Pure substances have a constant composition and can only be changed by what?
- Correct Answer: chemical reactions
- carbon reactions
- radiation
- growth
Explanation: Pure substances have a constant composition and can only be changed by chemical reactions. They can be classified as either elements or compounds.
More Random Questions
Q: On July 14, 2024, India and which country have agreed to work together in the field of environment and climate change?
Ans: Bhutan
Ans: Bhutan
Q: An ECG shows ST depression in leads V5-V6 in a patient with angina. Which coronary artery is most likely involved?
Ans: Left circumflex artery (LCx)
Ans: Left circumflex artery (LCx)
Q: Which city was a port for Roman trade?
Ans: Arikamedu
Ans: Arikamedu
Q: Larger molecules can have many, many of what that serve to keep the molecule together?
Ans: bonds
Ans: bonds
Q: On January 30, 2025, who has been appointed as the new CFO of Signature Global?
Ans: Sanjeev Kumar Sharma
Ans: Sanjeev Kumar Sharma
Q: How many embryonic cell layers do flatworms have?
Ans: three
Ans: three
Q: What is a symptom of a faulty fuel pump?
Ans: Engine stalling
Ans: Engine stalling
Q: What is the bright flash in the sky during a storm called?
Ans: Lightning
Ans: Lightning
Q: With whom has 'DigiLocker' partnered for seamless access on October 10, 2024?
Ans: Umang App
Ans: Umang App
Q: Who has become the Second Lady of America?
Ans: Usha Chilukuri Vance
Ans: Usha Chilukuri Vance
Q: What is the main component of air?
Ans: Nitrogen
Ans: Nitrogen
Q: Which text contains Buddha’s teachings?
Ans: Tripitaka
Ans: Tripitaka
Q: Where was the 'Indian Institute of Skills' inaugurated?
Ans: Mumbai
Ans: Mumbai
Q: What do mammals have under the skin to help insulate the body?
Ans: a layer of fat
Ans: a layer of fat
Q: What is the purpose of the brake disc in a vehicle?
Ans: Provides braking surface
Ans: Provides braking surface
