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3 years ago

8

Which of the following lists describes characteristics of a base? (3 points)

1 answer:

mel-nik [20]3 years ago

3 0

Answer:

slippery, high pH, and caustic (last option)

Explanation:

when we say base we should think soap. soap is slippery. Bases give OH- ion. when OH- is combined with H+ ion it will create water which raises the pH. Since base can dissolve fats, ex: using dish liquid to cut grease on pots and pans etc.. they are caustic. Biologically they can disrupt the cell memebrane making it caustic to cell tissue.

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3 years ago

2. What percentage of the mass of 1 mole of C 2 H 5 O is derived from carbon ?

AleksandrR [38]

Answer:

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3 years ago

Read 2 more answers

2.a. 3.26 g of iron powder are added to 80.0 cm3 of 0.200 mol dm-3 copper(II)

Ksenya-84 [330]

Answer:

The limiting reactant is CuSO₄.

Explanation:

The reaction is:

Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s) (1)

To find the limiting reactant we need to find the number of moles of the reactants.

$\eta_{Fe} = \frac{m}{A_{r}}$

Where:

m: is the mass of iron = 3.26 g

$A_{r}$ : is the standard atomic weight of iron = 55.845 g/mol

$\eta_{Fe} = \frac{3.26 g}{55.845 g/mol} = 0.058 moles$

$\eta_{CuSO_{4}} = M*V$

Where:

M: is the concentration of the CuSO₄ = 0.200 mol/dm⁻³

V: is the volume of the solution = 80.0 cm³

First, we need to convert the units of the volume to dm³ knowing that 1 dm = 10 cm and 1 L= 1 dm³.

$V = 80.0 cm^{3}*\frac{1 dm^{3}}{(10 cm)^{3}} = 0.080 dm^{3}$

Now, the number of CuSO₄ moles is:

$\eta_{CuSO_{4}} = M*V = 0.200 mol/dm^{3}*0.080 dm^{3} = 0.016 moles$

So, to determine the limiting reactant we need to use the molar ratio from equation (1), Fe:CuSO₄ = 1:1

$\eta_{Fe} = \frac{1 mol Fe}{1 mol CuSO_{4}}*0.016 moles \: CuSO_{4} = 0.016 moles$

Since we need 0.016 moles of Fe to react with 0.016 moles of CuSO₄ and initially we have 0.058 moles of Fe, then the limiting reactant is CuSO₄.

Therefore, the limiting reactant is CuSO₄.

I hope it helps you!

8 0

2 years ago

How many oxygen atoms are present in 2.50 mol of oxygen molecules

marusya05 [52]

15 X 10 ^23 atoms of O2 .. i guess

4 0

3 years ago