A fixed mass of gass occupies a volume of 200cm at 21°c calculate it's volume at standard temperature
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Answer:

4.4 × 10^-7

3 × 10^5

Explanation:

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The pressure of the carbon dioxide that is allowed to sublime in atm, is 2.463 atm

The pressure of the gas can be obtained by using the ideal gas equation as illustrated below:

PV = nRT

P × 1 = 0.1 × 0.0821 × 300

P = 2.463 atm

Thus, the pressure of the gas is 2.463 atm

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Answer:

yes, coal for example produces energy by burning but there are several alternatives such as water or solar which are 2 growing energy sources.

Explanation:

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Answer:

a. Calcium

Explanation:

Strontium and Calcium are both in the same group, Group 2.

Answer:

Calcium and strontium are in the same group.

Group 2a of the perodic table are the alkaline earth metals

Answer:

Boiling of pure water is not a chemical reaction.

It is a physical change from liquid state to gaseous state.

Explanation:

Answer:

Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out. Polar solvents have large dipole moments (aka “partial charges”); they contain bonds between atoms with very different electronegativities, such as oxygen and hydrogen. Non polar solvents contain bonds between atoms with similar electronegativities, such as carbon and hydrogen (think hydrocarbons, such as gasoline).

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Balanced equation: C₂H₄ + 3O₂ → 2CO₂ + 2H₂O

O₂ required: 3/1 x moles C₂H₄ = 3/1 x 6.51 = 19.53 moles

Answer:

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Answer:

12, 12, 12, edge 2022!

Explanation:

Answer:

How many electrons does the iron half-reaction lose? 12

How many electrons does the oxygen half-reaction gain? 12

What is the total number of electrons that are moved in this oxidation-reduction reaction? 12

Answer:

The  percent  composition  of barium  in  barium chloride   is 65.9%

Explanation:

percent   composition  =  molar weight  of barium/molar weight  of barium chloride  x 100

from  periodic table the molar weight of barium = 137.3

and the  molar weight  of   BaCl2  = 137.3 +( 35.5 x 2)=208.3

% composition  is therefore = 137.3/208.3 x 100=65.9%

Answer: When two light bulbs are connected in parallel, which is true? A. The total resistance is less than the resistance of either bulb alone. B. The Voltage provided

Explanation:

Answer:

D. Only the top two bulbs would be lit.

Explanation:

When you connect the top light bulb, both the top and middle light bulbs will be lit. But, the bottom light bulb will not be lit because it is not connected. In order for a light bulb to be lit, it has to be connected on both sides by wire.

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Answer:

2 Gc + 1 Mm + 3 Ch → 1 Gc2MmCh3

Note:

is this the s'more reaction?

-If not might there be a typo?

- if so, might it be one of these?

Answer:

1.Yes, it would be found in nature, 1:1 ratio of proton=neutron.

2.No, since it is more likely for atoms with an atomic number greater than 50 to have a 1.5:1 ratio.

Explanation:

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1. Yes, it would be found in nature, 1:1 ratio of proton=neutron.

2. No, since it is more likely for atoms with an atomic number greater than 50 to have a 1.5:1 ratio.

No, since it is more likely for atoms with an atomic number greater than 50 to have a 1.5:1 ratio.

The ratio of neutrons to protons (n/p) is a successful way of predicting nuclear stability. This ratio is close to 1 for atoms of elements with low atomic numbers (of less than about 20 protons). The n/p ratio steadily increases as the atomic number increases past element 20 (calcium) to about element 84 (polonium).

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Answer:

Dalton theorized that the law of conservation of mass and the law of definite proportions could be explained using the idea of atoms. He proposed that all matter is made of tiny indivisible particles called atoms, which he imagined as "solid, massy, hard, impenetrable, movable particles.

Explanation:

Answer:

A

Explanation:

Since water is polar, we need for there to be a polar solute. This eliminates options B and D.

Now to choose between A and C, we can look at the compounds mentioned.

For A, NH3 is mentioned, which is a polar substance.

However, for C, H2 is mentioned, which is a nonpolar molecule, contrary to what is stated by the option.

Therefore, A is the answer.

The heat released by the combustion of the naphthalene is mathematically given as

H=2.508975 KJ

Question Parameters:

0.25 g of the organic compound naphthalene

The calorimeter increases from 24.00°C to 26.43 °C.

The calorimeter's heat capacity is 4.13 kJ/°C

Generally, the equation for the  Heat released  is mathematically given as

H = mCdT

Therefore

H= mC ( T2 - T1)

H= 0.25*4.13  ( 26.43- 24)

H= 2.508975 KJ

In conclusion, the heat released by the combustion of the naphthalene is

H=2.508975 KJ

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Answer:

Lithium has two naturally occurring isotopes. Lithium-6 has an atomic mass of 6.015 amu. Lithium-7 has an atomic mass of 7.016 amu. The average atomic mass of lithium is 6.941 amu.

Explanation:

Answer:

Matter can exist in one of three main states: solid, liquid, or gas.

Solid matter is composed of tightly packed particles.

Liquid matter is made of more loosely packed particles.

Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume.

Explanation:

The amount of W(OH)2 needed would be 448.126 g

From the equation of the reaction:

W(OH)2 + 2 HCl → WCl2 + 2 H2O

The mole ratio of W(OH)2 to HCl is 1:2

Mole of 150g HCl = 150/36.461

                                 = 4.11 moles

Equivalent mole of W(OH)2 = 4.11/2

                                           = 2.06 moles

Mass of 2.06 moles W(OH)2 = 2.06 x 217.855

                                                = 448.188g

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Answer: 0.035 M

Explanation:

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Answer:

minerals can be extracted from recycled electronics

Explanation:

The which is true about electronic waste is minerals can be extracted from recycled electronics.

The waste which are the residue of the electrical devices which we used in our daily life is known as electronic waste.

In the electrical devices many metals and non metals are present and when we recycle this electrical waste then again we get that useful materials from the waste in the form of minerals, because all that metals, non metals or any other element will get in combined form.

Hence, option (d) is correct.

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Answer:

Polonium-207

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Taking into account the definition of ionic bond, Li loses 1 valence electron and becomes a positive ion and Cl gains 1 valence electron and becomes a negative ion.

An ionic bond is a type of chemical bond that occurs when one atom gives up an electron to the other, in order for both to achieve electronic stability.

This union normally occurs between metal and nonmetal elements with different electronegativity, which means that the elements have different capacity to attract electrons.

In other words, an ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion.

Li is a metal, while Cl is a nonmetal. Considering the definition of ionic bond, the Li gives up its electrons forming a cation to the Cl, which forms an anion.

In summary, Li loses 1 valence electron and becomes a positive ion and Cl gains 1 valence electron and becomes a negative ion.

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Answer:

100grams

Explanation:

law of conservation of mass

if the chemical or whatever, quantity is given then it stay the same in the beginning and the end. Just add them in the end and if something is missing that means you have done something wrong i am just telling for experiment