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