Which of the following solutions would show the greatest conductivity at 30°C?A. 0.20 M Ca(NO₃)₂
B. 0.25 M HCl
C. 0.30 M NaOH
D. 0.10 M NaCl
E. 0.40 M CH₃OH

Answers

Answer 1

Answer: Your answer will be A

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What is the very small center core of an atom is called?

Answers

the small part in the center of the atom is called a nucleus

The very small center core of an atom is called the nuclues, where the protons and neutrons are located.

A 25.5 liter balloon holding 3.5 moles of carbon dioxide leaks. How many grams of carbon dioxide escaped before the container could be sealed if the new volume of the balloon is 15.4L?

Answers

Assumptions made:
1. Temperature and pressure is constant.
2. Ideal gas is involved.

The variables involved in this problem is the moles of the gas and the volume. We find their relationship from the ideal gas law. PV=nRT. With all other concept besides n and V is constant, Volume is directly proportional to the amount of gas inside the balloon. Solving this is as simple as ratio and proportion.

25.5L/3.5 moles = =15.4L/X moles
X= 2.11 moles.

Answer:

61 grams

Explanation:

If the number of moles of CO₂ in the balloon is given to be 3.5 moles, the mass of CO₂ in the balloon will be

number of moles = mass ÷ molar mass

Hence, mass = number of moles × molar mass

Molar mass of CO₂ is 44g. This is 44 because the atomic mass of carbon is 12 while that of oxygen is 16. Thus, 12 + (16 × 2) = 44 g

mass= 3.5 moles × 44g

mass = 154g (which is the initial mass)

When the mass of CO₂ in the 25.5 liter balloon is 154g, the mass of CO₂ in the balloon when the volume of CO₂ in the balloon is 15.4 liter will be X

To get X,

25.5 L ⇒ 154g

15.4 L ⇒ X

cross-multiply, and

X = (15.4 × 154) ÷ 25.5

X = 93.00 grams (which is the final mass)

93.00 grams of CO₂ was left in the balloon, hence the mass of CO₂ that escaped will be: initial mass minus final mass

= 154g - 93g

= 61g

The mass of CO₂ that escaped is 61 grams

The immediate concern of chlorine exposure is the effects on the ____?

Answers

The effects of the exposure of chlorine happens instantly. The degree of damage would depend on how much was chlorine present, where did it enter and how long was the exposure. Inhalation of the gas would cause tightness in the chest, bronchospasm, and noncardiogenic pulmonary edema. When ingested, it would damage the gastrointestinal tract. Exposure to the gas would irritate eye and the skin. Also, it would cause burns.

The nucleus of 8Be, which consists of four protons and four neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of two protons and two neutrons). True or false?

Answers

Answer: The given statement is false.

Explanation:

When there is more difference in the ratio or number of protons and neutrons then nucleus of the atom becomes unstable in nature. This unstability is caused due to greater repulsion between the like charges of sub-atomic particles.

As a result, this force of repulsion becomes greater than the binding energy. And, this force is known as the weak force because it is unable to bind the neutrons and protons together.

The proton and neutron ratio for smaller elements is 1:1 and for higher elements it has to be 1:5. Since, $^(8)Be$ is a smaller element with 4 protons and 4 neutrons. Hence, the proton and neutron ratio is 1:1.

Therefore, $^(8)Be$ is stable in nature.

Thus, we can conclude that the statement nucleus of 8Be, which consists of four protons and four neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of two protons and two neutrons), is false.

Which type of perspective makes objects look similar to how they look in real life (select the best answer)linear perspective

fractional perspective

isometric perspective

Answers

I believe it's fractional perspective

Answer:

The answer is linear Perspective

Ricardo wants to determine the length of a strip of zinc metal. What is the SI unit for length? foot inch liter meter

Answers

Answer : The correct option is, meter

Explanation :

S.I : It is known as the international System of Units. It is defined as a scientific method to express the magnitude of the several basics units.

There are seven basic units in the system from which the other units are derived.

The seven base unit are, meter for length, kilogram for mass, second for time, ampere for current, kelvin for temperature, mole for amount of substance and candela for intensity.

As per question, the S.I unit of length of a strip of zinc metal is, meter.

Hence, the correct option is, meter

The Si unit for length is meters.

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How many moles of oxygen are produced when 26.5 mol of aluminum oxide are decomposed?

Which of the following is the SI unit used to measure mass?