We are given the balanced equation 2NaF + Ca10(PO4)6(OH)2 → Ca10(PO4)6F2 + 2NaOH. The fluorapatite is the product together with sodium hydroxide. The ions involved are (PO4) 3-, Ca 2+ and <span>F-. We add the charges and check if the sum is zero, 2*10+-3*6+-1*2 =0. the zero sum tells that the compound has zero charge or neutral</span>
Answer:
Climate change leads to a loss of species
With these changes, species have to adapt to new climate patterns (variations in rainfall; longer, warmer summers etc). ... The consequences include habitat loss; shifts in climatic conditions and in habitats that surpass migrational capabilities; altered competitive relationships.
Explanation:
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<h3>1. <u>Answer</u>;</h3>
= 5.4×10-6 g AgBr
<h3><u>Explanation</u>;</h3>
AgBr(s) → Ag+(aq) + Br-(aq) Ksp = 3.3×10^-13
[Ag+][Br-] = Ksp = 3.3×10^-13 = X²
X = 5.7×10^-7 M = [Ag+] = mol/L AgBr that dissolve
1 mole of AgBr = 187.8 g
Therefore;
= 0.05 L × (5.7 × 10^-7 mol/L) × (187.8 g /mol)
= 5.4×10-6 g AgBr
<h3>2. <u>Answer and explanation;</u></h3>
The two factors that accounts for increased rate of chemical reaction when temperature is increased are:
- <u>Energy factor</u>; enough energy in the collision for the formation of an activated complex, where bonds are breaking and new ones forming. When temperature is increased, a greater number of molecular collisions possess enough energy to activate the reaction.
- <u>Frequency of collisions increases;</u> an increase in temperature makes particles move faster and collide more frequently, increasing the possibility of a reaction be-tween them.
More important factor; Energy factor is more important.
Only two on the choice is the answer, and it is O(3) and CO(3)^2-The polyatomic ions and molecules that cannot be adequately described using a single lewis structure is 0(3) and CO(3)^2-
So, The answer in this question is C0(3)^2- and 0(3)
28) All elements are made of atoms
29)Protons and Neutrons
-Electrons make up the outside of the Nucleus
