In a the substances retain their individual chemical and physical properties.

Explanation:

A mixture is defined as a substance in which two or more solutes are added in a solvent. Particles of a mixture never combine chemically with each other.

A stable mixture is defined as a mixture in which solute particles do not settle. Basically, in a stable mixture particles remain their individual properties.

And, when two substances chemically combine to each other then it leads to the formation of a compound or molecule whose chemical properties are different from its reactants.

Therefore, we can conclude that in a mixture, the substances retain their individual chemical and physical properties.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

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the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.