What is the role of an Antibody?

Answers

Answer 1

Antibodies are part of the human immune system. Basically, they identify bad bacteria and viruses and track them down to fight back.


Related Questions

The energy that must be added to a system to break the bonds of the
reactants is known as _____?
potential energy
kinetic energy
thermal energy
activation energy

Answers

Answer:

activation energy

Explanation:

it is activation energy becauseThe activation energy for the forward reaction is the amount of

free energy that must be added to go from the energy level of the

reactants to the energy level of the transition state

How many grams of NH4NO3 are required to produce 4.29 g of N2O?

Answers

Answer:

To produce 1 mole of N2O required 1 mole of NH4NO3 . Hence, 60 grams of NH4NO3 are required to produce 33.0 g N2O

Explanation:

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what is the percent yield

Answers

the percent yield: 9/21 x 100% = 42.9%

What is the molarity of a solution that has 90 mol of solute dissolved in 6 liters of solvent? ___ M

Answers

Answer:

15M

Explanation:

To find molarity, you use the equation :

Molarity = [tex]\frac{moles of solute}{liters of a solution}[/tex]

So to find the molarity, you would do 90mols of the solute divided by 6 liters of the solvent which is 15M.

Which reactions are spontaneous? i. c2h5oh(l) 3o2(g) right arrow. 2co2(g) 3h2o(l), delta.g = –36.7 kj ii. 2c6h6(l) 15o2(g) right arrow. 12co2(g) 6h2o(l), delta.g = –6,405 kj iii. caco3(s) right arrow. cao(s) co2(g), delta.g = 13.0 kj iv. ni(s) cl2(g) right arrow. nicl2(s), delta.g = 1,130.28 kj i and ii iii and iv i and iii ii and iv

Answers

Reactions I and II are spontaneous reactions since they have negative delta G values.

What are spontaneous reactions?

Spontaneous reactions are reactions which proceed towards formation of products without addition of heat energy from the surroundings.

Spontaneous reactions have negative free energy change values (Delta G is negative) since the formation of products results in increase in entropy of the system.

Therefore, the spontaneous reactions are I and II because their delta G values are negative.

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Answer: A (I and II

Explanation:

The concentration of reactants and products and the rate of reaction were measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would explain a lower rate after another 3 seconds?

The concentration of reactants increased while the concentration of product decreased.
The concentration of reactants decreased while the concentration of product increased.
All concentrations of reactants and products decreased.
All concentrations of reactants and products increased.

Answers

Lower rate after another 3 seconds of the given rate is concentration of reactants increased while the concentration of product decreased.

What is the rate of reaction?

Rate of the reaction gives idea about the speed of the completion of the reaction or the formation of product.

Given rate of reaction = 1.8×10⁻⁶ m/sec

After 3 seconds rate of the reaction decreases, which means speed of the formation of product decreases as a result of which:

Concentration of product decreases.Concentration of reactant increases.

Hence, concentration of reactants increased while the concentration of product decreased.

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Answer:

B.  The concentration of reactants decreased while the concentration of product increased.

Explanation:

i took the test

Chemical labels must contain a product identifier, signal word and a pictogram to represent the hazards. what other information is required on a chemical label?

Answers

Answer:

The HCS now requires the following elements on labels of hazardous chemicals: Name, Address and Telephone Number of the chemical manufacturer, importer or other responsible party

Explanation:

I tried, I think this is the correct answer.

How many grams of iron are in 3.2 moles of iron

Answers

Answer:

17.03052

Explanation:

thats the answer i got hope this helps at all

3.2mol x 55.85g/mol = 178.72g

Use the molar mass of Fe (55.85g/mol) to identify the current mass.

uranium-235 fission given: energy released = about 200 MeV per individual reaction (mass = 235 amu) find the balanced nuclear reaction

Answers

The fission of uranium-235  leads to the equation; 235/92U + 1 neutron → 92/36Kr + 141/56Ba + 3 neutrons + energy.

What is a fission reaction?

The term fission reaction refers to the reaction in which a nucleus is bombarded with a particle  which causes the nucleus to break down. This leads to the release of energy.

The fission of uranium-235  leads to the equation; 235/92U + 1 neutron → 92/36Kr + 141/56Ba + 3 neutrons + energy.

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how many moles of O2 will react with 0.6482 moles of H2O?
2C3H6O + 5O2 → 6CO + 6H2O

Answers

Answer:

n=0.648 moles

the ratio 5:6

x:0.648

x=0.54 moles

what are three different ways land is used as a resource

Answers

1. Farming
2. Build transportation
3 Mining

A balloon containing 0.15mol of hydrogen gas (H2) has a volume of 0.75L. If the balloon is further inflated with additional hydrogen gas to a 3.75L volume, what is the total mass of hydrogen gas in grams in the balloon

Answers

The total mass of hydrogen gas in grams in the balloon given the data is 1.5 g

How to determine the new mole of hydrogenInitial mole (n₁) = 0.15 moleInitial volume (V₁) = 0.75 LNew volume (V₂) = 3.75 LNew mole (n₂) = ?

The new mole of the gas can be obtained by using the ideal gas equation as follow:

PV = nRT

V / n = RT / P

RT / P = constant

V₁ / n₁ = V₂ / n₂

0.75 / 0.15 = 3.75 / n₂

5 = 3.75 / n₂

Cross multiply

5 × n₂ = 3.75

Divide both sides by 5

n₂ = 3.75 / 5

n₂ = 0.75 mole

How to determine the mass of hydrogenNumber of mole = 0.75 moleMolar mass of H₂ = 2 g/moleMass of H₂ = ?

Mass = mole × molar mass

Mass of H₂ = 0.75 × 2

Mass of H₂ = 1.5 g

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A way of describing a chemical change that indicates what substances were present before the change and what substances are present after the change is called a _____.
A. chemical equation
B. chemical formula
C. chemical bond
D. All of the above
E. None of the above

Answers

Answer:

[tex]\\ \rm\dashrightarrow Chemical\: Equation [/tex]

Explanation:

When a chemical change happens or chemical reaction happens something yields at reactants and something at products

Representing them is called chemical equation

Solve and balance H2+Cl2

Answers

H2 + Cl2 → 2 HCl - Equation Balanced

Explanation:

Two elements H2and Cl2 combine to from a single compound, HCl. Hence, it is a combination reaction As two elements combine to from a compound, it is an element - element combination.

I hope it'll help you...

hey there!

[tex]H_2+Cl_2 -> 2HCl[/tex]

One hydrogen atom and one chlorine atom yields two moles of hydrochloric acid or also known as hydrogen chloride .

Uses of HCl are :-

•neutralization of alkaline agents
•as a bleaching agent, in food, textile, metal,
•and rubber industries

How many moles of oxygen are required to make 4 moles of water?​

Answers

Answer:

2 moles of oxygen

Explanation:

Basic Equation (given) :

2H₂ (g) + O₂ ⇒ 2H₂O (g)

From this, we understand for every 2 moles of water, 1 mole of oxygen is needed

Taking the number of moles of oxygen and water in proportion :

1 : 21 × 2 : 2 × 22 : 4

Therefore, 2 moles of oxygen are required to make 4 moles of water.

[tex] \textsf{\qquad\qquad\huge\underline{{\sf Answer}}} [/tex]

As per the given equation, we can infer that :

For getting 2 moles mole of water, 1 mole of oxygen gas was required. so to get 4 moles of water we need :

We just have to multiply the whole reaction by 2 on both sides, in order to get 4 moles of H2O on product side.

[tex] \qquad \qquad \rm4 \: H_2 + 2 \: O_2 \rightarrow4 \: H_2O[/tex]

therefore, we need

[tex]\qquad \sf  \dashrightarrow \: 2 \times 1 = 2 \: moles \: \: oxygen \: gas[/tex]

Which pair of molecules has hydrogen bonding interactions?.

Answers

Answer:

Hydrogen bonding is a special type of dipole-dipole interaction that occurs between the lone pair of a highly electronegative atom (typically N, O, or F) and the hydrogen atom in a N–H, O–H, or F–H bond.



a 125.0 mg sample of an unknown, monoprotic acid was dissolved in 100.0 ml of distilled water and titrated with a 0.050 m solution of naoh. the ph of the solution was monitored throughout the titration, and the data were collected. determine the ka of the acid and identify the unknown acid.

data-

volume of oh- added (ml), ph:

0, 3.09

5, 3.65

10, 4.10

15, 4.50

17, 4.55

18, 4.71

19, 4.94

20, 5.11

21, 5.37

22, 5.93

22.2, 6.24

22.6, 9.91

22.8, 10.2

23, 10.4

Answers

Answer:

33,666

Explanation:

is the dictionary definition of a word.

is the feeling or idea associated with a word.

what type of rock is the Wave made of?

Answers

What type of rock is the wave made of?

Answer: The Wave is a natural formation of ~sandstone rocks~

Why do medical implants and prosthetics should be carefully designed when placed inside or on the surface of the body?

Answers

Answer:

because it needs to fit exactly into how your body is like

Explanation:

The lewis dot structure rule states that
s=n-a.
recall that s represents the.total
number of valence electrons needed for
all the atoms in a molecule to achieve an
octet.
what is s for silicon tetrachloride, sic14?

Answers

Answer:

32

Explanation:

The total valence electron is available for the Silicon tetrachloride

lewis structure is 32

V. What volume of nitric oxide will diffuse out of a porous partition in 10 seconds when 25 ml of methane diffuse out in 4 seconds? ​

Answers

The volume of nitric oxide that will diffuse out of the partition in 10 seconds when methane diffuses is 62.5 mL

What is rate of diffusion?

This is defined as the amount diffused per unit time. Mathematically, it can be expressed as

Rate = volume / time

How to determine the rate of diffusion of methaneVolume of methane = 25 mLTime = 4 sRate = ?

Rate = volume / time

Rate = 25 / 4

Rate = 6.25 mL/s

How to determine volume of nitric oxideTime = 10 sRate = 6.25 mL/sVolume of nitric oxide = ?

Rate = volume / time

6.25 = volume of nitric oxide / 10

Cross multiply

Volume of nitric oxide = 6.25 × 10

Volume of nitric oxide = 62.5 mL

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At 0.500 atm and 15.0°C a sample of gas occupies 120. L. What volume does it occupy at
0.250 atm and 10.0°C?

O236 L
O 60 L
O 111 L
O 480 L

Answers

The combined gas law is used to determine the relationship between the pressure, temperature, and volume of the gas. The volume of the gas at 0.250 atm is 236 L. Thus, option A is correct.

What is combined gas law?

The combined gas law uses the ideal gas equation to estimate the temperature, volume, or pressure of the given gas.

Given,

Initial pressure = 0.500 atm

Initial temperature = 288.15 K

Initial volume = 120 L

Final pressure = 0.250 atm

Final temperature = 283.15 K

The final volume is calculated as:

V₂ =  (P₁V₁ T₂) ÷ (P₂ T₁)

= 0.500 × 120 × 283.15 ÷ 0.250 × 288.15

= 16989 ÷ 72.03

= 235.86 L

Therefore, 236 L is the final volume at 0.250 atm.

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Calculate the pressure (in kpa) of 1.5 mole of helium gas at 354 k when it occupies a volume of 16.5l.

Answers

Answer:

267.57 kPa

Explanation:

Ideal gas law:

PV = n RT        R = 8.314462    L-kPa/K-mol

P (16.5) = 1.5 (8.314462)(354)       P = 267.57 kPa

A nuclear fission reaction has mass difference between the products and the reactants of 0.0593 Calculate the amount of energy released by the reaction

a. 1.09 x 10(-45)J

b. 3.28 x 10(-37)J

c. 9.85 x 10(-29)J

d. 8.86 x 10(-12)J

Answers

The amount of energy released by the reaction b. 3.28 x 10(-37)J

What is a nuclear fission reaction?

A nuclear fission reaction in which the nucleus is divided into numerous small nuclei.

The mass difference is 0.0593

To calculate the energy

[tex]E = \Delta mc^2\\\\c = 3 \times 10^8\;m/s\\\\m = 3.86 \times 10^-^3 \;kg\\[/tex]

Putting the values in the equation

[tex]E = (0.0593) (3 \times 10^8\;m/s)^2 = 5.337 \times 10^1^5[/tex]

Thus, the correct option is b. 3.28 x 10(-37)J

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In an ionic bond, metals lose electrons to become _____.

Answers

Answer:

In an ionic bond, metals lose electrons to become Cations.

Explanation:

Metal atoms lose electrons to form positive ions (cations).

An unknown substance weighing 50.0g was heated from 36.0 to 69.0. In this process, the substance absorbed 5890.0J of energy. What is the specific heat of the substance

Answers

I am assuming that the temperature given is in Celsius. In order to solve for the heat capacity, use q = mc△T. Your q = -5890.0J, m = 50.0 g, and △T 33.0 °C (69.0 - 36.0). Use algebra to solve for your heat capacity (c). Remember, heat capacity is measured in joules per gram Celsius (J/g °C), and don’t forget your significant figures.

An aluminum aerosol can will burst if the pressure inside reaches 210.0 psi. if the can initially contains an ideal gas at 459.5 kpa at 298.15 k, at what temperature (in k) will the can burst?

Answers

The can will burst at 938.45 K.

What is Gay Lussac's Law ?

Gay Lussac's Law states that the pressure of a fixed amount of gas is directly proportional to the absolute temperature at constant volume.

i.e. P ∝ T

P= KT

P₁ = KT₁

P₂ = KT₂

Here we have considered that the gas is at two different temperatures and pressures which is denoted by T₁ , T₂ and P₁ , P₂

It can also be written as

(P₁ /P₂ )  = (T₁ / T₂)

It is given that

P₂ = 14.29 atm

P₁  = 4.535 atm

T₁ = 298.15 K

T₂ = ?

T₂ = (298.15 * 14.29 )/ 4.54

T₂ = 938.45 K

Therefore the can will burst at 938.45 K.

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Many factors would bring advantages when using fuel cells in cars, but which factor presents a drawback? fuel consumption hydrogen storage greenhouse gas emissions reliance on petroleum products

Answers

One potential drawback of using fuels cells in cars is that it require large tanks for hydrogen storage.

What are fuels cells?

Fuel cells are cells which use hydrogen and oxygen as fuel to produce electrical energy for use in various purposes such as in powering cars.

The energy produced is as a result of redox reactions.

Fuels cells are clean renewable energy sources.

A potential drawback of using fuels cells in cars is that it require large tanks for hydrogen storage.

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A copper foil is made from copper, absolutely free of impurities. Which term or terms could be used to describe this sample of copper

Answers

Answer:

Explanation:

pure chemical substances and element.

All elements are pure. If this sample of copper had been impure, we would call it a mixture, not an element.

what is the law of Conservation of mass ?​

Answers

The Law of Conservation of Mass states that energy can neither be created nor destroyed in a chemical reaction.
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