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When cars are left in a junk yard, what was once shiny steel turns into brown, brittle rust. What type of change is this?
Na2CO3
breaking a wooden ruler
5
physical change
products
a bond formed when atoms share electrons
chemical change
Electrons in the highest occupied energy level of the atoms
Which of these is MOST responsible for chemical reactions?
Na2CO3
breaking a wooden ruler
5
physical change
products
a bond formed when atoms share electrons
chemical change
Electrons in the highest occupied energy level of the atoms
When you combine vinegar and baking soda, it gives off gas. The reactants are vinegar and baking soda, what is the gas
Na2CO3
breaking a wooden ruler
5
physical change
products
a bond formed when atoms share electrons
chemical change
Electrons in the highest occupied energy level of the atoms
How many atoms are present in one molecule of NaHCO2?
Na2CO3
breaking a wooden ruler
5
physical change
products
a bond formed when atoms share electrons
chemical change
Electrons in the highest occupied energy level of the atoms
Which of the following is an example of a physical change?
Na2CO3
breaking a wooden ruler
5
physical change
products
a bond formed when atoms share electrons
chemical change
Electrons in the highest occupied energy level of the atoms
What is a covalent bond?
Na2CO3
breaking a wooden ruler
5
physical change
products
a bond formed when atoms share electrons
chemical change
Electrons in the highest occupied energy level of the atoms
Which compound has the following : 3 Oxygen, 1 Carbon, 2 Sodium
Na2CO3
breaking a wooden ruler
5
physical change
products
a bond formed when atoms share electrons
chemical change
Electrons in the highest occupied energy level of the atoms
A melting ice cube is undergoing what type of change?
Na2CO3
breaking a wooden ruler
5
physical change
products
a bond formed when atoms share electrons
chemical change
Electrons in the highest occupied energy level of the atoms
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