, Which of the following substances is classified as a homogeneous mixture?
(a) A sample of solid bronze
(b) Orange juice with pulp
(c) A carbonated soda
(d) Pure H2O
(e) A mixture that is only legally recognized in 12 states - CORRECT ANSWERS-(a) A
sample of solid bronze
What is the SI unit of length?
(a) inch
(b) centimeter
(c) meter
(d) mile
(e) kilometer - CORRECT ANSWERS-(c) meter
The wavelength of a red laser pointer is 632.8 nanometers (nm). What is this
wavelength in
micrometers (µm)?
(a) 6.328 x 10⁻¹
µm
(b) 6.328 x 10⁵
µm
(c) 6.328 x 10⁻⁵
µm
(d) 6.328 x 10⁶
µm
(e) 6.328 x 10⁴
µm - CORRECT ANSWERS-(a) 6.328 x 10⁻¹
µm
Which of the following is classified as a physical change?
(a) Samples of hydrogen and oxygen gas combine to form H2O upon heating
(b) A solid piece of dry ice sublimes into the gas phase, producing a dense fog
(c) The mercury in a thermometer expands when heated
(d) (b) and (c)
(e) All of the above - CORRECT ANSWERS-(d) (b) and (c)
Which of these elements is paired incorrectly with its chemical symbol?
(a) As = astatine
(b) Cu = copper
(c) Sn = tin
(d) Pb = lead
(e) W = tungsten - CORRECT ANSWERS-(a) As = astatine
Which of the following phase changes is the opposite of deposition?
(a) A sample of solid bronze
(b) Orange juice with pulp
(c) A carbonated soda
(d) Pure H2O
(e) A mixture that is only legally recognized in 12 states - CORRECT ANSWERS-(a) A
sample of solid bronze
What is the SI unit of length?
(a) inch
(b) centimeter
(c) meter
(d) mile
(e) kilometer - CORRECT ANSWERS-(c) meter
The wavelength of a red laser pointer is 632.8 nanometers (nm). What is this
wavelength in
micrometers (µm)?
(a) 6.328 x 10⁻¹
µm
(b) 6.328 x 10⁵
µm
(c) 6.328 x 10⁻⁵
µm
(d) 6.328 x 10⁶
µm
(e) 6.328 x 10⁴
µm - CORRECT ANSWERS-(a) 6.328 x 10⁻¹
µm
Which of the following is classified as a physical change?
(a) Samples of hydrogen and oxygen gas combine to form H2O upon heating
(b) A solid piece of dry ice sublimes into the gas phase, producing a dense fog
(c) The mercury in a thermometer expands when heated
(d) (b) and (c)
(e) All of the above - CORRECT ANSWERS-(d) (b) and (c)
Which of these elements is paired incorrectly with its chemical symbol?
(a) As = astatine
(b) Cu = copper
(c) Sn = tin
(d) Pb = lead
(e) W = tungsten - CORRECT ANSWERS-(a) As = astatine
Which of the following phase changes is the opposite of deposition?
