小苏打和白醋混合为什么会咕嘟咕嘟冒泡?这算真正的燃烧吗?
Why do baking soda and vinegar bubble — is that real burning like fire?
它们发生了酸碱反应:醋酸和小苏打交换搭档,生成醋酸钠、水和二氧化碳气体,泡泡就是被撑出来的二氧化碳。这不是燃烧——燃烧需要氧气参与并放光发热,而这个反应不放火光,甚至还会吸一点热,摸杯子会觉得凉。判断化学反应类型要看有没有新物质生成和能量变化,不能只看冒泡。
They run an acid-base reaction: acetic acid and baking soda swap partners making sodium acetate plus water and carbon dioxide — the bubbles are CO2. It is not combustion: no oxygen-fueled glow, and the mix even turns slightly colder. Reaction types depend on new substances and energy change, not bubbles.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
《十万个为什么》第六版化学分册,少年儿童出版社,2013
Ten Thousand Whys: Chemistry volume, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#酸碱反应 #二氧化碳 #吸热反应
为什么爆米花受热后会「砰」地开花?
Why does popcorn pop with a bang when heated?
每粒玉米里都藏着一点水和软软的淀粉,外面裹着坚硬的盔甲。加热后水变成蒸汽拼命往外顶,盔甲撑不住时就「砰」地炸开,淀粉翻出白白的蓬松花瓣。这就是热胀冷缩的小魔术!
Each kernel hides water and soft starch inside hard armor. Heating turns water to steam pushing hard until the shell bursts pop, flipping fluffy white petals. Heat expansion magic!
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
《十万个为什么》第六版化学分册,少年儿童出版社,2013
Ten Thousand Whys: Chemistry volume, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#爆米花 #加热 #膨胀
打开汽水瓶时,为什么会「呲」地冒出好多气泡?
Why does a soda bottle hiss and fizz when opened?
工厂灌装时把二氧化碳气体加压溶进了水里,像把很多气泡塞进隐形气球。拧开瓶盖,压力一下子释放,隐形气球集体爆开,气泡争先恐后往外跑。所以汽水要轻拿轻放,摇过的瓶子会喷你一身!
The factory dissolves carbon dioxide into water under pressure, stuffing bubbles into invisible balloons. Twist the cap, pressure escapes, and every balloon pops at once as bubbles race out. Handle bottles gently — shaken ones spray you!
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
《十万个为什么》第六版化学分册,少年儿童出版社,2013
Ten Thousand Whys: Chemistry volume, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#二氧化碳 #溶解 #气压