Chemical Reactions: Atoms and Changes

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Quiz on atoms and chemical reactions.

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Ivy

Estados Unidos

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Chemical Reactions: Atoms and Changes


Chemical Reactions: Atoms and ChangesVersión en línea Quiz on atoms and chemical reactions. por Ivy 1 What best defines a chemical reaction? a A change in temperature without chemistry b A change of state only c A process where substances transform into new substances d A physical change with no new substances 2 What happens to atoms during a chemical reaction? a The atoms rearrange to form new substances b Only bonds break without new substances c Atoms are created or destroyed d Atoms stay in the same arrangement 3 Difference between reactants and products? a Reactants are catalysts; products are substrates b Reactants are always gases; products are solids c Reactants are starting substances; products are formed after the reaction d Reactants become elements; products become compounds 4 Which statement correctly describes a molecule? a A single atom without bonds b A phase of matter c Two or more atoms bonded together d A substance with only one element 5 What indicates a chemical reaction often? a Only a change in shape b No energy change c Same substances rearranged d New substances with different properties 6 Where are electrons primarily located in an atom? a In the nucleus as electrons b Outside the nucleus in electron orbitals or cloud c Inside the nucleus only d Between the nucleus and protons 7 Why are protons important in identifying an element? a They determine the element's identity by atomic number b They are the only particles in the nucleus c They determine the element's phase d They have no role in identity 8 What is the nucleus of an atom composed of? a Only protons b Only neutrons c Electrons and protons d Protons and neutrons 9 What happens to bonds in a chemical reaction? a Only bonds break without new substances b New bonds cannot form c Old bonds break and new bonds form d Bonds remain unchanged 10 Which is evidence of a chemical change? a Change of shape only b No energy exchange c Formation of a new state of matter only d Color change, temperature change, or gas release

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Chemical Reactions: Atoms and Changes

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Chemical Reactions: Atoms and ChangesVersión en línea

por Ivy

What best defines a chemical reaction?

What happens to atoms during a chemical reaction?

Difference between reactants and products?

Which statement correctly describes a molecule?

What indicates a chemical reaction often?

Where are electrons primarily located in an atom?

Why are protons important in identifying an element?

What is the nucleus of an atom composed of?

What happens to bonds in a chemical reaction?

Which is evidence of a chemical change?