A placebo is a substance that is unlikely to affect the dependent variable.

a. True

b. False

What is the maximum mass of ethyl alcohol you could boil with 1000 j of heat, starting from 22 ∘c?

How many moles are in 15.0 g of copper (ii) sulfate?

Complete el crucigrama sobre conceptos del agua. Horizontal 1. Cuando aumentano disminuyen el agua cambla de estado. 5. Ejemplos: hielo, nieve, granizo. 7. Contiene poca o muy poca sal. 8. Ejemplo: Vapor que sale de las aguas termales. 13.

onsider the reversible dissolution of lead (II) chloride. P b C l 2 (s) - ⇀ ↽ - P b 2 + (a q) + 2 C l - (a q) PbClX2 (s) ↽--⇀PbX2 + (aq) + 2ClX - (aq) Suppose you add 0.2393 g of P b C l 2 (s) PbClX2 (s) to 50.0 mL of water.

Mg3 (Si2O5) 2 (OH) 2 There are. 0893 moles of magnesium how many moles of silicon are there in the sample?

Identify the element that chlorine forms a covalent bond with

A child pulls a sled up a snow-covered hill. The child does 405 J of work on the sled. If the child walks 15 m up the hill, how large of a force must the child exert?

A piece of glass with a mass of 32.50 g specific heat of 0.840 J/g*°C and an initial temperature of 115 °C was dropped into a calorimeter containing 57 g of water (specific heat 4.184 J/g*°C).

Which of the following is the most likely description of the product or products of a double-displacement reaction? A) one new compound B) two new compounds C) oxygen and energy D) one new compound and an element

A balloon is filled with 12L of air at a pressure of 2 atm. What is the volume of ballon if the pressure is changed to 3 atm?