Chemistry

Metalloids have properties of both metals and non -metals. True False

All A groups on the Periodic Table: are organized by energy level have the same number of valence electrons are harder to group based on trends compared to the B group transition metals can be grouped into families based on shared characteristics have the same number of electrons on their outermost orbital

2. This is the atomic notation for an isotope of carbon. Label its parts. 13 __ 6 __ 3. For each isotope of carbon, how many protons, electrons, and neutrons are present? (}_{6)^12C Protons __ Neutrons __ Electrons __ (}_{6)^13C Protons __ Neutrons __ Electrons __ (}_{6)^14C Protons __ Neutrons __ Electrons __

How many significant figures are in the number?75.00 m unknown 2

What is the purpose of the fume hood? To store chemicals To protect against chemical fumes To heat substances To dispose of waste

Which of the following is not part of the "fire triangle"? water heat fuel oxygen

4x Which of the following statements describes a difference between a mixture and a pure substance? dx A The density of a mixture can change with temperature, but the density of a pure substance cannot change. 4x B The composition of a mixture can vary from sample to sample, but the composition of a pure substance is always the same. C A mixture has a specific melting point, while the melting point of a pure substance can vary. D A mixture tends to be homogeneous, while a pure substance tends to be heterogeneous.

Laboratory Safety When working in the laboratory, long hair should be square curled tied back frizzed

Return all unused chemicals into their original container. True False

A type of hair color that uses a low-volume hydrogen peroxide that can only deposit color or add tone to the hair would be: a. temporary b. permanent c. semi-permanent d. long-lasting semi-permanent