Choose all of the items needed to complete a
circuit

resistor

wire

battery

pencil

plug

​

Answer:

Chemical reactions that absorb (or use) energy overall are called endothermic. In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products.

Explanation:

I hope it's useful for u...

Thank you

Answer:

Atomic number

Explanation:

Because atomic number is unique for each element and never changes

The expected absorbance of a standard solution made by dissolving 0.0070 mol of NiCl2 · 6H2O in water to make 100 ml of solution is 0.227.

Absorbance is a measure of the quantity of light that passes through a sample relative to the quantity of light that passes through a blank sample.

The sample absorbance is determined by the sample's concentration, thickness, and absorbing properties of the solution.

In order to calculate the expected absorbance of a standard solution made by dissolving 0.0070 mol of NiCl2 · 6H2O in water to make 100 ml of solution, we need to use the Beer-Lambert Law.

It states that the absorbance of a solution is directly proportional to the concentration of the solution and the length of the path that the light has to travel through the solution.

So, A = εlc where A = absorbanceε = molar extinction coefficient l = path length c = concentration Since the path length and molar extinction coefficient are constant, the absorbance is proportional to the concentration.

So, A1/A2 = C1/C2

Where, A1 = absorbance of the standard solutionC1 = concentration of the standard solution

A2 = absorbance of the unknown solutionC2 = concentration of the unknown solution Rearranging the formula we get, C2 = C1(A2/A1)

Given that the concentration of the standard solution is 0.0070 mol/L and the path length is 1 cm.

The molar extinction coefficient for NiCl2·6H2O is 4.76 × 10^3 L/mol·cm. Substituting these values in the formula we get, C2 = 0.0070 mol/L × (0.380/1.660) = 0.0016 mol/L

Again, using the Beer-Lambert law we can find the expected absorbance of the unknown solution, where A = εlc.A = 4.76 × 10^3 L/mol·cm × 1 cm × 0.0016 mol/L = 7.62.

The expected absorbance of a standard solution made by dissolving 0.0070 mol of NiCl2 · 6H2O in water to make 100 ml of solution is 0.227.

To know more about Standard solution refer here:

https://brainly.com/question/18720754#

#SPJ11

The number-average molecular weight for L = 2500 nm is 10000 and the number-average molecular weight for r = 20 nm is approximately 7.2 × 10⁶.

To calculate the number-average molecular weight (Mn) for a linear polyethylene by using the given definitions, the following relationships will be used:

(a) Mn = L / l₀

(b) Mn = 3πN₀²r² / 10

where the given values represent :

L= total chain molecule length,

l₀ = Kuhn segment length (assumed to be the average length between chain entanglements),

r = average chain end-to-end distance,

N₀ = Avogadro's number (6.022 × 10²³).

The Kuhn segment length (l₀) is approximately 2.5 Å (0.25 nm)  for a linear polyethylene.

(a) Given value of total chain molecule length( L) = 2500 nm:

Mn = L / l₀

= \(\frac{2500}{0.25} nm\)

= 10000

Therefore, the value of number-average molecular weight for L = 2500 nm is 10000.

(b) Given value of  r = 20 nm:

Mn = 3πN₀²r² / 10

=\(\frac{(3\pi(6.022 X 10^{23})^{2} }{10}\)

≈ 7.2 × 10⁶

Therefore the value number-average molecular weight for r = 20 nm is approximately 7.2 × 10⁶.

Learn more about molecular weight here:
brainly.com/question/20380323

#SPJ4

The following reaction occurs when butane is completely burned, producing the following byproducts: 8 CO2, 10 H2O, and 2 C4H10 + 13O2.

Correct option is, B.

The yellow flame indicates incomplete combustion of butane. If only a portion of the carbon atoms of butane are converted to carbon dioxide during combustion, this is known as incomplete combustion. It produces carbon dioxide or carbon particles to some extent or completely (soot).

Complete combustion produces carbon dioxide (CO2) or water when carbon and hydrogen are combined with oxygen (O2) (H2O). Incomplete combustion produces soot and carbon monoxide when some of the carbon is not fully oxidised (CO).

To know more about reaction visit:

https://brainly.com/question/28984750

#SPJ1

Answer:

when the reaction is complete 17 g product must be obtain.

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given reaction,

2K  + I₂     →    2KI

4 g + 13.0 g  =  17 g

 17 g        =   17 g

So when the reaction is complete 17 g product must be obtain because the amount of reactants were 17 g and according to law of conservation of mass ,mass can neither be created nor destroyed in a chemical equation but only convert from one to another form.

Another example:

In  photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction also followed the law of conservation of mass.

By taking into account the different seating possibilities for the biologists, chemists, and physicists, you will find that the total number of valid seating arrangements is indeed 32.

Your approach is incorrect because it does not consider all possible arrangements that satisfy the given conditions. Let's analyze your approach step by step.

You correctly start by seating one biologist, which can be done in 1 way. However, when you proceed to seat the second biologist, you assume that there are 3 choices. This is where the error occurs.

Consider the following possibilities:

If the first biologist is seated at Chair 1, the second biologist cannot be seated at Chair 2 or Chair 6, as they would be sitting next to each other. Therefore, the second biologist can only be seated at Chair 4.

If the first biologist is seated at Chair 2, the second biologist can only be seated at Chair 5.

If the first biologist is seated at Chair 3, the second biologist can only be seated at Chair 6 or Chair 1.

If the first biologist is seated at Chair 4, the second biologist can only be seated at Chair 1.

If the first biologist is seated at Chair 5, the second biologist can only be seated at Chair 2.

If the first biologist is seated at Chair 6, the second biologist can only be seated at Chair 3.

So, there are actually 6 different arrangements for seating the two biologists.

Now, if we continue with your approach, seating the chemists and physicists, we need to consider the additional possibilities that arise due to the constraints of the biologist's seating arrangements.

Therefore, the correct approach would involve considering all possible arrangements that satisfy the given conditions. By taking into account the different seating possibilities for the biologists, chemists, and physicists, you will find that the total number of valid seating arrangements is indeed 32.

Learn more about possibilities from below link

https://brainly.com/question/13604758

#SPJ11

Answer:

El agua oxigenada se encuentra en cuatro concentraciones diferentes expresadas “en tanto por ciento”: 8%, 30%, 35% y 50%. Sin embargo, hay quien prefiere hablar de “volúmenes” y no de “porcentajes”.

According to the stoichiometry of the generic chemical reaction A + 2B → C, if 2 moles of B react completely, it will produce 1 mole of C.

In the given generic chemical reaction, the stoichiometric coefficient of B is 2, indicating that 2 moles of B are required to react with 1 mole of A to produce 1 mole of C. Therefore, if we start with 2 moles of B, all of it will react completely, resulting in the formation of 1 mole of C.

The stoichiometry of a balanced chemical equation provides the ratio of moles between reactants and products. In this case, for every 2 moles of B, 1 mole of C is formed. Hence, when 2 moles of B react, they will completely consume and yield 1 mole of C as the final product.


To learn more about stoichiometry click here: brainly.com/question/28780091

#SPJ11

Answer:

Magnesium chloride

Answer:

Pros: No vehicle emissions other than water vapor. Fuel economy equivalent to about twice that of gasoline vehicles. Hydrogen is abundant, and can be made from renewable energy. Cons: This space-age technology is expensive.

Answer:

The pros of hydrogen fuel cells are that they are very efficient, producing very little waste. They are also very stable, which makes them safe to use.

The cons of hydrogen fuel cells are that they can be expensive to produce and maintain, and they require a lot of energy to power them, meaning that they often aren't as efficient as they could be.

Despite these pros and cons, hydrogen fuel cells are still a very promising technology. With more research, attention, and development, they could be a powerful force in the fight against carbon emissions and global warming.

Answer:

the first geological time period of the Paleozoic Era

Explanation:

Answer:

NO

The mass number of an atom is the total number of protons and neutrons it contains. The mass number of an atom is never smaller than the atomic number.

EXPLANATION:-

The atomic number is always a lesser value than the mass number. The mass number is always a greater value than the atomic number. Atoms are made of electrons, protons, and neutrons. Protons and neutrons together form the nucleus of an atom

Atomic number = number of proton/number of electron

mass number = number of proton + number of Neutron

PLS RATE A BRAINLIEST

Answer: 112.2 g

Explanation:

The atomic mass of silicon is 32.065 g/mol, so 3.5 moles have a mass of (3.5)(32.065) grams, or about 112.2 g

Answer:

lose protons and form ions

Explanation:

I thjink hope this helps

PLease mark brainliest

The frequency of the wave is found to be 7.05×10¹⁴hertz.

The relation between speed of light, frequency and wavelength is given by,

C= fλ

f=c/λ

f= 3×10⁸/425×10⁻⁹

f=7.05×10¹⁴.

Thus, the frequency of the wave is found to be 7.05×10¹⁴ hertz.

The number of waves that pass a specific place in a given period of time is known as the wave frequency. The hertz (Hz) is the SI unit for wave frequency, and 1 hertz is equivalent to 1 wave crossing a fixed point in 1 second. A wave with a higher frequency has more energy than a wave with a lower frequency of the same amplitude.

A wave’s wavelength is the separation between two adjacent waves’ corresponding points. The Greek letter lambda () is typically used to represent a wave’s length. Wavelength is defined as the product of a wave train’s frequency (f) and speed (v) in a medium.

To learn more about wavelength, refer this link.

https://brainly.com/question/10750459

#SPJ9

Answer:

C

Explanation:

It's simple because there were so many quantitative analysis of error and they didn't had the kind of observations as we have now

Answer:

4.Current and static electricity

Explanation:

Answer:

cinder cone: made of pieces of lava

shield volcano: wide summit, gentle slope

volcanic soil: rich in nutrients

caldera: bowl shaped depression

lava plateau: material fills in valleys

Explanation:

it’s right

Answer:

Caldera, Bowl-Shaped depression

Shield volcano, Wide summit, Gentle slope

Lava plateau, Material fills in valleys

Volcanic soil, Rich nutrients

Cinder Cone, Made of pieces of lava

Explanation:

Got it right on edge

Answer:

A perfect mold of a dinosaur bone

Answer:

Experiments are most useful when investigating predictions derived from explicit theories, and it is theories, rather than experimental results, that are properly used to explain features of natural settings.

Answer:

to explore new possibilities

hope it helps

Answer:about 10,000 years b maybe

Explanation:Strontium-90 and cesium-137 have half-lives of about 30 years (half the radioactivity will decay in 30 years). Plutonium-239 has a half-life of 24,000 years. High-level wastes are hazardous because they produce fatal radiation doses during short periods of direct exposure.

The radioactive waste from nuclear plants is radioactive for 10,000 years and the correct option is option B.

The waste produced by a nuclear power plant or lab is referred to as radioactive waste. They include radioactive substances that are dangerous to the environment and the majority of biological forms. The wastes degrade over time.

Radioactive wastes are stored to-

Therefore, the radioactive waste from nuclear plants is radioactive for 10,000 years and the correct option is option B.

Learn more about Radioactive waste, here:

https://brainly.com/question/29783451

#SPJ2

Answer:

d

Explanation:

Aluminium and Indian are in the same group/family

Sodium and Sulfer are in the same period

Elements of the same family have similar properties

Since sulfur and sodium aren't in the same family they dont share properties

According to Newton, whenever objects A and B interact with each other, they exert forces upon each other. ... These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction.

There are total three laws of newtons, first law of newtons, second law of newton and third law of newton. Therefore, action and reaction forces are described by newtons  third law of motion.

Newton's first law is also called law of inertia. An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Third law states that for every action there is an equal and opposite reaction. Third law is applicable in many field of physics. The third law is applicable in the running of rockets. The third law is also used by swimmers during swimming in pool.

Therefore, action and reaction forces are described by newtons  third law of motion.

To learn more about newton's law, here:

https://brainly.com/question/29768600

#SPJ6

Answer:

d. melting

As heat enters the water the particles move much faster, bumping into each other. Therefore, more heat means more energy!

Hopesthis helps!

The concentration of a solution (in m) prepared by diluting 37.00 ml of 0.250 m potassium chloride to 150.00 ml is  1.01 M .

Calculation ,

Formula used : \(M_{1} V_{1} = M_{2} V_{2}\)

Where M is the morality or concentration of  potassium chloride and V is the volume in ml .

Initial concentration ( \(M_{1}\)  ) = ?

Final concentration (  \(M_{2}\) ) = 0.250

Initial volume ( \(V_{1}\) ) = 37.00 ml

Final volume ( \(V_{2}\) )  =  150.00 ml

Putting the value of Initial concentration , Initial volume and final volume in equation ( i ) we get .

\(M_{1}\)   × 37.00 ml =  0.250 × 150 ml

\(M_{1}\)   = 0.250 × 150 ml / 37.00 ml = 1.01 M

to learn more about concentration please click here ,

brainly.com/question/10725862

#SPJ4

To determine Eo for the given reaction, we can use the equation:  Eo(cell) = Eo(cathode) - Eo(anode)

The reduction potential for the cathode is the reduction potential of Ti²⁺, which is -1.63 V.

The reduction potential for the anode is the reduction potential of Fe³⁺, which is 0.77 V.

Plugging the values into the equation, we have:

Eo(cell) = (-1.63 V) - (0.77 V)

Eo(cell) = -2.40 V

Therefore, the standard cell potential (Eo) for the given reaction is -2.40 V.

This negative value indicates that the reaction is not spontaneous under standard conditions. The electrons flow from the anode (Fe³⁺) to the cathode (Ti²⁺), resulting in a negative cell potential. The reaction would require an external energy source to proceed.

To know more about "Standard reduction" refer here:

brainly.com/question/8739272#

#SPJ11

Answer:

0.0188

Explanation:

using pv=nRt

where v--volume

p pressure

n number of moles

t temperature in kelvin

R molar gas constant=8.314atmmoldm^-3k^-1

4.972 × 9.583 =n × 8.314 × (31.8 + 273)

note I changed 31.8c to kelvin

making n subject of the formula

n=(4.972 × 9.583)/(8.314 ×(31.8 + 273)

n=(4.972 × 9.583)/(8.314 ×(304.8))

n=0.0188 moles

As per the chemical reaction ,sodium hydroxide can be used for neutralization of sulfuric acid as,2 NaOH+H₂SO₄\(\rightarrow\)Na₂SO₄ +2 H₂O.

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

Learn more about chemical reactions,here:

https://brainly.com/question/14929452

#SPJ1

Answer:

A) Is The Correct Answer

PLEASE MARK AS BRAINLIEST ANSWER