Two solid blocks are heated to the temperatures shown. The blocks are placed so they touch. Which diagram shows the direction heat will flow

Question

one block is labed 160 degrees celsius while the other is labeled 141 degrees celsius. An arrow labeled heat is pointing to the 160 degrees celsius block

another block is the same thing, except the arrow is pointing towards the 141 celsius

the last block is the same thing, except there is no arrow and instead there is something labeled "no heat flow"

1. block a
2. block b
3. block c

Answer 1

When two solid blocks are in contact, heat will flow from the block at a higher temperature to the block at a lower temperature. In your scenario, the block labeled 160 degrees Celsius is at a higher temperature than the block labeled 141 degrees Celsius.

Therefore, the correct diagram that shows the direction of heat flow will have an arrow pointing towards the block at 141 degrees Celsius, indicating that heat is flowing from the hotter block (160 degrees Celsius) to the cooler block (141 degrees Celsius).

This aligns with your description of:

• 2. block b: where the arrow is pointing towards the 141 degrees Celsius block.

So the correct answer is block b.

Answer 2

Two friends bought phones that cost different amounts but had identical batteries. After using the phones for a while, both friends had to turn them off to let the batteries cool. This table shows how the temperature of each battery changed over 5 minutes.

Battery | initial temperature (celsius) | final temperature celsius
battery in the more expensive phone: 33 25
battery in the less expensive phone: 33 23

during this time, thermal energy was transferred from ____ to ____

the surroundings
each battery

Answer 3

During the time the batteries were cooling down, thermal energy was transferred from each battery to the surroundings.

The temperature of both batteries decreased, indicating that they were losing thermal energy to the environment. Specifically, the more expensive phone’s battery cooled from 33°C to 25°C, while the less expensive phone's battery cooled from 33°C to 23°C. In both cases, the heat energy was lost to the surroundings, resulting in a drop in temperature for each battery.

Answer 4

Which of the following is a physical property of matter?

Ability to rust
Ability to burn
Ability to conduct electricity
Ability to react with water

Answer 5

The ability to conduct electricity is a physical property of matter.

In contrast, the ability to rust, the ability to burn, and the ability to react with water are all chemical properties, as they describe how a substance interacts with other substances and undergoes chemical changes. Physical properties, on the other hand, can be observed or measured without changing the substance's chemical identity.

Answer 6

The chemical reaction that produces soap is called saponification. During one type of saponification, oil and sodium hydroxide undergo a chemical change to produce glycerol and soap. As a result of this reaction, the soap has different properties than the oil and sodium hydroxide. Some of these properties are what give soap its cleaning ability. For each statement below, choose whether it is true or false.

A chemical change occurs during saponification true or false

soap is a reactant of the saponification reaction true or false

Together, the products of a chemical reaction have the same arrangement of atoms as the reactants true or false

Answer 7

Here are the answers to each statement regarding saponification:

1. A chemical change occurs during saponification: True

   • Saponification is a chemical reaction that transforms oils and sodium hydroxide into soap and glycerol, indicating a chemical change.

2. Soap is a reactant of the saponification reaction: False

   • Soap is a product of the saponification reaction, not a reactant.

3. Together, the products of a chemical reaction have the same arrangement of atoms as the reactants: False

   • In a chemical reaction, the atoms are rearranged to form new products. The arrangement of atoms in the products is different from that in the reactants.

So, the true-false responses are:

1. True
2. False
3. False

Answer 8

What happens to the pH of a solution when it becomes more acidic?

the pH increases.

the pH decreases

the pH remains the same

the pH becomes neutral

Answer 9

When a solution becomes more acidic, the pH decreases.

The pH scale ranges from 0 to 14, with lower pH values (below 7) indicating more acidic solutions. Increasing acidity corresponds to a decrease in pH.

Answer 10

What is the significance of atoms in the formation of compounds?

atoms are the smallest particles of matter.

atoms determine the color of compounds

atoms provide energy to compounds

atoms combine to form compounds

Answer 11

The significance of atoms in the formation of compounds is that atoms combine to form compounds.

Atoms are the basic building blocks of matter, and when they combine in specific ways, they create compounds with distinct chemical and physical properties. This combination occurs through chemical bonds, such as covalent or ionic bonds, resulting in the formation of new substances. The other options listed (smallest particles of matter, determining color, and providing energy) are not the primary significance of atoms in compounds.