Asked in Chemistry
Is water added to cement a reversible or an irreversible change?
Portland cement (and the concrete, mortar, thin set, or other masonry product made from it) doesn't dry. Rather, it cures by a chemical reaction initiated by putting water in it. The reaction is irreversible; hence, adding water to cement is an irreversible change. ...
Asked in Electrical Wiring, Firefighters
What is the acceptable method in putting out an electrical fire?
With a dry chemical or CO2 fire extinguisher. Anything not conductive certainly not water. ...
Asked in Chemistry, Science Experiments
Why does water react differently to dry ice then soda?
Water is uncompressed therefore the reaction isn't as big as soda with all the chemical contained. ...
Asked in Science
When you breathe on a window and your air condenses on the window is the liquid that was condensed saliva or water?
basically its water because it has the nearest chemical reaction to it but saliva is the nearest chemical reaction to blood but if you bleed on something and wait for it to dry it condenses more into saliva ...
Asked in Vinegar
Does dry ice react to vinegar?
The choice of preposition is important here. There is no significant chemical reaction between dry ice and vinegar, so if you had said "react WITH" the answer would be no. However, vinegar contains water, and there's the usual (non-chemical) reaction of dry ice to any warm liquid... it begins to sublime. ...
Asked in Fire Extinguishers
What type of extinguisher is appropriate for a fire involving paper?
A paper fire is a Class A fire which can be put out with water, carbon dioxide, or dry chemical fire extinguishers. Paper is very easy to put out but water is the most effective because dry chemical is not useful in putting out sparks. ...
How does the amount of water affect germination rate?
The enzymes in the dry seeds get activated after absorbing water and it unlocks several chemical reaction leading to the germination of seed. ...
Why dry ether used as a catalyst in chemical reactions?
dry ether is generally used as solvent in chemical reactions. to the best of my knowledge there is no reaction where ether is used as a catalyst. ...
Asked in Consumer Electronics, Car Batteries, Genetics
How does an acidic dry cell and an alkaline dry cell differ?
The difference is the acids inside the battery which cause a different chemical reaction. ...
Asked in Chemistry, Elements and Compounds
Is there a chemical reaction between SrCl2 and CoCl2?
dry, certainly not. as aqueous solution, but no evidence would show a double replacement reaction. ...
Asked in Firefighters, Fire Extinguishers
What is the least acceptable method for putting out an electrical fire?
You cannot use water. You could use: halon, CO2, or dry chemical extinguishers to prevent oxygen from reaching the combustible materials. ...
Asked in Physics, Energy, Solar Power, Batteries
In a dry battery cell which form of energy is converted to electrical energy?
The energy is stored in the chemical bonds of molecules and can be released by a chemical reaction. ...
Asked in Chemistry
What to do if a dry chemical is on you?
It depends on the dry chemical. Sodium chloride is a dry chemical that you just have to wipe off. Sodium hydroxide is a dry chemical too, but if you get it on yourself you need to flush your skin with cold running water for 15 minutes then go to the emergency room. The answer to your question is found in the Material Safety Data Sheet for the chemical you are using. ...
Asked in Chemistry
How do heat packs work?
Heat is given off as a result of a chemical reaction. Hot/cold packs are used by athletes to minimize swelling of injuries such as muscle and joint sprains. They are constructed of a large pouch containing a dry chemical plus an inner pouch of water. The hot/cold pack is activated by breaking the seal on the pouch of water and shaking the pack vigorously. This action mixes the water with the chemical starting the exothermic or endothermic reaction. ...