In which time Period did Copernicus introduce his heliocentric or sun centered theory

1. A. D. 1200-1400

2. A. D. 1400-1600

3. A. D. 1600-1800

4. A. D. 1800-2000

How is each item classified on the pH scale? Column A 1. baking soda: pH 9.0 2. lemon juice: pH 2.3 3. ammonia: pH 11.5 4. tomatoes: pH 4.2 5. bananas: pH 5.0 6. pure water: pH 7.0/Column B A. acid B. base C. neutral

If the percent (mass/mass) for a solute is 8% and the mass of the solution is 200 g, what is the mass of solute in solution?

An organic compound is composed of 38.7% C, 9.70% H, 51.6% O. The compound has a molecular formula mass of 62.0g/mol. What is the molecular formula of this organic compound? A) CHO B) C2H6O2 C) C4H6O4 D) C4H12O4

What would happen if the number of protons were to change in an atom

Why is nitrogen fixation such an important step in the nitrogen cycle? Question 7 options: Bacteria convert the fixed nitrogen back into N2. Soil nitrogen is different. Decomposers need to use NH4+. Plants can't use nitrogen in the form of N2.

1. Sara tells Michael she is 160 centimeters tall, while Michael says he is 60 inches tall. If there are 2.54 centimeters in an inch, who is taller

How do you tell if a compound is polar or non polar

What two ions are central to the arrhenius definitions of acids and bases?

Question 1 A process in which suthetances chemically rearrange to form new substances o Molecule Energy o Organism O Chemical reaction O Matter O Cellular respiration

What are the uses of evaporative salts?