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19. Which is nota possible clue that a chemical change has occurred The substance melts. The color changes. A precipitate forms. Bubbles are produced.?
The statement "The substance melts" is not a possible clue that a chemical change has occurred. Melting is a physical change, as it involves a change in the state of matter from solid to liquid without altering the substance's chemical composition. In contrast, color changes, precipitate formation, and bubble production typically indicate chemical changes.
Why carbon monoxide formed in burning of a hydrocarbon?
Carbon monoxide is formed during the burning of a hydrocarbon when there isn't enough oxygen present for complete combustion. Incomplete combustion of hydrocarbons can lead to the formation of carbon monoxide instead of carbon dioxide. It is a toxic gas and can be harmful to human health when inhaled.
Why color is an unreliable clue to the identify of a mineral?
Color alone is unreliable because many minerals come in a variety of colors due to impurities or variations in their chemical composition. This means that different minerals can have the same color, making it difficult to identify them based solely on this characteristic. It is more accurate to rely on other physical properties like hardness, luster, and crystal form for mineral identification.
Is wax melting a chemical or physical or chemical property?
Physical change. The wax was solid and now it is a liquid. All phase changes are physical changes.
How does adding the DNS solution stop the enzymatic catalyzed reaction?
Adding a DNS (dinitrosalicylic acid) solution stops enzymatic catalyzed reactions by denaturing the enzymes involved, preventing them from further catalyzing reactions. DNS reacts with reducing sugars produced by the enzyme-catalyzed reaction, forming a colored product that can be measured to determine the amount of sugar present at the time of stopping the reaction.
Is the flammability of ether a physical or chemical change?
The flammability of ether is a chemical change because it involves the breaking and forming of chemical bonds to produce heat and light. When ether reacts with oxygen during combustion, new chemical compounds are formed.
Can a chemical property be the ability to react with ammonia?
Yes. The clue is in the word 'react'. Any reaction a substance undergoes is a chemical property.
What is catylst?
In chemistry - a catalyst - is a chemical added to an experiment to speed the reaction - without combining with any of the chemicals present.
What chemical equation?
i have no clue
What are the five clues that suggests a chemical reaction is taking place?
first when there's a physical change in the substance second there will be a solution or a formula to that substance third is, it involves temperature fourth is change in color of the substance fifth is the bubbling of another substance is yet an another clue that a chemical reaction has occured.
What should be used to identify each puppy after birth?
i have no clue
A change in color when two solutions are mixed together is a clue that what has taken place?
A change in the color of a solution is a sign thatthere is a chemical change happening. A chemical change happens when two substances combine forming another substance. It can also happen when two or more substances decompose.
Changing the course or pathway of a chemical reaction so that it requires less activation energy?
Catalysis is the process that lowers the activation energy required for a chemical reaction to occur. Catalysts speed up reactions without being consumed in the process, aiding in the formation of products.
What is the clue that a reaction will be a decomposition reaction?
In decomposition reaction, single reactant will breakdown to form two or more products.
Is food spoiling a chemical change?
Yes, it is a chemical change. It only takes one experience with a rotten egg to learn that they smell different that fresh eggs. When eggs and food spoil, they undergo a chemical change. The change in odor is a clue to the chemical change Chemical Reactions Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions. The particles of one substance are rearranged to form a new substance. The same number of particles that exist before the reaction exist after the reaction.
How do Identify where a letter was posted?
Normally letters are stamped and this stamp may provide a clue.
Which is a clue that a chemical change has taken place?
Well, there are four clues to a chemical change. The first clue is a transfer of energy. For example, energy is transferred from methane in natural gas to cook food. The second clue is a change in color. Food browning while being cooked is an example of this. The third clue is the production of a gas. Some cleaning chemicals create bubbles upon contact with soap scum. This is evidence of a chemical change. The last clue is the formation of a precipitate. The ring of soap scum in a bathtub is a precipitate, and evidence of a chemical change.
