Chemistry
Grade-10
Easy
Question
Number of C's in 2 molecules of Na2CO3 is:
- 1
- 2
- 3
- 5
Hint:
Subscript shows the no. of atoms.
The correct answer is: 2
The number of C's in 2 molecules of Na2CO3 is: 2
Atoms of Carbon in 1 molecule = 1
Atoms of carbon in two molecules = 1 
2 = 2
Related Questions to study
Chemistry
Which of the following answers will balance the equation below?
__K + __Br2 → __KBr
Which of the following answers will balance the equation below?
__K + __Br2 → __KBr
ChemistryGrade-10
Chemistry
Which statement is not a description of a chemical reaction?
Which statement is not a description of a chemical reaction?
ChemistryGrade-10
Chemistry
A chemical change is different from a physical change because in a chemical change
A chemical change is different from a physical change because in a chemical change
ChemistryGrade-10
Chemistry
When the equation KClO3 → KCl + O2 is balanced, what is the coefficient for KClO3?
When the equation KClO3 → KCl + O2 is balanced, what is the coefficient for KClO3?
ChemistryGrade-10
Chemistry
What are the missing coefficients for the following equation:
___Cr + ___Fe(NO3)2 →___Fe + ___Cr(NO3)3
What are the missing coefficients for the following equation:
___Cr + ___Fe(NO3)2 →___Fe + ___Cr(NO3)3
ChemistryGrade-10
Chemistry
When the following equation is balanced, what is the coefficient for NaBr?
Na + FeBr3 → NaBr + Fe
When the following equation is balanced, what is the coefficient for NaBr?
Na + FeBr3 → NaBr + Fe
ChemistryGrade-10
Chemistry
Balance this reaction:
___C3H8 +___O2 →___CO2 + ___H2O
Balance this reaction:
___C3H8 +___O2 →___CO2 + ___H2O
ChemistryGrade-10
Chemistry
Balance this reaction:
____ RbNO3 + ____ BeF2 →____ Be(NO3)2 + ____ RbF
Balance this reaction:
____ RbNO3 + ____ BeF2 →____ Be(NO3)2 + ____ RbF
ChemistryGrade-10
Chemistry
Balance this reaction:
____ HCN + ____ CuSO4 →____ H2SO4 + ____ Cu(CN)2
Balance this reaction:
____ HCN + ____ CuSO4 →____ H2SO4 + ____ Cu(CN)2
ChemistryGrade-10
Chemistry
Balance this equation:
H2 + N2 → NH3
Balance this equation:
H2 + N2 → NH3
ChemistryGrade-10
Chemistry
Balance this equation:
Al2O3 → Al + O2
Balance this equation:
Al2O3 → Al + O2
ChemistryGrade-10
Chemistry
Balance the following:
____ Al + ____ HCl → ____ AlCl3 + ____ H2
Balance the following:
____ Al + ____ HCl → ____ AlCl3 + ____ H2
ChemistryGrade-10
Chemistry
Balance the following:
____ Fe + ____ Cl2 → ____ FeCl3
Balance the following:
____ Fe + ____ Cl2 → ____ FeCl3
ChemistryGrade-10
Chemistry
Which of the following is an example of a chemical change?
Which of the following is an example of a chemical change?
ChemistryGrade-10
Chemistry
What type of change occurs when a new substance is formed that has different properties from the original substance?
What type of change occurs when a new substance is formed that has different properties from the original substance?
ChemistryGrade-10
