Observing Chemical Change
Describing Chemical Reactions
Moles
Chemical Reactions
Potpourri
100
One of the following is NOT a physical change: splitting wood, melting ice, burning wood or dissolving salt in water.
What is burning wood?
100
In the formula 5CaSO4, this is the number of oxygen atoms.
What is 20?
100

The number of particles in a mole.

What is 6.022x10^23 particles.

100
A reaction that releases energy is called this.
What is exothermic?
100
You can balance chemical equations by changing these.
What are coefficients?
200
This is the definition of chemistry.
What is the study of matter and how matter changes?
200

The substances located to the left of the arrow, what comes out of a chemical reaction.

What are products?

200

The mass of a mole of niobium atoms.

What is 92.9 grams?

200
Baking soda and vinegar combined results in this type of chemical reaction.
What is endothermic?
200
This describes a synthesis reaction.
What is two elements combine to form a compound (more complex substance)?
300

These are broken and formed between atoms during a chemical reaction.

What are bonds?

300
These are substances you have at the beginning of a chemical reaction and are listed on the left hand side of the arrow of a chemical equation.
What are reactants?
300

The mass of a mole of potassium iodide atoms.

What is 166 grams?

300

During a chemical reaction chemical bonds can be formed when electrons are shared, gained, or lost. T/F

What is all true?

300
These are the two types of changes that can occur in matter.
What are physical and chemical changes?
400

When carbon dioxide and water are the products, this type of chemical reaction occurred. 

What is combustion?

400

The coefficient that would go before Cl2.

____ H2 + ____ Cl2 --> ____ HCl

What is 1?

400

The number of atoms in 118.71 grams of tin.

What is 6.022x10^23?

400

An increase in temperature does this to a chemical reaction.

What is increases the speed?

400

These may not be changed when balancing chemical equations, as this would change the chemical.

What are subscripts?

500

Signs that a chemical reaction has taken place.

What is a change in energy (temperature change), color change, formation of a precipitate, formation of a gas?

500
Explain why it is necessary to balance chemical equations.
What is because the principle of conservation of mass states that in a chemical reaction, the total mass of the reactants must equal the total mass of the products?
500

The number of moles of sodium present in this chemical reaction.

2Na + Cl2 --> 2NaCl

What is 2?

500

When the formation of products equals the production of reactants.

What is equilibrium?

500
These two chemical reaction types could be considered opposites.
What are synthesis and decomposition?
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