law of conservation of matter
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1 How do scientists mfasure population and changes in
2 What causes populations and ecosystems to remain stable or to
change over time?
3 What factors affect populations within an ecosystem?
4 How do modest or drastic changes in ecosystems affect ecosystem
stability?
Answer:
1.Ecologists often estimate the size and density of. populations using quadrats and the mark-recapture method.
2. The two key components of ecosystem stability are resilience and resistance.
3.The availability of abiotic factors (such as water, oxygen, and space) and biotic factors (such as food) affect population
4. When the climate is changing in the colder direction it effects the planet in the opposite way than it does when it is changing in the warmer direction. Ad nauseam the contemporary, it’ll keep getting hotter and at a greater rate so the ecosystem is going to die.
identify two ways recycling can reduce energy use?
If the molar mass of aluminum chloride was actually 400 g/mol, what would the molecular formula of aluminum chloride be?
Answer:
3AlCl₃
Explanation:
molar mass of aluminum chloride AlCl₃ is 133.33 g/mole
133.33 times 3 is 400
put 3 in front of AlCl₃
3AlCl₃
https://study.com/academy/lesson/aluminum-chloride-formula-molar-mass-decomposition.htm
The representative particle for gaseous nitrogen is the ____.
Answer:
The representative particle for gaseous nitrogen is theMolecule.
The common functions of all cells include:
A reef which hugs the shore?
fringing reef..........
What is the ph of a 0.00043 molar solution of lithium hydroxide (lioh)?
Answer:
pH = 10.63.
Explanation:
Recall that lithium hydroxide (LiOH) is a strong base and hence dissociates completely into Li⁺ and OH⁻ ions.
Therefore, the concentration of OH⁻ ions is equivalent to the concentration of the base.
Find pOH:
[tex]\displaystyle \begin{aligned} \text{pOH} & = -\log[\text{OH}^-] \\ \\ & = -\log(0.00043) \\ \\ & = 3.37 \end{aligned}[/tex]
Using the relationships between pH and pOH, hence determine pH:
[tex]\displaystyle \begin{aligned}\text{pH} + \text{pOH} & = \text{p}K_w = 14.00 \\ \\ \text{pH} & = 14.00 - 3.37 \\ \\ & = 10.63\end{aligned}[/tex]
In conclusion, the pH of the solution is about 10.63.
How many grams of CO₂ gas would occupy 33.7 L of volume at a temperature of
-22.2°C and a pressure of 990 mm Hg?
1.3atm
Let's see
moles of CO_2
PV=nRTn=PV/RTn=990(33.7)/(251.8)(8.314)n=15.9molMass of CO_2
Molar mass×n15.9(44)699.6gRadiocarbon dating can be used to determine the age of a fossil because the amount of carbon-14 found in the fossil...
a. increases steadily over time.
b. decreases steadily over time.
c. is unaffected by time.
d. remains the same for the first 10 years, and then rapidly decreases.
Answer:
B
Explanation:
Carbon-14 will steadily decrease in a dead organism. Fossils are no different. Sense it's dead already, it will still be getting rid of the last bit of carbon-14 it has in a steadily way.
this fossil is evidence that insects lived on earth long ago
which of these modern insects is most likely to be the closest relative of the insect in the fossil ?
Answer:
c.
Explanation:
The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old, but the insect identity of the fossil has been contested. Global climate conditions changed several times during the history of Earth, and along with it the diversity of insects.
Answer:C
Explantion:This is The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old
based on location on the periodic table, which metal is likely to be less reactive than both strontium and sodium?
Answer:
Magnesium is likely to be less reactive than both strontium and sodium
Answer:
The answer is Magnesium (Mg)
Please answer my questions. I really need them soon. I will post the links for other questions in the comments.
Explanation:
option option B is the correct answer of given statement helium-4(He)=2
the planet saturn rotates much more rapidly than earth. this would affect the length of saturn's...
The planet Saturn rotates much more rapidly than earth, this would affect the length of Saturn's day and night.
How day and night occur?Day and night occur on any planet due to the rotation of the planet in its own axis with respect to the position of the sun.
As speed of planet Saturn is much more as compared to the speed of planet Earth. So occurring of day and night in the Saturn takes place faster as compared to earth.
Hence, length of day and night is get affected due to the fast movement.
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Which is not a conjugate acid-base pair?
Question 1 options:
H3O+ and H2O
H2O and OH-
NH3 and NH2--
NH4+ and NH3
HNO2 and H2O
Answer:
Explanation:
''A conjugate acid is formed when a proton is added to a base, and a conjugate base is formed when a proton is removed from an acid.''
In a conjugate acid-base pair, only difference between molecules is the amount of ''H''
One molecule must have 1 more H
in the last example HNO2 and H2O, difference is not only the H amount also H2O doesn't have N. So we can't say they are conjugate acid-base pair.
Which substance has the highest flow rate? *
water
honey
ketchup
mayo
I NEED HELP ASAP!!!!!!!!!!!!
WITHIN THE HOUR
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-0)
2H2(g) + O2(9) - 2H20(9)
How many liters of Hy are required to form 5 moles of H20 at STP?
)
A)
)
11.2 liters
B)
22.4 liters
44.8 liters
D
112 liters
Now
At STP any gas weighs 22.4L
Volume of H_2
22.4+(5)112LThree elements, A, Q, and Z, have the molar masses indicated in the table below. Given a compound with a composition of 15.66% A and 84.34% Z by mass, what is the empirical formula of this compound? Remember to enter subscripts as normal numbers (ie H2O is entered as H2O) and to enter elements in the same order they were given.
element symbol molar mass
A 15.45 g/mol
Q 20.05 g/mol
Z 41.62 g/mol
The empirical formula of the compound containing 15.66% A and 84.34% Z as given from the question is AZ₂
Data obtained from the questionA = 15.66%Z = 84.34%Empirical formula =?How to determine the empirical formulaDivide by their molar mass
A = 15.66 / 15.45 = 1.014
Z = 84.34 / 41.62 = 2.026
Divide by the smallest
A = 1.014 / 1.014 = 1
Z = 2.026 / 1.014 = 2
Thus, the empirical formula of the compound is AZ₂
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4 Identify Give an example of a physical change and an example of a chemical change.
Answer:
Answer below
Explanation:
Physical changes dont change the chemical makeup of an object. An example would be to tear a piece of paper. Tearing the paper doesnt change how the paper was made chemically
Chemical changes on the other hand do change the chemical makeup of an object. An example of a chemical change would be to bake a cake. The reason being that the chemical makeup of the cake batter is changed so that the actual cake is formed.
Why knowing the density of water important to humans or society?
Answer:
it allows us to determine what substances will float and what substances will sink when placed in a liquid.
If a radioactive sample starts with 100 g, how many grams of the original substance will be left after 5 half-lives? Please show all work.
Answer:
3.125g
Explanation:
100/2
50 1
50/2
25 2
25/2
12.5 3
12.5/2
6.25 4
6.25/2
3.125g 5
Distinguish between boiling, melting, and sublimation
Answer:
Boiling: The process of conversion from liquid to gas on heating is called boiling.
Example: Water on heating turns into water vapour.
Melting: The process of conversion from solid to liquid at room temperature is called melting.
Example: Ice cream melting at room temperature.
Sublimation: The Conversion of solid to gas directly is called sublimation.
Example: Camphor, Dry ice
Explanation:
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Others would be the formation of precipitate, the release of energy, or change in odor.
The option that would lead to the formation of precipitation, release of energy or change in color is : Chemical change
Characteristics of Chemical changeChemical changes leads to the formation of precipitate in the form of bubbles, release of energy or change in color for example :
Rusting of Iron : As Iron rusts the color of the Iron will changeBoiling of liquid : As water or any other form of liquid boils the precipitate forms in the form of bubbles and energy in the form of heat is given offHence we can conclude that The option that would lead to the formation of precipitation, release of energy or change in color is : Chemical change
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Imagine that the human population continues to increase, but we don't monitor or implement strategies to minimize our impact on the blue crab population.
Construct an argument supported by evidence for how increases in human populations impact the consumption of natural resources. In your answer, be
sure to include:
• the relationship between human populations and the consumption of resources
• a prediction of how the blue crab population would change with an increasing human population
evidence from the resources explored during the lesson
scientific reasoning
Answer:
The Explanation
Explanation:
:i imagine less blue crabs ngl
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The base Ba(OH)2 neutralizes the acid H2SO4 according to the equation below. What salt is produced?
H2SO4 + Ba(OH)2 -->
A. BaSO4
B. BaH2
C. BaH2S
D. BaO4
Answer:
According to the equation below salt is produced by BaH2s
Answer:
I think b is the correct answer
A bat flew directly toward its cave at a constant velocity for 0.4seconds. It flew 80 centimeters in that time. What was its velocity?
Answer:
Frequency of the ultrasonic sound, f=1000kHz=10
6
Hz
Speed of sound in air, V
a
=340m/s
The wavelength (λ
r
) of the reflected sound is given by the relation:
λ
r
=V/f
=340/10
6
=3.4×10
−4
m.
(b) Frequency of the ultrasonic sound, f=1000kHz=10
6
Hz
Speed of sound in water, V
w
=1486 m/s
The wavelength of the transmitted sound is given as:
λ
r
=1486/10
6
=1.49×10
−3
m.
The diagram below shows two substances. What name is given to bond X?
Answer:
single covalent bond
Explanation:
The bond formed between two atoms each sharing one electron is called single covalent bond
The figure 1 is the structure of diamond. The type of bond in diamond is covalent sp³ bond. DIamond exists in hexagonal arrangement of carbon atoms.
What is allotrope?Allotropes are substances formed from a single elements with different number in various size and shape. Carbon exhibit catenation property which means it can forms chains with other carbon in any large number.
The allotropes of carbon are diamond, graphene and fullerene. Diamond is hexagonal arrangement of carbons atom bonded covalently in sp³ hybridisation.
In graphene as shown in the second figure, bonded carbons atoms are arranged as layers where carbon is in sp²hybridisation. In the case of fullerenes, there are both hexagonal and pentagonal rings adjacent to each and are formed by 60-70 carbons.
In all these allotropes, the bond type between two carbons atoms is covalent. Covalent bond is formed by sharing of electrons between the two atoms.
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Type the correct answer in the box. express your answer to three significant figures. the gas inside a large engine cylinder initially has a pressure of 105 kilopascals and a volume of 2.031 liters. if the gas is compressed at constant temperature to a volume of 0.356 liter, what is its new pressure? the pressure of the compressed gas is kilopascals.
The new pressure of the gas would be 599.03 kilopascals
Boyle's lawsBoyles postulated that the pressure of any gas would be inversely proportional to its volume if the temperature of the gas remains unchanged.
Mathematically: P1V1 = P2V2
In this case, P1 = 105 kilopascals, V1 = 2.031 liters, V2 = 0.356 liters.
P2 = P1V1/V2 = 105 x 2.031/0.356 = 599.03 kilopascals
Thus, the new pressure will be 599.03 kilopascals.
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Answer: 599
Explanation:
cuz i got the answer right on the test
Amino acids are monomers for which biochemicals? nucleic acids polysaccharides lipids polypeptides
Answer:
polypeptides in other words proteins.
Amino acids are monomers for polypeptides. Therefore, the correct option is option D.
The chemical substances known as amino acids are what make up proteins. They are crucial for the development, upkeep, and repair of our body's cells and tissues. The distinctive structure of amino acids, which consists of a core carbon atom joined to an amino group, a carboxyl group, a hydrogen atom, and a side chain known as the R-group that varies between different amino acids, is what makes them stand out from other compounds. There are 20 different amino acids that are frequently present in proteins, each of which has a unique configuration of atoms in its R-group.
Therefore, the correct option is option D.
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How do intermolecular forces among entities in an ideal gas compare to those among entities in a real gas
Answer:
An ideal gas has identical particles of zero volume, with no intermolecular forces between them. The atoms or molecules in an ideal gas move at the same speed. Almost all gases obey the gas laws within a limited range of pressures and temperatures.
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