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Vapor is released and the material in the beaker changes from white to black what must you know to determine if a chemical change occurred?
Wiki User
∙ 16y ago
Are you asking: why does the sugar turn clear from white? Because the first time it was heated the water was evaporated leaving the sugar behind, The sugar contained air which made it look white, The second time it was heated the sugar melted and released the air this made the sugar not reflect light anymore and gave it A 'more clear' appearance. This is A guess based on my experience with cooking with sugar and also painting cars. When you sand clearcoat on A car it looks white but if you put water on it (which fills the scratches and smoothes it out) it looks clear again.
Wiki User
∙ 16y ago
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The formula Q equals mHf is used to determine the amount of heat absorbed or released by a material at its melting point. What does m and Hf stand for?
The m stands for mass and Hf stands for heat of fusion.
Gasoline is an example of energy released by blank changes?
The coubustion of gasoline is an example of energy released by chemical changes
Substances are changed into different substances when bonds break and form during?
Chemical bonds are made and broken by chemical reactions. After chemical bonds have been broken, then energy is released, and if a chemical bond is made, then energy is absorbed.
Is it true Elastic deformation occurs when a material deforms as stress is applied?
Up to a point, it is possible to elastically deform any material. If the force is released, the material relaxes back to its original shape. If a material is deformed too much, the deformation becomes permanent (plastic deformation) or fracture will occur in a non-ductile material such as glass.
Which forms of energy is released when wood is burned?
Chemical potential energy is released as heat, light, and sound when wood is burnt.
In a beaker sugar is dissolved in water and then the water is heated and evaporates The sugar is recovered and heat is again applied Vapor is released and the material in the beaker changes from?
In a beaker, sugar is dissolved in water, and then the water is heated and evaporates. The sugar is recovered, and heat is again applied. Vapor is released, and the material in the beaker changes from white to black. What must you know to determine if a chemical change occurred? CO2 (carbon dioxide) CuO (oxidized copper) H2O (distilled water) H2O2 (hydrogen peroxide) NaCl (sodium chloride)
How would you determine if a chemical change has occurred?
There are a few ways... 1) the identity of the substance changed 2) there was a gas released (fizzing, bubbles, etc.) 3) color change (even though color change is a physical property, it might be caused by a chemical reaction)
What is the only sure way to prove that a chemical reaction has occurred?
Signs of chemical reactions may be: - Gas was formed - Formation of a precipitate and water - Reactants disappeared - products were made - energy is released - properties of reactant and products are different
What is a change in matter in which new or different kinds of matter are formed?
When one or more new substances is created, the change is called a chemical change. A chemical change has occurred if there is a new substance created, there was energy released or absorbed, or the substances no longer exhibit the same chemical properties.
How is the energy of gasoline released?
chemical reactionGasoline does not get energy from the Sun. It is derived from crude oil, which was created millions of years ago by decomposition of organic material.
Which type of energy is released in chemical?
Chemical energy is released during a chemical reaction.
What is the gap called into which the chemical is released?
A synaptic cleft is the gap into which a chemical is released.
What gap is called into which the chemical is released?
A synaptic cleft is the gap into which a chemical is released.
What is the chemical released when someone is lying?
The chemical released during lying is catecholamines
What type of energy is released when fossil fuels are burned?
it released chemical energy
What chemical is released when chemical bonds of glucose are broken?
ATP
Is chemical energy a source of electricity?
no, chemical energy is the energy released from chemical reactions
