i need help please with questions 35+38

Answer:

0.12 g of O2.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

H2O2 —> H2 + O2

Next, we shall determine the mass of H2O2 that decomposed and the mass of O2 produced from the balanced equation. This is illustrated below:

Molar mass of H2O2 = (2×1) + (16×2)

= 2 + 32

= 34 g/mol

Mass of H2O2 from the balanced equation = 1 × 34 = 34 g.

Molar mass of O2 = 16×2 = 32 g/mol

Mass of O2 from the balanced equation = 1 × 32 = 32 g

Summary:

From the balanced equation above,

34 g of H2O2 decomposed to produce 32 g of O2.

Finally, we shall determine the mass of O2 produced from the decomposition of 0.128 g of H2O2. This can be obtained as follow:

From the balanced equation above,

34 g of H2O2 decomposed to produce 32 g of O2.

Therefore, 0.128 g of H2O2 will decompose to produce = (0.128×32)/34 = 0.12 g of O2.

Therefore, 0.12 g of O2 was produced.

look the following picture i think that will help you too find out answer

Answer:

What you need is a thermometer and a clock.

Explanation:

Answer:

Please find the explained difference below

Explanation:

In a scientific experiment, the CONTROLLED VARIABLE, also known as CONSTANT, is the the variable that is kept unchanged by the experimenter throughout the course of the experiment. The constants are not part of the actual experiment but altering them can influence its outcome.

A control group is one of the two groups in an experiment (the other being experimental group) that doesn't receive the variable being manipulated (independent variable). The control group is the same as the experimental group except that the independent variable is unchanged in the control group. It is used to make a comparison with the experimental group.

For example, in an experiment to test the effect of sunlight on plant growth. Some plants were exposed to sunlight while some were placed in the dark. The CONTROL group of this experiment are the plants placed in the dark (no light). They didn't receive any treatment.

The constants of this experiment can be same amount of water, same type of plants used etc. This is done in order not to affect the outcome of the experiment.

Answer:

Density should be 8.5

Explanation:

When you subtract 17.2-10.0 for water displacement you get 7.2 which is the volume and you divide it by 15.7 so your equation will be 15.7/7.2 = 8.5

Answer:

4.1

Explanation:

Answer:

The Electronic configuration of 11N is

[Ne]3s1

Answer:

c. electrical neutrality.

Explanation:

A crystalline  solid possesses a rigid and long-range order; its atoms, molecules, or ions occupy  specific positions. The arrangement of such particles in a crystalline solid is such that  the net attractive intermolecular forces are at their maximum.

Ionic crystals, particularly, have two important characteristics:

(1) They are composed of charged species.

(2) Anions and cations are generally quite different in size.

The forces holding the atoms together are electrostatic attractions. Examples of these types of crystals include NaCl, LiF, MgO, CaCO₃.

Since they are composed of anions and cations, in stoichiometric amount, they are to be said electrically neutral.

Answer:Evaporation

Explanation:

Answer:

12.7m

Explanation:

FORMULA  

for an approximate result, divide the length value by 39.370078

Answer:

The noble gas notation for zinc would be [Ar]3d^104s^2

Explanation:

I hope this helps you:) let me know if it does make sense, okay?

Answer:

B

Explanation:

I believe it is B but I am not entirely sure! don't do this is B doesn't sound or look right to you!

Answer:

Its D

Explanation:

Larger atoms in group 8A require higher boiling points for the molecules to separate from each other than smaller atoms in group 8A.

Answer:

You can represent as a exponent. That will be the best way.

Explanation:

Answer:

Particle density is the volumetric mass of the solid soil. It differs from bulk density because the volume used does not include pore spaces. Particle density represents the average density of all the minerals composing the soil.

Hope that helps

Answer:

This might help u......

Answer:

protons and electrons

Explanation:

protons are positivley charged

electrons are negetively charged

but neutrons have no charge

Answer:

dependent variable: plant growth

independent: sunlight impact/amount of light

Explanation:

Answer: X-ray fluorescence from atoms occurs when a high energy particle or X-ray knocks an electron free from the innermost energy level of an atom, creating an unstable atom.

Explanation:

Several interactions can happen when an atom is exposed to an X-ray, depending on the energy of the X-ray and the properties of the atom.

The most frequent interaction is referred to as the photoelectric effect, in which an X-ray photon collides with an atom's inner-shell electron to evict it from its orbit and ionize the atom. As a result, an ion and a free electron are created. Another potential interaction is Compton scattering, in which an outer-shell electron receives some of the energy from the X-ray photon and is expelled at a different angle with less energy as a result. Additionally, pair production, which results in the formation of an electron-positron pair, can happen at very high energies. In many applications, these interactions are crucial.

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Answer:

among plants or in a garden

Explanation:

so first thing is to establish the main function of chloroplasts which is photosynthesis the next thing is to establish which organisms primarily carry out this process which are plants therefore mostly in plant cells hope it helps

Answer:

A. it can be easily manipulated to represent changes that occur slowly.

Answer:

360.8987 GRAM CALORIE OR 0.3608987 KILOCALORIE IS THE CALORIE REQUIRED TO CONVERT 2 GRAMS OF ICE AT 0 DEGREES C TO WATER VAPOUR AT 100 DEGREES C.

Explanation:

To convert 2 g of ice at 0 C to water vapor at 100 C:

First, the ice will be converted to water at 0 C

Then, water at 0 C to water vapor at 100 C

We must know that the latent heat of fusion for ice is 3.35*10^5 J/kg

the standard heat of enthalpy of water = 4200 J/kg

So therefore

Total heat to convert ice at 0 c to water vapor at 100 c is:

= M Lf + mc Q

= 2/ 1000 * 3.35 * 10^5 + 2/1000 * 4200 * (100 -0)

= 0.002 * 3.35 ^ 10^5 + 0.002 * 4200 * 100

= 0.0067 * 10 ^5 + 840

= 670 + 840

= 1510 J

The heat required to convert 2 g of ice at 0 c to water vapor at 100 C is 1510 J and to get the calorie value we divide the answer in joules by 4.184.

1510 joules = 360.8987 gram calories or 0.3608987 kilocalorie.

Amount calories are required to convert into vapor is 1,440 calories

Given that;

Amount of ice = 2 grams

Latent heat of water = 540 calorie

Find:

Amount calories are required to convert into vapor

Computation;

Heat required to melt at 0°C to water at 0°C = 2 × 80

Heat required to melt at 0°C to water at 0°C = 160 calorie

Water from 0°C to 100°C = 2 × 100

Water from 0°C to 100°C = 200 calorie

Water from 100°C to 100°C vapor = 2 × 540

Water from 100°C to 100°C vapor = 1,080 calorie

Amount calories are required to convert into vapor = 160 + 200 + 1080

Amount calories are required to convert into vapor = 1,440 calories

Find out more information about 'Latent heat'.

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Answer:

compound is CuO.

Explanation:

rxn:

CuO + 2HCl = CuCl2 (Blue green color) + H2O

Answer:

stem is the correct answer

Explanation:

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Answer:

Some of the most incredible discoveries in science were made because the data looked wrong! Once you have the data, you may need to perform a mathematical analysis to support or refute your hypothesis. Conclusion Conclude whether to accept or reject your hypothesis. There is no right or wrong outcome to an experiment, so either result is fine.

Answer:

Starter batteries

Explanation:

Answer:

The reason why it rotates the opposite way is due to an asteroid collision forcing the planet to spin backwards and is also the reason why a day on Venus is longer then a year on Venus

Answer: The surface of early earth was mostly molten and volcanic. The atmosphere was hot and highly toxic.

Explanation: Photosynthetic organisms were present when earth was primarily anoxic. photosynthetic organisms were present when earth was primarily anoxic. the early forms of photosynthesis did not produce oxygen as a waste product. cyanobacteria carry out anoxic photosynthesis. the early forms of photosynthesis did produce oxygen, but it was not enough to make a difference in the atmosphere. the early forms of photosynthesis were carried out in the water, and there was no way for the oxygen to move into the atmosphere.

1

Early earth have been toxic for modern day animals as at that time atmosphere is oxygen free, and cyanobacteris is able to survive due to symbiosis.

Cyanobacteria is a group of microorganisms that are related to bacteria but can perform photosynthesis. They are prokaryotic and are thought to be the earliest form of life on the planet.

Early earth atmosphere may proof toxic for modern day animals because at the earliest time, atmosphere is oxygen free means no oxygen is present in the atmosphere. And in the today scenario we can't imagine life without oxygen.

Cyanobacteria were able to suvive in that early atmosphere through alternative option like symbiosis in which a cell merges with another cell in order to the survival of both cells.

Hence life is toxic at the early time because of the absence of oxygen.

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