Answer:
Mass = 3. 6 ( 2 significant digits)
Explanation:
Number of moles = 0.045
Mass = ?
Relationship between number of moles and mass is given as;
Number of moles = Mass / molar mass
Mass = Number of moles * Molar mass
Mass = 0.045 * 80.91g/mol
Mass = 3.641
Mass = 3. 6 ( 2 significant digits)
1 and 3 only because metal are easily to loss electron while non metal are difficult to loss electron that's why it called heavy elements.
Answer: Calcium
Explanation: The chemical element Calcium (Ca), atomic number 20, is the fifth element and the third most abundant <u><em>metal</em></u> in the earth's crust. The metal is trimorphic, harder than sodium, but softer than aluminium.
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Answer:
I think in the light-dependent reactions, energy absorbed by sunlight is stored by two types of energy-carrier molecules: <u>ATP</u> and <u>NADPH</u>. The energy that these molecules carry is stored in a bond that holds a single atom to the molecule. For ATP, it is a phosphate atom, and for NADPH, it is a hydrogen atom.
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The atomic theory changed because as time passed by our technolgy has been improving our ability to find answers to these theories.