Answer:
Echolocation helps dolphins find food and avoid predators.
Explanation:
Dolphins have the ability to use echolocation and their normal sight to determine some information such as the distance, speed, size and structure of objects in the water around them. This information helps dolphins find food and avoid predators in their environment.
The Answer would be e: 3.2 g/L
<span>At STP : p = 1 atm and T = 273.15 K
molar mass Cl2 = 70.906 g/mol
d = molar mass x p/RT = 70.906 x 1 atm / 0.08206 x 273.15=3.16 g/L</span>
For this problem, let us first determine the total amount of the accumulation of the collection of coins and the total number of coins. Each penny values to 1. A dime is to 10, and a quarter would be 25. There are 15 pennies, 12 dimes, and 7 quarters. So the equation would be:
15 (1) + 12 (10) + 7 (25) = total amount
Let's solve.
15 + 120 + 175 = total amount
135 + 173 = total amount
308 = total amount
For the total number of coins, it goes like this:
15 + 12 + 7 = total number of coins
Solve
27 + 7 = total number of coins
34 = total number of coins
Since 100 pennies or 10 dimes or 4 quarters would equal to 1 dollar, the total amount would be 3 dollars and 8 cents or simply $3.08 with the total number of coins as 34.
To get percentage, simply divide 15 with the total number of coins which is 34 and multiply it by a 100. It will look like this:
(15/34) x 100 = percentage
solve
00.4411764 x 100 = percentage
44.11764% = percentage
let us round it off to the nearest hundredths
44.12% = percentage
The percentage of pennies in the collection would be 44.12%
Answer:
0.542M HCl
Explanation:
The reaction of H₂SO₄ with NaOH is:
H₂SO₄ + 2 NaOH → 2H₂O + Na₂SO₄
<em>Where 1 mole of acid reacts with 2 moles of NaOH</em>
Moles of H₂SO₄ are:
0.0500L × (0.361mol / L) = 0.01805 moles H₂SO₄
Thus, moles of NaOH that neutralize this acid are:
0.01805 moles H₂SO₄ × (2 mol NaOH / 1 mol H₂SO₄) = 0.0361 moles NaOH
And concentration is:
0.0361 moles NaOH / 0.0200L = <em>1.805M</em>
And, reaction of NaOH with HCl is:
NaOH + HCl → H₂O + NaCl
<em>Where 1 mole of NaOH reacts per mole of NaOH</em>
As you use 30.0mL = 0.0300L of NaOH to neutralize the HCl acid, moles of acid are:
0.0300L × (1.805mol / L) = 0.05415 moles NaOH = moles HCl
In 0.1000L:
0.05415 moles HCl / 0.1000L = <em>0.542M HCl</em>
Answer:
d. 6
Explanation:
Sodium chloride crystals have a<em> face-centered cubic structure</em>. This means that each of the atoms in the crystal is surrounded by other 6 atoms.
In the particular case of sodium chloride, the sodium cations are always surrounded by the oppositely-charged anions of chloride.