Answer:
1.25 x 10^15Hz
Explanation:
c = frequency x wavelength
c is the speed of light, which is equal to 3.00 x 10^8 m / s
frequency = c /wavelength
= (3.00 x 10^8m /s) / (2.40 x 10^-5 cm x 1 m /100cm)
= (3.00 x 10^8 m/s) / 2.40 x 10^-7m
= 1.25 x 10^15/s 1 / s = 1Hz
So, the Frequency = 1.25 x 10^15Hz
I hope this helped :)
Physical or chemical ?
1. Starch molecules are formed from smaller glucose molecules.
2. Iron rusts
3. Ice melts
4. A match burns
5. Plants leaves lose water through evaporation
6. Hydrochloric acid reacts with sodium hydroxide to produce a salt, water and heat
7. Food is digested
8. A pellet of sodium is sliced in half
9. Proteins are made from amino acids
10. A toothpick is broken in half
ill give brainliest
Answer:
P,C,P,C,P,C,P,P,C,P
Explanation:
Would the moon phases change if the earth was rotated 90 degrees? If so, how?
Answer:
This is a very hypothetical question with a very scientifically hypothetical answer, keep in mind.
If Earth's axis tilted to 90 degrees, extreme seasons would cause intense climate change on every continent. During the summer, the Northern Hemisphere would experience nearly 24 hours of sunlight for months, which could melt ice caps, raise sea levels, and flood coastal cities.
What is the mole ratio of the following equation?
2Mg + O2 + 2MgO
O 2:1:2
O 1:2
O 2:2:2
o 2:1
What are the five properties of matter?
Explanation:
Physical Properties
color (intensive)
density (intensive)
volume (extensive)
mass (extensive)
boiling point (intensive): the temperature at which a substance boils.
melting point (intensive): the temperature at which a substance melts.
Please help me with this question
Answer:
Explanation:
Carbon C
**WHOEVER SOLVES THIS GETS A LOT OF POINTS
***Look at img below
Answer:
what
Explanation:
I cant see your question yet
Answer:
the question really said :
The usage of solar, wind, and geothermal energy resources is most limited by:
(answer choices)
A.laws prohibiting the use of the resources
B.size of the resources
C.animal habitat around the resources
D.location of the resources
Min increases the temperature of a gas in an expandable container. If she keeps the pressure constant, what will happen to the volume of the gas?
Answer:
The volume will remain the same.
Explanation:
The volume of a given gas sample is directly proportional to its absolute temperature at constant pressure (Charles's law)
There are so many gas laws like Charles's law, Avogadro’s law, Boyle 's law and many more. If pressure of gas is kept constant, then volume of the gas will be increasing.
What is Charles's law?According to Charles's law, gas expands on heating. At constant pressure, volume well be directly proportional to temperature.
According to ideal gas equation
PV=nRT
On keeping pressure constant the following equation can be deduced to Charles's law as
V₁÷T₁=V₂÷T₂
where,
V₁= initial volume
V₂= final volume
T₁=initial temperature
T₂=final temperature
According to Charles's law, the volume of a given gas sample is directly proportional to its absolute temperature at constant pressure.
Therefore, if pressure is kept constant, then volume of the gas will be increasing.
To know more about Charles's law, here:
https://brainly.com/question/16927784
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.
(04.01 LC)
Match each term to its meaning. (3 points)
Substance at the beginning of a reaction
[Choose ]
Substance at the end of a reaction
[Choose]
Number placed before a compound in a
chemical equation
[Choose ]
Answer:
Substance at the beginning of a reaction- reactant
Substance at the end of a reaction- product
Number placed before a compound in a chemical equation- stoichiometric coefficient
Explanation:
In a reaction equation, the species written on the left hand side of the equation are called the reactants.
The reactants combine to form the species on the right hand side of the reaction equation called products.
The stoichiometric coefficient is a number written before the formula of a compound in the reaction equation.
PLEASE HELPPPPP :(
Megan likes to take hot showers before she goes to bed. She makes sure that the temperature of the water is warm enough to create steam. When she gets out of the shower, she has to wipe the mirror because there is so much water on it. Which statement best describes why there is water on the mirror?
A. The steam collected on the mirror and got cooler, causing it to condense into water droplets.
B. The steam collected on the mirror and got warmer, causing it to condense into water droplets.
C. The steam collected on the mirror and then boiled, leaving behind water droplets.
D. The steam collected on the mirror and then evaporated, leaving behind water droplets.
Answer:
A
Explanation:
The mass of all substances present before a chemical change
A. is greater the mass of all substances remaining after the change
B. is less than the mass of all substances remaining after the change
C. equals the mass of all substances remaining after the change
Answer:
C. Equals the mass of all substances remaining after the change.
Explanation:
Antoine Lavoisier's 1789 discovery in regards to the Law of Conservation of Mass states that no mass is created nor destroyed in a chemical reaction.
Lithium atom of electron configuration 2,1 , it will …………. One electron to become stable ion.
lose
Gain
Share
Answer:
lose
Explanation:
as you have mentioned it has a electronic configuration as 2,1 that means it has one electrone in its last shell which is unstable. in ur mcq it has lose,gain.share
in order to be a stable atom lithium should either give away that one electron or gain 7 electrons. so as to ur question 7 electrons is out of the track so it is lose one electron
hope this helps
2. 1.5 moles of AgNO3 reacts with 0.5 mole of Mg3P2. Calculate the moles of excess
reactant that remains at the end of the reaction. Include math to justify your answer.
Answer:
No of Moles in excess at the end of the reaction is 0.25 moles
Explanation:
AgNO3 + Mg3P2 → Ag3P + Mg(NO3)2
Balancing the equation we get
6AgNO3 + Mg3P2 → 2Ag3P + 3Mg(NO3)2
6 moles of AgNO3 needs 1 mole of Mg3P2
using unitary method
AgNO3 = [tex]\frac{1}{6}*Mg3P2[/tex]
1.5 AgNO3 = [tex]\frac{1}{6}*1.5[/tex]
= 1/4 = 0.25moles of Mg3P2
So 1.5 Moles of AgNO3 requires 0.25Mg3P2 for complete reaction but we have 0.5Moles of Mg3P2 available Therefore Mg3P2 is in excess
No of Moles in excess at the end of the reaction = 0.5 - 0.25 = 0.25moles
The picture shows an ice cube melting.
How is thermal energy transferred in this scenario?
A. Thermal energy moves from a warmer object to a cooler object until all the substances are different temperatures.
B. Thermal energy moves from a warmer object to a cooler object until all the substances are the same temperature.
C. Thermal energy moves from a cooler object to a warmer object until all the substances are the same temperature.
D. Thermal energy moves from a cooler object to a warmer object until all the substances are different temperatures.
Answer:
B. thermal energy moves from a warmer object to a cooler object until all the substances are the same temperature
PLEASE HELP FAST!!! Which is a characteristic of colloids?
Which one?
A. Are homogeneous mixtures
B. Have large dispersed particles
C. Will settle out over time
D. Are made up of at least two substances
Answer:
the answer is D. Are made up of at least two
Explanation:
took the test on edge
Arrange the elements in increasing order of reactivity : iron, gold, zinc, copper
Answer:
Iron, Copper, Zinc, and Gold
Explanation:
in Table of elements
Iron was no. 26
Copper no. 29
Zinc no. 30
Gold no. 79
Can someone help me please ?
Answer:
1.w
2. Z
3. Y
4.X
...................
How are ionic bonds and metallic bonds different from each other?
Include: what occurs with electrons in each type of bond? How/why the atoms are attracted (bonded) to each other?
Answer:
Ionic bond is bond between a metal and non metal , metallic bonding happens between positive metals ions and negative electrons in a metal
Explanation:
ionic Bond is the transfer of electrons between a metal and non metal due to strong electrostatic force of attraction between positive metal ions and negative non metal ions
in metallic bonding , there is a force of attraction between positive metal ions and the sea of electrons surrounding it
please helpp The “wall” and the spaces in between are just like the_______ in a living cell.
Answer: cell membrane
Explanation: Plzz mark me as brainliest!
what is the difference between a halogen and a halide?
need help urgently!
Answer:
In context|chemistry|lang=en terms the difference between halogen and halide. is that halogen is (chemistry) any element of group 7, ie fluorine, chlorine, bromine, iodine and astatine, which form a salt by direct union with a metal while halide is (chemistry) a salt of any halogen acid.
Explanation:
Answer:
When examining the periodic table, you will find that halogens are the electronegative elements in column 17, including fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Halides are chemical compounds that contain halogens. ... Halides can be found in minerals, animals, and plants.
Hope this helps u... ^_^❤️What kind of metal is Calcium, and where is it found?
Answer:
Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air.
Explanation:
Please can somebody give me the correct answers.please be realigned
I will be so grateful!!
Answer: I hope this helps :
An element in Group 5 = Bismuth (Bi)
A halogen = Fluorine (F) or Astatine (At)
An alkali Metal = Lithium (L)
A metal in Group 6 = Selenium (Se) , Tellurium (Te) , Polonium (Po)
A gas made up of individual atoms = Argon (Ag)
An element that forms 1+ ions = Lithium
The most reactive element in Group 1 = francium (it doesn't appear in the image)
The most reactive element in Group 7 = Fluorine
An element that is a good catalyst= Iron (Fe) Cobalt (Co) , Nickel (Ni)
An element that does not react with anything = Argon
A metal that floats on water = Lithium
An element with a full outer energy of electrons = Helium (He), neon (Ne), and argon (Ar)
A transition Metal = Iron (Fe) Cobalt (Co) , Nickel (Ni)
A noble gas = Argon (Ar)
The element in Group 6 , Period 5 = Molybdenum , Tellurium
A non-metal = Fluorine , Argon
A gas made up of Diatomic molecule = Argon (Ar)
An element that forms 1- ions =
The Group 1 element with the highest melting point = Lithium
The Group 7 element with the highest boiling point = Astatine (As)
An element with 3 electrons in it's outer energy level = Boron
An element that forms coloured compounds = Iron
An element that has a coloured vapour = Chlorine Fluorine
A metal that can form ions with different charges = Iron, Cobalt , Lead
Explanation:
Halogen : Are any of the six nonmetallic elements that make up Group 17 of the periodic table e.g fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At).
All elements in Group 1 are Alkali metals( except hydrogen)
Examples :lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).
A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen)
Argon is one of the inert gases that normally exist as single atoms.
Transition metals are good metal catalysts because they easily lend and take electrons from other molecules. A catalyst is a chemical substance that, does not affect the thermodynamics of a reaction but increases the rate of reaction.
Transition metals ; Scandium. Titanium. Vanadium. Chromium. Manganese. Iron. Cobalt. Nickel.
Noble gases(inert gases) don't react with anything . The family of noble gases includes helium, neon, argon, krypton, xenon, and radon.
Lithium is the lightest metal and has density about half of water.
Group 18 elements (helium, neon, and argon are shown) have a full outer, or valence, shell.
chlorine, fluorine, carbon, nitrogen, arsenic, phosphorus, selenium are examples of non-metal.
Noble gases : helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn).
The following 5 element gases are found as diatomic molecules at room temperature and pressure:
Hydrogen – H. ...
Nitrogen – N. ...
Oxygen – O. ...
Fluorine – F. ...
Chlorine – Cl.
Lithium, Li melts at 180°C.
From the lowest boiling and melting point to the highest, the group in order is fluorine, chlorine, bromine, iodine and astatine.
Like other transition metals, iron forms coloured compounds. The table shows some examples of these. Note that iron can form two different ions in its compounds. Iron(II) compounds contain the Fe 2+ ion and iron(III) compounds contain the Fe 3+ ion.
Elements in group seven(Halogens) : As you move down the group the halogens become darker in colour. For example fluorine is a very pale yellow whereas iodine will be dark purple in colour when it is in a vapour state.
A few elements, all metals, can form more than one possible charge. For example, iron atoms can form 2+ cations or 3+ cations. Cobalt is another element that can form more than one possible charged ion (2+ and 3+), while lead can form 2+ or 4+ cations.
True or false table salt NaC1 is a molecular compound
Answer:
If you mean NaCl is table salt than true
but if you mean NaC1 than false
Explanation:
Hydrogen bonds can be found between molecules of which of the following
HF
C3H8
H2
CH4
Answer:
HF
Explanation:
Hydrogen bond is one of the chemical bonds that holds atoms and molecules together. Hydrogen bonding forms between an hydrogen atom and an electronegative atom such as fluorine, oxygen, or nitrogen. These electronegative atoms pull most of the electrons from the hydrogen atom, thereby, making the molecule a polar one.
An example of molecules that forms hydrogen bonding is Hydrogen fluoride (HF). The hydrogen atom of one HF molecule is attracted to the very electronegative fluorine atom of another HF molecule due to the difference in electrons. This forms the HYDROGEN BOND in HF molecule.
6) Aluminum bromide decomposes
Answer:
The reaction begins and builds up heat. This heat causes the aluminum to melt and float on top of the liquid bromine (which is producing a cloud of vapor because the heat is also boiling it). Wherever the two elements meet, sparks, heat, and light are given off.
Explanation:
be more specific
Please help me out with this...please
I also put the periodic table too just in case:)
The map below shows the top view of a meandering stream as it enters a lake.
At which point, along the stream, are erosion and deposition?
A.
Erosion occurs at points B and D, deposition occurs at A and C
B.
Erosion occurs at points A and B, deposition occurs at C and D
C.
Erosion occurs at points A and C, deposition occurs at B and D
D.
Erosion occurs at points B and C, deposition occurs at A and D
Answer:
c
Explanation:
The erosion starts at A moving sand or soil, then drops it at B-D.
Please Help Me!!!I will mark Brainliest!!!
Answer:/
Explanation:
Photosynthesis uses all of the following except___to make food.
A) Carbon dioxide
B) Chemical energy
C) Light energy
D) Water
Answer:
A
Explanation:
thanks me hehe lovelots
Which combination of principal energy level and sublevel
CANNOT exist?
Answer: 2d
Explanation:
Because you can not make a 2d