A. True
Chemistry, 25.11.2020 20:20 Clayton2847
PERIODIC TABLE TEST WILL GIVE BRAINLIEST!
Helium is a gas found in the earth.
A. True
B. False
Neon is a gas from the earth. *
A. True
B. False
Elements are pure substances. *
A. True
B. False
Families/Groups on The Periodic Table go in this direction. *
A. vertical
B. horizontal
Rows which are called run horizontal on The Periodic Table. *
A. pecans
B. periods
C. perfect
Click all that apply. Matter is found in . *
A. clothing
B. humans
C. plants
D. cars
The worlds most accurate clock is a . *
A. Timex
B. Rolex
C. Atomic
Humans are made of 99% elements. *
A. True
B. False
A grain of sand is the same size as one atom. *
A. true
B. false
The Periodic Table has elements. *
A.112
B.116
C.96
Answers: 1
Chemistry, 22.06.2019 05:50
What are the 4 phases of matter in order of increasing engery content?
Answers: 2
Chemistry, 22.06.2019 08:00
Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when it’s still hot? separation: filtration of precipitatewhy don’t we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesn’t recrystallize prematurely.analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and “synthetic” salicylic acid is 151-154oc?
Answers: 1
Chemistry, 22.06.2019 20:00
I’m an electrically neutral atomic any element, there are equal numbers of
Answers: 2
Chemistry, 22.06.2019 20:30
Which of the following is not true about the atomic model of substances?
Answers: 1
PERIODIC TABLE TEST WILL GIVE BRAINLIEST!
Helium is a gas found in the earth.
A. True
A. True
Mathematics, 01.12.2020 05:00
Chemistry, 01.12.2020 05:00
English, 01.12.2020 05:00
English, 01.12.2020 05:00
Mathematics, 01.12.2020 05:00
Mathematics, 01.12.2020 05:00