This is a good length for the summary of a short and relatively simple chapter. You may need all 1000 words for a more complex chapter. Singer's book will be about the practical applications of ethics, and this chapter is intended as a brief explanation of what ethics is and is not. In a first section, Singer explains four things that ethics is not. In the second section, he states his positive view.
Ethics has practical consequences.
Singer espouses consequentialism , which looks to goals and consequences. Ethics is independent of religion. The same argument goes to show that morality isn't simply subjective. My preference for chocolate and yours for vanilla do notconstitute an ethical disagreement. An amoral person rejects the moral point of view altogether, yet might happen to do what is right.