Which element has 5 energy levels and 2 valence electrons?
Answer:
Element 38: Strontium
Explanation:
10161.6 Lanthanum-140 can also emit beta radiation and change into cerium.
Complete the equation showing the decay of lanthanum (La) 140 into cerium (Ce).
Answer:
[tex]\frac{140}{57}La -------->\frac{140}{58} Ce +\frac{0}{-1} \beta[/tex]
Explanation:
Beta emission occurs when a neutron is converted to a proton, an electron and a neutrino. This phenomenon reduces the neutron-proton ratio(N/P).
When a beta emission occurs, the mass number of the daughter nucleus is the same as that of the parent nucleus while the atomic number of the daughter nucleus increases by one unit.
We can see this explanation above in the reaction described in the answer section.
What structure actively moves water through a sponge?
Answer:
Answer is flagella
Explanation:
I hope it's helpful!
plz help me i swear will mark you brainiest :(
Answer:
C. the relative molecular mass of the compound
Explanation:
Like molecular formulas, empirical formulas are not unique and can describe a number of different chemical structures or isomers. To determine an empirical formula, the relative molecular mass of the composition of its elements can be used to mathematically determine their ratio.
1. Four (4) is a coefficient found in which of the following
chemical formula?
a. 4KCN
b. 3K2PO3
C. 6(NH4)2PO4
d. 2KNO3
Answer:
a. 4KCN
Explanation:
Four is a coefficient found in the chemical formula 4KCN.
KCN is potassium cyanides.
A coefficient is a number that is written before a chemical compound. It is usually used to balanced reaction expression.
Chemically such numbers indicate the number of moles or volume of that specie.
Since KCN is the only compound with 4 before it, so, the solution is KCN
Which process is responsible for changing the composition of rock?
erosion
abrasion
chemical weathering
mechanical weathering
Answer:
chemical weathering
Explanation:
Chemical weathering is the process responsible for changing the composition of rocks.
WHAT IS WEATHERING?Weathering is the process by which rocks are broken down into smaller or tiny pieces.
There are different types of weathering namely;
Chemical weatheringMechanical weatheringChemical weathering is the type of weathering that changes the chemical composition of rocks.
Learn more about chemical weathering at: https://brainly.com/question/14426457
define the term valency
Answer:
Valency is the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with
What two things will you consistently do to maintain your mental health?
Answer:
Eat healthy food and exercise daily also undertake good healthcare
There are some special exercises that help to increase brain strength you can do them
HELP ASAP PLEASE!!!!
Answer:
solid objects
cooler to warmer
sitting on a metal chair.
Explanation:
im correcr
Where does nearly all life get its energy from? *
Oxygen
A.Sun
B.Produce
C.Soil
Will is learning about a new kind of plastic used to make models. He learns that infrared light is absorbed by the plastic, X-ray light is transmitted through the plastic, and visible light is reflected off the plastic. Will wonders if the plastic will melt if he shines the lights on it. Can light cause the plastic to melt? Why or why not? Does it matter what type of light he shines on the plastic?
Answer: Yes, I think light can cause the plastic to melt, as long as the energy from the light is absorbed by the plastic.
Explanation:
Visible light will not melt the plastic because the energy does not pass through the plastic, it reflects off ensuring that the plastic does not absorb the energy. X-ray light is transmitted through the plastic, unlike the visible light, but the energy still isn't absorbed by it. The infrared light is the only one left, it is absorbed by the plastic allowing it to change and melt the material, unlike the visible and x-ray lights.
The plastic will melt if the energy from the light is absorbed by the plastic.
What are Electromagnetic radiations?These are forms of electromagnetic waves which propagate through space
and carry electromagnetic radiant energy. Examples include:
X-rayVisible lightInfrared etcVisible light and X-ray light won't melt the plastic as a result of the energy
not being absorbed whereas in the case of Infrared lights, the energy is
absorbed which will led to the melting of the plastic.
Read more about Electromagnetic radiation here https://brainly.com/question/1293367
What is the formula for tuesdium blackide?
Answer:
SF722
Explanation:
Undecylenic Acid
4.Explain how the percentages of nitrogen, oxygen, and carbon dioxide in the Earth's atmosphere today have changed from the Earth's early atmosphere.
Answer:
The new estimates suggest that atmospheric oxygen levels have fallen by 0.7 percent over the past 800,000 years. The scientists concluded that oxygen sinks processes that removed oxygen from the air were about 1.7 percent larger than oxygen sources during this time.
Hope it helps:D
does anyone know the answer to #6
6. What is the charge on an atom that has gained one electron?
If an atom has an equal number of protons and electrons, its net charge is 0. If it gains an extra electron, it becomes negatively charged and is known as an anion. If it loses an electron, it becomes positively charged and is known as a cation.
I looked it for you, hope that helped <3
Which is a benefit of genetically modified foods?
A.When foods are genetically modified, they are always resistant to disease and drought.
B.When foods are genetically modified, they no longer need to be studied.
C.The cost of research is included in the cost to the consumer.
D.The cost of food will decrease, and the quality of food will increase.
Answer:
Some benefits of genetic engineering in agriculture are increased crop yields, reduced costs for food or drug production, reduced need for pesticides, enhanced nutrient composition and food quality, resistance to pests and disease, greater food security, and medical benefits to the world's growing population.
A exothermic reaction requires energy, produces energy, is energy-neutral.
Answer:
An exothermic reaction is going to produce energy.
Explanation:
rAn exothermic reaction is going to release energy meaning that your ending product will be negative. However if it is an endothermic reaction, it is going to absorb energy/requires energy, and will have an ending product that is positive.
Your friend says that she heard about a special type of ink that is only visible when it is out in the sun. Can light from the sun cause this ink to become visible?
Yes, the ink can take in energy from the light, causing it to become visible.
Answer:yes it can
Explanation:
Would there be any differences in the amount of salt that dissolved in the warm water versus the cold water?
Answer: yes, warm water devolves the salt quickly and cold water keeps the salt good for a while.
Explanation:
Which is TRUE about intermolecular
forces?
They are STRONGER than a chemical
bond
They are WEAKER than a chemical bond
Answer:
They are Weaker than a chemical
bondcorrected by the one in the comment section
help me please, with both number 2 and 3, first one to answer gets a brainliest!
Answer:
2) a
3) c
explanation:
both gain from the relationship in number 2
while in number 3 one gains and one is hurt
What is a physical property of water? *
not flammable
reacts with sodium
liquid at room temperature
Explain the origin of plate material (including the ocean floor and continents)
Answer:
the process involves plates being dragged into the mantle at certain points and moving away from each other at others, in what has been dubbed 'the conveyor belt'.
Plate tectonics depends on the inverse relationship between density of rocks and temperature.
At mid-oceanic ridges, rocks are hot and their density is low, making them buoyant or more able to float. As they move away from those ridges they cool down and their density increases until, where they become denser than the underlying hot mantle, they sink and are 'dragged' under.
But three to four billion years ago, Earth's interior was hotter, volcanic activity was more prominent and tectonic plates did not become cold and dense enough to spontaneously sank.
The movement of the seafloor away from spreading ridges caused by topographic variations (the ridge is a topographic high) and density changes in the crust (density increases as newly-formed crust cools and moves away from the ridge).
What is the origin of plate movement?The movement of the seafloor away from spreading ridges caused by topographic variations (the ridge is a topographic high) and density changes in the crust (density increases as newly-formed crust cools and moves away from the ridge).Geologists have discovered a new theory for the origin of plate tectonics. Researchers believe it was triggered by the spread of early continents and then evolved into a self-sustaining process.The continental crust is made up of granitic rocks, which are composed of relatively lightweight minerals like quartz and feldspar. The oceanic crust, on the other hand, is made up of basaltic rocks, which are much denser and heavier.To learn more about : Seafloor
Ref : https://brainly.com/question/870586
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What hold elements together to form compounds
Answer:
Chemical bonds are forces that hold elements together. it can be either covalent or ionic bonds that are these chemical bonds.
(03.03 LC)
Which of the following describes a covalent bond?
Answer:
It is the sharing of electrons between atoms with an electronegativity difference below 1.7.
Explanation: Covalent bond is the bond which is formed with the sharing of the electrons between the two atoms which are taking part in the bond.
Answer: Covalent bond, in chemistry, the interatomic linkage that results from the sharing of an electron pair between two atoms. The binding arises from the electrostatic attraction of their nuclei for the same electrons.
Explanation: A covalent bond forms when the bonded atoms have a lower total energy than that of widely separated atoms.
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What can you infer is causing the cryosphere to change? Give two reasons. Explain why.
Answer:The crayosphere- it is the portion of the Earth's surface where water is in solid form for at least one month of the year..-has been shrinking in response to climate warming.The important outcome,however,is the change and the response the human social system (infrastructure,food ,water,recreation) will be have to that change...
I hope It helps
Answer:
50
Explanation:
mookie betts 50 is goated no cap
I NEED UR HELP WITH THIS ILL MARK U AS BRAINLIST/5 star and a like. Just answer the ones u know I’ll still mark u as brainlist and also put numbers on the side so I know which is which, let’s see who can answer em with full sentences.
1. A potassium atom contains 19 protons:
A) how many electrons are present in a potassium atom? Justify your answer.
b) What is the electronic configuration of a potassium according to the Bohr model?
C) how many electrons are in the valence shell of a potassium atom?
D) what could be done to potassium atoms to make electrons jump into the fifth shell?
a) There are 19 electrons in a potassium atom. I don't really know how to explain it. I've been told that the number of protons and electrons are the same.
b) There are two electrons on the first shell, 8 on the second, 8 on the third, and 1 one on the fourth shell, which totals 19.
c) There is one electron in the valence shell.
d) I don't know what to do for this one. Sorry.
a) 19 electrons are present, the same number as the protons
b) [Ar] [tex]4s^{1}[/tex] (condensed)
c) theres one valence electron in a potassium atom
d) they could be heated
How many joules of heat are absorbed when 73 g water are heated from 30*C to 43*C? *
Answer:
3966.82 J
Explanation:
q=sm∆T
q=73×13×4.18
the specific heat for water is 4.18
Answer:
[tex]\boxed {\boxed {\sf 39,668.2 \ Joules}}[/tex]
Explanation:
We are given the mass and change in temperature, so we must use this formula for heat energy:
[tex]q=mc \Delta T[/tex]
The mass is 73 grams. Water's specific heat is 4.18 J/g × °C. Let's calculate the change in temperature
ΔT= final temperature - initial temperatureΔT= 43 °C - 30°C ΔT= 13 °CNow we know all the variables and can substitute them into the formula.
[tex]m= 73 \ g \\c= 4.18 \ J/g* \textdegree C \\\Delta T= 13 \ \textdegree C[/tex]
[tex]q= (73 \ g )(4.18 \ J/g*\textdegree C)(13 \textdegree C)[/tex]
Multiply the first numbers together. The grams will cancel.
[tex]q= 3051.4 \ J/\textdegree C (13 \textdegree C)[/tex]
Multiply again. This time, the degrees Celsius cancel.
[tex]q= 39668.2 \ J[/tex]
39,668.2 Joules of heat energy are absorbed.
I'LL GIVE BRAINLIEST PLEASE HELP. I need to give two arguments as to why climate change is not linked to greenhouse gases and I have no idea what to put.
As greenhouse gas emissions from human activities increase, they build up in the atmosphere and warm the climate, leading to many other changes around the world—in the atmosphere, on land, and in the oceans.
Hope it helps:D
I NEED HELP NOW!!!!!!!!!!!
Which ball (frame A or B) is moving with a higher velocity when it strikes the ground, and which ball has the greatest kenetic energy?
A: the ball in frame A had the highest velocity, and the ball in frame B has the highest kinetic energy
B: the balls in frame A and B have the same velocity, while the ball in frame B had the highest kenetic energy
C: the ball in frame B has the highest velocity and the highest kenetic energy
D: the ball in frame A has the highest velocity and the highest kenetic energy
A: the ball in frame A had the highest velocity, and the ball in frame B has the highest kinetic energy