Overreacting Flashcards
What happens when bonds are broken?
it requires energy from the surroundings. It is called activation energy.
What happens when bonds are made?
When bonds are made it releases energy back into surroundings
What happens in all exothermic and endothermic reactions?
There is energy required and energy is releases.
What occurs during endothermic reactions?
Endothermic reactions absorb energy so the temperature decreases.
What occurs during exothermic reactions?
Exothermic reactions release energy so the temperature increases
What is an example of reactants and the products that are made?
Sodium reacts with water to form sodium hydroxide and hydrogen
What is the chemical process of photosynthesis?
Photosynthesis is the chemical reaction that allows plants to produce their own food.
What are photosynthesis ingredients?
Carbon Dioxide and Water
What are the photosynthesis products?
Glucose And Oxygen
What is the law of conservation of matter?
During any chemical reaction the number of atoms in a element stays the same
What are the state symbols?
Solid
(s) is a symbol
Na (s) example
What are the state symbols?
Solid
(s) is a symbol
Na (s) example
Why does a symbol equation provide more information?
A symbol equation shows formulas amd how many atoms are in each element
How do we balance equations?
To balance an equation, you can only add or change coefficients
How does the law of conservation of matter work in relation to balanced and unbalanced equations?
the number of atoms will stay the same
Which numbers are the coefficient and subscript?
coefficient is the letter in front
Subscript is the smaller number
How do we interpret if an equation is balanced or not?
When their is unequal numbers of atoms it is unbalnced
If there is a equal number of atoms it is balanced
Why is it important to balance chemical equations?
There must be the same number of atoms of each element
How are periodic tables arranged?
The elements are arranged in increasing order by atomic number
What can the atomic number indicate?
The number of protons and electrons
What are the rules about atom shells?
Start from the inner shell and build outwards
Explain photosynthesis
Photosynthesis is when energy is changed to chemical energy in plant cells.
Explain an atoms valence electrons
It is related to the elements position in the periodic table.
What are noble gases stable?
Noble gases are stable as they have full valence shells
Which chemical bond involve electron transfer?
Ionic
Explain Ionic bonding
a linkage formed from the attraction between oppositely charged ions
Explain covalent bonding
A chemical bond that involves the sharing of electrons to form electron pairs.
What are properties of typical acids
reactive with metals, corrosive
What are properties of typical bases?
Bitter taste, corrosive or caustic, slippery feel
What does the ph scale allow us to measure?
To measure the strength of acids and bases
What does litmus paper do if it is dipped in a neautral substance
It wont change colour because its neutral
What happens if ocean acidity changes?
Increased levels of carbon dioxide in the atmosphere.
Explain Metallic bonding
A metallic bond is formed between free electrons and the positively charged ions
