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How can you tell the difference between a phase change and when a chemical reaction produces a gas?
A phase change should not, in general, require more than one compound. A chemical reaction, by definition, will involve at least two compounds. The only "exception" would be a decomposition reaction, but in that case two different compounds would be formed so it's not really an exception.
Do a chemical reaction produce heat and light?
Chemical reactions can produce heat and energy but not all chemical reactions produce them. Exothermic reactions produce heat and energy (possibly in the form of photons/light), while endothermic reaction absorb them.
What should not be used to indicate a chemical reaction?
Change of shape can not be used to indicate a chemical reaction has happened. Examples of evidence of a chemical reaction are changes in odor or color.
If a chemical reaction produces a gas how can that gas be captured in a test tube?
To capture a gas produced in a chemical reaction in a test tube, you can use a rubber stopper with a glass tube inserted into it. As the gas is produced, it displaces the liquid in the test tube and fills the space above. The glass tube allows for a controlled release of the gas when needed.
How does a student identify a catalyst?
A student can identify a catalyst by observing its role in a chemical reaction, specifically noting that it increases the reaction rate without being consumed in the process. They should look for changes in reaction conditions, such as lower activation energy or altered reaction pathways, while measuring the time taken for reactants to convert into products. Additionally, the presence of a catalyst can often be confirmed by conducting experiments where it is added or removed, observing the resulting changes in reaction speed.
A change in matter that produces new substances is called?
Chemical change. References: Intro to Matter book.
Is a sunburn a chemical reaction or physical change?
Yes, the chemical reaction is your skin produces melanin (brown pigment) to help protect your skin from further damage from the UV rays. This is why humans have evolved to have dark skin in sunny tropical or sub-tropical areas. Your body also naturally produces vitamin D from the sunlight in the fat in your body under the skin and this is a chemical reaction too. So if you don't get out in the sun much you should take a vitamin D supplement or drink fortified milk or soymilk.
Should heat be added for a chemical reaction to take place?
If the reaction is endothermic in nature then heat should be added to it,otherwise all chemical reaction neddn't heat always.
Why should the moles of KHCO3 AND THE MOLES OF KCL PRODUCED BE THE SAME?
The moles of KHCO3 and KCl produced should be the same because they are stoichiometrically related in the chemical reaction that produces them. For every mole of KHCO3 that reacts, it produces one mole of KCl. This means that the number of moles of KHCO3 consumed is equal to the number of moles of KCl produced in the reaction.
What should be balanced in a chemical reaction?
Everything that is unbalanced...
How can you tell the difference between a phase change and when a chemical reaction produces a gas?
A phase change should not, in general, require more than one compound. A chemical reaction, by definition, will involve at least two compounds. The only "exception" would be a decomposition reaction, but in that case two different compounds would be formed so it's not really an exception.
Do a chemical reaction produce heat and light?
Chemical reactions can produce heat and energy but not all chemical reactions produce them. Exothermic reactions produce heat and energy (possibly in the form of photons/light), while endothermic reaction absorb them.
What should not be used to indicate a chemical reaction?
Change of shape can not be used to indicate a chemical reaction has happened. Examples of evidence of a chemical reaction are changes in odor or color.
If a chemical reaction produces a gas how can that gas be captured in a test tube?
To capture a gas produced in a chemical reaction in a test tube, you can use a rubber stopper with a glass tube inserted into it. As the gas is produced, it displaces the liquid in the test tube and fills the space above. The glass tube allows for a controlled release of the gas when needed.
How does a student identify a catalyst?
A student can identify a catalyst by observing its role in a chemical reaction, specifically noting that it increases the reaction rate without being consumed in the process. They should look for changes in reaction conditions, such as lower activation energy or altered reaction pathways, while measuring the time taken for reactants to convert into products. Additionally, the presence of a catalyst can often be confirmed by conducting experiments where it is added or removed, observing the resulting changes in reaction speed.
What happens when lye and water react together?
When lye and water react together, a chemical reaction occurs that produces heat and forms a solution called sodium hydroxide. This solution is highly alkaline and can be corrosive, so it should be handled with care.
What numbers should not be changed to balance the equations?
Coefficients in front of chemical formulas should not be changed when balancing chemical equations. These coefficients represent the number of each molecule or atom involved in the reaction and changing them would change the stoichiometry of the reaction. Only the subscripts within chemical formulas should be adjusted to balance the equation.
