Answer:
When an organism lives in a certain environment there is a process called natural selection. Natural selection ensures that the organisms of a species with the best traits suited for an environment will reproduce and pass on those traits to the offspring.
Explanation:
The theory of natural selection was studied by Charles Darwin in The Origin of Species by Means of Natural Selection if you need more information.
PLEASE HELP "Which of the following substances would have the lower concentration of hydrogen ions ?"
A sample of oxygen gas occupies a volume of 229.5 mL at 762.7 torr pressure. What volume in mL will it occupy at 704.5 torr pressure?
Answer:
248.4 mL
Explanation:
In order to answer this problem we can use Boyle's law, which states that at a constant composition:
P₁V₁ = P₂V₂Where in this case:
P₁ = 762.7 torrV₁ = 229.5 mLP₂ = 704.5 torrV₂ = ?We input the data:
762.7 torr * 229.5 mL = 704.5 torr * V₂And solve for V₂:
V₂ = 248.4 mLWhat is a type of radiation produced when the unstable nucleus of a radioactive element emits a helium nucleus?
A. deuterium radiation
B. beta radiation
C. alpha radiation
D. gamma radiation
When an object is acted on by unbalanced forces, the object will -
Answer:
hope it helps and thank you for the points
The following diagram shows a single cell. Is the cell eukaryotic or prokaryotic? Explain your reasoning
Answer:
eukaryotic because it has a nucleus
Explanation:
: Calculate molar mass of the following compounds:
NaCl :
Ba(NO3)2:
K(MnO4):
Cl2:
CO2
Answer:
1. 58.5g/mol
2. 261g/mol
3. 158g/mol
4. 71g/mol
5. 44g/mol
Explanation:
The molar mass of a compound is the total mass of the sum of masses of all individual elements that make up the compound. First, we need to know the atomic masses of each element in a compound.
1. NaCl
Where; Na = 23, and Cl = 35.5
Molar mass of NaCl = 23 + 35.5
= 58.5g/mol
2. Ba(NO3)2:
Where; Ba = 137, N = 14, O = 16
Molar mass of Ba(NO3)2: 137 + {14 + 16(3)} 2
137 + (14 + 48)2
137 + (62)2
137 + 124
= 261g/mol
3. K(MnO4)
Where; K = 39, Mn = 55, O = 16
Molar mass of KMnO4 = 39 + 55 + 16(4)
= 94 + 64
= 158g/mol
4. Cl2
Where; Cl = 35.5
Molar mass of Cl2 = 35.5(2)
= 71g/mol
5. CO2
Where; C = 12, O = 16
Molar Mass of CO2 = 12 + 16(2)
= 12 + 32
= 44g/mol
Guys help me
Please
Answer:
8.38×10raise to power 23
Explanation:
mass of sugar=density ×volume
=. 1.59g/ml×25ml=39.75
no. of miles= given mass/ molar mass
= 39.75/342.3g / mole
1 mole of sugar =C12 H22 O11
contains
12× 6.023 × 10 ∆23=72.28× 10∆ 23 ×6.023×10²³
= 8.38× 10²³
Help!! < PHYSICAL SCIENCE>
WILL GIVE BRAINLIEST
Answer:
b
Explanation:
How many moon phases will we view in one week?
1
2
3
4
Answer:
4
Explanation:
Ayúdenme por favor
Please help me
Turbo or supercharger
Which equation is balanced?
A. H 2 + O 2 → H 2O
B. 2Na + Cl 2 → 2NaCl
C. KClO 3 → KCl 2 + 3O 2
D. CH 4 + 2O 2 → CO 2 + H 2 O
help pls this is physical science (9th grade )
Answer:
mamamkalalllaamakkaoakmaa
If Hydrochloric Acid and Calcium Carbonate were combined would the reaction that occurs be endothermic or exothermic? Why?
Answer:
endothermic
Explanation:
more energy is being released and heat is being required to do the process.
What is the pH of a solution with an OH- ion concentration of 4.01E-4?
Answer:
[H]=10^-4 when ph=4 higher
[H]=10^-5 when ph =5 lower
Explanation:
brains
The following diagram shows a single cell. Is the cell eukaryotic or prokaryotic? Explain your reasoning. *
Answer:
because it is a single cell. Cell A, because a nuclear membrane contains the cell’s DNA. Cell B, because it is much smaller. Cell B, because it contains genetic material
Explanation:
What is the molar mass of a sample of gas that has a density of 2.85g/L at 101kPa pressure
and 29°C? Name the law that is used to solve this problem.
Answer:71.25
Explanation:
The molar mass of a sample of gas that has a density of 2.85g/L at 101 kPa pressure and 29°C is 71.37 g mol⁻¹ and It can be solved using Ideal gas law.
What is Ideal gas law ?The ideal gas law is an equation of state that describes ideal gases.
This equation of state relates a gas’s pressure, volume, temperature, and mass, and is very useful for describing how gases will behave in ideal conditions.
This is the most common equation of state for gases.
Ideal Gas equation ;
PV = nRT
Molar mass (Mm) = m /n
Where ;
m = given massn = number of moleswe also know,
Density (D) = m / v
Where ;
m = massv = volumeNow, Putting the formula of Molar mass and Density in ideal gas equation we get ;
Molar mass = D RT/ P
Given ;
Density = 2.85 g/LPressure = 101kpa (= 0.99 atm)Temperature = 29°C (= 302.15 K)(Gas constant) R = 0.0821Putting all the values in the above equation of molar mass ;
Molar mass = 2.85 x 0.0821 x 302 / 0.99
= 71.37 g mol⁻¹
Learn more about Ideal gas law here ;
https://brainly.com/question/13821925
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PLS HELP ME!!!!!!!!!!!!!! I DON'T HAVE A LOT OF TIME !!!!!!!!
Answer: Well i think i have saw this i wolud say B hope this helps
Explanation:
If 190dm of hydrogen gas collected at 20°c and 760mmHg .Calculate it's volume at stp (standard pressure=760mmHg
Answer:
177.1 L
Explanation:
The excersise can be solved, by the Ideal Gases Law.
P . V = n . R . T
In first step we need to determine the moles of gas:
We convert T° from, C° to K → 20°C + 273 = 293K
We convert P from mmHg to atm → 760 mmHg = 1atm
1Dm³ = 1L → 190L
We replace: 190 L . 1 atm = n . 0.082 . 293K
(190L.atm) / 0.082 . 293K = 7.91 moles.
We replace equation at STP conditions (1 atm and 273K)
V = (n . R .T) / P
V = (7.91 mol . 0.082 . 273K) / 1atm = 177.1 L
We can also make a rule of three:
At STP conditions 1 mol of gas occupies 22.4L
Then, 7.91 moles will be contained at (7.91 . 22.4) /1 = 177.1L
Which option correctly orders the elements by increasing reactivity?
Hint: Review your periodic table.
Na < Li < K
Na < Li < K, ,
K < Na < Li
K < Na < Li, ,
Li < Na < K
Li < Na < K, ,
Na < K < Li
Answer: Li < Na < K is the answer
Explanation:
balanced the equation please Fe + O2 → Fe2O3
Answer: The balanced equation is 4,3,2,
Answer: Balanced equation = 4Fe + 3O2 => 2Fe2O3.
Explanation:
Difference between Duplet elements and octel elements?
Explanation:
octet is an atom or an ion having a maximum of eight electrons in the outermost shell while duplet is an atom having the maximum of two electrons in the outermost shell
What do all living organisms in an area make up?
Your friend sits on a 25.0L exercise ball, squishing the ball so that it is only 17.5L. What is the pressure inside the ball if the outside air pressure is 100. kPa?
Use the Boyle's Law equation to determine the answer.
Answer:
b
Explanation: because i took the test and got a 100
Volcanic eruptions can be very dangerous for nearby human and animal populations. One danger is that lava and ash may bury habitats. What is another danger during a volcanic eruption?
A.
Lava or hot debris may start fires.
B.
Lava flows may cause tsunamis.
C.
Volcanic eruptions always cause flooding.
D.
Volcanic eruptions always cause high winds.
Answer:
B. Lava flows may cause tsunamis.
what is molarity of 3 mole of hydrochloric acid in 3L of water
Answer:
1
Explanation:
Molarity is simply defined as the mole of solute per unit litre of water. Mathematically, it can be expressed as:
[tex]Molarity = \frac{mole}{volume}[/tex]
With the above information in mind, we can obtain the molarity of the hydrochloric acid solution as follow:
Mole of HCl = 3 moles
Volume of water = 3 L
Molarity =?[tex]Molarity = \frac{mole}{volume}\\Molarity = \frac{3}{3}\\Molarity = 1 M[/tex]
Therefore, the molarity of the hydrochloric acid solution is 1 M.
Learn more: https://brainly.com/question/15012982
Explain why a climax community is not always a forest.
What volume of 2.0 M sodium phosphate must be used to make 4.0 L of 0.80 M sodium phosphate?
Answer:
the amount of soduim phosphate is will be 52 percemt
Hydrogen and Oxygen combine to form water. In this chemical reaction, who represents the reactions(s)
A. water
B. oxygen and water
C.hydrogen and water
D. hydrogen and oxygen