The reactant that is used up first in a reaction.
b.metallic bonding.
c.covalent bonding.
d.hydrogen bonding
Answer: Option (a) is the correct answer.
Explanation:
When there is transfer of electrons between the two atoms then the bond formed is known as ionic bond.
In binary atomic systems, there is formation of ionic bond between a metal and non-metals. As a result, there will be high difference in electronegativity between the two atoms.
Therefore, this also shows potential for electrons transfer.
For example, NaCl is an ionic compound and also there is high difference in electronegativity between the Na and Cl atom.
Thus, we can conclude that ionic bonding is a type of bonding which involves the complete transfer of a valence electron from a less electronegative atom to a more electronegative one.
The answer is: a. ionic bonding.
Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).
For example, compound magnesium chloride (MgCl₂) has ionic bond.
In this example, chlorine is large company, because it has greater electronegativity than magnesium (small company) and take electrons (assets) from it.
Magnesium (Mg) transfers two electrons, became positive cation, to chlorine (Cl), which became negative anion.
Magnesium is metal from group 2 and chlorine is nonmetal from group 17 of the Periodic table.
Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.
The factor label method (dimensional analysis) is a method used to solve problems by the given amount and value. Eightbuses can carry 32,000 basketballs.
Dimensional analysis has been also called the unit factor method used to convert the various units and quantities by mathematical computation and equation formation. It can convert the fundamental and derived units.
Given,
1 bus = 12 cars
3 cars = 1 truck
1 truck = 1000 basketballs
If 3 cars have been equal to 1 truck then, 12 cars will be equal to X trucks
Solving for X as:
X = (12 cars × 1 truck) ÷ 3 cars
= 4 trucks
Hence, 4 trucks are equal to 12 cars.
Now, from above it can be said that 1 bus has been equal to 4 trucks.
So, if one bus = 4000 basketballs
8 bus = X basketballs
Solving for X:
X = 4000 × 8
= 32000 basketballs
Therefore, eight buses can contain 32000 basketballs.
Learn more about dimensional analysis, here:
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Which statement is true about energy in this reaction?
(1) The reaction is exothermic because it releases heat.
(2) The reaction is exothermic because it absorbs heat.
(3) The reaction is endothermic because it releases heat.
(4) The reaction is endothermic because it absorbs heat.
Answer: The answer is (2) the reaction is exothermic because it releases heat.
B. different masses and a different number of molecules
C. equal volumes and the same number of molecules
D. different volumes and a different number of molecules
Answer is C - equal volumes and the same number of molecules.
Explanation;
Let's assume that CO and CO₂ are ideal gases. Then we can use ideal gas law, PV = nRT
Where, P is the pressure of the gas (Pa), V is the volume of the gas (m³), n is the number of moles of gas (mol), R is the universal gas constant ( 8.314 J mol⁻¹ K⁻¹) and T is temperature in Kelvin.
The temperature and the pressure of the both gases are same. Volume is also same as 1.0 L. R is a constant. So according to the formula, both gases have same number of moles. According to the Avogadro's constant, 1 mole has 6.022 x 10²³ particles.
number of molecules = Avogadro's constant x number of moles.
Hence, under the same conditions both gases have same number of molecules.