Year 8 Science Structure of the Atom

What is the charge of a proton?

• Negative

• Positive

• Neutral

• Variable

Which subatomic particle has a negative charge?

• Proton

• Neutron

• Electron

• Nucleus

What is a mixture?

• A pure substance

• A substance with a fixed composition

• A combination of two or more substances that are not chemically bonded

• A substance that cannot be broken down into simpler substances

Which subatomic particle has no charge?

• Proton

• Neutron

• Electron

• Nucleus

What causes atoms to bond together to form molecules?

• Electrostatic repulsion

• Gravitational attraction

• Electrostatic attraction

• Nuclear fusion

Tags

NGSS.HS-PS1-1

What important conclusion did Rutherford draw from his gold foil experiment?

• That electrons have a negative charge

• That the nucleus is positively charged and dense

• That electrons move in specific orbits around the nucleus

• That atoms are indivisible and indestructible

What does it mean if a substance is described as pure?

• It contains only one type of atom

• It is free from impurities

• It has a high density

• It is a mixture of different chemicals

What did the Rutherford model reveal about the structure of an atom?

• That electrons orbit the nucleus in fixed paths

• That the nucleus contains positively charged particles

• That the nucleus is made up of neutrons and electrons

• That electrons are evenly distributed within the atom

Why is purity important in chemical substances?

• It increases the density of the substance

• It ensures consistency in reactions and properties

• It reduces the melting point of the substance

• It makes the substance more reactive

What happens when atoms gain or lose electrons?

• They become positively charged

• They become negatively charged

• Their mass changes

• Their nucleus changes

Tags

NGSS.MS-PS2-3