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Chemical Engineer Interview Questions

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Indeed’s Employer Resource Library helps businesses grow and manage their workforce. With over 15,000 articles in 6 languages, we offer tactical advice, how-tos and best practices to help businesses hire and retain great employees.

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Whether you are preparing to interview a candidate or applying for a job, review our list of top Chemical Engineer interview questions and answers.

  1. Describe the difference between unit operations and unit processes. See answer
  2. Can you tell me about the material planning process? See answer
  3. How would you adjust the chemical engineering processes to improve efficiency? See answer
  4. What is some common chemical engineering equipment you need to perform your job? See answer
  5. How do you deal with conflict with other chemical engineers or professionals in the lab? See answer
  6. What would you do if a process that worked in the past started to produce engineering defects? See answer
  7. What are some important safety measures that should be in place in the labouratory environment? See answer
  8. Can you explain some of the industry best practises in place to dispose of hazardous waste? See answer
  9. How do you balance operational timelines and requirements with environmental practises? See answer
  10. What experience do you have with volatile chemical reactions or hazardous spills in the workplace? See answer
  11. How have you helped to reduce accidents in the workplace? See answer
  12. Are you comfortable working with combustible materials in the workplace? See answer
  13. What would you do if the production process changed because of new regulations, and certain chemicals were no longer allowed in the engineering process? See answer
  14. Have you ever found a use for byproducts of the production process? See answer
  15. What strengths do you bring to the chemical engineering field? See answer
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Our mission

Indeed’s Employer Resource Library helps businesses grow and manage their workforce. With over 15,000 articles in 6 languages, we offer tactical advice, how-tos and best practices to help businesses hire and retain great employees.

Read our editorial guidelines

15 Chemical Engineer Interview Questions and Answers

Describe the difference between unit operations and unit processes.

The aim of this question is to understand an individual's knowledge of the industry. Here's what to look for in an answer:

  • Chemical engineering principles
  • Ability to explain concepts and processes
  • Examples of how these processes work

Example:

 "Unit operation involves changes that occur in processes such as evaporation or distilation. Unit processes involve chemical reactions like a need for oxidization or compound reduction."

Can you tell me about the material planning process?

This question can help provide an understanding of how the candidate selects their raw materials and the basic materials they typically need for production. Here's what to look for in an answer:

  • Understanding of material planning process
  • Calculation of raw material needed for production
  • Methods on how to correct or mitigate errors

Example:

"By understanding the production needs of the facility, I can then calculate exact raw material requirements for production. I consider production or quality errors that might occur so I can still meet those goals. This helps streamline the engineering process to create products within customer specifications while minimizing production waste."

How would you adjust the chemical engineering processes to improve efficiency?

By asking this type of question, you can determine a candidate's mindset towards continuous improvement and improving production efficiency. Here's what to look for in an answer:

  • Understanding of production efficiency theories
  • Examples of how to apply theories to manufacturing
  • Willingness to create and implement change

Example:

"I apply several lean manufacturing theories to improve production timelines while increasing the company's bottom line. In the past, this has helped increase production output while minimizing production waste. I'm always looking for ways to improve efficiency and reduce wastage, and can apply my critical thinking skills to come up with creative solutions to challenges."

What is some common chemical engineering equipment you need to perform your job?

Equipment requirements can vary across different engineering specialties. Asking this question can show an individual's knowledge surrounding basic chemical engineering equipment. It can also reveal their experience using this equipment during their education and in their work experience. Here's what to look for in an answer:

  • Knowledge of various chemical engineering equipment
  • Understanding of how common equipment functions
  • Familiarity with industry trends

Example:

"In my previous positions, I used various separators to keep chemicals from reacting to each other. I also regularly used absorbers to analyse different chemical gases."

How do you deal with conflict with other chemical engineers or professionals in the lab?

Asking this type of question can demonstrate their interpersonal skills and ability to handle conflict, this can also show their willingness to share their ideas and projects. Here's what to look for in an answer:

  • Willingness to collabourate with others
  • Ability to handle and resolve conflict
  • Interest in fostering professional relationships

Example:

"Even though I spend a lot of time in the lab, I enjoy reaching out to my colleagues to get their opinions and thoughts surrounding our ongoing projects. I've found that an outside perspective can help discover solutions, and I also enjoy the interaction with my colleagues."

What would you do if a process that worked in the past started to produce engineering defects?

This question can help identify an individual's ability to resolve issues that arise in the lab and create solutions to resume production. Here's what to look for in an answer:

  • Root cause analysis
  • Able to research new techniques and methods
  • Problem-solving skills

Example:

"The first thing I'd look for in any potential changes is in the process or equipment used in the engineering process. Then, I'd research other impacting factors to help resolve the problem, or I'd find an alternative method to achieve results. I'm dedicated to producing quality work and know there's always a solution, so I'm happy to think creatively to develop solutions."

What are some important safety measures that should be in place in the labouratory environment?

This question can help an interviewer get some insight into the individual's safety orientation because chemical engineers often work with reactive and potentially dangerous chemicals. Here's what to look for in an answer:

  • Knowledge of safety procedures
  • Mention of popular methods to mitigate safety risks
  • Familiarity with emergency procedures

Example:

"Because I work with many reactive chemicals, I make sure to research and keep up to date on all safety protocols. I also inspect all of my safety gear before working with dangerous chemicals and am always prepared in case a safety incident occurs. I ensure my colleagues are familiar with our safety procedures when we begin a new project or task so we can follow safety guidelines and keep each other safe."

Can you explain some of the industry best practises in place to dispose of hazardous waste?

Chemical engineering processes can often result in hazardous waste, and this question can help establish an individual's familiarity with safe methods to dispose of hazardous waste. This can also reveal a lot about their practical experience. Here's what to look for in an answer:

  • Understanding of how to identify hazardous waste
  • Knowledge of safety disposal methods
  • Familiarity with emergency procedures

Example:

"Many of the chemical engineering processes I conduct result in hazardous waste. One way I make sure to dispose of hazardous waste properly is to stay current with proper disposal methods and conducting regular audits of all hazardous waste disposal locations."

How do you balance operational timelines and requirements with environmental practises?

Time management is an essential skill for many professionals. By asking this question, you can determine how that individual manages their time and deadlines and stays in compliance with environmental practises. Here's what to look for in an answer:

  • Time management skills
  • Knowledge of environmental practises
  • Ability to adapt and think critically

Example:

"I have found that adapting and managing my time helps me to stay within project deadlines and also gives me time to ensure that all of my projects comply with all environmental regulations. In one instance, the deadline for production was shorter than expected. So, I closely monitored the production process and immediately resolved any arising environmental or production issues. This resulted in actually completing the project a few hours ahead of schedule."

What experience do you have with volatile chemical reactions or hazardous spills in the workplace?

This question can help you gain an understanding of how a candidate reacts to unexpected emergencies and how aware they are of emergency procedures. Here's what to look for in an answer:

  • Knowledge of emergency procedures
  • Ability to react appropriately under pressure
  • Emergency prevention strategies

Example:

"One way I prevent emergencies from happening is to ensure that I handle all chemicals and complete processes according to established procedures. There was one instance in which an unexpected hazardous spill occurred in the lab. I first secured my workstation to prevent additional spills, then I followed the established hazardous spill procedures to clean the spill safely."

How have you helped to reduce accidents in the workplace?

This type of question can show an individual's familiarity with discovering and mitigating risk in the lab environment. Here's what to look for in an answer:

  • Root cause analysis
  • Critical thinking and problem-solving abilities
  • Examples of risk management

Example:

"Everyone in the lab should take part in identifying risks and finding ways to prevent accidents from occurring. I have helped to discover a few storage procedures and engineering processes that could have potentially caused accidents in the workplace and created new processes to help mitigate the risk. I'm committed to fostering a safe work environment for the whole team."

Are you comfortable working with combustible materials in the workplace?

This question can show an individual's experience with combustible materials and how to handle these types of materials. Here's what to look for in an answer:

  • Knowledge of combustible materials
  • Combustible material handling experience
  • Willingness to learn and adapt

Example:

"I have worked with many materials in my chemical engineering experience and have had the opportunity to work with combustible materials before. Even though I have not worked with these materials recently, I am willing to learn new methods on how to handle and work with these types of materials again."

What would you do if the production process changed because of new regulations, and certain chemicals were no longer allowed in the engineering process?

This type of question can show an individual's willingness to change and adapt to new processes and regulations. It can also demonstrate their chemical engineering knowledge. Here's what to look for in an answer:

  • Adaptability
  • Ability to research new methods
  • Problem-solving

Example:

"First, I would research the specific change in the regulation to see if it established new methods or procedures. Then I would research ways to replace or create new processes that maintain the level of success we had with the previous chemicals. Lastly, I would implement and educate the lab staff on the new processes and regulations changes to maintain regulatory compliance."

Have you ever found a use for byproducts of the production process?

The aim of this question is the gauge an individual's ability to problem-solve and discover ways to minimize company waste and loss. Here's what to look for in an answer:

  • Creative problem-solving
  • Continuous improvement mindset
  • Ability to create new processes and methods

Example:

"I always try to find new ways to minimize the waste created by chemical engineering processes. Although I haven't created new products from engineering byproducts, I have implemented new procedures that drastically minimize the byproducts created. This ultimately helped speed up production and increased the company's bottom line."

What strengths do you bring to the chemical engineering field?

This type of question can help show an interviewer what that individual can bring to the company. This can also allow them to establish their knowledge and experience in the chemical engineering field. Here's what to look for in an answer:

  • Example of chemical engineering skills
  • Enthusiasm for the role
  • Specific examples of top strengths

Example:

"My top strength would be my ability to research and implement new chemical engineering processes. This helps to speed up project timelines and ensure that all engineering processes comply with established regulations. One instance where my research skills benefited the company was where we had to implement a new engineering process immediately, and I helped to get production back in line within 24 hours."

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