30 Points!! 15 Each Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!
Answer: 22: C
23: A
24: A
25: D
26: B
Explanation: I hope that this helped :)
Answer:
22) b. stainless steel.
23) c. they are all substances.
24) b. a compound can only be separated into its components by chemical means.
25) a. substances are compounds, mixtures are not.
26) b. capitalized
extra: not 100 percent sure of 25
On the periodic table, why are all noble gases placed in column 18 (8A)?
A.Noble gas elements have identical molar masses.
B.Noble gases are all rarer than elements in other columns.
C.The noble gases only chemically react with other noble gases.
D.The valence electron configuration is similar in all noble gas elements.
Answer:
D
Explanation:
In the periodic table the noble gases are place in same column because the valence electron configuration is similar in all noble gas elements. Thus option D is correct.
What is periodic table?A periodic table is defined as an organization of all known elements in increasing atomic number and repeating chemical properties.
It can also be defined as a tabular arrangement of chemical elements ordered by increasing atomic number and element groups.
There are more than 118 elements are arranged in modern periodic table.
Noble gases are defined as any of a class of rare gases that includes helium, neon, argon, krypton, xenon, and, most commonly, radon and display high stability and extremely low reaction rates.
Electronic configuration are defined as the electron configuration around the nucleus of a specific atom or molecule.
Thus, in the periodic table the noble gases are place in same column because the valence electron configuration is similar in all noble gas elements. Thus option D is correct.
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The half-life of a radioisotope
a
gets shorter with time
b
is constant
c
get shorter with increasing temperature
d
decreases by a factor of two each time
e
become longer over time
Answer:
b is constant
Explanation:
The half-life of a radioisotope is constant throughout its life cycle.
Half-life is the time taken for half of the radioactive nuclei to disintegrate.
Every radionuclide has its characteristic half-life and it is independent of the number of radioactive atoms.
The half-life does not depend on any variable. It is an inherent property of a radioactive isotope. The shorter the half-life, the faster a radionuclide decays. Nuclides with a long half life are fairly stable for a long period of time. The decay of a radioactive element is usually characterized by its half-life.Therefore, the most ideal statement about half-life is that it is constant.
The change of state in which a solid becomes a liquid is called ______. a liquefaction b melting c condensation d sublimation
The process of water migrating from areas of low electrolyte concentration to area of high electrolyte concentration is called ———————. ——————— is the medicine term for the swelling of the brain
Answer:1-Diffusion
2-Cerebral edema
Explanation:
The process of water migrating from areas of low electrolyte concentration to areas of high electrolyte concentration is called diffusion.
Cerebral edema is the medical term for the swelling of the brain.
What is diffusion?Diffusion is a process where the substance or ions of from a low concentration to a high concentration. It occurs against the concentration gradient, so it needs energy.
Cerebral edema is a condition where fluid gets filled in the brain and the brain swells and make pressure on the skull called intracranial pressure.
Thus, Diffusion is the mechanism by which water moves from regions with low electrolyte concentrations to regions with high electrolyte concentrations.
The medical term for brain swelling is cerebral edema.
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heavy vechicle have back wheels in pairs. why
because without the extra wheels the vehicle would be to heavy and not be able to support the extra weight thus the vehicle would be useless hope this helped brainlies plz
Potential energy is based on an objects
A)gravity
B)mass
C)position
D)kinetic
Answer:
c
Explanation:
because potential energy is created with the position of a body when you pick up something the thing will have stored energy which is transferred from you so the stored energy is potential energy created by the position of a body that when you see over your head you scared of that thing not to bit you because it has stored energy if you see the thing already failed on the ground you wouldn't scared of that because the enery is already gone
Hope help you
Briefly explain why sulfur and phosphorus can form complicated molecules, but nonmetals in period 2 tend to form only diatomic molecules
Answer:
see below
Explanation:
Sulfur and phosphorous can violate the octet rule and have an expanded octet, so molecules of these elements can contain more than eight valence electrons. In contrast, nonmetal elements in period 2 can't have an expanded octet because they don't have d orbitals. These elements must obey the octet rule and can hold only up to eight valence electrons. Period 2 elements can fill their outer orbitals by covalently bonding with one other atom of the same element.
Describe how the organelles in a cell work together to keep an organism alive
Answer:
These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA. ... All of the cell's organelles must work together to keep the cell healthy.
Explanation:
These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA. ... All of the cell's organelles must work together to keep the cell healthy.
Name the intermolecular force in the compound N = O
Molecules are
Group of answer choices
2 elements bound together
2 atoms bound together
2 or more atoms mixed together
2 or more atoms bound together
What is the name of the process that plants and animals undergo to release carbon
imagine you have four food dyes to test A, B, C and D imagine that you are going to investigate which food dye diffuses more quickly a- which variable will you change? b- which variable will you measure? how will you do this?
Answer:
You will change which food dye is used. You will measure how quickly the dyes diffuse. You could use a timer to see how long the dye takes to completely diffuse.
The information regarding the change in the variable should be described below:
The following information should be considered:
You will change the food dye is used. You will measure how quickly the dyes diffuse. You could use a timer for watching how long the dye takes to completely diffuse.Learn more: https://brainly.com/question/4626564?referrer=searchResults
It is 1,518 miles from West Lafayette to Provo, UT (where Mrs. Fernandez started in college). If I drive in that direction 692 miles the first day and 674 miles the second day, how many more miles will I have to drive the third day until I reach my destination? Explain. *
Answer:
152 more miles you will have to drive the third day to reach the destination.
Explanation:
First you must know the distance during the first two days. If you drive 692 miles on the first day and 674 miles on the second day, to get the distance traveled on both days you must add both amounts traveled:
692 miles + 674 miles= 1,366 miles
Knowing that there are 1,518 miles from West Lafayette to Provo, UT, to know the number of miles you will have to drive on the third day to reach your destination, you must subtract between the total distance and the distance traveled in the first two days. This is:
1,518 miles - 1,366 miles= 152 miles
152 more miles you will have to drive the third day to reach the destination.
How is carbon dioxide different than the other types of matter
Which of the four following items are made up of one or more molecules?
Group of answer choices
Salt
Neon
Hydrogen
Gold
How do nicotine and tobacco cause cancer?
Answer:
by damaging or changing a cell's DNA
Explanation:
determine the energy in joules of a photon whose frequency is 3.55 x10^17 hz( with units)
i think it is this
Explanation:
Please solve number 5!! I’ll mark most brainliest!
Answer: 5.248
Explanation: 0.53/0.1010 = 5.24752475248, and round to the thousandths.
When we discuss communication, we often first think of written and oral communication. Write one paragraph about a time when you found it easier to communicate with a graph than with text.
Answer:
There's a lot of answers.
Explanation:
Last year, I presented a paper on population growth in the United States between the years 1975 and 2015. The data involved numbers and figures. This data was difficult to present in textual format, so I turned to graphing. The graph helped me break down and simplify complex numerical data so my audience could more easily understand it.
A time when I found it easier to communicate with a graph than with text was when I wanted to make a presentation about the importance of education.
Communication simply means sending a message from one person to another person. Graphs can be used when one wants to make a visual representation of data.
I used graphs when I wanted to make a presentation about the importance of education. I wanted to show the audience how certain regions like the European countries are well developed than African countries. The graph was vital in visualizing this.
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Is 200 meters greater than 2000 centimeters
Answer:
200 meters.
Explanation:
2000 centimeters is 20 meters
100 centimeters = 1 meter
2000 divided by 100 = 20
Explanation:
Yes, 200 meters is greater than 2000 centimetres . Because 2000 centimetres is only 20 meters . So, 200 meters is greater.If you like this answer then mark this answer as BRAINLIEST answer.
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your my babygirl my love for i will always have te7277sc0309 or if i don't then nothing at all would be as important to me as you are
Answer:
uhm-
Explanation:
chile, anyways so-
how much is 3.5 gallons in cups
Answer:
3.6 gallons are equal to 56 cups
two atoms With diferent mass number but the same atomic number are called
Answer:
they are called isotopes
Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?
Answer:
A. The temperature is always lower.
Explanation:
Just took the test on Edg. 2020
Give me branliest please
what are 3 examples of pairs of atoms with nonpolar covalent bonds?
Answer:
Carbon dioxide - CO.
Benzene - C6H.
Carbon tetrachloride - CCl.
Methane - CH.
Ethylene - C2H.
Explanation: Some examples of atoms with nonpolar convalent bonds. Hope this was found useful!!
Non polar covalent compounds have no net dipole moment due to charge separation. Some examples are, CO₂, H₂, N₂,O₂ etc.
What are covalent compounds?Covalent bonds are formed by the sharing electrons between atoms. Covalent bond is comparatively weaker than ionic bonds. Atoms of deficient number of electrons will combine by sharing their valence electrons and forms covalent bonds.
When one atom has more electronegativity, then the shared pair of electrons will attracted into the electronegative atom. This creates a charge separation and a dipole moment.
However, if the electronegative atoms are linear in geometry from the central less electronegative atom then the dipole moment cancel each other and the compound become non polar as in the case of CO₂.
All gases in molecular states are covalently bonded and are non polar such as H₂, N₂,O₂ etc.
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The molar absorptivity of a compound at 500 nm wavelength is 252 M-1cm-1. Suppose one prepares a solution by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution. What would be the absorbance in a 3 .00 mm pathlength cell?
Answer:
The absorbance of the solution is 0.21168.
Explanation:
Given that,
Wavelength = 500 nm
Molar absorptivity = 252 M⁻¹ cm⁻¹
Number of moles = 0.00140
Volume of solution = 500.0 mL
Length = 3.00 mm
We need to calculate the molar concentration
Using formula of the molar concentration
[tex]C=\dfrac{N}{V}[/tex]
Where, N = number of moles
V = volume
Put the value into the formula
[tex]C=\dfrac{0.00140}{0.5000}[/tex]
[tex]C=0.0028\ M[/tex]
We need to calculate the absorbance of the solution
Using formula of absorbance
[tex]A=\epsilon C l[/tex]
Put the value into the formula
[tex]A=252\times0.0028\times0.300[/tex]
[tex]A=0.21168[/tex]
Hence, The absorbance of the solution is 0.21168.
The absorbance of a compound, with a molar absorptivity at 500 nm wavelength of 252 M⁻¹ cm⁻¹, prepared by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution, measured in a 3 .00 mm pathlength cell, is 0.212.
First, we will calculate the molarity of the compound, which is equal to the moles of solute divided by the liters of solution.
[tex]M = \frac{0.00140mol}{0.5000L} = 0.00280 M[/tex]
Then, we will convert 3.00 mm to cm using the conversion factor 1 cm = 10 mm.
[tex]3.00 mm \times \frac{1cm}{10mm} = 0.300 cm[/tex]
Finally, we will calculate the absorbance of the compound using the Beer–Lambert equation.
[tex]A = \epsilon \times b \times C[/tex]
where,
A: absorbanceε: molar absorptivityb: length of light pathC: molar concentration[tex]A = \epsilon \times b \times C = \frac{252}{M.cm} \times 0.300 cm \times 0.00280 M = 0.212[/tex]
The absorbance of a compound, with a molar absorptivity at 500 nm wavelength of 252 M⁻¹ cm⁻¹, prepared by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution, measured in a 3 .00 mm pathlength cell, is 0.212.
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A 5.0-L sample of sulfur hexafluoride (SF6) is stored at a temperature of 250.0 K and a pressure of 67.0 Pa. If the pressure is decreased to 60.0 Pa, what will the new temperature be?
Answer:279.1 K
Explanation:
You'll be using Gay-Lussac's Law for this. P1/T1=P2/T2
I have a class for this, and one of the practice questions was formatted this way, so I used that format and substituted said numbers as needed
P1:67 Pa
P2:60 Pa
T1:250 K
T2:?
I really hope this helps!
Plz help, have a quiz on this plz PLZ
Answer:
20.82
Explanation:
what is the process called when the moon begins to fade from a full moon to a new moon
Answer:
It's called moon phase
Explanation:
hope this helps