Answer: The Answer is A
Only one side of the Moon is visible from Earth because the Moon rotates on its axis at the same rate that the Moon orbits the Earth – a situation known as synchronous rotation, or tidal locking. The Moon is directly illuminated by the Sun, and the cyclically varying viewing conditions cause the lunar phases.
Answer:
The pressure is 16, 9 atm
Explanation:
We use the formula PV=nRT. The temperature in Kelvis is: 273 + 25 = 298K
PV=nRT P =(nRT)/V
P= (0, 450 mol x 0,082 l atm/K mol x 298)/0,650 l= 16, 91723077atm
Answer:
According to the Safety Data Sheet (SDS), the major harzard of concentrated HCl is that it may cause severe burns to skin, eyes and mucous membranes.
Explanation:
The SDS also informs that:
Most Important Hazards:
- May cause severe burns to skin, eyes and mucous membranes.
- Steam produced is irritating.
- Pollution of rivers and water bodies by changing the pH. Affects flora and fauna that comes in contact with acid.
Product Effects:
- If in direct contact with eyes will cause serious burns and vision loss.
Adverse effects to human health:
- Inhalation causes severe respiratory tract irritation. May cause pulmonary edema. The contact with the skin causes burns, which can lead to dermatitis. Prolonged contact of acid leads to visual damage to vision loss. If swallowed, may cause burns to the mucous membranes of the mouth and digestive system.
Environmental Effects:
- Affects rivers and streams by changing the pH of the water. May contaminate the soil. Vapors may temporarily affect air quality.
Physical and chemical hazards:
- Reacts with metals such as; iron, aluminum, zinc, magnesium, among others, forming hydrogen, which mixed with air may cause explosion and air displacement upon ignition under specific.
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To solve this we use the equation,
<span>M1V1 = M2V2</span>
<span>where M1 is the concentration of the stock
solution, V1 is the volume of the stock solution, M2 is the concentration of
the new solution and V2 is its volume.</span>
0.25<span> M x V1 = 0.15 M x .500 L</span>
<span>
V1 = 0.3 L or 300 mL</span>
