I need it done assap

Why would the federal government and city government find it necessary regulate water standard?

Helga [31]

They do this so that when you drink it or use it the contaminates that used to be in it dont make you sick

4 0

3 years ago

What volume would 25.0g of Oxygen occupy at STP

Veseljchak [2.6K]

I’m not sure what this one would be

4 0

3 years ago

Explain its significance.Check all that apply. Systems with high potential energy tend to change in the direction of lower poten

KatRina [158]

Answer:

your question is not clearly stated, let me assume your question to be ;

Explain the significance of the law of conservation of energy. Check all that apply below.

1. Systems with high potential energy tend to change in the direction of lower potential energy, obtaining energy from another objects. Systems with high potential energy tend to change in the direction of lower potential energy, releasing energy into the surroundings.

2. In the exchanges, the total energy is always conserved; energy is neither created nor destroyed. In the exchanges, the total energy is always changed; energy is created and destroyed.

3. In chemical and physical changes, matter never exchanges energy with its surroundings. In chemical and physical changes, matter often exchanges energy with its surroundings.

Explanation:

1. System with high potential energy tends to change in a direction to system with low potential energy. This system with high potential energy moving towards the direction of lower potential energy will give out their potential energy to the surrounding in form of heat, as they also receive kinetic energy from the surrounding. This is a law of conservation of energy. Energy from the system was transformed from one form to another.

2. Total energy in an exchange is always conserved or transformed.

It is conserved when energy is not lost( an enclosed system). It is changed or termed destroyed when energy is lost to the surrounding in form of heat ( an open system). Energy can neither be created not destroyed but can be transformed from one form to another. This means that the energy that we think was created are the potential energy in the system, while the energy we think was destroyed, are those energy given to the surrounding in form of heat.

3. In a chemical or physical change where matter never exchange energy with it surrounding are called closed system. The exchange of energy in this type of system is only wetin the system.

In a chemical or physical change where matter exchanges energy with it's surrounding are called open system. It is either an Exothermic reaction(the system gives out energy to the surrounding) or Endothermic reaction( the system takes energy from the surrounding).

5 0

3 years ago

1.Build or draw the Lewis structure for each of the molecules listed below.

bagirrra123 [75]

This may help you

Allright for <span><span>H2</span>O:</span> - The central atom is? --> the oxygen atom - How many atoms are bonded to the central atom? --> 2 hydrogen atoms - How many lone pairs of electrons are on the central atom? --> O has 6 electrons and has 2 single bonds, so 2 pairs - How many single bonds are there in this molecule? --> 2 - How many multiple bonds (double and/or triple) are there in this molecule? --> none For each of your molecules, answer the following questions: 1. Determine the electronegativity between the atoms of each molecule. Electronegativity O = 3.44 Electronegativity H = 2.20 3.44-2.20=1.24, so the electronegativity between O and H = 1.24 2. Identify the bond as either ionic or covalent. Electronegativity of 0.0-1.7 = covalent Electronegativity of 1.7-3.3 = ionic So it's a covalent bond 3. State whether the molecule is polar or non polar. Electronegativity of 0.5-1.7= polar covalent 4. Identify the structure as having hydrogen bonding, dipole-dipole moments or London dispersion forces (LDF). <span><span>H2</span>O</span><span> = hydrogen bonding</span>

5 0

3 years ago

Rank the following aqueous solutions in order of increasing<br> (c) freezing point;

saveliy_v [14]

0.01 m $AgNO_{3}$ < 0.03 m $CuSO_{4}$ < 0.04 m urea

As molal concentration rises, so does freezing point depression. It can be expressed mathematically as ΔTf = Kfm.

<h3>What is Colligative Properties ?</h3>

The concentration of solute particles in a solution, not the composition of the solute, determines a colligative properties .

Osmotic pressure, boiling point elevation, freezing point depression, and vapor pressure reduction are examples of ligand-like properties.

<h3>What is freezing point depression?</h3>

When less of another non-volatile material is added, the temperature at which a substance freezes decreases, a process known as Freezing-point depression.

Examples include combining two solids together, such as contaminants in a finely powdered medicine, salt in water, alcohol in water.

An significant factor in workplace safety is freezing points.
If a substance is kept below its freezing point, it may become more or less dangerous.
The freezing point additionally offers a crucial safety standard for evaluating the impacts of worker exposure to cold conditions.

Learn moree about Colligative Properties here:

brainly.com/question/10323760

#SPJ4

5 0

2 years ago