Answer:
HERES ALL THE TEST ANSWERS
Explanation:
Physical Properties
1-What happens when a substance undergoes a physical change?
answer-Some physical properties change, but the substance keeps its identity.
2-What is an example of a physical change?
answer-ice forming and then melting back into water
3-When liquid gold becomes a solid, its particles get closer together. Which best describes what happened to the gold?
answer-the rearrangement of particles in a physical change
4-Eugene describes the physical property of a material as “sweet and floral.” What physical property of the material is Eugene most likely observing?
answer-odor
5-Which can occur during physical change?
answer-The particles can arrange in different ways.
6-If there is 8 g of a substance before a physical change, how much will there be afterwards?
answer- 8 grams
7-Which statement about the physical change of liquid water boiling into steam is true?
answer-the heat added represents an energy change
8-Fifteen grams of a liquid plastic are frozen in a physical change that increases the volume. What can be known about the plastic after the change?
answer- it will still weigh 15 grams
9-Which statement best compares and contrasts two physical properties of matter?
answer-Boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid.
10-Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid. What physical property of the material is Serena most likely observing?
answer-solubility
When a substance undergoes a physical change, its chemical composition remains the same, and there is no formation of new substances.
A physical change is a process in which the physical properties of a substance are altered, but its chemical composition remains unchanged. In other words, the substance does not undergo a chemical reaction, and no new substances are formed. Instead, the changes observed are related to the state of matter or the physical properties of the substance.
Examples of physical changes include changes in state (such as melting, freezing, boiling, or condensing), changes in shape or size (like cutting, crushing, or bending), and changes in appearance (such as dissolving, mixing, or separating). These changes are usually reversible, and the substance can often be restored to its original state by reversing the process.
One characteristic of physical changes is that they do not involve the breaking or forming of chemical bonds between atoms or molecules. The individual particles of the substance (atoms, ions, or molecules) remain the same before and after the change. For example, when ice melts into liquid water, the water molecules remain H₂O molecules throughout the process.
In contrast, chemical changes (also known as chemical reactions) involve the rearrangement of atoms and the formation of new substances with different chemical properties. In a chemical change, the original substances are consumed, and entirely new substances are produced.
Understanding the difference between physical changes and chemical changes is essential in various scientific fields, including chemistry and materials science. It helps scientists distinguish between alterations in the physical appearance of a substance and fundamental changes in its chemical nature.
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The complete question is:
What happens when a substance undergoes a physical change?
a hypothetical organ has the following functional requirements: (the ability ti resists surface abrasion and mechanical stresses; (2) the ability to contract involuntarily when stimulated by cells of the nervous system; and (3) the ability to resist tension in my different places of force. the organ needs one tissue to carry out each of these requirements , and it also needs one tissue to glue all other tissues together, and one tissue to stimulate the contracting cells. what are the five tissues that will make up this hypothetical organ? justify your choices.
Answer:
the five tissues that makes up this hypothetical organs are eipthelial, connective, muscle, and nervous tissue
Answer:
The five tissues, which could make up this hypothetical organ are smooth muscle tissue, stratified squamous epithelial tissue, loose connective tissue, dense irregular connective tissue, and nervous tissue.
The stratified squamous epithelial tissue possesses the tendency to resist mechanical stresses and abrasion. It comprises of the scale-like cells that compile together in layers and provide a barrier, which is resistant to wear and tear and abrasions.
The smooth muscle tissue possesses the tendency to contract involuntarily when instigated by the cells of the nervous system. The dense irregular connective tissue possesses the tendency to resist tension in various distinct planes of force. This is a type of connective tissue formed of collagen fibers aligned randomly.
The loose connective tissue also called areolar tissue is made up of elastin, collagen, and reticular fibers, and ample ground components are the one tissue that glues all the other tissues together. The nerve tissue refers to a unique kind of tissue accountable for communication within the body that stimulates the contracting cells.
2 Points
What is the name for different forms of a gene?
Answer:
diploid organisms
Explanation:
An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.
Why types of organism were hypothesized to be inhabiting earth prior to the rise of oxygen
Answer:
The organism Cyanobacteria was the first organism to inhabit t he Earth prior to the rise oxygen in the atmosphere.
Explanation:
The single-celled Cyanobacteria were known to be the first oxygen-producing organisms even before the rise of oxygen in the atmosphere or the "Great Oxidation Event," way back 3.5 million years ago. They were able to survive the harsh conditions of the Earth by photosynthesis. During this process, the Cyanobacteria would use sunlight, water and organic carbon dioxide to produce sugar for their energy. As a waste product, oxygen was released to the atmosphere. Accumulation of the oxygen in the atmosphere was increased by the presence of the volcanic gases like hydrogen, reacting with the oxygen. This caused a reduction reaction and made a more viable oxygen-rich atmosphere.
How can you identify is air is matter?
Answer:
Matter is anything that has mass and takes up space. Air is all around us, that is what we breath- oxygen-
Explanation:
It's easier to prove that air takes up space. As you blow into the balloon it will expand and that is a way to prove air is matter.
summarize the relationship between water, carbon dioxide, carbonic acid, bicarbonate and hydrogen
Answer:
Explanation:
Water reacts with Carbon dioxide to form Carbonic acid, please see equation below:
H2O (water) + CO2 (carbon dioxide) ⇄ H2CO3 (carbonic acid)
Carbonic acid is a weak acid and some of it dissociates to Hydrogen ions and Hydrocarbonate ions, please see equation below:
H2CO3 (carbonic acid) ⇄ H+ (hydrogen ions) + HCO3-
Carbon dioxide dissolves in water to form carbonic acid, which then ionizes to bicarbonate and hydrogen ions in a dynamic chemical equilibrium. This series of reactions plays an essential role in regulating CO₂ and pH levels in the human body and in the carbon cycle in nature.
Explanation:The relationship between water, carbon dioxide, carbonic acid, bicarbonate, and hydrogen is all linked by a series of chemical reactions. First, carbon dioxide (CO₂) from the atmosphere dissolves in water. This dissolved carbon dioxide then combines with water molecules to form carbonic acid (H₂CO3). The carbonic acid then ionizes in water to form bicarbonate (HCO3-) and hydrogen ions (H+). This process is reversible and forms a dynamic chemical equilibrium in water systems. For example, in the human body, these reactions are actively involved in the transport and regulation of CO₂ and pH levels in the blood.
Moreover, this process also occurs in nature, more than 90 percent of the carbon in the ocean is found as bicarbonate ions. These bicarbonate ions combine with seawater calcium to form calcium carbonate (CaCO3), which contributes significantly to marine organism shells and eventually forms part of the largest carbon reservoir on Earth, limestone.
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Why haven’t more regulations been put in place for agriculture in terms of water pollution?
Answer:
The rules and laws for the farmers for doing agriculture and prevent water pollution are less because the regulatory laws if followed by the farmers will make impossible for farming and trap them in a low-income and productivity of the crops.
Explanation:
Agriculture leads to water pollution due to the excessive use of chemical fertilizers and pesticides. These chemicals seeps from the soil to the water bodies thereby causing water pollution. Water pollution is harmful for the aquatic plants and animals and also affects human health.
There are rules and laws for the farmers for doing agriculture and prevent water pollution but they are less because the regulatory laws if followed by the farmers will make impossible for farming and trap of the crops.
miami Blue butterfly is an endangered species in South Florida. Which factor has
most likely caused the population decline of this butterfly?
The population decline of the Miami Blue butterfly is probably due to habitat loss, pesticide use, and climate change, similar to other butterfly species that rely on specific plants for survival.
The decline of the Miami Blue butterfly population in South Florida has likely been caused by several factors, including habitat loss due to development and construction, use of pesticides, and possibly climate change. Similar to the plight of other butterfly species like the Karner blue butterfly, which depends on the wild lupine plant for its larval development, the Miami Blue butterfly might also have specific host plants that are threatened by environmental changes. Additionally, limited availability of host plants like the butterfly weed for monarch butterflies indicates how essential specific flora is to butterfly populations.
Ecologists aim to understand the close interspecies relationships, as with the Karner blue butterfly and the wild lupine, and how factors such as wildfire suppression, which has reduced the lupine, impact the butterflies. In the case of the monarch, the focus on planting milkweeds shows the importance of preserving the plants on which butterflies rely. Examining these parallels can yield insights into the factors most likely affecting the Miami Blue butterfly.
The diagram below shows a newspaper headline.
Authorities believe they know
how prisoners escaped
What is this headline an example of?
a. a hypothesis
b. an observation
ca prediction
d. a fact
Rutherford coined the term used for the simplest positive charged particle and called it the:
Answer:
Rutherford coined the term protons and is positively charged particle present inside the nucleus of the atom. It has its own mass and is slightly less than the mass of the neutron.
Explanation:
It is believed that the protons are made up of 2 up quarks and 1 down quark. It helps to bind the nucleus together. It attracts negatively charged particle called as electron towards itself. Electrons are arranged in the orbit of the atom.
What has left tons of "space junk" in orbit around the earth? "Pick One"
A) robots sent on space missions
B) years of space exploration
C) lack of recycling
D) missiles in outer space
Answer:
B
Explanation:
How has blood transfusions been tested on animals??
Answer:
Explanation:
Key developments in blood transfusion techniques
• Animal experiments over the years 1900-1916 gradually enabled transfusion to become the routine technique it is today. The key developments were:
• George Crile (1907) perfected the technique of transfusion from artery to vein using dogs, and described its application in 32 patients.
• Hustin (1914) showed that addition of sodium citrate could prevent blood from clotting and that citrated blood could be safely transfused into dogs.
• Richard Lewisohn (1915) determined the maximum amount of citrate that could be transfused into dogs without toxicity and thus determined the optimum concentration that could be added to blood for the best anticoagulant effect.
• Weil (1915) showed that citrated blood could be stored for 2 days and still be effective when transfused into guinea-pigs and dogs which had lost blood.
• Rous and Turner (1916) used rabbits to demonstrate that, with certain additives and proper treatment, citrated blood could be stored for 14 days and still be successfully transfused.
Through these animal experiments, the prolonged storage of blood without clotting thus became possible, so enabling the establishment of blood banks, and blood transfusion as a routine procedure.
Which of the following processes make a sweat when I exercise
Digestion
Homeostasis
Reproduction
respiration
Answer:
Homeostasis
Explanation:
Homeostasis is an organism ability to maintain equilibrium [which means balancing opposing forces]. When we sweat our body it is trying to stop overheating.
Answer:
homeostasis would most likely be the answer. homeostasis is an organisms ability to maintain equilibrium (which means when opposing forces are balanced). When a human sweats, the body is trying to keep from overheating. this means the body is keeping itself at one temperature. Hope this helped
Explanation:
brainliest please-
Comprehension Questions:
1.
When a plant is placed in pure distilled water, its cells will __________.
shrink
Answer:
The plant cell is said to have become "turgid" i.e. swollen and hard.
brainliest plz :'D
Explanation:
Final answer:
When a plant is placed in pure distilled water, its cells will swell due to the hypotonic nature of distilled water resulting in turgidity, which is beneficial for maintaining plant structure.
Explanation:
When a plant is placed in pure distilled water, its cells will swell and become turgid. This is because pure distilled water is a hypotonic solution relative to the cells of the plant. In a hypotonic environment, water enters the cell due to osmosis, increasing the water volume inside the cell's central vacuole, resulting in turgor pressure which stiffens the cell walls. Unlike animal cells, plant cells are equipped with rigid cell walls that provide protection against bursting. When a plant cell is in a hypotonic solution, it will not burst but will instead become turgid, which is the ideal state for plant cells as it helps maintain the structure of the plant.
In contrast, when plant cells are placed in a hypertonic solution like sea water, they undergo plasmolysis, where water diffuses out of the cells causing them to shrink and the plant to wilt.
3. a) A plant can have either tall (7) stems or short (t) stems. Two plants are crossed. One has the
genotype Tt and the other has the genotype Tt. Fill in the Punnett square below for this cross. (1
point)
The punnett square would look like this
The punnett square is a resource that was conceived by RC Punnett, a collaborative geneticist for William Batenson (both lived between the end of the 19th century and the beginning of the 20th century, actively participating in the rediscovery of Mendel's work), which greatly facilitates the making of crosses between F-1 heterozygotes, by filling in the boxes that compose it with the genotypes resulting from the crossing performed.
The Punnet square of two organisms where one has the Tt genotype and the other the Tt genotype is shown in the image below:
Why do multicellular organisms generally live longer than un
organisms?
Answer: Multicellular organisms are larger, more efficient, and have a longer lifespan than unicellular organisms. ... The cells are specialized and must depend on each other for survival of the organism.
hope this helps :)
Explanation:
Multicellular organisms live longer due to cell complexity and organization, allowing for better adaptation and survival compared to unicellular organisms.
Multicellular organisms have specialized cells that work together to carry out functions, such as tissues, organs, and organ systems. This specialization and cooperation allow multicellular organisms to adapt to their environment and maintain internal balance, ultimately leading to a longer lifespan.
Conversely, unicellular organisms operate as individual cells and do not have the same level of complexity or organization as multicellular organisms, limiting their ability to adapt and survive in changing conditions, resulting in shorter lifespans.
At the end of meiosis, there are ____ haploid gametes.
three
four
five
Hey!
---------------------------------------------------------------
Answer:
Four
---------------------------------------------------------------
Explanation:
In egg cells, 1 haploid gamete is produced. In sperm cells, 4 haploid gametes are produced. Meiosis is the process of duplicating chromosomes to create egg and sperm cells.---------------------------------------------------------------
Hope This Helped! Good Luck!
Answer:
There are four haploid daughter cells.
Explanation:
Winds, known as trade winds, blow from east to west across the Pacific Ocean. These winds move water at the surface along the California coast Nutrients that would normally stay at the bottom of the ocean rise to the surface as well.
Which of the following conclusions is supported by the information above?
A) Trade winds help sustain some food chains.
B) Trade winds produce minerals in some oceans.
C) Trade winds can reverse parts of the water cycle.
D) Trade winds may be able to reduce global warming.
Answer:
A
Explanation:
The deep cooler currents in the oceans have more nutrients because of several factors;
They are cold and dense hence can hold much oxygenThe ‘scrap’ along the ocean floor hence carry with them dissolved mineral elements from the rocky bottom.The dead organisms that sink to the bottom of the oceans are carried by these currents.When the trade winds push the warm waters towards the east, the cooler water from the bottom upwell (from the west in a cyclic fashion) to replace the displaced water by the winds. They bring with them nutrients and oxygen that is great ‘fodder’ for plankton. The plants are then fed on by smaller fish like shrimps. The smaller fish are then preyed on by bigger fish hence sustaining food chains/webs.
2. Factors that may affect variables are called
a. experiments.
b. hypotheses.
C. theories.
d. variables.
The factors that may affect variables are called theories. The correct option is C.
What are variables?A variable is defined as any property, number, or number of items that can be counted or measured. A variable is also known as a data item.
Dependent variables are so designated in spite of the thought that their values are to be investigated in a laboratory activity.
This can be done under the presumption or requirement that they are dependent on the value of other variables due to some law or rule.
A dependent variable is one that changes as a result of the independent variable's manipulation.
It is the desired outcome, and it is dependent on your independent variable. In statistics, dependent variables are often referred to as output responses.
Thus, the correct option is C.
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Describe the way magmas are produced in subduction zones. (Help!!!!)
what would happen if the electron transport system in the light-dependent reaction of photosynthesis was disabled for some reason?
Answer: The short answer is they would have lost thir glucose.
Explanation: It is the one thing that produces glucose
Answer:
The electron transport system takes place within the cristae of the mitochondria, where the cytochromes (enzymes) and coenzymes exist. It is a series of proteins that move electrons through a membrane within mitochondria to produce a gradient of protons that activates the production of adenosine triphosphate (ATP).
The electron transport system
in the light dependent reaction of photosynthesis plays a crucial role in the creation of electrons that are employed as precursor for NADPH production.
If it was diabled, there would be no flow of electrons from PSII to PSI. Ferredoxin would be dormant since there is no electrons to pass to NADP+ which in turn will lead to no production of NADPH.
The NADPH and the respective molecules that are made in the course of the light dependent reaction are employed in the course of the dark reaction to form sugar molecules.
So, if the electron transport system in the light-dependent reaction of photosynthes is disabled, glucose molecule will not be formed in the course of the dark reaction.
identify a similarity between carbohydrates and lipids
Answer:
Carbohydrates and lipids are both macronutrients and provide several key functions to the human body.
Explanation:
These nutrients have similar chemical structures and the body uses carbohydrates and lipids in similar ways. Carbohydrates are molecules composed of carbon, hydrogen and oxygen, with a ratio of one atom of carbon and two atoms of hydrogen for every atom of oxygen. Lipids have the same elements as carbohydrates, but differ in their linkage.
what is density and what does it tell you about a substance
Answer:
Density is the characteristic property of the substance. Density is related to mass and volume of the substance.
Explanation:
Density of the substance decides whether it will float or submerge in water or any other liquid. If the substance is denser than the liquid then it will sink and if its density is lower than the liquid then it will float.
Density is written in kilogram per cubic meter. For instance, the density of oil is lesser than water and hence, it floats.
Where in the cell is the glucose produced? in mitochondria in chloroplasts in cytoplasm in water
Answer:
In chloroplasts
Explanation:
It is produces in the chloroplasts of the cell. Glucose is a simple sugar and photosynthesis produces the glucose and then glucose is transported into the cells. Chloroplasts are making sugar during the process of converting light energy into chemical energy and those are stored in glucose.
Chloroplasts are the food producers and we can find them in plant cells and eukaryotic algae.
Josey wants to look at the cells of an onion under a light microscope. She peels off a thin, transparent layer of onion and places it on a microscope slide. Josey places the sample on the microscope stage, looks through the eyepiece, and adjusts the stage to focus the image. However, she is unable to see any details of the cells.
Which of the following possible solutions could possibly help Josey to see the onion cells in detail?
A. Josey should use a thicker piece of onion for her sample.
B. Josey should place her onion sample in a vacuum.
C. Josey should place a drop of water on her sample.
D. Josey should apply a stain, such as iodine, to her sample.
Answer:
D
Explanation:
Staining allows for visualization of cells and its organelles under a microscope because cells in their natural form are either transparent or translucent. There are different staining techniques depending on the type of microscope being used, the type of cell being visualized, identification of cells, and etcetera. In this case iodine is used because it is well taken by starch molecule in the onion cells hence increasing visualization of the cell.
The possible solution that Josey can employ that will make her see the details of the onion cell under a microscope is: D. Josey can apply a stain to her sample, such as iodine.
Most cells and cell structures appear translucent if you try viewing them with a microscope in their natural form. They are not transparent.
To make these cells and their organelles transparent when viewing under a microscope, different staining techniques are usually employed, depending on the type of cells and the microscope being used.
Onion cells can be made transparent under a microscope if it is stained with iodine.
Therefore, the possible solution that Josey can employ that will make her see the details of the onion cell under a microscope is: D. Josey can apply a stain to her sample, such as iodine.
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Which describes the correct pairing of DNA bases?
O
A. C with G, and A with T
O
B. C with C, and G with G
O
c. C with A, and G with T
O
D. C with T, and G with A
SNE
Answer:
A
Explanation:
The base C always pairs with G, and A pairs with T or sometimes U,
C - G
A - T
The correct pairing of DNA bases, based on Chargaff's rules, is C with G, and A with T. This is due to the structure of these molecules and the number of hydrogen bonds they can form.
Explanation:In the universe of biology, the DNA bases are paired in a standard and specific manner which is essential to the proper functioning of DNA replication and the transcription of genes. These pairing rules are defined by scientist Erwin Chargaff's rule, also known as Chargaff's rules.
According to these rules, Cytosine (C) always pairs with Guanine (G), and Adenine (A) pairs with Thymine (T). Hence, the correct option among those provided would be A. C with G, and A with T.
This specific pairing is due to the structure of the molecules and the number of hydrogen bonds they can form: C and G form three hydrogen bonds between them whereas A and T form two hydrogen bonds. Any other pairing won't hold the DNA strands together sufficiently.
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Explain how the alleles were passed from
parents to offspring.
Answer:
Explanation:
The offspring received one allele from each parent. The alleles were separated during gamete formation before they were passed to the offspring. Green pod color is dominant, resulting in the offspring having the green pod color.
Answer:
The offspring received one allele from each parent. The alleles were separated during gamete formation before they were passed to the offspring. Green pod color is dominant, resulting in the offspring having the green pod color.
Explanation:
This was the sample answer on e2020
Select the numeral form of this number written in scientific notation.
5 × 103
0.005
500
5,000
5,000,000
Answer:
5,000
Explanation:
theirs 5 x 10^3
the 10^3 means 3 -zeros and the 5 would stay the same, so if you have the 5 in the front and the 3 zeros in the back it would be 5,000
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What role do the bones of the skeletal system play in breathing?
Answer:
The bone position the nose so that it always stand upright.
Explanation:
The nose has skeletal bone inside that always holds the flesh of the nose to always ensure the nose is open to receive air.
how do you think living systems, such as sea stars, carry out life functions and respond to changes in their environment
Answer:
Sea stars carry out life functions in diverse -and unique- ways (read below) and are able to respond to environmental changes through adaptations such as temperature regulation.
Explanation:
Sea stars are invertebrate organisms that belong to the Phylum Echinodermata and are adapted to life in the ocean. They carry out life functions in diverse kind of ways. Here are some examples:
Limb regeneration: they are known for the impressive ability to regenerate their limbs, which they accomplish because almost all of their vital organs are located in the arms.Feeding: sea stars are generally carnivorous creatures. They use their suction-cupped feet to open clams, mussels, and oysters. On the other hand, there are some species that prefer to feed on detritus or organic matter.Locomotion: these organisms are able to move thanks to their water vascular system, as they do not possess a circulatory system. Water circulates throughout their body into their feet, allowing it to extend and move.Response to environmental changes:
According to new research evidence, these marine creatures possess unique adaptations that are extremely helpful in regard to environmental changes. They are able to regulate their own temperature during changing tides. During high tides, sea stars absorb cold water that is later used when temperatures are too hot due to warm water and sunlight. This adaptation is crucial to respond to environmental changes such as climate change.
Freshwater protozoans must be able to maintain homeostasis within their environment. One of the problems they face is water diffusing into their cells from the environment. How do they address this issue?
A) Freshwater protozoans respond to the hypotonic environment by removing water through a pseudopod.
B) Freshwater protozoans respond to the hypertonic environment by removing water through a pseudopod.
C) Freshwater protozoans respond to the hypertonic environment by removing water through a contractile vacuole.
D) Freshwater protozoans respond to the hypotonic environment by removing water through a contractile vacuole.
Answer:
The correct option is D. Freshwater protozoans respond to the hypotonic environment by removing water through a contractile vacuole.
Explanation:
A hypotonic environment can be described as a condition in which the concentration of water is more outside the cell than the inside of a cell. In such a condition, water tends to enter the cell through osmosis. This can cause the cell to be filled excessively with water and burst.
To avoid such circumstances, the freshwater protozoans contain contractile vacuoles. The contractile vacuoles remove excess water from the cell.
answer: is d
Explanation: