Chemistry 9th Grade

What are the elements that 'Aristotle' found as building blocks of all substances?

• Fire, water, air and earth

• Fire, air, earth and plasma

• Air, earth, water and plasma

• Fire, water, earth and plasma

Tags

NGSS.MS-PS1-1

Which one of the symbols is NOT matching with other elements?

(Hydrogen, Litium, Carbon, Oxygen)

• H

• Li

• Ne

• O

Which one of the compounds do not match with their commonly used names?

• Ammonia- NH3

• Baking Soda- NaHCO3

• Slaked Lime- Ca(OH)2

• Vinegar- CH3COH

What is the name of the lab equipment?

Which one is NOT one of the goals of alchemy?

• to turn base metals to gold

• to achieve rejuvenation and perhaps immortality

• using trial and error method

• relies on scientific theories and experimental results

Which one of the properties of 'Co' are correct?

• It's an element

• It's a formula

• It has same type of atoms

• It's a symbol

'He deduced the existence of very tiny, negatively charged particles and named them electrons' According to this information who is the person found electrons?

• Rutherford

• J.J. Thomson

• Bohr

• Dalton

What is 'Ground state'?

• An electron losing energy

• An electron absorving energy

• Highest energy level

• Lowest possible energy level

Tags

NGSS.HS-PS1-4

^{Which one of the information given is true due to '85₃₇Rb'?}

• The proton number is 37

• The mass number is 85

• The neutron number is 48

• The electron number is 85

Tags

NGSS.MS-PS1-1

Finding places of elements in the periodic table by using _____.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2