Why do scientists need a universal system to classify organisms?

Answer:

The molar mass and molecular weight of Sn(CO3)2 is 238.728.

Explanation:

Molar mass of any molecule can be calculated by adding mass of all individual atoms  that comprises the compound. The Molar mass of [tex]Sn(CO_{3})_{2}[/tex] is 238.72g/mol.

Molar mass is defined as mass of one mole of a molecule or compound. It's SI unit is g/mole. The other term that is used for molar mass is molecular weight, formula unit mass. Molar mass is extensive property as it depends on the mass of individual atoms that constitutes the molecule.

Mass of tin= 118.71 g.mol

Mass of Carbon=12g/mol

mass of Oxygen= 16g/mole

Molar mass of [tex]Sn(CO_{3})_{2}[/tex] = 1×mass of tin+2×mass of carbon+6×mass of oxygen

substituting all the values we get

Molar mass of [tex]Sn(CO_{3})_{2}[/tex] = 1×118.71+2×12g/mol+6× 16g/mole

Molar mass of [tex]Sn(CO_{3})_{2}[/tex] =118.71 +24+66

Molar mass of [tex]Sn(CO_{3})_{2}[/tex]=238.72g/mol

Therefore the Molar mass of [tex]Sn(CO_{3})_{2}[/tex] is 238.72g/mol

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Answer: nervous tissue connective tissue epithlial tissue muscle tissue

Explanation:

Answer: B

Explanation:

Answer:

B. Both substances must be the same temperature.

Explanation:

Answer:

Notify the teacher immediately.

Immediately wash off any chemicals on skin or eyes with cool running water.

Remain calm and help others remain calm.

Explanation:

Just did it on edge

Response to an accident can be made by informing the teacher, washing off chemicals ,being calm and picking of broken glasses.

Thus option A,C,D and E are correct.

While working in labs it is of utmost importance to work carefully while handling chemicals and glassware apparatus. In some unforeseen circumstances where accidents take place while working in labs it should be notified to the authorities immediately.

In case there is a spill of chemicals on skin or eyes it should be immediately washed under running water as the chemical spilled can cause irritation to the skin or eyes.In case of accidents  it is advised to remain calm and calm others as well.

If there is a breakage of glassware it should be immediately be thrown away in the trash as the glass can pierce  into the skin and cause injury.

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Answer:

See explanation

Explanation:

There are two chemicals commonly used to test for water. They are;

CuSO4: Anhydrous CuSO4  is white in colour, when it absorbs moisture, its colour changes from white to blue.

CoCl2: Anhydrous CoCl2 is blue in colour. when it absorbs moisture, its colour changes from blue to pink.

The __ increases by 1 as you go left to right across the periodic table.

A. Atomic mass

B. Atomic number

C. Number of neutrons

D. Number of ions

Answer C

Answer:

Mercury is released into the environment from many sources. Mercury becomes airborne when rocks erode, volcanoes erupt and soil decomposes. It then circulates in the atmosphere and is redistributed throughout the environment.

I think this is right.

Answer:

10.875 miles

So 87 minutes

.125 miles per minute

So just multiply int his case

87*.125

You’d get 10.875

Explanation:

done

..................

Answer:

Hydrolysis is a chemical wheathering process that may affect silicates and carbonates minerals. an example of such a reaction in which water reacts with a silicates minerals is the following: Mg2SiO4 + 4H2O ⇄ 2 Mg(OH)2 + H4SiO. olivine (forsterite) + water ⇄ brucite + silicic acid.

Explanation:

Answer:

Energy is released.

Explanation:

When an electron absorbs energy, it moves up into an excited state. When it releases energy, it will return to the ground state.

Answer:

Mg(HSO3)2 is Magnesium bicarbonate.

Answer:

Mg(HSO3)2: Magnesium Hydrogen Sulfite

Explanation:

Moles of Carbon dioxide : 13.5

Given

4.5 moles propane

Required

moles of Carbon dioxide

Solution

Reaction(Combustion of Propane) :

C₃H₈(g)+5O₂(g)→3CO₂(g)+4H₂O(g)

In a chemical equation, the reaction coefficient shows the mole ratio of the reacting compounds (either in reactants or products)

From the equation, mol ratio of Propane(C₃H₈) : Carbon dioxide(CO₂) : 1 : 3, so mol CO₂ :

= 3/1 x mol Propane

= 3 x 4.5 moles

= 13.5 moles

Answer: 1.5 x 10 24

Explanation:

One mole of NaCl contains 6.022 x 1023 NaCl formula units

In 2.5 moles of NaCl there will be basically 5 moles of ions as per the given data.

A material created by joining two or more distinct elements chemically in science.

A compound in chemistry is a material comprised of two or more separate chemical elements mixed together in a certain proportion.

Chemical connections that are challenging to break are created when the elements interact with one another.

2.5 mol of NaCl contains 5 moles of ions. This is due to the fact that 1 mol of NaCl contains 2 mol of ions, so you must multiply the molecular weight of the molecule by two to obtain the number of ions.

Thus, the answer is 5 moles.

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Answer:

Diffusion and Dispersion.

Explanation:

The two processes that took place in the given experiment are Diffusion and Dispersion.

When a crystal of potassium magnet is added placed in the bottom of a beaker which contains cold water, after 5 minutes the particles of potassium magnet will diffuse with water through diffusion process and the colour of water turns purple.

After few hours, the colour of solution goes light purple because the tiny particles which were diffused earlier will dispersed in the water and the particles will spread and make the solution lighter in colour.

Hence, the two processes are Diffusion and Dispersion.

Answer:

152.26 mmHg

Explanation:

pv=p'v'

525× 25=p'×86.2

p'=525×25÷ 86.2

p'=152.26

Answer:

D. Thermometer

Explanation:

The equipment used to measure the temperature of any reaction is the thermometer.

A thermometer is any device that has been specifically calibrated to measure the temperature values of reaction.

Answer: KL

Explanation:

The side of Figure T' that is congruent to side 1 of Figure S using relevant transformations is; KL.

When rotating a shape 90° clockwise, it is expressed as;(x, y) → (y, -x).

When reflecting the image over the y-axis, it is expressed as (x, y) → (-x, y).

Carrying out the two transformations would mean that we are reflecting a shape over the y = -x line, where;

(x, y) → (-y, -x).

Thus, the side of Figure T' that is congruent to side 1 of Figure S is KL.

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Answer:

Phosphorus sesquisulfide, free from yellow and white phosphorus appears as a yellow crystalline solid. Easily ignited by friction. Forms sulfur dioxide and phosphorus pentaoxide during combustion. Reacts with water to form phosphoric acid, a corrosive material. Used to make matches and in the manufacture of other chemicals.

Explanation:

Answer:

F, Cl, Br, I because all elements found in group 7 which is halogen.

Answer:

F, Cl, Br, I

Explanation:

Because theyre all in the same family. :)

Answer:

I'm going to have to go with double displacement. Sue me if I'm wrong.

Explanation:

Synthesis? No. There would have to be one product, not two.

Decomposition? No. There would have to be one reactant, not two.

Single displacement? No. There are two elements/compounds that are switching places.

Double displacement? Highly likely. From the reactants' side to the products' side, nitrate and iodine switch places.

Neutralization? Uh, I don't think so. I can't remember why, though.

Combustion? No. O₂ would have to be one of the reactants.

Lead nitrate + potassium iodide(?) ==> lead iodide(?) + potassium nitrate

To solve this we must be knowing each and every concept related to  standard deviation. Therefore, 30.3 is the standard deviation of this data set. The correct option is option C.

In descriptive statistics, the standard deviation measures how widely the data points vary from the mean. It describes how values are distributed throughout the information sample and calculates how widely apart data points are from the mean.

Mathematically,

73+70+80+12+98+27 =360

mean of observations = 360/6=60

deviations from the mean

(73−60), (70−60), (80−60), (12−60), (98−60),  (27 −60)=13, 10, 20, -48, 38, -33

standard deviation (σ) formula can be given as

σ=√(13)²+(10)²+(20)²+(-48)²+(38)²+(-33)²/6

On calculations, we get:

σ=30.3

Therefore, 30.3  is the standard deviation of this data set. The correct option is option C.

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Tungsten is an element. It is located in the d -block of periodic table. Thus it is a transition metal. Hence, option B is correct.

Tungsten is 74th element in periodic table. It is a transition metal thus, located in the d-block of periodic table. Tungsten has the chemical symbol W. Tungsten was first identified as an element in 1781.

The maximum melting temperature of any known element other than carbon, 3,422 °C, is reached by the unbound element, making its resistance all the more remarkable (which sublimes at atmospheric pressure). Tungsten has a boiling point of around 5930°C.

A few of the many alloys that contain tungsten and have many applications include radiation shielding, X-ray tubes, electrodes in gas tungsten arc welding, superalloys, and incandescent light bulb filaments.

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Answer:

Nitrogen is an element that can combine with itself or with other elements to make different compounds. For instance nitrogen gas, N2, is a compound made when two nitrogen atoms form a chemical bond.

Explanation:

Answer:

element

Explanation:

it can combine with itself or with other elements to make compounds

Answer: Im pretty sure its C. or can exactly replicate the procedure

Explanation:

Answer:

it's c I took the test on my but

Answer:

A. the right side

Explanation:

Taking into account the definition of covalent bond, the correct answer is option A.) right side of the periodic table contain atoms that form covalent bonds.

The covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule. Covalent bonds are established between non-metallic elements. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas. The shared electron pair is common to the two atoms and holds them together.

In other words, a covalent bond is a force that joins two atoms of non-metallic elements to form a molecule. Atoms share pairs of electrons from their valence shell to achieve the stability of the molecule formed. The tendency of the elements to reach a stable configuration is known as the octet rule.

Finally, since the nonmetallic elements are found on the right side of the periodic table, the correct answer is option A.) right side of the periodic table contain atoms that form covalent bonds.

Learn more:

Answer:

all

Explanation:

water vapor is everywhere

ice is in the freezer and hopefully you drink water.