Answer:
Both physical and chemical properties play a crucial role in identifying unknown matter. Here's how they work together:
Physical Properties:
Easy to Observe: These properties can be observed without changing the matter's composition. Examples include color, texture, density, melting point, boiling point, and electrical conductivity.
Initial Screening: By observing physical properties, you can narrow down the possibilities. For instance, a shiny, yellow metal with a high melting point suggests gold, while a white, powdery substance with a low melting point could be sugar.
Chemical Properties:
Deeper Identification: Chemical properties describe how a substance reacts with other materials. Observing these requires a controlled experiment that changes the substance's composition. Examples include flammability, reactivity with acids, and the production of specific gases during a reaction.
Confirmation: By testing a substance's reactivity, you can confirm your initial suspicions based on physical properties. If the unknown metal reacts with sulfur to form a black sulfide, it strengthens the possibility of it being silver.
Together is Better:
Combined Approach: Using both physical and chemical properties provides a more robust identification process. For instance, if an unknown liquid is colorless, boils around 100°C, and extinguishes a flame, these combined properties strongly suggest it's water.
In conclusion, physical properties offer a starting point for identification, while chemical properties provide a more definitive confirmation. By considering both, scientists can effectively identify unknown substances.
Explanation:
Physical properties describe appearance and behavior, while chemical properties detail how substances react, aiding in matter identification.
Identifying matter involves observing and understanding its physical and chemical properties. Here's how these properties aid in identification:
Step 1: Observation:
Begin by observing the characteristics of the substance. Physical properties are those that can be observed or measured without changing the substance's chemical composition. Examples include color, density, melting point, boiling point, odor, and conductivity.
Step 2: Physical Properties:
Physical properties provide clues about the substance's composition and behavior under various conditions. For instance, the color and appearance of a substance can help differentiate it from others. The density helps determine its mass per unit volume, while the melting and boiling points indicate its thermal stability.
Step 3: Chemical Properties:
Chemical properties describe how a substance interacts with other substances and undergoes chemical changes. These properties include reactivity, combustibility, acidity, and the ability to undergo specific reactions. For example, if a substance reacts with acid to produce gas, it indicates a specific chemical property.
Step 4: Comparison and Analysis:
By comparing the observed physical and chemical properties of an unknown substance with known properties of various materials, scientists can narrow down the possibilities and identify the substance. This process involves using databases, reference materials, and experimental data to match the observed properties.
Step 5: Verification:
Once a potential identification is made based on observed properties, further testing and analysis may be conducted to confirm the identification. This may involve performing additional chemical reactions, spectroscopic analysis, or other specialized tests to validate the initial assessment.
Step 6: Conclusion:
Based on the comprehensive analysis of physical and chemical properties, a conclusive identification of the matter can be made. This identification aids in understanding its properties, behavior, and potential uses in various applications.
How are bacterial and fossil species defined
Answer:
fossil species- must be old relative to the time of origin of the extant clade.
Single-celled microorganisms that can exist either as independent (free-living) organisms or as parasites (dependent on another organism for life). The plural of bacterium
Answer:
Bacterial: a microscopic, single-celled organisms that thrive in diverse environments.
fossil Species: the fossil species must be old relative to the time of origin of the extant clade (common ancestor).
Explanation:
Which numbers identify the organelles that are present in BOTH plant and animal cells? A) 1, 2, 3, 4, 5 B) 1, 4, 5 C) 1, 5 D) 1, 2, 5
Answer:
C is the anssert
A geologist finds a metamorphic rock and notices that it has grains that formed in parallel layers. The geologist pries at the
rock, and it splits apart along the bands formed by the layers.
Which type of rock did the geologist most likely find?
gneiss
limestone
marble
sandstone
Answer: a) gneiss
Explanation: because edge told me
How does acid rain effects the plants and animals of an ecosystem?
Answer:
acid rains that land directly on tress and crops can harm them. which results in more aluminum absorption from soil, which is carried into lakes and streams which can kill the animals in the water
Answer:
Explanation:
Acid rain has many ecological effects, especially on lakes, streams, wetlands, and other aquatic environments. Acid rain makes such waters more acidic, which results in more aluminum absorption from soil, which is carried into lakes and streams. ... Trees' leaves and needles are also harmed by acids.Scientists know that acidic water dissolves the nutrients and helpful minerals in the soil and then washes them away before trees and other plants can use them to grow. At the same time, acid rain causes the release of substances that are toxic to trees and plants, such as aluminum, into the soil.
Will give brainlest and alot of points
Anwser all the questions
Are there any faults on your geologic map? if so, what types
What types of rock are found in the area?
Are there any special landforms on your map? if so what types?
Which type of rock has the thickest deposits? the thinnest
Briefly describe any other features on your map?
the picture is pretty bad quality, but it looks like there are thrust faults.
a lot of limestone as well as some sandstone, conglomerate, quartize, chert, siltstone, clay, silt, sand, gravel, and mudstone.
there's a canyon in the south
pink limestone has the thickest deposits, and alluvium seems to have the thinnest.
the alluvium seems to appear in branch- or river-shaped formations, and the wahweap, colluvium, and sevier river formations are all in the north.
that's the best i could do with this information, really hope this helps!!
Which is an example of a fractional scale?
Answer:
Fractional or Ratio Scale: Afractional scale map shows the fraction of an object or land feature on the map. This type uses a set of numbers that represents the object or a landmark. As an example on the left photo, the orange-shadedscale represents a 2/3 fractional scale. 2.
Electromagnetic waves are examples of ____ waves. A. Longitudinal waves B sound waves C. Surface waves D. Transverse waves
Answer:
D. Transverse waves
Explanation:
Ocean waves are also transverse, and these are used for many recreational activities such as surfing and swimming. They can also be used to generate renewable electricity from the wave motion.
--Hops
Two structures play an important role in the way that birds digest food.
is a muscular structure that grinds food into small pieces.
temporarily stores food before it enters the stomach.
Answer:
Gizzard and crop
Explanation:
I just answered that question.
Please help
Gravity in Space? Olivia asked her friends what they know about gravity in space. this is what they said:
Justin: There is no gravity in space.
Taylor: Gravity only exists on planets.
Juanita: Gravity is a force that exists between all objects that have mass even in space!
Which friend do you agree with the most? Explain why you agree.
Answer: Juanita - Gravity is a force that exists between all objects that have mass even in space!
Explanation:
It sounds like the question is asking for your opinion and explanation on what you know about gravity.
To help you out a little bit, here’s some examples of gravity:
Gravity is the force in which pulls objects together. The force of gravity keeps all of the planets in orbit around the sun. Anything that has mass also has gravity. Objects with more mass have more gravity.
Hope this helps :)
PLEASE HELP
Which phrase best defines radiant energy?
A. mechanical waves that require a medium to travel through
B. particles that move perpendicularly in the medium
C. energy transmitted by an electromagnetic wave
D. energy transferred from the earth to the sun
Answer:
C. energy transmitted by an electromagnetic wave
Explanation:
Radiant energy is defines as the energy of gravitational and electromagnetic radiation.
The energy is transmitted by electromagnetic waves in a synchronized oscillations of magnetic fields and electric field. Different types of electromagnetic waves have different wavelengths, frequencies, and power and all interact with matter differently. Different types of radiant energy include micro waves, visible light,radio waves, infrared radiation, X-rays, ultraviolet radiation and gamma rays.
Radiant energy can travel through space and do not require any medium. Example of radiant energy is heat recieved from the sun by the earth travelled through a vacuum by electromagnetic waves.
Hence, the correct option is C.
O Football players are 33% more likely to get injured than baseball players.
O Baseball is a fun sport.
Football is more dangerous than baseball.
Answer:
o Football players are 33 percent more likely to get injure than baseball
Explanation:
hope i gave the answer
1. what is the optimal pH for pepsin ?
2. What is the optimal pH for lipase?
3. Do you think lipase is an enzyme that is found in the stomach ?
The optimal pH for pepsin is 1.5 and lipase has an optimal pH around 7-8. Lipase is not typically found in the stomach.
Explanation:The optimal pH for pepsin, the main digestive enzyme in the stomach, is 1.5. Pepsin works best in the acidic environment (low pH) of the stomach, where it helps break down proteins into smaller molecules.
On the other hand, lipase is an enzyme that primarily functions in the small intestine. The optimal pH for lipase is around 7-8, which is considered neutral to slightly alkaline.
No, lipase is not typically found in the stomach. It is primarily produced and secreted by the pancreas, and its main role is to break down fats (lipids) into smaller components that can be easily absorbed and utilized by the body.
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Pepsin's optimal pH is 2.0 for protein digestion in the stomach. Lipase's optimal pH is 8.0, active in the small intestine.
The optimal pH for enzymes can vary significantly, and it's important for their activity in different parts of the body:
1. Pepsin is an enzyme that works in the stomach, and its optimal pH is approximately 2.0. This highly acidic environment is conducive to the enzyme's activity in breaking down proteins.
2. Lipase, on the other hand, has an optimal pH of around 8.0, which is more alkaline. This enzyme is not typically found in the stomach. Instead, lipase primarily functions in the pancreas and the small intestine, where it aids in the digestion of fats.
3. Given that the stomach is a highly acidic environment, lipase would not be as active there due to its preference for a more neutral to alkaline pH. Therefore, it's not considered a major enzyme of the stomach. The primary lipase for digestion, pancreatic lipase, operates in the small intestine where the conditions are more suitable for its activity.
Enzymes like pepsin and lipase are crucial for digestion, each working best under specific pH conditions that match their location in the digestive system.
Which statement best describes the climate of a city?
Select one:
The average annual temperature of Austin, TX is 68.5°E
San Antonio, Texas had a high temperature of 102°F today.
Dallas, Texas had 8.6 centimeters of rain today.
The temperature in El Paso, Texas today at dawn was 57°F.
The primary difference natural and artificial selection is:
Question 12 options:
In natural selection, the selection "pressure” comes from the environment; in artificial selection the “pressure” comes from humans.
In artificial selection, the selection “pressure” comes from the environment; in natural selection the “pressure” comes from humans.
Natural selection is when humans breed the animal; artificial selection is when humans edit genes directly.
Answer:
it is "In natural selection, the selection "pressure” comes from the environment; in artificial selection the “pressure” comes from humans."
Explanation:
We know that natural selection is when the weakest basically get sick and killed, and the strongest stay. here is the definition of natural selection: "the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution."
we also know that artificial selection (selective breeding) is when humans take, for example, the juiciest, reddest tomatoes, and breed those to create juicy red tomatoes. the exact definition of artificial selection is: "Selective breeding/artificial selection is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotypic traits by choosing which typically animal or plant males and females will sexually reproduce and have offspring together."
so based on the explanation, we know that natural selection is because of the organisms' environment and that artificial selection is because of humans. I hope this helped you! :]
Final answer:
The primary difference between natural and artificial selection lies in the source of the selection pressure: environmental conditions drive natural selection, while human preferences and interventions guide artificial selection.
Explanation:
The primary difference between natural and artificial selection is where the selection "pressure" comes from. In natural selection, environmental factors such as predators, availability of food, or climate conditions act as the selection pressure, favoring individuals with traits that enhance their survival and reproductive success. Conversely, in artificial selection, humans actively choose which individuals of a species to breed based on desired traits, leading to populations that are more aligned with human preferences over time. Thus, the key distinction lies in natural selection being driven by environmental challenges and survival of the fittest, while artificial selection is guided by human desires and intervention to cultivate certain traits.
The type of population growth that most natural populations follow is
Answer:
The type of population growth that most natural populations follow is Exponential growth.
hope it helps!
Natural populations often follow logistic growth, which includes an initial rapid growth phase followed by a slowdown as carrying capacity is approached. The growth pattern forms an S-shaped curve, commonly seen in species such as the snowshoe hare.
Explanation:Most natural populations follow logistic growth. Unlike exponential growth that continues indefinitely, logistic growth takes into account environmental resources and carries capacity. In a logistic growth model, the population increases rapidly at first, but as it nears its carrying capacity - the maximum population size that an environment can support - the rate of growth slows down and eventually stabilizes.
A classic example of a species that follows logistic growth is the snowshoe hare. Initially, the population will grow rapidly, until resources such as food start to become scarce. As a result, the population's growth rate will slow down and eventually stabilize, demonstrating an S-shaped curve indicative of logistic growth.
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As time goes by and water goes through the water cycle again and again, the amount
of water on Earth:
increases
decreases
stays the same
The amount of water on Earth stay the same.
Water is a substance essential to life and includes rain, groundwater, lakes, ocean etc.
The Water cycle is a cycle which describes the overall movement of water from above the earth to the below the surface of the Earth.Water cycle includes four steps:
Evaporation/Transpiration: The is when water goes into air because of the heat caused by sunCondensation: This is when water vapor caused by sun forms the cloud. Precipitation: This is when the cloud is too heavy for the air to carry and then falls back to the earth. Storage/Collection: This is when the water which falls back is stored or collected such as lakes, groundwater, rivers etcIn conclusion, the cycle of water moves from the fourth step to the first step and continues like that infinitely, thus, the amount of water on Earth stay the same
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What is not a part of heredity?
A. traits
B. nutrients
C. chromosomes
D. phenotype
Answer:
B. nutrients
Explanation:
Heredity refers to the passing down of traits throughout generations. Chromosomes, traits, and phenotype are all related to traits. Nutrients are not.
Answer: Nutrients
Explanation: Nutrients we get from food, there for it is not apart of our DNA/ Hereditary features.
As the Earth rotates on its axis and revolves around the Sun, the Earth goes through seasonal changes. Why does this happen?
A. because the Moon revolves around the Earth
B. because the Earth's axis is tilted
C. because the Earth rotates slowly
D. because the Earth is closer to the Sun during the summer
Answer: The answer is B: Because the earth's axis is tilted.
Explanation:
Instead, Earth has seasons because our planet's axis of rotation is tilted at an angle of 23.5 degrees. The tilt in the axis of the Earth is called its obliquity.
As the Earth rotates on its axis and revolves around the Sun, the Earth goes through seasonal changes. Because the Earth's axis is tilted.
What is Earth's axis?The Earth's axis is inclined 23.4 degrees, or almost halfway between its extremes, and this angle is steadily getting smaller throughout the course of a cycle that lasts roughly 41,000 years.
It was last tilted to its highest position approximately 10,700 years ago, and it will tilt to its lowest position in roughly 9,800 years. As obliquity gets less, it gradually helps to milden our seasons, producing warmer winters and cooler summers that eventually allow snow and ice to accumulate into massive ice sheets at high latitudes.
As the amount of ice cover grows, more of the Sun's radiation is reflected back into space, causing a further cooling.
Therefore, As the Earth rotates on its axis and revolves around the Sun, the Earth goes through seasonal changes. Because the Earth's axis is tilted.
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In vertebrates such as a chicken, a mouse, of a python, variation in the number of vertebrae in the spine is determined by Hox genes. Which MOST LIKELY way that Hox genes account for this variations?
A) As Vertebrates evolved, mutations in Hox genes led to new vertebral organization during embryological development
B) As vertebrates evolved, mutations in Hox genes directly resulted in new proteins that determined vertebrae
C)Long before vertebrates evolved, a wide variety of Hox genes developed and many codes for vertebral structures
D) Environmental factors, which differ among vertebrate groups, activate specific Hox genes that code for specific structures
Answer:
I think the answer is C.
Explanation:
C.
Answer:
A. As Vertebrates evolved, mutations in Hox genes led to new vertebral organization during embryological development
Explanation:
The water in the bottom of this bottle best represents -
rainfall
condensation
rivers
accumulation
Answer:
Option A, accumulation
Explanation:
As we can see in the image, the water gets heated and convert its pahse from liquid to gas i.e from liquid water to water vapor. As it rises above, it condenses and converts from water vapor into liquid water. The liquid water then moves in the downward direction and collects at the base. This process of collection at base can be related to accumulation of running water.
Option A is correct
Genetically engineered bacteria are being developed to produce alternative fuels.
Please select the best answer from the choices provided
True or false
Answer:
True
Explanation:
Yes this is true due to advancements in genetic engineering.
A bacterium was transformed by scientists into a plant with the main purpose of the production of biofuel. The microorganism was expelled of its fatty acid but this synthetic route of extraction and purification is however very expensive.
The production of this fuel has several problems such as insufficient rates to meet the production rates of demand for biofuel while being competitive with oil and other forms of biofuel.
1. Volcanoes are openings in Earth's crust where lava, gas, and ash can erupt. Where are
active volcanoes located?
Answer:
Active volcanoes are on plate boundaries (where tectonic plates meet)
Explanation:
Answer:d. d.
Explanation:
A volcano is an opening in the earth's crust
Please Help 20 points
Describe three examples of positive feedback and three of negative feedback, in other systems that have many interacting parts – such as economic, social, political systems.
Answer:
i didn't no
Explanation:
i didn't understand your question
Final answer:
Positive feedback and negative feedback are mechanisms that regulate various systems. Examples of positive feedback include the spread of rumors and the escalation of conflicts. Examples of negative feedback include the adjustment of interest rates to control inflation and the automatic stabilization of the economy through government spending.
Explanation:
Positive feedback and negative feedback are mechanisms that regulate various systems. Examples of positive feedback in social systems include the spread of rumors and the escalation of conflicts. Examples of negative feedback in economic systems include the adjustment of interest rates to control inflation and the automatic stabilization of the economy through government spending.
Water includes...
A. Temperature, pH, salinity, precipitation, and humidity
B. Humidity, pH, perception, wind , and pressure
C. Salinity, temperature, pressure, humidity, and wind
D. Temperature, pressure, precipitation, humidity, wind
Answer:
A, Temperature, pH, salinity, precipitation and humidity
Explanation:
Water includes all of these options. Also, water doesn't include wind which is in all three of the other options, so this is the only option that would work. Hope this helps :)
Frequency of Earthquakes with Different Magnitudes
Magnitude Range Frequency of Occurrence
3.0 - 3.9 49,000 per year
4.0 - 4.9 6,200 per year
5.0 - 5.9 800 per year
6.0 - 6.9 120 per year
7.0 - 7.9 18 per year
8.0 - 8.9 1 per year
There are over 56,000 earthquakes recorded yearly on Earth. Many occur on the ocean floor while others are so small that they can only be detected using special equipment. A small percentage of earthquakes can lead to massive destruction on Earth, including loss of life and property.
Which of these earthquakes would most likely lead to the most damage to human lives?
A) a 7.2 earthquake in Los Angeles
B) a 8.5 earthquake in the rain forest
C) a 6.0 on the coast of Alaska
D) a 3.6 earthquake in downtown Chicago
PLEASE BE RIGHT
Answer: A) A 7.2 earthquake in Los Angeles
Explanation:
According to the Article, why is the Wallace's giant bee in danger of losing its home?
A
Because the rare bee can be sold online for thousands of dollars
Because the bee has been making its nests inside termite nests
Because Wallace's giant bee hunters are now traveling to Indonesia
D
Because Indonesia has lost nearly 15 percent of its trees since 2001
Answer:
D
Because Indonesia has lost nearly 15 percent of its trees since 2001
Explanation:
The Wallace is known to be the largest bee in the world. It is also known to have its nests high up on trees and they are commonly in Indonesia.
The bees however are facing threats of extinction due to deforestation and urbanization. Indonesia is known to have lost nearly 15 percent of its trees since 2001 which is the bees habitat.
Type your response in the box.
An invasive species is a non-native species that lives in a region. Human activity has accidentally or intentionally
introduced many invasive species into ecosystems. Name two human activities that could contribute to the
introduction of invasive species. Explain your response.
Answer:
Explanation:
Many non-native plants are introduced through people dumping their aquariums into bodies of water
People who release non-native animals from captivity (Fish are a big one)
people who bring soil on their boots back from traveling to a different country my introduce non-native bacteria cultures
Answer:
Human travel can lead to an increased risk of invasive species. Native species—both animals and plants—can stow away on cars, trains, boats, and airplanes that bring them to another ecosystem. Climate change also can play a role. Human activity causes increased levels of carbon dioxide and other greenhouse gases in the atmosphere, which in turn creates an increase in global temperatures. Because all species are adapted to a specific climate, climate changes can result in non-native species spreading into other ecosystems.
Explanation:
i am doing the same lesson too:)
David and Luisa are trying to determine if two samples are the same or different substances. First, they observed sample 1 and sample 2. Then, they wrote down their observations. Review their observations. Then, answer the questions below.
Which student’s observations would prove more useful to a chemist?
David's observations
Luisa's observations
Explain your answer below.
Answer:
Luisa's Observation.
Explanation:
Luisa's observation is explained better than David's was, and judging by the observations, David studied the same material, while Luisa's observation contained different description, meaning that there was likely more than one substance being observed and studied.
David researched the same material, according to the observations, but Luisa's observation is better explained than David's, and since Luisa's observation had different description, it is possible that more than one item was being viewed and studied.
What is observed sample?All occurrences of a random variable are referred to as observations of that variable in statistics. The actual collection of data points is also referred to as a sample of a particular population of observations.
Any value calculated from your sample data is referred to as a sample statistic (or simply a statistic). The sample average, median, sample standard deviation, and percentiles are a few examples.
Because a statistic is based on data gathered through random sampling, which is a random experiment, it is a random variable.
Therefore, Luisa's observations would prove more useful to a chemist.
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A scientist observes a cell under a microscope and notices that the cell’s cytoplasm is almost completely full of rough endoplasmic reticulum. What would you hypothesize these cells are making in large amounts? Explain your answer in your own words and in full, complete sentences.
Answer:
I hypothesize that the cells are producing many proteins. This is because rough endoplasmic reticulum has ribosomes on the surface and ribsomes function is to make proteins.
Explanation:
Yoo can someone help pleaseee
Answer:
Number 3.
Explanation:
Cold water is denser than warm water. Hot water is less dense and will float on room-temperature water. Cold water is more dense and will sink in room-temperature water.
Answer: Warm water is denser than cold water.
Explanation: Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density. Hot water is less dense and will float on room-temperature water. Cold water is more dense and will sink in room-temperature water.