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Chemistry, 03.11.2020 21:50 babyleah2826

Terne, originally an alloy of lead (Pb; r = 154 pm, face-centered cubic) and tin (Sn; r = 140 pm), appears to contain approximately 7 tin atoms for every 16 lead atoms. How can this alloy be characterized?

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Answer from: Quest

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¿qué estás comiendo?   estoy comiendo arroz con pollo.

¿que hay en la mesa?   en la mesa hay muchos platos y un bonito juego de cubiertos.

¿qué haces en el club de la juventud? me junto con mis amigos y jugamos cartas hasta tarde.

¿qué haces en la piscina? en la piscina, nado con mis amigos.

¿estabas dormido? no, estaba leyendo una revista.

¿qué ves en el teatro? en el teatro veo una obra de lope de vega.

a que hora vives hoy. this is illogical because it means what time do you live today? it should be: ¿ a qué hora vienes hoy? hoy vengo a las 4 de la tarde.

¿a qué hora en el verano? en el verano vengo más temprano.

¿qué llevas puesto hoy? hoy llevo puesto un polo y unos pantalones negros.

¿qué te pones cuando vas a la escuela? me pongo un uniforme y zapatos negros.

¿a dónde vas hoy? hoy voy al cine.

¿mañana? en el barco. mañana voy al gimnasio.

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Answer from: Quest

the answer is either b or c

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Answer from: Quest

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

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Answer from: Quest
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Terne, originally an alloy of lead (Pb; r = 154 pm, face-centered cubic) and tin (Sn; r = 140 pm), a...