Changes in the skills base and knowledge our students need require new learning goals; these new learning goals change the relationship between assessment and instruction. Teachers need to take an active role in making decisions about the purpose of assessment and the content that is being assessed.
Titanite, or sphene (from the Greek sphenos (ÏÏÎ·Î½Ï), meaning wedge), is a calcium titanium nesosilicate mineral, Ca Ti Si O 5.Trace impurities of iron and aluminium are typically present. Also commonly present are rare earth metals including cerium and yttrium; calcium may be partly replaced by thorium.ue depends on Fe content, with low Fe content causing green and yellow colours, and high Fe content causing brown or black hues. Zoning is typical in titanite. It is prized for its exceptional dispersive power (0.051, B to G interval) which exceeds that of diamond.
show more Determine the chemical formula for each ionic compound. a. strontium nitrate, and ingredient in some fireworks, signal flares, and matches. b,sodium cyanide, a compound used in electroplating and treating metals. c.chromium 3 hydroxide, a compound used to tan and dye substances.