Which of the following is a chemical reaction?
1- Dropping a sliced orange into a vat of Sodium Dydroxide
2-Cutting a piece of paper into two pieces
3-Filling a balloon with air
4-Freezing liquid Mercury

How did Lincoln use the railroad to his advantage ? Object A has a mass of 10 kg and is moving at a velocity of 2.0m/s. So Object A's momentum is - kg. m/s. A scientist has two solutions, which she has labeled Solution A and Solution B. Each contains salt. She knows that Solution A is 35% salt and Solution B is 80%salt. She wants to obtain 90 ounces of a mixture that is 40% salt. How many ounces of each solution should she use?Solution A:Solution B: Which of the following best explains why the Democratic Party was formed in the 1820s? A spinner is divided into 8 equal sections numbered 1 to 8. About how many times would you expect the pointer to land on a number less than 6 if the pointer is spun 30 times. NEED HELP! ASAP PLEASE! Brownley Company has two service departments and two operating (production) departments. The Payroll Department services all three of the other departments in proportion to the number of employees in each. The Maintenance Department costs are allocated to the two operating departments in proportion to the floor space used by each. Listed below are the operating data for the current period: Service Depts. Production Depts. Payroll Maintenance Cutting Assembly Direct costs $ 20,400 $ 25,500 $ 76,500 $ 105,400 No. of personnel 15 15 45 Sq. ft. of space 10,000 15,000 The total cost of operating the Maintenance Department for the current period is: Create an abstract class DiscountPolicy. It should have a single abstract method computeDiscount that will return the discount for the purchase of a given number of a single item. The method has two parameters, count and itemCost. 2. Derive a class BulkDiscount from DiscountPolicy, as described in the previous exercise. It should have a constructor that has two parameters, minimum and percent. It should define the method computeDiscount so that if the quantity purchased of an item is more than minimum, the discount is percent percent. 3. Derive a class BuyNItemsGetOneFree from DiscountPolicy, as described in Exercise 1. The class should have a constructor that has a single parameter n. In addition, the class should define the method computeDiscount so that every nth item is free. For example, the following table gives the discount for the purchase of various counts of an item that costs $10, when n is 3: count 1 2 3 4 5 6 7 Discount 0 0 10 10 10 20 20 4. Derive a class CombinedDiscount from DiscountPolicy, as described in Exercise 1. It should have a constructor that has two parameters of type DiscountPolicy. It should define the method computeDiscount to return the maximum value returned by computeDiscount for each of its two private discount policies. The two discount policies are described in Exercises 2 and 3. 5. Define DiscountPolicy as an interface instead of the abstract class described in Exercise 1. A wire is cut into four pieces of different lengths. Each piece is stretched between two supports to the same tightness. Which of the pieces, shown below, would give the highest pitch if it were plucked in the middle What was Emerson's view of the Unitarian religion?O A. He was a Unitarian minister all his life.B. He was a firm believer.C. He was a skeptic and left the Unitarian ministry as a young man.D. He was a confirmed atheist. Maria est en el piso 6 y quiere ir al stano 2. Cuantos pisos bajar? a rectangle has an area of 24m. its length is 5m longer than the width.write an expression for the rectangle's length find the volume, help please all numbers are in inches, will mark brainleist Which of the following is the best definition of the term bias What happens to the parabola when a I need this answer please tell me the answer What is the purpose behind the system of checks and balances? Tate is paid $17.35 per hour with time and a half overtime. What will his gross pay period in which he worked 35 hours one week and 44 hours next week for a total 79 hours? Read the excerpts from Take the Tortillas Out of Your Poetry and Speaking Arabic.My friend had concluded that if he took his language and culture out of his poetry, he stood a better chance of receiving a fellowship. He took out his native language, the poetic patois of our reality, the rich mixture of Spanish, English, pachuco and street talk which we know so well. In other words, he took the tortillas out of his poetry, which is to say he took the soul out of his poetry.At a neighborhood fair in Texas, somewhere between the German Oom-pah Sausage Stand and the Mexican Gorditas booth, I overheard a young man say to his friend, I wish I had a heritage. Sometimes I feelso lonely for one. And the tall American trees were dangling their thick branches right down over his head.Which best states how the structure of each excerpt supports a different tone?A) - Anaya structures his text as an anecdote, which gives it a humorous tone, while Nye structures her text as a counterclaim, which gives it a defensive tone.B) - Anaya structures his text as an explanation, which gives it an authoritative tone, while Nye structures her text as an impression, which gives it a soothing tone.C) - Anaya structures his text as a theory, which gives it an academic tone, while Nye structures her text as a list, which gives it an unemotional tone.D) - Anaya structures his text as a news report, which gives it a neutral tone, while Nye structures her text as a critique, which gives it a judgmental tone.THE ANSWER IS B) - CORRECT ON EDG 2020 If you flipped a fair coin 18 times about how many times would you expect heads to appear?