State 'True' or 'False' for each of the following:
a. Brass is a compound made by combining copper and tin.
b. Sugar can be obained from sugar solution by evaporating the solution to dryness.
c. 12kg of steel and 120N of feathers have the same amount of matter.
d. Seawater is a mixture of compounds.
(Please state clearly the letters[a,b,c,d])
Thank you!:)
2006-09-06 18:15:21 · 5 answers · asked by Greez 2 in Education & Reference ➔ Standards & Testing
A: False - Brass is made from copper and _zinc_. The alloy of copper and tin is called bronze.
B: True
C: False - Newtons is a measure of force, not quantity. If one takes the newtons to refer to the weight of the feathers in Earth's gravitaitonal field, then it is still false, because Earth's gravity is closer to 9.8 m/s² than 10 m/s², so the feathers would be slightly more massive.
D: True.
2006-09-06 18:48:23 · answer #1 · answered by Pascal 7 · 0⤊ 0⤋
a) False, brass is not a compound its an alloy. an alloy is a solid solution of metals. a solutions is a mixture. a mixture can be separated by physical means.
b) True
c) False 120N of feathers is equal to 120kg of feathers. Since:
1 Newton = 1kg x m/s2
d) True
2006-09-07 01:31:42 · answer #2 · answered by Archer 3 · 0⤊ 0⤋
I think one of the answerers is right that brass is an alloy.
B. true
C. DK
D. true
2006-09-07 03:13:45 · answer #3 · answered by Pup 5 · 0⤊ 0⤋
i believe those are all true
2006-09-07 01:19:00 · answer #4 · answered by rajoohay 2 · 0⤊ 0⤋
All true?
2006-09-07 01:20:11 · answer #5 · answered by just me 5 · 0⤊ 0⤋