The correct answer is elements in family 7 have similar properties because elements in the same group or family have the same number of valence electrons.
Answer;
C. unchanged rock and mineral fragments
Explanation;
A large number of landforms and features found in desert environments are formed as the result of weathering. Weathering is defined as the breakdown and deposition of rocks by weather acting in situ
The two main types of weathering which occur in deserts are Mechanical weathering, which is the disintegration of a rock by mechanical forces that do not change the rock's chemical composition and Chemical weathering, which is the decomposition of a rock by the alteration of its chemical composition.
By contrast much of the weathered debris in deserts has resulted from mechanical weathering. Chemical weathering, however, is not completely absent in deserts. Over long time spans,clays and thin soils do form.
Answer:
37.62 g
Explanation:
First we <u>convert 6.9x10²² atoms of C₁₂H₂₂O₁₁ to moles</u>, using <em>Avogadro's number</em>:
- 6.9x10²² atoms ÷ 6.023x10²³ atoms/mol = 0.11 mol
Then we <u>convert moles of C₁₂H₂₂O₁₁ to grams,</u> using its molar mass:
Molar mass of C₁₂H₂₂O₁₁ = (C molar mass)*12 + (H molar mass)*22 + (O molar mass)*11 = 342 g/mol
- 0.11 mol * 342 g/mol = 37.62 g
The ratio of effusion of rates of oxygen (O2) to Hydrogen (H2) is calculated as follows
rate of O2/ rate of H2 = square root of molar mass of H2/molar mass of O2
= square root = 2 /32 = 0.25