Daisy poured some water into a glass. Then he dropped a marble into the glass of water. He noticed that the level of water rose. The rise in water level indicates _________.

Alfie is wearing a pair of glasses and enters a warm house after being outside on a cold day. His glasses fog up because of _____________.

Aluminum is used for making cooking utensils. Which of the following properties of Aluminum are responsible for the same? I. Good thermal conductivity II. Good electrical conductivity III. Ductility IV. High melting point

Why are the elements in group 18 unreactive?

Why do elements within a group have similar chemical properties?

Dry ice is used in fire extinguishers. The dry ice is stored in the cylinder in a solid form. When sprayed on a fire it quickly changes into the gas known as Carbon Dioxide (CO2). What is this change of state called?

What type of microscope uses electrons to provide a three-dimensional view of the surface of the object?

An atom of Sodium has an atomic number of 11 and a mass number of 23. This means that _____________.

These pictures show different models of the atom proposed by scientists. The proper arrangement from oldest to most recent would be __________.

Why was Democritus’s original atomic theory revised?

Beth accidentally left her crayon box in the car on a hot day. What happened to her crayons?

what element is Zr?

Scientists have discovered a new substance on a distant planet. It has mass, definite volume, but cannot be compressed. What is its state of matter?