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2 years ago

Help me, no links, no i don't knows. reading science sheet

Chemistry

2 answers:

Arada [10]2 years ago

6 0

The answer above is 100% right

erastovalidia [21]2 years ago

3 0

Answer:

Heat is a form of energy that moves from hot things to cold things. In other words, heat is energy that flows from objects with a high temperature. Temperature is the average kinetic energy of the particles in an object and is measured using a thermometer.

Heat can move from object to object in three ways. One way that heat flows is called conduction, which occurs when two objects are touching.

In conduction, the particles in the high temperature object are vibrating quickly compared to the low temperature object. When the particles in the high temperature object bump into the particles in the low temperature object, the low temperature object's particles begin to vibrate more quickly. Another form of heat transfer is convection, which occurs in liquids and gases. In convection, the part of the liquid or gas with high temperature is less dense than the part with low temperature so the high temperature parts rise and the low temperature parts sink.

In both conduction and convection, heat is transferred through a material. However, heat energy can also travel through empty space in a third way called radiation, which is how heat travels from the sun to the Earth.

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Given the balanced equation representing a reaction: 2h2o(l) + 571.6 kJ -> 2h2(g) + o2(g). What occurred as a result of this

Ivan

Answer: option D) energy was absorbed and entropy increased.

Explanation:

1) Given balanced equation:

2H₂O (l) + 571.6 kJ → 2 H₂ (g) + O₂(g).

2) Being the energy placed on the side of the reactants means that the energy is used (consumed or absorbed). This is an endothermic reaction.

So, the first part is that energy was absorbed.

3) As for the entropy, it is a measure of the disorder or radomness of the system.

Since, two molecules of liquid water were transformed into three molecules of gas, i.e. more molecules and more kinetic energy, therefore the new state has a greater degree of radomness, is more disordered, and you conclude that the entropy increased.

With that, you have shown that the right option is D) energy was absorbed and increased.

7 0

3 years ago

When lewis structures are drawn, do you only show valence electrons??

Lynna [10]

Yes you do cause its more explanation to

8 0

3 years ago

Water comes from different a.levels b.phases c.sources d.stages

bezimeni [28]

Answer:

C. sources

Explanation:

6 0

2 years ago

Define Each Piece of the Microscope

horrorfan [7]

1) Body tube (Head): The body tube connects the eyepiece to the objective lenses. Arm: The arm connects the body tube to the base of the microscope. Coarse adjustment: Brings the specimen into general focus. Fine adjustment: Fine tunes the focus and increases the detail of the specimen.

2)Microscopes are made up of lenses for magnification, each with their own magnification powers. Depending on the type of lens, it will magnify the specimen according to its focal strength.

3)In simple magnification, light from an object passes through a biconvex lens and is bent (refracted) towards your eye. ... The eyepiece lens usually magnifies 10x, and a typical objective lens magnifies 40x. (Microscopes usually come with a set of objective lenses that can be interchanged to vary the magnification.)

3 0

2 years ago

Which solution is more concentrated?

deff fn [24]

2 moles of NaOH dissolved in 1 litre of solution is the solution with more concentration.

Answer: Option A

Explanation:

Concentration of solution is the measure of the amount of solute dissolved in the solvent of the solution. So this is measured using the molarity of the solution. Molarity is determined as the number of moles of the solute present in the given amount of solvent.

$\text {Molarity}=\frac{\text {Moles of solute}}{\text {Amount of solvent }}$

In this present case, the option A gives the molarity of 2 M as

$\text {Molarity}=\frac{2}{1}=2 M$

But the second option, mass of NaOH is given. So we have to determine the molarity. First we have to find the molar mass of NaOH. We know that 1 mole of NaOH will contain 40 g/mole.

1 g of NaOH = 40 g of NaOH

1 g of NaOH = 1/40 moles

So 2 g of NaOH will contain $\frac{2 g}{40 g/mole}$ which is equal to 0.05 moles of NaOH.

Thus, the molarity of 2 g of NaOH will be

Molarity = $\frac{0.05 moles }{1 L}$ =0.05 M

Thus, the option A is having higher concentration as the molarity is more for 2 moles of NaOH dissolved in 1 l of solution.

7 0

2 years ago