When iodine solution is mixed with an unknown sample of food, the mixture turns a blue black color. this color change indicates the presence of?

If rust is scraped off a nail, and the nail is shiny on the inside, the inside wasA. chemically changed also. B. not chemically changed. C. physically and chemically changed. D. neither physically nor chemically changed.

Consider these ground-state ionization energies of oneelectron species: H = 1.31 x 10³ kJ/mol He⁺ = 5.24 x 10³ kJ/mol Li²⁺ = 1.18 x 10⁴ kJ/mol (a) Write a general expression for the ionization energy of any one-electron species.

What mass of pcl5 will be produced from the given masses of both reactants? 27 60?

Explain how burning a candle is an example of both physical and chemical changes.

Compared to a 1.0-mole sample of NaCl (s), a 1.0-mole sample of NaCl (l) has a different number of (1) ions (2) empirical formula (3) gram-formula mass (4) electrical conductivity

Write the complete balanced equation for the reaction that occurs when C3 H8 combusts in O2.

Which one of the following is not a homogeneous mixture? Question 18 options: vegetable soup carbonated beverages saline solution brewed tea

Choose the substance with the lowest surface tension. Choose the substance with the lowest surface tension. a) H2O b) (CH3) 2CO c) CH3CH2CH2CH3 d) C6H6 e) CH3OH

Which of the following is not true for atoms? They are building blocks of matter They are made of protons, neutrons, and electrons They are able to be divided by a chemical reaction. They are the smallest particle of any element.

The ductility of a material is the measure of a) The amount of elastic deformation that can be sustained before yielding b) The capacity of a material to absorb energy when it is deformed elastically c) The degree of plastic deformation that has