Slime flows like a liquid, but unlike familiar liquids (e.g., oil, water), its ability to flow, or viscosity, is not constant. So it's a fluid, but not a regular liquid. Scientists call a material that changes viscosity a non-Newtonian fluid. The technical explanation is that slime is a fluid that changes its ability to resist deformation according to shear or tensile stress.
What this means is, when you pour slime or let it ooze through your fingers, it has a low viscosity and flows like a thick liquid. When you squeeze a non-Newtonian slime, like oobleck, or pound it with your fist, it feels hard, like a wet solid. This is because applying stress squeezes the particles in the slime together, making it hard for them to slide against each other.
Most types of slime are also examples of polymers. Polymers are molecules made by linking together chains of subunits.
The specifics of how a type of slime works depends on its chemical composition, but the basic explanation is that chemicals are mixed to form polymers. The polymers act as a net, with molecules sliding against each other.
Two solutions are combined to make classic slime. One is diluted school glue, or polyvinyl alcohol in water. The other solution is borax (Na2B4O7.10H2O) in water.
Borax dissolves in water into sodium ions, Na+, and tetraborate ions.
The tetraborate ions react with water to produce the OH- ion and boric acid:
B4O72-(aq) + 7 H2O <—> 4 H3BO3(aq) + 2 OH-(aq)
Boric acid reacts with water to form borate ions:
H3BO3(aq) + 2 H2O <— > B(OH)4-(aq) + H3O+(aq)
Hydrogen bonds form between the borate ion and the OH groups of the polyvinyl alcohol molecules from the glue, linking them together to form a new polymer: slime.
Answer:
Option d. 6.95 g
Explanation:
First of all, we state the reaction:
2NaCl + Pb(NO₃)₂ → PbCl₂ + 2NaNO₃
We determine the moles of each reactant, to state the limiting
Firstly we convert volume frm mL to L
0.200 L . 0.250M = 0.05 moles of NaCl
0.200L . 0.250M = 0.05 moles of Pb(NO₃)₂
Acording to stoichiometry we know that relation is 1:2, so the limiting reagent is the NaCl.
For 1 mol of Pb(NO₃)₂ I need 2 moles of NaCl
For 0.05 moles of Pb(NO₃)₂ I would need, the double → 0.1 moles
(We only have, 0.05 moles of NaCl)
Stoichiometry to the formed product is 2:1
From 2 moles of NaCl I produce 1 mol of PbCl₂
From 0.05 moles I would produce, the half → 0.025 moles
Let's convert the moles to mass → 0.025 mol . 278.1 g / 1mol = 6.95 g
<u>Significance</u><u> </u><u>of</u><u> </u><u>dams</u><u> </u><u>and</u><u> </u><u>canals</u><u> </u><u>are</u><u> </u><u>:</u><u>-</u><u> </u>
- Water is stored in dams that are built across rivers. The water is then supplied to nearby towns and cities through pipelines
- Water for agricultural purposes is supplied through a system of irrigation canals
<em>hope</em><em> </em><em>it</em><em> </em><em>helps</em><em> </em><em>~</em>