HELP ASAP!! An experiment is performed in which a crystalline substance is added to a beaker filled with room-temperature water. The following observations were made:
1. The crystals dissolve.
2. A precipitate forms.
3. The bottom of the beaker feels warm to the touch.
4. Bubbles begin to form in the water.
Which observations are evidence that a chemical reaction took place?

What contain a nucleus and pseudopods?(false foot)? The energy of Bohr orbits in a H atom varies as n (the orbit number). n2. 1/n. 1/n2. n/(6.02 x 1023). There are _____ naturally occurring elements. A. 57B. 108C. 95D. 92E. 87 in cell e2, calculate the present value of an auto loan that has a $450.00 payment, 5.25% annual interest rate, and a 4-year repayment period. the function should return a positive number. How do emotions influence success and well-being? what happens when the eustachian tube shuts off? ?That is how you write the answer. A circular arc of length 9 feet subtends a central angle of 65 degrees. Find the radiusof the circle in feet. a slider (mass m) is released from rest at position 1 on a frictionless rod at position 1, where the attached spring is at its free/unstretched length. the slider comes to rest at position 2, where the spring is not fully compressed. choose all statements which are true. the spring has potential energy at position 1. the spring has potential energy at position 2. gravitational potential energy at 1 is greater than at 2. the spring potential energy at 2 is negative because the spring is compressed. the spring potential energy at 2 equals the change in the gravitational potential energy between 1 and 2. Where would a dentist inject lidocaine to prevent pain in the lower teeth?The temporomandibular jointThe mandibular condyleThe mental foraminaThe mandibular foramen 17. Who was the author of the first methods book in the discipline of sociology? a. Emile Durkheim b. Harriet Martineau c. Jane Addams d. Max Weber rationalizing that one's family is no different from most others when drug abuse exists in one's family is a reflection of . Male 16 15 2 33Female 14 11 18 43Total 30 26 20 76If one student is chosen at random,Find the probability that the student was female: Find the probability that the student was female AND got a "C": Find the probability that the student was female OR got a "C": If one student is chosen at random, find the probability that the student was female GIVEN they got a 'C': PLEASEEEE HELP MEMEMEMEM PLESSEEE I WILL GIVE U BRAINLIST QUICK cells unicellular unicellular unicellular; some colonial multicellular multicellular multicellular which of the following sets of data provides evidence that best supports common ancestry for organisms in all three domains? responses there are autotrophic and heterotrophic organisms found in bacteria, archaea, and eukarya. there are autotrophic and heterotrophic organisms found in bacteria, archaea, and eukarya. there is a progression of pathways in organisms found in bacteria, archaea, and eukarya. there is a progression of pathways in organisms found in bacteria, archaea, and eukarya. organisms in bacteria, archaea, and eukarya each have adenine, thymine, guanine, and cytosine bases forming their dna . organisms in bacteria, archaea, and eukarya each have adenine, thymine, guanine, and cytosine bases forming their d n a . there is a progression of cellular organization in organisms found in bacteria, archaea, and eu How do characteristics of the planets,moons, and smaller objects in the solar system compare? Stephen wants to write about one of many recent family experiences for a narrative essay, but he's not sure which one to choose. What can Stephen do to help him decide upon a working topic? a. He can put slips of paper with topics on them into a hot and write about the first one he pulls out. b. He can begin by asking questions about each experience to determine which one impacted him more than the others. A ship leaves port travelling at 32 travels for 5 nauticalmiles, then changes course counterclockwise by 32 and travels foranother 10 nautical miles. Using the law of sines or cosines, howfar away is the vessel from the port once it reaches the end of thejourney? Round to 2 decimal places. how can interest rate on loan for rental property determine the rent A car is 200 km from its destination after 1 hour and 80 km from its destination after 3 hours.