What is the element?
Answers
Helium - 2 protons
lithium - 3
beryllium - 4
Carbon has 6 protons
Related Questions
A construction company recently filled in a local pond to build new houses. Duringthe following weeks, a local scientist noticed a decline in the mosquito population inthe area. The scientist wants to conduct a study that will measure the change in thelocal mosquito population over a period of three months. Which research methodwould give the scientist the best data for conducting his study?A. a three-month case study observing the behavior of animals that depend onmosquitoes for foodB. a survey asking residents about their observations of the local mosquitopopulationC. a collection device in the area that counts the number of mosquitoes caughtweeklyD. a controlled lab experiment with mosquitoes that limits watercolor theexperimental group
Which gas law has the assumptions of a fixed amount and volume of a gas?Boyle’s lawGay-Lussac’s lawAvogadro’s lawCharles’s lawcorrect answer is gay lussacs law
Which atomic number corresponds to the element which is most stable?1381636
Which of these processes take place at the same temperature?freezing and condensationmelting and sublimationcondensation and vaporizationsublimation and boiling
Answers
Light shining through the less dense material.
Land plants need to be tall and the vascular tissues are what provide rigidity to the plant’s cells.
Land plants need to photosynthesize and the vascular tissues is where this process occurs.
Land plants don’t really need these structures as they can absorb water from the air through their leaves.
Answers
determine if it was DNA or RNA?
Answers
Answer:
Nucleobases should be checked. RNA contains adenine, guanine, cytosine and uracil instead of thymine, so if we isolate uracil, it means that it is RNA, if not, then is DNA.
Answers
The amount of aluminum deposited when a current of 10A is passed through a solution of aluminum salt for 1930s is 5.4 g.
What is electrochemical cell ?
An electrochemical cell converts chemical energy into electrical energy. Metals with higher negative electrode potential undergo oxidation and its ionization produces electron flow through the solution.
The weight of the metal that deposited by reduction is related to the mass of metal, current passed and time as follows:
w = z It
where z = E/96500 F
Equivalent mass of Al, E = 27 g
t = 1930 s
current I = 10 A.
Now, the weight of aluminum metal deposited is calculated as follows:
w = 1930 s × 10 A × 27/96500 = 5.4 g.
Therefore, the weight of Al deposited on the electrode is 5.4 g.
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Answer:
AL*3+ + 3e- =AL.
（10A×1930）÷96500=0.2mole e-
0.2÷3×27=1.8g（AL）
Answers
Answer:
The unit of pressure in the SI system is the pascal (Pa), defined as a force of one Newton per square meter. The conversion between atm, Pa, and torr is as follows: 1 atm = 101325 Pa = 760 torr. A standardized prefix system indicates fractions and multiples of metric units (e.g. milli-, mega-).
Answer:
Pascals(Pa)
Explanation:
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B.Flammability
C.Density
D.Solubility