What are the answers for this

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

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Answer:

dependent variable: plant growth

independent: sunlight impact/amount of light

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]Density = \frac{mass}{volume} [/tex]

From the question

mass = 43 g

volume = 11.1 mL

Substitute the values into the above formula and solve for the density

That's

[tex]Density = \frac{43}{11.1} \\ = 3.873873...[/tex]

We have the final answer as

Density = 3.9 g/ mL to one decimal place

Hope this helps you

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:

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.

Answer:

Mass of seawater = 512.5 gram

Explanation:

Given:

Volume of seawater = 500 ml

Density of seawater = 1.025 g/ml

Find:

Mass of seawater

Computation:

Mass of seawater = Volume of seawater × Density of seawater

Mass of seawater = 500 × 1.025

Mass of seawater = 512.5 gram

Answer:

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

Explanation:

Answer:

It needs to go through a chemical reaction

Explanation:

Natural resources undergoes chemical reaction to become synthetic materials.

Natural material undergoes several chemical changes to chnage the characterstics of the resources into synthetic material.

Some examples of synthetic materials are medicines, plastics, and new fuels which are extracted from trees or plants, natural fibers, and petroleum.

Hence, the correct option is "It needs to go through a chemical reaction".

Answer:

It needs to go through a chemical reaction.

Stomach ulcers, I've read it online and I take the test

In the 18th century, Italian biologist Lazzaro Spallanzani designed an experiment supporting the hypothesis that gastric juices are partly responsible for digesting food. The human illness which Spallanzani's work eventually shed light on Stomach ulcers.

pH is used to measure whether the substance is acidic, basic or neutral and the range is 0 - 14.

Gastric acid is also called gastric juice or stomach acid it is made up of water, enzymes, hydrochloric acid, electrolytes. The pH of gastric acid is between 1 and 3 that means it is acidic is nature.

Thus from the above conclusion we can say that In the 18th century, Italian biologist Lazzaro Spallanzani designed an experiment supporting the hypothesis that gastric juices are partly responsible for digesting food. The human illness which Spallanzani's work eventually shed light on Stomach ulcers.

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Answer:

13

Explanation:

Answer:

it is 13

Explanation:

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:25grams

Explanation: the mass stays the same even when it changes form

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:

Kilogarm

Explanation:

Just took a test on this!

Answer:

Reaction 2, because a single reactant is decomposed

Explanation:

It's the only one where the product was decomposed while the others became one. I took the quiz and it was correct.

formula for density of liquid = mass ÷ vol

= 14.0 g ÷ 18.0 cm³

= 0.77778 g/cm³ ( 5sf)

= 0.778 g/cm³ ( 3sf )

18.0 cm³ is the same as 18.0 ml

Therefore, the liquid will float on water as the water is denser than the liquid.

18.0 cm³ is equivalent to 18.0 ml, in light of the fact that water is denser than liquid, the liquid will float on it.

Density is defined as d = M/V, where M stands for mass and V for volume. The unit of density that is most frequently used is grams per cubic centimeter.

The formula for liquid density is mass divided by volume.

= 14.0 g ÷ 18.0 cm³

= 0.77778 g/cm³

= 0.778 g/cm³

The same procedure used to determine a solid's density is used to determine a liquid's density. Calculate the fluid's mass, then its volume, then divide mass by volume.

To determine the fluid's mass, weigh the fluid in the container, pour it out, weigh the empty container, and then subtract the empty container's mass from the mass of the filled container.

Therefore, in light of the fact that water is denser than liquid, the liquid will float on it.

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Answer:

we can reach the same conclusions by applying different experimental and observational procedures

Explanation:

The scientific method is a process that can be summarized in the following steps: 1-to raise a question, 2-to make a hypothesis, 3-to obtain data from observations and/or experiments, and finally, 4-to obtain conclusions that enable to confirm (or reject) the hypothesis. The scientific method is flexible because it is not necessary to follow 'stringent' guidelines in order to reach the same conclusions. In consequence, the predictions derived from such results can be tested again to determine the veracity of the results.

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:Evaporation

Explanation:

Answer:

compound is CuO.

Explanation:

rxn:

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

Answer:

1.24*10^6=1.24*1000000=1240000

6.2*10^-3=6.2*0.001=0.0062

Explanation:

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Answer:

What you need is a thermometer and a clock.

Explanation:

Answer:fertilizer

Explanation:

Answer:

protons and electrons

Explanation:

protons are positivley charged

electrons are negetively charged

but neutrons have no charge

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:

Both extensive and intensive properties are physical properties, which means they can be measured without changing the substance's chemical identity. For example, the freezing point of a substance is a physical property: when water freezes, it's still water (H2O)—it's just in a different physical state.

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:

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.