Grade 8 Science Concepts Recall

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Joyce Margaret Miguel

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Grade 8 Science Concepts Recall


Froggy Jumps Grade 8 Science Concepts RecallVersión en línea Let's have a quick recall after the sembreak. por Joyce Margaret Miguel 1 What is a pure substance made of only one kind of element? a Compound b Mixture c Element 2 What do you call a substance made of two or more elements chemically combined in fixed proportions? a Mixture b Compound c Element 3 Which property identifies substances by their chemical composition? a Physical appearance b Density c Chemical composition 4 What is the basic unit of an element? a Molecule b Atom c Ion 5 Name a commonly taught atomic model where electrons orbit the nucleus. a Bohr model b Plum pudding model c Solar system model 6 Which term describes a mixture with uniform composition throughout? a Pure substance b Homogeneous mixture c Heterogeneous mixture 7 What are the two main types of pure substances? a Atoms and Molecules b Mixtures and Solutions c Elements and Compounds 8 Which statement about compounds is true? a They are always elements b They can only be formed by mixing c They have fixed compositions. 9 Which property helps determine how a substance is used in applications? a Color b Shape c Uses 10 What happens when elements combine chemically? a They form compounds. b They form mixtures c They become elements 11 What is a pure substance made of only one element called? a Element b Mixture c Compound 12 A substance formed from two or more elements bonded together is called? a Element b Compound c Mixture 13 What is a homogeneous combination of two or more substances? a Suspension b Solution c Mixture 14 The least amount of a compound that retains its properties is a? a Mixture b Atom c Molecule 15 Which property is used to describe a substance's ability to rust? a Melting point b Reactivity c Color 16 A material made of two or more elements chemically bonded is called? a Element b Compound c Mixture 17 Which model suggests atoms in a small dense nucleus surrounded by electrons? a Dalton model b Plum pudding model c Rutherford-Bohr model 18 What do you call the center of an atom containing protons and neutrons? a Orbital b Electron cloud c Nucleus 19 Which particles are negatively charged? a Protons b Electrons c Neutrons 20 Elements are arranged in the periodic table by? a Atomic number b Mass number c Electron count 21 What type of bond involves sharing electron pairs? a Metallic bond b Covalent bond c Ionic bond 22 What is the smallest unit of a compound? a Ion b Molecule c Atom 23 Which property helps identify a metal's shine and malleability? a Solubility b Luster c Density 24 In mixtures, substances retain their own properties: true or false? a False b True c Sometimes 25 What is the term for a substance that cannot be decomposed chemically? a Element b Mixture c Compound 26 The atomic model that introduced electrons in orbits was proposed by? a Erwin Schrödinger b Niels Bohr c John Dalton 27 A substance with uniform composition is called? a Homogeneous material b Heterogeneous material c Solution 28 Which property describes how a substance dissolves in water? a Solubility b Density c Conductivity 29 What is the basic unit of an element's identity? a Atom b Ion c Molecule 30 Which model places electrons in orbit around the nucleus? Also called as Nuclear Model. a Cloud model b Bohr model c Thomson model

Grade 8 Science Concepts Recall

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Grade 8 Science Concepts RecallVersión en línea

por Joyce Margaret Miguel

What is a pure substance made of only one kind of element?

What do you call a substance made of two or more elements chemically combined in fixed proportions?

Which property identifies substances by their chemical composition?

What is the basic unit of an element?

Name a commonly taught atomic model where electrons orbit the nucleus.

Which term describes a mixture with uniform composition throughout?

What are the two main types of pure substances?

Which statement about compounds is true?

Which property helps determine how a substance is used in applications?

What happens when elements combine chemically?

What is a pure substance made of only one element called?

A substance formed from two or more elements bonded together is called?

What is a homogeneous combination of two or more substances?

The least amount of a compound that retains its properties is a?

Which property is used to describe a substance's ability to rust?

A material made of two or more elements chemically bonded is called?

Which model suggests atoms in a small dense nucleus surrounded by electrons?

What do you call the center of an atom containing protons and neutrons?

Which particles are negatively charged?

Elements are arranged in the periodic table by?

What type of bond involves sharing electron pairs?

What is the smallest unit of a compound?

Which property helps identify a metal's shine and malleability?

In mixtures, substances retain their own properties: true or false?

What is the term for a substance that cannot be decomposed chemically?

The atomic model that introduced electrons in orbits was proposed by?

A substance with uniform composition is called?

Which property describes how a substance dissolves in water?

What is the basic unit of an element's identity?

Which model places electrons in orbit around the nucleus? Also called as Nuclear Model.