Please help this is my chemistry work

Chemistry

2 answers:

Alja [10]3 years ago

5 0

It’s deceleration hope that helps!

Morgarella [4.7K]3 years ago

3 0

It’s it’s deceleration!! I hope it helps :) have a blessed day :)

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1. A student in lab measures 4.6 grams of copper for an experiment. Upon further analysis he determines that he should have meas

Reil [10]

Answer:

$2.13\%$

Explanation:

Quantity of copper measured by a student = 4.6 grams

Original quantity of copper = 4.7 grams

Error in measurement = Original quantity of copper - Quantity of copper measured by a student $=4.7-4.6=0.1$ grams

To find the percent error, apply the following formula:

Percent error = (Error in measurement / Original quantity of copper) × 100

$=\frac{0.1}{4.7}(100)=2.13\%$

4 0

4 years ago

Calculate the amount of heat required for the evaporation of 105.0 g of water at 100.0 c

son4ous [18]

To determine the amount of heat needed to evaporate a certain amount of water at its boiling point, we use the equation,

H = m(Hv)

where H is the heat, m is the mass (in grams), and Hv is the latent heat of vaporization. Substituting the known values,

H = (105 g)(540 cal/g)

H = 56700 cal

H = 56.7 kcal

Answer: 56.7 kcal

8 0

4 years ago

Tris is a weak base. The basic form of tris can be written tris0 and the protonated (conjugate acid) form can be written tris. T

Arada [10]

Answer:

a) [Tris0] : [Tris] = 1 : 100

b) Range = 7.1 to 9.1

Explanation:

a) Calculation of ratio of the basic and the acidic forms of tris

pH of a buffer is calculate using Henderson-Hasselbalch equation

$pH = pKa+log\frac{Salt}{Acid}$