6) How many valence electrons does an atom of Cu possess?

ОА) 2

Ов) 9

Ос) 11

OD) 3

OE) 1

Is chilli a element compound or mixture?

When swimming the 5000 meter freestyle race, a swimmer travels at a steady pace of 68 seconds for each lap. Each lap of the pool is 100 meters. How long will it take for this swimmer to swim the 5000 meters

The half-life of strontium-90 is 28 years. how long will it take a 52 mg sample to decay to a mass of 13 mg?

A piece of charcoal used for cooking is found at the remains of an ancient campsite. a 0.94 kg sample of carbon from the wood has an activity of 1580 decays per minute. find the age of the charcoal.

Which is an example of pseudoscience? A. use of X-rays to observe the bones of the arm B. use of DNA analysis to determine paternity C. use of vaccines to prevent the occurrence of disease D. use of astrology to predict the personality of a child

If an ice cube melts at 0ºC but water also freezes at 0ºC, what is the difference between melting and freezing in terms of ... 8. The energy involved in the phase changes and 9. The motion of the particles of the substances during the phase changes?

What is the element Ar classified as in the periodic table?

Using the clausius clapeyron equation determines the heat of vaporization from experimental measurements of vapor pressure. the vapor pressure of dichloromethane is measured as a function of temperature and the results are tabulated.

Why is it important for people to understand how to properly dispose of waste in a watershed?

As you travel from a solid to a gas, energy is being absorbed or given off?