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What are Two main kinds of changes that you can observe when chemical reaction occur?
a precipitate is a solid that forms during a chemical reactions
What else can I help you with?
When two clear iquids make yellow is it a chemical change?
Chemical change: The clear liquids are potassium iodide and lead nitrate. When mixed, they form a new chemical--lead iodide.
What do you call two or more different kinds of atoms joined together by a chemical reaction?
When more than one atom is joined together by a chemical reaction, the result is called a chemical bond which holds together molecules and the strength of the bond depends on the atoms or the reaction. ---------------------------- A molecule.
What is one other change in chemical changes?
There are many different kinds of chemical reactions, which involve many different kinds of chemical changes. All of these changes are observable, but some are more easily observable than others. Fire is an example of a chemical change that is extremely obvious and easily observed. When a piece of wood burns, it is changed into ash, as well as gases which are temporarily visible in the form of flame. We observe a dramatic change in temperature, since fire produces a lot of heat. Solid logs can be turned into gaseous carbon dioxide and water vapor, along with ashes and various other combustion products. But fire is not the only kind of chemical reaction. You can take two transparent aqueous solutions, mix them together, and have a chemical reaction take place that is invisible to the eye, but which can be analysed with various tests or equipment. One protein can be transformed into another protein, and both types of protein can look exactly the same. Chemical identity can be very subtle. Some chemical reactions involve visible changes of color, but most do not. Chemical reactions can produce lots of heat, or very little heat (but with a sensitive thermometer, you can detect even small changes in temperature). Chemical reactions can cause a change of phase (as from solid to gas) but they usually don't. Chemical reactions can alter solubility, so that an insoluble product is formed, which as a result causes a visible precipitate. There are many other possible results of a chemical reaction.
How a balanced chemical equation really illustrate that mass is never lost or gained in a chemical reaction?
The kinds of atoms and the number of each kind are the same on both sides of a balanced chemical equation.
How are physical and chemical changes affected by temperature?
Chemical reactions involve changing the materials that you're dealing with into new materials, and the changes that you see are the result of the appearance of the new materials. The new material might have a different phase than the starting materials. For example, if you create something new from two liquids and it happens to be a gas, then you will get gas bubbles. There will be a new material with a new phase that wasn't there before. Also, you can observe chemical reactions by seeing color changes, if the new material has a different color than the starting materials. When a chemical reaction takes place, usually the temperature will also change. It will either go up or down, sometimes imperceptibly. Those are the kinds of changes that you might see. In chemical reactions the changes that you observe are caused by the creation of or loss of different kinds of materials. Physical changes are similar in some ways because you are looking at the same kinds of things--changes in the phase, the color, the temperature. But the physical changes are changes in the condition of the material or changes caused by mixing materials together or taking them apart--just mixing or separating, not the creation of something new. For example, temperature changes are physical changes if they are caused by heating or cooling. If you add heat to something and the temperature goes up, that is a physical change. If you cool it off and the temperature goes down, that is a physical change. Phase changes are physical changes also, if they are caused by heating or cooling. If you take some water and you heat it up and it changes to gas, that is a physical change. You still have water, only now it is steam instead of liquid. Also included in physical changes are color changes that are caused simply by mixing or by diluting a material or, in some cases, even by heating. For example, if you turn on an electric range and the element gets hot, you can see a color change. That is also a physical change. Physical changes and chemical changes have much in common in that you are looking at similar kinds of results. The difference is whether the appearances or differences that you see are from a change in the condition of the material or from a change in what materials are present. That's the kind of thing you need to look for to distinguish between a chemical reaction and a physical change. It takes an inference to make that distinction. Sometimes it is very difficult to make that distinction and in some cases even chemists can get into arguments sometimes over what constitutes a physical or a chemical change. For example, when salt dissolves in water, some people say that is simply a physical change because if you evaporate away the water, you have the salt back again. Other people argue that there is a chemical change because the material present in solution has different properties than the separated pure water and pure salt. The solution will conduct electricity and the pure water and pure salt will not. So, there are cases where the distinction between physical and chemical changes gets kind of blurred. In a few weeks we will have more criteria we can use to distinguish between physical and chemical changes.
What are two main kinds of changes that can observe when chemical reactions occur?
a precipitate is a solid that forms during a chemical reactions
Two mains kinds of changes that you can observe when chemical reactions occur?
ripping a towel, or breaking a glass window
What type of chemical absorbs energy?
The two kinds of chemical reactions are endothermic and exothermic. A chemical reaction that absorbs energy is called an endothermic reaction.
What kinds of energy is given off in a chemical reaction?
nuclear
When two clear iquids make yellow is it a chemical change?
Chemical change: The clear liquids are potassium iodide and lead nitrate. When mixed, they form a new chemical--lead iodide.
What do you call two or more different kinds of atoms joined together by a chemical reaction?
When more than one atom is joined together by a chemical reaction, the result is called a chemical bond which holds together molecules and the strength of the bond depends on the atoms or the reaction. ---------------------------- A molecule.
What Kinds of chemical changes?
Exothermic reactions. E.g. combustion, oxidation
Is a change a physical or chemical change?
There are two kinds of changes - physical and chemical. It depends on how the change is made.
What two kinds of energy changes can take place during a chemical reaction?
Two types of energy changes that can occur in a chemical reaction are (1) endothermic and (2) exothermic. Endothermic is where energy is added to the system and exothermic is where energy is given off by the system.
What two main kinds of change that you can observe when chemical reactions occur?
ripping a towel, or breaking a glass window
What are some kinds os chemical changes that release energy?
Some examples of chemical changes that release energy include combustion reactions (burning of fuel), oxidation reactions (rusting of iron), and exothermic reactions such as the reaction between acids and bases. These reactions typically result in the production of heat, light, or sound.
What chemical reactions involve two main kinds of changes?
formation of new substances!!
