An element is a pure substance that consists entirely of one __ electron proton neutron atom

In which orbitals would the valence electrons for carbon (C) be placed? sorbital and d orbitals sorbital only porbitals only sorbital and p orbitals

Q. KEY QUESTIONS 1. What changes occur to chemical bonds during a chemical reaction? 2. How does the change in energy of a chemical reaction predict whether or not the reaction will occur? 3. Explain the role of enzymes and how they affect the chemical reactions of living things.

Write net ionic equation for the reaction between nitric acid and calcium hydroxide. Express your answer as a chemical equation Identify all of the phases in your answer. $\square $ A chemical reaction does not occur for this question.

$[H_{3}O^{+}]=9.3\times 10^{-2}M$ Express your answer using two decimal places.

Use significant figures when performing calculations Question Which of the following is a rule of significant figures in calculations? Select the correct answer below: Round the result to the same number of digits as the number with the most number of significant figures. Round up if the digit to be dropped is less than 5. Round down if the digit to be dropped is less than 5. None of the above.

Write the full electron configuration for $P^{3-}$ E full electron configuration: $\square $ What is the atomic symbol for the noble gas that also has this electron configuration? atomic symbol: $\square $

Which of the following represents a chemical change? Rocks being smoothed by rapid water movement The pink color of a rose Decomposition of stone due to acid rain

Asbestos is made from minerals. CHOOSE AN OPTION BELOW True False

To prepare aluminum for welding, it should be cleaned with an approved chemical such as MEK. rose oil. acetone. hydrofluoric acid.

Type the correct answer in each box. Which chemical symbols will complete the equation for this decomposition reaction? $2KI\rightarrow 2\square +\square 2$