Answer: Physical change
Explanation: Quite simple as the starfish opening a clam would mean the starfish is physically changing the clams look.
Answer:
The period 4 alkaline-earth metal has the name Calcium. An isotope of this element having 20 neutrons has a mass number of 40.
Explanation:
Looking at the periodic table 4th row for the alkaline-earth metal, we can find Calcium which has an atomic number of 20 (or protons number, or z). The mass number is given by the sum of protons and neutrons. If the number of protons in this case is 20 and the number of neutrons is also 20, the mass number A = 40.
The question is located at the end of the page or it is located below the section "with a reference point".
<h3>What is a reference point?</h3>
As explained in the text, this is a known point or location used to describe the location of an object.
<h3>What is a reference point if you want to describe the location of the question on the page?</h3>
In this case, some of the reference points you can use include the other sections in the page or the page itself.
Based on this, two possible locations are:
- The question is located at the end of the page (It uses the page as a reference point).
- The question is located below the section "with a reference point" (it uses a section as a reference point).
Learn more about location in: brainly.com/question/13376711
The answer is 0.841 g AgCl
The balanced chemical reaction would be
<span>pcl3(g) + cl2(g) = pcl5(g)
First, we need to determine the theoretical yield of the reaction assuming that all of the limiting reactant is used up. Then, we divide the actual yield to the theoretical yield to determine the percent yield.
Theoretical yield = 61.3 g Cl2 ( 1 mol / 70.9 g) ( 1 mol PCl5 / 1 mol Cl2 ) ( 208.2 g / 1 mol ) = 180.01 g PCl5
Percent yield = 119.3 g / 180.01 g x100 = 66.3%</span>
