Chemical Reactions

Complete the sentence.

During a chemical reaction, atoms ________.

Completa la oración. Durante una reacción química, los átomos ________.

• can appear

• can disappear

• get rearranged

• stop moving and vibrating

Tags

NGSS.MS-PS1-5

Identify the product(s) in the following chemical reaction: Chromium oxide + Carbon → Chromium + Carbon monoxide

• Chromium and carbon.

• Chromium and carbon monoxide.

• Chromium and carbon dioxide.

• Chromium oxide and carbon.

Tags

NGSS.MS-PS1-2

In chemical reactions, a product is _________.

En reacciones químicas, un producto es _________.

• any substance that is made of the greatest number of atoms

• any substance that is made from the least number of atoms

• any substance that is to the left of the arrow

• any substance to the right of the arrow

In a chemical reaction, the mass of the reactants is 200 grams. Which of the following could represent the mass of the products?

• 26.6 grams.

• 200 grams

• 3.3 grams.

• 2000 grams.

Tags

NGSS.MS-PS1-5

In a chemical reaction, the mass of the reactants is 65.3 grams. The reaction produces two products, and the mass of Product 1 is 25.3 grams. What is the mass of the second product?

• 40 grams.

• 7.2 grams.

• 35 grams.

• 42 grams.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Complete the sentence.

During a chemical reaction, __________.

• a small amount of matter is destroyed during the process

• the mass of the atoms of the product(s) is greater than that of the reactant(s)

• a new substance(s) with the same number of atoms as the initial substance(s) is formed

• the number of atoms in the product(s) is less than that of the reactant(s)

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

"Meals, Ready to Eat" are an instant hot meal developed by the U.S. military for troops. The meal heats up when water is added to the magnesium metal tray because the chemical reaction between water and magnesium is an _________.

• energy-conserving reaction

• exothermic reaction

• evaporation reaction

• endothermic reaction

Tags

NGSS.MS-PS1-4

When you strike a match, this is an example of a ____________ because heat and light are produced.

• endothermic reaction

• exothermic reaction

• the temperature decreased

• energy was absorbed during this reaction.

Mixing baking soda and vinegar is an example of an endothermic reaction. This means...

• energy is taken in during the chemical reaction.

• baking soda and vinegar are products in this reaction.

• energy is released during the chemical reaction.

• there is no change in energy during the chemical reaction.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The graph shows the energy change that occurs during a chemical reaction. What conclusion can be reached based upon the graph?

El gráfico muestra el cambio de energía que ocurre durante una reacción química. ¿A qué conclusión se puede llegar con base en el gráfico?

• Energy was neither absorbed nor released during this reaction.

• The energy of the reactants is less than the energy of the products.

• The energy of the products is less than the energy of the reactants.

• The energy of the products and the energy of the reactants are equal.

Tags

NGSS.HS-PS1-4