Which best describes the role of a negative feedback loop?
0 The output is reduced so the body can maintain homeostasis.
0 The output builds so the body can maintain homeostasis.
0 Hormone levels in the blood increase to increase effects.
0 Hormone levels in the blood decrease to increase effects.
Pls Hurry!!!! ANYONE PLS HELP ME!! I AM DOING THE UNIT TEST AND I NEED THIS FAST!!! APAP PPL!! PLS!! WILL MARK BRAINLIEST!!!
Answer:
A
Explanation:
now I'm not sure, but considering negative feedback allows the systems to self stabilize that would be the best option.
PLEASE NOTE THAT THIS IS A EDUCATED GUESS.
Imagine a basketball filled with liquid water.Would the basketball still hold the same number of molecules? Can you use
22.4 L/mol as the molar volume for liquid water
Answer:
Yes !
Explanation:
The ball will have more molecules.
a basketball filled with liquid water. yes we use 22.4 L/mol as the molar volume for liquid water.
what are the properties of water ?Water is the chemical substance having chemical formula H2O, one molecule of water consist of two hydrogen atoms which are covalently bonded to a single oxygen atom.
The physical property of Water are, it is a colorless and tasteless liquid, have extensive hydrogen bonds resulting in unusual properties in the condensed form.
This also have high melting and boiling points. As compared to other liquids, water has a higher specific heat, thermal conductivity, surface tension, dipole moment, etc.
Water is a great solvent and helps in the transportation of ions and molecules required for metabolism, has high latent heat of vaporization helps in the regulation of body temperature.
It is Amphoteric nature can act as both acid and base means that it is amphoteric in nature, it is Electropositive elements which reduce water to hydrogen molecule and it is the source of hydrogen.
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what is the periodic trend for electronegativity
Answer:
mark me brainlest
Explanation:
Electronegativity values generally increase from left to right across the periodic table. Electronegativities generally decrease from top to bottom of a group. The highest electronegativity value is for fluorine.
Answer:
"Electronegativity increases as you move from left to right across a period because the number of charges on the nucleus increases." (sstudy30 on Quizlet)
Explanation:
It explains itself haha!
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather
How do mixtures differ from substances?
Answer:
In chemistry: a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.
Hope this helps :)
Using the information in the table, calculate the number of moles in a 7.89 kg sample of aspirin
(C9H8O4).
Write your answer using three significant figures.
Answer:
43.7mol
Explanation:
[tex]?mol = 7.86kg * \frac{1000g}{1kg} *\frac{1mol}{180g}[/tex]
Above is dimensional analysis method. Write what you are trying to find with the question mark and write your given info on the other side of the equal sign. Follow the units and pay attention to them cancelling out. You should have your answer unit by the end.
the 180g came from the table with masses times the chemical formula all added together. Below is exact formula.
hydrogen mass(hydrogen amount) + carbon mass(carbon amount) + oxygen mass(oxygen amount)
1g(8)+12g(9)+16g(4)=180g
180g is 1 mole of [tex]C_{9} H_{8} O_{4}[/tex]
what is temperature?
Answer:
a measure of hotness or coldness expressed in terms of a scale like Fahrenheit or Celcius
In the reaction below the total mass of calcium in the reactants is 40. What is the total mass of calcium in the products?
Answer:
40
Explanation:
The total mass of calcium in the products is 40
What is the total mass number?The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the table below, which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.
How do you find the mass number?Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.
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for each compound in the table below, decide whether there would be any hydrogen-bonding force between molecules of the compound, or between molecules of the compound and molecules of water.
Hydrogen bonding occurs between water and molecules that are polar in nature.
Even though the question is incomplete, I will try to help you to the best of my ability. Hydrogen bonding is formed when hydrogen is bonded to a highly electronegative atom.
Hydrogen bonding could occur between the molecules of a compound or between the molecules of a substance and water. Hydrogen bonding occurs between the molecules of a substances such as NH3, H2O and HF.
On the other hand, hydrogen bonding occurs between water and the compound in compounds such as CH2F2, amines, etc.
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Whether a hydrogen-based energy system is environmentally cleaner than a fossil fuel system depends on ________. the car driven governmental incentives for research the amount of fossil fuels that are invested in long-term storage the source of oxygen used for the process the source of energy used to produce the hydrogen
A hydrogen energy system is made up of hydrogen production, transportation, storage, utilization etc. Whether a hydrogen-based energy system is environmentally cleaner than a fossil fuel system depends on the source of energy used to produce the hydrogen.
Hydrogen fuel cells often makes electricity by using hydrogen and oxygen atoms. The hydrogen is said to reacts with oxygen across an electrochemical cell.Hydrogen is known to carry some amount of energy carrier and can also deliver or store a large amount of energy. Hydrogen is often used in fuel cells to generate electricity, or power and heat.
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How to find the partial pressure of a gas.
Answer:
The total pressure of a mixture of gases can be defined as the sum of the pressures of each individual gas: Ptotal=P1+P2+… +Pn. + P n . The partial pressure of an individual gas is equal to the total pressure multiplied by the mole fraction of that gas.
Using diving terms, partial pressure is calculated as: partial pressure = (total absolute pressure) × (volume fraction of gas component) For the component gas "i": pi = P × F.
why are baseballs harder to pick up tennis balls?
Explanation:
Because baseballs are made out of things that make it heavier then tennis balls, easier to play the sport. that's why they use a bat in baseball.
275 KJ of energy was transferred to water at 15c. Calculate the mass of water that can be brought to its boiling point
Answer:
need points rn sorry bro hope u get ur answer
Explanation:
Help help with the question below
How many cl- ions are there in 2. 50 kg of barium chooride.
Which list includes only bulk properties of matter?
-boiling point, kinetic energy, surface tension
-kinetic energy, the strength of electrical forces, vapour pressure
-boiling point, the strength of electrical forces, vapour pressure
-boiling point, surface tension, vapour pressure
Boiling point, surface tension and vapour pressure is the list that includes only bulk properties of matter.
Bulk matter refers to those materials that contains large numbers of atoms, molecules, or ions. Its can be present into all states of matter that may be solid, liquid or gas.
Boiling is a bulk process and occurs throughout the liquid as well as surface tension and vapour pressure is also bulk properties of matter so we can conclude that boiling point, surface tension and vapour pressure is the list that includes only bulk properties of matter.
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4. If the speed of an object increases, its kinetic energy
stays the same
decreases
increases
Answer:
I think the answer is increases
An atom of sodium has 11 electrons. Make a sketch of a sodium atom, showing how many electrons it has at each energy level. Infer how reactive sodium atoms are.
SOMEONE PLEASE HELP ME OUT. :( I DONT GET IT !!!
Answer:
Sodium has 11 electrons. The first two fill the innermost energy level. The second energy level is also full, holding eight electrons and one electron remaining in the outer energy level. It is the number of outer electrons that give an element its chemical properties.
Explanation:
Sodium has 11 electrons. Therefore electronic configuration of sodium is (2,8,1).
What are electrons?
Electrons are the negatively charged particles of an atom. An atom contains a positive proton, a negative electron, and a neutral neutron. Electrons are negatively charged particles that rotate around the atom.
There are around 118 elements in the earth. Sodium is a important element. The atomic number of sodium is 11. The first shell contains 2 electrons, 2nd shell contains 8 electrons and 3rd shell will have 1 electron in sodium.
Sodium is a metal. It will loose that one electron and become cation. It become Na+.
Therefore, Sodium has 11 electrons. Therefore electronic configuration of sodium is (2,8,1).
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Energy moves back and forth through the differnent ________.
help asap for brainlist
Which statement BEST describes how many Aluminum atoms are needed when making Aluminum chloride?
Question 11 options:
1 Aluminum atom is needed because Aluminum donates one valence electron to Chlorine.
3 Aluminum atom is needed because Aluminum donates three valence electron to Chlorine.
3 Aluminum atom is needed because Aluminum accepts three valence electron from Chlorine.
2 Aluminum atom is needed because Aluminum accepts three valence electron from Chlorine.
Answer:
34 Aluminum Atoms needed to make Aluminum Chloride
Explanation:
Because through this bottom 34 atoms are subheading to make Aluminum Chloride through magnesiumWhat is an empirical formula
Answer:
a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
Explanation:
Answer:
Meaning of Empirical formula :- A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.Defination of Empirical formula :- The empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S₂O₂.Explanation:
Hope this helps you XD ✌️Carry on learning !!most transition metal ions contain partially occupied ________ subshells.
An atom has 5 protons, 4 electrons, and 5 neutrons. Which
of the following reasons represents why this is an atom of
the element boron?
A ) The atom has 5 neutrons, just like every atom of boron
B ) The atom has 4 electrons, just like every atom of boron
C ) The atom has 14 total particles, in a combination of 5-5-4 just like every atom of boron
D ) The atom has 5 protons, just like every atom of boron
< PLEASE HELP ASAP!
Answer:
i think the answer is C
Explanation:
not sure plsss dont bash im a beginner
Answer:
B ) The atom has 4 electrons, just like every atom of boron
Explanation:
HOPE IT'S HELPBreak down the following equations into two half equations(One for oxidation, one or reduction )
1. Cu + 2Ag+ ➡️Cu2+ +2Ag
2. Cl2 +2I ➡️2cl-+I2
Answer:
see explanation
Explanation:
Break down the following equations into two half equations(One for oxidation, one or reduction )
1. Cu + 2Ag+ ➡️Cu2+ +2Ag
2. Cl2 +2I- ➡️I2 + 2Cl-
in reaction "1", the copper is being oxidized from 0 to +2 by losing 2 electrons
Cu---->Cu2+ + 2e-in reaction "2
in reaction "1" the silver is being reduced by gaining those 2 e-.
2Ag1+ + 2e----------->2Ag
In reaction "2", the iodine is being oxidized by losing 2 e-
2I- -------------> I2 + 2e
In reaction "2" the chlorine is being reduced by gaining those 2 e
Cl2 + 2e------------> 2Cl-
To solve such this we must know the concept of redox reaction. Therefore, the half reaction for the given reactions can be written as
1. Cu + 2Ag⁺ [tex]\rightarrow[/tex]Cu²⁺ +2A
Cu [tex]\rightarrow[/tex]Cu²⁺ + 2e⁻
2Ag⁺ + 2e⁻[tex]\rightarrow[/tex]2Ag
2.Cl[tex]_2[/tex]+2I⁻ [tex]\rightarrow[/tex]I[tex]_2[/tex] + 2Cl⁻
2I⁻[tex]\rightarrow[/tex] I[tex]_2[/tex] + 2e⁻
Cl[tex]_2[/tex] + 2e⁻-----------> 2Cl⁻
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Redox reaction is a chemical reaction where oxidation and reduction takes place simultaneously. Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant.
1. Cu + 2Ag⁺ [tex]\rightarrow[/tex]Cu²⁺ +2A
Cu [tex]\rightarrow[/tex]Cu²⁺ + 2e⁻
2Ag⁺ + 2e⁻[tex]\rightarrow[/tex]2Ag
2.Cl[tex]_2[/tex]+2I⁻ [tex]\rightarrow[/tex]I[tex]_2[/tex] + 2Cl⁻
2I⁻[tex]\rightarrow[/tex] I[tex]_2[/tex] + 2e⁻
Cl[tex]_2[/tex] + 2e⁻-----------> 2Cl⁻
Therefore, the half reaction for the given reactions can be written as above.
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how can teh human body looose heat? (conduction, convecion, radiation) and WHY
Answer:
Radiation and conduction
Explanation:
The human body lose heat by these two ways, because everything that touches our bodies and is in a temperature below us will receive part of our heat (conduction), and you can figure out that we lose heat by radiation because a human bright in a heat cam
what is the maximum concentration of salt in water for an ecosystem to be classified as a freshwater system?
Answer:
The saline water should be from 1000 ppm to 3000 ppm while fresh water is less than 1000 ppm
If anhydrous mgso4 is the desired product, what is the atom economy of this reaction?.
This problem is referring to an anhydrous salt that is derive from a hydrated Epson salt (magnesium sulfate hydrate) and the atom economy is required. However, not enough information is provided, yet we can use the attached file as a reference to provide a methodology of calculation.
To begin with, we need to calculate the [tex]x[/tex] which refers to the degree of hydration of the salt, so that we use the mass before and after heating the sample to figure out the grams and subsequently moles of water that are in there:
[tex]m_w=3.648g-1.782g=1.866g\\\\n_w=0.103molH_2O[/tex]
Next, since 1.782g corresponds to the anhydrous salt, we calculate the moles in such a amount:
[tex]1.782gMgSO_4*\frac{1molMgSO_4}{120.4gMgSO_4}=0.0148mol[/tex]
Then, we divide the moles of water by those of the anhydrous salt to calculte [tex]x[/tex]:
[tex]x=\frac{0.103mol}{0.0148mol} =6.96=7[/tex]
This means the formula of the hydrate is:
[tex]MgSO_4\ 7H_2O[/tex]
Finally, for the atom economy we just divide the molar mass of the anhydrous salt by that of the hydrate:
[tex]A.E=\frac{120.4g/mol}{246.47g/mol} *100\%\\\\A.E=48.8\%[/tex]
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https://brainly.com/question/20796771What is the theoretical yield of sodium chloride when 8.3 g of sodium is reacted with 4.5 g of chlorine? 2Na(s) + Cl2(g) → 2NaCl(s)
The theoretical yield of sodium chloride when 8.3 g of sodium react with 4.5 g of chlorine is 3.30 g
We'll begin calculating the masses of Na and Cl that reacted and the mass of NaCl produced from the balanced equation.
2Na + Cl₂ —> 2NaClMolar mass of Na = 23 g/mol
Mass of Na from the balanced equation = 2 × 23 = 46 g
Molar mass of Cl₂ = 2 × 35.5 = 71 g/mol
Mass of Cl₂ from the balanced equation = 1 × 71 = 71 g
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mass of NaCl from the balanced equation = 2 × 58.5 = 117 g
SUMMARY
From the balanced equation above,
46 g of Na reacted with 71 g of Cl₂ to produce 117 g of NaCl
Next, we shall determine the limiting reactant.From the balanced equation above,
46 g of Na reacted with 71 g of Cl₂
Therefore,
8.3 g of Na will react with = (8.3 × 71)/46 = 12.81 g of Cl₂
From the calculation made above, we can see that a higher amount (i.e 12.81 g) of Cl₂ than what was given (i.e 4.5 g) is needed to react completely with 8.3 g of Na.
Therefore, Cl₂ is the limiting reactant and Na is the excess reactant
Finally, we shall determine the theoretical yield of NaCl by using the limiting reactant (i.e Cl₂)From the balanced equation above,
71 g of Cl₂ reacted to produce 117 g of NaCl.
Therefore,
4.5 g of Cl₂ will react to produce = (4.5 × 117)/71 = 3.30 g of NaCl
Thus, the theoretical yield of NaCl produced is 3.30 g
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Answer:
The correct answer is 7.4 g NaCl
Explanation:
What is the molar concentration of a solution prepared by dissolving 3.05 grams of sodium acetate in enough water to prepare 3.43 x 102 mL of the solution
Answer:
0.296 M
Explanation:
What is the molar concentration of a solution prepared by dissolving 3.05 grams of sodium acetate in enough water to prepare 3.43 x 102 mL of the solution
sodium acetate NaCH3COO has molar mas of
23 + 12 +24 + 1 +32 = 92 g/mol
3.05 g is 3.05 g/ 92 g/mol = 0.0328 moles
it is distributed over 102 mL = 0.102 L
its concentration is 0.0328/ 0.102 =0.296 M Mhttps://brainly.com/question/25586315?answering=true&answeringSource=feedPublic%2FhomePage%2F3#
Analysis of a 1.7500-g sample of
Pepto-Bismol yields 346 mg of bismuth. What percent by
mass is bismuth subsalicylate in the sample? (Assume that
there are no other bismuth-containing compounds in
Pepto-Bismol.)
Answer:
19.8 %
Explanation:
Analysis of a 1.7500-g sample of
Pepto-Bismol yields 346 mg of bismuth. What percent by
mass is bismuth subsalicylate in the sample? (Assume that
there are no other bismuth-containing compounds in
Pepto-Bismol.)
346 mg = 0.346 gm
0.346 gm/1.75 gm =0.198 = 19.8 %
Describe how calcium and fluorine bond together to form calcium fluoride
Answer: A transfer of electrons occurs when fluorine and calcium react to form an ionic compound. This is because calcium is in group two and so forms ions with a two positive charge. ... A pairs of shared electrons makes one covalent bond. The compound formed is known as a molecule***