Answer:The first method to determine the chemical composition of a substance in space was using light. By determining red shift in the observed spectrum of light they could determine the elements they were observing
Explanation:
Answer:
There are many properties that differentiate metals from non-metals. They are: Luster, conductivity of heat and electricity, physical strength i.e. Brittle or difficult to break, etc.
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How many grams of Cu would be needed to react with 2.0 mol HNO3?
<span>by the equation </span>
<span>3Cu + 8HNO3 --> 3Cu(NO3)2 + 2NO + 4H2O </span>
<span>2.0 mol HNO3 reacts with 3/8 ths as many moles of Cu = 0.75 moles of Cu </span>
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<em>T</em><em>o</em><em> </em><em>f</em><em>i</em><em>n</em><em>d</em><em>:</em><em>-</em><em> </em>Fill in the blanks
<em>A</em><em>n</em><em>s</em><em>w</em><em>e</em><em>r</em><em>:</em><em>-</em>
Sailors used the <u>astrolobe</u> and <u>nautical</u><u> </u><u>c</u><u>h</u><u>a</u><u>r</u><u>t</u><u>s</u> as fixed-points to help them navigate. The <u>compass</u> was invented by the Chinese and was later used by European explorers for navigation