Answer:
d) He, Ar, Kr
Explanation:
To have similar chemical properties, elements must belong to the same period on the periodic table.
As a generally periodic trend, elements within the same group, have the same chemical properties.
So, the correct answer choice will draft elements from the same group.
He, Ar and Kr belongs to the group of elements called the noble gases. They are an unreactive group of elements. They are found in the last group on the periodic table. These elements do not readily combine with other elements.Answer:
D
Explanation:
wich atom contains exactly 15 protons
Answer:
phosphorus
Explanation:
15 is the atomic number, so you know phosphorus has 15 protons.
1.) The following is a close view of particle movements. Which state of
matter are you viewing?"
Answer: Gas
Explanation:
Gas. The arrows represent direction. They are moving around in the box extremely fast, and are not compact like a solid or liquid.
What are 3 similarities between physical changes and chemical changes
Answer:
Heat change is involved in both process.
II. Both result in change of state of matter
Explanation:
Physical change substance involves the alteration of physical state of a substance. Chemical change substance involves the alteration of the chemical composition of the substance
In your own words, define the word "potential"
Answer:
1 : the chance or possibility that something will develop and become real There is a potential for injury. 2 : an ability or quality that can lead to success or excellence : promise She has great potential as a musician.
Explanation:
Answer:
potential: possessing or demonstrating the ability to evolve into or become something in the future.
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How do the two desalination processes differ from the atmospheric water generator in terms of where the processes can be used?
Answer:
Water Desalination Processes. Water desalination processes separate dissolved salts and other minerals from water. Feedwater sources may include brackish, seawater, wells, surface (rivers and streams), wastewater, and industrial feed and process waters. Membrane separation requires driving forces including pressure (applied and vapor)
Explanation:
Salinized water cannot be consumed by humans, but it can be converted into freshwater, which has a variety of purposes. Desalination is the procedure, and it is being employed increasingly frequently all over the world to supply people with the freshwater they require.
What is desalination process?Desalination is the procedure used to remove the dissolved mineral salts from water. Currently, one of the most popular methods for obtaining fresh water for use in agriculture or human consumption when applied to seawater.
When seawater evaporation occurs, salt is left behind, and clouds are formed, which eventually result in rain. Da Vinci realised that it was easy to obtain using a still. Aristotle had observed that seawater would evaporate and condense into fresh water.
Seawater desalination was mostly utilised on ships and submarines over the next centuries to supply the crew with fresh water during lengthy voyages. Nevertheless, this method was not widely accessible until the industrial revolution and, more specifically, until the creation of desalination facilities.
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Which statements accurately describe volume? Check all that apply. Volume is a physical property of an object. Volume is measured using a balance. The volume of a solid changes with the shape of the container. One unit of volume is the milliliter. Liquids and solids have constant volumes
Answer:
Liquids and solids have constant volumes
Explanation:
I believe this is the most correct statement
Answer:
Volume is a physical property of an object.
One unit of volume is the milliliter.
Liquids and solids have constant volumes.
Hope this helps <3
Explanation:
If you have 40.0 g HCl and 40.0 g NaHCO3, do you have the same number of moles of each?
They both have a different number of moles
Further explanationGiven
40 g HCl
40 g NaHCO3
Required
moles
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
n = mass : molar mass
So the moles of a compound are affected by its molar mass (inversely proportional)
The larger the molar mass (of the same mass), the smaller the moles
molar mass HCl = 58.5 g/mol
molar mass NaHCO3 = 84 g/mol
mol HCl :
= 40 : 58.5
= 0.684
mol NaHCO# :
= 40 : 84
= 0.476
Most meteors that fall into the Earth's atmosphere burn up before reaching
the ground. Why is this?
what would a bond between potassium and chlorine be
Answer:Potassium react with elemental chlorine, an electron transfers from a potassium atom to a chlorine atom, forming potassium ion and chloride ion. ... As the bond formation between ions, the bond will be ionic. This is because, this process of transfer of electrons from one atom (K) to another atom (Cl).
Explanation:
Which best explains why fungi are often called natural recyclers?
They provide a continuous food resource for many other organisms.
They break down rotting materials and return nutrients to the soil.
They take in large amounts of carbon dioxide, helping to clean the air.
O They are found in nature and have many different practical uses,
They break down rotting materials and return nutrients to the soil.
( They don't do photosynthesis since they are much different from plants)
Answer:
B
Explanation:
1 Which of the following is a true statement about work?
A It measures how quickly an object accelerates incorrect answer
B It measures how much effort is applied over a certain distance incorrect answer
C It measures the change in an object's rate of speed incorrect answer
D It measures how much time it takes to move a massive object incorrect answer
Without a picture I can't answer
please help !! ill mark Brainliest, at least explain how. :(
Answer:
473g
Explanation:
25 + 8(56) = 473
How many molecules are there in 5.9 moles of NaCl?
The number of molecules= 3.55 x 10²⁴
Further explanationGiven
5.9 moles of NaCl
Required
The number of molecules
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
So for 5.9 moles :
= 5.9 x 6.02 x 10²³
= 3.55 x 10²⁴
Where does fission regularly occur and what kind of energy is produced?
1:When wood burns, fission occurs. The energy produced is light and heat.
2:Fission occurs in a nuclear power plant. The energy produced comes in the form of heat.
3:Fission occurs when fossil fuels are burned. The energy can be used to produce electricity.
4:Fission occurs inside the sun. It creates the light and heat that sustain life on Earth.
Answer:
2:Fission occurs in a nuclear power plant. The energy produced comes in the form of heat.
Explanation:
Nuclear fission regularly occurs in nuclear power plants. The energy produced is in form of heat energy which is used for a wide range of purposes.
Nuclear fission is the radioactive decay process in which a heavy nucleus spontaneously disintegrates into 2 lighter ones and several neutrons with the release of a large amount of energy.
This reaction is utilized by nuclear power plants to generate electricity.
Answer:
number 2
Explanation:
Give other person brainly they deserve it.
Please describe the main job of the
digestive system and excretory system in
your own words.
Benjamin Franklin invented the lightning rod as a way to prevent lightning from causing damage to property or people. Use this same idea to construct a device that can protect a person from static charge buildup in their body as they run on a treadmill. Consider that the person wears rubber-soled shoes that rub on the treadmill's running surface, which generates static charges that build up in their body. When the person finishes her workout, she can receive an unpleasant shock when she steps off the treadmill and touches an object that suddenly discharges all of that charge. How can you apply Ben Franklin's idea of a lightning rod to solve this problem? Create a sketch showing how your shock protection system works. Your sketch should be labeled and clearly indicate how the excess static charge in a human body is discharged by the system you design. 12 f(x) (1000) 1 G
Answer:
By 1750, in addition to wanting to prove that lightning was electricity, Franklin began to think about protecting people, buildings, and other structures from lightning. This grew into his idea for the lightning rod. Franklin described an iron rod about 8 or 10 feet long that was sharpened to a point at the end.
Explanation:
There are 122.6L of argon gas in a tank. How many moles is this?
A)
2.76mols
B)
3.25mols
09
1.56mols
D)
5.5mols
There are 5.5 moles of Argon gas in tank
Further explanationGiven
122.6 liters of Argon gas
Required
The number of moles
Solution
Assume at STP
Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol.
So for 122.6 L :
= 122.6 L : 22.4 L
= 5.47 moles ≈ 5.5 moles
anybody know the answer to this ???
Answer:
Answer is C.
Explanation:
I hope it's helpful!
What two terms are used to describe the temperature at which solids and liquids of the same substance exist at the same time?
Answer:
The answer is melting and freezing point.
Explanation:
how much energy was added to the ice between point a and point d?
Answer: 26kj
Explanation:
Just took the test and got it right :D
Which use of biotechnology most benefits North Carolina agriculture? *
O Producing human vaccines
Producing disease resistant crops
O Producing new medicines from bacteria
O Producing enzymes to eliminate pollutants
Residents of North Carolina presently bum 5 billion gallons of imported
Answer:
Producing disease-resistant crops
Explanation:
B. is the Right Answer Hope this helps!
Among all the given options, the correct option is option B. Producing new medicines from bacteria is the most benefits for North Carolina agriculture.
What is biotechnology ?The human genome's sequencing has sparked a biotechnology revolution that will have an impact on every area of our lives, including our environment, diet, and methods of sickness detection and treatment.
Already, biotechnology has raised the standard of living for us. The scope as well as volume of biotechnology's effects will increase in the coming decade as the rate of technological advancements increases.
The use of molecular biology innovations for applications in animal and human health, agriculture, the environment, and speciality biochemical manufacture is the widest definition of biotechnology. Producing new medicines from bacteria is the most benefits for North Carolina agriculture.
Therefore, the correct option is option B.
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What is salinity? (giving you 30 points if you answer it and I give brainlist)
Question 1 options:
a liquid mixture in which the smaller component (solute) is distributed evenly through the major component (solvent)
The concentration of dissolved salt in a liquid
to become incorporated with a liquid in forming a solution
the total amount of salt dissolved in the sea
Answer:
D
Explanation:
Salinity is the saltiness or amount of salt dissolved in a body of water
Answer:
its b trust me i got it right
Explanation:
how much salt will be obtained, neutralizing 11.2 grams. potassium hydroxide and hydrochloric acid? In the meantime, there is no need to worry about it. ”
Answer:
9.0217g
Explanation:
the chemical formula must be after balancingknown as 92.55 (mass) of KOH+HCL will produce 74.55 (mass) of salt, KCLhence, 11.2g of KOH and HCL will produce (x)g of saltIdentify a human activity that impacts the land negativaly. Then describe a positive action that can help reduce the effects caused by the activity
Answer:
Pollution
•The number of trips one takes in a car should be reduced.
•Reduce or eliminate fireplace and wood stove use.
•Burning leaves, trash, and other materials should be avoided.
•Using gas-powered lawn and garden equipment should also be avoided.
In an ecosystem, pollution is a human activity that impacts the land negatively.Minimum use of vehicles and emission of smoke can help reduce the effects caused by the activity.
What is an ecosystem?An ecosystem is defined as a system which comprises of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through means of nutrient cycles and flow of energy.
Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the ecosystem .Living organisms also influence the quantity of biomass which is present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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In the following chemical equation, which are the reactants?
2HF + Mgo MgF2 + 2H20
>
A. 2HF + MgF2
B. 2H+ + Mgo
C. MgF2 + H20
D. MgO + H20
A
B
D
Enzymes are catalysts in living things, including in the molds and bacteria that cause the spoiling reactions that decompose food. Use your knowledge of reaction rates to explain why food doesn’t rot as fast when it is covered and refrigerated. For full credit identify two different factors and explain how they are slowing down the reaction.
I already have that the cold temperature will slow down the reaction, and I'm sure the covering has something to do with it, but I'm not sure what the factor could be. I think my answer has to be one of the factors we learned in class (which are catalyst, concentration, surface area, and temperature).
Answer: Discover ZEISS Solutions
Investigate soft materials like polymers, catalysts, coatings and chemicals to gain a better understanding of their properties. Analyze surface topography, chemical composition, tensile deformation and fracture patterns. Scroll down this page and discover microscopy characterization techniques and solutions from ZEISS enabling you to perform soft materials research in your lab efficiently.
Answer: Discover ZEISS Solutions
Investigate soft materials like polymers, catalysts, coatings, and chemicals to gain a better understanding of their properties. Analyze surface topography, chemical composition, tensile deformation, and fracture patterns. Scroll down this page and discover microscopy characterization techniques and solutions from ZEISS enabling you to perform soft materials research in your lab efficiently.
PLZ help, I'm really behind in school! I will mark brainliest for correct answers!
If the distance between two objects is reduced by a factor of 5, how will Fg be affected?
A. F g decreases to 1/25
B. F g increases by 5 times
C. F g decreases to 1/5
D. F g increases by 25 times
Answer:
Gravitational force is given by:
F=G×
d
2
m×M
Distance between two masses is increased s.t. new distance is D= 5 d
New gravitational force F
1
=F
Let on of the mass is changed to m
1
so as to maintain the same gravitational force.
Answer:
D
Explanation:
F g increases by 25 times
Which graph above shows an object’s acceleration?
a or b
Why did you choose that graph in question above (explain why)
Answer:
A i just did it. And yes i do go to k12
Explanation:
what is the advantage of highly diverse ecosystem
Answer:
Biodiversity boosts ecosystem productivity where each species, no matter how small, all have an important role to play. For example, A larger number of plant species means a greater variety of crops. Greater species diversity ensures natural sustainability for all life forms
Explanation:
If you need 2.5 moles of Rb2Cr7, how many grams do you need?
Answer:
0
Explanation: