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arsen [322]
3 years ago
15

An element is matter that is composed of one type of (atom/quark). 8. the unit of measurement used for atomic particles is the (

atom size/atomic mass unit). 9. atoms of the same element that have different numbers of neutrons are called (isotopes/electron clouds). 10. in the periodic table, elements are arranged by increasing atomic (power/number).
Chemistry
1 answer:
9966 [12]3 years ago
6 0
<span>Q!)
An element is matter that is composed of one type of atom.
Atoms make up elements. If its made of one type of atom, its called an element.
eg: Na is an element and made up of Na atoms only. If its a compound its made of different types of atoms, e.g.: H</span>₂O is a compound made of H atoms and O atoms.<span>
 
Q2)</span><span> the unit of measurement used for atomic particles is the atomic mass unit.
this is the unit used to measure size of an atom. One atomic mass unit is roughly equivalent to the mass of a nucleon, nucleons could be either protons or neutrons as they both have the same mass. Atomic mass unit can also be defined as 1/12th the mass of a 12-C atom.


Q3)
 atoms of the same element that have different numbers of neutrons are called isotopes.
isotopes are when when atoms have the same number of protons and electrons but different numbers of neutrons. Since these atoms have the same number of protons they are of the same element, but neutron number changes therefore atomic mass changes too.

Q4)</span><span> in the periodic table, elements are arranged by increasing atomic number.
the atomic number is characteristic of the element. atomic number is the number of protons the atoms has. While the number of electrons and neutrons may vary within atoms of the same element, the protons usually dont change. Therefore its characteristic for the element. Periodic table, elements are arranged in order of increasing atomic number, by doing so elements with similar characteristics fall into the same column/ groups.</span>
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When a molecule of nad+ gains a hydrogen atom, the molecule becomes reduced.
Ilia_Sergeevich [38]
The answer is true.the molecule becomes reduced.
5 0
3 years ago
What is the importance of knowing capacity, appreciation and experimental error in measuring instruments?
Tanzania [10]

Answer:

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Explanation:hope it helps

8 0
2 years ago
If 5 grams of co and 5 grams of o2 are combined according to the reaction 2co o2 --&gt; 2co2, which is the limiting reagent?
IrinaK [193]

When 5 grams of CO and 5grams of O₂ is combined according to the reaction 2CO + O₂ ----------> 2CO₂ then Limiting reagent is CO.

Limiting reagent is the reactant that get used up in the reaction first.

According to the given reaction:

2CO + O₂ ----------> 2CO₂

5g       5g

∴ Molar mass of CO = Molar mass of C + Molar mass of O

⇒ Molar mass of CO = 14 + 16

⇒ Molar mass of CO = 28g

∴ Molar mass of O₂ = 16(2) = 32g

∴ Molar mass of CO₂ = Molar mass of C + 2(Molar mass of O)

⇒ Molar mass of CO₂ = 14 + 2(16)

⇒Molar mass of CO₂ =44g

Let's find out the moles of CO and O₂

∴ Moles = Given mass / Molar mass

⇒ moles of CO = 5/28 = 0.17

⇒ moles of O₂ = 5/32 = 0.15

For finding out the Limiting Reagent, we will divide the number of moles with the stiochiometry of the given reaction.

⇒ For CO = Moles/ stiochiometry = 0.17/2 = 0.085

⇒ For O₂ = Moles/ stiochiometry = 0.15/1 = 0.15

Since, the ratio of number of moles with the stiochiometry is less for CO hence it is the Limiting reagent, i.e. it will get used up in the reaction first.

Hence, the Limiting reagent  for the reaction is CO.

Learn more about Limiting reagent here, brainly.com/question/11848702

#SPJ4

8 0
8 months ago
trace amounts of copper are required for good healt.but high concentrations of copper can be toxic.under what conditions might t
Andru [333]
For example, at atmospheric corrosion of copper:
2Cu + CO₂ + O₂ + H₂O = CuCO₃*Cu(OH)₂

and disolution of substances of copper in an acid condition:
CuCO₃*Cu(OH)₂(s) + 4HNO₃(aq) = 2Cu(NO₃)₂(aq) + CO₂(g) + 3H₂O(l)
CuCO₃*Cu(OH)₂(s) + 4H⁺ = 2Cu²⁺ + CO₂ + 3H₂O
3 0
3 years ago
Which part of an amino acid is always acidic?
Alenkasestr [34]
The carboxyl group in the amino acid is always acidic
8 0
2 years ago
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