DCP 1 2.0 Questions (24-25)

Categorize

Options (4)

Water droplets attract one alonger and form a larger pool of water

Water sticks to a apiderweb after a rainstorm

Water sticks to your hands after you wash them

Water from a fountain forms droplets

Organize these options into the right categories

Cohesion

Adhesion

Match

Match the following

• Element

• Chemical change

• Metalloids

• Physical change

• Non metals

only 1 capital letter

a new substance is formed

has properties of both metals and nonmet

a change in size or shaoe

Brittle, insulator, dull

• only 1 capital letter

• a new substance is formed

• has properties of both metals and nonmet

• a change in size or shaoe

• Brittle, insulator, dull

Fill in the Blanks

Categorize

Options (10)

O₂

KBr

Fe

N₂O₄

H₂O

NaCl

Ne

Ar

Kr

Xe

Organize these options into the right categories

Element

Compound

Hotspot

A student is comparing four elements on the periodic table. The elements are labeled in the image.

Which TWO elements have physical properties that are the MOST similar?

Multiple Select

Student 1 claims that whenever the color of a substance changes, a chemical change has occurred.

Student 2 claims that food coloring can change the color of a substance without causing a chemical change. 

To test their claims, the students add red food coloring to a glass of water. The students observe that the clear water turns a light pink color. Their teacher then runs a test to show that the pink solution contains both water molecules and food coloring molecules.

Based on these findings, which student is correct? Choose TWO correct answers.

• Student 1, because the food-coloring molecules were found in the pink solution

• Student 1, because the state of matter changed when the food coloring was added

• Student 2, because no new substance was formed when there was a color change

• Student 2, because the red food coloring caused the water to change to a pink color

• Student 2, because there is no evidence of a chemical change

Multiple Select

Students are baking a cake. They mix together all the necessary ingredients and pour them into a pan. Then they place the pan into the oven to cook for 40 minutes.

Which TWO statements BEST explain why baking a cake is evidence of a chemical reaction?

• The state of matter of some of the ingredients changed while being cooked.

• The total mass of the ingredients was the same before and after they were cooked.

• The temperature of the ingredients increased as they absorbed thermal energy from the oven.

• The ingredients formed a new substance after they were cooked in the oven.

• The cake can no longer be separated into its individual ingredients.

Multiple Select

A group of students investigates the reaction that occurs when sugar is heated and breaks down into water and carbon. They construct the model in the image to help them visualize the reaction.

What are examples of elements and compounds in the chemical formula shown? Select all that apply.

• Carbon is an element because it cannot be broken down into any other substance.

• Water is a compound because it cannot be broken down into any other substance

• Glucose is an element because it contains one or more elements

• Glucose is a compound because it contains one or more elements

• Carbon is a compound because it cannot be broken down into any other substance

Dropdown

A model of an element would have ​

Select answer

, while model of a compound would have ​

Select answer

. Mixtures differ from elements and compounds because the components in a mixture are not ​

Select answer

. However, some mixtures have a uniform composition and appearance, this type of mixture is classified as a ​

Select answer

Multiple Choice

When people exercise, a chemical reaction occurs in the body. Cells conduct a reaction to break down sugar and use oxygen to generate energy. This reaction is shown in the following chemical equation: Which is true of the equation?

• The number of atoms is more in the products than the reactants because energy is released in the products.

• The number of atoms is less in the products than the reactants because energy is produced in the products.

• The number of atoms is the same in the reactants and the products; the atoms simply rearrange to form a new substance.

• The number of atoms is less in the products than the reactants because energy is absorbed in the reaction.