One radioactive isotope of calcium has an atomic mass of 47. How many protons are in this calcium-47 nucleus? A) 17 B) 20 C) 27 D) 47

Which process releases the energy that eventually produces lightning in a thunderstorm? 0 Water droplets freeze. Water condenses to form clouds. O Moisture enters the upper atmosphere. Air pressure decreases, causing rapid air movement.

View the topographic map of Antarctica. Use latitude and longitude to tell the location of the following sites to the nearest 5 degrees

Which of the following would have to lose three electrons in order to achieve a noble gas electron configuration? Si Mg Al Cl P a. Cl b. P c. Mg, Al, P d. Al e. Si, P

Does altering salt marshes affect the land near coastlines?

How does gas chromatography separate substances in a mixture of compounds?

Consider the following thermochemical equation: C (s) + O2 (g) → CO2 (g) ΔH = - 393 kJ CO (g) + ½O2 (g) → CO2 (g) ΔH =

Two colorless solutions are mixed together. Bubbles form as the solution is stirred. Give TWO possible explanations for this result.

What is a light-year? A. the distance light travels in one earth year B. the distance light travels from the sun to the earth C. the distance light travels in one orbit of the moon D. the time it takes light to travel across the universe

What's is a logical way that you could begin to investigate why your tire had low air pressure?

after balancing the redox equation FeCl3+Zn--->ZnCl2+Fe, what are the coefficients, in order from left to right?