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rusak2 [61]
3 years ago
5

3. Which is the minimum amount of energy required to start a chemical reaction?

Chemistry
2 answers:
jekas [21]3 years ago
3 0
B. Chemical energy to start a chemical reaction
Vedmedyk [2.9K]3 years ago
3 0
C. activation energy is the minimum amount of energy required to start a chemical reaction. all chemical reactions need a certain amount of activation energy to get started.
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Francine makes several measurements of the mass of a metal block. The data set is shown in the table below. Measurement Mass of
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The characteristic being calculated here is the mean or the average of the data set.
To check:
(20.73 + 20.76 + 20.68 + 20.75)/4 [we divide it by 4 because there are 4 numbers]
= 82.92 / 4
= 20.73
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3 years ago
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Cuál es la importancia de una fórmula química y explique las clases de fórmulas con sus ejemplos respectivos.
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Answer and Explanation:

Las fórmulas químicas sirven para conocer qué elementos químicos y en qué cantidad están presentes en un compuesto químico. Por ejemplo: la fórmula química del dióxido de carbono es CO₂. Esta fórmula nos indica que la molécula de dióxido de carbono está formada por 1 átomo del elemento químico carbono y 2 átomos del elemento oxígeno.

Los diferentes tipos de fórmulas químicas son: fórmula empírica, fórmula molecular, fórmula semi-desarrollada y fórmula desarrollada. Tomando como ejemplo al compuesto <em>butano</em>:

- Fórmula empírica: C₂H₅ (indica que hay 2 átomos de C por cada 5 átomos de H; es una fórmula mínima)

- Fórmula molecular: C₄H₁₀ (indica que en realidad cada molécula de butano tiene 4 átomos de C y 10 átomos de H).

- Fórmula semi-desarrollada: CH₃CH₂CH₂CH₃ (indica el órden en que se unen los átomos en la molécula).

-Fórmula desarrollada: ver dibujo adjunto (indica cómo están unidos los átomos dentro de la molécula. Ahora vemos los enlaces entre los átomos y que los 2 átomos de C de los extremos están unidos a 3 átomos de H y a otro C, y los dos átomos de C del medio están unidos cada uno a 2 C y 2 H).

8 0
3 years ago
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A likely application of a radioactive isotope with a short half-life such as Technetium-99 will be as a medical tracer. It will likely be used by a doctor to check the movement of substances within a person's body.

A radioactive isotope with such a long half-life like Rubidium-87 is likely used in the determination of the age of fossils and artifacts found by archaeologists.<span />
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4 years ago
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Study the diagram about the varying pressures of Earth’s Layers.
melomori [17]

Answer:

A) Outer core

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This would be 8.010 * 10^-2
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