Round off each of the following numbers to two significant figures:

(a) 0.436

(b) 9.000

(c) 27.2

(d) 135

(e) 1.497 X 10-3

(f) 0.445

When wave-particle duality was applied to the electron, it explained why the energy of the electron is quantized because: a. The electron is a standing wave that can only have an integer number of wavelengths b.

How many significant figures does 0.070 have?

Which of the following statements is most accurate? A. Energy is stored in chemical bonds and released when the bonds are broken. B. Energy is absorbed when chemical bonds are broken and released when new bonds form. C.

Which element is a metalloid? a. argon (ar) b. silicon (si) c. potassium (k) d. magnesium (mg)

4. Which has the longer wavelength: light with a frequency of 7.32 X 1014 Hz or light with a frequency of 6.0 x 1014 Hz? Explain without doing any calculations.

What kind of chemical bond does salt have?

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