Answer:
Ways we use radio waves on Earth are television and FM and AM radio broadcasts, military communications, mobile phones, ham radio, wireless computer networks, and numerous other communications applications.
Explanation:
Ways we use radio waves on Earth are television and FM and AM radio broadcasts, military communications, mobile phones, ham radio, wireless computer networks, and numerous other communications applications.
What are radio waves?An electromagnetic wave of a frequency between about [tex]10^4[/tex] and [tex]10^{11}[/tex]or [tex]10^{12}[/tex] Hz, as used for long-distance communication.
AM and FM Radio Broadcasting which involves transmitting sound to a wide audience.
Radar is a detection system that uses radio waves to get information about objects.
Bluetooth and wireless communication use radio waves to create connections between devices.
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help me with this pleaseeeeeee
Magnesium oxide is an ionic compound with a very high melting point and which requires a large amount of energy for melting.
What are ionic compounds?Ionic compounds are compounds which are formed between oppositely charged ions which are held together by electrostatic forces of attraction between the oppositely charged ions.
Ionic compounds are formed when metal atoms donate electrons to non-metals atoms to form ions.
Magnesium oxide is an ionic compound.
The nature of bonding is ionic bonding.
It has a crystalline lattice structure.
The forces of attraction is electrostatic forces of attraction.
It has a high melting point of 2,852 °C, and thus requires a large amount of energy go melting to occur.
Therefore, magnesium oxide is an ionic compound which requires a large amount of energy for melting.
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complete and balance the following equation b. Br2 + Nacl
How many moles of water (H20) are produced when 2 moles of KMnO, react with plenty of HCI? Show work if can will give most points :) !!
I hope this helps, you can ask any questions for clarification
How many moles of lead chloride pbCl2, will be produced if 10.0 moles of Orion chloride FeCl33 reacted
Answer:
0.72 moles of hydrochloric acid are needed to completely react with 0.36 mol of lead.
Explanation:
I hope this helps you! :)
Which of the following helps explain why experiments involving speed and velocity are important? (1 point)
Experiments involving speed and velocity are important because they have not been investigated much and scientists still do not fully understand how speed and velocity are related
Experiments involving speed and velocity are not important because they have already been thoroughly investigated by scientists and there is nothing more to learn.
Repeated experiments with airplanes and how their velocity changes as a result of environmental conditions like wind can help scientists develop a model for flight paths and launch times to
minimize fuel usage
O Repeated experiments that change motivational foods for tortoises on tracks can help scientists determine preferred eating habits
The statement that explain the important of experiment with speed and time is
Repeated experiments with airplanes and how their velocity changes as a result of environmental conditions like wind can help scientists develop a model for flight paths and launch times to minimize fuel usage.
What is an experiment?An experiment is a scientific procedure or technique carried out in a place to discover or test the validity of something.
Velocity refer to the rate of change of body's position and direction in respect to time.
Speed is the distance travel by an object in respect to time.
Therefore, The statement that explain the important of experiment with speed and time is
Repeated experiments with airplanes and how their velocity changes as a result of environmental conditions like wind can help scientists develop a model for flight paths and launch times to minimize fuel usage.
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sodium oxide can react with water to produce sodium hydroxide. in the reaction, how many moles of sodium hydroxide will be produced.
Answer: 2 mol of NaOH
Explanation:
The balanced chemical equation for the reaction is:
Na2O + H2O --> 2NaOH
Looking at this, we can see that 1 mol of Na2O will react with 1 mol of H2O to produce 2 mol of NaOH
Anyone know this? Cuz I don’t this one is
Answer:
its legislative.
At what age did Lavoisier die?
Answer:
50 years old
Explanation:
Antoine Lavoisier died by the guillotine at the age of 50 on May 8, 1794 in Paris.
Hope this helps...
- profparis
Answer:
Antoine Lavoisier died at the age of 50
An impure sample of potassium hydrogen phthalate was titrated to determine the percent composition KHP. What is the percentage of potassium hydrogen phthalate if 2.81 g of the mixture required 35.61 mL of 0.152 mol/L NaOH to reach the end point
For an impure sample of potassium hydrogen phthalate, the percentage of potassium hydrogen phthalate is
m'=39.3%
What is the percentage of potassium hydrogen phthalate if 2.81 g of the mixture required 35.61 mL of 0.152 mol/L NaOH to reach the end point?Generally, the equation for the mol base is mathematically given as
mol base = M*V
mol base = 0.152*35.61
mol base = 5.41272 mmol
In conclusion
mass = mmol/1000*MW
m== 5.41272 /1000*204.22
m= 1.1053 g of KHP
Hence, m'=39.3%
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Which of the following is a reasonable explanation for the effect that stirring or agitation has on the dissolution rate?
A.
The water molecules have more kinetic energy and have a greater chance of interacting with (and dissolving) the potassium iodide.
B.
The water molecules have an increased charge, since stirring removes electrons from the molecules. This increases the chance of a potassium ion being attracted to water.
C.
Stirring converts large amounts of energy into heat from friction and the heat increases the dissolution rate.
D.
Stirring breaks the bonds between water molecules so that they are free to bond with the potassium and iodine ions.
The water molecules have more kinetic energy and have a greater chance of interacting with (and dissolving) the potassium iodide.
What is the effect of stirring on the dissolution rate?Stirring breaks a solute into smaller pieces which increases its surface area as well as its rate of dissolution. Stirring brings unused portions of the solvent in contact with the solute which allows the solute to dissolve faster.
So we can conclude that option A is the right answer.
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what mass of CO2 gas occupies 6.7L at 2 atm and 245k
1. In sheep, a gene with two alleles decides wool color. The allele for white wool is
dominant to the allele for black wool. If two heterozygous sheep mate, what
percentage of the sheep will have white wool? Record your answer as a
percent.
White wool
Black wool
HINT: Create a Punnett square on scratch paper to determine the answer.
This is defined as a variant form of a gene. We were told that allele for white wool is dominant to the allele for black wool and two heterozygous sheep mated.
When we cross Ww and Ww we get WW, Ww, Ww, ww. Since white is dominant then the percentage is 3/4 = 75 percent.
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a
Scientists have observed that the average surface temperature of the Earth has been increasing. This increase has
affected the oceans. Glaciers and ice sheets melt, and water from this melting process becomes part of the oceans.
The increasing temperature of the Earth's surface also warms ocean waters. As a result, the volume of the oceans
expands. These two events affect sea level.
What would happen to sea level if the average surface temperature trend that was observed since the 1960s
continues?
A) Sea level will rise, then will suddenly fall.
B) Sea level will remain the same.
C) Sea level will continue to fall.
D) Sea level will continue to rise.
Please select the best answer from the choices provided
O A
OB
Save and Exit
Next
Submit
Mark this and return
Answer:
D) Sea level will continue to rise
Please, I need this now.
Drag each label to the correct location on the image.
Match each situation to the circuit diagram that represents it.
Answer: if anyone needs it <3
Explanation:
Which list of phases of H2O is arranged in order of increasing entropy
Answer: Solid, liquid, and gas are the three phases of H2O that are listed in order of increasing entropy.
The haphazard motion of water molecules in molecular water gives it the maximum flexibility.
What volume of water is used to prepare a 3.5 M solution if 45 grams of Na2CO3 is used?
Answer:
121.3 ml
Explanation:
Mole wts
Na 22.989 x 2
C 12.011
O 15.999 x 3 total = 105.986
45 grams is 45/105.986 of a mole
45/105.986 in one liter would be .424584 M
.424585 mole / x liter = 3.5
x = .1213 liter = 121.3 ml
4. What is the movement of blood through your blood vessels called?
circulation
digestion
nervous
Answer:
circulation
Explanation:
The movement of the blood through the heart and around the body through the narrow vessels is called circulation which makes up the cardiovascular system.
Answer:
Circulation
Explanation
digestion is the process of breaking down food by mechanical and enzymatic action in the alimentary canal into substances that can be used by the body and its the only one that makes sence
Need help! Will give brainliest & 50 points.
What happens to iron when it reacts with acid?
Answer:
Iron will disolve in acid. The acid eats away at the iron. :)
Have an amazing day!!
Please rate and mark brainliest!!
What are the forms of energy that are transfer from the abiotic factors to the biotic factors and back to the abiotic factors of an ecosystem
Answer:
sunlight, light energy from the sun
Explanation:
energy is transferred from the sun to plants then animal's eat plants
what are the products for the following equation?
ZnBr2 + F2 ->
Answer:
The products to ZnBr2 + F2 -> Znf + Br2
When we balance this equation we get the following:
2ZnBr2 + F2 -> 2Znf + 2Br2
Hope this helps !!!
what is ozen. gas? How is it formed?
[tex]\sf\huge\underline\purple{Ozone\: Gas:-}[/tex]
Ozone, O3, an unstable, blue, diamagnetic gas with a characteristic pungent odor, protects the earth and its inhabitants from intense ultraviolet radiation from the sun.[tex]\rightarrow[/tex]Ozone is an allotropic molecular form of oxygen containing three atoms of oxygen (O3). Ozone O3 is generated through the passage of oxygen O2 through a high voltage potential resulting in the attachment and formation of a third oxygen atom.
[tex]\rightarrow[/tex]The molecular formula for ozone (O3) was established by Soret (1863) by taking the ratio of the change in volumes when O3/O2 mixtures were either heated or exposed to turpentine and cinnamon oil.
Formation:-[tex]\rightarrow[/tex]Ozone is formed when heat and sunlight cause chemical reactions between oxides of nitrogen (NOX ) and Volatile Organic Compounds (VOC), which are also known as Hydrocarbons. This reaction can occur both near the ground and high in the atmosphere.
__________________________________
Hope it helps you:)
Pots A and B both have plain soil, bean seeds, and the same amount of light. Pot B receives more water (see table). After 50 days the plants are measured. Based on the data, which of the following conclusions can NOT be drawn from the data table?
A plant that receives more water will have more mass
The amount of water a plant receives affects its growth
The taller a plant is, the more mass it has
A plant that receives more water will grow t
A. water per day: 20 m/ height: 24cm/ mass: 3.1g B. Water per day: 60 ml/ height: 24cm/ mass: 9.6g
I think that the answer to this question is the third option. These two plants are of the same height but plant B has more mass. So therefore the statement is not true.
If this is a multiple-choice, then I would also select the fourth option along with the third. Plant B received more water, but it is the same height as plant A.
I hope my answer is satisfactory, and that I was of help to you.
-Toremi
Using the notation just described, represent a cell based on the following reaction:
ClO3−(aq)+3Cu(s)+6H+(aq)→Cl−(aq)+3Cu2+(aq)+3H2O(l)
Pt is used as an inert electrode in contact with the ClO3− and Cl− .
Drag the appropriate labels to their respective targets. For neutral species, leave the pink target blank.
The cell notation of the redox reaction between Cu and ClO₃⁻ is:
Cu/Cu²⁺//ClO₃⁻//Cl⁻/PtWhat is a voltaic cell?A voltaic cell or electrochemical cell is a device which produces electricity from chemical reactions occuring within the cell.
The reactions occuring in a voltaic cell are redox reactions.
Oxidation occurs at the anode while reduction occurs at the cathode.
In the given reaction between Cu and ClO₃⁻ as shown below:
ClO₃⁻ (aq) + 3 Cu (s) + 6H⁺ (aq) → Cl⁻ (aq) + 3 Cu²⁺ (aq) + 3 H₂O (l)Cu is oxidized as follows: 3 Cu (s) → 3 Cu²⁺
ClO₃⁻ is reduced as follows: ClO₃⁻ (aq) → Cl⁻ (aq)
The voltaic cell notation is as follows where Pt is used as an inert electrode in contact with the ClO₃⁻ and Cl⁻:
Cu/Cu²⁺//ClO₃⁻//Cl⁻/PtTherefore, the cell notation of the redox reaction between Cu and ClO₃⁻ shows that Cu is oxidized while ClO₃⁻ is reduced.
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What is the name of an isotope with 23 protons and 25 neutrons?
Select one:
Cadmium
Vanadium
Chromium
Manganese
Answer: Vanadium
Explanation:
Question 6 of 10
What does it mean when a reaction is spontaneous?
O
A. The reaction requires added energy.
B. The reaction goes to completion.
C. The reaction occurs rapidly.
O O
D. The reaction happens by itself.
SUBMIT
Answer:
D
Explanation:
Does not require energy ...may be slow or fast....
A(n) reaction is a self-sustaining series of chemical reactions in which the products of one reaction are the reactants in the next reaction.
The reaction which is a self-sustaining series of chemical reactions in which the products of one reaction are the reactants in the next reaction is chain reactions.
What are reactants and products?Reactants are those species which are present at the initial state of the reaction and at the end of the reaction we obtain products.
If in any chemical reactions, reactants are combined for the formation of products and for the further process obtained product will act as reactant and that chemical reactions are known as chain reactions. Because this process continues for long time.
Hence correct option is chain reactions.
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Answer:
chain
Explanation:
edge 2023
which of the following changes different colours in alkalis,acids,and neutral substances?
A red litmus paper
B Blue litmus paper
C universal indicator
D all of the above
two protons are placed 1 mm apart. separately two electrons are placed 1 cm apart. which pair will have greater force between them
Answer:
The protons
Explanation:
The force of attraction/repulsion is indirectly proportional to the square of the distance between...the protons are much closer together and will have a stronger force.
F = k q1q2 / r^2
Distinguish between single and double replacement reactions and give an example of
each.
Answer:
i think this is right!
Explanation:
An example of a single replacement reaction occurs when potassium (K) reacts with water (H2O). A colorless solid compound named potassium hydroxide (KOH) forms, and hydrogen gas (H2) is set free. The equation for the reaction is: 2K + 2H2O → 2KOH + H.
An example of a double replacement reaction is the reaction between silver nitrate and sodium chloride in water. Both silver nitrate and sodium chloride are ionic compounds. Both reactants dissolve into their ions in aqueous solution.
Does gravity give objects their mass
Answer:
No
Explanation:
Mass affects the amount of gravity that acts on an object.
Answer:
Mass is determined by the quantity of matter in a physical object.
Mass is how much space something takes up, while weight is how much an object is acted on by a force because of gravity.
Explanation:
Gravity does not determine the mass of an object. For example, an object on the Moon would weigh less than it does on Earth because of the lower gravity, but it would still have the same mass. This is because weight is a force, while mass is the property that determines the strength of this force.
