Neon element which is in gaseous form is used in lit advertising signs as it emits reddish orange glow on passage of current through it.
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
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How does desert pavement form?
Answer:
A common theory suggests that desert pavements are formed through gradual removal of sand and other fine particles by the wind and intermittent rains leaving behind the large fragments. ... Once the pavement is formed the removal of fine particles ceases because the pavement acts as a barrier to further erosion.
Explanation:
do all isotopes decay over time ?
Certain naturally occurring radioactive isotopes are unstable: Their nucleus breaks apart, undergoing nuclear decay. ... All elements with 84 or more protons are unstable; they eventually undergo decay. Other isotopes with fewer protons in their nucleus are also radioactive.
Calculate the volume of an object that has a mass of 20.00 g and a density of 2.45 g/cm^3.
Answer:
2450000 gram
Explanation:
v= m × ρ= 1 cubic meter × 2.45 gram/cubic centimeter= 1000000 cubic centimeter × 2.45 gram/cubic centimeter= 2450000 gram
Explanation:
v=m over D
mass=20.oog
Density=2.45g
20.00-2.45
ans is 17.46
Which of the following is a possible pH for distilled water that has lime (a base) dissolved in it?
a. 1
b. 3
c. 7
d. 9
Answer:
Explanation:
Distilled water has a pH of 7. Anything below that is acidic. One is very acidic. So a b and c cannot be the answer.
Lime is a base. That means that when it is put in water, the pH is going to be greater than 7,
The only possible answer is D
Choose the correct products for the double replacement reaction below. Click here to access the solubility rules to determine which product, if any, forms a solid precipitate in the reaction. AgNO3 KCl Upper K l Upper Pb (Upper N Upper O Subscript 3) Subscript 2 Baseline right arrow. ? K O2 NCl KNO3 AgCl AgK ClNO3 K2NO3 AgCl2.
In both cases, the precipitates were AgCl and PbI2 respectively.
What is a precipitate?A precipitate is a solid product obtained from the reaction of two aqueous phase species. Let us now consider the two reactions listed in the question;
AgNO3(aq) + KCl(aq) ----> AgCl(s) + KNO3(aq)2KI(aq) + Pb(NO3)2 (aq) ----->PbI2(s) + 2KNO3(aq)We can see that in both cases, the precipitates were AgCl and PbI2 respectively.
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Answer:
B and B
Explanation:
edge 2022
Oxygen gas is prepared in the laboratory through the catalytic decomposition of hydrogen peroxide. Define a catalyst
Answer:
Catalyst:
Explanation:
A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
Cells in this organism have different functions (jobs). Unicellular Organism or Multicellular Organism?
Answer:
Multicellular Organism
Explanation:
Unicellular organisms are made of one cell. For example, bacteria. Multicellular organisms are made up of more than one cell. For example, humans.
If the entire organism is one cell, that one cell carries out all the functions. In contrast, we have different cells to carry out different jobs. E.g. blood cells, skin cells, stomach cells and many more.
Does respiration release or absorb energy?
Answer:
it releases energy
Explanation:
Answer:
It releases energy
Explanation:
The reactions involved in respiration are catabolic reactions, which break large molecules into smaller ones, releasing energy because weak high-energy bonds, in particular in molecular oxygen, are replaced by stronger bonds in the products.
How much energy is required when a 142.1 gram sample of aluminum goes from 25.5°C to 46°C? (the specific heat of aluminum is 0.90 J/g °C).
Answer:
2621.75 j heat is required to increase the temperature 25.5°C to 46°C.
Explanation:
Given data:
Mass of sample = 142.1 g
Initial temperature = 25.5°C
Final temperature = 46°C
Specific heat capacity of Al = 0.90 J/g.°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 46°C - 25.5°C
ΔT = 20.5°C
Q = 142.1 × 0.90 J/g.°C × 20.5°C
Q = 2621.75 j
Thus, 2621.75 j heat is required to increase the temperature 25.5°C to 46°C.
FIFTEEN POINTS HELP!!!!! The gravitational strength on Earth is less than the gravitational strength on Jupiter. What will happen to a satellite when it travels from Earth to Jupiter?
Its mass will increase.
Its mass will decrease.
Its weight will increase.
Its weight will decrease.
Answer:
I think it is c.
Explanation:
the weight will increase
because Jupiter has a greater gravitational strength then earth, and the mass does not change wherever you go. So the only awnser that makes sense is c, Its weight will increase.
Please tell me if I'm right or wrong, thanks :)
Can someone tell me this? I’m rlly lost i -
Answer:
A Golgi Body
B Vacuole
C Mitocondrian
D Nucleus
E Cell membrane
Explanation:
Aluminum has a specific heat of 0.900 J/(g°C). How much energy in kJ is needed to raise the temperature of a 625 g block of aluminum from 30.7°C to 82.1°C?
Answer:
About 28.9 kJ.
Explanation:
Recall the formula for specific heat:
[tex]\displaystyle q = mC\Delta T[/tex]
Where q is the amount of heat released, m is the mass of the substance, C is its specific heat, and ΔT is the change in temperature.
Therefore, by substitution, we have that:
[tex]\displaystyle \begin{aligned} q & = (625\text{ g})\left(\frac{0.900 \text{ J}}{\text{g-$^\circ$C}}\right)\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right) \left(82.1^\circ\text{C}-30.7^\circ \text{C}\right) \\ \\ & = (625\text{ g})\left(\frac{0.900 \text{ J}}{\text{g-$^\circ$C}}\right)\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right)(51.4^\circ\text{C}) \\ \\ & = 28.9\text{ kJ}\end{aligned}[/tex]
In conclusion, about 28.9 kJ of energy is needed.
why Kw does not change when the concentration of hydrogen ions increases
Answer:
hope it helps...
Explanation:
it is determined by the concentration of hydrogen ions, the percentage of hydrogen ions contained in the solution.
Let's take water as an example.
As you know, the formula for water is H2O. Most of the molecules in water are in that extremely stable form we know as H2O.
However, a very tiny percentage of those molecules have broken up into hydrogen ions (H+) and hydroxide ions, (OH-), as illustrated in the figure.
Actually, this balance of hydrogen ions and hydroxide ions determines the pH of the water.
When the hydrogen ions outnumber the hydroxide ions, the solution is acidic. If the reverse is true, then the solution is alkaline.
In pure water, the hydrogen ion (hydroxonium ion) awareness has to be equal to the hydroxide ion awareness. For every hydrogen ion fashioned, there may be a hydroxide ion shaped as nicely which means that you can update the [OH-] term inside the Kw expression with some other.
What occurs when the concentration of hydrogen ions increases?As the awareness of hydrogen ions in the solution grows, the greater acidic the solution becomes. As the extent of hydroxide ions will increase the greater primary or alkaline, the solution turns into.
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which of the following provides the best analogy for an electron in an atomic orbital
Answer:
a
Explanation:
the answer is a i'm pretty sure it might be wrong tho i'm sorry
which element has the same electron configuration as the following:
1s22s22p63s23p64s23d104p65s24d
An atom contains 15 protons and 17 neutrons. How many electrons does this atom have and what is its atomic number?
Number of electrons: Atomic Number:
Answer: Electrons: 15 Atomic number :15
Explanation:
4. A student heats copper metal over a flame, and it begins to react with oxygen gas (diatomic
molecule 02) in the air. A green flame is seen. Copper (11) Oxide is formed.
Word
Explanation:
Since Oxygen and Copper combine to form Copper Oxide. Therefore, this is a combination reaction
Hope this helps
A sample of unknown pressure occupies 0. 776L at a temperature of 298K. The sample of gas is then tested under known
conditions and has a pressure of 32. 6 kPa and occupies 0. 664L at 303K. What was the original pressure of the gas?
A. 27. 43 kPa
B. 38. 62 kPa
C. 58. 73 kPa
D. 84. 11 kPa
Answer: A. 27.43 kPa
Explanation:
Use the formula: PV/T = PV/T →
P(.776) / (298) = (32.6)(.664) / (303) →
.0026P = .07144 →
P = 27.43 kPa :)
In the diatomic molecule HCl, the H and the Cl share a pair of
electrons. By doing so, the hydrogen atom attains the electron
configuration of while chlorine attains the electron
configuration of
Answer:
helium and argon
Explanation:
The helium dimer is a van der Waals molecule containing two helium atoms with the formula He2. This chemical is the biggest diatomic molecule, which is a molecule made up of two atoms that are bound together. This dimer's connection is so weak that it will break if the molecule spins or vibrates too much.The noble gases (helium, neon, argon, krypton, xenon, and radon) are also monatomic gases at STP. To distinguish them from other gases that are chemical compounds, homonuclear diatomic gases and noble gases are referred to as "elemental gases" or "molecular gases."Can some one help me ASAP with the 3rd and 4th answer please! This is due at 7:30 in the morning
Answer:
3. add water to develop the procedure.
4. of course,, because sugar dissolves and sand does not.
What is carbon sink and how it effects our environment?
Answer:
Explanation:
Carbon sink is basically anything that absorbs carbon from the atmosphere. Particularly, the soil, trees, plants and the ocean absorb the most carbon, which helps with greenhouse emission.
Can y’all just list 3 evidence for evolution. Total 3 sentences!!!
(WILL MARK BRAINLIEST) promise :)
:D
Off the top of my head I only have one example of evolution on humans lol
Wisdom teeth
Explanation:
Our ape-like ancestors used to use wisdom teeth to chew on bark and other hard foods. Today, we don't use them at all, and we're even at the point that some people are born with no wisdom teeth at all.
Answer:
Evolution is a change in the genetic makeup of a population over time.
A few evidences are:
Anatomy. Species may share similar physical features because the feature was present in a common ancestor (homologous structures).
Molecular biology. DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are.
Biogeography. The global distribution of organisms and the unique features of island species reflect evolution and geological change.
Fossils. Fossils document the existence of now-extinct past species that are related to present-day species.
Direct observation. We can directly observe small-scale evolution in organisms with short lifecycles.
Hope this helps! :D
help asap If an engine does 200 J of work in 5 s, how much power was generated?
A. 4 W
B. 4000 W
C. 40 W
D. 400 W
[tex]p = \frac{e}{t} [/tex]
where e is the energy.
& t is the time.
[tex]p = \frac{200}{5} = 40 \: w[/tex]
Can someone identify all these crystals?
Ah, yes, these are all very special, and have different looks and textures, to learn about these awesome rocks,
Take a look at the chart shown.
Eutrophication causes loss of Biodiversity”. Substantiate the statement
Eutrophication causes loss of biodiversity because many species need light to survive. It affects light penetration in the water body.
What is eutrophication?Eutrophication is a phenomenon where an aquatic environment (e.g., a lake) is enriched with minerals and nutrients.
The most common nutrients associated with eutrophication are nitrogen and phosphorus.
Eutrophication can severely affect light penetration in the water body, thereby affecting the survival of producer organisms (plants) and causing a loss of biodiversity across all trophic levels.
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how would you separate salt and sugar
Answer:
Evaporation
Explanation:
If the water is completely evaporated we will get separated sugar from the mixture. If we dissolve the mixture in alcohol we will get the salt separated while sugar will be dissolved in alcohol.
Electromagnetic radiation emitted from a hot object reaches it's peak at a wavelength of 8.5 x 10-7 m. What is the frequency of this radiation
Answer:
the frequency is 18
Explanation:
please mark me as the branlest hope it helps please
How is a precipitate evidence for a chemical reaction?
Formation of precipitate is usually an evidence of a chemical change. The precipitate is a new substance that gets created due a chemical reaction between two or more different substances. The precipitate can be the formation of a solid within a liquid or the formation of a solid within a solid due to a chemical reaction or change. The solid formation within a liquid is known as precipitate. This kind of chemical reaction can be seen in normal and daily life, as well as in laboratories.
a 50.o mL beaker contains 680. g mercury what is the density of mercury?
Answer:
13.6 m/v
Explanation:
d=m/v
d=680/50
d=13.6
ЗАl2(SO4)3
How many oxygen atoms are present?
Answer:
12 oxygen atoms
Explanation:
Multiply 3x4 and get 12 that's the easiest way I can explain it lol