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What happens after an echo knight grapples using its echo?

This question occurred to me after reading this question. That question questions if the echo can make ability checks. Given the fact that a grapple is an attack, which the rules permit the echo to do, and an opposed skill check between the creature being grappled and the knight (not the echo), the question is […]

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Does the optional Overrun rule override the creature size requirements?

The standard moving through creatures spaces rules state that in order to do this, a creature must be two sizes larger than the one they want to pass through. The optional overrun rules in the DMG (chapter 9) now require a roll, but does it remove the size differential as well and completely replace the […]

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Can the Echo Knight’s Echo make Ability Checks?

In the Echo Knight subclass it states that the Echo “uses your saving throw bonus for [saving throws]”, but says nothing about being able to make skill checks with the Echo. I’m primarily concerned about skill checks like stealth and acrobatics/athletics, things you might want to make in the course of combat or while using […]

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I need help with Cahn-Ingold-Prelog (boat conformation)

It looks like a boat conformation, but since I don’t know if the hydrogen and the other atoms are pointing backward or forward, I don’t know how to solve it. Is there a specific rule when it comes to boat conformations? Thank you so much in advance! It’s drawn like this in my workbook. It […]

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Non foaming, safe to handle surfactant

I’m looking to lower the surface tension of water in some flow experiments. Does anyone have a recommendation for a “safe” surfactant that is non-foaming and will reduce the surface tension to 20 or so?

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Why does a first order reaction only depend on the concentration of a single reactant?

I am new to kinetics so please explain it from basic, If there is a reaction – $$\ce{A + B + C -> D}$$ In first order reaction rate is given by- $\mathrm R = k[\mathrm A]$ or $\mathrm R = k[\mathrm B]$ or $\mathrm R = k[\mathrm C]$ my question is why cant \$\mathrm […]

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Why does Sodium Hydrogen Sulfate (Sodium Bisulfate) produce moisture?

In my chemistry lab, I have a vial of Sodium Hydrogen Sulfate (Sodium Bisulfate). I’ve noticed that when I take a spoonful using a spatula, the spatula gets covered in many tiny droplets, and the lid of the vial always has a layer of tiny droplets on the inside. Does the Sodium Hydrogen Sulfate (Sodium […]

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Why does H+ attack alkene first in this reaction?

The reaction is: Why is the double bond attacked here even though it is in conjugation with the lone pairs of O thereby making it harder to extract. Also,don’t the 2 lone pairs on OH have more electron density than the pi bond?

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Error encountered during contract execution [Reverted] Problem with Contract

I’ve sent the transaction – https://ropsten.etherscan.io/tx/0xbecb36319d806edc3617abcbeb1f95e7215cb205dc180088f225c1addd82086f to the contract address and it got reverted. Could someone explain me why? Contract code: pragma solidity ^0.6.8; import “https://github.com/OpenZeppelin/openzeppelin-contracts/contracts/math/SafeMath.sol“; contract Waterfall { using SafeMath for uint; struct User { address payable addr; uint amount; } address payable public owner; User[] public users; uint public totalUsers = 0; uint […]

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How to disconnect MetaMask wallet using Web3modal

I am using metamask with kovan to connect to the wallet import React, { useState, useEffect} from ‘react’; import Web3 from “web3”; import Web3Modal from “web3modal”; import Navbar from ‘./components/navbar’; function App() { const providerOptions = {}; const web3Modal = new Web3Modal({ network: “mainnet”, // optional cacheProvider: true, // optional providerOptions // required }); const […]