Answer:
When we refer to microorganisms, if one is not there, the environment changes and another microbiota begins to predominate in the organism, which can be more or less pathogenic.
Explanation:
When the microorganisms that coexist and form the commensal biota, they live in an ideal equilibrium environment without generating pathology in humans, on the other hand, when this equilibrium is broken because some bacteria are absent, the pathology or infectious disease appears as it gives rise to to a rare biota such as pathogenic or transient.
Sodium Tetraborate, a naturally occurring mineral, is crushed into Borax. This is an example of a ________change. *
Chemical Change
Synthetic Change
Physical Change
Please Help I will mark brainllest for the first answer. If you dont know the answer do not answer please.
Answer:
Chemical Change
Explanation:
Which phrase most accurately describes a chemical change?
Question 7 options:
A change in taste
A change on the molecular level
A change in form
A change in appearance
Answer:
C. it's change in form....
Hope this helps...... Stay safe and have a Merry Christmas!!!!! :D
In the reaction, 210 kJ of heat energy is used to form 3.0 moles of hydrogen.
Calculate how much heat energy is needed to make 1000 kg of hydrogen.
Heat energy needed : 3.5 x 10⁷ kJ
Further explanationHeat is a form of energy that can flow from high-temperature objects to low-temperature objects.
So heat moves when there is a difference in temperature and can increase or decrease the temperature. An object that receives a lot of heat will cause a large increase in temperature
The amount of heat is influenced by the mass of the object and the difference in temperature
Can be formulated
Q = m.c.Δt
Q: heat received or removed by an object (J)
m: object mass (kg)
c: heat type substance (J / kg⁰C)
ΔT: temperature change (⁰C)
210 kJ of heat energy is used to form 3.0 moles of Hydrogen, so heat energy for 1 mol Hydrogen :
[tex]\tt \dfrac{210}{3}=70~kJ/mol[/tex]
mol of 1000 kg of Hydrogen=10⁶ g(MW=2 g/mol)
[tex]\tt \dfrac{10^6~g}{2}=5.10^5[/tex]
The heat energy :
[tex]\tt 70~kJ/mol\times 5.10^5~mol=3.5\times 10^7~kJ[/tex]
Please Help! No weird answers please!
For some traits, you will notice that there are fewer people with dominant traits than with the recessive trait. If you were a geneticist just discovering this phenomenon, what would your explanation be?
Answer:
The relationship of genotype to phenotype is rarely as simple as the dominant and recessive ... Why can you possess traits neither of your parents have? ... so concluded that there were some traits that dominated over other inherited traits. ... to notice a variety of relationships between alleles that code for the same trait.
Who is Gregor Mendeſ, and what did he
discover about traits?
Answer:
Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance. He deduced that genes come in pairs and are inherited as distinct units, one from each parent. Mendel tracked the segregation of parental genes and their appearance in the offspring as dominant or recessive traits.
Through his careful breeding of garden peas, Gregor Mendel discovered the basic principles of heredity and laid the mathematical foundation of the science of genetics.
Explanation:
The Himalayan mountain range found at the junction of India and Asia is an example of a
(1 point)
a.convergent boundary
b.divergent boundary
c.transform boundary
d.normal boundary
Answer: A : Convergent
Explanation:
this had me thinking
what is smaller than an atom... is there really anything smaller than an atom??!! i dont think there is is there?
Answer:
the protons, neutrons, and electrons that make up the atom?
Explanation:
which of the following best describe the main function of the cyrculatori system ?
a. to deliver nutrients an other essential material to cells an remove waste products
b. to break down the nutrients found in food so that they can be used by all cells in the humand body
c. to produce the chemical signals that allow parts of the humand body to communicated over long distances
d. to coordinate all others humand body system so that they can function together to maintain homeostaisis
Answer:
D
Explanation:
To coordinate all other human body system so that they can function together to maintain homeostasis
two answer multiple choice-- please help! 18 pts!
What is true about reaction spontaneity and entropy?
The rusting of iron is a nonspontaneous process because rust particles have less entropy than iron, and reactions with a decrease in entropy are nonspontaneous.
A spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
Answer: A spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.
Spontaneous reactions are those reactions which takes place on their own and do not require any external energy source. Spontaneous reactions are always accompanied by an increse in entropy.
Thus a spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
A student repeats a reaction several times to test the effects of various
changes on the reaction rate. The data table shows the results. Based on
these results, how would decreasing the concentration of the reactants
change the reaction rate?
Conditions
Original
Higher concentration
Higher temperature
Metal added
Reaction Time (5)
10 seconds
5 seconds
5 seconds
5 seconds
A. More information is needed to determine what would happen to
the reaction rate.
B. Decreasing the concentration would increase the reaction rate.
C. Decreasing the concentration would decrease the reaction rate.
D. Decreasing the concentration would have no effect on the
reaction rate.
Answer:
C) Decreasing the concentration would decrease the reaction rate.
Explanation:
A.P.E.X
This is how sodium appears in the periodic table.
An orange box has N a at the center and 11 above. Below it says sodium and below that 22.99. A blue arrow points to 22.99.
The arrow is pointing to sodium’s
number of neutrons.
chemical symbol
atomic mass
combined number of electrons and protons.
Answer:
C: atomic mass
Explanation:
Answer:Atomic mass
Explanation:
PLS HELP
Which shows the correct path of how energy flows in a food chain?
A) producer, consumer, predator, decomposer
B) symbiosis, producer, prey, decomposer
С) consumer, predator, carnivore, herbivore
D) niche, consumer, decomposer, chlorophyll
The correct path of how energy flows in a food chain is option A. producer, consumer, predator, decomposer.
Path of energy flows in a food chain?Here the producer gets the energy from the sun and photosynthesis after that it should be eaten by the consumer that is preyed from the predators and after that the last one is a decomposer.
hence, we can conclude that The correct path of how energy flows in a food chain is option A. producer, consumer, predator, decomposer.
Learn more about an energy here: https://brainly.com/question/17989910
5. In which group of elements do most atoms have completely filled s and p velence sublevels? A) halogens B) noble gases C) alkali mctals D) alkaline earth metals
Answer:
It's noble gas & they have filled p sublevels
the answer above isn't complete
Explanation:
pictures below
Based on its position in the table, with which other element do you think calcium might react?
A. Sulfur
B. Fluorine
C. Nitrogen
Answer: sulfer
Explanation:
what is dilution?..............
Answer:
di·lu·tion
the action of making a liquid more dilute.
"the milk factor is greatly reduced by dilution"
please help if you can
2H2(g) + O2(g) → 2H2O(l)
The chemical equation above describes a(n)__________.
A). endothermic change
B). reversible state change
C). chemical change
D). physical change
Answer:
i cants bye
Explanation:
byeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Look at periodic table. Which two elements share similar properties?
Answer: i think
lithium
potassium
At which type of boundary do lithospheric plates collide?
True or false: Some parasites are able to change the behavior of their host, which often helps the parasite complete some part of their life cycle
what is the chemical name for carbon?
HELP ME PLEASE ILL MARK BRAINLEST
Answer:
Tissues And Organ Systems I Have Answered This Question Before-
Explanation:
How many moles of Ar atoms are there in 202 L of Ar gas at STP? A) 1.20 x 1024 mol B) 1.11 x 10-1 mol C) 4.52 x 103 mol D) 9.02 mol E) 1.79 mol
a
1.20 x 1024 moles
b
9.02 mol
c
1.11 x 10-1 mol
d
4.52 x 103 mol
Answer:
4.52 x 10^3 mol
Explanation:
BABABOOEY
9.02 moles of Ar atoms are there in 202 L of Ar gas at STP. Therefore, option B is correct.
What do you mean by mole ?The term mole is refer to the amount of substance of a system which includes as many elementary entities.
One mole of any substance is exactly equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.
The mole concept can be used to convert between mass and number of particles.
Given:
At STP volume of Argon gas is 22.4 litre
Volume of Argon gas = 3.36 L
At STP ,
Temperature = 0°C
= 273.15 K
Pressure = 1 bar
= 0.986923 atm
R = gas constant
R = 0.08206 L atm K-1 mol-1
= 202 L × 1 mole / 22.4 L
= 9.01 mol
≅ 9.02 mol
Thus, option B is correct.
To learn more about the mole, follow the link;
https://brainly.com/question/26416088
#SPJ6
Help me answer this question for points!
Answer:
I am pretty sure Danny Duncan told me 69
Explanation:
niice
Which model failed to explain the
attraction between some
substances?
the model of Dalton
the model of Thomson
the Bohr-Rutherford model
all of the above
Answer:
C). The Bohr-Rutherford model
Explanation:
The 'Bohr-Rutherford model' of the atom failed to elaborate on the attraction between some substances. It essentially targeted hydrogen atoms and failed to explain its stability across multi-electrons. The nature and processes of the chemical reactions remained unillustrated and thus, this is the key drawback of this model. Thus, option C is the correct answer.
How many Oxygen Atoms & Lithium Atoms Are in 4Li2O?
Please Help!
Answer:
8 lithium atoms and 4 oxygen atoms
If the molecules of two different substances have a similar size but the molecules of one substance are polar while the molecules of the other substance are nonpolar, what is most likely true about the substances? A. The polar substance has a lower boiling point than the nonpolar substance. B. The nonpolar substance has a lower boiling point than the polar substance. C. Both substances have similar volatilities. D. Both substances have similar solubilities
Answer:
B. The nonpolar substance has a lower boiling point than the polar substance
Explanation:
i just took the test review on edge 2020 and i got it right :)!! so sorry this answer is a little late ::
Plzzzz help I need help with this
Answer: c extracting oil
Explanation:
Saudi Arabia is known for there huge oil market
Guys please help me.
Explain how an Ion of oxygen is different from an atom of oxygen and how are they similar
Explanation:
An atom is the smallest indivisible particle of any substance that takes part in a chemical reaction.
All atoms are identified by the number of protons in them. Protons are the positively charged particles in an atom.
Ions are atoms that have either lost or gained electrons. Therefore, they become charged. Atoms are neutral particles where the number of protons and electrons are the same.Therefore, atoms and ions are similar because the atom and ion of an element have the same number of protons but differs in the number of electrons they carry.
Helppppppp. much needed help lol
Answer:
Isotope
Explanation:
Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number.
How much heat will be released when 1.48 g of chlorine reacts with excess phosphorus according to the following equation?
2P + 5Cl2 → 2PCl5 ΔH = -886 kJ______kJ (Your answer should have 3 sig figs.)
Answer:
-3.70kJ
Explanation:
Notice that the problem provides you with the thermochemical equation for this reaction.
A thermochemical equation is simply a balanced chemical equation that includes the enthalpy change of reaction,
Δ
H
rxn
, for that particular reaction.
In your case, you have
2
P
(
s
)
+
5
Cl
2
(
g
)
→
2
PCl
5
(
g
)
Δ
H
rxn
=
−
886 kJ
This tells you that when the reaction produces two moles of phosphorus pentachloride,
PCl
5
, a total of
886 kJ
of heat are being given off
→
the reaction is exothermic.
Now, you need to figure out how much heat will be given off when
1.48 g
of chlorine gas reacts with excess phosphorus.
The fact that phosphorus is in excess tells you that chlorine will act as a limiting reagent, i.e. it will be completely consumed by the reaction.
Your goal now is to determine how many moles of chlorine gas you have in that sample. To do that, use its molar mass
1.48
g
⋅
1 mole Cl
2
70.906
g
=
0.02087 moles Cl
2
Use the
5
:
2
mole ratio that exists between chlorine gas and phosphorus pentachloride to determine how many moles of the latter will be produced when
0.02807
moles of chlorine take part in the reaction.
0.02807
moles Cl
2
⋅
2 moles PCl
5
5
moles Cl
2
=
0.008349 moles PCl
5
Now, you know that the reaction gives off
886 kJ
of heat when
2
moles of phosphorus pentachloride are formed. This means that when
0.008349
moles of the product are formed, the reaction will give off
0.008349
moles PCl
5
⋅
886 kJ
2
moles PCl
5
=
3.70 kJ
The answer is rounded to three sig figs.
Remember, these two statements
The reaction gives off
3.70 kJ
of heat when
0.008349
moles of product are formed
and
The enthalpy change of reaction,
Δ
H
rxn
, is equal to
−
3.70 kJ
when
0.008349
moles of product are formed
are equivalent!
Taking into account the definition of enthalpy of a chemical reaction, the quantity of heat released when 1.48 grams of chlorine reacts is 10.93 kJ.
Enthalpy of a chemical reactionThe enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.
The enthalpy is an extensive property, that is, it depends on the amount of matter present.
Heat released in this caseIn this case, the balanced reaction is:
2 P + 5 Cl₂ → 2 PCl₅
and the enthalpy reaction ∆H° has a value of -886 kJ/mol.
This equation indicates that when 2 moles of P reacts with 5 moles of Cl₂, 886 kJ of heat is released.
The molar mass is the amount of mass that a substance contains in one mole.
Being the molar mass of P 31 [tex]\frac{g}{mole}[/tex] and the molar mass of Cl₂ 24 [tex]\frac{g}{mole}[/tex], then when 62 grams (31 [tex]\frac{g}{mole}[/tex]× 2 moles) of P reacts with 120 grams (24 [tex]\frac{g}{mole}[/tex]× 5 moles) of Cl₂, 886 kJ of heat is released.
When 1.48 grams of chlorine are burned, then you can apply the following rule of three: if 120 grams of Cl₂ releases 886 kJ of heat, 1.48 grams of Cl₂ releases how much heat?
[tex]heat=\frac{1.48 grams x886 kJ}{120 grams}[/tex]
heat= 10.93 kJ
Finally, the quantity of heat released when 1.48 grams of chlorine reacts is 10.93 kJ.
Learn more about enthalpy of a chemical reaction:
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