Is boiling water until salt remainds a chemical or physical?

2) Of the 4 diagrams, which is the correct representation of electric field lines if both charges are equal in magnitude and positively charged? A) A B) B C) C D) D

How are humans disrupting the nitrogen cycle? A:sewage runoff B:excess fertilizer C:the use of fossil fuels D:all of the above

What theory is based on the idea that matter and energy have properties of both particles and waves

Question 8 1 pts What is the difference between a cell wall and a cell membrane? The cell wall produces food, the cell membrane breaks down the food to release energy The cell wall blocks substances from leaving the cell membrane allows materials

What type of reaction produces a metal from its metal oxide

A. what are isotopes? b. how are the isotopes of a particular element alike? c. how are they different?

The line of longitude used as the origin in a system of coordinates

In the ground state, has only 1 electron in a p orbital. A. carbon B. fluorine C. hydrogen D. nitrogen E. aluminum

Which of the following is a mixture? alcohol water mercury ink

A gas occupies 3.5 L at standard pressure. Find the volume of the gas when the pressure is 1.5 atm.