Answer:
Ions combine into only one ratio
Explanation:
Just took test
Prefixes are not used to indicate the number of atoms when writing the chemical formula. The number of atoms are written as subscripts to their chemical symbols.
What is chemical formula?Chemical formula of a compound is used to identify a compound and distinguishes it from other compounds. A chemical formula is written from the chemical symbols of elements which constitute the compound.
The number of atoms of each element is written as the subscripts of the symbols for each atoms. For example,magnesium chloride contains one magnesium and two chlorine atoms thus, its formula is MgCl₂.
The subscripts for each atom in the formula of an ionic compound is the charge of the other atom into which it is bonded. Similarly, the formula of iron oxide containing 2 Fe and 3 O is written as Fe₂O₃.
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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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which of these is not a mixture
a.) baking soda
b.)salt and water
c.)metal paper clips and plastic paper clips
What do these floors represent?
Explanation:
What type of floor. You have uploaded no image
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
what bond is a sea of free flowing electrons
Answer:
metallic bonds
Explanation:
in metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions.
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How are chemicals used to produce colors in fireworks?
Answer:
The colors are produced by heating metal salts, such as calcium chloride or sodium nitrate, that emit characteristic colors. List of colors and elements in Fireworks: Aluminum – Aluminum is used to produce silver and white flames and sparks.
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
plzzzz help me I will mark u brainist
Answer:
B. Aluminum has layers of electrons that can slide over one another.
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.
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.
Which of these items found on a food label IS NOT a food?
Calories
Sugar
Proteins
Total fats
Answer:
the first one Calories
67. What is an atomic nucleus? (1 point)
the outer part of an atom in which electrons move
the outer part of an atom in which neutrons move
the central part of an atom, composed of protons and neutrons
the central part of an atom, composed of protons and electrons
Answer:
Explanation:
the central part of an atom, composed of protons and neutrons
Answerhi
Explanation:
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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
effective nuclear charge of Ga
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
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)
help please. a container has a mixture of iron fillings and sand.
Answer:
b
Explanation:
iron fillings are magnetic
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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Just need help with these 2 problems
Answer:
All of the above
A person lifts up a box from the ground and places it on a shelf
Explanation:
Work done is the force applied on a body to move it through a particular distance or to cause displacement.
In describing work done:Force applied which is the push or pull on a body is very important
Distance or displacement which is the resultant length of path traveled by the body is key.
Work done = force x distance moved in the direction of the force
A person lifting a box is doing work.
Explain what an air mass is?
An
yedsdfsdfdsfsdfsd f sdf ssdf sdfsdf sd fsdf sd
Explanation:
Answer:
A body of air with horizontally uniform temperature, humidity, and pressure.
Explanation:
hope this helped :)
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
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
1.- ¿Qué relación hay entre el uso óptimo de artefactos eléctricos en el hogar y el consumo de energía eléctrica? 2.- ¿Qué conocimientos de la física explican el uso óptimo de energía eléctrica? 3.- ¿Cómo se determina el consumo mensual de energía eléctrica? 4.- ¿Cómo se calcula el costo de este servicio?
Answer:
1- El uso óptimo de artefactos eléctricos en el hogar y el consumo de energía eléctrica tienen una relación de absoluto ligamen. Así, a mayor cuidado del consumo, y mejores los artefactos en su relación prestación/consumo, menor será el consumo de energía eléctrica en el hogar y, por ende, menor el gasto en el servicio.
2- El uso óptimo de energía eléctrica se explica a través de la física mediante el concepto de resistencia eléctrica, es decir, a mayor resistencia eléctrica, mayor será el consumo que el artefacto generará.
3- El consumo mensual de energía eléctrica se determina a través de la cantidad de kilovatios que cada hogar consume mensualmente. Así, a mayor cantidad de kilovatios (que es la unidad de medida de la energía eléctrica), mayor será el consumo.
4- El costo del servicio se valúa en función de los kilovatios consumidos en el periodo de medición. Así, cuando mayor sea el consumo mayor será el costo; incluso en algunos lugares, como Argentina, cuanto mayor sea el consumo de electricidad, mayor será el costo del kilovatio.
20 PTS!!! Jack said that unprocessed oil is a mixture of many organic compounds. Jane said that unprocessed oil needs to be processed so that individual compound can be isolated. Who made the correct statement and why?
1. Jack is correct, unprocessed oil is a mixture of many organic compounds. Jane is not correct, they do not need to be processed to be used.
2. Jack is incorrect, unprocessed oil is not a mixture of many organic compounds. Jane is correct, unprocessed oil needs to be processed to be used.
3. Both Jack and Jane are correct. Unprocessed oil, petroleum, is a mixture of organic compounds that need to be isolated or separated to be used.
4. Neither Jack nor Jane are correct. Unprocessed oil, petroleum, is not a mixture of organic compounds and it does not need to be isolated or separated to be used.
Answer:
Explanation:
i am thinking 3 and 2 but i am gonna say it is 2
98.654321%
Answer:
Both Jack and Jane are correct. Unprocessed oil, petroleum, is a mixture of organic compounds that need to be isolated or separated to be used.
Explanation:
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!
A part of the periodic table is shown
11
Na
19
K
37
Rb
12
Mg
20
Ca
38
Sr
Which of the following elements has the highest atomic mass (amu)?
a Sodium (Na)
b Calcium (Ca)
c Strontium (Sr)
d Potassium (K)
Answer:
c
Explanation:
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
How many molecules make up 0.051 moles of Potassium chloride (KCl)?
Answer: ???? molecules KCl (no rounding; remember to use scientific notation when necessary)
Answer:
3.0702 × 10²² moleculesExplanation:
The number of molecules potassium chloride can be found by using the formula
N = n × Lwhere 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
N = 0.051 × 6.02 × 10²³
We have the final answer as
3.0702 × 10²² moleculesHope this helps you
Determine between what two integers the square root of a number is (M7NS-Ig-2
Answer:
yyhhyvffcfcrfrcfcrfrfrfrc
