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3 years ago

The atomic number of an element best corresponds to which of the following?

Chemistry

1 answer:

xenn [34]3 years ago

7 0

Answer: The number of protons in the nucleus of an atom of that element.

Explanation: the atomic number of an element is simply the proton number of that element. This is the most reason while the ion of a particular element still retain its atomic number whether it gains or loss electrons. For example, sodium atom (Na) has 11 electrons, 11 protons and 12 neutrons. Sodium ion (Na+) on the other hand has 10 electrons because it loss one electron, 11 proton and 12 neutrons. If the atomic number was to be determined by the number of electrons, then the atomic number of sodium atom and sodium ion would have been different. So the best way to determine the atomic number is by the number of protons. Neutron number will only bring about isotope and not atomic number

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Explain in a short sentence how you can tell a reaction is a decomposition reaction.

mr Goodwill [35]

Answer: A decomposition reaction occurs when one reactant breaks down into two or more products.

Mark me as brainilist pls

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2 years ago

Which atoms make up a molecule of sodium bicarbonate.

Ratling [72]

Answer:

Its chemical formula is NaHCO3. Its formula consists of one sodium (Na) atom, one hydrogen (H) atom, one carbon (C) atom and three oxygen (O) atoms.

Explanation:

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8 0

1 year ago

Sodium reacts with chlorine gas according to the following reaction: 2Na(s)+Cl2(g)→2NaCl(s) What volume of Cl2 gas, measured at

asambeis [7]

Answer:6.719Litres of Cl2 gas.

Explanation:According to eqn of rxn

2Na +Cl2=2NaCl

P=689torr=689/760=0.91atm

T=39°C+273=312K

according to stoichiometry of the reaction,1Moles of Cl2 gives 2moles of NaCl

But 28g of NaCl was given,we have to convert this to moles by using the relation, n=mass/MW

MW of NaCl=23+35.5=58.5g/mol

n=28g(mass given of NaCl)/58.5

n=0.479moles of NaCl

Going back to the reaction,

if 1moles of Cl2 produces 2moles of NaCl

x moles of Cl2 will give 0.479moles of NaCl.

x=0.479*1/2

x=0.239moles of Cl2.

To find the volume, we use ideal ggas eqn,PV=nRT

V=nRT/P

V=0.239*0.082*312/0.91

V=6.719Litres

6 0

2 years ago

Which process of the water cycle occur by releasing energy?

pshichka [43]

Condensation occurs through the release of energy

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3 years ago

The basic building blocks of a protein are

snow_lady [41]

The building blocks of protein are amino acids.

Amino acids are a class of organic compounds that contain at least one amino group, -NH2, and carboxyl group, -COOH.

Alpha amino acids , RCH(NH2)COOH, are the building blocks from which proteins are constructed.

The NH group of one amino acid and the COOH group of the other amino acid are joined together and a peptide bond -CONH- is formed between the two amino acids and the product is called a dipeptide.

5 0

2 years ago