Answer:
Standard Temperature and Pressure (STP) is the temperature of 0° C (273 K) and pressure of 1 atm (101.325 kilopascals). (Oxford Science Dictionary)
One mole of any gas has a volume of 22.4 dm³ at this temperature and pressure.
State and explain which measuring cylinder is the best to use?
Answer:
Graduated cylinder
Explanation:
A graduated cylinder is used routinely for measuring volume and is considered more accurate than a beaker because of the permanently-marked incremental graduations incorporated in the clear cylinder.
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the two main division of solid structures are crystalline and what?
Answer:There are two main categories of solids—crystalline solids and amorphous solids. Crystalline solids are those in which the atoms, ions, or molecules that make up the solid exist in a regular, well-defined arrangement.
Explanation:
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Do you think the black moths would have increased population if the Industrial Revolution didn't occur? Explain your reasoning.
Answer:
The dark moths were now better camouflaged. As a result, dark moths had a greater chance of reproducing and passing on the alleles that made them dark. This led to a gradual increase in the proportion of dark moths until light moths became very rare in industrial areas. The moth populations in these areas had evolved.
The evolution of the peppered moth is an evolutionary instance of directional colour change in the moth population as a consequence of air pollution during the Industrial Revolution. The frequency of dark-coloured moths increased at that time, an example of industrial melanism.
why do atoms emit light energy according to the bohr model?
Answer: According to the Bohr model, atoms emit light because excited electrons are returning to lower energy states, emitting the energy difference. This energy always has a specific wavelength because the electrons can only exist in set orbits. ... An emission spectrum is the frequencies of light emitted from an atom.
Explanation:
Atoms emit light energy because electrons transit between energy levels by absorbing energy and relaxing by emission of radiation.
What is Bohr's model of atom?According to Bohr model of atom the electrons are revolving around the nucleus through the circular paths of fixed energies. These circular paths are called orbits.
Using this model the momentum and velocity of an electron and the atomic radius can be determined. Bohr, states the electrons are able to transit between these energy level and the energy difference between the two energy levels will be equal to the energy of a photo absorbed by the atom.
Electrons excite to higher energy level by by absorbing energy and they cant stay there for long while and relax back to the ground state by emitting a the radiation which is complementary wavelength to the absorbed one. That's why the atoms emit light.
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what kind of state is a roller coasters are the best use of Newton's laws of motion
I am slightly unsure on the question, but if you are asking what kind of "statement" is "roller coasters are the best use of Newton's laws of motion" then the following should answer your question:
Answer:
An opinion.
Explanation:
In physics, Sir Isaac Newton's first law of motion is known as law of inertia and it states that, an object or a physical body in motion will continue in its state of motion at continuous velocity (the same speed and direction) or, if at rest, will remain at rest unless acted upon by an external force.
The statement, "Roller coasters are the best use of Newton's laws of motions" is an opinion because it is not based on any evidence, facts, or proof to back it up.
Combustion produces carbon dioxide which is a greenhouse gas
O True
O False
Answer:
true
Explanation:
Carbon dioxide (CO2) makes up the vast majority of greenhouse gas emissions from the sector, but smaller amounts of methane (CH4) and nitrous oxide (N2O) are also emitted. These gases are released during the combustion of fossil fuels, such as coal, oil, and natural gas, to produce electricity.
Multicellular plants and animals have organs with specific functions.
Which structures do eukaryotic cells have for performing specific functions? ASAP!! PEOPLE! PLZ
Answer:
Organelles.
An organelle in a cell is sometimes compared to an organ or organs in organisms.
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Explanation:
C- Na Al wouldnt make sense so it would be either mg or Na but Na has only one electron
An example of a small region that geographers might study is Chinatown
in San Francisco.
Answer: san francisco
Explanation:
Calculate the mass of 1.5 moles of calcium atoms
Answer:As we know that, one mole is equal to the one gram atom which is also equal to the molar mass. Therefore, the mass of 1.5 gram atom of calcium is 60 gram.
Explanation:
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Two raw materials used in the manufacture of polythene
crude oil and natural gas
11) What is the relationship between temperature and the speed of sound? Include the concept of molecule
vibration in your explanation.
Answer:
Temperature is another condition that affects the speed of sound. Heat, like sound, is a form of kinetic energy. Molecules at higher temperatures have more energy and can vibrate faster and allow sound waves to travel more quickly. The speed of sound at room temperature air is 346 meters per second.
If an airplane has parts that function like
a person's parts, then what part of the body does the pilot represent?
Explain your reasoning.
Answer:
Obtaining a Medical Certificate. Most pilots must have a valid medical certificate to exercise the privileges of their airman certificates. Glider and free.
Explanation:
Aviation safety relies heavily on maintenance. When it is not done correctly, it contributes to a significant proportion of aviation accidents and incidents. Some examples of maintenance errors are parts installed incorrectly, missing parts, and necessary checks not being performed.
2HCI total bond energy
Answer:
It's the oxygen + hydrogemity =the 2 +2=4 but the 4 is a oxygen so its 5
Oil is less dense than water. What happens when you mix the two liquids together?
(A) Oil sinks to the bottom of the container.
(B) The two become one smooth mixture.
(C) The oil floats on top of the water.
(D) The water turns to gas inside the oil.
Answer:
(C) The oil floats on top of the water
Explanation:
If an object/substance is less dense than water it will float on the water.
If an object/substance has the same density as water it will stay submerged in the water, but will not sink to bottom.
If an object/substance is more dense than the water it will sink to the bottom.
If a material is at. the particles in the material are not moving and do not have kinetic energy.
Answer:
Equilibrium
Explanation:
Definition: "A particle is in equilibrium provided it is at rest if originally at rest or has a constant velocity if originally in motion. Most often, static equilibrium is used to describe an object at rest"
The color of the explosive mixture is yellow, green, and red-orange. Explain how the colors are formed and which three metals were most likely present in the rocket??
Answer:
m
Explanation:
The height of a horse is traditionally measured in “hands” where a hand is 4.00 inches. What is the height of a horse, in meters, that is 14.0 hands tall?
Which of these human activities is most likely to cause the excessive growth of Phytoplankton in the world’s oceans? Choose the best 2 answers.
The use of chemical fertilizers that are carried by runoff into rivers
The use of chemical fertilizers that are carried by runoff into rivers
The mining of fossil fuels, which requires digging underground tunnels
The mining of fossil fuels, which requires digging underground tunnels
The spraying of chemical herbicides that reduce carbon dioxide in the air
The spraying of chemical herbicides that reduce carbon dioxide in the air
The logging of old-growth forests, which results in erosion
The logging of old-growth forests, which results in erosion
Using fertilizers on your lawns
Answer:
The use of chemical fertilizers that are carried by runoff into rivers
The use of chemical fertilizers that are carried by runoff into rivers
what is the charge of the cadmium cation
Answer:
In its compounds cadmium exhibits almost exclusively the +2 oxidation state, as in the colourless Cd2+ ion, which forms a number of stable complex ions, especially halide complexes.
Explanation:
Balance the equation:
Ca(PO4)2 + SiO2 = P4O10 + CaSiO3
Answer:
2Ca3(PO4)2 + 6SiO2 → P4O10 + 6CaSiO3.
Which of the following is a limitation of Bohr's model?
Bohr's model failed to explain the behavior of any atom
Bohr's model could not explain how electrons became excited
Bohr's model was able to explain the chemical behavior of only non-metals
Bohr's model was not able to explain the chemical behavior of any atom besides hydrogen
Answer:
The answer is:
The first option
Explanation:
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Examine the molecules below.
Circle the molecules that can also be classified as compounds.
Answer:
the last one is an element rest all are compounds
Explanation:
compounds are 2 or more different atoms that are joined chemically in a fixed proportion
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The products of a neutralization reaction are ________ and ________ a salt.
Answer:
Neutralization reaction is a type of chemical reaction in which an acid and a base react together to form a salt and water as product.
Explanation:
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A skateboarder is going down a ramp. Which statements about the energy of the skateboarder are correct
I couldnt see any choices but if any of the awnsers mention the skateborder having pontential energy turning into kinetic energy that one would be right
Using the periodic table, explain which pair of the following gases have the most similar properties and why. Nitrogen (N), Fluorine (F), Neon (Ne), Krypton (Kr), and Oxygen (O).
Elements that belong to the same group of the periodic table (column) have similar properties. This is because elements of the same group have the same amount of valence electrons. This means that chemically and especially in a chemical reaction (or lack thereof), they will behave similarly.
Neon and Krypton are the only two gases in the list given that belong to the same group of the periodic table (Group 18 - Noble Gases) and as such have similar properties.
Similar Properties of Neon and Krypton:
- Both have 8 valence electrons - They both are very stable and almost unreactive- Both are gases at RTP-Both are odorless, colorless, and tasteless until interaction with an electrical charge.Below is a diagram showing a metal being heated. What name is given to particle Y?
Enter your answer
Answer:
They're called free electrons.
The particle Y marked in the given diagram is electron and surrounding circles indicates metal atom or ions. Free electrons in metal lattice locates at the interstices of the crystal.
What are metals?Metals are electron rich elements exhibit higher thermal electrical conductivity. Metals are a pool of ions or electrons and therefore they form bonds with electronegative elements by donating electrons.
The interstitial sites of metal crystal lattice are occupied with free electrons and they can be transited to another sites or can be excited to get conductivity.
The electron transition from interstices provide the metal lattice some colors. The region from which an electron is transited is called F-center.
Therefore, the particle Y shown in the interstices of the metal lattice is electron.
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Convert 2.68 mol H2O to molecules H2O
Timed test
QUICK QUESTION: why is there 2 hydrogen in the periodic table? I noticed that there’s one hydrogen in group 1 and another in group 17.
Answer:
one is H and the other is HE
Explanation:
H (in group one) stands for Hydrogen, as for He (group 18) stands for Helium
1. New ground begins as barren rock. This rock is covered in lichens, mosses, and ferns. Eventually soil forms. This is the beginning of which process?
Aquatic Succession C Primary Succession
B Secondary Succession D Eutrophication
Answer: ion no cant cap
Explanation: