Can can someone help me 49-58 I give Brainly

One time explanation of one observation is a hypothesis.

Whenever, an assumption is made juts by observation and without proper testing then that is referred as an hypothesis.

For example- If my friend is late, so I might assume that he or she must have been stuck in traffic. So, this assumption is not tested yet and is made based on my observation. So, this is a hypothesis.

Whenever, a conclusion is given after several experiments and testing after observing something in science is referred as scientific theory.

For example- Atomic theory given by Dalton was based on several experiments. However, theories can also be proved wrong as Dalton's theory was proved wrong later on my JJ Thomson.

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The number of aluminum atoms you lost, given the data from the question is 3.67×10²⁶ atoms

We'll begin by obtaining the mass of the aluminum atoms lost. This is illustrated below:

Density = mass / volume

Cross multiply

Mass = Density × Volume

Mass of aluminum lost = 2.699 × 6.1×10³

Mass of aluminum lost = 16463.9 g

Finally, we shall determin the number of atoms of aluminum lost. This can be obtained as follow:

From Avogadro's hypothesis

1 mole of aluminum = 6.02×10²³ atoms

But,

1 mole of aluminum = 27 g

Thus,

27 g of aluminum = 6.02×10²³ atoms

Therefore,

16463.9 g of aluminum = (16463.9 g × 6.02×10²³ atoms) / 27 g

16463.9 g of aluminum = 3.67×10²⁶ atoms

Thus, 3.67×10²⁶ atoms of aluminum were lost

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Answer:

cause the pot is probably boiling over making a ton of bubbles and foam

Explanation:

Answer:

neutron

Explanation:

A proton is one of three main particles that make up the atom. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms.

Answer:

can you repost with picture? I can help.

Answer:

1/5

Explanation:

1/5×500

=so guess this is the one

Answer:

to the left of his table :)

Nutrient molecules are important because the body breaks down nutrient  molecules into absorbable molecules that can produce energy in the body for carrying out daily tasks.

Therefore, nutrient molecules are important for overall growth of our body.

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Based on the concept of conductivity, if it conducts heat or electricity, it allows heat and electricity to pass through it.

Conductivity is the ability of certain materials to allow heat ad electricity to flow or pass through them easily.

Conductivity is the opposite or resistivity or insulation which is the property of material that makes them restrict the movement of heat or electricity through them.

Materials that allow heat and electricity to flow through them easily are called conductors.

Conductors are mostly metallic objects because metals allow heat and electricity to flow through them easily.

Other conductors are the electrolytes which are substances which when in molten form, allow electricity to easily pass through them.

In conclusion, conductivity denotes the ability of a material to allow heat and electricity to pass through it.

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Answer:

Explanation:

c

The process which most likely involves collecting physical evidence at a crime scene is she collecting anything that could be related to the crime and is denoted as option D.

This is referred to as unlawful behavior which is punishable by the law of an area or country and examples include theft, murder etc.

When crime takes place such as in the case of a murder, a professional who is referred to as a forensic scientist is invited to the scene so as to collect anything that could be related to the crime as this will help in the investigations by the appropriate bodies and ensure that justice is served.

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Answer: D. She will collect anything that could be related to the crime.

Explanation:

The characteristics among the choices given which best describe the properties of liquids are

The correct answer choices are options B, C and D.

Of course, liquid do not have a fixed shape but they a fixed volume. The particles of liquids are not tightly packed together as in solids but have some spaces between their particles.

Liquids are characteristized by the following properties such as:

So therefore, the characteristics among the choices given which best describe the properties of liquids are

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When an electron moved from the ground state to the excited state it gained energy and passed to a high level of energy.

An electron shell is a layer of the electrons that contains a given amount of energy and may pass to higher levels by excitation which also read to change the orbital from the ground state to the excited state.

In conclusion, when an electron moved from the ground state to the excited state it gained energy and passed to a high level of energy.

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The performer can interpret the score however he/she wishes in a graphic score. The correct option is B.

A graphic score is simply another method of notating music or sounds on a page, in addition to the more traditional 5-line stave.

They created graphic scores or graphic notation, a new way of visualizing music. Graphic scores are frequently distinct from traditional musical scores.

Graphic scores, as opposed to lines and dots on a musical stave, can use a variety of images and symbols to instruct the performer on what to play.

In a graphic score, the performer can interpret the score however he or she sees fit.

Thus, the correct option is B.

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Freshly-cut eggplant, while uncovered to the air, quickly oxidizes and turns black, kind of the manner an apple goes brown after it is reduced and uncovered to air. the Apple inexperienced eggplant's outer skin is smooth, shiny, and maybe yellow or pale inexperienced.

Leaving slices of apples exposed to the air results in the apple turning an acquainted brown shade. This process, referred to as enzymatic browning, is due to the reaction of positive enzymes with phenolic compounds, both gift inside the apple, that occurs when they may be uncovered to oxygen inside the air.

The eggplant turns brown whilst uncovered to air because a reaction is occurring whilst a cut piece of fruit is exposed to oxygen. this is called enzymatic browning. The call enzymatic browning comes from the truth that an enzyme positioned inside the fruit reacts with oxygen from the air to turn the fruit brown.

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The total length of the two pieces of tubing with correct number of significant figures is 7.7 cm.

There are certain rules regarding significant figures.

The rule about the addition of two quantities is that when two quantities are added then the number of digits after decimal in the sum of the two quantities should be equal to the least number of decimal places present in the given quantities.

In the above case, the two numbers are 4.5 cm and 3.222 cm and they contain 1 and 3 digits after decimal. So, the final answer should have only 1 decimal place.

Adding 4.5 cm + 3.222 cm = 7.722 cm

The answer should contain only 1 digit after decimal so the answer is rounded off to 7.7 cm.

Thus, the total length of the two pieces of tubing with correct number of significant figures is 7.7 cm.

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Answer:

Explanation:

z=36

f=88

c=66

Answer:

A

Explanation:

benzene is an automatic chemical, so a answer A chlorobenzene, had to be the the aromatic hydrocarbon

To calculate mass of CaCO3, individual mass of the elements is taken (Ca= 40.1g/mol, C= 12.0g/mol, O=16.0g/mol). So, 40.1+12.0+48.0 = 100.1gmol. Therefore, 100.1 g/mol is the answer.

Calcium carbonate is a source of calcium in the supplemental form. It is also present as a part of exoskeleton in certain animals. It is also found as a component in eggshells.

It is obtained from carbon resources. Calcium carbonate is industrially used in production of limescale and in plaster of paris for roofing. It is often used to treat hyperacidity and given as an antacid.

Thus, calcium carbonate has wide range of chemical applications.

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Due to the temperature of the stars the stellar spectrum of Betelgeuse different than the spectra of the other stars in the constellation Orion.

Constellation Orion is defined as a prominent constellation of the orion which has been located on the equator of celestial and it can be visible throughout the whole world. It is the most identified constellations in the sky at night.

Constellation Orion  is the most identified constellations in the sky at night. Constellation Orion is defined as a prominent constellation of the orion which has been located on the equator of celestial and it can be visible throughout the whole world.

Therefore, Due to the temperature of the stars the stellar spectrum of Betelgeuse different than the spectra of the other stars in the constellation Orion.

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Answer:

1.128*10¹⁹ [GHz].

Explanation:

1) the initial formula is

E=hν, where ν - required frequency,

2) according to the formula above

[tex]\nu=\frac{E}{h};\\ \nu=\frac{748*10^{-8}}{663*10^{-36}}=1.128*10^{28}[Hz][/tex]

If the mass of a crucible is 12.1 g and the mass of a crucible containing CuSO4 is 23.1 g, then the mass of the CuSO4 is 11 gram.

Given,

mass of crucible is 12g

mass of crucible with copper sulphate is 23.1g

so the mass of CuSO4 = mass of crucible with copper sulphate - mass of crucible

= 23.1 g - 12.1g = 11 g

Therefore mass of CuSO4 is 11g

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An exothermic reaction is a reaction that produces heat this type of reaction is a chemical change.

The correct option is B.

Exothermic reactions are chemical in nature and are distinguished by the release of energy in the form of heat or light. One instance of this kind of reaction, when the release is in the form of both heat and light, is lighting a match. An exothermic reaction causes the release of heat, which raises the temperature of the surrounding area. An exothermic process process that absorbs heat cools the environment.

Polymerizations, combustion, thermite reactions, mixing potent acids and bases As an everyday example, hand warmers exploit the exothermic reaction brought on by iron oxidation.

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0.74 mol/lit

You mixed  500.0 mL of 0.250 M iron(III) chloride solution with 475.0 mL of 0.350 M barium chloride solution

As per given in the above statement,

volume of fecl3 = 5oo.ml

fecl3 = 0.250 M

= 0.250 mol/litre

volume of Bacl2, = 175.0mL

Bacl2 = 0.350M

= 0.350 mol/litre

we need to calculate moles of fecl3 and

Bacl2

first :

fecl3= 0.250 mol/litre (Molarity)

moles of FeCl3, = molarity * volume

= 0.250 * 500 ml

= 0.125 moles

moles of fecl3 = 0.125 moles

now, bacl2 = 0.350M

moles of bacl2 = molarity * volume

= 0.350 * 175/1000

= 0.061 moles

furthermore:

one mole of bacl2 will give one mole of ba^+2 and 3 moles of cl-

0.125 moles of fecl3 = 3 * 0.125 cl-

= 0.375 moles of cl-

similarly :

one mole of bacl2 will give one mole of ba^+2 and 2 mole of cl-

= 0.061 moles of bacl2 = 2 * 0.061

= 0.122 moles of cl-

total volume of solution :

= 500 ml + 1750 ml

= 0.675 litre

total number of moles of cl-

= 0.375 + 0.122

= 0.497 moles

now,

molarity of cl- =  total moles of solute / volume of solution

= 0.497 moles/ 0.675 litre

= 0.74 mol/lit

molarity of cl- = 0.74 mol/lit

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A 39.2 g sample of copper took up the 4.4 cm³ of space , so the Density of the copper sample is 8.9 g/cm³.

Density is the ratio of the mass of a substance and the volume occupied by that substance. Density measures how tightly-packed the particles in a substance are the more tightly packed the particles are, the denser the substance will be.

The formula for calculating the density of a substance is given below as:

Density = mass/volume

Given :

The mass of the copper sample = 39.2 g

The volume of the copper sample = 4.4 cm³

Hence, the density of the copper sample will be:

The density of copper sample = 39.2 g/4.4 cm³

The density of copper sample =8.9 g/cm³

Therefore, the density of the copper sample is 8.9 g/cm³

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Answer: 8.9

Explanation: sample of 39.2 grams sample of copper took up to 4.4 centimeters of space. And then you will get the density of the copper piece in g/cm3.

The density of the can is 0.041 g/mL.

The term density is the ratio of the mass to the volume of an object. We know that the volume is an intrinsic property of the substance. The volume does not change thus, it can be used to identify a substance.

Now we have that the volume of the liquid that the can could hold is 332 ml. This is the real volume of the aluminum can. The mass of the can is found to be 13.5g.

Density = mass/volume = 13.5g /  332 ml = 0.041 g/mL

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The required empirical formula

This is further explained below.

Generally, The empirical formula of a chemical compound is the most straightforward representation of the atom counts in the molecule as whole numbers.

As a straightforward illustration of this idea, consider the empirical formula of sulfur monoxide, which is denoted by the symbol SO, and compare it to the empirical formula of disulfur dioxide, which is denoted by the symbol S2O2.

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0.313 moles NH3 moles of ammonia would be required to react exactly with 0.764 moles of copper(II) oxide in the following chemical reaction.

A balanced equation is one for a chemical reaction where the overall charge and the number of atoms for each component are the same for both reactants and the products. In those other words, the weight and charge of both ends of the reaction are equal.

2 NH₃(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g) is a balanced equation.

The coefficients of the compounds give the mole ratios,

So 2 moles of ammonia (NH3) will react with 3 moles of copper(II) oxide, (CuO).  

We use simple proportion or use dimensional analysis

By proportion:  2 mol NH3/3 mol CuO = x mol NH3/0.470 mol CuO and x = 0.313 moles NH3

By dimensional analysis:  0.470 mol CuO x 2 mol NH3/3 mol CuO = 0.313 moles NH3

Therefore, 0.313 moles of NH3  of ammonia would be required to react exactly with 0.764 moles of copper(II) oxide in the following chemical reaction.

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