What is the nuclear symbol for the isotope of bromine?

Answers

Answer 1

Answer: The isotopes of bromine are Bromine-79 and Bromine-81. Bromine-79 has 35 protons and 44 neutrons while bromine-81 has 35 protons and 46 neutrons. They are represented as Br-79 and Br-81.

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In comparison with liquids and gases, solids area. more dense.
b. more easily compressed.
c. less organized.
d. more likely to flow.

Answers

In comparison with liquids and gases, solids are more dense. The answer is letter B. The solid has a more definite shape and volume. The particles are locked into place. It cannot be further compressed due to the bond that exists between the molecules. The kinetic energy of the molecules is close to none because the molecules are so close and so compact with each other.

What is the main factor that determines if a star will become a black hole

Answers

As a star runs out of fuel it can expand and will begin to form heavier elements such as carbon and iron (most of the matter in our solar system comes from extra-solar sources). Once it finally exhausts all of its fuel it will begin to collapse. It is here that the stars begin to undergo different fates.

Can Sodium be used to distinguish between cyclobutanol and butanoic acid

Answers

Answer:

$\boxed{\text{No}}$

Explanation:

Na reacts with all OH groups to produce hydrogen.

The reaction with cyclobutanol is shown below.

The reaction with butanoic acid is

$\rm CH_(3)CH_(2)CH_(2)COOH\xrightarrow{\text{Na}} CH_(3)CH_(2)CH_(2)COO^(-) + H_(2)$

Both compounds release bubbles of hydrogen, so you can't use sodium to distinguish between them.

What is the percentage composition of CF4

Answers

The percentage composition of CF4 is %C = 13.64% and %F = 86.36%

The solution are as follows:
Molar mass of CF4 = 88
molar mass of C = 12
molar mass of F = 4x19 = 76

% C = 12/88 x 100 = 13.64%
% F = 76/88 x 100 = 86.36%

The percentage composition of compound CF₄ is %C = 13.64% and %F = 86.36% .

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

The solution are as follows:

Molar mass of CF₄ = 88

molar mass of C = 12

molar mass of F = 4 x 19 = 76

% C = 12/88 x 100 = 13.64%

% F = 76/88 x 100 = 86.36%

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The average kinetic energy of water molecules is greatest in which of these samples?(1) 10 g of water at 35°C(2) 10 g of water at 55°C(3) 100 g of water at 25°C(4) 100 g of water at 45°C

Answers

Answer : The correct option is, (2) 10 g of water at 55°C

Explanation :

Average kinetic energy of the gas particle is directly proportional to the temperature of the gas particle.

Formula used :

$K.E=(3)/(2)(RT)/(N_A)$

where,

R = Gas constant

T = temperature

$N_A$ = Avogadro's number

From this we conclude that the kinetic energy is directly proportional to the temperature where 'R' and $N_A$ are constant. That means kinetic energy depends only on the temperature not on the mass.

(Higher the temperature, higher will be the kinetic energy)

Hence, the average kinetic energy of water molecules is greatest in 10 g of water at 55°C.

Final answer:

The sample with the highest average kinetic energy of water molecules is (2) 10 g of water at 55°C.

Explanation:

Kinetic energy is a fundamental concept in physics that describes the energy an object possesses due to its motion. It depends on both an object's mass and its velocity. Objects in motion have kinetic energy, and the faster they move or the more massive they are, the greater their kinetic energy. This energy can be transferred or transformed but is always conserved in a closed system.

The average kinetic energy of water molecules depends on the temperature of the water. The higher the temperature, the greater the average kinetic energy. In this case, the sample with the highest average kinetic energy would be (2) 10 g of water at 55°C. This sample has a higher temperature than the other options, therefore, the water molecules in this sample have the highest average kinetic energy.

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A 4.0L weather balloon is launched from sea level where the temperature is 25°C. It rises to an altitude where the pressure is 0.05atm and the temperature is -75°C. If the balloon has the capacity to expand to a 50 liter volume before bursting, will the balloon survive?