The observation that most likely indicates that only a chemical change has taken place is "A reaction occurs." This is because a chemical change typically involves the formation of new substances, accompanied by a reaction, while the other options may be associated with either physical or chemical changes.
Which observation most likely indicates that only a chemical change has taken place?(1 point) Responses The change cannot be reversed. The change cannot be reversed. States of matter changes. States of matter changes. The shape changes. The shape changes. A reaction occurs.
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Use the table of observed changes to answer the question. Change # Reacts with another substance? Temperature change? Gas, sound, or light produced? New substance formed? 1 yes yes yes yes 2 no yes yes no 3 yes yes yes yes 4 no no no no Which changes shown in the table are physical changes? (1 point) Responses 2 and 4 2 and 4 1 and 4 1 and 4 1 and 2 1 and 2 2 and 3
Based on the information provided in the table, the changes that are physical changes should not involve a reaction with another substance, the formation of a new substance, and generally do not result in a significant temperature change, gas, sound, or light being produced.
In the table:
- Change #1: Reacts, temperature change, gas/light produced, new substance formed (chemical change)
- Change #2: Does not react, temperature change, gas/light produced, no new substance (possible physical change, but the gas/light produced could indicate a chemical change)
- Change #3: Reacts, temperature change, gas/light produced, new substance formed (chemical change)
- Change #4: Does not react, no temperature change, no gas/light produced, no new substance (physical change)
Based on this analysis, the changes that are physical changes are 2 and 4.
So, the correct response is 2 and 4.
Why is it a physical change to freeze water?(1 point) Responses The new and original substances are different. The new and original substances are different. Only a phase change occurs. Only a phase change occurs. Heat is released during the process. Heat is released during the process. A temperature change occurs.
The correct response to why freezing water is considered a physical change is "Only a phase change occurs."
When water freezes, it changes from a liquid to a solid (ice), but the chemical composition of the substance remains the same (H₂O). This is characteristic of a physical change, as only the state of the matter changes without altering its chemical identity.
Which option is an example of a chemical change?(1 point) Responses folding paper folding paper stretching a rubber band stretching a rubber band burning wood burning wood chopping vegetables
The option that is an example of a chemical change is burning wood.
When wood burns, it undergoes a chemical reaction that produces new substances, such as ash, smoke, and gases. In contrast, folding paper, stretching a rubber band, and chopping vegetables are all physical changes, as they do not create new substances.
Prior to the destruction of the Second Temple, which of the following areas of the world contained Diaspora communities? (1 point) Responses Central Asia Central Asia Great Britain Great Britain Japan Japan Southern Africa
Prior to the destruction of the Second Temple in 70 CE, the areas of the world that contained Diaspora communities primarily included Central Asia and parts of the Mediterranean world, including areas like Egypt and parts of the Roman Empire.
While there were Jewish communities in various regions, the most historically referenced Diaspora communities during that time are typically found in regions such as:
- Central Asia (including areas that are part of modern Kazakhstan and surrounding regions)
- The Mediterranean regions (including present-day Greece and Italy)
However, none of the other options provided (Great Britain, Japan, Southern Africa) had significant Diaspora communities prior to this time. So, the best response based on the options given is Central Asia.
What happened to the kingdom of Israel after Solomon died? (1 point) Responses David became king. David became king. It split into two kingdoms. It split into two kingdoms. It fell and the Babylonian captivity began. It fell and the Babylonian captivity began. The time of judges began. The time of judges began.
After Solomon died, the kingdom of Israel split into two kingdoms. This division occurred around 931 BCE, leading to the formation of the northern Kingdom of Israel and the southern Kingdom of Judah. So, the correct response is "It split into two kingdoms."
5 answers