19.B is the chemical symbol of which element? Boron
Boring
Balkite
Beryllium
20.Zinc (Zn) has an atomic number of 30 and an atomic mass of 65. How many neutrons does a stable atom of Zn have?
30
35
60
95
Answers
Number 2 is ..35
Related Questions
If 6.49 mol of ethane (C2H6) undergo combustion according to the unbalanced equationC2H6 + O2 −→ CO2 + H2O ,how many moles of O2 is required?1. 27.792. 7.633. 8.44. 25.485. 12.6356. 21.0357. 23.88. 19.049. 22.71510. 26.775Answer in units of mol.
What can be determined if only the atomic number of an atom is known?(1) the total number of neutrons in the atom, only(2) the total number of protons in the atom, only(3) the total number of protons and the total number of neutrons in the atom(4) the total number of protons and the total number of electrons in the atom
What is the chemical formula for mercury(I) nitrate
What are geometric isomers?
A only
A and B
C only
D only
Answers
Answer: D only.
Explanation:
The amount of Earth's water located in oceans is 97%. Rest 3% is in the form of rivers, glaciers, polar ice-caps, lakes and ground water. Out of this 3% also, only 0.3% is freshwater which found in swamps, lakes and rivers.
In the pie chart, part D represents 97%. Thus, part D only represents the amount of Earth's water located in the oceans.
Answers
the equation for calculating density is m÷v
Answers
Answer : The final number of moles of gas that withdrawn from the tank to lower the pressure of the gas must be, 0.301 mol.
Explanation :
As we know that:
At constant volume and temperature of gas, the pressure will be directly proportional to the number of moles of gas.
The relation between pressure and number of moles of gas will be:
where,
= initial pressure of gas = 24.5 atm
= final pressure of gas = 5.30 atm
= initial number of moles of gas = 1.40 moles
= final number of moles of gas = ?
Now put all the given values in the above expression, we get:
Therefore, the final number of moles of gas that withdrawn from the tank to lower the pressure of the gas must be, 0.301 mol.
2)look up the chemical name and chemical formula of each acid and base
Answers
Acetic acid in vinegar, used in cooking - CH₃COOH
Citric acid in lemons and oranges - C₆H₈O₇
Carbonic Acid in soft drinks - H₂CO₃
Bases
Sodium Hypochlorite is found in bleach - NaClO
Sodium Hydroxide found in drain cleaners - NaOH
Sodium bicarbonate, also known as baking soda which is used in cooking - NaHCO₃
Answers
Answer:one-party system
Explanation:Just had this question on my post test and was correct
(1) CCl4 (3) C6H12O 6
(2) CH3OH (4) Ca(OH)2