What experimental result would be evidence that a chemical reaction took place when the solutions were combined?
Bubbles formed when the two solutions were combined
. A chemistry teacher carried out several demonstrations, and students recorded their observations.
What is evidence that ionic bonds formed during the precipitation?
Which of the following is evidence that ionic bonds formed during the precipitation?
The precipitate has a high melting point
. A student combines a solution of NaCl(aq) with a solution of AgNO3(aq), and a precipitate forms.
Which changes are evidence of a chemical reaction?
Some signs of a chemical change are a
change in color and the formation of bubbles
. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Which of the following best describes this process that takes place when NH3 is added to water?
Which of the following best describes the process represented above that takes place when NH3 is added to water? It is an acid-base reaction in which a proton is exchanged from H2O to NH3. … It is
an oxidation-reduction reaction
because zinc is oxidized and hydrogen is reduced.
Does a chemical reaction occur when silver nitrate is added to water?
False
: A chemical reaction occurred when silver nitrate was added to water, The lack of temperature change indicates a chemical reaction didn’t occur, The initial disappearance of silver nitrate in water indicates a chemical reaction occurred.
What are the 7 signs of a chemical reaction?
- Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas. …
- Formation of a Precipitate. …
- Color Change. …
- Temperature Change. …
- Production of Light. …
- Volume Change. …
- Change in Smell or Taste.
What are the 4 types of evidence of a chemical reaction?
Chemical reactions can be identified via a wide range of different observable factors including
change in color, energy change (temperature change or light produced), gas production, formation of precipitate and change in properties
.
Is color change a chemical reaction?
A color change may also indicate that
a chemical reaction has occurred
. A reaction has occurred if two solutions are mixed and there is a color change that is not simply the result of a dilution of one of the reactant solutions. A color change may also occur when a solid and liquid are mixed.
How is a precipitate formed in a chemical reaction?
Formation of an insoluble compound will sometimes occur when
a solution containing a particular cation (a positively charged ion) is mixed with another solution containing a particular anion
(a negatively charged ion). The solid that separates is called a precipitate.
Is a precipitate a chemical change?
Precipitation refers to a chemical reaction that
occurs in aqueous solution when two ions bond together to form an insoluble salt
, which is known as the precipitate.
What is ionic and net ionic equations?
A net ionic equation
shows only the chemical species that are involved in a reaction
, while a complete ionic equation also includes the spectator ions. … Identify and cancel out the spectator ions (the ions that appear on both sides of the equation). Want to double check your work?
Why the equation represents a chemical change?
A chemical reaction equation gives
the reactants and products
, and a balanced chemical reaction equation shows the mole relationships of reactants and products. Often, the amount of energy involved in the reaction is given. Dealing with the quantitative aspect of chemical reactions is called reaction stoichiometry.
Is NH3 an acid or base?
Ammonia, NH3, is
a Lewis base
and has a lone pair. It will donate electrons to compounds that will accept them. Donation of ammonia to an electron acceptor, or Lewis acid.
Is AgNO3 acidic or basic?
Answer: No,
AgNO3 does not form an acidic solution nor a basic solution
. In order for something to be considered an acid or base it has to produce either H+ or OH- in water.
What happens when silver nitrate is added to water?
As each drop is added,
a white cloudy haze will appear as
the AgNO3 reacts with any Cl- present in the tap water. With the first drops the solution may momentarily turn a red color but the red color will disappear with stirring.
What happens when silver nitrate is mixed with a solution of sodium chloride?
When silver nitrate solution is added to sodium chloride solution, then
a white precipitate of silver chloride is formed along with a sodium nitrate solution
. (b) It is a double displacement reaction as an exchange of ions takes place in this reaction.
