Identify indicators of a chemical reaction. Check all of the boxes that apply.

Yanka [14]

Answer:

C

Explanation:

Enantiomers are molecules that are mirror images of one another. This means they have the same connectivity of the same atoms in the molecules but have an opposite 3-dimensional orientation – like the two palms of the hand. This means they polarised light in opposite directions but with equal effect.

6 0

3 years ago

A solution with a ph of 7 must be _____. an acid a base neutral water

steposvetlana [31]

Answer: A solution with a pH of 7 must be neutral.

Explanation:

If a solution has pH of 7 then the concentration of $H^+$ ions and $OH^{-}$ ions will be equal.

Thus, the concentration for both $H^+$ ions and $OH^{-}$ ions will be $1 \times 10^{-7}$ . Generally, pH at 7 is considered as neutral.

Thus, it is concluded that a solution with pH of 7 must be neutral.

6 0

3 years ago

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The lead-containing reactant(s) consumed during recharging of a lead-acid battery is/are ________. The lead-containing reactant(

irga5000 [103]

Answer: The lead-containing reactant(s) consumed during recharging of a lead-acid battery is $PbSO_4(s)$

Explanation:

In lead acid battery, the anode is made up of lead and undergoes oxidation during discharging and cathode is made up of lead oxide and acts as cathode during discharging. The electrolyte used is dilute $H_2SO_4$ .

Charging:

Cathode : reduction : $PbSO_4(s)+2e^{-}\rightarrow Pb+SO_4^{2-}$

Anode: oxidation : $PbSO_4+2H_2O\rightarrow PbO_2+SO_4^{2-}+4H^++2e^-$

Overall reaction : $2PbSO_4+2H_2O\rightarrow Pb+PbO_2+2H_2SO_4$

The lead-containing reactant(s) consumed during recharging of a lead-acid battery is $PbSO_4(s)$

4 0

3 years ago

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__________ ammonium compounds are less effective against gram-negative bacteria and more effective against gram-positive bacteri

Marina86 [1]

Answer:

Quartenary.

Explanation:

Quaternary ammonium compounds (QACs) are cationic salts of organically substituted ammonium compounds and have a broad range of activity against microorganisms, i.e more effective against Gram-positive bacterium at lower concentrations than Gram-negative bacteria.

It was also reported previously that monoalkyl QACs bind by ionic and hydrophobic interactions to microbial membrane surfaces, with the cationic head group facing outwards and the hydrophobic tails inserted into the lipid bilayer, causing the rearrangement of the membrane and the subsequent leakage of intracellular constituents.

6 0

3 years ago

.950 L of .420 M H2SO4 is mixed with .900 L of .260 M KOH. What concentration of sulfuric acid remains after neutralization?

kipiarov [429]

H₂SO₄:

V=0,95L
Cm=0,420mol/L

n = CmV = 0,42mol/L * 0,95L = 0,399mol

KOH:

V=0,9L
Cm=0,26mol/L

n = CmV = 0,26mol/L * 0,9L = 0,234mol

H₂SO₄ + 2KOH ⇒ K₂SO₄ + 2H₂O
1mol : 2mol
0,399mol : 0,234mol
limiting reagent
reamins: 0,399mol - 0,117mol = 0,282mol

n = 0,282mol
V = 0,950L + 0,900L = 1,85L

Cm = n / V = 0,282mol / 1,85L ≈ 0,152M

3 0

3 years ago