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romanna [79]
3 years ago
15

Direction is not important when describing an object's motion. O True False

Chemistry
2 answers:
skelet666 [1.2K]3 years ago
6 0
True it’s not important
mina [271]3 years ago
6 0
I believe ,,,,false
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How many moles are in 2.8x10^23 atoms of Calcium?
Zielflug [23.3K]

Answer: 1 mole ➡️ 6.022×10²³ atoms of si.

X mole ➡️ 2.8×10²⁴ atoms of si.

X = 2.8×10×10²³/6.022×10²³

= 28/6.022

= 4.65 moles.

Explanation:

8 0
3 years ago
each year, one person in north america uses resources equal to how much land? A. 12 miles B. 12 acres C. 120 acres
KATRIN_1 [288]
B. 12 acres

i think i don’t do geography
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3 years ago
(c) Polar solutes were separated by hydrophilic interaction chromatography (HILIC) with a strongly polar bonded phase. How would
Lelu [443]

Answer:

(c) The retention time would be higher (d) The retention time would be lower.

Explanation:

For the polar solutes which were separated using the hydrophilic interaction chromatography (HILIC) with a strongly polar bonded phase, the retention time would be higher if eluent were changed from 80 vol% to 90 vol% acetonitrile in water.

However, for the polar solutes which were separated using the normal-phase chromatography on bare silica with methyl t=butyl ether and 2-propanol solvent, the retention time would be lower if the eluent were changed from 40 vol% to 60 vol% 2-propanol.

5 0
3 years ago
Mercury has a density of <br> 13.55 g/mL .What would be the volume of a 122 g sample?
Salsk061 [2.6K]

Answer:

V = 9.0037

Explanation:

V = M/D

V = 122/13.55

V = 9.0037

4 0
3 years ago
two atoms have the same number of protons but different number of neutrons. what can you conclude about these masses
Marina CMI [18]
These masses are isotopes. By definition, isotopes of an element have the same number of protons as the given element, but different numbers of neutrons.
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