Balancing Chemical Equations

Front

Which titled article is specifically about a chemical change? Options:

How Baking Soda Reacts with Vinegar

,

How Rust Can Be Scraped off of Metal

,

How Metals Respond to Electrical Currents

,

How Elements Can Change Phase When Heated

Back

How Baking Soda Reacts with Vinegar

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

If you cut a wooden block in half, each half would have:
- Half the density of the original piece
- Twice the density of the original piece
- The same density as the original piece

Back

The same density as the original piece

Front

Which best represents a balanced equation? Options: 120 grams of carbon plus 20 grams of oxygen → 200 grams of carbon dioxide, 120 grams of carbon plus 50 grams of oxygen → 200 grams of carbon dioxide, 120 grams of carbon plus 80 grams of oxygen → 200 grams of carbon dioxide

Back

120 grams of carbon plus 80 grams of oxygen → 200 grams of carbon dioxide

Tags

NGSS.MS-PS1-5

Front

How many atoms of hydrogen are involved in the reaction 2H2O2 → 2H2O + O2?

Back

4

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Number of hydrogen atoms in two molecules of ammonia formed from 2 nitrogen and 6 hydrogen atoms?

Back

6

Tags

NGSS.MS-PS1-1

Front

Which is best represented by the equation? 2Mg + O₂ → 2MgO

Back

Law of Conservation of Mass

Tags

NGSS.MS-PS1-5

Front

When chemicals react in a closed container, which must be true?

Back

The mass both before and after the reaction is the same.

Tags

NGSS.MS-PS1-5

Front

A chemistry teacher combines 20 grams of lemon juice with 25 grams of baking soda in a flask covered with a balloon. The flask and balloon have a combined mass of 105 grams. What is the mass of the entire setup after a reaction has occurred?

Back

150 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Why is the equation 2Na (s) + H2O (l) → 2NaOH (aq) + H2 (g) not balanced?

Back

There is not enough water in the reactants.

Tags

NGSS.MS-PS1-5

Front

CH4(g) + __O2(g) → CO2(g) + 2H2O(g)

Back

4

Tags

NGSS.MS-PS1-5