8. Blood circulation in warm-blooded
animals is an example of ___

The correct answer choice about the function of a nerve cell is: They send and receive electrical impulses.

The correct answer choice from the above is option b.

Nerve cells or neurons are are bundle of fibers which are connected through out the nervous system which helps detecting, recieving and sending information in informed.

The nerve cell are also known neurons are like electrical wires which runs throughout the body system in sending and receiving information.

So therefore, the correct answer choice about the function of a nerve cell is: They send and receive electrical impulses

Complete question:

Which of the following is a function of a nerve cell?

a. They released hormones

b. They send and receive electrical impulses

c. They are concerned with osmoregulation

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Answer:

Strong base

Explanation:

Answer: weak base

Explanation:

Answer:

The moons surface is changing

The pairings of the elements can be seen like Pair 1 : ( F , Br ), Pair 2 : ( Li , K ), Pair 3 : ( P , As ) is present where the pairs exhibit similar kind of chemical properties.

Following all the groups according to these periodic table (since these elements that belong to the same kind of group exhibit similar properties) we can build the following pairs:

The Pair 1: (F , Br ) → In here because both these elements belong to the Halogens group (Group number 17)

Pair 2: ( Li , K ) → Because of the similarity and presence of both the elements belong to the Alkali metals group (Group number 1)

Pair 3: ( P , As) → Because of the similarity and presence of both the elements belong to the Pnictogens group (Group number 15)

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Complete Question

Group the elements into pairs that would most likely exhibit similar chemical properties. It does not matter which pair of elements is pair 1, pair 2, or pair 3, so long as the correct elements are paired.

Pair 1 Pair 2 Pair 3 with the Answer Bank (K, S, Li, Br, Te, F)

D -The soil near estuaries is rich in nutrients, this is why estuaries have high biodiversity.

Because of the abundant food source and the efficient use of light energy by phytoplankton, which offers millions of plants and animals a tranquil haven from the open sea, estuaries have high primary output. The variety of ecosystems found inside estuaries supports a huge variety and number of organisms.

Estuaries produce a lot of primary material in part because of their physical makeup. It has a sizable surface area and more light penetrating through it.

A diversity of habitats are created in estuaries by the salinity gradient, variations in tides, freshwater, and concomitant flow in nutrients. These factors sustain a varied food web.

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The chemical equation that follows the law of conservation of mass is as follows: 2LiOH + H₂CO3 → Li₂CO3 + 2H₂O (option D).

The law of conservation of mass states that mass can neither be created nor destroyed.

This law further explains that in a chemical reaction, the amount of mass in the reactants must be equal to the amount of mass in the products.

This means that the chemical equation must be balanced i.e. the number of moles of atoms of each element on both sides of the equation must be the same.

According to this question, the chemical equation that is balanced is 2LiOH + H₂CO3 → Li₂CO3 + 2H₂O, therefore, represents the law of conservation of mass.

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Answer:

Bean Plant

Explanation:

This is because a bean plant produces it's own food.

The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation.

The three main elements of the rock cycle are metamorphism, erosion, and crystallization.

Crystallization:

In the earth or on the surface, magma cools and solidifies to form igneous rocks. Crystallization occurs as the magma cools, resulting in the formation of various crystals at various temperatures. For instance, olivine crystallizes from magma at temperatures substantially greater than those at which quartz does.

Sedimentation and Erosion:

Rocks at the surface of the Earth are broken down into smaller bits through weathering. These sediments are moved from one location to another by erosion in the form of running water, ice, and gravity. The accumulating sediment must be crushed and bonded together in order to form a sedimentary rock.

Metamorphism:

A rock undergoes metamorphosis when it is subjected to intense heat and pressure inside the Earth yet does not melt. The rock's texture and mineral makeup may change as a result of metamorphism. A metamorphic rock may therefore have a new mineral composition or structure.

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The ΔG° r×n is gven as - 1059.42 KJ

The chemical equation is given as :

[tex]6Cr{2}^{+} + Cr{2}O{7}^{2-} + 14H^{+} -------- > 8Cr^{3+} + 7HO{2}[/tex]

ΔG r×n = - nFEcell

Ecell =  Eoxidation + Ereduction

Eoxidation = -Ereduction =-(-0.50V) =  0.50 V

Ereduction = 1.33 V

Ecell  =  0.50 V + 1.33 V

         =   1.83 V

now, putting the value in formula

ΔGr×n = -nFEcell

where , n= 6 , f = faraday's constant = 96485 C/mol, Ecell = 1.83 V

therefore, ΔG r×n = - 6× 96487 × 1.83

                              = -1059.42 KJ

Now, ΔG°r×n = ΔG + RTlnQ

for standard condition Q = 1

hence ΔG°r×n = - 1059.42 KJ

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Answer:

It can be chemically separated if it is a compound. The gas carbon dioxide is a pure substance.

Explanation:

Carbon dioxide is a pure substance because it has a fixed composition no matter where it was taken. Each molecule of carbon dioxide will always have 1 carbon and 2 oxygens.

The most common isotope of chromium contains 28 neutrons in addition to its 24 protons and 24 electrons. Chromium is a strong, shiny metal with a bluish hue under normal circumstances. Thus, option C is correct.

There are four naturally occurring isotopes of chromium, with relative abundances of 4.35%, 83.79%, 9.50%, and 2.36% for 50Cr, 52Cr, 53Cr, and 54Cr, respectively.

Numerous Chromium isotopes are employed in medical procedures. The radioisotope Cr-51, which is used to gauge blood volume and red blood cell survival, is created from Cr-50.

Studies on (adult) diabetes and chromium metabolism both use Cr-53 and Cr-54 as research tools.

Therefore, chromium isotope contain  24 protons and 28 neutrons.

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Answer:

A) Ionic (Ag is a metal and F is a nonmetal)

B) Covalent (All elements are nonmetals)

C) Ionic (Fe is a metal and Cl is a nonmetal)

D) Covalent (All elements are nonmetals)

Answer:

Explanation:

1.55e+7

Consider one of the procedures where amylase and starch are reacting. If there is strong amylase activity and it is breaking down starch, then you would assign an enzyme activity level of 3.

The amount of starch left in a solution or the enzyme activity can both be used to assess the enzyme activity. By including compounds like iodine to the sample, which will express, through various degrees of the blue hue, the enzyme activity level, both of them can be done qualitatively.

In the majority of enzymatic tests, the rate of substrate consumption or product generation during a specified time period is used to compute the enzyme activity. The rate of NADH oxidation is watched in the case of PDC and ADH.

An enzyme-catalyzed reaction initially progresses at a faster pace as substrate concentration rises. This rise in reaction rate levels off as the substrate saturates the enzyme molecules.

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The classmate is correct with her statement about how red colour is seen but incorrect about how black colour is seen.

There are seven colours in light as follows:

However, we are able to see these colours based on which one is reflected or absorbed. A colour is seen when it is reflected. This means that a red colour will be seen when an object absorbs all other colour but reflects red.

However, when all the colours of light are absorbed without reflecting any, an object is seen as black.

Therefore, it can be concluded that the classmate is correct with her statement about how red colour is seen but incorrect about how black colour is seen.

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Climate change, Natural resource use, Waste production, Water pollution, Ocean acidification and Air pollution are the sustainability problems in Canada as well all over the world.

Climate change is the major change that occur in Canada because of the extensive use of fossil fuels and the release of other pollutants. This climate change leads to change the precipitation pattern in Canada. The extensive use of natural resource and production of waste material are also serious problems in Canada. Due to waste production, water is polluted because the waste is disposed in the water bodies which leads to acidification of ocean and serious threats to aquatic animals and plants.

So we can conclude that Climate Change, Natural Resource Use, Waste Production, Water Pollution, Ocean Acidification and Air Pollution are the sustainability problems in Canada as well all over the world.

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Yes, the aluminium foil is impure and contains a mixture of substances that affects the percentage yield as the impurities in it are added to the total weight of the end product.

In homes and commercial sectors, aluminium foil has many uses. It is used for storing food, baking cookies and cakes, and also as food wrappers.

People also use aluminium foil to store delicate food items such as meat and vegetables.

According to research, aluminium foil is not a pure substance as some of its particles leaches into food thus posing serious health problems.

This foil contains microparticles of iron, zinc, gallium and silicon. Moreover, the colouring and paint on it cause harmful impacts when it is exposed to heating.

Furthermore, it also affects the percentage yield by increasing the total weight of the end product.

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A 100 g mass is weighed three times on a balance and the following results are obtained: 95.0g, 94.9g, 95.1 g.

These measurements are precise because the answer are almost same and are slightly different from each other.

The given measurements are not accuracy because it shows how they both close the measurement is to be true for the accepted given value.

Where as

Precision shows to how measurement value of the similar substance or particles are to each other.

In this the outcomes agree with the one another.

Both the accuracy and precision shows the answer in most generic outcomes in an experiment.

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Answer:

uno

Explanation:

uno uno unooo no no Bruno capaso

The molecular formula of the compound is

[tex]N _{2}O _{4}.[/tex]

The empirical formula of the compound is,

[tex] \frac{30.4 \: g}{14.01 \: g \: mol^{ - 1} } = 2.17 \: mol \:of \: N[/tex]

[tex]\frac{69.6 \: g}{16.0 \: g \: mol^{ - 1} } = 4.35\: mol \: of \: O[/tex]

In the compound, 2.17 moles of Nitrogen are present.

In the compound, 4.35 moles of oxygen are present.

The empirical formula of the compound is

[tex]NO _{2}.[/tex]

The molecular formula of the compound is,

[tex]Molecular \: Formula = (EF) _{n}[/tex]

[tex] = 2 \times (14.01 + 2 \times 16.00) \: g \: mol ^{ - 1} [/tex]

n = 2

[tex]The \: molecular \: formula \: is \: N _{2}O _{4}[/tex]

and the compound is dinitrogen tetroxide. It is the dimer of nitrogen dioxide.

Therefore, the molecular formula of the compound is

[tex]N _{2}O _{4}.[/tex]

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The electric force is 2.33 × 10⁴⁹ times greater than the gravitational force.

Gravitational Force is defined as the force of magnet between any two bodies is directly commensurable to the product of their million and is equally commensurable to the forecourt of the distance between them.

Gravitational force is directly proportional to the weight of the two bodies.

Now,

The gravitational force in the middle of the proton and the electron is obtained from;

Fg = G m mp / r²

Where ,

me = mass of the electron

mp = mass of the proton

r = distance of separation

Fg = (6.67 x 10⁻¹¹ Nm² / C²) x (9.11 × 10⁻³¹) × 1.673 ×10⁻²₇/(1.8 × 10⁻¹⁰)²

Fg = 3.86 × 10⁻⁵⁸ N

For the electric force;

Fe=K e²/r²

Where,

K = electric constant

e = magnitude of charge on electron and proton

r = distance of separation

Fe = 8.988 × 10⁹x (1.602×10⁻¹⁹)² /(1.8×10⁻¹⁰)²

Fe = 7.10 × 10⁹ N

Hence, the number of time the electric force is stronger than the gravitational force = 9× 10⁻⁹ N/3.04 × 10⁻⁵⁸ N = 2.33 × 10⁴⁹times

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Answer:

9.2% is the answer

Explanation:

In this question asking for the percent error of the students calculated density. The formula that will be given;

density = 9.78g/cm^3

d = 9.78g/cm^3

accepted is on the RT table S = 8.96g/cm^3

%error = (measured - accepted)/accepted * 100%

%error = (9.78 - 8.96/8.96) * 100%

%error = 9.15% or approximately 9.2%

Bombardment of uranium-238 with a deuteron (hydrogen-2) generates neptunium-237 and 3 neutrons.

With the sign n or n0, the neutron is a subatomic particle with a neutral charge and slightly more mass than a proton. It is made up of two down quarks and one up quark as a composite particle. Atomic nuclei are  mainly composed of neutrons & protons.

They are both referred to as nucleons because protons and neutrons exhibit comparable behaviors inside the nucleus and have masses of around one atomic mass unit apiece. Nuclear physics describes these objects' characteristics and interactions.

The arrangement of electrons in orbit around an atom's heavy nucleus is a major factor in determining its chemical characteristics. The charge of the nucleus, or atomic number, which determines the number of protons, or protons, determines the electron configuration.

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This substance's state of matter is most likely Solid.

How can one tell if it is a good conductor of electricity or not?

The ability of the electricity to move the electrons through a material determines its conductivity; the more free electrons a metal has, the better it conducts electricity. Most good conductors are metals, and almost all the metals are solid.

If it is made up of electrons, protons, and neurons, the state of matter in this substance is most likely to be solid.

The substance's distinctive shape, which is a distinguishing characteristic of solids, was observed when it was tested in the lab. They are also excellent conductors of electricity. The common element found in every state of matter, electrons, protons, and neutrons, are present in solids. This entire information demonstrates its solidity.

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The similarity between law of conservation of mass and law of conservation of energy is that no new substance is created in both rather they are conserved.

Law of conservation of mass states that the mass can neither be created nor destroyed but is transformed from one form to another.

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.

When a toy car is rolled down a ramp the gravitational potential energy at the given height will be converted into kinetic energy of the toy car.

Thus, the similarity between law of conservation of mass and law of conservation of energy is that no new substance is created in both rather they are conserved.

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A 30 kg dog runs at a speed of 15 m/s.

What is the dog’s kinetic energy?

Answer: 3,400 J

A pure substance has a definite chemical formula. However, a mixture does not have a constant component ratio and hence cannot be described by a fixed formula.

A pure substance comprises only one type of matter. This can be a single element or a single compound, but each sample of this substance examined must have the same thing with a fixed, specific set of qualities.

In contrast, a mixture is referred to as a combination of two or more pure components. Because the atoms of the constituent substances are not chemically bound, mixtures may always be divided back into their constituent pure components.

Whereas a compound may have properties that are significantly different from the constituent's elements, however, mixtures retain their original properties.

Examples are chlorine, a strong green gas, and sodium, a soft, silvery metal. Together, these two elements can create sodium chloride (table salt), a white, crystalline substance that possesses neither the characteristics of sodium nor those of chlorine. However, if we combined ground pepper with table salt, we would still be able to distinguish the individual grains of each of them.

That's why pure substance has a definite chemical formula. However, a mixture does not have a constant component ratio and hence cannot be described by a fixed formula.

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The pumpkin mass 3060 g and weight in Jupiter is 75.9 N . so, the mass of pumpkin in earth is 3060 g and the weight of pumpkin is 30.0 N.

Mass will remain same in every planet but weight changes because of force of gravity. Mass do not change with change in place. Mass is measured as the amount of matter present in body.

mass of pumpkin will not change because the amount of matter does not change. the mass of pumpkin in Jupiter is 3060 g and it will remain same for earth , 3060 g.

Weight of an object is defined as the amount of force acting on a mass due to the acceleration due to gravity.

mass of pumpkin in earth = 3060 g = 3.060kg

Weight (W) = mass of object × acceleration of gravity

                   = 3.060 × 9 .86

                   =  30.0 N

thus,The pumpkin mass in Jupiter is 3060 g and weight in Jupiter is 75.9 N . so, the mass of pumpkin in earth is 3060 g and the weight of pumpkin is 30.0 N.

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The average atomic mass of neon will be 20.179 amu.

On adding the percentage of the mass of neon given we get,

90.51%+0.27%+9.22% = 100%

Consider masses,

M1= 19.992 amu

M2= 20.994 amu

M3= 21.991 amu

on taking them as fractions and considering them as X,Y and Z, we get,

X= 0.9051

Y= 0.0027

Z= 0.0922

Average atomic mass= X(M1)+Y(M2)+Z(M3)

= 0.9051(19.992) + 0.0027(20.994) + 0.0922(21.991)

= 18.095 + 0.0567 + 2.028

= 20.179 ≈ 20.18 amu

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