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3 years ago

Which term describes a substance that increases the concentration of hydroxide ions in solution?

Chemistry

2 answers:

Over [174]3 years ago

6 0

Arrhenius definition of a base

steposvetlana [31]3 years ago

5 0

Arrhenius definition of a base

An Arrhenius base is a substance that increases the concentration of OH- ions when dissolved in water.

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The half life of iodine-125 is 60 days. What was the initial amount of iodine-125 if you have 4.5 grams after 360 days?

ValentinkaMS [17]

Answer:

288 grams

Explanation:

The amount of any radiative substance left after some time is calculated by

amount left = $x/2^n$

where x is the initial amount of substance

n is the number of half lives

one half live is the time in which amount of substance reduce to half of its initial value.

------------------------------------------------------

amount left = 4.5 grams

half life of iodine-125 = 60 days

total time in which substance reduced to 4.5 grams = 360 days

thus,

number of half life in 60 days = 360/60 = 6

thus, there are period of 6 half lives

in each half life the amount of substance reduces to its previous half

let the initial amount be x grams

using the formula

amount left = $x/2^n$

$4.5 = x/2^6 \\ 4.5 = x/64\\x = 4.5*64 = 288$

Thus, 288 grams was the initial amount of iodine-125

6 0

3 years ago

A student collected a 1.28 g sample of Magnesium. How many atoms of Mg are in his sample?

inessss [21]

All you haft to do is mutiply and see how many points there are

3 0

3 years ago

Explain why titrating a weak acid with a strong base produces a basic solution at the equivalence point

Ivan

A weak acid ionizes or dissociates less producing fewer positive (H+) ions than a STRONG base does because it is supposed to disassociate more fully. So when the acid and base neutralize, not all of the OH- ions are neutralized because fewer H+ were produced than OH-.

3 0

3 years ago

The diagram shows a simple model of an event that is part of the rock cycle. image Which type of event is most likely occurring

Bezzdna [24]

Answer: D. the hardening of liquid magma that leads to igneous rock

Explanation:

5 0

3 years ago

Combustion of a 0.9835-g sample of a compound containing only carbon, hydrogen, and oxygen produced 1.900 g of co2 and 1.070 g o

Colt1911 [192]

Find grams of C and H, using molar masses:
12.0 g C x (1.900 g CO2 / 44.0 g CO2) = 0.5182 grams C
2.02 g H x (1.070 g H2O /18 g H2O) = 0.1201 grams H

Since all the C and H in CO2 and H2O will come from the sample except oxygen, because we need to provide oxygen for sample to burn.

0.9835 g sample - 0.5182 g O - 0.1201 g H = 0.3452 grams O

find moles, using molar masses:
0.5182 grams C / 12.0 g/mol C = 0.0432 moles C
0.1201 grams H / 1.01 g/mol H = 0.119 moles H
0.3452 grams O / 16.0 g/mol O = 0.0216 moles O

0.0216 is lesser, so use it to normalize to find the ratio.
find ratios:
0.0432 moles C / 0.0216 = 2 moles C
0.119 moles H / 0.0216 = 5.5 moles H
0.0216 moles O / 0.0216 = 1 mole O

so, the ratio is C2 H{5.5} O1
double the ration to eliminate decimals.

gives your answer is $C_4 H_{11} O_2$

5 0

3 years ago