Which statement about endothermic reactions is true?
Responses
The reactants create energy to form products.
The reactants create energy to form products.,
The reaction container always feels hot.
The reaction container always feels hot.
Energy from an outside source is continuously being added.
Energy from an outside source is continuously being added.
More heat is given off than is put into the reaction.
Energy from an outside source is continuously being added.
Which chemical formula shows a covalent compound?
Responses
CO2
upper case C O subscript 2,
MgO
upper case M lower case g upper case O,
NaCl
upper case N lower case a upper case C lower case l
LiBr
CO2
How do ionic bonds differ from covalent bonds?
Responses
Electrons are shared in a covalent bond.
Electrons are shared in a covalent bond.
Electrons are transferred in a covalent bond.
Electrons are transferred in a covalent bond.
Protons are transferred in a covalent bond.
Protons are transferred in a covalent bond.
Protons are shared in a covalent bond.
Electrons are transferred in an ionic bond.
How do ionic bonds differ from covalent bonds?
Responses
Electrons are shared in a covalent bond.
Electrons are shared in a covalent bond.
Electrons are transferred in a covalent bond.
Electrons are transferred in a covalent bond.
Protons are transferred in a covalent bond.
Protons are transferred in a covalent bond.
Protons are shared in a covalent bond.
Protons are shared in a covalent bond.
Electrons are transferred in an ionic bond while electrons are shared in a covalent bond.
What is true when a reaction has reached equilibrium?
Responses
The reaction has stopped.
The reaction has stopped.
The concentration of the products is changing.
The concentration of the products is changing.
The concentration of products and reactants is constant.
The concentration of products and reactants is constant.
The concentration of the reactants is changing.
The concentration of the products and reactants is constant.
What reaction would the chemical equation 2H2O→2H2+O2 represent?
Responses
formation of water
formation of water
replacement of water
replacement of water
combustion of water
combustion of water
decomposition of water