CR&E C1
True or False
The total mass of the reactants is always greater than the total mass of the products.
What is False?
True or False
The products of a reaction always have the same properties as the reactants.
What is False?
Daily Double!!!
True or False
The total mass of the reactants equals the total mass of the products.
What is true?
True or False
Chemical reactions can create or destroy atoms.
What is False?
Which energy transfer takes place when water freezes to form ice crystals in the atmosphere?
What is energy is transferred from the water into the air.
When you HEAT something up you INCREASE the thermal energy causing atoms to move this way...
What is speed up?
The ROOT BEER, in the root beer float, is an example of which state or states of matter.
What is both a liquid and a gas?
Solids have a definite _______________.
What is both shape and volume?
What can causes ice to transform from a solid to a liquid?
What is heat?
An ice cube sits in an open container of water placed outside on a sunny day. Give two examples of how adding energy as heat to a system may result in a change of state.
What is the ice cube melts and water evaporates?
Why does sodium chloride (NaCl) have different properties from sodium (Na) and chlorine (Cl₂)?
What is it has a different structure and bonding?
How do the products of photosynthesis differ from the reactants?
THINK: This is true of any chemical equation.
What is they contain the same number and type of atoms but are regrouped to form different molecules.
What happens to the mass during the reaction of magnesium and oxygen?
What is the mass is conserved during the reaction?
This is the process by which a liquid, such as water, changes into gas.
What is Evaporation?
What do the letters and numbers in the chemical formula H₂O₂ represent?
What are the type of atoms and amount of each atom in a molecule of hydrogen peroxide?
When coal is burned, sulfur is released into the air, where it reacts with oxygen to produce sulfur dioxide and sulfur trioxide. Do they have the same or different properties?
What is they have different properties than the reactants?
If the formula were written as 3H₂O, what does the coefficient "3" mean?
What is three molecules of water.?
What number completes the balanced equation for rusting: 4Fe + 3O₂ → ____Fe₂O₃?
What is two?
Solid magnesium, Mg, reacts with oxygen gas, O₂, to form the solid magnesium oxide, MgO. Which is a balanced chemical equation for this reaction? Hint - Check the count
What is 2Mg + O₂ → 2MgO?
In the combustion of ethane (C₂H₆), which of the following is produced?
2C₂H₆ + 7O₂ --> 4CO₂ + 6H₂O
THINK: Produced means product
What is Carbon dioxide (CO₂)?
What happens to the mass of paper when it is burned?
THINK: What happens to the substance when it burns?
What is the mass remains the same.?
What happens to the mass of paper when it is burned?
THINK: What happens to the substance when it burns?
What is the mass decreases because some matter is released as gas?
If the formula were written as 3H₂O, what does the subscript "2" mean?
What is two hydrogen atoms?
When copper wire is placed in silver nitrate solution, what solid element forms in the solution?
What is Silver precipitate?
In the chemical formula for water, H₂O:
What does the subscript "2" in H₂ tell you about the atoms in the molecule?
What are two hydrogen atoms in each molecule of water?