Answer: Evaporation of salt water
Explanation: During the process of evaporating salt water which involves simple distillation, pure water is separated with salt molecules.
When heated water evaporates from the solution since it is less dense. When condensed it becomes pure water and salt is left out since it is more denser.
Which substance would most likely need to cool to the lowest temperature before it condenses?
Answer:
A
Explanation:
Which of the following could cause a habitat change?
a introduction of an invasive species
b. a wildfire
a mudslide
d. all of the above
Please select the best answer from the choices provided
A habitat change can be caused by introduction of an invasive species, wildlife and mudslides. Therefore, option (d) is correct.
What is habitat change?Habitat change can take place naturally through disease, droughts, fire, hurricanes, mudslides, volcanoes, earthquakes, or precipitation, etc.
However, it is commonly induced by human activities like land use change and physical modification of rivers.
Habitats can change over time due to natural and manmade effects. Natural influences involve seasonal changes, drought, flooding, and natural succession. Manmade effects include conversion of land from forests to farms, and pollution.
Habitat destruction through natural processes like volcanism, wildfire, and climate change. Habitat fragmentation of tropical rainforests led to a great loss of amphibian diversity, but at same time the drier climate spurred on a burst of diversity among reptiles.
An invasive species are an introduced organism that gets overpopulated and harms new environment.
Therefore, mudslides, wildlife and invasive species can cause habitat change.
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10. In what biome would you most likely find
A? How is this animal adapted to survive
in its biome?
Answer:
Is there supposed to be options I don't understand the question
Assume that the batteries in a flashlight are rechargeable. What energy conversion would have to take place in order to recharge the batteries?
Electrical to chemical energy
Explanation:
If the batteries in a flashlight are rechargeable, the energy conversion that would take place to recharge the battery is from electrical to chemical energy.
A battery is an electrochemical cell in which chemical reactions produces electrical currents. This is a typical energy conversion from chemical to electrical energy. When such batteries are to be recharged, the revere process is followed. Electrical energy are used to drive chemical reactions. This in turn makes the battery recharged and on its own, it can further chemical reactions to produce electrical energy. During charging, the potential of the battery increases.learn more:
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Final answer:
To recharge flashlight batteries, electrical energy from a power source is converted into chemical energy within the batteries, which can later be reconverted into electrical energy to provide power.
Explanation:
To recharge the batteries in a flashlight, the necessary energy conversion involves transforming electrical energy into chemical energy. This is achieved by applying an electric current to the batteries using a charger. The electric current reverses the chemical reactions that took place in the battery during discharge. When the batteries are being used after charging, this stored chemical energy is then converted back into electrical energy to power the flashlight. The processes involved are quite efficient, boasting an efficiency of around 90 percent for each step. Thus, the overall efficiency from electrical to chemical to electrical energy and eventually to mechanical energy (in the case of an electric motor) is over 75 percent.
Select the ion.
-NO 2
-H2SO4
-AI +3
Answer:
Al+3
Explanation:
Ion is a positively or negatively charged species. A neutral species does not carry any charge.
here only Al has +3 charge. So it is an ion.
Everyone in Mrs. Blaylock's science class must perform an experiment for the science fair this year. To begin this process, Mrs. Blaylock asks her students to brainstorm four different questions that they could study.
One of Mrs. Blaylock's students writes down the following questions.
How does the mass of a toy car affect its speed down a ramp?
How does the position of the Sun, moons, planets and stars affect a person's personality traits and daily behavior patterns?
Which type of pan - copper, aluminum, or glass - heats up the quickest?
Which type of chemicals can remove the cell wall of a plant cell?
Which of the above questions cannot be answered through a scientific investigation?
Answer:
Second choice: How does the position of the Sun, moons, planets and stars affect a person's personality traits and daily behavior patterns?Explanation:
Science or scientific investigations deal with objective phenomena; this is phenomena which can be described by using objective measurements.
The effect of the position of the Sun, moons, planets and stars on a person's personality and daily behavior patterns is not a scientific question because none scientific field deals with that kind of questions.
Only, a pseudoscience, this is a set of beliefs that have not been scientifically proved, may deal with a question about the effect of the position of some heavenly objects can affect a person's personality traits and daily behavior of patterns.
On the other hand, the aspects deal with in the other questions (the mass of a toy car, the speed down a ramp, the heating from different type of pans, how different type of chemicals remove the cell wall of a plant cell) are measurable and testable (falsifiable), which make them objects of science (like physics, chemistry, and biology)
Answer:
Question 2
Explanation:
Study Island
Question 1 of 10
5 Points
Abram took his physics test and didn't do very well. His teacher thinks this is
because he is a senior and didn't want to work hard. The teacher may be
overestimating the:
A. representativeness heuristic.
O
B. dispositional attribution.
O
C. informational influence.
D. situational attribution.
Answer: b// dispositional attribution
Explanation:
Answer:
B. Dispositional Attribution
Explanation:
Dispositional Attribution means citing a person's qualities as the reasons for his or her actions or experiences.
What did Lisa do wrong in regards to lab safety?
Answer:she did not do it in the correct order
Explanation:
Lisa violated several lab safety rules. Here are the specific safety protocols that Lisa failed to follow:
1. Wearing a lab coat: Lisa was not wearing a lab coat, which is essential personal protective equipment (PPE) in a laboratory setting. Lab coats protect the skin and clothing from spills and splashes of hazardous substances.
2. Wearing gloves: Lisa did not have gloves on when handling the chemical. Gloves are necessary to prevent skin contact with chemicals, which could cause irritation, burns, or be absorbed through the skin.
3. Wearing safety goggles: Lisa was not wearing safety goggles. Eye protection is crucial to prevent injury from chemical splashes, vapors, or flying objects.
4. Proper disposal of broken glassware: Lisa placed the broken glassware in the regular trash bin. Broken glassware should be disposed of in a designated sharps container to prevent injury to others who may come into contact with the trash.
5. Proper storage of chemicals: Lisa returned the bottle of acetone to the wrong shelf. Chemicals should always be stored in their correct, designated locations to prevent incompatibility reactions (e.g., mixing of acids and bases, oxidizers and flammables) that could lead to fires, explosions, or the release of toxic fumes.
6. Leaving the fume hood open: Lisa left the sash of the fume hood open. The sash should be closed to the proper working level to contain and exhaust fumes and vapors from the laboratory.
7. Using a spatula to transfer chemicals: Lisa used a metal spatula to transfer a solid chemical. Depending on the reactivity of the chemical, a metal spatula could introduce contamination or react with the chemical. It is important to use the appropriate tool for the task, often a plastic or ceramic spatula for corrosive substances.
8. Ignoring the chemical's label: Lisa did not read the label on the chemical bottle before use. It is essential to read and understand the labels and safety data sheets (SDS) for all chemicals to be aware of their properties, hazards, and handling procedures.
9. Not using a pipette bulb or pipette filler: Lisa used her mouth to pipette the solution, which is extremely dangerous. Using the mouth to pipette can lead to ingestion or inhalation of hazardous chemicals. Instead, a pipette bulb or a mechanical pipette filler should be used.
10. Not securing her hair: Lisa's hair was not tied back or covered, which can be a hazard near open flames or when working with volatile chemicals. Hair should be secured to prevent it from catching fire or coming into contact with hazardous materials.
In summary, Lisa's actions in the lab were not in compliance with standard laboratory safety practices, which are designed to protect her and others from potential harm. It is critical for anyone working in a laboratory to adhere strictly to safety guidelines to minimize the risk of accidents and exposure to hazardous materials."
what is the scientific definition of heat
Answer:
Most of us use the word 'heat' to mean something that feels warm, but science defines heat as the flow of energy from a warm object to a cooler object.
Explanation:
Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases.
At a molecular level, heat is the transfer of energy that makes use of or stimulates disorderly molecular motion in the surroundings.
Heat, is defined as the transfer of thermal energy until equilibrium is reached, measured in joules. It is distinct from temperature, which measures average kinetic energy per molecule and does not involve energy transfer.
The scientific definition of heat is the amount of thermal energy that is transferred between systems or objects with differing temperatures. This transfer of thermal energy occurs until thermal equilibrium is reached, meaning no net flow of thermal energy between the systems.
Unlike temperature, which is measured in degrees, heat is quantified in joules (J), a unit that measures energy. The concept of heat is central to the field of thermodynamics, which studies the relationships between heat, work, and energy. An everyday example of heat transfer is when you drink hot coffee; the heat from the coffee transfers to your mouth, causing it to warm up.
How many molecules is 0.360 mole of water?
Answer: 2.17 x 10^23 molecules
Explanation:
1mole of H2O contains 6.02x10^23 molecules.
Therefore 0.360mole of H2O will contain = 0.36 x 6.02x10^23 = 2.17 x 10^23 molecules
There are approximately 2.16792 × 10^{23} water molecules in 0.360 mole of water, calculated by multiplying the moles by Avogadro's number.
we need to use Avogadro's number, which is 6.022 × 10^{23} molecules per mole. We multiply the number of moles by Avogadro's number to find the total number of molecules.
Calculation:
Multiply the number of moles (0.360) by Avogadro's number.0.360 mole ×6.022 ×10^{23} molecules/mole = 2.16792 × 10^{23} molecules.Therefore, 0.360 mole of water contains approximately 2.16792× 10^{23} water molecules.
4. How many moles of silver are in a ring that contains 3.50 grams of silver?
Answer:
3.5g/{molar mass of silver}
3.5g/(107.86g/mol)
now we have 0.03244mol of silver
The statement of the moles of silver is "0.0324 mol."
What is mole?The mole is a SI unit of measurement that is used to determine the amount of any substance that need to be given in mol. The mole is the amount of substance in a system that has the same number of fundamental entities as atoms in 0.012 kilogramme of carbon 12.
In order to determine the moles, divide the mass of the substance by its molar mass to convert grams into moles.
Grams to moles conversion factor,
[tex]Grams\;.\;\frac{1\;mol}{grams}\;=\;Moles[/tex]
Moles of silver comes out to be,
[tex]=\frac{Grams}{molar\;mass} \\= 3.50\;g\;.\;\frac{1\;mol}{107.86\;g} \\= 0.0324\;mol[/tex]
Hence the correct answer is 0.0324 g of Ag.
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How many moles of methane (CH4) is
6.70 x 1022 atoms of methane?
Answer:
0.1113 mol
Explanation:
Data Given:
no. of atoms of CH₄= 6.70 x 10²² atoms
no. of moles of methane (CH₄) = ?
Solution:
we will find no. of moles of methane (CH₄)
Formula used
no. of moles = no. of atoms / Avogadro's number
Where
Avogadro's number = 6.022 x 10²³
Put values in above equation
no. of moles = 6.70 x 10²² atoms / 6.022 x 10²³ (atoms/mol)
no. of moles = 0.1113 mol
So,
There are 0.1113 moles of methane.
The speed of a chemical reaction
a. is constant no matter what the temperature is.
b. is independent of the amount of contact surface of a solid involved.
c. between gases should in all cases be extremely rapid because the average kinetic energy of the
molecules is great.
d. between ions in aqueous solution is extremely rapid because there are no bonds that need to be
broken.
1
Answer Option c. between gases should in all cases be extremely rapid because the average kinetic energy of the molecules is great.
what is the name of NiI2
Answer:
The name of that compound is Nickel(||)iodide
Answer: Nickel(II) iodide
Explanation:
What impact does CO2 in the atmosphere on us and the earth?
There are three ways in which heat be transferred - conduction, convection, and radiation. Which types of thermal transfer involves fluids of different temperatures and densities?
Answer:
Convection.
Explanation:
Let us define each of the type of thermal transfer first:
- radiation is heat transfer that does not include contact between the objects. It's mediated by infra-red radiation, waves from the invisible radiation spectrum.
- conduction is heat transfer which is mediated through direct contact between objects (holding a hot cup of tea, for example)
- convection is a heat transfer found in gases and liquids. Due to different temperatures in two parts of liquid, there will also be a different density ( hotter parts have lower density). Lower density parts will start moving upwards while higher density parts, due to gravity, will move downward. As they move, they will gain or receive heat, which will cause new temperature differences and the moving will restart.
Convection is the method of heat transfer that involves the movement of fluids with different temperatures and densities. Conduction involves direct contact between objects, and radiation transfers heat via electromagnetic waves. These methods can occur simultaneously and are driven by temperature differences.
Heat can be transferred in three ways: conduction, convection, and radiation. Among these, convection involves the movement of fluids (liquids or gases) of different temperatures and densities. When a fluid is heated, it becomes less dense and rises, while cooler, denser fluid sinks, creating a circulatory movement known as a convection current.
This process of heat transfer is evident in phenomena such as boiling water, where the hot water at the bottom rises to the top as it warms up, or in atmospheric circulations like sea breezes.
Conduction, in contrast, is the transfer of heat between two objects in direct contact with each other, and it occurs in solids, liquids, and gases, though it is most efficient in solids. Radiation is the transfer of energy by electromagnetic waves and can occur through a vacuum, as in the case of heat from the sun reaching Earth.
All three heat transfer methods are driven by a temperature difference and can occur simultaneously under certain conditions.
Element X has two naturally-occurring isotopes. X-10 has a 19.9% abundance and X-11 has an 80.1% abundance. What is most likely the identity of element X?
Answer:
The identity of element X is Boron (R.A.M =10.81)
Explanation:
We are given;
Element X,
First Isotope, X-10, with an abundance of 19.9%Second isotope, X-11 with an abundance of 80.1%We are required to identify the element X
To identify the element we need to determine it R.A.M.Then, how do we get R.A.M of an element?
R.A.M. = ((Mass of isotope-1 × R. abundance) + (mass of isotope-2 × R. abundance)) ÷ 100
Therefore, in this case;
R.A.M. of X = ((mass of X-10 × R.abundance) + (mass of x-11 × R. abundance))÷ 100
Thus;
R.A.M of X = ((10 × 19.9) + (11 × 80.1)) ÷ 100
= 10.81
Thus, the relative atomic mass of X is 10.81.
The identity of element X is Boron. (Boron has an R.A.M of 10.81)
The element X in the question is most likely boron, as the isotope abundances given closely match those of boron's two naturally-occurring isotopes, boron-10 and boron-11.
Explanation:The question is asking about the identity of element X which has two naturally-occurring isotopes: X-10 with an abundance of 19.9% and X-11 with an 80.1% abundance.
These percentages closely match the abundances of the isotopes of the element boron. Boron has two isotopes - boron-10 with a mass of 10.0129 amu and a 19.9% abundance, and boron-11 with a mass of 11.0093 amu and an 80.1% abundance.
An isotope refers to different forms of the same element that contain the same number of protons but different numbers of neutrons. The isotopic abundances on earth can be used to identify elements with particular isotopic compositions, such as in this case.
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Select the choice that best completes the following sentence. Simple machines A. cannot be combined to make compound machines. B. are tools that make work easier. C. reduce the amount of energy needed to do work. D. are made up of multiple moving parts.
B because machined make work 2x more work or higher
Final answer:
The best choice is B. Simple machines are tools that make work easier by providing a mechanical advantage, meaning they can change the amount of force required to do work, although the total work done remains constant due to the conservation of energy.
Explanation:
The choice that best completes the following sentence is option B: Simple machines are tools that make work easier.
Simple machines, such as levers, gears, pulleys, wedges, and screws, are devices used to multiply or augment a force we apply often at the expense of a distance through which we apply the force. They do not decrease the total amount of work that needs to be done. According to the principle of conservation of energy, a machine cannot output more work than the energy put into it. Instead, simple machines are beneficial because they can change the amount of force required to do work by providing a mechanical advantage (MA), even though the product of force and distance (which equals work) must remain constant.
Based on the description of geothermal energy, how does magma convection aid in the production of geothermal energy?
Answer:
Magma convection moves heat from Earth’s deep interior up to the crust, where it can be used to produce energy.
Explanation:
Magma convection aid in the production of geothermal energy is that Magma convection moves heat from Earth’s deep interior up to the crust, where it can be used to produce energy.
What is geothermal energy?
It is a type of energy which is having its source from the crust of the earth that is is is mainly given by the earth's crust
This originates from the formation of planets and radioactivity. The high temperature and pressure in Earth's interior cause some rock to melt and the solid mantle to behave plastically.
This results in parts of the mantle convicting upward since it is lighter than the surrounding rock.
Mostly used in electricity production in geothermal plants. a distinction is made between two different types of geothermal: direct use and indirect use.
Therefore, it is geothermal energy.
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do you think that the mole should be considered a base unit in the SI system?
Answer:
No, the SI units are for measuring.
Explanation:
explain wHY does dissolving coffee in hot water become physical change
what are the period and group trends in electronegativities
Electronegativity of an element decreases as we move down a group on the periodic table and electronegativity increases while moving from left to right across a period on the periodic table.
Explanation:
The electronegativity increases as we move from left to right across a period because from left to right across a period, the nuclear charge is increasing Hence the attraction for the valence electrons also increases. As we move down a group, the atoms of each element have an increasing number of energy levels. The distance between the nucleus and valence electron shell increases and reduces the attraction for valence electrons. Hence electronegativity decreases as we move from top to bottom down a group.Particles in 2.15 moles of gold
Answer: 1.29 x 10^24 Particles
Explanation: 1mole of gold contains 6.02x10^23 Particles
Therefore, 2.15 moles of gold will contain = 2.15 x 6.02x10^23 = 1.29 x 10^24 Particles
y is it necessary to use clear colourless oil in the determination of melting point of naphthalene
Answer:it is necessary to use colourless
Explanation: A pure substance generally has a melting range (the difference between the temperature where the sample starts to melt and the temperature where melting is complete) of one or two degrees. Impurities tend to depress and broaden the melting range so the purified sample should have a higher and smaller melting range than the original, impure sample
Clear colourless oil is necessary in determining the melting point of naphthalene, as it allows for uniform heat distribution, accurate temperature readings, and better viewing of the changes in the sample's state.
Explanation:Clear colourless oil is used in the determination of the melting point of naphthalene to ensure accurate readings. The oil serves as a medium to uniformly distribute heat around the naphthalene sample. If the oil were coloured or not transparent, it would absorb some of the heat, thereby affecting the temperature distribution and potentially the accuracy of the melting point. In addition, the clear oil helps let visible light pass through, allowing for better viewing of the naphthalene as it changes from solid to liquid. Therefore, achieving accurate results in this experiment heavily relies on the use of clear colourless oil.
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What is an example of a colloid?
A. Soda
B.Fog
C.Jewelry
D.Silverware
Answer:
B. fog
Explanation:
This is because a liquid (water) is dispersed throughout the air (gas)
A colloid has two or more phases, where the dispersed phase is distributed throughout the continuous phase. The example of a colloid is Fog. Option B is correct.
A colloid is a type of homogeneous mixture that is made up of two or more different substances that are uniformly mixed but not chemically bonded.
Colloids can be seen in everyday life with many examples. Let's look at some examples of colloids which are as follows: Examples of colloids.
Fog or Mist: The fog and mist that we see on the earth's surface, especially on a cold winter morning, is an example of a colloid. In this mixture, tiny water droplets are dispersed in the air.
Jelly: When the soluble gelatin protein dissolves in boiling water and cools down, it forms a colloid known as jelly. In this, the continuous phase is water, while the dispersed phase is protein.
Toothpaste: It is also an example of a colloid that is formed by mixing a liquid and solid dispersed in a liquid medium. The dispersed phase is a solid particle (usually chalk) while the continuous phase is a liquid.
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What is the mass of 2.3 x 1021 formula units of cobalt(II) bromate?
Molecular mass of Cobalt(II) Bromide = 218.7412 g/mol .
Explanation:
Percent composition by element:
The procedure to find the Molecular mass of Cobalt(II) Bromide:
The symbol of the Cobalt is Co.
The symbol of the Bromate is Br.
The Element cobalt have the Atomic Mass of 58.933200 with 1 number of atom.
The Element Bromine have the Atomic Mass of 79.904 with 2 number of atoms.
Molecular weight calculation:
To find the molecular mass we have to sum both of the Atomic masses:
For Cobalt(II) Bromide: We have to multiple the Atomic mass of bromate with 2 and then sum the atomic masses
[tex]58.9332+79.904 \times 2 =218.7412g/mol[/tex]
Molecular mass of Cobalt(II) Bromide = 218.7412 g/mol
hich of these statements is supported by the results of Thomson’s experiment? Check all of the boxes that apply.
Answer:
Cathode rays are made up of negatively charged particles.
Atoms contain negatively charged particles.
Explanation:
Answer:
B. Cathode rays are made up of negatively charged particles
C. Atoms contain negatively charged particles
Explanation:
Edge 2021
What happens during the light reaction of photosynthesis?
1.Water molecules split apart 2.Carbon dioxide is combined with glucose
3.Water molecules combine to make food. 4. Air and water create energy for a plant
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During the light reaction of photosynthesis Water molecules split apart.
1. Water molecules split apart
Explanation:
Photosynthesis is the method by which plants, some bacteria and some protistans, a eukaryotic organism utilise the energy from daylight to generate Water molecules split apart. This can be turned into pyruvate which issues adenosine triphosphate (ATP) by cellular breath. This light initiated chlorophyll will part the water particle. This procedure is called Photolysis. Water atom is part to discharge H+ particles and furthermore oxygen.
Answer:
1.Water molecules split apart
Explanation:
Photosynthesis occurs in two stages.; Light phase and dark phase.
During the light phase, water molecules split apart when sunlight reaches them to produce hydrogen and oxygen together with electrons that enter into the electron transport chain. This is known as the photolysis of water.
This is the first stage of photosynthesis. The products of this reaction are involved in the dark stage of photosynthesis which occurs in the absence of sunlight.
Is Copper (II) Sulphate soluble in water? Please explain your answer. Thank youuuu
Answer: Copper (II) Sulphate is soluble in water.
Explanation: CuSO4 is an ionic salt that is attracted to polar molecules such as water. So it makes it dissolve in water but it takes more time so increasing the temperature of water increases the dissociation process.
in short yes copper is soluable
Elements are arranged in the periodic table based on various patterns. For example, elements found in the rows near the top A. all have the same atomic number. B. have the same atomic numbers as the elements in the rows near the bottom. C. have higher atomic numbers than the elements in the rows near the bottom. D. have lower atomic numbers than the elements in the rows near the bottom.
Answer:
D.
Explanation:
I just did the question and a was wrong.
It said D was correct.
Answer: D. have lower atomic numbers than the elements in the rows near the bottom
Explanation: