What is the main principle behind the law of conservation of matter? A. Mass does not change phase during a reaction. B. The total mass does not change during a reaction. C. Heat is added during a reaction for the mass to remain constant. D. Mass will always remain constant unless a change has occurred.

Listen Which of the following ions has the highest NO stretching frequency? NO^+ NO_(2)^- NO_(3)^- Cannot be determined

Select all that apply Which describe polar covalent compounds? Their molecules are not attracted to each other. Groups of molecules make a crystal structure. They dissolve in water. They have high melting and boiling points.

3. Determine the molecular formula to which the following empirical formulas and molar masses pertain: a) SNH(188.35g/mol) b) CoC_(4)O_(4)(341.94g/mol)

The C-Hbond is __ polar covalent nonpolar hydrogen nonpolar covalent polar ionic

Hydrogen bonds can occur in molecules where hydrogen is bonded to __ A. bromine or nitrogen B. None of these C. carbon D. oxygen or nitrogen

What is the code for anthrax? Answer instructions A23. B22. B23. A22.

Long hair in the laboratory must be cut short. held away from the experiment with one hand. always neatly groomed. tied back or kept entirely out of the way with a hair band, hairpins, or other confining device. 1 po

8. What is the proper procedure for heating substances in a test lube? 9.What is the proper way to handle hot glassware? 10. You have been injured in the laboratory (cut, burn,etc.). What is the first thing you should do? 11. What should you do when gathering glassware and equipment for an experiment? 12. What is the best procedure for placing a piece of glass tubing into a rubber stopper? 13. Should you wear personal eyeglasses in the lab in place of approved eyewear? Why or why nut? 14. What should you to prepare for lab if you have long hair? 15. What are the things should you NOT wear in the lab? 16. What is the best footwear for the laboratory?

Read I all II procedures thoroughly before performing a laboratory investigation True False

Hot Questions

Which of the following alcohols will be used in this lab? Butanol Propanol Ethanol Methanol

Acidic dyes work best in low pH environments. are used for staining negatively charged molecular structures. are negatively charged and work best at low pH. are lipid soluble. are negatively charged.

How many protons does carbon have? 40 39.09 6 12

Measurements taken with a spectrometer require a __ to eliminate background readings from components other than what is being measured in the sample. Select one: a. sample b. replicate c. treatment d. blank

11. [Periodic Table and Periodic Law] Which of the following elements has the greatest tendency to attract electrons in a chemical bond? A. Carbon B. Oxygen C. Fluorine D. Nitrogen

-Develop possible solutions - Brainstorming - think of as many solutions as possible of \( \mathrm{CO}_{2} \) wooden car

8. Every chlorine atom has: 7 electrons 17 neutrons a mass number of 35 an atomic number of 17

1. $6P_{4}O_{10}+H_{2}O$ $3H_{3}PO_{4}$

What is the maximum number of electrons that can occupy a given orbital if they have different spins? 4 2 1 3

How will we know how many electrons are in each ATOM? Type your answer here