. As algae grow, they take in oxygen and nutrients from the water, including phosphorus. When they die, they sink to the bottom, where bacteria decompose them. This process consumes oxygen, reducing the amount of oxygen available to other organisms. In extreme cases, it may result in a hypoxic or anoxic zone, where there is no oxygen left. This can lead to the death of many organisms in the ecosystem. Therefore, it is important to regulate the amount of phosphorus released into the ecosystem to avoid excessive growth of algae, and hence, deaths in the ecosystem.
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solutes in the plasma contribute to what driving force in capillary filtration?
Answers
Which three observations are caused by plate tectonics?
Answers
Answer:
mountain ranges. valleys. volcanoes. these can also cause earthquakes which will cause other things.
Explanation:
Which of the following is NOT a function of the catalyst?
Answers
Answer:
the correct Question is B-
Explanation:
A catalyst increases the rate of a chemical reaction by decreasing activation energy. So I used the power of marking out the ones i knew were incorrect. Hope this helps.
what is a cell that is the source of other cells
Answers
Answer:
stem cells
Explanation:
which of the following is utilized to distinguish between members of the family enterobacteriaceae and differentiate them from other gram-negative rods?
Answers
Citrate test, indole test, and MRVP test will be utilized to distinguish between members of family Enterobacteriaceae and differentiate them from the other gram-negative rods. Option D is correct.
Citrate test; This test determines the ability of an organism to utilize citrate as a sole carbon source for growth. Members of the Enterobacteriaceae family typically do not utilize citrate, while other gram-negative rods may exhibit citrate utilization.
Indole test; This test examines the ability of bacteria to produce indole from the amino acid tryptophan. Some members of the Enterobacteriaceae family, such as Escherichia coli, produce indole, while others do not. This test helps in distinguishing between different species within the family.
MRVP test; The MRVP (Methyl Red-Voges-Proskauer) test is actually two separate tests. The Methyl Red (MR) test detects organisms that produce and maintain stable acid end products from glucose fermentation.
Hence, D. is the correct option.
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--The given question is incomplete, the complete question is
"Which of the following is utilized to distinguish between members of the family Enterobacteriaceae and differentiate them from other gram-negative rods? A) Citrate test B) indole test C) MRVP test D) All are correct."--
There are four main types of macromolecules that are synthesized and used in the metabolic processes of living cells. Name the type of molecules that are built from amino acids in the ribosomes of eukaryotic cells.
A. carbohydrates
B. lipids
C. proteins
D. nucleic acids
Answers
Answer:
C I'm pretty sure
Explanation:
in your lab, you have added Gram Stain to an unknown bacterium. The stain shows up as a dark
purple, unlike the regular bacteria you are researching (which is pink). What does this information tell
you about the structure of each bacteria?
Answers
This information tells you that the unknown bacterium has a Gram-positive cell wall, while the regular bacteria being researched have a Gram-negative cell wall.
What does Gram staining tell about the bacterium?The color of the unknown bacterium after Gram staining indicates that it has a different cell wall structure than the regular bacteria being researched. Gram staining is a laboratory technique used to differentiate between different types of bacteria based on their cell wall composition. Bacteria that appear purple after Gram staining have a thicker peptidoglycan layer in their cell wall, known as a Gram-positive cell wall. Bacteria that appear pink have a thinner peptidoglycan layer, known as a Gram-negative cell wall.
This information can be useful in determining the type of bacteria and in selecting appropriate treatments, as different antibiotics and other treatments are effective against different types of bacteria based on their cell wall structure.
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if 108 out of 300 individuals in a population expresses the recessive phenotype what percent of the population are heterozygous
Answers
Answer: q = 0.2 and p+q then p=0.8 (80%)
Explanation:
chemical substances that are produced and secreted within the central nervous system are called
Answers
The chemical substances that are produced and secreted within the central nervous system are called neurotransmitters.
The function of neurotransmitters is to carry information between neurons and other cells, such as muscles or glands. There are various types of neurotransmitters, and each one is associated with a specific type of behavior or physiological process.
For example, dopamine is linked to pleasure and reward, while serotonin is involved in mood regulation and appetite control. Neurotransmitters can either excite or inhibit the activity of the cells they communicate with, depending on the specific receptor they bind to.
When a neurotransmitter binds to its receptor, it triggers a series of biochemical events that lead to the activation or inhibition of the target cell.
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What characteristic of carbon dioxide causes it to suffocate people next to the ground?
A volcanic lake exists near where your friends and family live. How would you make sure that the volcanic lake is not in danger of releasing carbon dioxide gas?
Answers
Characteristic of carbon dioxide causes it to suffocate people next to the ground because Carbon dioxide is a toxicant in addition to being a cause of asphyxiation via hypoxia.
It has been demonstrated that at high doses, it can induce unconsciousness practically immediately and respiratory arrest within one minute.
Look for shelter inside. Roll into a ball if you get caught in a rockfall to protect your head. Be mindful of rising water and potential mudflows in low-lying regions if you're close to a stream or river. Move as swiftly as you can upslope. For burns, seek treatment straight soon.
Quick medical attention can save lives. Move away from the area right away if volcanic gases and fumes irritate your eyes, nose, or throat. When you are no longer in contact with the gases or fumes, your symptoms should go away. If the symptoms persist, see a doctor.
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2. The pedigree shows the phenotypes for hair color in a family over four
generations.
In this pedigree, light hair color is the recessive allele, and dark hair color is
the dominant allele.
Which Punnett square shows the possible genotype for offspring W's hair
color?
d
d
D
Dd
Dd
d
dd
dd
B. D
D DD
d
DD
d Dd Dd
D
D Dd
d Dd
d
Dd
Dd
D.
D
D
Dd
d Dd
d
DD
dd
W
FAMILY PEDIGREE
8-0
or
of
Key
Dark hair color
O Light hair color
Male
Female
Answers
The pedigree shows that over the four generations, there are both dominant and recessive alleles present.
What is an Allele?An allele is a genetic variety. Alleles can be either dominant or recessive, and they determine a person's hereditary characteristics such as eye color, hair color, and other physical traits. Every gene has at least two alleles, which are inherited from one's parents. Alleles can be the same or different, and the presence of certain alleles can affect the expression of a trait.
In the first generation, both the father and mother have dark hair color, showing a dominant allele. In the second generation, two of the children have dark hair color, again showing a dominant allele, while the other two children have light hair color, showing a recessive allele. In the third generation, two of the children have dark hair color, again showing a dominant allele, while the other two children have light hair color, showing a recessive allele. Finally, in the fourth generation, two of the children have dark hair color, again showing a dominant allele, while the other two children have light hair color, showing a recessive allele.
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The QRS complex represents: a. depolarization of the atria. b. repolarization of the atria and depolarization of the ventricles. c. depolarization of both the atria and ventricles. d. repolarization of the ventricles.
Answers
The QRS complex represents the depolarization of both the atria and ventricles. the QRS complex is a series of electrical waves that occur during the contraction of the heart's ventricles.
These waves are generated as a result of the spread of electrical impulses from the atria to the ventricles, which causes the depolarization of both the atria and ventricles. Repolarization of the ventricles occurs during the T wave. The QRS complex is a component of an electrocardiogram that indicates the electrical activity within the heart.
Specifically, the QRS complex represents the depolarization of the ventricles, which is the process by which the electrical charges within the ventricular muscle cells change to initiate contraction. This is crucial for the proper functioning of the heart, as it allows the ventricles to pump blood throughout the body. The correct answer is option b. repolarization of the atria and depolarization of the ventricles.
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homeostasis refers to the ability of the body to maintain a stable internal environment despite changes in external conditions true or false ?
Answers
The answer is TRUE
.......................
Answer:
It's true
Explanation:
A scientist is performing an experiment to determine the melting point of a new substance. Which action could increase the likelihood of obtaining accurate results?
Answers
Explanation: