To study the population of a species we have to collect many data regarding the factors affecting the growth of the species and those which adversely affects their survival.
What is population monitoring?A key element of conservation practice and policy is species population monitoring, which is defined here as the regular, systematic gathering of data to detect long-term changes in the populations of wild species.
To examine regional, chronological, taxonomic, and methodological patterns in global species monitoring, we built a database of over 1200 programs .
Through standardized web searches, an online stakeholder survey, thorough national searches in a selection of nations, and a review of international biodiversity databases, we discovered monitoring systems.
Most taxonomic groups continue to have scant and poorly coordinated monitoring, and the majority of the data produced are elusive and unlikely to contribute to larger processes for biodiversity conservation.
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PLEASE HELP! NO LINKS!!
WILL MARK BRAINLYIST :)
The Periodic Table of Elements contains many patterns that help explain the characteristics of elements. Choose one pattern you have learned and explain what it tells us about elements.
Answer:
let's look at the far left column of the periodic table. this pattern tells us that these elements are the noble gases. Noble gas is all conduct electricity and they are all odorless and colorless. The Roman numeral above this column means that there is one free electron (valence electron) in the outer shell, except for helium which has two. That's why it's a different color from the rest in the same column.
What is the mass of 7.675 x 1023 atoms C? Answer in units of g.
Answer: 15.3 grams C
Explanation: 1 mole is 6.02x10^23 atoms. We can find the moles of C in 7.675 x 10^23 atoms of C by dividing:
(7.675 x 10^23 atoms C)/(6.02x10^23 atoms C/mole) = 1.275 moles C
The molar mass of carbon is 12g/mole. So the mass of 7.675 x 10^23 atoms is (1.275 moles C)*(12 g/mole C) = 15.3 grams.
how many moles of o2 are needed to react with 2.60 moles c2h2
To determine the moles of O₂ needed, we have to know in what ratio the two reactants react and then use the moles of C₂H₂ in reaction to determine the moles of O₂ needed. We can find this out based on their coefficient in a balanced equation:
Write a Balance Equation
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
Compare the Mole Ratio (Equation Coefficient of C₂H₂ to O₂)
Based on the equation, the mole ratio of C₂H₂ to O₂ is 2 to 5. Therefore for every molecule of C₂H₂, ⁵/₂ C₂H₂ molecules are needed to react.
Find the moles of O₂
Since the number of moles of C₂H₂ = 2.60 moles
then moles of O₂ = 2.60 moles × ⁵/₂
= 6.5 moles∴ 6.5 moles of O₂ is needed to completely react with 2.60 moles of C₂H₂.Which statement is always true when nuclear fusion occurs?(1 point)
The total number of protons and neutrons in each nucleus remains constant.
The number of protons in the resulting nucleus is double that of a starting nucleus.
The combined number of protons and neutrons remains constant.
The number of protons in the resulting nucleus is less than in each starting nucleus.
Use the equation to answer the question.
21H+ 21H→ 42H+energy
Which statement best describes the mass numbers of the atoms in the reaction?
(1 point)
There are two atoms with mass numbers of 2.
There is one atom with a mass number of 2.
There are two atoms with mass numbers of 1.
There is one atom with a mass number of 1.
Which fact is true during a fission chain reaction?(1 point)
The number of freely-moving neutrons increases over time.
The total number of protons will decrease over time.
The total number of protons will increase over time.
The number of freely-moving neutrons decreases over time.
Plsss help
Answer: Which statement is always true when nuclear fusion occurs: The combined number of protons and neutrons remains constant.
21H+ 21H→ 42H+energy
Which statement best describes the mass numbers of the atoms in the reaction? There are two atoms with mass numbers of 2.
Which fact is true during a fission chain reaction? The number of freely-moving neutrons increases over time.
Explanation:
The statement which is always true when nuclear fusion occurs is "the combined number of protons and neutrons remains constant".
What is nuclear fusion?Nuclear fusion is a type of reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles.
The equation 21H+ 21H→ 42H+energy represent that there are two atoms with mass numbers of 2.The true statement during a fission chain reaction is "the number of freely-moving neutrons increases over time".Fission chain reaction is a process in which neutrons released in fission produce an additional fission in at least one further nucleus. This nucleus in turn produces neutrons, and the process repeats.
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help me with this:(((
Answer:
13. A. Kinetic energy increases
14. A. Kinetic energy
15. B. is not transferable
Sorry if I got any wrong, they should be all correct. I tryed.
Chemical properties of earth metals-
Answer:
highly reactive at standard temperature and pressurereadily lose their outermost electron to form cations with a charge of +1Explain and define the angular momentum quantum number without the internet
Answer:
The angular momentum quantum number, l, describes the shape of the orbital that an electron occupies. The lowest possible value of l is 0, and its highest possible value, depending on the principal quantum number, is n - 1.
Please help me! with this ty
Answer:
Neutron
Explanation:
Protons have a positive charge
Electrons have a negative charge
Neutrons have a neutral charge
A scientist discovers an object in the solar system. She describes it as bigger
than an asteroid, smaller than Mercury, and farther from the sun than Neptune.
What kind of object could it be? Explain.
Answer:
Pluto I think it's the ans
. Is it possible to have an oxygen atom with 8 protons and another oxygen atom with 9 protons? Explain.
Answer:
no
Explanation:
changing the number of protons will change the atomic number, and if the atomic number is changed, it will become a different element. if you give oxygen 9 protons, it would no longer be oxygen, it would be fluoride.
I need help with this, I need to know what they mean cause I don’t understand it.
Answer:
The measure of central tendency helps you find the middle or the average, of a data set. The three most common measures of central tendency are the mean, median and mode. The mean is the most frequent value. The median is the middle number in an ordered data set. The mean is the sum of all values divided by the total number of values
Explanation:
Sum of Data (mean) Data in size order (median) Mode
2 +1 + 4+7 + 1 = 15 1, 1 , 2, 4, 7 Most common
15 /5 = 3 value is 1
Mean = 3 Median = 2 Mode = 1
How many moles are in 13.5g of calcium?
Answer:
=0.337mol Ca this is the correct answer :)
Write down the ratio of the atom present in the formula for each of the compound. a) Sodium Carbonate , Na2CO3 b) Glucose, C6H12O6
Answer:
what subject is this? science?
I need help with these questions coz I’m colourblind. Pls help.
Answer:
1. In black 6 dyes were used and in green 3 dyes were used
2. 7 dyes were used overall
3. 2-3 blues were used
4. yellow in brown and orange are similar shade
Not sure about the other image
What is the wavelength of a light with a frequency of 1.7 x 10^17 /s?
Wavelength = Speed of Light ÷ Frequency
= (2.99 × 10⁸ m/s) ÷ (1.7 x 10¹⁷ /s)
= 1.76 ×10⁻⁹ m
The wavelength of a light of frequency 1.7 x 10¹⁷ /s is 1.76 ×10⁻⁹ m.
does freezing involve a chemical reaction
What is the density of this cube?
32 g/cm3
16 g/cm3
64 g/cm3
4 g/cm3
Answer:
32gcm3
so yea i hope this helps u
Answer:
4 g / cm^3
Explanation:
Mass = 32 g
Volume of cube = 2 x 2 x 2 = 8 cm^3
Formula : -
Density = Mass / Volume
Density = 32 / 8
Density = 4 g / cm^3
Complete the following nuclear equation.
Answer:
oxygen-17
Explanation:
sum of the mass numbers and sum of the atomic numbers should be same in the both sides respectively
What is The particle in the nucleus of an atom that has the same mass of protons but no net charge
Answer:
neutron
Explanation:
neutron and proton has approximately the same mass .proton is positively charged but neutron has no charge
please help, I don't understand chemistry at all.
Density is a physical property of a molecule that’s measured as mass per unit volume.
(a) Given that density is usually expressed in the units of g/cm3
, calculate the density of a cube of plastic that
has a mass of 2.331 g and an edge length of 1.500 cm (volume of a cube is V = l^3
).
Answer:0.691 g/cm^3
Explanation: Density tells us how much mass there is per unit volume of a material. If one has a density of 2 g/cm^3, then a 2 cm^3 chuck of it whould have a mass of (2 g/cm^3)*(2 cm^3) = 4 g.
Since the plastic is in the form of a cube, we can calculate it's volume with the relationship V = l^3, where l is the length. (A box would have a volume of lengthx width x height, but for a cube, l=w=h, so the equation becomes V = l^3.
The colume of the plastic cube is (1.5cm)^3 or 3.375 cm^3. Since this cube has a mass of 2.331 g, we can divide that mass by the cube's volume to find density:
(2.331 g)/(3.375 cm^3) = 0.691 g/cm^3
how much phone data do teens use on a daily basis
Answer:
Teens use more phone data then adults because of apps, photos and other things. There is not a certain number for how much data teens use but research says teens use up more than a half of a phone storage. Teens spend from 3-4 hours on phone because of limits but they could spend a whole day.
Explanation:
arsenic has an atomic number of 33 and an atomic mass of 75 amu. how many protons are in the element? help is very appreciated! :)
Answer:
33
Explanation:
as the atomic number states the number of protons in each element hope this helps :)
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. The number of proton is 33 when the atomic number is 33 and atomic mass is 75amu.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Every element has different atomic number.
For a given element
atomic number= number of protons = number of electrons
For given arsenic element atomic number is 33 so according to above relation, we can find the number of protons easily.
atomic number=33
number of protons =33
Therefore, the number of proton is 33 when the atomic number is 33 and atomic mass is 75amu.
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Can we change the ratio between the elements?with explantion
Answer:
What happens when you change the ratio of elements in a compound?
If two elements combine in a different ratio, the result is a different compound. In other words, the same compound will always form from the same elements in the same ratio.
Explanation:
How do you find the ratio of an element?
Convert the mass of each element to moles of each element using the atomic masses. Find the ratio or the moles of each element by dividing the number of moles of each by the smallest number of moles. There are fewer moles of oxygen than any other element, so we will assume one mole of oxygen to establish the ratios.
.
.What is the ratio of the elements?
The atomic ratio is a measure of the ratio of atoms of one kind (i) to another kind (j). A closely related concept is the atomic percent (or at. %), which gives the percentage of one kind of atom relative to the total number of atoms. The molecular equivalents of these concepts are the molar fraction, or molar percent
How dose critical mass play a role in nuclear reaction?
Answer:
How does critical mass play a role in a nuclear reaction?
Explanation:
It is the minimum amount of material needed to start a fission reaction. ... It is the minimum amount of material needed to sustain a fission reaction.
which is the property of nonmetals to evaporate easily?
Answer:
Volatile
Explanation:
Nonmetal are usually volatile, which means it evaporate easily.
what is the name for the type of subatomic particle that is electrically neutral and found in the nucleus of an atom?
answer : Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen.
Why do animals eat other organisms? ILL MARK BRAINLIEST
Animals cannot produce their own energy without consuming other organisms.
Animals eat other organisms to get water.
Animals eat other organisms to provide food for decomposers.
Animals are part of the chain that prevents the plant population from disappearing.
Why are birds considered as consumers?
Birds eat decomposers.
Birds eat plants.
Birds eat other organisms for energy.
Birds make their own energy by absorbing chemicals.
Why do you see some animals in different food chains?
Some animals consume more than one type of organism.
Some animals can jump from one food chain to another depending on the season.
Some animals are a food source for different types of decomposers.
Some animals require to eat more because they are bigger.
Why is it possible that some animals may live side by side?
Some animals may consume the same type of plants.
There is a limited amount of space found in ecosystems.
Some animals may not be in the same food chain.
There is a limited amount of water supply in some ecosystems.
Choose the best statement that explains why do organisms need energy?
Energy is necessary only for hunting.
Energy is necessary for cells to function.
Energy is necessary only to make egg and sperm cells.
Energy is only needed during the daytime.
This are the required answers based on the food chain and ecosystem.
If you have any doubts regarding on my answer. Feel free to share the doubts with me in comments section :D
Answer:Animals eat other organisms — Animals cannot produce their own energy without consuming other organisms.
Birds considered as consumers — Birds eat plants.
We see some animals in different food chain — because some animals consume more than one type of organism.
Some animals may live side by side — There is a limited amount of space found in ecosystems.
The best statement that explains why do organisms need energy — Energy is necessary for cells to function.
This are the required answers based on the food chain and ecosystem.
If you have any doubts regarding on my answer. Feel free to share the doubts with me in comments section :D
Explanation:
do carbon dioxide and water have the same molecular geometry?
Answer:
No, the molrcules of water are different from carbon dioxide
Hope it helps you¯\_(ツ)_/¯
correct me if im worng
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Save the ________ used to extract metals.
Answer:
Save the *minerals* used to extract metals.
au lie
3. What are the two categories of pure substances?
a.
b.
I
C.
d.
e.
f.
g.
h.
i.
j.
k.
1.
b.
m.
pretty sure its d and g
just my opinion