Answer:
Take about 2g barium hydroxide in a test tube. Add 1 g of ammonium chloride and mix with the help of a glass rod. Touch the bottom of the test tube with your palm. What do you feel? Is this an exothermic or endothermic reaction?
Answer:
<h2>1.93 × 10²⁴ atoms</h2>
Explanation:
The number of atoms in a substance can be found by using the formula
<h3>N = n × L</h3>
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 3.21 × 6.02 × 10²³
We have the final answer as
<h3>1.93 × 10²⁴ atoms</h3>
Hope this helps you
Answer:
Bases
Explanation:
Most soaps fall under the base category as they are slippery and will taste bitter if you taste it (DONT TRY IT THO).
Answer: A. It can be found on the periodic table. E. It is made of only one type of atom.
Explanation: Element is the pure substance which is made up of similar atoms and cannot be separated into its components. Example : Al
Compound is the pure substance which is made up by combination of two or more elements in a fixed ratio by mass. Example : 
A) Every element can be found on the periodic table.
B) Element can be a solid, liquid or a gas.
C) Elements can be separated into different components as it is made up of only single type of atoms.
D) Only solids have fixed shape and volume.
E) Elements are made up of only one type of atoms.
Answer:
25 mL of the 10% solution.
Explanation:
<em>Clayton will mix x milliliters of a 10%, percent by mass saline solution with y milliliters of a 20%, percent by mass saline solution in order to create an 18%, percent by mass saline solution.</em> This can be described with the following equation:
0.1 x + 0.2 y = 0.18 (x + y) [1]
<em>If Clayton uses 100 milliliters of the 20%, percent by mass saline solution, how many milliliters of the 10%, percent by mass saline solution must he use?</em>
If y = 100 mL, what should be the value of x?
Let's solve [1] for "x" and replace with the value of "y".
0.1 x + 0.2 y = 0.18 (x + y)
0.1 x + 0.2 y = 0.18 x + 0.18 y
0.02 y = 0.08 x
x = 0.25 y = 0.25 × 100 mL = 25 mL
