Answer:
a. single replacement reaction
Explanation:
Mg(s) + 2HCl(aq)——-> H2(g) + MgCl2(aq)
Mg replaces H, so this is a single replacement reaction.
Answer:
pH = 11.60
Explanation:
When we add a base, we are increasing [OH⁻], so the pH will be totally basic.
pH of water = 7
Basic pH > 7
We are adding 2 M . 1 mL = 2 mmoles
2 mmoles of OH⁻ are contained in 501 mL of total volume.
[OH⁻] = 2 mmol / 501 mL = 3.99×10⁻³ M
- log 3.99×10⁻³ M = 2.39 → pOH
pH = 14 - pOH → 11.61
Water equilibrium
2H₂O ⇄ H₃O⁺ + OH⁻ Kw = 1×10⁻¹⁴
NaOH → Na⁺ + OH⁻
Answer:
From my side I think it is Photoreceptors cells :
A photoreceptor cell is a specialized type of neuroepithelial cell found in the retina that is capable of visual phototransduction. The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes. To be more specific, photoreceptor proteins in the cell absorb photons, triggering a change in the cell's membrane potential.
There are currently three known types of photoreceptor cells in mammalian eyes: rods, cones, and photosensitive retinal ganglion cells. The two classic photoreceptor cells are rods and cones, each contributing information used by the visual system to form a representation of the visual world, sight. The rods are narrower than the cones and distributed differently across the retina, but the chemical process in each that supports phototransduction is similar. A third class of mammalian photoreceptor cell was discovered during the 1990s: the photosensitive ganglion cells. These cells do not contribute to sight directly, but are thought to support circadian rhythms and pupillary reflex.
Explanation:
B) gets smaller
The concentration of hydrogen atoms is inversley related to its pH.
The molality of the isopropyl alcohol in the solution is 13.95 m
<h3>Assumption</h3>
- Let the mass of the solution be 100 g.
- 45.6% by mass isopropyl alcohol = 45.6 g
- Mass of solvent = 100 – 45.6 = 54.4 g
<h3>Determination of the mole </h3>
- Mass of isopropyl alcohol = 45.6 g
- Molar mass of isopropyl alcohol = 60.11 g/mol
- Mole of isopropyl alcohol =?
Mole = mass / molar mass
Mole of isopropyl alcohol = 45.6 / 60.11
Mole of isopropyl alcohol = 0.759 mole
<h3>How to determine molality </h3>
- Mole of isopropyl alcohol = 0.759 mole
- Mass of solvent = 54.4 g = 54.4 / 1000 = 0.0544 Kg
Molality = mole / mass of solvent
Molality = 0.759 / 0.0544
Molality = 13.95 m
Learn more about Molality:
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