pls answer I I’ll give u brainliest

The sample is undergoing chemical change.

When one chemical material changes into one or more others, as when iron rusts, this is referred to as a chemical change.

There are five signs that shows us that the object is undergoing chemical change-

1. Change of colour

2. Change of temperature

3. Gas evolution

4. Precipitate formation

5. Production of smell

Therefore According to the given question the sample is giving off a solid precipitate of black colour. Also, there is evolution of gas so the given sample is undergoing a chemical change.

Additionally, this is a type of Decomposition reaction where in the gas evolved is a Carbon dioxide. Also the given sample is a Compound because two products are formed.

Hence, it is a chemical change.

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0.125

a radioactive isotope with a half life of 2 seconds, how much of a 50 Ci sample of the isotope will remain after 6 seconds

as per the statement, we have got

The half life period is 2 second

6 second  =2 sec / 6 sec ​= 3 half life periods.

The fraction of the material would remain after 6 second is

[tex]\frac{1}{2^3}[/tex] ​ =   1 / 8 = 0.125

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The pH of a solution with a [H3O+]  is 4.9 .Thus option (b) is true.

pH is defined as negative log of H3O+ ion construction.

The pH can be calculated using formula:

pH = - log [H3O+].

[H3O+] = 7.5 x 10-4 M

pH = - log[7.5 x 10-4M]

pH = 4.9

The pH of a solution with a [H3O+] = 9.4 x 10-7 M = 2.6 = (a)

The pH of a solution with a [H3O+] = 3.7 x 10-14 M = 4.9 = (b)

The pH of a solution with a [H3O+] = 4.2 x 10-2 M = 2.6 = (a)

Thus, the pH of a solution with a [H3O+]  is 4.9 .Thus option (b) is true.

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The density of a substance (in g/dL) of a sample with a mass of 8.3 x 10-¹ dag and a volume of 4.10 mL is 202.44g/dL.

The density of a substance is the measure of the mass of matter contained by a unit volume.

The density of a substance can be calculated by dividing the mass of the substance by its volume.

According to this question, a substance with a mass of 8.3 x 10-¹ dag has a volume of 4.10 mL. The density can be calculated as follows:

Density = 8.3g ÷ 0.041dL

Density = 202.44g/dL

Therefore, the density of a substance (in g/dL) of a sample with a mass of 8.3 x 10-¹ dag and a volume of 4.10 mL is 202.44g/dL.

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A material changes physically when its state changes. They don't involve any alterations to the matter's chemical composition and are reversible. State changes that occur frequently include melting, freezing, sublimation, deposition, condensation, and vaporization.

Which arrow would most likely represent the phase change that involves the same amount of energy as arrow 1?

"Arrow 4."

The energy required to go from a liquid to a gas is equivalent to that required to go from a gas to a liquid.

The process by which a substance transforms from the liquid phase to the gaseous state is known as boiling.

Diagram of water in phase:

Water changes from a liquid to a gas through the phase-shifting process of evaporation (water vapor).

Water changes its state from a gas to a liquid during the phase shift process known as condensation, and the resulting vapor turns into a cloud.

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Answer: arrow 4

Explanation: just took the test ;-)

Answer:

Yes, it can be separated through evaporation. It retains its original properties.

Explanation:

The micromorphology is a process  we are going to use to find an organisms in that dirt sample.

Micromorphology is defined as the fine level structure or morphology of an organism, mineral, soil and dirt component visible through microscope.

It is the microscopic study of soil, dirt and sediments.

It is a branch of soil science that is concerned with the description, interpretation and to a increasing extant the measurement of components,  features and fabrics in soil or dirt at microscopic level.

Thus, the micromorphology  is a process  we are going to use to find an organisms in that dirt sample.

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Answer:

6 metres per second squared

Explanation:

Gain in velocity = 60 - 30 = 30 m/s.

Time taken for this gain = 5 seconds

Average acceleration = 30 / 5 = 6 m/s/s.

So, 6 metres per second squared.

The pOH of a solution that contains the given volume and mass is 1.690.

To calculate pOH of sulfuric acid we must know the moles and concentration.

So, to calculate moles using formula,

moles = mass / molecular mass

Given,

mass = 3.5 g

volume = 1.75 lit

So,

moles of sulfuric acid = mass / molecular mass

Putting values,

moles of sulfuric acid = 3.5g / 98.079 g/mol

moles of sulfuric acid = 0.0357mol

Now to know the concentration we are using the formula,

Concentration of sulfuric acid = moles / volume

Putting values,

Concentration of sulfuric acid = 0.0357mol / 1.75l

Concentration of sulfuric acid = 0.0204 mol/l

pOH + pH = 14

pOH = -log(0.0204)

pOH = 1.690

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CCC Pattern compare the ions of elements listed in the table with the atoms of the element. Based on the patterns in their particle compositions and charges, the definition of ion would be that CCC pattern compare ions of elements.

An ion is a structure in crystal system having regular repeating arrangement, which can be called as an ionic lattice.

Lattice is formed because ions attract each other and form a regular pattern with oppositely charged ion next to each other.

An atom is the smallest unit of an element that retains the chemical properties of element. Every atom includes a nucleus, generally containing both positively charged particles called ions and uncharged particles called ion.

In the space surrounding, the nucleus are negatively charged particles called electron.

Therefore, ions are oppositely charged particles in lattice.

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The cost of a 5.5kg milkshake if 9.7 ounce milk shake costs $3.45 is $68.915.

Cost of 9.7 ounce milk shake = $3.45

One pound is equal to 16 ounces.

1ounces contain 1/16 pound.

9.7 ounces contain (1/16) × 9.7 pound.

9.7 ounces contain 0.606 pounds.

Cost of 0.606 pounds milk shake = $3.45

1 pound = 454g.

0.606 pounds = 454 × 0.606g

0.606 pounds = 275.12g

1gram = 10^-3 kilo gram

275.12 gram = 275.12 × 10^-3 kilo gram

So, cost of 0.27512 kg milk shake = $3.45

cost of 1 kg milk shake = $3.45/ 0.27512 = $12.53

cost of 5.5 kg milk shake = $12.53 × 5.5 = $68.915

Thus, we calculated that the cost of a 5.5kg milkshake if 9.7 ounce milk shake costs $3.45 is

$68.915.

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Answer: 16.7 pounds of mercury

Explanation:

556 mL * 13.6 g/mL=

556 mL * 13.6 g/1 mL=

556 * 13.6/1=

556*13.6=

7561.6 g=

7561.6 g * 1 pound/453.592 g=    ==> 1 pound=453.592 grams

7561.6 * 1/453.592=

7561.6/453.592=

16.67=16.7 pounds of mercury

The measure of how densely a material is packed together is called density. As the mass per unit volume, it has that definition. The mass in pounds of mercury is 16.635 pounds.

The term "density" refers to the ratio between the volume (the amount of space an object or substance occupies) and the mass (the quantity of material it contains). Density can also be defined as the quantity of mass per unit of volume. A dense object is one that is both hefty and small.

Density is the measure of an object's mass per unit volume. Kilograms per cubic meter (kg/m³) is the SI unit for density.

Density = Mass / Volume

13.6 g/mL = (m) / (556 mL)

m = 13.6 g/mL × 556 mL

m = 7561.6 g

1 g = 0.0022 pound

7561.6 g = 16.635 pounds

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Answer:

?

Explanation:

Is there supposed to be a picture or is that only 5he question?

Sodium is a metal that belongs to group 1 of the periodic table.

My favorite element is sodium. Sodium is found in group one of the periodic table. The element is univalent and also forms univalent positive ions. Like every other metal, sodium is able to react with dilute acids to liberate hydrogen gas.

Sodium is a light metal and is known to react with mercury to form the sodium mercury amalgam which is obtained during the electrolysis of sodium chloride. All of the compounds that are formed by sodium are ionic in nature. However the hydrides of sodium are unstable.

Sodium is highly reactive thus it must not be exposed to air since it could ignite spontaneously in air. As such, sodium must be stored under paraffin oil. All the compounds of sodium are ionic in nature.

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Halogens are p-block elements, group IIA & alkali metal belongs to s-block and nonreactive elements are known as noble gases.

Chemical elements are listed on a periodic table according to their atomic number. Carbon and oxygen are two of the chemical elements listed in the periodic table.

The Periodic Table groups the elements according to their linked chemical and physical properties. The table consists of rows and columns. Vertical columns of the periodic chart represent groups. The table displays periods as horizontal rows.

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Explanation:

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The mass of 3.2 mL of a liquid with specific gravity of 0.986 is 3.155 g

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

With the above formula, we can determine the mass of the liquid. Details below

The following data were obtained from the question:

Density = mass / volume

Cross multiply

Mass = Density × Volume

Mass of liquid = 0.986 × 3.2

Mass of liquid = 3.155 g

Thus, the mass of the liquid is 3.155 g

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The species that would make the BEST bioindicator is option C: Species B, a hardy bacterium that lives in the reservoir and is able to tolerate a wide range of pH’s and water temperatures. Species B, a hardy bacterium that lives in the reservoir and is able to tolerate a wide range of pH’s and water temperatures.

Humans, animals, and the environment are known to be the constituent of reservoirs. The source from which an agent is moved to a host may or may not be is known to be the reservoir.

For instance, since the soil serves as the reservoir for Clostridium botulinum, such that canned food harboring C. botulinum spores is the main reason of botulism diseases.

Therefore, The species that would make the BEST bioindicator is option C: Species B, a hardy bacterium that lives in the reservoir and is able to tolerate a wide range of pH’s and water temperatures. Species B, a hardy bacterium that lives in the reservoir and is able to tolerate a wide range of pH’s and water temperatures.

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Answer:

Explanation:

It is A because the electrice flows through the cord to give energy for the blades to move.

The number of electrons for sulfur, selenium, tellurium, and polonium will have in their outer shell is 6,6,6,6 respectively.

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Answer:

High humidity

Warm

High Pressure.

Answer:

Relative Humidity: high

Air Temperature: warm

Air Pressure: low

The calculated energy is 3.97×10⁻²¹J

A single photon has an energy of hv or = (h/2), where h is the Planck constant of 6.626 x 10-34 Joule-sec. If the photon's frequency is known, we may apply the formula E = h f to determine a photon's energy. The equation E = h c can be used to determine a photon's energy if its wavelength is known.

The photon has a 3.97 1021 J energy.

E=hf, with

Planck's constant is h, and the photon's frequency is f.

The second equation is f=c, where c is the speed of light and is the photon's wavelength.

F=c, so we can write

E=hcλ

=6.626×10⁻³⁴J⋅s×2.998×10⁸m⋅s⁻¹/5.00×10⁴×10⁻⁹

=3.97×10⁻²¹J

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Answer:

the atomic weight of mass is 196.96657 u

Neutrons have a neutral charge, a mass of 1 amu, and are found in an atom's Nucleus , Protons are a little smaller than neutrons, they still have a mass of 1 amu though. They are found inside an atom's nucleus and carry a positive charge, Electrons almost have no mass, it's so small we say it is 0 amu. They sail around the nucleus in the orbit, They have a negative charge

Atoms of all elements except for most atoms of hydrogen have neutrons in their nucleus unlike protons and electrons, which are electrically charged, neutrons have no charge they are electrically neutral. that's why the neutrons in the diagram above are labeled  n⁰ and the zero stand for zero charge neutron has a neutral charge

Protons are found in the nucleus of the atom and this is a tiny, dense region at the center of the atom protons have a positive electrical charge of one  (+1)  and a mass of 1 atomic mass unit proton carry positive charge in the nucleus of atom

Electrons are one of three main types of particles that make up atoms and protons and neutrons, which consist of smaller, simpler particles, electrons are fundamental particles that do not consist of smaller particles electron has 0 amu and they have negative charge around the nucleus in the in the orbit called electron

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Answer: pure water is homogeneous and pure substance.

Explanation: However, when a homogeneous substance consists of two or more different types of molecules uniformly intermingled with one another, then it’s called a homogeneous mixture. A mixture’s composition can vary, but a pure substance does not.

Answer:

True

Explanation:

since the gases and minerals dissolved in water are in the same state as water and they do not form separate layers

The observation shown in the image is qualitative.

Chemical analysis will be;   Qualitative

In a qualitative chemical analysis, we can  determine the components of a substance. In a quantitative analysis, we want to determine the amount of every  of the components of a substance. Both sorts of analysis are of very much  important in chemistry.

From the image, we could  observe a change in color . Qualitative analysis might  be carried out by the  use of chemical reagents which could give positive tests like  as  change  in color to show the presence or absence of some  constituents of a  given substance.

Qualitative analysis provides the  details of the presence or nonappearance of different chemical components in a unknown sample. Qualitative chemical analysis,  deals with the branch of chemistry identification of elements or grouping of elements provided in a sample. This  techniques employed in qualitative analysis vary in complexity, depending on the nature of the sample

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Answer:

115.21 degrees Celsius

The orbital diagram is shown below ,

The [tex]Cd^{+2}[/tex] ion is diamagnetic .

The Atomic number of Cd = 48

Electronic configuration of Cd is is [tex]1s^{2} 2s^{2}2p^{6} 3s^{2} 3p^{6} 3d^{10} 4p^{6} 4d^{10}5s^{2}[/tex] .

After the removing two electrons from Cd , Cd gets two positive charges and becomes   [tex]Cd^{+2}[/tex] .

The electronic configuration of  [tex]Cd^{+2}[/tex]  is  [tex]1s^{2} 2s^{2}2p^{6} 3s^{2} 3p^{6} 3d^{10} 4p^{6} 4d^{10}[/tex] .

The  [tex]Cd^{+2}[/tex] has no unpaired electron . Hence , it is diamagnetic in nature .

The orbital diagram of  is shown as follows,

The shell structure of a cadmium atom, which has 48 electrons, is 2.8. 18.18.2. Ground state gaseous neutral cadmium has the electron configuration [Kr] in its ground state.

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