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nevsk [136]
2 years ago
10

2.A solid block with a length of 6.0 cm, a width of 3.0 cm, and a height of 3.0 cm has a mass of 146 g. What is the block’s dens

ity? Show all work.
3.To determine the density of an irregularly shaped object, a student immersed the object in 21.2 mL of water in a graduated cylinder causing the level of the water to rise to 27.8 mL. If the object has a mass of 22.4 grams, what is the density of the object?
Chemistry
2 answers:
serg [7]2 years ago
4 0

1) Answer is: density of block is 2.70 g/cm³.

V(block) = 6.0 cm · 3.0 cm  3.0 cm.

V(block) = 54 cm³; volume of solid block.

m(block) = 146 g; mass of solid block.

d(block) = m(block) ÷ V(block).

d(block) = 146 g ÷ 54 cm³.

d(block) = 2.70 g/cm³ = 2.70 g/mL.

2) V(object) = 27.8 mL - 21.2 mL.

V(object) = 6.6 mL; volume of the object.

d(object) =22.4 g ÷ 6.6 mL.

d(object) = 3.39 g/mL.

posledela2 years ago
3 0
2: <span>Volume V = a*b*c = 6.0*3.0*3.0 = 54.0 cm^3                                                   density ρ = mass/volume = 146/54 = 2.70 g/cm^3
3: Volume = (27.8 -21.2) cm^3
mass = 22.4 g
density = 22.4/(27.8-21.2) g/cm^3

</span>
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Answer: 1.14

Explanation:

HCl+NaOH\rightarrow NaCl+H_2O

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n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid which is HCl

are the n-factor, molarity and volume of base which is NaOH.

We are given:

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Putting values in above equation, we get:

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2 years ago
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Enzymatic kinetics studies the speed of enzyme catalyzed reactions. These studies provide direct information about the mechanism of the catalytic reaction and the specificity of the enzyme. The speed of a reaction catalyzed by an enzyme can be measured with relative ease, since in many cases it is not necessary to purify or isolate the enzyme. The measurement is always carried out under the optimal conditions of pH, temperature, presence of cofactors, etc., and saturating substrate concentrations are used. Under these conditions, the reaction rate observed is the maximum speed (Vmax). The speed can be determined either by measuring the appearance of the products or the disappearance of the reagents.

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2 years ago
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Vladimir [108]

Answer:

A titration

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By definition, a titration is a quantitative analysis, as we determine how much of an analyte is there in a sample. However, <u>there are quantitative analyzes which are not titrations</u>. This is why the most appropiate answer is<em> a titration</em>.

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