Which of the following is a mixture?
A) air
B) gold
C) salt
D) iron
E) helium
Answer: A
You might also like to view...
White dwarfs like Sirius B are typically the size of ________
Fill in the blank(s) with correct word
A beam of x-rays at a certain wavelength are scattered from a free electron that is at rest, and the scattered beam is observed at 45.0° from the incident beam
What is the change in the wavelength of the x-rays during this process? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 1.75 × 10-13 m B) 2.76 × 10-13 m C) 0 m D) 3.56 × 10-13 m E) 7.10 × 10-13 m
The universe's density, compared to the critical density, determines the ________ of space
Fill in the blank(s) with correct word
A metallic key ring of 1.00 cm diameter is placed in a fire and heated up. What would you expect would happen to the inside diameter of the ring as it heats up?
1.It will shrink as the metallic portion expands. 2.It will expand as the metallic portion expands. 3.It will stay the same size as the metallic portion expands. 4.It is impossible to say what will happen to the open area in the center of the ring.