percent error: a balance measured the mass of 1.0000g & its standard measurement is 0.9981g

According to the graph, increasing the temperature of the solution will increase the solubility of KBr.

There is direct relationship between solubility and temperature because if one increases the other decreases whereas if one decreases the other is also decreases. The higher temperature of the solution is, the easier a solid will be able to dissolve in that solution while on the other hand, the lower is the temperature of the solution, the solid will not dissolve easily. In the graph, we can see that the line of KBr moves in the upward direction which clearly shows that with increasing temperature, the solubility of KBr is also increases.

So we can conclude that According to the graph, increasing the temperature of the solution will increase the solubility of KBr.

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Answer:

The moons surface is changing

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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If the density of nickel is 8.9 g/cm3, it occupies 0.15 cubic decimeters in 1335 grams of nickel.

Density is defined as the mass of a unit volume of a material substance, the space occupied by the unit mass of a material. It is the degree of compactness measured by the quantity of mass per unit  volume.

density = mass/ volume

volume = mass/ density

here the given mass is = 1335 grams

and the density given is = 8.9

=1335/8.9

=150

therefore volume calculated is 150 cubic centimeter

1 cubic centimeter is equal to 0.001 cubic decimeter

150 cubic centimeter is equal to 0.15 cubic decimeter

If the density of nickel is 8.9 g/cm3, it occupies 0.15 cubic decimeters in 1335 grams of nickel.

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

What is the dog’s kinetic energy?

Answer: 3,400 J

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:

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%

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 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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The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay.

Only the conjoining Missouri is longer than the second-longest river in the US, the Mississippi, which also supports a $12.6 billion shipping sector and 35,300 employment nationwide. It is one of the largest waterways in the world, transporting goods and food for the entire planet.

Water is a valuable resource that is used in a wide variety of ways because of its unique properties. Water is essential to all life for survival. Without fresh water, people cannot endure for longer than five to seven days.

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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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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.

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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We intend to prepare 500 ml of a 0.1m solution of NaCl, but you forget to remove the stir bar when we bring the solution to volume. the stir bar has a volume of 1 ml and weighs 4 g, the percent error in our molarity is 0.2%.

Percent errors indicate how big our errors are when we measure something in analysis process. Smaller percent errors indicate that we are close to accepted or original value.

For example, a 1% error indicates that we got very close to accepted value, while 48% means that we were quite a long way off from the true value. Measurement errors are often unavoidable due to certain reasons like hands can shake, material can be imprecise, or our instruments just might not have capability to estimate exactly.

The percent error formula will let us know how seriously these inevitable errors influenced our results.

Percent error is difference between estimated value and the actual value in comparison to the actual value and is expressed as a percentage. In other words, the percent error is relative error multiplied by 100.

The percent error formula

Formula for percent error is:

PE = (Estimated value-Actual value|/ The Actual value) × 100

0.1% M NaCl

Amount of NaCl require to prepare 0.1M NaCl calculated:

M1= [tex]\frac{1000*x}{58.5*500}[/tex]

x= 2.95g

but stir bar consume 1ml so actual value of solution is not 500ml but it is 500-1= 499ml

so, molarity= [tex]\frac{1000*2.925}{58.5*499}[/tex]

M2= 0.1002M

%error= [(M1-M2)/M1]*100

          =0.2%

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Fire. It's all fun and games until someone ignores the Bunsen burner! ...

Heat Burns. Handling hot items hastily without the proper tools can result in serious burns. ...

Chemical Burns. ...

Cuts and Scrapes. ...

Contamination. ...

Inhalation. ...

Spills and Breaks.

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 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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Answer:

Bean Plant

Explanation:

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

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:

uno

Explanation:

uno uno unooo no no Bruno capaso

Thomson suggested that an atom's model resembling a plum pudding,

According to Thomson, an atom consists of a positively charged sphere with embedded negatively charged electrons. and an atom is electrically neutral because the positive and negative charges within it are of equal magnitude.

J.J. Thomson used a Crookes, or cathode ray, tube to conduct experiments that led to the discovery of the electron in 1897. He provided evidence that cathode rays have a negative charge. He also investigated positively charged neon gas particles. Thomson discovered that positively or negatively charged particles were not included in the conventional atomic model. As a result, he suggested a plum pudding-like model of the atom. The raisins in the dessert were the negative electrons, and the positive charge was in the dough.

The positive charges in the atom were not recognized as particles by Thomson's model of the atom, despite the fact that it did explain some of the electrical characteristics of the atom due to the electrons.

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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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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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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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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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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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