The atomic number of krypton is 36. If the mass number of a krypton atom is 84, which table shows the number of subatomic particles inside and outside the nucleus of the krypton atom?
Answer:
A
Explanation:
In the planetary model, there is a nucleus with protons and neutrons, surrounded by orbits with electrons. In the krypton representation, there are 84 subatomic particles inside the nucleus and 36 outside.
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The representation of an element includes a superior number that indicates the massic number, and an inferior number that indicates the atomic number.
We need to know that every atom is identified by its number of protons and neutrons. So,
Representation ⇒ ᵃ X ₀
Where
• X is the element
• a is representing the massic number, which is defined as the sum of the number of protons and the number of neutrons.
• z is the atomic number, which is the number of protons ⇒ represented as 0 above
In electrically neutral atoms, the number of protons equals the number of electrons. This means that the atomic number also indicates the number of electrons.
We will call n to the number of neutrons, which equals a - z
So, what you need to know is that
• Nº of protons = Atomic number → z
• Nº of neutrons = Massic number - Atomic number → n = a - z
• Nº of Electrons = Nº of protons = Atomic number → z
When representing these atom structures using the planetary model, there must be a nucleus surrounded by orbits.
In the nucleus there are protons and neutrons. In the orbits, there are electrons in different energetic levels.
• Nucleus → Protons + Neutrons → circle indicating number of P⁺ + N⁰
• Orbits → Around the nucleus → Following the energy levels
The energy levels indicate how many electrons, e⁻, maximum must be placed per level -orbit- → seven levels
In the exposed example, we have,
Element ⇒ KryptonAtomic number, z ⇒ 36 ⇒ Nº of protonsMassic number, a ⇒ 84 ⇒ Nº of neutrons + Nº protonsWe know that the atomic number = number of protons = number of electrons, so
• Nº of neutrons = Massic number - Atomic number → 84 - 36 = 48
• Nº of Electrons = Nº of protons = Atomic number → 36
According to the framework, we might assume that in a planetary model representation, there are 84 subatomic particles inside the nucleus, and 36 subatomic particles outside.
• Inside the Nucleus → Protons + Neutrons → 48 + 36 = 84
• Outside the nucleus (Orbits) → Electrons → 36
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A wave has a frequency of 50 Hz and a wavelength of 10 m. What is the speed of the wave?
Answer:
500 m/s
Explanation:
Velocity (v) = wavelength (λ) x frequency (f)
V = 10 x 50
V = 500 m/s
True or False: Animals that eat meat benefit from plants.
Answer:
True
Explanation:
The animals they eat most likely eat (or eat something that eats) plants, making them a larger meal. If there were no plants, the wouldn't be herbivors, and without herbivors, no carnivors
Answer:
False
Explanation:
No animal is benefit from a plant not a Animal that eats meat anyway.
Animals that eat plants exclusively are herbivores, and animals that eat only meat are carnivores. When animals eat both plants and meat, they are called omnivores.
Which organisms contain chloroplasts to help with food production?
which organelle plays no role in the production of or utilization of energy in the cell?
Answer:
Mitochondria...!
Explanation:
Because it is known as the power house of the cell...!
You want to know if feeding rabbits corn is better for their growth than the normalfed pellets that they eat. You have 20 rabbits on which to perform your experiment
what is the iv and dv for this
Answer:
The IV is the corn because that is what you are changing.
The DV is the growth of the rabbit because that is what you are measuring.
Cells need energy to perform all of their functions. Where in the cell is the energy made?
Answer:
mitochondria
Explanation:
which organisms have many cells that are grouped together in tissues
Answer:Multicellular organisms, like people, are made up of many cells. Cells are considered the fundamental units of life. The cells in complex multicellular organisms like people are organized into tissues, groups of similar cells that work together on a specific task.
Explanation:
Answer:
multi cellular
Explanation:
I’ll mark brainliest
1) There is a glass of soda water sizzling do you think the oxygen atoms in the water will still exist as oxygen a million years from now
2) a glass of soda water water is sizzling do you think the water molecules will exist as water molecules in a million years
HELP PLEASE! fill in the blanks
Answer:
infectious agents/germs, immune system, circulatory system
Explanation:
I need this!! It’s important!!!!
sWhich statement describes two organ systems working together to deliver nutrients to cells?
A. The excretory system removes excess nutrients from blood as it
makes urine.
B. The blood absorbs the nutrients that the digestive system obtains
from food.
C. The respiratory system transfers oxygen removed from nutrients
to the blood.
D. The molecules of important nutrients are made from food in the digestive system
Answer:
lol which one is it......
Explanation:
What describes the components of a coral reef community?
Which best describes unicellular organisms, such as amoebas?
Answer:
d probably not
Explanation:
What should I write about in an essay about The Arctic Biome and Desert Biome?
Hypertonic solutions: Have a higher, lower, or same concentration of water
Answer:
A hypertonic solution is one which has a higher solute concentration than another solution.
Explanation:
List the name of each taxon group in order starting with Kingdom in the space below.
Answer:
Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species.
Explanation:
As you have observed, animal hairs usually have a large medulla composed of air-filled compartments. These air-filled compartments are present for a reason and can actually help hair do its job better. Describe one reason that might explain why having a hair made of air filled compartments could be helpful to an animal.
PLEASE HELP
Answer:
to provide insulation
Explanation:
The medullary index is the proportion of the diameter of the hair medulla in regard to the diameter of the entire hair: The equation to calculate the medullary index is medulla diameter/hair diameter. In animals, the hair medulla is generally thicker compared to humans (medullary index approximately 0.5 and 0.33, respectively). The thicker the diameter of the hair medulla, the better is the insulation.
Which two planets are most similar?
A. Jupiter and Venus
B. Mercury and Saturn
C. Earth and Mars
D. Uranus and Mars
Answer:
Earth and Mars because NASA scientists have found Similarities between the two and think it is possibly habitable.
Ex: Water was found on Mars
Answer:
Venus and Mars
Explanation:
If there was a section of hot air surrounded by cold air what would happen to the warm air?
Will give brainliest!
a. it would rise
b. it would sink to the ground
c. it would dissipate
d. it would evaporate
Answer:
Warm air would rise as it is less dense than cold air
Explanation:
What chemical bond is responsible for the existence of the sugar-phosphate backbone of DNA
Answer:
Phosphodiester bonds
Explanation:
Answer:
The answer is phosphodiester bond.
Explanation:
The sugar phosphate backbone is an important stuctural component of DNA. It consists of 5-carbon deoxyribose sugars and phosphate groups. These sugars are linked together by a phosphodiester bond, between carbon 4 of their chain, and a CH2 group that is attached to a phosphate
12 Which pair of organisms would most likely compete
for food?
A. cow and chicken
B. snake and hawk
C. mushroom and shrub
D. brown bear and salmon
All of the universe’s original supply of hydrogen came from?
1) The space-time continuum
2) A parallel universe
3) The Big Bang
4) black holes
Can someone please help me???❤️
Answer:
am so sorry I don't know it but plz give me brainiest
Can anyone help me with any of these questions? Please
Answer:
peanut butter - reduces risk of heart disease and lowers cholesterol
egg - protein; cell repair and growth
Two students completed an experiment to determine if pesticide use at local farms was causing fish kills in a local pond. The steps of the experiment are listed below. Select one location to collect water samples in the pond. Collect a 5-mL water sample at 8 am for two days. Measure the amount of pesticide present in each sample using the same measurement tools. After analyzing their data, the students conclude that pesticide runoff from farms is not causing the fish to die in the pond. Which of these statements best describes why their conclusion is not reliable? The pesticide measurements were the dependent variable. The samples were collected at different times. The samples were only collected for two days. The time of sample collection was not an independent variable.
Answer:
The pesticide measurements were the dependent variable
Explanation:
According to this question, an experiment to determine if pesticide used at local farms was causing fish kills in a local pond was conducted by two students. They followed the following steps:
- Select one location to collect water samples in the pond.
- Collect a 5-mL water sample at 8 am for two days.
- Measure the amount of pesticide present in each sample using the same measurement tools
However, after analyzing the data, they concluded that "runoff from farms is not causing the fish to die in the pond". The students' conclusion is not reliable because THE PESTICIDE MEASUREMENTS WERE THE DEPENDENT VARIABLE.
Note that, the dependent variable in an experiment is the measured variable while the independent variable is the manipulated variable. In this case, the students ought to measure the death RATE OF FISH KILLS as the dependent variable instead. The PESTICIDE is the independent variable of the experiment not dependent variable. This was the reason for the unreliability of the conclusion.
Identify minerals extracted in Haiti
and describe what is done with
them.
Answer: Haiti is mainly know for their minerals! the main minerals extracted are: cooper, silver, and GOLD. Haiti has many many gold farms, markets, etc. HOWEVER this is a very poor area, as people here live off of only about 2 dollars per day. They could take this wealth and put it towards the people, roads, and construction, as they had an earthquake that killed many many people, and destroyed much. If you mean what they do with gold, they take the gold from farms, and mine it underground. They then sell it for money as this is a poor area as said before!
Explanation: I hope this helps! please let me know and have a great night! :)
The movement of water through a plant is caused by
Answer:
The bulk of water absorbed and transported through plants is moved by negative pressure generated by the evaporation of water from the leaves (i.e., transpiration) — this process is commonly referred to as the Cohesion-Tension (C-T) mechanism.
Explanation:
The muscles of a tired jogger begin to undergo lactic acid fermentation. As a result, the jogger is most likely to
A) absorb more oxygen with each breath
B) release less carbon dioxide with each breath
C) experience an increase in blood pH
D) experience a “burning” sensation in the muscles
Answer:
D: experience a “burning” sensation in the muscles
Explanation: Based on the information in the lesson, this option makes the most sense.
"When lactate builds up, the blood’s pH drops and the muscles fatigue. This is why you may feel your muscles "burn" from the buildup of lactic acid."
In the given scenario, the jogger will experience a “burning” sensation in the muscles. The correct option is D.
What is muscle fatigue?Muscle fatigue is the loss of a muscle's capacity to create force. It can be caused by strenuous exercise, but abnormal fatigue can also be caused by impediments to or interference with the various stages of muscle contraction.
When lactate levels rise, the pH of the blood falls and the muscles fatigue. That's why individuals may feel their muscles "burn" as lactic acid builds up.
Thus, the correct option is D.
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Which of the following correctly identifies a difference between mitosis and meiosis?
Mitosis results in two diploid daughter cells; meiosis results in four haploid daughter cells.
Mitosis results in four diploid daughter cells; meiosis results in two haploid daughter cells.
Mitosis results in one diploid daughter cell; meiosis results in four haploid daughter cells.
Mitosis results in two diploid daughter cells; meiosis results in one haploid daughter cell.
Answer: The answer is A as mitosis will create 2 daughter cells while meiosis will create 4
Explanation:
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Explain the changes in the whales skeletons during the transition in habitat according to the theory of natural selection. Will mark brainliest.
Answer:
Legs are better for things such as walking, while it’s the oppostite for fins and tails. Those are better used for swimming. Early whales didn’t have tails and fins, so their skeletons adapted into fins and tails so they could move around better in the water since that is where they spent most of their time. In conclusion, skeletons generally adapt to a form that best suits the animal.
Explanation:
According to natural selection, early whales didn’t have tails and fins, so their skeletons adapted into fins and tails so they could move around better in the water.
What do you mean by natural selection?Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
Natural selection is the process through which populations of living organisms adapt and change. Individuals in a population are naturally variable, meaning that they are all different in some ways.
There are four principles at work in evolution—variation, inheritance, selection and time. These are considered the components of the evolutionary mechanism of natural selection.
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