solution needed to neutralize 500.0 mL of 0.30 M Ca(OH)2? 2.20 g NaOH are dissolved in-water 500 mL. 10. mL of this solution was diluted 100 mL solution C. 500 mL D. 400mL B. 250 mL hat is M of the diluted solution? .4.0 M B. 0.40 M 3. Which of the following is insoluble in water? -. Ca(HCO3)2 B. H₂S C. BaCO3 24. What is its frequency (s) of a photon that has an energy of 5.53 × 10-¹7 J? 3.59 × 10-⁹ B. 1.20 × 10-17 C. 8.35 x 1016 C. 0.10 M 25. What mass of AgCl is produced if 600 mL of 1.0 MAgNO3 and 400 mL of . 57.3 g B. 86.0 g C. 14.3 g 26. What are the spectator ions when Bal2 and K₂SO4 react in aqueous solution? A. Ba²+, 1¹- B. K¹, SO42- C. K¹, 1¹- D. 2.0 M D. Na2SO4 D. 2.78 x 108 2.0 M NaCl are reacted? D. 28.6 g D. Ba2+, SO42- 27. Which of the following electron configurations in the ground state is correct? A. Cut: [Ar] 4s²3d8 C. Cut¹: [Ar]3d¹⁰ B. Cu: [Ar] 4d¹0 D. Cu*: [Kr] 3do 28. What is the λ of light that is emitted when an excited electron in the hydrogen atom falls from n = 4 to n = 1 A. 97.2 nm B. 82.6 nm 365 x 10² nm D. 6.12 x 10-² nm

I wish i could visit a tutor during these times.  May I please get a break down for number 12. I'm stuck on this question

B. Density of Liquid 1. Obtain a sample of distilled water (any quantity of your choice) anddetermine its mass and volume. Record your data on table 3 in theexperimental report 2. Calculate the density of the water sample using equation 1. Substance  Density (g/mL) Substance  Density (g/mL) Aluminum 2.7 Lead  11.3 Brass 8.4 Zinc 7.1  Copper 8.9 Cork 0.26 Tin 7.3 Silver 10.5 Bone 1.80 Rhodium 12.4 Iron 7.9 Platinum 21.45

10 11 12 13 14 15 16 17 18 19 The particles in a gas vibrate faster than the particles in a liquid. O True O False 5.

Discuss the language demands included in the lesson on mixing substances in a 5th-grade classroom by Identifying key vocabulary terms students must know in order to master the learning objectives for the lesson based on the below standard and learning objective. Standard Conduct an investigation to determine whether the mixing of two or more substances results in new substances. Learning Objective Given a variety of substances and safety equipment in a classroom setting, students will be able to conduct an experiment to mix two or more substances and observe the results. They will be able to correctly identify whether a new substance has been formed as a result of the mixing, based on observable changes such as color change, formation of a precipitate, or change in temperature, with at least 80% accuracy.

Gasoline is composed of a variety of different liquid hydrocarbons, which do not separate as time passes. Gasoline is an example of a: A) heterogeneous mixture B) Chemical compound C) Chemical element D) Solution

Which of the following vocabulary words defines the energy due to motion?  A.Heat B.Potential Energy C.Kinetic Energy D.Temperature

Part C- Polarity Demonstration The results for the demonstration for polarity of various substances presented in the image below. Note that each vial has two liquid layers, water and oil. (Oil is a hydrocarbon chain.) Use this image to complete the following question. oil oil oil oil oil water water water water water With sodium chloride With iodine (dark purple solid) With copper With sulfur Blank (yellow solid) sulfate (light blue solid) (no solute) (colorless, ionic solid) Classify each of the compounds on display as a polar liquid, non-polar liquid, polar solid or non-polar solid. Saved Normal BIIU X2 X² - fr DI e Polar liquid: Polar solid: Non-polar liquid: Non-polar solid: MacBook Air

Part A Identify each of the labeled points (indicated with letters) or changes (indicated with two letters separated by an arrow) shown on the phase diagram. 1.00- Pressure (atm) 0.50- A 0.10- F -150 -75 75 150 Temperature ("C)

Name the following Fe(NO3)2