A student is examining two samples of the element lead. Which statement best describes the two samples? Both the physical and chemical properties are the same in each sample. Both the physical and chemical properties of the lead change from sample to sample. The physical properties of the lead are the same in each sample. The chemical properties of the lead change from sample to sample.

How many Sodium ions are in 156 moles of Sodium ions? $9.39\times 10^{23}$ Sodium ions $2.59\times 10^{-24}$ Sodium ions $6.022\times 10^{23}$ Sodium ions 1.56 Sodium ions

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

Name the following organic compounds: compound name $\square $ $CH_{2}-CH_{2}-CH_{3}\\ \downarrow \\ CH_{3}-CH_{2}-C-CH_{2}-CH_{2}-CH_{3}\\ CH_{3}-CH_{2}-CH_{2}$ $\square $ $CH_{3}-CH_{2}-CH_{2}\\ CH_{3}-CH_{2}-CH_{2}-C-CH_{2}-CH_{2}-CH_{3}\\ \downarrow \\ CH_{2}-CH_{3}$ $\square $ $\square $ $CH_{3}\\ \downarrow \\ CH_{3}-CH_{2}-CH_{2}-CH_{3}\\ CH_{3}-CH_{3}$ $\square $ $\square $

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