Answer:
An expression for the combined total dollar amount he earned this month is $(7x + 14y) where x + y = 103.
Explanation:
Let the no. of hours worked as tutor be x
Earning as tutor in 1 hour = $7
Earning as tutor in x hour = $7*x = $7x
Let the no. of hours worked as waiter be y
Earning as waiter in 1 hour = $14
Earning as waiter in y hour = $14*y = $14y
Given that total hours worked in the month = 103 hours
therefore, x + y = 103 ----> (1)
Total amount earned in the month = Earning as tutor in x hour + Earning as waiter in y hour = $(7x + 14y)
An expression for the combined total dollar amount he earned this month is $(7x + 14y) where x + y = 103.
Answer:
Since the middle of the 19th century, minerals have been classified on the basis of their chemical composition. Under this scheme, they are divided into classes according to their dominant anion or anionic group (e.g., halides, oxides, and sulfides).
Explanation:
Apart from the free gases in Earth’s atmosphere, some 20 elements occur in nature in a pure (i.e., uncombined) or nearly pure form. Known as the native elements, they are partitioned into three families: metals, semimetals, and nonmetals. The most common native metals, which are characterized by simple crystal structures, make up three groups: the gold group, consisting of gold, silver, copper, and lead; the platinum group, composed of platinum, palladium, iridium, and osmium; and the iron group, containing iron and nickel-iron. Mercury, tantalum, tin, and zinc are other metals that have been found in the native state.
Answer:
Because , the advantage of steam distillation over simple distillation is that the lower boiling point reduces decomposition of temperature-sensitive compounds. Steam distillation is useful for the purification of organic compounds, although vacuum distillation is more common
Explanation:
Answer:
4.9 atm
Explanation:
convert 16.0g of CH4 to moles
16.0 g CH4 x 1 mol CH4/16.0 g CH4 = 1.00 mol of methane
convert the temp into Kelvins: 27 + 273 = 300.K
PV = nRT
(P) (5.0 L) = (1.00 mol) (0.0821 L atm/mol K) (300.K)
P = 4.9 atm
