chemical reaction

The substances at the beginning of a chemical equation are called the ____

• product
• yield
• chemical symbol
• reactants

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

Tags

NGSS.MS-PS1-2

In a chemical reaction, everything to the right of the arrow is called ______________.

• Products
• Yields
• Molecules
• Reactants

Which of the following is evidence of a chemical reaction?

• fizzing
• water changing to ice
• saltwater
• paper being cut in half

Tags

NGSS.MS-PS1-2

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

• The shape of the coal changes
• Oxygen is present
• A new substance is produced
• Coal is made up of more than one element

Tags

NGSS.MS-PS1-2

What are Chemical Reactions?

• It's when you mix substances.
• a process in which atoms rearrange to form new substances
• When something bubbles.
• letter and numbers showing the types and number of atoms

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT evidence that that a chemical reaction has occurred?

• produces light/heat
• production of a gas
• formation of a precipitate
• melting

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A different chemical substance is formed when _____.

• water boils
• metal rusts
• ice melts
• rock is crushed

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?

• cutting a piece of paper
• folding a piece of paper
• tearing a piece of paper
• burning a piece of paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Digesting your food is an example of 

• chemical change
• physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5