Answer:
If a gas has experienced a small increase in volume but has maintained the same pressure and number of moles, the temperature of the gas will DROP.
Explanation:
According to Boyle’s law of ideal gases, volume and temperature of a gas is inversely related, as long as the pressure is kept constant;
P₁V₁/T₁ = P₂V₂/T₂
Therefore, if the volume of the gas increases, the temperature will definitely decrease due to the inverse relationship. The gas will get cooler.
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Answer:
Choices:
A. It has increased two times.
B. It has increased slightly.
C. It has decreased slightly.
D. It has stayed the same.
Explanation:
The correct answer is B. Edge2021
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.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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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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explain wHY does dissolving coffee in hot water become physical change
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.
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:
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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.
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
Before Sam left for work, he noticed that his car was covered with snow and so went out and started the engine to let it warm up before he left. After eating breakfast, Sam went back to his car to leave for work and noticed that there was no longer any snow on the hood of the car, but the rest of the car still had snow on it. Which of the following correctly explains what Sam witnessed?
A.
The cold from the snow went to the air, which melted the snow.
B.
The cold from the snow was transferred to the car, which melted the snow.
C.
Heat from the engine under the hood transfered to the snow, melting it.
D.
Heat from the air above the car was transferred to the snow on the hood only.
Answer:
Heat from the engine under the hood transfered to the snow, melting it.
Explanation:
((Study Island))
Near the ceiling of a room air is warmer. The warm air rises because of
Answer:
convection
Explanation:
heat will always rise
Answer:
Convection
Explanation:
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.
what is the name of NiI2
Answer:
The name of that compound is Nickel(||)iodide
Answer: Nickel(II) iodide
Explanation:
What is the kinetic energy of the ball as it is half way through the fall?
Answer:
Explanation:
What is the kinetic energy of the ball as it is half way through the fall?
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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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
What impact does CO2 in the atmosphere on us and the earth?
The particles that are found in the nucleus of an atom are
a. neutrons and electrons
c. protons and neutrons
b. electrons only
d. protons and electrons
Answer: option c. protons and neutrons
Explanation:
Answer: Protons and Neutrons
Explanation: The nucleus is a dense structure in an atom. It consists of positively charged protons and neutrally charged neutron. This makes the nucleus a positively charged region in an atom.
if you were trying to heat 1g water from temperature of 5C to 6 C, how much heat would be required to do so?
Answer:
The heat required is 4.18 J
Explanation:
First you need to know what is specific heat capacity ,
Specific Heat Capacity : The amount of heat required to raise the temperature of 1 gram of substance by one degree .
The specific heat capacity of water is 4.18 J/gC.
This means that to increase the temperature of 1 gram of water by one degree , 4.18 J of energy is needed.
The formula to calculate the heat is given by :
[tex]q=mc\Delta T[/tex]
q = heat absorbed/emitted
m = mass of the substance
[tex]\Delta T[/tex] = Change in temperature
c = 4.18 J/gC
Here , m= 1 gram
[tex]\Delta T[/tex]= 6 -5 = 1 degree
Put the value in the formula:
[tex]q=mc\Delta T[/tex]
[tex]q=1\times 4.18\times 1[/tex]
q = 4.18 J
Unit conversion :
m = gram
c = J/gram C
T = C
q = mcT = gram x J/gram C x C
q = J
Which substance would most likely need to cool to the lowest temperature before it condenses?
Answer:
A
Explanation:
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:
During a science lab investigating chemical reactions, Mr Grace students place an antacid tablet in a ziplock bag. They recorded the mass of the tablet, 25 g, in the bag, 60 grams. Then they carefully added 50 g of water and quickly seal the bag. The tablet began at this and soon disappeared. The bag was filled with gas. If the total mass of the bag+tablet+water was 135 grams before the reaction, what was the total mass of the bag+liquid+gas after the reaction was completed? A) 60 grams B) 75 grams C) 135 grams D) 270 grams
Answer:
Option- C (135 grams) is the correct answer.
Explanation:
In this experiment the students took tablet of an antacid which when added to water decomposes and produces many products among which some are in gas form. Now, as stated the ziplock bag is quickly sealed after the addition of tablet so it means nine of the gas produced is allowed to escape from the bag.
Therefore, according to law of conservation of mass the mass can neither be created nor destroyed. So, in this experiment there will be no increase in mass because the mass cannot be created and also, there will be no decrease in mass because it can neither be destroyed. So, we will assume that the gas produced is not allowed to escape hence, the total mass of the system (i.e. bag, water, products) will remain the same as they were before the reaction.
Answer:
135 grams
Explanation:
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.
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:
A warm front moves into a region. What kind of weather most likely results?
A. Cold
B. Stormy
C. Clear
D. Hot
Answer:
B
Explanation:
it depends if the weather was cold but ummm they warm and cold air would mix and turn story and watch out tornadoes could also happen
Answer:
Stormy
Explanation:
Apex
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.
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.
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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(50 points!) This diagram is a model of the fluorine atom.
How many electrons, protons, and neutrons are in this atom, and how many additional electrons are needed to completely fill the outer shell of this atom?
A.
9 electrons, 11 protons, 9 neutrons; 0 electrons are needed to completely fill the outer shell of this atom
B.
9 electrons, 11 protons, 9 neutrons; 1 additional electron is needed to completely fill the outer shell of this atom
C.
9 electrons, 9 protons, 11 neutrons; 1 additional electron is needed to completely fill the outer shell of this atom
D.
9 electrons, 9 protons, 11 neutrons; 0 electrons are needed to completely fill the outer shell of this atom
Answer:
C
Explanation:
One electron is needed to completely fill the outer shell of this atom.
The number of electrons, protons, and neutrons in the atom are:
Number of electrons = 9
Number of protons = 9
Number of neutrons = 11
The number of additional electron needed is 1
The correct answer to the question is Option C. 9 electrons, 9 protons, 11 neutrons; 1 additional electron is needed to completely fill the outer shell of this atom
Fluorine is a member of the group 17 element called Halogens. They have 7 valence electrons.
NOTE: The nucleus contains the neutrons and the protons while the electrons revolve around the nucleus.
From the diagram given above, the following data were obtained:
Number of electrons = 9
Number of protons = 9
Number of neutrons = 11
Valence electron = 7
Now, we can see that the fluorine atom has 7 valence electrons. Thus, fluorine atom will require 1 electron to complete its outermost shell.
Thus, the correct answer to the question is Option C. 9 electrons, 9 protons, 11 neutrons; 1 additional electron is needed to completely fill the outer shell of this atom
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A graph can help scientists display and convey data. what part of a line graph shows trends?
Answer:
The line of best fit
Explanation:
The line of best fit is the average, aka a trend
In a line graph, the line itself, connecting data points, shows trends. Scientists analyze its slope and direction to understand patterns and variations in the data.
In a line graph, the trends are primarily represented by the line itself. A line graph is a type of chart that displays data points connected by a continuous line. Each data point typically represents a pair of values, one on the horizontal axis (usually the independent variable) and one on the vertical axis (usually the dependent variable).
The line in a line graph shows how the dependent variable changes as the independent variable varies. By examining the direction, slope, and shape of the line, scientists and researchers can identify and communicate various trends in the data. Here's how:
1. Direction of the Line: The direction of the line indicates whether the dependent variable is increasing or decreasing as the independent variable changes. A rising line suggests an increase in the dependent variable, while a falling line suggests a decrease.
2. Slope of the Line: The slope of the line represents the rate of change of the dependent variable concerning the independent variable. A steeper slope indicates a more rapid change, while a shallower slope suggests a slower change.
3. Curvature of the Line: Sometimes, the line may curve, indicating a nonlinear relationship between the variables. The curvature might imply acceleration, deceleration, or other complex patterns.
In addition to the line itself, trendlines or best-fit lines can be added to a graph to provide a smoother representation of the overall trend in the data. These trendlines help researchers make predictions and identify general patterns within the data.
Overall, a line graph is a powerful tool for visualizing and conveying data trends, making it a valuable tool in scientific research, data analysis, and communication. Researchers can quickly grasp the direction and magnitude of changes in the dependent variable as it relates to variations in the independent variable.
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