Определение сульфат ионов в растворе. В две пробирки налейте по 1 мл растворов серной кислоты и сульфата натрия. В каждую пробирку добавьте раствор хлорида бария. Составить уравнение реакции.

помогите друзья Write ever or never: Rose has ___ Swum in the sea. Have you ________ swum in the sea? Who are they? Finish the sentences: 1. A person who travels is a ______ . 2. A person who writes is a _______ . 3. A person who lives next door to you is a ________ . 4. A teacher is a person who ________________ . 5. A baker ___________________ . 6. A student ___________________ . Imagine you are a traveller. Think and write about a journey you have made. 1. Was your journey long or short? __________________ . 2. Where did you go? ____________________________ . 3. How did you travel? ___________________________ . 4. What did you see? ______________________________ . 5. Were you happy or sad to come home? _______________. Choose the correct verbs. Нужные слова: have,play, live, like, know. The gordons ______ in Moon Street. The children _________ a lot of hobbies. Alex _______ a lot about computers. Joe ________ the guitar. Sally _______ a cat but Joe __________ not ________ a pet. The children ___________ basketball and tennis but their parents _____ not _______ sports.

найти предел ф-ции lim x^2+2x-3/x+1   x->-1