Jennifer and Cody are mixing substances during a lab experiment. They observe the four effects listed below. Which of these effects indicate

Question

Jennifer and Cody are mixing substances during a lab experiment. They observe the four effects listed below. Which of these effects indicates that a chemical reaction has taken place between two substances?

A pink powdered substance turns water pink when they are mixed together.

A piece of shiny metal begins to bubble when placed in a clear liquid.

A white solid disappears when mixed with water.

A clear, lemon-scented liquid continues to smell like lemon when it is mixed with water.

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Yến Oanh 4 years 2021-09-04T23:13:31+00:00 1 Answers 1 views 0

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    2021-09-04T23:15:18+00:00

    Answer:

    number 2

    Explanation:

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )