why can't you balance CaC2 + H2O > Ca(OH)2 + CH4?

Answer:

23: 6000560000000

24: 0.0015

25: 200

26: 0.0105

27: 600

28: 4023000

Explanation:

You have to move the decimal the same amount of times as the exponent says.

For example, like with the 6, you move it 2 decimals to the right (since it's positive), and the regular number would be 600.

Answer: I am sorry i couldnt answer but this question is beyond me

Explanation:

We have that  the time that will have elapsed when 25.00 grams remains is

T=72hours

From the question we are told

100.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How much time will have elapsed when 25.00 grams remains?

Generally the equation for the Half life  is mathematically given as

Where

[tex]X=\frac{25}{100}\\\\X=0.25\\\\Therefore\\\\\frac{1}{2}^n=0.25\\\\n=2 half lives[/tex]

Therefore

T=2*36

T=72 hours

Hence

 the time that will have elapsed when 25.00 grams remains is

T=72hours

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At 20°c, a 0.376 m aqueous solution of ammonium chloride has a density of 1.0045 g/ml. The mass percent of the ammonium chloride in the solution is 2.003%.

The number of moles of a substance can be estimated as:

[tex]\mathbf{number\ of\ moles = \dfrac{mass}{molar \ mass}}[/tex]

Given that:

Mass = number of moles × molar mass

Mass = 0.376 × 53.50

Mass = 20.116 grams

In one mL of ammonium chloride; the grams of ammonium chloride is:

[tex]\mathbf{= \dfrac{20.116 \ grams}{1000 \ mL}}[/tex]

= 0.020116 g/mL

The mass of ammonium chloride in the solution can be computed as:

[tex]\mathbf{=(\dfrac{mass \ of \ NH_4Cl}{density \ of \ the \ solution})\times 100}[/tex]

[tex]\mathbf{=(\dfrac{0.020116 }{1.0045})\times 100}[/tex]

= 2.003%

Therefore, we can conclude that the mass percent of the ammonium chloride in the solution is 2.003%.

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There are more than 118 naturally occurring elements.Seventy five percent of the universe is Carbon .The earths's crust and human body are made of different elements.But Carbon is an element which is abundant in both.Most objects are made of Carbon with approximately one million Compounds known and over being developed and discovered every year.

Answer:

it will help you , but I am not sure it is correct

Answer:

protons and electrons attract each other.

Explanation:

neutron as no charge,  proton and electron are exactly the same size but opposite. ( the opposite charge attract)

The protons possess a positive charge so they attract negatively charged electrons.

A proton can be described as a stable subatomic particle, a symbol with a positive charge of +1e elementary charge. Proton's mass is slightly less than that of a neutron but 1836 times the mass of an electron.

Protons and neutrons are jointly referred to as "nucleons" each with masses of approximately one atomic mass unit. More than one proton can be present in the nucleus of an atom. They give the attractive electrostatic central force which holds the atomic electrons.

The number of protons in the nucleus is referred to as the atomic number and is represented by the symbol Z. Since each element in the modern periodic table has a unique number of protons, its own unique atomic number, determines the chemical characteristics of the element.

As the neutrons are neutral do not carry any charge so the protons do not attract neutrons.

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#SPJ2

Answer:

9.55 moles

Explanation:

How many moles are equivalent to 5.75x1024 atoms of Al? 9.55 moles contain 5.75 x 1024 atoms of Al

Answer:

nervous tissues

Explanation:

Nervous tissue is found in the brain, spinal cord, and nerves. It is responsible for coordinating and controlling many body activities. ... The cells in nervous tissue that generate and conduct impulses are called neurons or nerve cells. These cells have three principal parts: the dendrites, the cell body, and one axon

credits to the person who provided this info.

Since we weren't given the moles of hydrogen, we have to find it. However, we can do it all in one step if we set up the equation correctly.

Since   Mass = moles × molar mass

&         Moles = #molecules ÷ Avogadro's Number

∴ mass = (#molecules ÷ Avogadro's Number) × molar mass

            =  (3.7 × 10⁴⁵ mcules ÷ (6.022 × 10²³ mcules/mole)) × 1.008 g/mol)

            = 6.19 × 10²¹ g

Answer:

hydrogen bonding

Explanation:

The strongest among them is hydrogen bonding, and the weakest are London dispersion forces.

The strongest intermolecular force to overcome when ethanol is converted from liquid to a gas is hydrogen bonding.

Intermolecular forces are forces that are a weaker force of attraction than intramolecular forces.

Intermolecular forces are forces between molecules and hold these molecules together.

Hydrogen bonding is an example of intermolecular forces between the OH group in the alcohol.

During the conversion of ethanol from liquid to gas state,  hydrogen bonding occurs between the partial negative charge in the oxygen and the partial positive charge in the hydrogen.

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Answer: As hand sanitizer dries, it evaporates into gas, which can also catch fire. That’s why the experts recommend that people avoid lighters, matches and fires after using hand sanitizer.

Explanation:

Explanation:

A medida que se seca el desinfectante de manos, se evapora en gas, que también puede incendiarse. Es por eso que los expertos recomiendan que las personas eviten los encendedores, fósforos y fuegos después de usar desinfectante para manos.

Answer:

Explanation:

Answer:

It should be B: 0.01 kJ

Answer:

Hey...The answer is B) 0.01 kJ

Explanation:

Acids are substances whose ph is lower than 7.Acids react with most metals to form a salt and hydrogen gas.

Answer:

the difference between pure liquids and crystallines solids is pure liquids have optically active molecules forming twisted shapes whereas solids do not

Explanation:

The statement that best describes the charges of the particles is : ( A ) A neutral particle is striking a positive particle, breaking it into more

The collision of Neutral and postitve particles leads to the production of more negative and positive particles. Due to the neutral force and this leads to the production of an electrical charges.  

Hence a neutral particle striking a positive particle will lead to the production of more positive particle.

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A compound is a special type of molecule where the atoms that form the molecule are of different elements.

Answer:

Hydrogen is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals.

Explanation:

Answer:

Postulates of Dalton's Atomic Theory:

1) Atoms can neither be created nor destroyed.

2) During chemical reaction, atoms combine or separate or re-arrange. They combine in simple ratios.

3) All elements are composed of the indivisible particles called atoms.

4) Atoms of a particular element are identical. They have the same mass and volume.

Postulates of modern atomic theory:

1) All matter is composed of atoms.

2) Atoms consist of protons, electrons and neutrons.

3) Atoms of an element may differ in masses. (as in isotopes)

4) The ratio in which elements combine may not be simple.

Similarities:

1) All elements/matter are/is composed of atoms.

2) Atoms can neither be created nor destroyed.

3) During chemical reactions, atom combine or separate or rearrange.

Differences:

1) Dalton's theory said that atoms are indivisible particles but modern theory denies it and calls atom a divisible particle consisting of sub-atomic particles, protons, electrons and neutrons.

2) Dalton's theory said that atoms of the same element have same mass and volume but according to modern theory, it is said that atoms of the same element can differ in mass (as in isotopes).

3) Dalton said that atoms combine in simple ratio but modern theory denies it.

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

Rutherford concluded that these particles were striking... a tiny region of positive charge. Rutherford called the region that deflected alpha particles... a nucleus. The total volume of the nucleus of an atom is... very small compared with the rest of the atom. Except for in the simplist type fo hydrogen atom, all nuclei consist of...

Explanation:

Answer:

For lithium -6

Proton neutron and electron are

3, 3, 3

For lithium -7

It is 3, 4, 3

Explanation:

Proton is atomic number

Neutron is mass num - atomic num

Electron is the same number with proton

Answer:The halogens in Group 17

Explanation:  The halogens in Group 17 all have 7 valence electrons.  They will steal anuy electrons they can to form a full outer shell.

Answer:

the ribosome catalyzes the formation of which bond peptide bonds, peptidyl transfer, the formation of a peptide bond during protein synthesis

Answer:

This is something you have to do yourself. The teacher is even letting you have a partner. Nobody is going to do this project for you because it´s your responsibility to finish it on your own.

Explanation:

Answer:

15° C

Explanation:

30-15=15

checking* 15+15=30 or 15x2=30