b. alpha
c. proton
d. positron
Answer:
The correct answer is b.
Explanation:
Alpha particles are fully ionized helium (4He) nucleus. These nucleus consist of two protons and two neutrons. They are positively charged (+2) due to the absence of electrons. It has the same mass as the He atom (6,64 * kg) or (4 uma), and the same charge (3,2 * C).
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lithium atom
potassium atom
sodium atom
The atoms having partially filled shells have orbitals with electrons half or less than the number of electrons that can be accomodated in it. The atom which has a partially filled second electron shell in the ground state is lithium.
Lithium is 3rd element in periodic table and thus having 3 electrons in it. The main shell electronic configuration of lithium is written as K=2, L=1. Thus the second shell L has only one electron and it is said to be partially filled.
The element hydrogen is having only one electron located in the K shell and it have o more shells which are filled.
The elements sodium and potassium are first group elements sodium with 11 electrons and potassium atom with 19 electrons. Both are having 3 main shells and one electron in the last shell. Thus their second shell is completely filled.
Hence, the atom which have partially filled second electron shell in the ground state among the following is lithium. Thus, option B is correct.
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Answer:
See below
Explanation:
This is a simple reaction.
Calcium and chlorine molecule are combined to get calcium chloride.
Ca + Cl₂ → CaCl₂
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squirrels that bury nuts in the ground
B.
fungi that decompose the remains of dead trees
C.
flowers that turn to follow the sun as it moves across the sky
D.
bees that help spread pollen from one plant to another
Answer: D. bees that help spread pollen from one plant to another
Explanation: i took the k12 test and passed :)
Answer: Option (e) is the correct answer.
Explanation:
A device which consists of a sealed metal container and it is immersed in an insulated sealed container which is filled with water used to calculate heat of combustion of a reaction.
Volume remains constant in a bomb calorimeter. Basically, a bomb calorimeter measures the changes occurring in the internal energy because of a chemical reaction.
Thus, we can conclude that a bomb calorimeter measures for combustion reactions.
A bomb calorimeter measures ΔE for combustion reactions. Thus, option E is correct.
A device which consists of a sealed metal container and it is immersed in an insulated sealed container which is filled with water used to calculate heat of combustion of a reaction.
Volume remains constant in a bomb calorimeter. Basically, a bomb calorimeter measures the changes occurring in the internal energy because of a chemical reaction.
Thus, we can conclude that a bomb calorimeter measures for combustion reactions.
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The options are
measures ΔE for aqueous reactions
measures ΔH for oxidation solutions
measures ΔH for hydrolysis solutions
measures ΔT for hydrolysis solutions
measures ΔE for combustion reactions
Explanation:
The given data is as follows.
V = 250.0 ml, T = 58^{o}C = 58 + 273 = 331 K
n = 2.48 moles, P = ? , R = 0.082 atm L /K mol
Therefore, calculate the pressure using ideal gas equation as follows.
PV = nRT
P =
=
= 0.269 atm
Thus, we can conclude that pressure of the given gas is 0.269 atm.