SUPER

Science

7th

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Chemical Reactions

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23 questions

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  • 1. Multiple Choice
    45 seconds
    1 pt

    Harrison is making cake. He prepares some batter and places it into the oven. Harrison realizes a gas, carbon dioxide, is coming out of the batter as it bakes.


    Harrison está haciendo pastel. Prepara un batido y lo mete en el horno. Harrison se da cuenta de que sale gas, dióxido de carbono, de la masa mientras se hornea.


    Which options are true about carbon dioxide?

    ¿Qué opciones son ciertas sobre el dióxido de carbono?

    It is a new gas that forms during baking.

    It is made of atoms that did not exist before.

    It is the dough changing states from solid to gas.

    It is formed from the atoms of the batter

  • 2. Multiple Choice
    30 seconds
    1 pt

    The element sodium (Na) is a soft solid that will react explosively with water. The element chlorine (Cl) is a toxic gas. When these two elements combine, they produce a stable, crystalline solid known commonly as table salt (NaCl).


    How would you explain this?


    El elemento sodio (Na) es un sólido blando que reacciona explosivamente con el agua. El elemento cloro (Cl) es un gas tóxico. Cuando estos dos elementos se combinan, producen un sólido cristalino estable conocido comúnmente como sal de mesa (NaCl). ¿Cómo explicarías esto?

    When substances combine to form new substances, the properties of the reactants are preserved.

    The properties of each of the two original elements are combined to give salt its properties.

    Sodium and chlorine become different elements during the reaction.

    When substances combine to form new substances, the properties of the resulting substances will be different.

  • 3. Multiple Choice
    30 seconds
    1 pt

    Consider burning a hot cheeto. This is a chemical reaction. The hot cheeto, flame, and oxygen in the air enter a chemical reaction and produce ash and some other things.


    Considere quemar un cheeto caliente. Ésta es una reacción química. El cheeto caliente, la llama y el oxígeno del aire entran en una reacción química y producen cenizas y algunas otras cosas.


    Which statement would be true?

    Ash is a different substance than the hot cheeto.

    The atoms of wood and oxygen disappear during the burning.

    Ash has similar properties to oxygen.

    The atoms of the ash did not exist before.

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