Answer:
study....................
Explanation:
1.Short sessions
2.Sleep well
3.Set goal
4Aim to learn as if you were to teach
4. Light-years are used to measure distances in space. What does it mean when two stars are 150 light-
years apart?
A. The stars are 150 million kilometers from each other.
B. One of the stars formed 150 years before the other star.
C. It takes 150 years for light to travel from one star to the other.
D. It would take 150 years for a spaceship to travel between the stars.
Answer:
C
Explanation:
the answer is C because that's what light year means
Answer:
The units used to measure stellar distance are the light-year, the distance light travels in 1 year, and the parsec (pc), the distance of a star with a parallax of 1 arcsecond (1 parsec = 3.26 light-years). The closest star, a red dwarf, is over 1 parsec away.
Explanation:
L'atomo è composto da protoni,neutroni ed elettroni
Match its item to its best description
accretion disk- does not spin
solar system- a central star with planets around it
solar nebula- may form after a supernova
Hope this helps!!
Which of the following best helps to explain why the electron affinity of Br has a greater magnitude than that of I?
Br has a lower electronegativity than I does.
Answer A: B r has a lower electronegativity than I does.
A
Br has a lower ionization energy than I does.
Answer B: B r has a lower ionization energy than I does.
B
An added electron would go into a new shell in Br but not in I.
Answer C: An added electron would go into a new shell in B r but not in I .
C
There is a greater attraction between an added electron and the nucleus in Br than in I.
The reason why Br has a greater magnitude of electron affinity than that of I is that there is a greater attraction between an added electron and the nucleus in Br than in I.
In the periodic table, there are trends that increase down the group and across the period. Electron affinity is a trend that increases across the period but decreases down the group.
Recall that the ability of an atom to accept an electron depends on the size of the atom. The smaller the atom, the greater the attraction between an added electron and the nucleus.
Since Br is smaller than I, there is a greater attraction between an added electron and the nucleus in Br than in I which explains why Br has a greater magnitude of electron affinity than I.
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The Law of Conservation of Energy states that energy cannot be created or _____.
Question 1 options:
destroyed
enlarged
changed
broken
Answer:
Destroyed.
Explanation:
The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.
Marcar la alternativa correcta en relación a desplazamiento y la distancia
Answer A
Explanation:
Determine the formal charge on each atom in the structure.
The formal charge of an ion in a compound can be find out from the number of bonds, valence electrons and nonbonding electrons. The charge of single bonded oxygens is -1 and that of double bonded oxygen is 0. The formal charge of P is zero.
What is formal charge?Formal charge of an ion is the charge it carries in one formula unit of a compound. It can be find out using the formula as follows:
Formal charge = number of valence electrons - number of non bonding electrons - bonding electrons/2.
Here, oxygen has 6 valence electrons and 2 and 6 nonbonded electron in a single bond. Number of bonded electron is 2 .
formal charge = 6 - 6-2/2 = -1.
The formal charge of double bonded oxygen = 6 - 4 - 4/2 = 0
The valence electrons in phosphorus is 5 and there is non non bonded electrons in it and the number of bonded electrons is 10.
Formal charge = 5 - 0 - 10/2 = 0.
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If 10.0 g of MgSO4⋅7H2O is thoroughly heated, what mass of anhydrous magnesium sulfate will remain?
If 10.0 g of MgSO4⋅7H2O is thoroughly heated, the mass of anhydrous magnesium sulfate will remain is 4.88 grams.
What is mass?Mass is the unit that quantify the matter in a physical body.
The molar mass of the MgSO4⋅7H2O is 246.47 grams.
When magnesium sulfate is heated, the molar mass of magnesium sulfate become 120.36 g/mol
Now, both molar masses are divide and multiplied by 10
[tex]\dfrac{120.36 g/mol}{246.47} \times 10 = 4.88 g.[/tex]
Thus, the mass of anhydrous magnesium sulfate will remain is 4.88 grams.
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Which group has eight valence electrons?
alkaline earth metals
alkali metals
halogens
noble gases
Answer:
alkali metals is your answer
Answer:
alkali metals
Explanation:
Question 4 of 10
What is gravitational potential energy?
A. Energy stored in atoms
B. Energy from light
C. Energy of motion
ОО
D. Energy stored in height differences
SUBMIT
Answer:
c
Explanation:
because of the law of gravity
Which describes why liquid moves through a straw?
A. The straw allows a method of escape for the liquid in the glass.
B. The liquid inside the straw has a higher pressure than the air outside, so it draws the air in.
C. The air pressure creates a vacuum in the straw that pulls the air into the liquid.
D. The atmosphere pushes down on the liquid in the glass causing it to rise in the straw.
Answer:
C.
The air pressure creates a vacuum in the straw that pulls the air into the liquid.
1. When CO2 (s) sublimes, there is a change in the
A) bond type
B) gram-formula mass
C) molecular polarity
D) particle arrangement
Answer:
D)Particle Arrangement
Explanation:
When solid carbon dioxide CO₂ will evaporate in gaseous carbon dioxide CO₂ the particles arrangement will change from ordered in solid state to completely disordered in gaseous state.
Bond type, gram formula mass and molecular polarity are not changed in the described physical transformation.
starting with 500.4 of glucose, what is the maximum amount of ethanol in grams and i'm liters that can be obtained by this process( density of ethanol=0.789 g/mL
Please help it's due today
Answer:
.
Explanation: man that's okay
Explain mole concept using any real life example
Answer:
for instance :
water , H²O , and hydrogen peroxide . H²O² , are alike
in that their respective molecules are composed of hydrogen and oxygen atomd . hope its helpful . Good luck :)
Suggest an alternative to zinc oxide that could react with hydrochloric acid to give you the desirable product.
Answer:
maybe all the basic oxide i guess
Explanation:
cuo + hcl -> cucl2 + h20
...
The reaction of zinc oxide with hydrochloric acid is as follows:
[tex]ZnO + 2HCl[/tex] → [tex]ZnCl_2+ H_2O[/tex]. What type of reaction is this?The reaction of zinc chloride with hydrochloric acid represents an example of a neutralization reaction. This reaction significantly forms zinc chloride which is a salt and water.
According to the context of this question, the desired product of the given reaction forms the salt. In this reaction, zinc oxide acts as a base while hydrochloric acid is the strongest acid.
When acid reacts with bases, the product formed is called a salt, so zinc chloride is a salt. This is because it is one of the characteristic properties of acid.
Therefore, the desired product of the reaction of zinc oxide with hydrochloric acid is well described above.
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“optical fibers can provide people with natural sunlight for free, but what are some disadvantages to using optical fibers to light a room with sunlight?”
Answer:
the UV exposure is my guess
La reacción para la neutralización del antiácido es:
Answer:
Magnesium hydroxide Mg(OH)2 Mg(OH)2(s) + 2 HCl(aq) -----> MgCl2(aq) + 2 H2O(l)
Explanation:
pcl5>pcl3+cl2
phản ứng xảy ra 25
Answer:Ra 15
Explanation: cL2>pc13
Atoms will ___ electrons so each atom involved will have a Bible gas configuration.
Answer:
Explanation:
where anwser
Lab Report
Plasma Membrane
It’s time to complete your Lab Report. Save the lab to your computer with the correct unit number, lab name, and your name at the end of the file name (e.g., U2_ Lab_PlasmaMembrane_Alice_Jones.doc).
Introduction
What was the purpose of the experiment?
To experiment with and learn about the plasma membrane.
What were the independent, dependent, and control variables in your investigation? Describe the variables used in the part of the experiment with the eggs.
Type your answer here:
Write a hypothesis based on observations and scientific principles.
Type your answer here:
Experimental Methods
What tools did you use to collect your data?
Type your answer here:
Write your procedure. List each step so that another student could follow the procedure and repeat your experiment.
Type your answer h
Answer:
I know some of them...
Explanation:
1. What was the purpose of the experiment?
Type your answer here: The purpose of this experiment is to show that a cell membrane is a type of barrier, and is permeable to some substances, but may not be permeable to all substances.
2. What were the independent, dependent, and control variables in your investigation? Describe the variables used in the part of the experiment with the eggs.
Type your answer here: Independent variable / Manipulated variable: Refers to all the variables in an experiment that provoke a response in another variable. This variable is modified during the experiment to analyze how another variable responds to it. The researcher wants to study how the changes in these variables affect the dependent variable. The researcher can change these variables to see what changes it implies in an object, process, trait, or anything that depends on them.
Dependent variable / Responding variable: Its response depends on any change in the independent variable. The dependent variable is the one that is being investigated, studied, and measured. It represents a quantity of something which value depends on how the independent variable is modified. It is usually identified by the letter Y. A change in the dependent variable might be proportional or inversely proportional to the change in the manipulated variable. In the exposed example, the dependent variable is the egg circumference.
Constants / Controlled variables: Refers to those variables in an experiment that are controlled and have no influence on the results. These variables do not affect the change in the dependent variable values. In the exposed example the use of the lid to seal the jar and the amount and concentration of vinegar might be considered as a controlled variable. These elements are used but do not provoke any change in the size of the egg.
thats it... CAN SOMEONE ANSWER THE OTHERS?! I NEED ITT
what is the difference between a diatomic element and a compound
Diatomic
consist of two atoms bonded together. In contrast, monatomic elements consist of single atoms (e.g., Ar, He). Many compounds are diatomic, such as HCl, NaCl, and KBr. Diatomic compounds consist of two different elements. There are seven pure elements that form diatomic molecules.
Key Takeaways: Diatomic Elements
Diatomic elements are pure elements that form molecules consisting of two atoms bonded together.
There are seven diatomic elements: hydrogen, nitrogen, oxygen, fluorine, chlorine, iodine, bromine.
These elements can exist in pure form in other arrangements. For example, oxygen can exist as the triatomic molecule, ozone.
This is a list of the seven diatomic elements. The seven diatomic elements are:
Hydrogen (H2)
Nitrogen (N2)
Oxygen (O2)
Fluorine (F2)
Chlorine (Cl2)
Iodine (I2)
Bromine (Br2)
All of these elements are nonmetals, since the halogens are a special type of nonmetallic element. Bromine is a liquid at room temperature, while the other elements all gases under ordinary conditions. As the temperature is lowered or pressure is increased, the other elements become diatomic liquids.
Astatine (atomic number 85, symbol At) and tennessine (atomic number 117, symbol Ts) are also in the halogen group and may form diatomic molecules. However, some scientists predict tennessine may behave more like a noble gas.
While only these seven elements routinely form diatomic molecules, other elements can form them. However, diatomic molecules formed by other elements are not very stable, so their bonds are easily broken.
compounds
are formed by the chemical combination of two or more element. example water is a compound because two elements water and hydrogen come to form it.
determine the volume of liquid in each graduated cylinders.
what does the graphs look like? PLEASE HELP!! LOTS OF POINTS!!
Answer:
why is it asked in the chemistry isnt it maths question though
According to the excerpt from Nature News above, how are the processes in the water
cycle related to the strength and severity of hurricanes like Katrina in 2005?
Answer:
Because it is!
Explanation:
Hurricanes was the one of the big natural disaster . Yes, it was true and it is in the book of mythology.
What made hurricanes Katrina so powerful ?It was so destructive primarily because levees around New Orleans, Louisiana failed. Levees are water barriers built to prevent flooding (parts of New Orleans have an elevation that is lower than sea level). When the levees failed, huge areas of the cities flooded.
Water is in constant motion, moving from the ocean to the sky to the earth. Flooding is a natural event which occurs when water overflows a stream, river or drain. Floods are caused by rainfall, melting snow or ice, or by the failure of structures such as dams.
There are main four parts of water cycle . i.e. evaporation , convection , precipitation and - collection.
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What is the mass of 3.35 mol Hg(IO3)2?
The value of mass of [tex]Hg(IO_3)_2[/tex] is 1843.84 g.
Given:-
Molar mass of [tex]Hg(IO_3)_2=550.40\ g/mol[/tex]
number of mole=3.35 mol
Formula for the calculation of mass of [tex]Hg(IO_3)_2[/tex] is as follows:-
[tex]Number\ of\ mole=\frac{Mass}{Molarmass}[/tex]
Substitute 550.40 g/mol for molar mass, and 3.35 for number of mole in the above equation:-
[tex]3.35\ mol=\frac{mass}{550.40\ g/mol} \\Mass=3.35\ mol\times550.40\ g/mol\\=1843.84\ g[/tex]
Hence, the value of mass of [tex]Hg(IO_3)_2[/tex] is 1843.84 g.
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what happened to the empty can that force are acting on it
Answer:
The empty can will fall when there is a light force and when there is a hard force, the empty can would be crushed.
A tank of hydrogen gas has a volume of 22.9L and hold 12 mol of gas at 12°C what is the pressure of the gas in atmospheres?
Answer:
P = 14.3 atm
Explanation:
PV = nRT
T = 12 C + 273 = 285K
P = nRT/V
P = 14.0 mol H(0.08205 L * atm/mol * K)(285 K) / 22.9 K
mol, L, and K cancels out
P = 14.3 atm
A particular beer is 6.50 % ethanol by volume . If a single bottle of beer contains a total of 750.0 mL of beer, what volume, in mL of ethanol (C2H6O), are present in the bottle?
This question involves the simple concept of percent by volume in a solution.
The volume of ethanol present in the bottle is found to be "48.75 ml".
The percent by volume of a solution means the amount of that substance present in the solution, represented as a fraction of the total volume of the solution. Hence, the volume of ethanol present in the bear can be found by using the following formula:
[tex]Percent\ by\ Volume\ of\ Ethanol = \frac{Volume\ of Ehanol}{Total\ Volume\ of\ Beer}(100\ \%)\\\\6.50\ \% = \frac{V}{750\ mL}(100\ \%)\\\\V = \frac{(6.50\ \%)(750\ mL)}{100\ \%}[/tex]
V = 48.75 mL
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Which is the best explanation for a convection current in the atmosphere?
Question 4 options:
Hot air expands and rises to the top of the atmosphere, while the cool air stays below it.
Hot air expands and rises, becoming cooler and denser, then falling again in a continuous process
Cold air expands and rises, becoming warmer and contracting, then falling again in a continuous cycle.
Cold light air rises in the atmosphere, while the warmer air stays near the ground.
Hot air expands and rises, becoming cooler and denser, then falling again in a continuous process
The convection current in the atmosphere is best explained as the process by which hot air expands and rises, becoming cooler and denser, then falling again in a continuous process.
Heat transfer by convection involves the transfer of heat by the actual movement of the heated molecules from the hot parts to the cooler parts of a fluid.
The continuous movement of hot air or liquid from bottom to the top and cold liquid or air from the top to the bottom is known as convection current.
Thus, we can conclude that convection current in the atmosphere is best explained as the process by which hot air expands and rises, becoming cooler and denser, then falling again in a continuous process.
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