Ionic Bonding
metal atoms lose electrons and form ..........
positive ions/cations
how does covalent bond form?
sharing of electrons
which part of the plant absorbs water and minerals?
roots/root hair cell
what gas is produced in photosynthesis?
oxygen/O2
what organism releases carbon dioxide by breaking down dead plants and animals?
decomposers/microorganisms
the charge of an ion depends on gaining or losing of ----------
electrons/valence electrons
describe the covalent bond in O2
double bond
what nutrient is responsible for the formation of chlorophyll?
magnesium
what are the raw materials (reactants) in photosynthesis?
carbon dioxide and water
which process removes carbon in the air?
photosynthesis
What is the expected number of valence electrons for an atom of a group 5A element?
5
how many electron(s) is/are shared by one atom of hydrogen in water?
1
what substance is used to test for the presence of starch in leaves?
iodine
what are the products of photosynthesis?
glucose (starch) + oxygen
give at least 3 processes where carbon is released in the environment
decomposition, burning of fossil fuels, respiration
Sodium reacts with fluorine to form an ionic solid. Write the chemical formula.
NaF
covalent bond forms from sharing of electrons between 2 ___________ atoms
non-metal/s
what color indicates for the positive test of starch?
blue-black/black/dark blue
write the word equation of photosynthesis
carbon dioxide + water --> glucose + oxygen
the huge increase in the amount of carbon dioxide in the air can lead to _________.
global warming/greenhouse effect
What is the charge of magnesium in MgCl2?
2+
Describe the kind of covalent bond forms in nitrogen gas.
triple bond
Plants use nitrates as a supply of nitrogen, which is needed to make _______ for healthy growth.
protein
what is the chemical formula of glucose?
C6H12O6
give at least 2 activities (impact) of people that can contribute in the increase of carbon dioxide in the environment.
burning of fossil fuels, deforestation