Answer:
hhhhh
Explanation:
jsjsjdjddfrtttrjsjjdhhdhfhhfhfhhrheidjhf
Please help me with chem, it would be very appreciated!
why it is necessary to draw a Lewis diagram before predicting the shape of a molecule
To determine the shapes of molecules, we must become acquainted with the Lewis electron dot structure. Although the Lewis theory does not determine the shapes of molecules, it is the first step in predicting shapes of molecules. The Lewis structure helps us identify the bond pairs and the lone pairs.
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Salt is added to water at room temperature, and the solution remains at room temperature. Which of the following does not apply to the more concentrated salt solution?
Select one:
a. It has a higher boiling point than water.
b. It has a greater electrical conductivity than water.
c. It has a lower freezing point than water.
d. The salt absorbs energy from the water.
Answer:
A
Explanation:
The figure above shows two closed containers. Each contains the same volume of acetone in equilibrium with its
Yanar at the same temperature. The vapor pressure of the acetone is
The vapor pressure of a liquid and the prevailing atmospheric pressure,
determines the boiling point temperature.
The vapor pressure of the acetone is the same in both containers because
the temperature is the same.
Reasons:
The vapor pressure of a liquid is the pressure at which the number of
molecules entering the gaseous phase are in (dynamic) equilibrium with
the number of molecules entering the liquid phase.
The factors that affect vapor pressure are;
The type of molecules that make up the liquid or solidThe temperature of the liquid or solidChanging the surface area changes the instantaneous concentration of
molecules of vapor above the liquid, however, an equilibrium vapor
pressure is reached with time as more molecules enter or exits the liquid
(or solid) due being over or under saturated.
Therefore, the surface area of the liquid has no effect on a liquid's vapor
pressure therefore;
The vapor pressure in both containers will be the same because the temperature is the same.
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which physical quantity is not used when determining the stoichiometry in this experiment?
The physical quantity that is not used when determining the stoichiometry in this experiment is temperature.
Stoichiometry offers a way in which we can calculate the amount of reactants and products using mass - mole relationship. The mass of reactants, number of moles of reactant, mass of product and mass of precipitate can all be used to determine the stoichiometry.
However, the temperature of a reaction is not used to determine the stoichiometry of the reaction.
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Which physical quantity is NOT used when determining the stoichiometry in this experiment?
mass of precipitate mass of product moles of reactant temperatureKim loại đòng sắt đc tạo từ nguyên tố nào
Answer:
sup brö how is it back home?
Explanation:
just curious you know
If 83.6 grams of H2 and 257 grams of N2 react, how many grams of ammonia will be produced?
The mass of ammonia that would be produced is 312.5 g
First, we will write a balanced chemical equation for the reaction
The balanced chemical equation for the reaction is
3H₂(g) + N₂(g) → 2NH₃(g)
This means
3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia.
First, we will determine the number of moles of each reactant present
For Hydrogen (H₂)
Mass = 83.6 g
Molar mass = 2.016 g/mol
Using the formula
[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]
Number of moles of H₂ present = [tex]\frac{83.6}{2.016}[/tex]
∴ Number of moles of H₂ present = 41.468254 moles
For Nitrogen (N₂)
Mass = 257 grams
Molar mass = 28.0134 g/mol
∴ Number of moles of N₂ present = [tex]\frac{257}{28.0134}[/tex]
Number of moles of N₂ present = 9.174181 moles
Since,
3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia
Then,
27.522543 moles of hydrogen gas will react with the 9.174181 moles of nitrogen gas to produce 18.348362 moles of ammonia
∴ 18.348362 moles of ammonia will be produced during the reaction
Now, for the mass of ammonia that would be produced
From the formula
Mass = Number of moles × Molar mass
Molar mass of ammonia = 17.031 g/mol
Mass of ammonia that would be produced = 18.348362 × 17.031
Mass of ammonia that would be produced = 312.49095 g
Mass of ammonia that would be produced ≅ 312.5 g
Hence, the mass of ammonia that would be produced is 312.5 g
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Answer:
it is c greenhouse effect please mark me brainliest
Explanation:
Answer:
green house effect
Explanation:
The answer is green house effect.
Read the statements. In eukaryotic organisms, genes usually consist of two alleles. The two alleles are often on different parts of the same chromosome.
These sentences contain incorrect information. Which option describes the mistake?
○ In Eukaryotic organisms, the two alleles of the gene are on different chromosomes.
○ in eukaryotic organisms, genes are usually spread over four or more chromosomes,
○ In eukaryotic organisms, genes usually consist of a single allele.
○ In eukaryotic organisms, the two alleles of the gene are joined end to end on the same chromosome.
Answer:
I think its B but im not too sure
A valence electron is
a) any electron in the highest energy level of an atom
b) the electron closest to the nucleus of an atom
c) any electron that does not take part in chemical bonding
d) the electron that is gained when a cation is formed
in which step of the scientific method do we want to use graphs
Explanation:
The next step in the scientific method is to analyze the data. Data analysis is the process of interpreting the meaning of the data we have collected, organized, and displayed in the form of a table or graph.
Q4. What are the different ways in which human being use rocks ?
Answer:
To hit someone on the head
Explanation:
self protection
Why do humans have a tailbone? What could it tell us about our past?
Answer:
Monkey have tail we come from monkey
Answer:
The coccyx, or tailbone, is the remnant of a lost tail. ... The coccyx serves as an attachment site for tendons, ligaments, and muscles. Tailbones helped our ancestors with mobility and balance
Explanation:
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what is the electron configuration of uranium at its ground state (in order) AND noble gas configuration?
Answer: Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. The chemical symbol for Uranium is U. Electron configuration of Uranium is [Rn] 5f3 6d1 7s2. Possible oxidation states are +3,4,5,6.
Explanation:
Answer:
Electron configuration of uranium at its ground state: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6s6 5f3 6d1 7s2
Noble gas configuration: [Rn] 5f3 6d1 7s2.
Which chemical family below would the element iodine most likely belong to?
Family D
Family C
Family A
Family B
Answer:
it is option A
Explanation:
Best of luck in whatever you are doing
Which option correctly describes the pattern of valence electrons on the periodic table? (1 point)
o The number of valence electrons increases from right to left.
O The number of valence electrons increases from left to right.
O The number of valence electrons increases from bottom to top.
O The number of valence electrons increases from top to bottom.
Answer:
The number of valence electrons increases from left to right.
Explanation: The number of valence electrons increases going across a period, or row in the periodic table, for example, group 1 elements have 1 valence electrons and group 2 elements have have 2.
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Answer:
i think the answer is C
Explanation:
if wrong im sorry
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Relate how a household sponge and water can be used to model
the concept of an unsaturated solution, a saturated solution, and a supersaturated
solution.
The sponge is unsaturated when it is taking in more water. It becomes saturated when it stops taking in water. It is supersaturated when water starts oozing out from the sponge.
A saturated solution contains just as much solute as it normally hold at a particular temperature. An unsaturated solution contains less solute than it can normally hold at a particular temperature. A supersaturated solution contains more solute than it can normally hold at a particular temperature.
We can use a sponge to model these three scenario as follows;
Water continues to enter into the sponge when it is unsaturated, this continues until the sponge becomes saturated with water and takes in no more water. When the sponge becomes supersaturated, water begins to ooze out from the sponge because it can no longer hold more water.
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which scientist also arranged the elements by increasing atomic mass and used the pattern to predict the existence of elements yet to be discovered?
Discussion Question: Your classmate said,
"I think Gold is a pure substance that can't be broken down any further
Do you agree or disagree with this statement. Explain your reasoning using clues from the statement and the periodic
table.
Answer:
yes gold is pure
Explanation:
carbon cycle carbon cycle
Hope you could get an idea from here.
Doubt clarification - use comment section.
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Answer:
B I and II
Explanation:
warming and melting.
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how would the rate of diffusion change if the po2 in the capillaries was 40 mmhg and the po2 in the muscle cell changed from 40 to 20 mmhg?
The rate of diffusion change would increase if the PO₂ in the capillaries was 40 mmHg and the PO₂ in the muscle cell changed from 40 to 20 mmHg.
Simple diffusion is the movement of molecular substances from a region of higher concentration to lower concentration. The mechanism with which the movement of O₂ travels from the blood to the body tissues takes place with the use of simple diffusion.
Now, if PO₂ changes from 40 → 20 mmHg in the muscle cells, and the PO₂ in the blood = 40mmHg. It implies that the pressure gradient(P) has increased. As such, there is an increase in the rate of diffusion of oxygen from the blood to muscle cells.
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In the fall, how does the high pressure area
affect the hurricane?
Answer:
Hurricanes occur when ocean water warms during the spring, summer and early fall.
Explanation:
Warm air just above the water’s surface rises. The rising warm air creates a reduction in pressure at the surface, what meteorologists call a low-pressure area. Because nearby air is at a higher pressure, it will flow into the low-pressure zone.
https://www.sidmartinbio.org/how-does-a-high-pressure-system-affect-a-hurricane/
Which of the following is an example of chemical energy being used?
(A) Battery in a flashlight
(B) Ice melting
(C) Riding a bicycle
(D) Mercury rising in a thermometer
Answer:
(A) Battery in a flashlight
Explanation:
Because the chemicals in the battery are being converted to light and heat energy from the bulb!
Answer: D
Explanatione: I hope this helped :)
Was arsenic able to replace Phosphorus in DNA?
Answer:
Arsenic-tolerant GFAJ-1 bacteria were reported to have replaced some of the phosphorus (P) in their DNA with arsenic. ... These bacterial cells were very efficient at using the small amount of available phosphate in preference over the easily available arsenic. so yes.
Explanation:
hope this helps
Answer:
Yes
Explanation:
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what is the wavelength of microwaves if the frequency is 2.45x 10^9 HZ?
Wavelength = Speed of Light ÷ Frequency
= (2.99 × 10⁸ m/s) ÷ ( 2.45 × 10⁹ /s)
= 1.22 × 10⁻¹ m
The wavelength of a light of frequency 2.45 × 10⁹ /s is 1.22 × 10⁻¹ m.
Notes:
Hz ≡ /s
A machine increase the rate of doing ______.
Sharp instruments are called ______.
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solutions of barium bromide and sodium phosphate combine to form solid barium phosphate and aqueous sodium bromide. true or false?
Answer:
The Answer Is False
Explanation:
I Just Think Thats The Answer
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Answer:
It is true answer. Ozone = O3
An element is composed of one type of atom with its own unique properties. TRUE OR FALSE
Answer:
It's true
Hope it helps:-)
Answer:
true
Explanation:
