Show the reaction sequences that explain these transformations

Given the pH of 7. Explain how many hydroxide ions (-OH) and hydronium ions (H30+) are present in the solution.

irga5000 [103]

If the pH is 7, the solution is neutral, which means that it is an equal amount of acid and base.

6 0

3 years ago

A scientist notices that a lump of niobium is warm to the touch and wonders if nuclear reactions are taking place in the metal.

sertanlavr [38]

Answer is: Check for the presence of alpha, beta, and gamma particles.

1) Alpha particle is nucleus of a helium-4 atom, which is made of two protons and two neutrons.

Alpha decay is radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and transforms into an atom with an atomic number that is reduced by two and mass number that is reduced by four.

2) Beta decay is radioactive decay in which a beta ray and a neutrino are emitted from an atomic nucleus.

There are two types of beta decay: beta minus and beta plus.

3) During gamma emission the nucleus emits radiation without changing its composition.

5 0

4 years ago

Read 2 more answers

1. What are the products of most combustion reactions?

valina [46]

1.Products of most combustion reactions are:
Carbon dioxide and water
2.Alloys are made by melting and combining metals together.
Chemical changes involve electrons,in this process no electron is used/shared or given.
Thus,its not a chemical change.

5 0

3 years ago

The half-life for the second-order decomposition of HI is 15.4 s when the initial concentration of HI is 0.67 M. What is the rat

larisa [96]

Answer:

The correct answer is option C.

Explanation:

Half life for second order kinetics is given by:

$t_{\frac{1}{2}=\frac{1}{k\times A_0}$

$t_{\frac{1}{2}$ = half life = 15.4 s

k = rate constant =?

$A_0$ = initial concentration = 0.67 M

$15.4 s=\frac{1}{k\times 0.67 M}$

$k=\frac{1}{15.4 s\times 0.67 M}=0.09692 M^{-1} s^{-1}=9.69\times 10^{-2}M^{-1} s^{-1}\approx 9.7\times 10^{-2} M^{-1} s^{-1}$

$9.7\times 10^{-2} M^{-1} s^{-1}$ is the rate constant for this reaction.

4 0

3 years ago

When a potassium ion (K+) moves from the soil into the vacuole of a cell on the surface of a root, it must pass through several

insens350 [35]

<h3><u>Answer;</u></h3>

C) primary cell wall → plasma membrane → cytoplasm → vacuole

<h3><u>Explanation;</u></h3>

The cell wall is the protective outer layer of a plant cell, that gives the cell strength and structure, and also filters molecules that pass in and out of the cell.
Cell membrane acts as a semi-permeable barrier separating the inside of the cell from the outside of the cell. The membrane allows regulation of what enters/exits the cell and how quickly.
Cytoplasm is the jelly-like fluid that fills a cell. It is responsible for giving a cell its shape and also helps to fill out the cell and keeps organelles in their place.
Vacuoles are membrane-bound sacs within the cytoplasm of a cell that function in several different ways. They functional in providing structural support, as well as serving functions such as storage, waste disposal, protection, and growth.
<u>Potassium ion from the extracellular environment will move to the cell vacuole via the cell wall, the cell membrane and then via the cytoplasm to the vacuole.</u>

4 0

3 years ago