Question : Is nahco3 ( sodium hydrogen carbonate ) an ionic or covalent bond ?
Answer : nahco3 ( sodium hydrogen carbonate ) is a Ionic bond

nahco3 ( sodium hydrogen carbonate ) is a Ionic bond
What is chemical bond, ionic bond, covalent bond?
Chemical bond
A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds; or through the sharing of electrons as in covalent bonds .
https://en.wikipedia.org/wiki/Chemical_bond

ionic

Ionic bonding
Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds.  The ions are atoms that have gained one or more electrons (known as anions, which are negatively charged) and atoms that have lost one or more electrons (known as cations, which are positively charged).
https://en.wikipedia.org/wiki/Ionic_bonding

covalent or molecular

Covalent bond
A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
https://en.wikipedia.org/wiki/Covalent_bond

LIST IONIC
NaCl
Mg(NO3)2
Barium Sulfate
Cobalt (II) Nitrate
Ba(OH)2
Sodium Chloride
mg
cah2
Cu(NO3)2
Barium Chloride
ammonium
Ca(NO3)2
CaI2
Iron III Oxide
no3
salt
Calcium Phosphate
Fe(NO3)3
Ba(ClO4)2
Barium Fluoride
NH4NO2
NH4ClO3
(NH4)2CO3
NaOCH3
CoCl2
MgF2
Rb2O
BaCl2
LiF
CaF2
Mg3N2
BaO
KF
CaO
Fe2O3
Na2CO3
Al2O3
CuO
Na2S
NH4NO3
K2S
RbCl
sodium hypochlorite
MgSO4
CaSO4
barium oxide
NaBr
KCl
Na2O
NH4Cl
NaI
potassium iodide
Al2S3
KI
FeCl3
NaOH
K3PO4
magnesium nitride
sodium sulfate
Na3PO4
K2O
aluminum sulfide
sodium carbonate
calcium nitrate
KOH
KNO3
agno3
CaS
CaCl2
kbr
magnesium sulfate
K2SO4
mgcl2
sodium sulfide
CuCl2
potassium oxide
potassium chloride
ammonium bromide
silver phosphate
CuSO4 
(nh4)2so4
ammonium sulfate
FeSO4
magnesium iodide
aluminum sulfate
sodium bicarbonate
sodium oxide
Calcium chloride
NH4
sodium iodide
AgCl
ammonium hydroxide
MgO
ammonium nitrate
licl
kmno4
aluminum nitrate
Kl
potassium bromide
NaNH2
NH4OH
sodium bromide
aluminum oxide
copper
potassium nitrate
NO3-1
hydrogen iodide 
MnO2 
NaF
sodium hydroxide
na
calcium oxide
magnesium oxide
iron iii
calcium fluoride
sulfur hexafluoride
k20
iron oxide
alf3 
magnesium chloride
nah
ammonium chloride
silver chloride
baking soda
lithium chloride 
Magnesium
sodium fluoride
lithium fluoride
lih aluminium chloride
bef2
lithium acetate
phosphoric acid ( H3PO4 )
CaBr2 ( Calcium bromide )
NaNO3 ( Sodium Nitrate )
CsCl ( Cesium Chloride )
SrCl2 ( Strontium Chloride )
LiI ( lithium iodide )
nahco3 ( sodium hydrogen carbonate )
Al2(CO3)3 ( Aluminum Carbonate )
Li2O ( Lithium Oxide )
potassium carbonate ( K2CO3 )
libr ( Lithium Bromide )
MgBr2 ( Magnesium Bromide )
SrO ( Strontium Oxide )
CsF ( Cesium Fluoride )
Magnesium Phosphate ( Mg3(PO4)2 )
Ca3(PO4)2 ( Tricalcium phosphate )
BaS ( Barium Sulfide )
Iron (III) Bromide ( FeBr3 )
Ca(OH)2 ( Calcium Hydroxide )
MgS ( Magnesium Sulfide )
Ammonium Phosphate ( (NH4)3PO4 )
sodium citrate
CsBr ( Cesium Bromide )
Ammonium Carbonate ( (NH4)2CO3 )
Iron (II) Chloride ( FeCl2 )
Potassium Dichromate ( K2Cr2O7 )
Lithium Hydroxide ( LiOH )
sodium borate 
Strontium Iodide ( SrI2 )
NH4F ( Ammonium Fluoride )
Strontium Fluoride ( SrF2 )
ZnI2 ( Zinc Iodide )
CoS ( Cobalt (II) Sulfide )
NiCl2 ( Nickel (II) Chloride )
HClO4 ( Perchloric acid )
Barium Bromide ( BaBr2 )
sodium aluminum phosphate
Cesium Oxide ( Cs2O )
CuCl ( Copper (I) Chloride )
CsI ( Cesium Iodide )
Potassium Cyanide ( KCN )
potassium chromate ( K2CrO4 )
FeCO3 ( Iron (II) Carbonate )
V2S3 ( Vanadium (III) Sulfide )
Lithium Nitrate ( LiNO3 )
Chromium (III) Fluoride  ( CrF3 )
Barium Nitrate ( Ba(NO3)2 )
Calcium Acetate ( Ca(C2H3O2)2 )
Aluminum Hydroxide ( Al(OH)3 )
Calcium Sulfide ( CaS )
Rubidium Sulfide ( Rb2S )
Beryllium Oxide ( BeO )
Potassium Acetate ( KC2H3O2 )
Barium Bromide ( BaBr2 )
bleach
Zinc Bromide ( ZnBr2 )
Lead (II) Sulfate ( PbSO4 )
Lead (II) Sulfide ( PbS )
Potassium Phosphate ( K3PO4 )
Barium Hydroxide ( Ba(OH)2 )
Lithium Carbonate ( Li2CO3 )

LIST COVALENT BOND / MOLECULAR BOND
CH2O
bromine
sulfur trioxide
polyatomic ions
ch4o
water
h20
boron trichloride
diamond
nitric acid
clf
dinitrogen monoxide
hydrogen chloride
so4
metalloids
nitrogen trifluoride
carbon tetrafluoride
b2h4
ch3li
CH3OH
SCl2
CS2
CF4
NF3
NO
icl
PCL3
Cl2
clo2
NCl3
O2
SiO2
HBr
BrCl
iodine
N2
SF6
glucose
CBr4
vegetable oil
NH3
NO2
CH4
H2S
ethanol
PCl5
dinitrogen pentoxide
N2O5
CCL4
P4
phosphorus trichloride
dinitrogen trioxide
C6H12O6
CH3NH2
NBr3
carbon dioxide
BrCl
SF4
methanol
acetic acid 
phosphorus trifluoride 
phosphorus pentachloride
SO2
P2O5
SiF4
PH3
nitrogen tribromide
silicon tetrafluoride
methane
carbon tetrachloride
nitrogen dioxide
Br2
P4O10 
H2 
C6H6
dextrose
TiBr4
glycerol
N2O2
naphthalene
H2SO3
xef4
toluene
aspirin
acetone
H2SO4
SiCl4
benzoic acid
CO
stearic acid
CO2
nitrogen
distilled water
FCl
BCl3
Hydrobromic acid
silicon dioxide
SO3
N2O
fructose
salicylic acid
c12h22o11
tap water
HC2H3O2
nitrogen trichloride
sulfur dioxide
N2O3
N2O4 HCN
cyclohexane
phosphorus pentoxide
hydrogen peroxide
i2
C2H4
citric acid
h2o2
paraffin wax
gacl3
CH3CH3
vinegar
hydrogen bromide
PF3
HNO3
sucrose
CHCl3
sugar
brf
FeO
chlorine
s8
carbon monoxide
silicon tetrachloride 
f2
nitrogen bromide
corn starch
sulfuric acid
oxygen
ammonia
hydrochloric acid
becl2 ( Beryllium Chloride )
hcl
h2o
AlCl3
aluminium chloride
hydrogen fluoride
aluminum chloride
bf3 ( boron trifluoride )
hi ( hydriodic acid )
titanium dioxide ( TiO2 )
PBr3 ( Phosphorus tribromide )
OF2 ( Oxygen difluoride )
hf ( hydrofluoric acid )
hydrogen sulfide
aluminum carbide ( Al4C3 )
hexane ( C6H14 )
SiH4 ( silane )
xenon trioxide ( XeO3 )
seo2 ( Selenium dioxide )
urea
silicon carbide ( SiC )
ozone ( O3 )
pyridoxine hydrochloride 
C2H6 ( Ethane )
Cl2O ( Dichlorine monoxide )
NI3 ( Nitrogen triiodide )
IF5 ( Iodine pentafluoride )
isopropyl alcohol ( C3H8O )
polyethylene
SCl4 ( Sulfur tetrachloride )
PO4 ( Phosphate ) 
CH3COOH ( acetic acid )
lactic acid ( C3H6O3 )
c2h5oh
CCl
graphite
OCl2
butane

Containing both (ionic and covalent)
sodium acetate
Caco3
BaSO4
na2so4
magnesium nitrate
calcium carbonate
AlBr3

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Resources
www.quora.com
answers.yahoo.com
answers.com
www.quia.com
quizlet.com
www.reference.com
socratic.org
https://en.wikipedia.org
https://en.wikipedia.org/wiki/Ionic_bonding
https://en.wikipedia.org/wiki/Covalent_bond
https://en.wikipedia.org/wiki/Chemical_bond
pubchem.ncbi.nlm.nih.gov

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Question : Is nahco3 ( sodium hydrogen carbonate ) an ionic or covalent bond ?
Answer : nahco3 ( sodium hydrogen carbonate ) is Ionic bond