Answer: 760 mm
Explanation:
At sea level, a mercury column will rise a distance of 760 mm. At higher altitudes, the atmospheric pressure is decreased and so the column of mercury will not rise as high.
What describes a chemical reaction?
Answer:
A chemical reaction is a process where two different substances or elements are mixed together. They then undergo some sort of chemical change to become a different substance altogether.
Explanation:
What is the SI base unit of temperature?
Answer:
Kelvin
Explanation:
21. When considering the Bohr model of a neon atom, which of the following is a true statement?
Ten protons would be located in the nucleus, and 10 neutrons would be on the outside of the atom orbiting in rings.
Ten protons would be located in the nucleus, and 10 electrons would be on the outside of the atom orbiting in rings.
O Ten protons would be located in the nucleus, and 20 neutrons would be on the outside of the atom orbiting in rings.
OTwenty protons would be located in the nucleus, and 10 electrons would be on the outside of the atom orbiting in rings.
The characteristics of the Bohr model allow you to find that the correct answer for the distribution of particles in the atom is:
b) Ten protons would be located in the nucleus, and 10 electrons would be on the outside of the atom orbiting in rings.
The bohr model was initially developed for hydrogen, where it manages to fully explain the spectrum of the hydrogen atom, it was quickly spread to other multi-electronic atoms with the characteristic of having a single electron in their last orbit.
The extension to atoms with more than one electron in the last shell the model results are not completely correct.
The Bohr model uses Rutherford's knowledge that the atomic nucleus is a very small part of an atom that contains all its mass, that is, it contains the protons and neutrons and the electrons are in circular orbits around the nucleus.
In the case presented of Neon, its electronic configuration is
1s² 2s² 2p⁶
Let's examine the different claims:
a) False. Protons and neutrons form the mass of the atom, therefore they are both in the nucleus.
b) True. The protons are in the nucleus and the electrons are in circular orbits.
c) False. All protons and neutrons must be in the nucleus, plus neon only has 10 neutrons.
c) False. The number of protons determines the type of atom. An atom with twenty protons is Calcium atom .
In conclusion, using the characteristics of the Bohr model we can find that the correct answer for the distribution of particles in the atom is:
b) Ten protons would be located in the nucleus, and 10 electrons would be on the outside of the atom orbiting in rings.
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calculate the kinetic energy of a baseball (mass = 5.25 oz) with a velocity of 1.0 x 10^2 mi/h
Answer:
262.5 Joules
Explanation:
You find the kinetic energy of multiplying half of the mass by the velocity. In this word problem it tells you the mass so you divide it by 2. That answer is 2.625, you then multiply that by the velocity, in this instance it's 1.0 x 10^2 mi/h.
The unit in kinetic energy is Joules. This is actually a really important part in chemistry and physics.
The kinetic energy of a baseball (mass = 5.25 oz) with a velocity of 1.0×10² mi/h is 147.88 joules.
How do we calculate kinetic energy?Kinetic energy of any object will be calculated by using the below equation:
K.E. = 1/2(mv)², where
m = mass of object in kg = 5.25 oz = 0.148 kg
v = velocity in m/sec = 1.0×10² mi/h = 160934 m/h = 44.704 m/s
On putting values on the above equation, we get
K.E. =1/2(0.148)(44.704)²
K.E. = 147.88 joules
Hence required kinetic enrgy is 147.88 joules.
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NO LINKS PLS HELP I WILL MARK THE BRAINIEST ANSWER
Answer:
Option a
Explanation:
simple
Answer:
The two solutions do not react with each other unless the water is boiled off, then the two will decompose.
Explanation:
Where do most metabolic reactions occur?
all of the above
O plasma membranes
O nucleus
O cytoplasm
Answer:
CYTOPLASM
Explanation:
MOST REACTION REQUIRE WATER TO OCCUR
SINCE ENZYME WORK BEST WHEN DISSOLVED IN WATER
WATER IS PRESENT IN CYTPLASM HENCE IT IS MAIN SITE OF MEABLIC REACTIONS
I need help pleaseeee
PLEASE HELP!!
What kind of metal is Co?
Alkali Metal
Transition Metal
Alkaline Earth Metal
Answer:
I believe Cobalt is a Transition Metal.
Answer:
answer is transition metal
The lower the pressure, the lower a liquid’s boiling point is. Water actually boils much faster at the top of a mountain where air pressure is lower. Without pressure water in the body begins to boil. What do you think will happen to your body as blood, saliva, and other fluids boil?
Answer:
The lower the pressure, the lower a liquid's boiling point is. That's why water boils much faster at the top of a mountain than it does at the bottom. In space, there is no pressure. So the boiling point could easily drop to your body temperature.
mark as a brainlist plz.
Name each compound
NaF
K2CO3
….
why are being flammable and combustible be considered to be chemical properties and not physical properties?
Answer:
Because combustion is a chemical change and not a physical change. Do, flammable and combustible gases burn and change into new substance.
As opposed to a physical change, combustion is a chemical transformation. Combustible and flammable gases do burn and transform into new substances.
What are considered combustible?Combustible materials are those that, when exposed to fire or heat, will ignite, burn, sustain combustion, or produce flammable gases in the form and circumstances anticipated for their application. Combustible materials include rubber, plastics, rubberized materials, and wood.
Are metals combustible?Depending on the environmental factors, most metals are flammable to varied degrees. With water, acids, and other chemicals, certain metals can react in ways that are hazardous. Some metals can spontaneously ignite and heat up.
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Which unit could be used to measure volume?
Need help
Answer:
A
Explanation:
Because it milliliter and litre is used to measure volume not meter or millimeter
who is considered the father of the periodic table
Answer:
Dmitri Mendeleev
Explanation:
6) Which of the following would travel the farthest in column chromatography?
a. CH3CH2CH2COOH
b. C6H6
c. CH3OH
d. C8H18
The answer would be C8H18, or octane. Column chromatography is a separation technique that works off of polarity. The stationary phase, in column chromatography, are non-modified silica gels. Silica gels are normally polar. This means the solvent that will elute first are non-polar molecules...then polar molecules. The polar silica gels have a stronger interaction with polar molecules like CH3OH, and therefore will lag the solvent. Additionally, as you decrease the carbons, in hydrocarbons, the molecule becomes more polar. This is not C6H6 isn't the answer and octane is.
C8H18 will travel the farthest in column chromatography.
Chromatography is know as a process of analyzing and purifying organic compounds.There are different forms of chromatography. there is the column chromatography, Gas chromatography etc.
Alkanes are known to be least polar and as such would travel farthest into the mobile phase of the four functional groups. C8H18 belongs to the alkanes family.
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Which law specifically combines volume, pressure, and temperature only?
Charles's Law
Gay-Lussac's Law
Combined Gas Law
Ideal Gas Law
Answer:
Boyles law
Explanation:
I think that is combined gas law.
Convert 15.0 grams of H2 to molecules of H2.
Why it is important to have balanced charges when forming ionic compounds?
[tex]\textbf{Question:-}[/tex]
Why it is important to have balanced charges when forming ionic compounds?
✿[tex]\textbf{Answer:-}[/tex]
As we know electrons can neither be created not destroyed,instead it can be transferred from one medium to another, therefore it is important to have balanced charges when forming ionic compounds. Net ionic equations must be balanced by both mass and charge. Also, the total number of electrons lost by the cationic species must be same with the total number of electrons gained by the anionic species.✿[tex]\textbf{More to know:-}[/tex]
Ionic Compounds-Ionic compounds are solids and hard due to the strong attracting force between the positive and negative ions. These compounds are generally brittle and break into pieces on application of pressure.Ionic compounds contain positively and negatively charged ions in a ratio that results in an overall charge of zero.why is it necessary to run tlc in a closed container?
Answer:
Explanation:
It is necessary to run TLC in a closed container and have the interior saturated with the solvent vapor to ensure maximum resolution between components and to prevent solvent evaporating off. If the solvent evaporates off, the Rf value would be lower than the expected value.
Which of the following is not involved in bringing materials into cells?
a. endocytosis b. osmosis c. active transport d. exocytosis
Answer:
b
Explanation:
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can somebody please helpppp???
Answer:
aluminum is highly reactive
Answer:
Aluminum is highly reactive
Explanation:
Chemical property is defined as the property in which chemical composition of the substance changes.
For example, reactivity, oxidation state, inflammability etc are all chemical properties.
Therefore, we can conclude that out of the given options, Aluminum is highly reactive depict a chemical property of aluminum.
how do lone pairs of electrons influence the structure of molecules?
Answer:
lone pairs and bonds both repulsive each other
Explanation:
therefore bond angles will be changed that leads to the original geometry in nature
Using a lamp without a shade and a baseball, Juan turned on the lamp and placed it on one side of a darkened room. He sat on the other side of the room and held the baseball between his face and the lamp.
Based on the model, what would the final step of his model?
Answer:b
Explanation:
Pls help!!! for 100 points, please only answer if your actually going to help ! A kitten has a mass of 1582 g and accelerates at 1.7 m/s^2. What is the net force acting upon the kitten?
Write down all the givens from the problem.
Are all of the units in the form required to use the generic equation? If not, then show your conversion.
Write the generic equation (equation with variables only) for this problem. Do not add any spaces between letters or symbols.
Substitute your numbers into the generic equation. This is where you show your math work, step by step. Solve the problem
Enter the numeric portion (numbers only) of your answer here rounded to the nearest tenth.
Enter the numeric portion (numbers only) of your answer here rounded to the nearest tenth.
Answer:
2689.4
Explanation:
24. Predict the ions that form when magnesium(group IIA) and nitrogen (group VA) react::
Magnesium (group IIA) loses two electrons to become a cation. This is the most energetically favorable way for Magnesium to obtain a valence electron that is stable (octet). When an atom loses electrons it has a positive charge that matches the number of electrons lost.
Nitrogen (group VA) gains three electrons to become an anion. This is the most energetically favorable way for Nitrogen to obtain a valence electron that is stable (octet). When an atom gains electrons it has a negative charge that matches the number of electrons gained.
please help :((
Which of the following atoms has the largest radius?
1. Na
2. H
3. Ar
4. P
5. F
6. AI
Learning Task No. 3: Complete the following sentences by filling in the appropri-
Put in order from smallest to largest radii:
1. AI, Na, CI, Ar, Mg
2. S, Te, Po, Se, O
3. Cl, Ca, S, P, Ga, Mg
4. F, CI, Br, I, At
Answer:
1. Ar, Cl, Al, Mg, Na
2. O, S, Se, Te, Po
Explanation:
Just remember the trends. From left to right, atomic radius decreases because proton increases and pulls electrons closer. From top to bottom, atomic radius increases because there are more electron shells.
Which of the following is not a stage of the scientific method?
a. using a hypothesis to sell a new product
b. observing, collecting, and communicating data
c. formulating theories
d. formulating hypotheses
Answer:
Using a hypothesis to sell a new product.
polonium has a large, unstable nucleus. through which process is it most likely to become stable?
Answer:
alpha decay
Explanation:
an unstable element is radioactive in nature.
Polonium is a chemical element with a large, unstable nucleus.
the most stable isotope of Polonium is Polonium-209, which typically undergoes an alpha decay to form lead-205 and the emission of an alpha particle.
1. Polonium has a large, unstable nucleus. Through which process is it most likely to become stable?
alpha decay
2. Which type of energy does alpha decay generate?
kinetic
3. Use the equation to answer the question.
14 6C→14 7N+ 0−1e
Which type of radioactive decay does the equation model?
beta-minus decay
4. How does the nucleus change in beta-plus decay?
The mass number remains the same, and the atomic number decreases by one
5. An unstable nucleus undergoes gamma decay. How does the nucleus change?
It becomes more stable by repositioning its particles
Explanation: I did the test
Explain error and how it can impact your results from an experiment.
Answer:
Random errors will shift each measurement from its true value by a random amount and in a random direction. These will affect reliability (since they're random) but may not affect the overall accuracy of a result.
