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ololo11 [35]
3 years ago
7

A) melissa planted more seeds than juan.

Chemistry
2 answers:
melomori [17]3 years ago
8 0
B.......................
kolbaska11 [484]3 years ago
3 0
C the two students watered the seeds differently
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Which of the following statements is not true for an exothermic reaction? Question options: The products have a higher heat cont
dsp73

Answer:

The products have a higher heat content than the reactants.

Explanation:

The statement above is not true for an exothermic reaction because in an exothermic reaction heat is released to the surroundings. This simply means that the total energy of the products is less than that of the reactants.

5 0
3 years ago
It is known that the kinetics of recrystallization for some alloy obey the Avrami equation andthat the value of n in the exponen
Paul [167]

Answer:

rate of recrystallization = 4.99 × 10⁻³ min⁻¹

Explanation:

For Avrami equation:

y = 1-e ^{(-kt^n)} \\ \\ e^{(-kt^n)} = 1-y\\ \\ -kt^n = In(1-y) \\ \\ k = \dfrac{-In(1-y)}{t^n}

To calculate the value of k which is a dependent variable for the above equation ; we have:

k = \dfrac{-In(1-0.40)}{200^{2.5}}

k = 9.030 \times 10 ^{-7}

The time needed for 50% transformation can be determined as follows:

y = 1-e ^{(-kt^n)} \\ \\ e^{(-kt^n)} = 1-y\\ \\ -kt^n = In(1-y) \\ \\ t =[ \dfrac{-In(1-y)}{k}]^{^{1/n}}

t_{0.5} =[ \dfrac{-In(1-0.4)}{9.030 \times 10^{-7}}]^{^{1/2.5}}

= 200.00183 min

The rate of reaction for Avrami equation is:

rate = \dfrac{1}{t_{0.5}}

rate = \dfrac{1}{200.00183}

rate = 0.00499 / min

rate of recrystallization = 4.99 × 10⁻³ min⁻¹

8 0
3 years ago
Do x-rays travel slower than infrared
OleMash [197]
No, x-rays do not travel slower than infrared radiation or even the opposite. Both are travelling in vacuum therefore they travel at same speed. They differ in the frequency of the electromagnetic waves.
3 0
3 years ago
Which reaction type is the following: AgF + CaCl2 --> AgCl + CaF2
nevsk [136]

Explanation:

{\small{\underline{\bf{\red{answer...}}}}} \\  \\

\small\mathfrak\purple{Double  \: displacement \:  reaction} \\  \\ \small\mathfrak\orange{hope \: it \: helps...}

6 0
2 years ago
A sample of metal has a mass of 18.20g, and a volume of 7.38mL. What is the density in g/cm^3?
AlexFokin [52]
Density = Mass ÷ Volume. You get 2.466
8 0
3 years ago
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