He then split the list of elements into several columns so that elements beside each other had similar ?
The columns into which the elements were split are called groups and the elements in the same group display similar properties.
What is a group?A group refers to elements that have similar chemical properties and occur in the same column in the periodic table.
Hence, the columns into which the elements were split are called groups and the elements in the same group display similar properties.
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Electromagnetic waves are used in many technological devices. Describe two examples of how energy from electromagnetic waves is used in technologies to do work. Include at least one wave property that is important for each example.
Answer:
Electromagnetic waves are ubiquitous in nature (i.e., light) and used in modern technology—AM and FM radio, cordless and cellular phones, garage door openers, wireless networks, radar, microwave ovens, etc. These and many more such devices use electromagnetic waves to transmit data and signals.
Explanation:
i mean there's alot of stuff that have Electromagnetic waves in it i mean alot!
The two examples of how energy from electromagnetic waves is used in technologies to do work are (i) For communication and radar radio waves are used. (ii) For cooking our food microwaves are used.
What is Electromagnetic Wave ?Electromagnetic waves are also called as EM waves are waves that are composed of vibrations between a magnetic field and an electric field. Electromagnetic wave are represented by a sinusoidal graph.
How energy from electromagnetic wave used in technological applications ?For communication and radar radio waves are used. For cooking our food microwaves are used. Infrared waves are used in remote controls. Mobile phones send microwave signals by the atmosphere.
Thus from the above conclusion we can say that The two examples of how energy from electromagnetic waves is used in technologies to do work are (i) For communication and radar radio waves are used. (ii) For cooking our food microwaves are used.
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16. If you have 12.04 * 1023 molecules of carbon, how many moles of carbon do you
have?
Answer:
2 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{12.04 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{12.04}{6.02} \\ [/tex]
We have the final answer as
2 molesHope you this helps you
Potassium iodide can be decomposed by electrolysis (an electric current) into the elements potassium and iodine. Based on this information, how would potassium iodide be classified?
compound
heterogeneous mixture
homogeneous mixture
solution
Answer:
compound
Explanation:
Potassium iodide is a compound from the description given. The components of the compound is made up of elements and can only be broken down by chemical means.
A compound is a substance composed of two or more kinds of atoms or elements joined together in a definite grouping. The properties of the compound are distinct and different from those of the individual elements that are combined in its make - up.When compounds are broken down they are made up of elements.
Name one of the magnetic metals that is NOT Iron.
Answer:Two metals that aren't magnetic are gold and silver.
Explanation:
Cobalt and nickel and El Fouladh
How many atoms are in 2 grams of Radon (Rn)?
Answer:
i do not uterstand
Explanation:
what is the role of electric current in electrolysis
Answer:
Electrolysis, process by which electric current is passed through a substance to effect a chemical change. ... Electric current (i.e., electrons) enters through the negatively charged electrode (cathode); components of the solution travel to this electrode, combine with the electrons, and are transformed (reduced)
The nuclear symbol for uranium-235 should be written as
o U-235.
233
92 U
235
143 U
OU
Answer:
²³⁵₉₂U
Explanation:
The nuclear symbol of the nuclei is ²³⁵₉₂U.
The uranium nuclei has;
mass number = 235
atomic number = 92
To write the structure of the atom;
The subscript before the symbol of the atom is the atomic number
The superscript is the mass number
So;
²³⁵₉₂U is the symbol of the nuclei.
calculate the number of neutrons in the chorine 17CI and 17CI
Answer:
18 neutrons
Explanation:
In the element;
₁₇Cl
The number of electrons in the chlorine atom is 17.
The mass number of chlorine is 35.
Mass number is the number of protons plus number of neutrons.
Mass number = Protons + neutrons
Neutrons = mass number - protons
Number of protons in chlorine is 17;
So;
Neutrons = 35 - 17 = 18
Is it good to help a pregnant girl raise a baby?
Answer:
Yea fs
Explanation:
If an object has a 30 kg mass on Earth, what would be it's approximate weight on Earth?
Answer:
If something were to weigh 30 kgs on Earth, they would also weigh around 66 pounds on Earth.
Explanation:
1 pound = 2.20462 kilograms.
Next, multiply 2.20462 and 30 and you should get 66.1386, or 66 pounds.
Why is water sometimes called the universal solvent?
A.
because only salts can dissolve in water
B.
because water is not good at cleaning things
C.
because many substances dissolve in water
D.
because water is a clear liquid
Which of these expressions are correct variations of the Combined Gas Law?
Answer:
Both
Explanation:
The combined gas law is also known as the general gas law.
From the ideal gas law we assume that n = 1;
So;
PV = nRT
and then;
[tex]\frac{P_{1}V_{1} }{T_{1} }[/tex] = [tex]\frac{P_{2}V_{2} }{T_{2} }[/tex]
If we cross multiply;
P₁V₁T₂ = P₂V₂T₁
So;
T₁ = [tex]T_{2} \frac{P_{1}V_{1} }{P_{2} V_{2} }[/tex]
Also;
V₂ = [tex]V_{1} \frac{P_{1} T_{2} }{P_{2} T_{1} }[/tex]
So from the choices both are correct
how do I ask a girl I like to go out with me I need a woman's opinion
Answer:
Don't just walk up to a person you think is cute and ask them out. Start with small talk and gauge common interests. “See how they respond,” Overstreet says. “For example, if you approach someone and they don't reply, are short with you, or move further away, then move on.
Explanation:
While making chicken soup for his family one evening, Luis added the amount of salt the recipe called for. After tasting the soup, he decided the seasoning was correct. He then he let the chicken soup simmer for two hours to blend the flavors. But when he served the soup, it was too salty. What happened to the soup to make it so salty?
Answer:
the soup become too salty through the process of osmosis
Calculate the volume of a sample of aluminum that has a mass of 3.057 kg. The density of aluminum is 2.70 g/cm3 (taking into consideration the rounded to three significant figures)
Answer:
v = 1130 cm³
Explanation:
Given data:
Volume of sample = ?
Mass of Al sample = 3.057 Kg (3.057 Kg× 1000g/1 Kg = 3057g)
Density of Al sample = 2.70 g/cm³
Solution:
Formula:
d = m/v
d = density
m = mass
v= volume
by putting values
2.70 g/cm³ = 3057g /v
v = 3057g /2.70 g/cm³
v = 1130 cm³
Which two body systems are most important in breaking down food and distributing nutrients throughout the body?
Answer:
hope you like and pls follow me
Explanation:
digestive and circulatory system are most important in breaking down food and distributing nutrients throughout the body.
Determine between what two integers the square root of a number is (M7NS-Ig-2
Answer:
yyhhyvffcfcrfrcfcrfrfrfrc
how many electrons does Na have
Answer: 11 electrons
Explanation: The atomic number of sodium is 11. This tells us that sodium has 11 protons and because it is neutral it has 11 electrons.
What does the H of a reaction represent?
Answer:
c. h represents the total energy in a reaction
Answer:
B. It represents the heat involved in a reaction
Explanation:
It would make sense since most of the time h in chemistry
is the equivalent to heat.
I hope this helped you!
Which of the following statements is true? Sound waves create areas of high and low pressure, Areas of high pressure are called compressions. Areas of low pressure are called rarefactions. All of the above. .
Answer:
all i think
Explanation:
Since the amount of yeast stays the SAME, it is considered to be a?
A. Variable
B. Constant
What are the 3 forces that make the tectonic plates
move
Answer:
Viscous Drag.
Slab-Pull Force.
Ridge-Push Force
Explanation:
your welcome have a nice day
which of these is not a mixture
a.) baking soda
b.)salt and water
c.)metal paper clips and plastic paper clips
How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 120 contain?
The study of chemicals and bonds is called chemistry.
The correct answer is 50, 50, and 70.
In an element, there are the following things:-
ElectronsProtonsNeutronsIn elements, the number of protons and electrons are the same. hence, the number of electrons and protons in an element is 50.
The neutrons are defined as the proton minus mass number. Hence, the number of neutrons is 120-50=70
Hence, the answer is 50, 50, and 70
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help please. a container has a mixture of iron fillings and sand.
Answer:
b
Explanation:
iron fillings are magnetic
What do these floors represent?
Explanation:
What type of floor. You have uploaded no image
What is a common use of nitric acid?
Answer: Nitric acid is used in the production of ammonium nitrate and calcium ammonium nitrate which find applications as fertilizers. Ammonium nitrate is also used in the manufacturing of urea ammonium nitrate (UAN) used in fertilizer formulations and also as explosives.
Explanation:
We can see here that some common uses of nitric acid:
Manufacturing of Fertilizers: Nitric acid is a key component in the production of nitrogen-based fertilizers, such as ammonium nitrate and urea. Production of Explosives: Nitric acid is used in the manufacturing of explosives, including dynamite, trinitrotoluene (TNT), and nitroglycerin.What is nitric acid?Nitric acid is a highly corrosive and strong mineral acid. It is a clear or yellowish liquid that is commonly used in various industrial, laboratory, and chemical applications.
In its pure form, nitric acid is a colorless liquid, but it can have a yellowish tint due to the presence of nitrogen dioxide, which forms when nitric acid reacts with air.
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Peter weighs 100 pounds. He ran up a 6 foot hill in 2 seconds. What was Peter's power output?
A. 1,200 ft-lbs./sec
B. 600 ft-lbs./sec
C. 300 ft-lbs./sec
D. 100 ft-lb/sec
Answer:
300lb-ft/secs
Explanation:
Given parameters:
Weight of Peter = 100lb
Height of hill = 6ft
Time taken = 2s
Unknown:
Power output of Peter = ?
Solution:
Power is the rate at which work is being done. It is expressed as;
Power = [tex]\frac{Work done }{time taken}[/tex]
Work done = force x distance = weight x height = 100lb x 6ft
Work done = 600lb-ft
Power = [tex]\frac{600}{2}[/tex] = 300lb-ft/secs
Answer:
Answer option C: 300ft-lbs/sec is your answer
How many moles make up 5.7491x1025 molecules of Dinitrogen pentoxide (N2O5)?
Answer: ??? moles N2O5 (round to 3 sig figs)
Answer:
95.5 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{5.7491 \times {10}^{25} }{6.02 \times {10}^{23} } \\ [/tex]
We have the final answer as
95.5 moles to 3 sig. figuresHope this helps you
