What must occur for a change to be a chemical reaction

How do we know if their is DNA in our food?

Give the major force between ethanol and water. Give the major force between ethanol and water. dipole-dipole ion-dipole dispersion ion-ion hydrogen bonding

Lead (II) iodate (Pb (IO3) 2) has a solubility product constant of 3.69 x 10-13. Calculate the molar solubility of Pb (IO3) 2 in water. 4.30 x 10-7 M 6.07 x 10-7 M 4.52 x 10-5 M 7.17 x 10-5 M

Realizar una oracion empleando los verbos en infinitivo que estan anteriormente (acompañar, bailar, dormir, convivir, proteger)

If 18.25 g hci is dissolved in enough water to make 500.0 ml of solution, what is the molarity of the hci solution

How does phosphorus enter the human body?

When a reaction occurs between atoms with ground state electron configuration 1s2 2s1 and 1s2 2s2 2p5 the predominant type of bond formed is

How does heat transfer takes place between any two systems?

Hydrate name of CaCl2 * 8 H2O

Calculate the heat evolved from a mixture of 14.1 l of sulfure dioxide