Answer;
Single replacement reaction
Explanation;
-There are five general types of reactions
. These includes; combination, decomposition, single replacement, double replacement, combustion.
-Single replacement reactions are reactions in which both reactants and products consist of an element and a compound
. For example in our case, for reactants, the element is Aluminium (Al) and the compound is NiBr2, and for products the element is Ni and the compound is AlBr3.
-Single replacement reactions involves a chemical change in which one element replaces a second element in a compound
. In this case Aluminium (Al) replaces nickel (Ni) in the compound NiBr2.
White phosphorus melts and then vaporizes at high temperatures. The gas effuses at a rate that is 0.404 times that of neon in the same apparatus under the same conditions-There are 4 atoms of P in the molecule
Explanation:
Ar=30,97g/mol
/==0,404
0,404=
=20,18/30,97*x
X=20,18/30,97*0,163
X=4
There are 4 atoms of P in the molecule
White phosphorus melts and then vaporizes at high temperatures. The gas effuses at a rate that is 0.404 times that of neon in the same apparatus under the same conditions-There are 4 atoms of P in the molecule
17) 8.4 / 20 x 100
18) 20 . 0.5150
19) 6,50% because (as you said) the law of definite proportions states that regardless of the amount, a compound is always composed of the same elements in the same proportion by mass
Answer:
A ,B- false
C,D- true
Explanation:
Dipole forces always lead to stronger attraction and boiling points than dispersion forces. When linear molecules are involved, they often posses greater dipole forces and higher boiling points. Linear alkanes posses higher boiling points than branched alkanes.
1. 2.408 x 10²⁴ molecules
2. 2.408 x 10²⁴ atoms
3. 4.816 x 10²⁴ atoms
<h3>Further explanation</h3>
Given
4 moles of Carbon dioxide.
Required
Carbon dioxide molecules
Carbon atoms
Oxygen atoms?
Solution
1 moles = 6.02 x 10²³ particles(molecules, atoms, ions)
1. Carbon dioxide molecules :
= 4 moles x 6.02 x 10²³
= 2.408 x 10²⁴ molecules
2. The number of Carbon atoms
In CO₂, there is 1 atom C, so the number of atoms :
= 1 x 2.408 x 10²⁴
= 2.408 x 10²⁴ atoms
3. The number of Oxygen atoms :
In CO₂, there is 2 atom O, so the number of atoms :
= 2 x 2.408 x 10²⁴
= 4.816 x 10²⁴ atoms