CHEMISTRY HIGH SCHOOL

Ammonia reacts with hypobromite, obr, by the reaction 2nh3 3obr n n2 3br 3h2o. what is the molarity of a hypobromite solution if 1.00 ml of the obr solution reacts with 1.69 mg of nh3

Answers

Answer 1
Answer:

The balanced chemical equation representing the reaction of ammonia with hypobromite is:

N_{2}(g)+3Br^{-}(aq)+3H_{2}O(l)" alt="2NH_{3} (g)+3OBr^{-}(aq)-->N_{2}(g)+3Br^{-}(aq)+3H_{2}O(l)" align="absmiddle" class="latex-formula">

The mass of =1.69mg

Moles of =

Calculating the moles hypobromite that would react with :

Volume of hypobromite required for titration = 1.00 mL

Molarity of hypobromite solution =


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What was the significance to India of the Persian conquest of the Indus Valley and Kashmir under Emperor Darius in the sixth century B.C.E.?

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Answer:

India had a greater contact and net work with other areas or territory.

Explanation:

This lead to the introduction of new ideas and they also learnt new techniques.

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What would you need to do to calculate the molality of 0.2 kg of NaCl in 3 kg of water?

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Answer:

1.14mol/kg

Explanation:

Mass of solute = 0.2kg

Mass of solvent = 3kg

Molality = no. Of moles / kg of solvent.

0.2 kg of NaCl = x moles

No. Of moles = mass / molarmass.

Molar mass of Na = 23

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Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

0.2kg = 0.2 × 1000g = 200g.

No. Of moles = 200 / 58.5

No. Of moles = 3.419moles.

Molality = no. Of moles / kg of solvent.

Molality = 3.419 / 3.0

Molality = 1.139 mol/kg = 1.14mol / kg

convert the .2 kg of NaCl to moles of NaCl. hope this helps
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How is the metals found in the planets crust helpful to medical practices and procedures?

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If we were to find different materials in the earth, some of them might cure infections or cancer or other harmful things that may harm us. 
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Explain how calcium, ca2+, and phosphate,po43−, can make a compound with electroneutrality

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Calcium, a group 2 element, naturally loses two electrons in order to become electronically stable. PO43- naturally gains 3 electrons to become more electronically stable. In order to bond with electroneutrality, it is necessary for the ions to bond to create a molecule with 3 Ca2+ ions and 2 PO43- ions, since 3 Calcium ions have a charge of 6+ and 2 phosphate ions have a net charge of 6-. This creates a molecular net charge of 0.
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One tablespoon of peanut butter has a mass of 17.0 g. it is combusted in a calorimeter whose heat capacity is 110 kj/°c. the temperature of the calorimeter rises from 21.2 âc to 24.4 âc . what is the caloric content of peanut butter in cal/g?

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If the calorimeter whose heat capacity is 110 kJ/°C rises its temperature from 21.2°C to 24.4°C, the heat transmited to it is: 110 kJ/°C * (24.4°C - 21.2°C) = 110kJ/°C (3.2°C) = 352 kJ.

That heat is generated by the combustion of 17.0 g of peanut butter, so the caloric content of it is: 352kJ / 17.0 g = 20.705 kJ/g.

Now use the conversion from kJ to cal:

1 cal = 4.184 J

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Determine the mass percent of each of the elements in the fungicide copper(ii) oleate, cu(c18h33o2)2.

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The mass percent is determined by the formula:

mass percent =    -(1)

Given compound is copper(II) oleate,

The atomic mass of the elements present in copper(II) oleate, are:

Atomic mass of =

Atomic mass of =

Atomic mass of =

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Using formula (1), the mass percent of each element is calculated as:

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Mass percent of = %

Mass percent of = %.

  • For

Mass percent of = %

Mass percent of = %.

  • For

Mass percent of = %

Mass percent of = %.

  • For

Mass percent of = %

Mass percent of = %.

HIGH SCHOOL

HELPPPP FASTTTTT!!!!!!!!!!! BRAINLYEST! :) 2. In a car engine, energy is converted in a number of ways to make the car run. Identify the correct order of the energy conversion in the engine of the car by this path:

The ignition switch is turned, which sends a signal to start the car by fuel burning. This gets the engine going, which produces heat. When the driver puts the car in drive and pushes the accelerator, the car starts moving.

A. chemical --> mechanical --> heat --> electrical
B. electrical --> chemical --> thermal --> mechanical
C. mechanical --> electrical --> heat --> chemical
D. heat --> chemical --> electrical --> mechanical

3. When a TV is turned on, electrical energy from the wires inside the wall are transferred in many ways. Which shows the best list describing most of these conversions?

A. sound and light
B. light, sound, and heat
C. light, sound, and potential
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A. light energy from the sun
B. kinetic energy from moving from a plate to your mouth
C. chemical energy from the plants it came from
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These are three questions and three answers.


1) Question 2. In a car engine, energy is converted in a number of ways to make the car run. Identify the correct order of the energy conversion in the engine of the car by this path:


Answer: B. electrical → chemical → thermal → mechanical


Explanation:



The ignition switch is turned, which sends a signal to start the car by fuel burning.


i) Turning the ignition shwitch is an electrical signal. So, the start is an electrical energy.


ii) Fuel burning is braking the bonds of the fuel to convert them into CO₂ and H₂O. This is chemical energy (such as what your body does with the food).


So far, electrical energy has been transformed into chemical energy.


Electrical → Chemical


iii) This gets the engine going, which produces heat.


The chemical reaction produces gases and thermal energy (heat).


Then, add thermal energy from the chemical reaction to the chain:


Electrical → Chemical → Thermal


iv) Then, the gases expand and move the pistons, motion. Motion is kinetic energy which is mechanical energy.


This completes our chain:


Electrical → Chemical → Thermal → Mechanical


And that is the option B. electrical → chemical → thermal → mechanical



3. When a TV is turned on, electrical energy from the wires inside the wall are transferred in many ways. Which shows the best list describing most of these conversions?


Answer: B. light, sound, and heat


Justification:


i) light: the image that you can see from the screen, is only possible because part of the energy is converted into electromagnetic radiation with wavelength of visible ligth.


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Explanation:


The very begining is the ligth energy from the sun.


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2. B) electrical chemical thermal mechanical 
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The main function of which system is to help protect inner organs from being damaged by an outside force? * circulatory
nervous
excretory
skeletal

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The main function of the skeletal system is to help protect inner organs from being damaged by an outside force. Your bones protect your organs from any injury that may occur if you are hit or something like that.
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The solubility table helps predict the products of what kind of reactions?

Answers

Answer: Double replacement reactions

Explanation: In general, a double replacement reaction is written as:

This type of reactions takes place if an insoluble product(precipitate) is formed which could be predicted using solubility table or rules.

For example, chloride of silver ion is insoluble. So, if we mix barium chloride and silver nitrate solutions then the double replacement reaction takes place and a precipitate of silver chloride(AgCl) is formed.

Answer:

Double-replacement

Explanation:

:/

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