Substances

Which of the following is an example of Pure substance?

• Vinegar

• Water

• Milk

• Coffee

These are the types of elements in the periodic table that are solid at room temperature, except for mercury. What are these?

• Elements      

• Metalloids 

• Metals

• Non-metals 

3. It is a type of radioactive radiation that has low penetrating power and can be blocked by a sheet of paper. What is it?

•  Alpha

• Beta

• Gamma

• Proton

Teacher DM mixed 70% of ethanol with water that contained 30%. What is the solvent in the mixture?

• Ethanol

• Water

• Ethanol and water    

•  Solute

Which of the following elements is the most abundant in the earth crust?

• Oxygen

• Iron

• Calcium

• Silicon

How many percent does aluminum in the earth crust?

• 47%   

• 28%

• 9%     

• 8%

Teacher Go dissolved salt in a glass of water. What is the solute?

•  Water

• Salt

• Salt and water

• Glass

Which mixture has the smallest particles?

• Element

• Colloid

• Suspension    

• Solution

What are the subatomic particles of an atom?

• Electron, Nucleus, and Neutron

• Nucleus, Neutron, and Proton

• Electron, Neutron, and Proton

• Electron and Proton

An atom consists of 2 electrons and 4 neutrons. How many protons are there?

• 2

• 4

• 6

• 8