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When a small piece of potassium is dropped into a beaker of water the potassium moves about rapidly and then ignites within secounds the metal is gone and all activity ceases Is that chemical change?
Wiki User
∙ 13y ago
Yes, according to wikipedia:
Potassium reacts very violently with water producing potassium hydroxide (KOH) and hydrogen gas.2 K (s) + 2 H2O (l) → 2 KOH (aq) + H2 (g)
This is a chemical change.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoYes.
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When potassium is dropped into aqueous zinc nitrate zinc and aqueous potassium nitrate form.?
Potassium form in water potassium hydroxide; so the reaction will be:2 KOH + Zn(NO3)2 = 2 KNO3 + Zn(OH)2(s)
When Sodium ignites when dropped in water is it either a physical property or a chemical property?
i am asking the same quesion it is on my chemistry homework and i dont know the answer!!
What will happen if small piece of crystall of potassium permaganate is dropped in a beaker filled with water and is heated?
The water turns purple, and gets hotter. And what happens to the beaker? Depending on what it is made of, and the temperature to which it is heated, it might melt.
Can silver potassium cyanide kill you?
Let's clear one thing up first: potassium cyanide is a solid (powder). At room temperature, in its pure form, it can't be drunk.Of course, one can take a tablespoon of potassium cyanide and dissolve it in a glass of water, THEN drink the resulting solution. The result would be a quick DEATH, because there is more than a fatal dose of cyanide in one tablespoon of the compound.The gas chamber, which was used as an execution method by some US states until quite recently, makes use of potassium cyanide. Pellets or powdered potassium cyanide are dropped into a dish filled with sulfuric acid, which is placed underneath the chair of the condemned prisoner. The potassium cyanide quickly reacts with the acid, and releases hydrogen cyanide, which is the gas that poisons and kills the prisoner.Potassium cyanide is a common and useful laboratory chemical, despite its toxicity. As with all laboratory chemicals, it should be used with care and respect.
What is the chemical equation for a flame test or more specifically the chemical equation for the flame test of calcium chloride?
The flame colour should be LILAC. When holding the potassium chloride above it, make sure nothing has dropped into the flame/Bunsen Burner before as that will definitely affect the results (i.e. change the flame colour completely!). It can turn out to be pink or white, but it should be lilac, so don't worry.How to do:1) Select a splint or tweezers/safe holder and soak in compound.2) Gently pass the splint through the hot flame of a Bunsen Burner. Do not hold the splint in the flame for too long, as it could affect the results.3) Return the splint and wash thoroughly before reusing for different compound or experiment. Wash hands if any substance causes irritation or harm. Do not rub eyes as all chlorides are irritant, corrosive, toxic or harmful.
When a small piece of potassium metal is dropped into a breaker of water the potassium moves about rapidly and then ignites within seconds the metal is gone and all activity ceases this is and example?
It is an example of a chemical reaction
A rock is dropped from a height of 80 m and is free fall what is the velocity of the rock as it reaches the ground 4.0 secounds later?
39 m\s downward
What happens to the ions when potassium permanganate are dropped into water?
When potassium permanganate is dropped into water, the ions are solvated by the water molecules. This results because potassium permanganate is water soluble. Thus, the solid compound is separated into aqueous ions.
What is the chemical formula of the salt produced by the neutralization of potassium hydroxide with nitric acid?
Potassium Nitrate+Water HNO3 (aq)+KOH (aq)-->KNO3 (aq)+H2O (l)
If a piece of potassium metal is dropped in water then a vigorous reaction takes place with the formation of potassium hydroxide and hydrogen gas is evolved?
Yes, it is correct.
Chemical equation potassium and water?
2K(s) + 2H2O(l) -> 2KOH(s) +H2(g) However, if potassium were dropped into water, there would be so much water that the KOH would not be solid but aqueous so it should read 2K(s) + 2H2O(l) -> 2KOH(aq) +H2(g)
When potassium is dropped into aqueous zinc nitrate zinc and aqueous potassium nitrate form.?
Potassium form in water potassium hydroxide; so the reaction will be:2 KOH + Zn(NO3)2 = 2 KNO3 + Zn(OH)2(s)
Why boiling water is used instead of cold water when potassium manganate is dropped in the boiling water?
Potassium Manganate (VII) also called potassium permanganate, dissolves very quickly in hot water and much slower in cold water.
Was potassium ever included in bombs dropped on Germany in World War 2?
No. while metallic potassium reacts violently with water, it is mild compared to explosives such as TNT. Incendiary weapons may include phosphorus and reactive metals, such as aluminum or magnesium- but not potassium.
Is food color is dropped into water to give it color a chemical change?
no, a physical change
Is a plate is dropped and shattered a chemical change?
A plate dropping and shattering is a physical change. It is not a chemical change, as the material used in making the plate doesn't change.
Is bubbles when aluminuim wire is dropped into HCL a physical change?
No. The aluminum is reacting with the acid; it is a chemical change.
