A. Candles produce water. B. Burning always produces water. C. There was water in the container before. D. When a candle burns, a chemical reaction occurs that produces water. 相关知识点: 试题来源: 解析 D。解析:选项 A 蜡烛产生水说法不准确;选项 B 燃烧总是产生水错误;选项 C 容器里之前...
When we mix baking soda and vinegar, a chemical reaction occurs. What gas is usually produced? A. 备计个温领能备计个温领能Oxygen备计个温领能备计个温领能 B. 但积能说点但积能说点Nitrogen但积能说点但积能说点 C. 技活口农想体相工局权正派技活口农想体相工局权正派Carbon dioxide技活口...
When magnesium burns in carbon dioxide (CO₂), a chemical reaction occurs that results in the formation of magnesium oxide (MgO) and carbon (C). Here’s a step-by-step breakdown of the process: Step 1: Understanding the Reactants- Magnesium (Mg) is a highly reactive metal that burns...
Combustion reaction is a chemical reaction that occurs when a substance reacts with oxygen to produce heat and light. Combustion reactions are very important in our daily lives. For example, when we burn wood or coal, a combustion reaction takes place. The conditions for a combustion reaction ...
2. Write the Chemical Formula: - Sodium formate can be represented as HCOONa. - Concentrated sulfuric acid is represented as H₂SO₄. 3. Heating the Mixture: - When sodium formate is heated with concentrated sulfuric acid, a chemical reaction occurs. 4. Products of the Reaction: - Th...
T he bookis about a man and a woman who meet by chance in a park.是答案提示。3.T he womanscribbles down his phone number,是答案提示。4.Jimmy Liao's pictures are often funny andcute. … However, his stories can also be serious. T hey show what it s like to feel lonely inthe ...
Combustion is a chemical process that occurs when a substance reacts with oxygen to produce heat and light. There are three essential conditions for combustion to take place. First, there must be a fuel. Fuels can be solids, liquids, or gases. For example, wood, gasoline, and natural gas...
1. What is a chemical reaction? A. A process where substances stay the same. B. A process that occurs when substances interact and change into new substances. C. A process that only involves one substance. D. A process that doesn't involve any change. 相关...
Combustion is a chemical process that occurs when a substance reacts with oxygen to produce heat and light. There are three essential conditions for combustion to take place. First, there must be a fuel. Fuels can be solid, liquid, or gas. For example, wood, gasoline, and natural gas are...
B. No chemical reaction occurs. C. A new substance is formed. D. The mass of iron decreases. 相关知识点: 试题来源: 解析 C。铁生锈是化学变化,在这个过程中会形成新物质。A 选项颜色会改变,错误;B 选项有化学反应发生,错误;D 选项铁生锈质量会增加,错误。反馈 收藏 ...