Tuesday
July 22, 2014

Posts by BT


Total # Posts: 16

math
three numbers are in the ratio 6:3:1, and the sum of these numbers is 420. If the first number is reduced by 50%, the second number is increased by 42, and the sum of the numbers remains the same, find the resulting ratio of the numbers.

chem
how many moles of calcium and chloride ions are there in 1.00mol of cacl2

chemistry
Which ions are spectacular ions in this reaction? What is a net ionic equation for this reaction?

chemistry
What is a complete ionic equation for the reaction between Pb(NO3)2 and NaI?

chemistry
Correction : Pb(NO3)2 2.0mL

chemistry
What is the mole ratio of the reactants in a tube containing: Pb(NO3) 22.0mL 0.5 mol NaI 16.0mL 0.5 mol

chemistry
Pb(NO3)2 6.0mL 0.5 mol NaI 12.0mL 0.5 mol What is the mole ratio between Pb(NO3)2 and NaI?

chemistry
DATA TABLE 2: SPOT TESTS OF SUPERNATANT SAMPLES FROM REACTION TUBES Substance Added Tube 1 Ppt.? Tube 2 Ppt.? Tube 3 Ppt.? Tube 4 Ppt.? Tube 5 Ppt.? Tube 6 Ppt.? Pb(NO3)2 yes yes no no no no NaI no no no yes yes yes reagent present in excess How do I identify whether or not re...

chemistry
a. What is the relative height of each of the precipitates? Assume that the tube with the least amount of precipitate has a relative height of 1. HINT: Divide each height by the smallest one. b. What is the relative number of theoretical moles of product in each tube? Assume t...

chemistry
DATA TABLE 1: DATA FOR REACTION MIXTURES Tube Number Pb(NO3)2 NaI Height Ppt. (cm) Maximum Theoretical Yield Ppt. (mol) (mL) (mol) (mL) (mol) 1 2.0 0.5 16.0 0.5 0.6 2 4.0 0.5 14.0 0.5 1.3 3 6.0 0.5 12.0 0.5 1.8 4 8.0 0.5 10.0 0.5 1.5 5 10.0 0.5 8.0 0.5 1.7 6 12.0 0.5 6.0 0.5 0...

trig
What is the projection of (2,6) onto (-1,5)?

trig
Given the polar coordinates of a point, how do I find the rectangular coordinates? (2, 3pi/4) (-4, 7pi/6) (2/3, -2pi/3) Given the rectangular coordinates of a point, how do I find the polar coordinates? (4, 0) (3, 4) (2, -2)

trig
I don't understand the question... (This homework question was removed due to a copyright claim submitted by k12.com.)

chemistry
A 0.500 L solution of 7.50 M hydrochloric acid is used to neutralize a 250.0 g sample of calcium hydroxide. Calcium chloride – a chemical used to control highway dust, strengthen concrete mixes, and add flavor to foods – is produced by the reaction. 2 HCl + Ca(OH)2 &...

Physics
A turtle is moving with a constant acceleration along a straight ditch. He starts his stopwatch as he passes a fence post and notes that it takes him 10s to reach a pine tree 10 m farther along the ditch., As he passes the pine tree, his speed is 1.2m/s. How far was he from th...

science
induced emf in secondary= (number of turns in secondary/ number of turns in promary)* applied emf in primary. this can be changes to solve for applied emf in primary instead.

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