Some metals cannot be welded in air because hot metal reacts with oxygen and nitrogen in the air. How do you think such metals are welded?

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)