the images below show two commonly observed changes.
which statement correctly describes one of the changes?
a) picture i shows a chemical change, because a new substance is formed.
b) picture ii shows a chemical change, because a new substance is formed.
c) picture i shows a chemical change, because the same substance changes form.
d) picture ii shows a chemical change, because the same substance changes form.
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Ответ:
"Picture I shows a chemical change, because a new substance is formed."
Note: "Picture II" is a "physical change" because it is a "phase change"—no "new substance" is form; rather, the same substance changes form.
Ответ:
Existen magnitudes básicas y derivadas, que constituyen ejemplos de magnitudes físicas: la masa, la longitud, el tiempo, la carga eléctrica, la densidad, la temperatura, la velocidad, la aceleración y la energía. En términos generales, es toda propiedad de los cuerpos o sistemas que puede ser medida. De lo dicho se desprende la importancia fundamental.
Explanation:
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