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4 years ago

How to tell if its an over or under prediction calculus?

1 answer:

4 0

<span>So left handed approximation underestimates the area under a increasing curve and over estimates for decreasing curves. And right handed approximation overestimates for increasing curves and underestimates for decreasing curves.</span>

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How do atoms combine to make a different types of matter

Yuliya22 [10]

Answer: Atoms of different elements can combine to make new substances or different types of matter.

Explanation:

A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements

For example: To form water, some atoms fuse together and form molecules. (H2O).

7 0

3 years ago

Geologists use the decay of potassium-40 in volcanic rocks to determine their age. Potassium-40 has a half-life of 1.26 109 year

melomori [17]

Answer:

$m_{o} \approx 3.247\times 10^{-7}\,g$

Explanation:

The mass of radioactive isotope at a certain time is given by the following expression:

$m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }$

Time constant can be calculed in terms of half-life:

$\tau = \frac{t_{1/2}}{\ln 2}$

$\tau = \frac{1.26\times 10^{9}\,yr}{\ln 2}$

$\tau = 1.818\times 10^{9}\,yr$

The initial mass is:

$m_{o} = \frac{2.73\times 10^{-7}\,g}{e^{-\frac{3.15\times 10^{8}\,yr}{1.818\times 10^{9}\,yr} }}$

$m_{o} \approx 3.247\times 10^{-7}\,g$

8 0

3 years ago

Using the following thermochemical data, what is the change in enthalpy for the following reaction?

slavikrds [6]

Answer:

D. -120.9 kJ

Explanation:

According to Hess's law ,the total enthalpy change for a reaction is the sum of all changes regardless of the stages or the steps of the reaction.

$CaO + 2HCl \rightarrow CaCl_{2} + H_{2}O\ (\Delta H = -186\ kJ)$ ....(1)

$CaO + H_{2}O\rightarrow Ca(OH)_{2}\ (\Delta H = - 65 \ kJ)$

(this reaction should be reversed in order to reach the required reaction )

On reversing the reaction the sign of $\Delta H$ get reversed.

(In this case change sign from '-' to'+'. Hence $\Delta H$ = + 65 kJ)

$CaO + 2HCl \rightarrow CaCl_{2} + H_{2}O\ (\Delta H = - 186\ kJ)$ ....(1)

$Ca(OH)_{2} \rightarrow CaO + H_{2}O\ (\Delta H = + 65 kJ )$ ......(2)

Adding equation (1) and (2)

$Ca(OH)_{2} + 2HCl \rightarrow CaCl_{2} + 2H_{2}O[tex][tex]Delta H = - 186 + 65 = - 121\kJ$

$Delta H = - 121\kJ$ (It is nearly equal to -120.9 kJ)

7 0

3 years ago

What do we need to know about a molecule in order to carry out molarity calculations

professor190 [17]

Answer the type of cell

Explanation:

7 0

3 years ago

What's in diapers????

ANEK [815]

Cotton a thin membrane like skin dye and a liquid that helps absorb things

8 0

3 years ago