philipentonu895

Using Flutter Version 3.3.6 - 

My code below - I got this message which I don't understand

No MediaQuery widget ancestor found.
Scaffold widgets require a MediaQuery widget ancestor.
The specific widget that could not find a MediaQuery ancestor was:
  Scaffold
The ownership chain for the affected widget is: "Scaffold ← FoodList ← [root]"
No MediaQuery ancestor could be found starting from the context that was passed to MediaQuery.of(). This can happen because you have not added a WidgetsApp, CupertinoApp, or MaterialApp widget (those widgets introduce a MediaQuery), or it can happen if the context you use comes from a widget above those widgets.

import 'package:flutter/material.dart';
void main() {runApp(const FoodList());}

class FoodList extends StatelessWidget {
const FoodList({super.key});

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("Food List"),
),
body: ListView(
children: const <Widget>[
ListTile(
title: Text("Food Item 1"),
trailing: Checkbox(value: false, onChanged: null),
),
ListTile(
title: Text("Food Item 2"),
trailing: Checkbox(value: false, onChanged: null),
),
ListTile(
title: Text("Food Item 3"),
trailing: Checkbox(value: false, onChanged: null),
),
ListTile(
title: Text("Food Item 4"),
trailing: Checkbox(value: false, onChanged: null),
),
ListTile(
title: Text("Food Item 5"),
trailing: Checkbox(value: false, onChanged: null),
),
ElevatedButton(
onPressed: null,
child: Text('Submit'),
)
],
),
);
}
}

Identify the reagent(s) needed to complete the following reaction scheme.

Group of answer choices HOCH2CHCH2 NaH followed by BrCH2CHCH2 H2O followed by BrCH2CHCH2 KOCH2CHCH2 H2SO4 followed by HOCH2CHCH2

1. a)Determine the order for the reaction of
phenolphthalein and sodium hydroxide.

b)What solvent should you use to calibrate
the spectrometer?

c)What wavelength is best for the analysis
of phenolphthalein?

Follow the instructions

Be Pacific

Assignment 9 - Defining Challenge Discussion 

Identify the carbon atom(s) with sp hybridization in the carbon skeleton structure of capillin below by clicking on each one. 

What is RA 9163 and RA 11476 all about?