Unit 4
Which of the following substances is most acidic
Lemon juice
The stomach lining that secretes hydraulic acid which is that Ph range of the digestive juices in the stomach
0 to 2
Hydrogen and oxygen react to produce water which of the following is the correctly balanced chemical equation for this reaction
2h2+ 02-2h2o
Is solution prepared by dissolving carbon dioxide and water turns a piece of blue litmus paper red what will be the most likely range of the pH values for the solution
3 to 4
Copper chloride and aluminum react to produce aluminum chloride and copper which of the following is the correctly balance of chemical equations for this reaction
3CUCL2+ 2Al-> +3Cu
Before a chemical reaction the total mass of two reactance is measured to be 40 g after reaction what should the total mass of the products
40 g
Went to substances were killed by bubbles were produced and the temperature dropped this was likely means that
A chemical reaction to place
Maxine and acid with a base will form
A salt
Compounds are formed when
Atoms of different elements bond chemically
Which is the best among the given substances
Baking soda
If alkalis I have a 5PH another word for alkalis is
Base
One property of bases is that they have a
Better taste
litmas paper can you tell you it is solution is acidic neutral or basic by changing the color when placed in a solution if you test a basic solution within litmus paper it will turn
Blue
When to clear liquids where can I find any BK the temperature increase and a yellow powder for this most likely means that
Chemical reaction took place
The difference between elements and compounds is that
Elements contain only one type of atom and compounds contain more than one type of Atom
When dissolved in water acid produce
Hydrogen
When dissolved in water bases produce
Hydroxide (oH) ions
The law of conservation of matter states that
Matter is not created or destroyed
Which of the following represents a molecule that is not a compound?
O2
The elements oxygen forms molecules that each contain two oxygen Atoms The element carbon and oxygen form molecules that each contain one carbon Atoms and two oxygen Atoms .which statement is true
Oxygen is an element while carbon dioxide is a compound
What is produced in a neutralization reaction
Salt
If vinegar and lemon juice are weak acids what do you think is generally true about the taste of acidic foods they taste
Sour
All of the following are indications of a chemical reaction except one which one is not an indicator that a chemical reaction has taken plaice
The dissolving substance in another
Are unique shape of a salt crystal is due to
The structure of the nacl molecule
What happens to the atoms in a chemical reaction
They are rearranged
Which statement is true when acids and bases are next together
They neutralize each other
Every molecule of water contains
Two hydrogen Atoms and one oxygen Atoms
Water H2O contains hydrogen and oxygen hydrogen is an explosive gas while oxygen is a flammable gas how do the physical properties of water and the element within it compare
Unlike oxygen and hydrogen water forms a liquid at a room temperature under normal air pressure
Elements combine in many ways to form compounds which of the following is a compound
Water
