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xxTIMURxx [149]
3 years ago
7

Oblicz masę tlenu, wiedząc, że wypełnia on pomieszczenie o rozmiarach 2m x 3.5m x 3m. Gęstość tlenu wynosi 1,249kg/m3 .

Chemistry
1 answer:
Tanzania [10]3 years ago
8 0

Analiza Z drugiej zasady Newtona przyłożona siła wynosi 1 N F = ma = m (6 g) = (90 kg) (6x9,81 m / s) 5297 N I kg m / s?

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For the simple decomposition reaction
Stella [2.4K]

Answer: 7s

Explanation:

The order of the reaction is 2.

Integrated rate law for second order kinetic is determined using the formula

1/[At]=1/[Ao] +kt

But, [Ao] is the initial concentration  = 1.50 mol/L

And [At] is the final concentration  = 1/3 of initial concentration =1/3×1.5 = 0.5 mol/L

Rate constant, k = 0.2 L/mol*s

Using the formula

1/0.5=1/1.5+0.2t

Collecting like terms

1/0.5-1/1.5=0.2t

LCM = 1.5

3-1/1.5=0.2t

2/1.5=0.2t

Multiply both sides by 1/0.2

2/1.5×0.2=t

2/0.3=t

t=6.66s

t=7s

4 0
4 years ago
Which element is classified as an alkali metal?
Delvig [45]

Answer: The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K),[note 1] rubidium (Rb), caesium (Cs),[note 2] and francium (Fr).

Explanation:

8 0
4 years ago
Match the layers of the atmosphere
Ira Lisetskai [31]

Answer:

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7 0
3 years ago
Reasons for taking the melting point of a solid sample
Rudik [331]

Definition of melting point:

The melting point of solid is defined as the temperature at which the solid exists in equilibrium with its liquid under an external pressure of one atmosphere.

Reason:

The melting point is an important physical property of a compound.

1) The melting point can be used to identify a substance.

2) As an indication of its purity.

5 0
4 years ago
) Predict the product for the following reaction sequence. A) 2,2-dimethylpropanoic acid B) 3,3-dimethyl-2-butanone C) 2,2-dimet
cestrela7 [59]

Answer:

Option C. 2,2-dimethyl-1-propanol

Explanation:

The first attached picture, is the initial reactant.

Now, what happens in each step?, at first we have an alkyl bromide reacting with Mg/ether. This converts the reactant in a grignard reagent, which is often used in several ketones/ladehydes reactions, and even some acid and esthers.

Now, in the second step, we see this grignard reagent, reacting with CO₂ and H₃O⁺. At first, the grignard reagent will attach to the oxygen of the CO₂ by the MgBr, and the carbonated chain will attach to the carbonile. Then in acid medium, the OMGBr leaves the molecule, and form a carboxylic acid.

Finally, in the last step with LiAlH₄ and water, this compound just reduces the carboxylic acid to a primary alcohol, therefore, the only choice available is option c, 2,2-dimethyl-1-propanol.

See picture 2 below for the drawing.

Hope this helps

8 0
3 years ago
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