PLEASE HELP! ANSWER CHOICES ARE BELOW!! :D Two chemist are trying to determine if their water sample is a mixture or pure substance. In their investigation they first filter the sample of dirty water with gravel. The water is then clearer than before. See image. What does this change tell the chemist about the chemical make up of the sample?
A. The water before filtration is a pure substance, because the particles did not maintain their chemical properties.
B. The water before filtration is a mixture because the particles could be physically separated.
C. More information is needed to answer the question.
D. The water before filtration is a mixture because it cannot be physically separated and must be chemically separated.
The correct answer is: B. The water before filtration is a mixture because the particles could be physically separated.
A mixture is composed of more than one individual substances that can be separated using different methods (depending on the type of mixture). Methods for the separation include filtration, evaporation, distillation and chromatography. The dirt stays behind in the filter paper (it becomes the residue) andthe water passes through the filter paper (it becomes the filtrate).
What is top soil? How do living things help form topsoil?
Topsoil is the upper, outermost layer of soil, usually the top 2 inches to 8 inches. It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs. Four elements constitute the composition of soil.
Animals burrowing and plant roots growing down into the soil create the pores in the soil for the air and the water.
The organic matter in the soil comes from the decay of dead plants and animals. Earthworms, bacteria and fungi are just a few of the organisms that live in the soil, feed on the organic matter and decay or recycle plant nutrients. All of the organisms that live in the soil are such an important part of the continuous, natural process of decomposing organic materials and preparing the soil for future plant growth
In an experiment, what is the factor that is tested? control specimen hypothesis variable
The factor being tested is the variable. There are two types of variables, independent and dependent. The independent variable is the factor being changed by the scientist or the person controlling the experiment. The dependent variable is the thing that gets changed due to the changing of the independent variable. The dependent variable cannot be changed physically by the person doing the experiment.
In an experiment, the factor that is tested is termed as the variable. It can be defined as any characteristic, condition, or value that can be manipulated or tested within the experiment's parameters.
Explanation:In an experiment, the factor that is tested is known as the variable. The variable can be defined as the characteristic, condition, or value that can be changed or controlled in an experiment.
It's essentially what is being manipulated or tested in the experiment. For example, if you are studying the effects of sunlight on plant growth, the variable could be the amount of sunlight the plants receive.
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If the activation energy required for a chemical reaction were reduced, what would happen to the rate of the reaction?
The activation energy as per the definition given by Svante Arrhenius is the minimum amount of energy that is needed for the chemical reaction to proceed. If the amount of the activation energy is decreased then, the reaction would be completed faster.
Explanation:
A catalyst is defined as the substance that lowers the activation energy of a chemical reaction without itself getting consumed so that there will be increase in rate of reaction.
As catalyst lowers the activation energy so, reactant molecules with lower energy also participates in the reaction. Hence, more collisions occur due to which there is rapid formation of products.
Thus, we can conclude that if the activation energy required for a chemical reaction were reduced then there will occur an increase in the rate of the reaction.
Why is the cliff worn away the most near or under the level where the water is?
A.
because fish and animals who live in the water tear up the cliff
B.
because changes in temperature are greater in the water
C.
because the moving water is what wears away the cliff
D.
because the cliff is softer beneath the water line
The moving water wears away the cliff because waves exert hydraulic action, abrasion, and chemical solution that erode the base of sea cliffs. Answer is C)because the moving water is what wears away the cliff
The correct answer is C. because the moving water is what wears away the cliff. This phenomenon occurs due to wave erosion. Waves crashing against the base of sea cliffs exert significant hydraulic action, abrasion, and chemical solution, causing erosion. Over time, this undercutting leads to the formation of features such as wave-cut platforms, sea arches, and sea stacks.
what is the difference between predation and competition
In predation, one population is the resource of the other. One can conceptualize competition as occurring horizonatally on the same resource level, while predation takes place vertically between different resource levels. Competition and predation comprise environmental pressures on the interacting populations.
Order the steps of protein synthesis. Amino acids are lined up in a sequence. DNA is transcribed. RNA is modified into mRNA. A ribosome binds to mRNA. Chemical bonds are formed and a protein is produced.
steps involved in protein synthesis:
DNA is transcribed.RNA is modified into mRNA. A ribosome binds to mRNA. Amino acids are lined up in a sequence. Chemical bonds are formed and a protein is produced.Explanation:The synthesis of proteins takes two steps: transcription and translation. Transcription takes the information encoded in DNA and encodes it into mRNA, which heads out of the cell's nucleus and into the cytoplasm. During translation, the mRNA works with a ribosome and tRNA to synthesize proteins.
Climate can have a big impact on populations. Why do you think that heat-related deaths can be greater in cities at higher latitudes than in more tropical cities?
The aerobic phase of cellular respiration in the mitochondrion produces a net of about 28 to 30 ATP molecules. How does this compare to the energy released in glycosis?
Answer:
More ATP is produced in mitochondria
Explanation:
Glycolysis is the first stage of cellular respiration. It is a common process of both anaerobic and aerobic respiration. It occurs in the cytoplasm of a living cell. During glycolysis 4 ATP and 2 NADH is produced and 2 ATP is used up. Thus, there is net gain of 2 ATP. The completion of cellular respiration takes place in mitochondrial matrix and on inner membrane, where all the co-enzymes NADH and FADH₂ oxidised to release ATPs. On oxidation each NADH produce 3ATP and each FADH₂ produces 2 ATP. Total 10 NADH is produced during complete oxudation which yield 30 ATP and 2 FADH₂ yields 4 ATP. Thus, in the mitochondria more ATP is produced as compared to glycolysis.
The aerobic phase of cellular respiration where a net amount of 28 to 30 ATP is generated is distinct from glycolysis in terms of the amount of energy generated because only 2 ATP are generated from the latter.
During glycolysis, glucose molecules undergo a series of reactions in which 2 molecules of pyruvates result along with 2 molecules of ATP as well as 1 molecule of NADH. More specifically, 4 ATP are produced but 2 are consumed back in the process, meaning that the net number of ATP produced is 2.
If this amount of ATP is compared to the aerobic phase of cellular respiration (Kreb's cycle and electron transport chain), one would see that about x14 to x15 of the amount of energy generated in glycolysis is produced in the aerobic phase.
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Using the group of cards just described in this lesson, the probability of drawing a red five is 1/14, 1/100, 1/56, 7/56
The probability that you could draw a red five is 1/56
When a baby was five months old she weighed 8 kg after seven years the baby has grown into a girl weighing 25 kg where did her increase in mass come from
The girls mass would have increased as she is growing and the bones in her body are growing and becoming stronger. Her weight would also change drastically as she’s getting older. Peak bone mass is influenced by a variety of factors: some that you can't change, like gender and race, and some that you can, like nutrition and physical activity. Calcium is an essential nutrient for bone health. A well-balanced diet including adequate amounts of vitamins and minerals such as magnesium, zinc, and vitamin D is also important.
The increase in mass as a child grows can be attributed to the natural growth patterns which include rapid weight and length gains during infancy, followed by a pubertal growth spurt in girls around 8-9 years old.
The question of where a child's increase in mass comes from as they grow is answered by understanding the biology of human growth. Initially, a baby may experience rapid growth in both weight and length, with an average gain of about 28 g (1 oz) per day during the first two months, and then around 0.45 kg (1 lb) per month for the remainder of the first year. This trend means an infant typically doubles their birth weight by six months and triples it by one year.
As children age, growth rates vary. Between the age of 4 and 6, growth tends to slow down, with children gaining 5-7 pounds and growing approximately 2-3 inches per year. However, as girls approach the ages of 8-9, they experience a pubertal growth spurt, outpacing the growth rate of boys, and this spurt continues until around 12 years old. During this time, girls also begin their menstrual cycles, which coincides with their most rapid period of growth.
Therefore, the increase in mass of the girl from the age of 5 months to 7 years can be attributed to the natural and expected growth patterns during early life, including both the gradual weight gain from infancy and the more pronounced growth spurt associated with puberty.
Match the description of each plants with the group to which the plant belongs. (Match each number to a letter please!)
1. a vascular plant that produces cones to house seeds
2. a vascular plant that does not produce seeds
3. a short, nonvascular plant that contain rhizoids
4. a flowering vascular plant that produces fruit around seeds
A. bryophyte
B. pteridophyte
C. gymnosperm
D. angiosperm
The right matches are :
A. bryophyte ==> 3.
B. pteridophyte ==> 2.
C. gymnosperm ==> 1.
D. angiosperm ==> 4.
These four types of plants are cormophytes.
Bryophyte is a terrestrial plant belonging to the family Bryophyta, which does not have a real vascular system.
Gymnosperms are the first order of didynamy containing phanerogamous plants whose eggs are not enclosed in closed carpels.
Angiosperms are plants whose seeds are enclosed in a closed ovary.
Pteridophytes produce neither flowers nor seeds but are vascular plants.
Answer:
The right matches are :
A. bryophyte ==> 3.
B. pteridophyte ==> 2.
C. gymnosperm ==> 1.
D. angiosperm ==> 4.
Explanation:
In the picture below how would you describe the cell organelle and its function for letter A
Are mushrooms alive?- Is it living or non living?
Why?
Using Iodine, what indicates the presence of a complex carbohydrates
Hi. OP do not mind this. This is for the mods. im a rebel. cant wait to get banned. dont worry mods this is an alt. lol
Describe how models are used to predict phenomena.
Models are utilized to predict and make phenomena easier to understand. They come in various forms, like mathematical models which accurately predict one value from another. Others, like statistical models, offer a range of probable outcomes, acknowledging uncertainty.
Explanation:Models, being mathematical or otherwise, are tools that scientists and researchers use to predict and understand phenomena. They provide simplified depictions of more complex real-world processes, making them visual and tangible. For example, mathematical models in statistics are used to describe and predict phenomena. These models, like deterministic models, can predict a value from another with a high degree of precision. They are used in diverse fields, like space agencies to predict things like the thrust a rocket needs to escape Earth's gravity.
In physics and chemistry, three-dimensional models are used to visualize complex molecules. Furthermore, computer simulations can model processes like star or planet formation. They can simulate past events or events that occur too quickly or slowly to observe directly. They also allow for virtual experiments where variables can be altered to observe different outcomes.
Lastly, statistical models like those used in meteorology to predict weather, illustrate the likelihood of events. Unlike deterministic models, they acknowledge uncertainty, offering a range of possible outcomes. This allows us to prepare for the different potential scenarios.
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The speed of all electromagnetic waves through space is 300,000,000 m/s. What is the frequency of a radio wave that has a wavelength of 10m?
A radio wave with a wavelength of 10 meters and has a frequency of (300,000,000 / 10) = 30 MHz.
300,000,000 meters = 186,282 miles
A radio wave with a wavelength of 10 miles has a frequency of (186,282 / 10) =
18,628 Hz.
there are not many deserts on earth true or false
Which factor would not increase the production of glucose by photosynthesis in plants? A) increased exposure to sunlight Eliminate B) extra rainfall C) freezing temperatures D) increased carbon dioxide levels
I think the correct answer is C.
Answer:
The correct answer would be C) freezing temperatures
Photosynthesis is the natural process by which plants synthesized their food with the help of sunlight and chlorophyll.
The carbon dioxide and water are the substrate and glucose and oxygen are the products to this process.
Increase in the amount of sunlight, carbon dioxide increases the rate of photosynthesis until the maximum rate of photosynthesis is achieved.
However, temperature shows the bell-shaped curve when it is placed against the photosynthesis rate. The photosynthesis rate is efficient under optimum temperature range. Beyond this range, that is, extreme temperature (whether extreme heat or cold) decreases the rate of the photosynthesis.
Technology has changed the way scientist conduct their research. Provide two pieces of evidence from the film to support this claim:“Technology is crucial for lion research in Gorongosa National Park
The evidence to support eth claim are:
GPS TrackingCamera TrapsIn the film on lion research in Gorongosa National Park, two key pieces of evidence highlight how technology has transformed the way scientists conduct their research:
1. GPS Tracking: Scientists use GPS collars fitted on lions to monitor their movements in real-time. This technology allows researchers to collect precise location data, helping them understand lion behavior, territories, and interactions, which would have been challenging without technology.
2. Camera Traps: The film shows the use of camera traps equipped with motion sensors. These devices capture images and videos of lions and other wildlife, providing invaluable insights into their behavior and population dynamics without direct human presence.
These examples illustrate how technology enhances the efficiency and depth of scientific research in studying lions and wildlife in the park.
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Identify and describe the eight steps done during an autopsy
Before performing the procedure, the experts need to take the photographs of each and every inch of the body.
X-Ray examinationThe corpse is carefully examined by X-Ray
Incising the bodyA Y shaped incision is given from shoulder to groin region (thus exposing the internal contents of the body)
Removal of abdominal contentsThe abdominal contents are removed (one by one or in some cases as a whole)
ExaminationAfter removing, the contents are weighed and examined.
Lab investigationsFluid specimens are obtained for laboratory examinations.
Placing back the contentsAfter the procedure is done, the contents are put back in the body in the same location.
SealingThe body is then closed /sealed by suturing.
was phenylthiourea a competitive inhibitor or a noncompetitive inhibitor?
Phenoloxidase is a key enzyme of melanization catalyzing the oxidation of phenols. Phenylthiourea (PTU) is the well-known and widely used inhibitor of phenoloxidase. However, the mechanism of its action is not quite clear.
What are the “workers” of the cells?
They are called Ribosomes, they are the workers because they a-line the cell
How does sexual reproduction increase the genetic diversity among a population? ANSWER CHOICES: A) increasing mutation rate in offspring B) increasing mutation rate in parents C) copying genes from 1 parent to form many offspring D) combining genes from 2 parents into 1 offspring
I have to say D is the most logical answer
suppose that the amino acids that make up an enzyme’s active site are changed. how might this change affect the enzyme?
Enzymes are biological catalysts that bind with chemical compounds known as substrates.
What is the enzyme-substrate relationship?The enzyme has a specific site for the substrates to bind. The active site of the enzyme is specific to substrate, which functions as a lock and key mechanism.The active site of the enzyme changes, then the substrate will not be able to bind to the active site, hindering the biological activity of the enzyme.Thus, the active site of the enzyme changes, then it will not be able to bind the substrate.
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Choose two genetic disorders and discuss how they are inherited. Plz hurry to answer this cuz i really need the answer
Down syndrome
A genetic chromosome 21 disorder causing developmental and intellectual delays.
Cystic fibrosis
An inherited life-threatening disorder that damages the lungs and digestive system.
Down syndrome and Fragile X syndrome those are the one I know
A fish feeds on algae in a pond. As a result, there is an energy transfer between trophic levels in the ecosystem. What is the name of the cellular process that releases energy from the algae so it can be used by the fish?
Answer:
Explanation:
Cellular respiration is a process through which the glucose in food is oxidised and broken into carbon dioxide and water as products. Also there is release in energy in the form of ATP.
The fish will assimilate the food by oxidizing the glucose present in algae as a result of this the food will be broken into simple components along with energy which can be used for metabolism in fish.
What type of statement would the following be considered? "I'm not a Math person because I'm not smart enough."
Growth Mindset
Fixed Mindset
Fixed mindset would be considered because of the reason that people think that their features are fixed. They consider that their qualities cannot be changed. They archive their abilities and skills. Although, they also think that their skills matter to achieve their goals. They consider that struggle does not matter.
The only necessity is talent and intelligence. Therefore the growth mindset is a false statement.
1) __________ fats or lipids form animal body fat that is used for stored energy and insulation
Brainliest answer for correct. Thanks
A neighborhood has experienced a steep increase in the amount of waste generated from individual houses. Which solutions will decrease pollution in the neighborhood?
Encourage people in the neighborhood to use more disposable products.
Burn waste in backyard fire pits.
Have neighbors dump their waste into a nearby river.
Start a recycling program.
Convert waste into reusable products.
Answer:
The correct answer is option B, Encourage people in the neighborhood to use more disposable products.
Explanation:
The best way to reduce the waste is to stop its negative impact at the source of generation. In a neighbor hood, all the house can be considered as a source of waste generation. Thus if people are encouraged to use disposable product, it would be very easy to just collect and dump the waste without segregation. This will save time, money and effort.
Answer:
Encourage people in the neighborhood to use more disposable products.
Start a recycling program.
Convert waste into reusable products.