What is a system?

O

A. A piece of scientific equipment

B. A technique for recording data

c. Aliquid in which reactions take place

D. An isolated piece of the world

Which elements have the quantum numbers (4,3,-2,+1/2) and (5,2,-1,-1/2)

What is the atomic number of a neutral atom with an electron configuration of 1s22s22p63s23p54s24p1?

When the sun earth and moon are position to form a right triangle high tides are lower than normal true and false

Which process is a physical change? iron rusting milk turning to curd water boiling paper burning hard water staining pipes

What is the change in enthalpy when 18 g of water vapor condenses at 100 C? (Δ Hv = 41 kJ/mol) A. 18 B. 41 C. - 41 D.-410

Which statements indicate what the fossil record suggests about evolution on Earth? Check all that apply. Humans have only recently existed on Earth. Organisms originally lived only in Earth's water. Life on Earth started when water formed on Earth.

What does homogeneous mixture of elements mean

As an acid is added to neutral water the [OH-] will

What is the mass in grams of 5.00moles of CH4? How many moles of oxygen gas O2, are present in a 38g sample of O2

25 In general, for a gas at a constant pressure, A the temperature of the gas is inversely proportional to its volume B. the temperature of the gas is inversely proportional to its pressure C.