Explain how the system of the flask and the balloon illustrates the conservation of mass.

Answers

Answer 1

Answer:

The mass of the reaction system is conserved because, the mass lost from the reaction by the evolution of gas is collected inside a balloon to inflate it. Thus , the balloon and the flask creates a closed system where no mass is lost outside.

What is conservation of mass?

According to the law of conservation of mass, the mass can neither be created nor be destroyed. Thus the total mass of the system is conserved. However similar to the energy, mass can be transformed into energy.

As per this law, the total mass in a chemical reaction is conserved. Where, the total mass in the reactant side is equal to the total mass in the product side.

When the reaction flask is closed with a balloon, the gas if any evolved from the reaction will be collected to the balloon and it inflates. Thus the mass lost from the reaction system does not goes to the surroundings due to the closed system.

To find more on mass conservation, refer here:

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Answer 2

Answer: Both containers prevent the escape of matter of the reaction into an uncontrolled space, therefore it is a closed system (not isolated, since energy can still go in and out).

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Which of the following best describes how chemical changes differ from physical changes?A. Physical changes produce no new substances and chemical changes do.
B. Physical changes always involve the formation of a gas while chemical changes may not.
C. Physical changes can occur inside or outside the substance; chemical changes always occur outside.
D. Physical changes involve a change of state; chemical changes involve a change of shape.

Answers

Answer:

A is the answer.

Explanation:

Physical changes do not change the substance's composition but just the outside qualities. However, chemical changes change the composition of the substance and it's chemical properties.

Answer:

Explanation:

In the process of electrolysis, current can flow through a liquid because A. water molecules become negatively charged. B. hydrogen is electrically neutralized in the solution. C. negative ions are attracted to the anode. D. cations of the electrolyte accumulate at the positive electrodes.

Answers

B. Hydrogen is electrically neutralized in the solution. Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table.

The correct answer is

C. Negative ions are attracted to the anode.

What mass of sodium hydroxide is needed to make 0.500 L of 2.50 M NaOH ?

Answers

Answer:

50 g NaOH

General Formulas and Concepts:

Chemistry - Solutions

Reading a Periodic Table
Using Dimensional Analysis
Molarity = moles of solute / liters of solution

Explanation:

Step 1: Define

0.500 L

2.50 M NaOH

x moles of solute

Step 2: Define conversions

Molar Mass of Na - 22.99 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of NaOH - 22.99 + 16.00 + 1.01 = 40 g/mol

Step 3: Find moles of solute

2.50 M NaOH = x moles NaOH / 0.500 L

x = 1.25 moles NaOH

Step 4: Convert

$1.25 \ mol \ NaOH((40 \ g \ NaOH)/(1 \ mol \ NaOH) )$ = 50 g NaOH

Step 5: Check

We are given 3 sig figs. Since our final answer has 2 sigs, there is no need to round.

When was tin discovered tin is an element please help 75 pts

Answers

It was used from the Bronze Age(3000 BC) and tin was used in the bronze.

The bicycle is said to be the most energy-efficient means of transportation. Where does the energy that drives it come from?

Answers

The energy that drives the bicycle comes
from the food that the rider eats.

well the food that the person eats powers the mucles and the person uses their wieght/gravity to push down on the pedals which pulls the chain and, since the wheel is a diffarent size, you either get more power and less speed or more speed and less power

What are the functions of protein in organisms?

Answers

Proteins make up many many important structures in our cells ( ex : receptors , Enzymes , integral proteins and so on )

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