Answer:
A. Able to be lost or gained in chemical reactions.
Explanation:
Only electrons are lost or gained.
Able to be lost or gained in chemical reactions. Hence, option A is correct.
What are atoms?An atom contains a central nucleus surrounded by one or more electrons.
A chemical reaction is not created or destroyed, it simply moves electrons from one atom to another, and does not change the nucleus of the atoms. The total mass of the matter remains conserved in any chemical change.
Hence, option A is correct.
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Please help with this exercise
Answer:
neutralization is a chemical reaction in which acid and a base react quantitatively with each other. In a reaction in water, neutralization results in there being no excess of hydrogen or hydroxide ions present in the solution.
the ore copper is extracted from: Chalcopyrite
The process or result of oxidizing or being oxidized.
the action or fact of making a specified thing smaller or less in amount, degree, or size.
I can't answer the other ones. sorry
Which bond is intermediate in terms of strength? why is it weaker than the strongest? ap bio?
Answer:
Covalent bonds are intermediate in strength and weaker than ionic bonds
Explanation:
Because ionic bonds tend to form a rigid lattice structure that make them more stronger and difficult to remove electrons from them
Scientists often investigate alternative explanations for the data and observations presented, even once a hypothesis has been tested and supported through an experiment. This investigation of alternative explanations 1. proves that scientific theories are not able to be disproven. 2. demonstrates that scientific theories are based on opinions. 3. strengthens the evidence and support for a scientific theory. 4. keeps the scientific community competitive and motivated.
Answer:
Explanation:
its 2
The scientific method is an order of steps that is followed and the first step of scientific inquiry is often ____________________________________
Group of answer choices
Design the experiment
Interpret data
develop a hypothesis
Developing the problem
Answer:
Developing the problem
Explanation:
In order to have an experiment or to make the experiment's data useful, you must first find a problem to solve.
what is the mass of 1500ml of ethyl alcohol if the density of the alcohol is 0.789 g/ml
Given :
Volume of ethyl Alcohol = 1500 ml Density = 0.789 g/mlTo Find :
Mass of ethyl alcoholSolution :
Formula for density is :
[tex]\boxed{\sf{Density\ =\ \dfrac{Mass}{Volume}}}[/tex]
⇒0.789 = Mass/1500
⇒ Mass = 0.789 * 1500
⇒ Mass = 1,183.5 g
Hence, Mass of ethyl alcohol is 1,183.5 g.
What is the structural formula of 2-bromo-3-chloro-4,4-dimethylpentanal
Explanation:
5 carbons with their substituents being bromo,chloro and dimethyl
I numbered form 1 to 5 from left to right hence the diagram above
The structure of the compound is shown in the image attached to this answer.
We have to remember that the whole idea of IUPAC nomenclature is to create a generally accepted system of chemical nomenclature such that the structure of a compound can be drawn from its name.
From the name 2-bromo-3-chloro-4,4-dimethylpentanal, we can see that the alkanal moiety should occupy position 1. Counting from that position, the bromime is the next substituent (position 2). The chlorine follows (position 3) and the two methyl groups (position 4) as shown in the image attached.
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at 25*C, the vapor pressure of pure water is 23.8 torr. a solution is prepared by dissolving 0.30 mol Na2SO4 in 8.0 moles of water. what is the vapor pressure of this solution at 25*C
Answer:
Vapor pressure of the solution is 22.9 torr at 25°C
Explanation:
When a non volatile solute is added to a pure solvent, the vapour pressure of the mixture decrease regard to the pure solvent following the equation (Raoult's law):
[tex]P_{solution}=X_{solvent}.P^0_{solvent}[/tex]
Where vapour pressure of the pure solvent (Water) is 23.8torr at 25°C.
Mole fraction of water is the ratio between moles of water and total moles in solution. The solution has a mole fraction of water of:
[tex]X_{water}=\frac{8.0Moles_{water}}{0.30mol_{Na_2SO_4}+8.0mol_{water}} = 0.9639[/tex]
Replacing in Raoult's law:
[tex]P_{solution}=0.9639*23.8torr[/tex]
Vapor pressure of the solution is 22.9 torr at 25°CWhich state of matter has the leader molecular motion explain your answer
Someone please answer this one as soon as you see it thank you so much for your time
1. The volume of a given mass of gas is 720 ml at 15°C. Assuming
constant pressure, at what temperature will its volume be 960 ml?
2. A sample of gas is found to occupy a volume of 900 cm3 at 270
°C. Calculate the temperature at which it will occupy a volume of
300 cm3, provided the pressure is kept constant.
please mark my answer brainliest...
condition...pressure remains constant.
for 720 ml temp is 15°...so for 960ml temp will be 15/720×960=20°...(.answer for 1st part...)for 900cmcube temp is 270°C...so for300cmcube temp will be 270/900×300=90°....(answer for 2nd part)...I hope it helps the dear students...and if it is then let me know through ur comments...and please mark my answer as brainliest...plz...1. The temperature at which the volume of gas has been 960 ml is [tex]\rm \bold{19.99\;^\circ C}[/tex].
2. The temperature at which the volume of gas has been [tex]\rm 300\;cm^3[/tex] is [tex]\rm \bold{90^\circ C}[/tex].
1. The gas has been assumed to be an ideal gas. For an ideal gas, the relationship between temperature and volume at constant pressure has been given as:
[tex]\dfrac{V1}{T1}=\dfrac{V2}{T2}[/tex]
Where, the initial volume, [tex]V1=720\;\text {ml}[/tex]
The final volume, [tex]V2=960\;\text {ml}[/tex]
The initial temperature, [tex]T1=15\;^\circ \text C[/tex]
Substituting the values, the final temperature, T2 can be given as:
[tex]\rm \dfrac{720\;ml}{15\;^\circ C}=\dfrac{960\;ml}{\textit{T}2} \\\textit T2=\dfrac{15\;^\circ C}{720\;ml}\;\times\;960\;ml\\\textit T2=19.99\;^\circ C[/tex]
The temperature at which the volume of gas has been 960 ml is [tex]\rm \bold{19.99\;^\circ C}[/tex].
2. The temperature for gas to occupy [tex]\rm 300\;cm^3[/tex] has been given as:
Where, the initial volume, [tex]V1=900\;\rm{cm^3}[/tex]
The final volume, [tex]V2=300\;\rm {cm^3}[/tex]
The initial temperature, [tex]T1=270\;^\circ \text C[/tex]
Substituting the values, the final temperature, T2 can be given as:
[tex]\rm \dfrac{900\;cm^3}{270\;^\circ C}=\dfrac{300\;cm^3}{\textit{T}2} \\\textit T2=\dfrac{270\;^\circ C}{900\;cm^3}\;\times\;300\;cm^3\\\textit T2=90\;^\circ C[/tex]
The temperature at which the volume of gas has been [tex]\rm 300\;cm^3[/tex] is [tex]\rm \bold{90^\circ C}[/tex].
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Plz help What is contact process??give detail?
Answer:
This is the current method of producing sulphuric acid in the high concentrations needed for industrial processes.
Explanation:
This is the meaning of CONTACT PROCESS.
Hope it helps.
Abigail obtained 40.2 grams of calcium carbonate after performing a reaction. From her calculations, she knew she should have obtained 45.8 grams. What was her percent yield? Round your answer to one place behind the decimal. Do not include the unit.
Answer:
Percent yield = 87.77%
Explanation:
Given:
Actual yield = 40.2 grams
Theoretical yield = 45.8 grams
Find:
Percent yield
Computation:
Percent yield = [Actual yield / Theoretical yield] 100
Percent yield = [40.2 / 45.8] 100
Percent yield = 87.77%
How many seconds in the school year? (One school year is 180 days long.) Please show your work, and report your answer with the correct number of significant figures and appropriate units.
Answer:
259200
Explanation:
multiply 180×24×60
259,200 seconds
180 × 24 hours = 4320 hours
4320 × 60 minutes = 259200 minutes
259200 × 60 seconds = 15552000 seconds
Critical Thinking Challenge: A student has a part time
job in which she works 4 hour shifts. Her pay scale is
$8.25 per hour. How many Shifts does she need to
work to earn $220?
The question gave you 2 conversion factors, start your
problem with $220.
Answer:
6⅔ shifts
Explanation:
From the question given:
A shift = 4 hours
Pay = $8.25 per hour
Next, we shall determine the number of hours that will result in a pay of $220. This can be obtained as follow:
$8.25 = 1 hour
Therefore,
$220 = $220 × 1 hour / $8.25
$220 = 220/8.25 hours.
$220 = 80/3 hours
$220 = 26⅔ hours
Therefore, it will take 26⅔ hours to receive a pay of $220.
Finally, we shall determine the number of shifts in 26⅔ hours. This can be obtained as follow:
4 hours = 1 shift
Therefore,
26⅔ hours = 26⅔ ÷ 4
26⅔ hours = 80/3 × 1/4
26⅔ hours = 80/12
26⅔ hours = 20/3
26⅔ hours = 6⅔ shifts
Therefore, she will work 6⅔ shifts in order to receive a pay of $220
What is a pure substance - bread, salt, seawater, or soil?
Answer:
Salt is the pure substance out of them all.
Answer: Salt is a pure substance. Pure substances are composed of one type of molecule. All of the substances listed are composed of two or more types of molecules, except for salt. Therefore, salt would be your answer.
Hope this helps.
The Periodic Table is organized into or by _________________. A. All of these B. Groups C. Increasing atomic number D. Properties
Answer:
My best bet is to go with A. All of these
What is the difference between a scientific thenry and a scientific law?
Answer:
Scientific theories are still to be proven while as scientific laws are already proven.
What’s the difference between a chart and a table?
Answer:
Tables and charts are both used to represent data. However, the manner and circumstances in which each is used, distinguishes them from one another. Tables represent facts and figures in a row and column format which makes the data easier and faster to read and compare. On the other hand, charts represent data in a more graphical manner which may include lines, bars and circles.
Explanation:
I Hope This Helps! ^^
Answer:
A pie chart is a graph in which a circle is divided into sectors, each of which represents a percentage of the overall. Its goal is to show percentages at a specific time in history. Pie charts, unlike bar and line graphs, do not illustrate changes over time. Tables sort the data rationally in a row-and-column format, much to spreadsheets. Tables are used to arrange information that is too detailed or complex to be fully described in a text, allowing the reader to see fast results. They can be used to highlight data trends or patterns, as well as to remove numeric data from a document to make it more readable.
Explanation:
:)
Why should an individual working with chemicals understand the hazard coding system
on a chemical label?
Answer:
Explanation:
The hazard coding system (developed by the National Fire Protection Association, NFPA) helps the individual working with chemicals to know which chemical is a health hazard, inflammable hazard or a reactivity hazard. This makes the individual makes informed decisions while handling such chemicals and also assists the individual or first responders to know what to or not to do in emergency cases or accident (like contact with the skin).
NOTE: The colour code used here have the meanings below
Red: flammability/fire hazard
Blue: health hazard
Yellow: reactivity hazard
White: special hazard
How many moles of lithium hydroxide would be required to produce 35.0 g of Li₂CO₃ in the following chemical reaction? 2 LiOH(s) + CO₂(g) → Li₂CO₃(s) + H₂O(l)
Answer:
0.947 mol LiOH
Explanation:
2 LiOH + CO₂ ⇒ Li₂CO₃ + H₂O
Convert grams of Li₂CO₃ to moles. The molar mass is 73.891 g/mol.
(35.0 g Li₂CO₃)/(73.891 g/mol Li₂CO₃) = 0.4737 mol Li₂CO₃
Use the mole ratio between LiOH and Li₂CO₃ to covert moles of Li₂CO₃ to moles of LiOH.
0.4737 mol Li₂CO₃ × (2 mol LiOH/1 mol Li₂CO₃) = 0.9474 mol LiOH
Round for proper significant figures.
0.9474 ≈ 0.947 mol LiOH
3. The sum of gravitational potential energy and kinetic energy is called mechanical
energy. Use Figure 2 to find the mechanical energy of an idealized pendulum at a
variety of times in its cycle. Identify any pattern you notice in the values of
mechanical energy.
Pls helpp
Answer:
Explanation:
Mechanical energy = Kinetic energy + Potential energy
We shall calculate mechanical energy at different points of time .
Time Kinetic energy Potential energy mechanical energy
0 0 4 4
2 2 2 4
4 4 0 4
6 2 2 4
8 0 4 4
10 2 2 4
and so on ........
Hence we see that total mechanical energy is constant at the value of 4
at all time .
Mg2+ ?
-magnesium ion
-sodium ion
-manganese ion
-calcium ion
Answer:
Magnesium ion.
Explanation:
Before charge= 2.8.2
after charge= (2.8)2+
I need help with number 3 please look at the picture!!
Answer:
Answer is (a)
Explanation:
Calculate the volume in liters of a 29.8 g/dL nickel(II) chloride solution that contains 131. G of nickel(II) chloride . Be sure your answer has the correct number of significant digits.
Answer:
0.44 L.
Explanation:
Density of nickel(II) chloride = 29.8 g/dL.
Mass of nickel(II) chloride = 131 g
Volume of nickel(II) chloride =?
Next, we shall convert 29.8 g/dL to g/L. This can be obtained as follow:
Recall:
1 g/dL = 10 g/L
Therefore,
29.8 g/dL = 29.8 x 10 = 298 g/L
Therefore, 29.8 g/dL is equivalent to 298 g/L.
Finally, we shall determine the volume of nickel(II) chloride as follow:
Density of nickel(II) chloride = 298 g/L
Mass of nickel(II) chloride = 131 g
Volume of nickel(II) chloride =?
Density = mass /volume
298 = 131/Volume
Cross multiply
298 x Volume = 131
Divide both side by 298
Volume = 131/298
Volume = 0.44 L
Therefore, the volume of of nickel(II) chloride is 0.44 L
A scientist conducts experiments to test what temperature causes the fastest growth rate in sunflower plantsafter multiple trials the results show that sunflower plants grow the fastest at 75 FIs this experement an example of replication or repetition?
Answer:
Repetition
Explanation:
In the world of science, experiments are regularly conducted to test out hypotheses. These experiments are however, not conducted by scientist once to derive a result. They are rather conducted multiple times (repeated) to ascertain the accuracy i.e not as a result of random occurrence. The experiments that undergo multiple trials are said to undergo REPETITION.
This is the case of the scientist in this question, who is conducting an experiment to test what temperature causes the fastest growth rate in sunflower plants. He conducted the experiment multiple times, making it an example of REPETITION.
N.B: Replication is when the experiment is re-conducted by another scientist to see if same result is derived.
A turtle moves at a speed of 1.0km/h. How fast is the turtle moving in meter per second (m/s)?
The speed of the turtle is 9.41 centimeters per second.
Calculation of speed:We know that
Speed of small turtle = 566 furlong/fortnight
1 furlong = 20,116.8 cm
And,
1 fortnight = 1,209,600 seconds
So,
The speed of the turtle is 9.41 centimeters per second.
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calculate no of moles in 42g of carbon ?
Answer:
[tex]\huge\boxed{n = 3.5\ moles}[/tex]
Explanation:
Given :
Mass in grams = m = 42 g
Molar Mass = M = 12
Required:
No. of moles = n = ?
Formula :
m = m / M
Solution:
n = 42 / 12
n = 3.5 moles
Length of a year. 31,560,000.0 seconds = 3.156 X 10^7 seconds
How do I convert into scientific notation
Answer: 3.156 * 10^7
Explanation: I do not really understand your question. You answered it yourself!
Scientific notation shortens large numbers. The number right after the decimal point can only be between 1 and 9, which you did correctly. When converting to scientific notation, the exponent of ten is based on how many places you moved the decimal and the direction you moved it (left, positive; right, negative). In this case, the exponent of ten is a positive seven.
You did everything correctly :) Good job!
What are two things required for something to be matter?
What 3 athletic events do not use the SI unit of measurement
Answer:
Long jump doesn't use the SI unit of measurement
which two quantities are used to predict gravitational force according to newton's law of universal gravitation
Answer:
Observe how the force of gravity is directly proportional to the product of the two masses and inversely proportional to the square of the distance of separation.
Explanation:
I think im not sure