Question 4(Multiple Choice Worth 4 points) (01.06 MC) Water is a pure substance. Which of the following is true about water? A chemical change is required to separate the elements present in it. A physical change is required to separate the elements present in it. It is made up of two compounds, each with a different set of atoms. It is made up of an element and a compound.

Which of the following is the SI unit for molar concentration? $mol/m^{3}$ $mol/L^{3}$ $m/mol^{3}$

When you balance the Separate Water simulation how many individual oxygen atoms do you need on the products side to complete the balanced equation? 1 2 3 4

Determine which type of property each statement describes by typing "physical or "chemical" in the blank. Hydrogen is a colorless tasteless, and odorless gas. $\square $ Hydrogen is very combustible in the presence of oxygen. $\square $ Hydrogen is very reactive with most elements. $\square $ Hydrogen is the least dense of all elements. $\square $

Which of the following is an empirical formula? $C_{3}H_{6}$ $C_{3}H_{8}$ CH $C_{2}H_{4}$

Which of the following has the most mass per mole? Oxygen Nitrogen Carbon Potassium

What is the electron configuration for oxygen, O? $1s^{2}2s^{2}2p^{3}$ $1s^{2}2s^{2}2p^{6}3s^{2}$ $1s^{2}2s^{2}2p^{4}$ $1s^{2}2s^{2}2p^{6}3s^{2}$

Gasoline, paints, thinners solvents, natural gas acetylene are all examples of potential: A. Toxic hazards. B. Flammable hazards. C. Combustible hazards. D. All of the above. E. None of the above.

Trans fats and partially hydrogenated oils are the same thing. False True

Is this compound ionic or covalent? $NO_{2}$ ionic covalent

(b) $H_{3}C-CH-CH_{2}-CH_{2}-CH_{3}\\ H_{2}C-CH_{3}$ 2-Ethylpentane Spell out the full name of the compound. The correct name is $\square $