2a. What is the difference between weight and mass?

Answer:

physical, chemistry l, organic chemistry, inorganic chemistry, analytical chemistry and biochemistry

Explanation:

are the 5 primary branches of chemistry

The answer would be the prediction for the given experiment of fish.

The question is incomplete and the question is like the fish will die or not.

And anything about the living being we say whether die or not, he/she will or not, or even talking about the weather this all comes under the prediction.

We can only predict the possible terms about the living beings or nature by seeing their present ability or conditions. It all depends on the nature, environment, culture etc.

As a scientist or a chemist , they can easily predict the outcomes of the several experiments.

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The specific heat capacity of the metal when the temperature rises by 12.4°C is 3.569 J/g°C.

Specific heat capacity is defined as the heat capacity of the substance divided by the mass of the substance.It is the amount of heat added to one unit mass of substance to increase it's temperature by one unit.The SI unit is joule per kelvin per kilogram.

It varies with temperature and for each different state of matter it is different.Specific heat capacity of a substance is higher when it is allowed to expand as a result of  heating.It is measured by a technique called differential scanning calorimetry.

It is calculated by the given formula,

W=mcΔt

where W=energy supplied

m= mass of substance

c=specific heat capacity

Δt= temperature change

Substituting the values given in the problem in the above equation,

c=43.6/0.985×12.4=3.569 J/g°C

Thus, the specific heat capacity of metal is 3.569 J/g°C.

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Answer: white blood cells

Explanation: they protect you from illnesses and diseases

Precipitate refers to a solid that develops from solution during a chemical process.

A solid that is distinct from any of the reactants is referred to as a precipitate. An insoluble product may arise when solutions containing ionic chemicals are combined.

Combination, disintegration, solitary, dual, and combustion are the five fundamental kinds of chemical processes. You may classify a reaction into one of these groups by looking at the reactants and products. Several categories will apply to some reactions.

When pieces of two ionic compounds are swapped, creating two new compounds, this reaction is known as a double replacement reaction (also known as a double displacement, swap, or metathesis reaction).

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Consider the model of a sodium atom. An orange circle labeled upper n a is surrounded by three concentric circles. The innermost ring has dots at the north and south positions. The next ring has eight dots, evenly spaced, with dots aligning with those in the inner ring. The outermost ring has one dot at the north position. The distribution of electrons in different shells feature does the model show accurately.

Sodium is a chemical element with the atomic number 11 and the symbol Na (derived from the Latin natrium). It is a delicate, silvery-white metal that is exceedingly reactive. Due to its placement in group 1 of the periodic table, sodium is an alkali metal. 23Na is the only stable isotope of it.

The periodic table's chemical element sodium has the atom number 11 and the symbol Na (Natrium in Latin). Alkali metals include the soft, waxy, silvery sodium, which is a reactive metal that occurs frequently in natural substances (especially halite).

Alkali metal group (Group 1 [Ia]) element sodium (Na), according to the periodic table. The element sodium is a very delicate silvery-white.

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The complete question is ''Consider the model of a sodium atom. An orange circle labeled upper N a is surrounded by three concentric circles. The innermost ring has dots at the north and south positions. The next ring has eight dots, evenly spaced, with dots aligning with those in the inner ring. The outermost ring has one dot at the north position. Which feature does the model show accurately?

A) the size of the electrons in different shells

B) the shapes of the orbitals in different shells

C)the distribution of electrons in different shells

D)the orientation of the orbitals in different shells

The actual density of a certain material is 7.48g/[tex]cm^{3}[/tex]. a student measures the density of the same material as 7.2g/[tex]cm^{3}[/tex]. the percent error of the measurement is 3.74 %.

Percent Error is defined as difference between experimental value and the theoretical value divided by theoretical value and multiply by 100.

Percent Error =( | experimental value - theoretical value | ) / 100 %

here,

experimental value = 7.2 g/ [tex]cm^{3}[/tex]

theoretical value = 7.48 g/[tex]cm^{3}[/tex]

percent error ( % error) = ( | 7.2 - 7.48 | ) / 7.48 × 100 %

                                      =( 0.28 / 7.48 ) × 100 %

                                     = 3.74 %

Thus,The actual density of a certain material is 7.48g/[tex]cm^{3}[/tex]. a student measures the density of the same material as 7.2g/[tex]cm^{3}[/tex]. the percent error of the measurement is 3.74 %.

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graduated cylinder, beaker, thermometer and hot plate can be used bring one liter of water to 85 c

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The reason the reaction between hydrochloric acid and calcium carbonate appears not to obey the law of conservation of mass is the evolution of carbon dioxide gas.

The law states that in every chemical reaction, the mass of the participating atom is conserved but the atoms themselves can change forms.

Thus, for every atom, the mass before the reaction must also be equal to the mass after the reaction.

So, if two substances A (1 g) and B (1 g) react, the products should weigh: 1 + 1 = 2 g.

Now, in the case of the reaction between hydrochloric acid and calcium carbonate, something happens.

[tex]CaCO_3 + 2HCl -- > CaCl_2 + H_2O + CO_2[/tex]

One of the products formed is carbon dioxide gas. Unless the reaction vessel is sealed, the gas will escape and the weight of the products left will be less that the reactants.

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The number of atoms in 2.4 g of uranium is 6.07×10²¹ atoms

1 mole of Uranium = 6.02×10²³ atoms

But

1 mole of Uranium = 238 g

Thus,

238 g of Uranium = 6.02×10²³ atoms

We can obtain the numbber of atoms in 2.4 g of uranium as illustrated below:

238 g of Uranium = 6.02×10²³ atoms

Therefore,

2.4 g of Uranium = (2.4 g × 6.02×10²³ atoms) / 238 g

2.4 g of Uranium = 6.07×10²¹ atoms

Thus, we can conclude that 6.07×10²¹ atoms are present in 2.4 g of Uranium

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The molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water is 1.677m.

Molality is defined as the ratio between the amount of solute in a solution and the mass of corresponding solvent in the solution.

m = moles of solute/mass of solvent(kg)

If we have 18.5 g of calcium nitrite, using the formula for molar mass, solve for its number of moles.

n = mass/MM

moles of solute = 18.5 g calcium nitrite / 132.089 g/mol

moles of solute = 0.1400570827 moles calcium nitrite

Using the formula for molality, solve the molality of solution prepared by dissolving 0.1400570827 moles calcium nitrite in 83.5 g of distilled water.

m = moles of solute/mass of solvent(kg)

m = 0.1400570827 moles calcium nitrite / 83.5 g(1kg/1000g)

m = 0.1400570827 moles calcium nitrite / 0.0835 kg

m = 1.677330332

m = 1.677

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Adding baking soda to vinegar or battery acid will bubble, but not water. If the liquid fizzles, waft your fingers over it to smell it; battery acid does not smell like vinegar. Fizzing is battery acid, not vinegar.

This is further explained below.

Generally, A little amount of baking soda might be sprinkled on top of the liquid; if the liquid is vinegar or battery acid, it will fizz, however, water will not.

In conclusion, Whether it fizzles, or wafting your fingers over the liquid to obtain a scent of it might help you discern if it has the smell of vinegar; battery acid does not smell like vinegar.

If it fizzles, however, it is not vinegar; it is the smell of battery acid.

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The correct answer is 18.01468 g/mole

1)Atomic mass calculates the mass of the atom.

2) The mass of one mole of water is equals to the atomic/ molecular mass in grams.

                                              = 2.01568 + 15.999 g/mol

                                              =18.01468 g/mol

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The pH of a 0.1 M solution of acetic acid in water is higher than that of a 0.1 M solution of HCl in water because the acetic acid does not fully ionizes in water but HCl completely ionizes in water.

Acetic acid being a weak electrolyte, does not completely dissociates in water. So regardless of the concentration of acetic acid, the pH of 0.1 M acetic acid is higher.

                         CH₃COOH + H₂O → CH₃COO⁻ + H₃O⁺

HCl  is a strong acid which dissociates into H⁺ and Cl⁻ ions in the water. In aqueous, the H⁺ joins a water molecule to form a hydronium ion, H₃O⁺.

                         HCl + H₂O → H₃O⁺ + Cl⁻

As pH = -log [H⁺], therefore lesser the [H⁺], greater will be the pH. HCl gives more H⁺ than acetic acid, therefore, pH of acetic acid is higher than HCl.

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False

Pure chromium is produced either by the thermal reduction of Cr2O3 with aluminum or by the electrolysis of trivalent chromium solutions... Not Silicon

Answer:

Red pandas live in the Eastern Himalayas in places like China, Nepal, and Bhutan . They spend most of their time in trees. Their semi-retractable claws help them move easily from branch to branch.

Explanation:

my answer would be A

The property that caused the sample with zinc shavings to react faster than the sample with the chunk of zinc is surface area.

The rate of a reaction is the rate at which reactants form products in a chemical reaction. There are various properties that increase or decrease the rate of reactions, which include temperature, catalyst, surface area and nature of the reaction.

In the question above, the main property that increased the rate of the reaction is surface area. Surface area is the amount of a solid reactant that is exposed. The more the surface area exposed, the faster the reaction.

The beaker of acid with the chunk of zinc is slower, because the zinc has less of its surface area exposed to the acid. In the second sample, reaction takes place on each of the zinc shavings, which will increase the rate at which products are going to form.

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A sample of nitrogen gas is contained a piston with a freely moving cylinder in a piston with a freely moving cylinder at 0° C , the volume of the gas 371 ml. the temperature must the gas be heated a volume of 557 ml is 123.091°C

According to the Charles's law,

V1 / T1 = V2 / T2

here,

V1 = 371 ml

V2= 571 ml

T1 = 0°C = 273 K

T2 = ?

putting the values in the formula ,

V1 / T1 = V2 / T2

T2 = ( T1 × V1) / V1

     =  (273 K) × ( 557 ml) / 371 ml

    = 152061 K / 371

    = 409.8 K

In °C = 409.8 - 273

         136.8 °C

Thus,A sample of nitrogen gas is contained a piston with a freely moving cylinder in a piston with a freely moving cylinder at 0° C , the volume of the gas 371 ml. the temperature must the gas be heated a volume of 557 ml is 136.8 °C.

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The percentage of the water entering the small intestine is absorbed by the small intestine is 92.02%

Volume of water that is leaving the small intestine should be

= 9400 - 750

=8650 ml

Now the percentage should be

= (8650/ 9400)100

= 92.02 %

Thus 92.02 % of the total water entering the small intestine is absorbed itself by the small intestine.

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B. The MOST plausible prediction and explanation of the ending mass is 3g of (AgCl + NaBr); matter is conserved so the total mass will be the same in the beginning and end.

The law of conservation of matter states that mass cannot be created nor destroyed, but can be converted from one form to another.

When the law of conservation of matter or mass is applied in a chemical reaction we will observe the following;

From the given chemical reaction;

2 g of NaCl + 1 g of AgBr = ?AgCl + ? NaBr

Based on the law of conservation of matter, the total mass of the reactants (3 g) must be equal to the total mass of the product (3 g) because matter is conserved.

Thus, the MOST plausible prediction and explanation of the ending mass is 3g of (AgCl + NaBr); matter is conserved so the total mass will be the same in the beginning and end.

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Answer: By taking away research funds if certain standards are not met

Answer:

Proton (p for positive): Positive +1 charge, relative mass of 1

Neutron (sounds like neutral): no charge, relative mass of 1

Electron (sounds like electric): negative charge, relative mass of 0.0005

One nitrogen atom and one hydrogen atom, each weighing six mass units, make up an atom of ammonia.

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Your question seems incomplete, please refer below for the complete question:

If ammonia were formed from Daltons simplest formula of one atom of each element what would he have concluded about the relative masses of nitrogen and hydrogen atoms?

Answer:

When the molecules are placed in the individual wells they are all at the same distance because al the wells were created with the same comb. Gel electrophoresis is applying an electrical current to separate the molecules. Once gel electrophoresis is ran, the negative dyes will run towards the positive end of the gel and the positive dyes will run towards the negative end of the gel. The heavier dyes will run a shorter distance compared to the lighter dyes, this is how they are separated out.

Explanation:

Answer:

A situation gel electrophoresis is used in DNA fragments like in a crime scene or to distinguish species.

Explanation:

The number of atoms in 0.310 g of P₂O₅ is 6.57 × 10²⁰ atoms.

The number of atoms in a substance can be calculated by multiplying the number of moles present in that substance by Avogadro's number as follows:

no of atoms = no of moles × 6.02 × 10²³

According to this question, there are 0.310grams of phosphorus oxide (P₂O₅). The molar mass of P₂O₅ is 283.889 g/mol.

no of moles = 0.310g ÷ 283.889 g/mol

no of moles = 0.00109moles

The number of atoms = 6.02 × 10²³ × 0.00109 moles = 6.57 × 10²⁰ atoms

Therefore, 6.57 × 10²⁰ atoms is the number of atoms in P₂O₅.

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The trials are precise but are not accurate.

The degree to which a measured value approaches a standard or true value is referred to as accuracy. Accuracy is achieved by taking small readings. On the other hand, precision is defined as how closely two or more measurements match one another.

Therefore, accuracy is the degree to which a measurement is near its real value, whereas precision is the degree to which subsequent measurements taken in the same circumstances get the same results.

Now, the three readings obtained by weighing an apple using a balance are trial 1, trial 2, and trial 3.

The mass of the apple during the first trial =167.0g.

The mass of the apple during the second trial =166.9g.

The mass of the apple during the third trial = 167.2g

The true mass of the apple =172g

Therefore, a true mass describes your results in terms of precision and accuracy.

Now, in your three trials to measure the weight of the mass of the apple, your readings replicates were extremely near to each other. As a result, your trials are precise. However, the true mass was 172 g, and if you average your three trials, you would get roughly 167.1 g, which isn't very near to the true mass. As a result, your trials are precise but not accurate.

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You measure the mass of an apple using a balance. You get these three measurements: Trial 1: 167.0 g Trial 2: 166.9 g Trial 3: 167.2 g You know that the true mass of the apple is 172 g. Describe your results in terms of precision and accuracy. Explain your answer.

The volume occupied by a mole of gas at 2.34 atm and 260 Kelvin is 9.12 L.

The Ideal gas law states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.

It is expressed as;

PV = nRT

Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant.

Given the data in the question;

Plug the given values into the ideal gas equation and solve for V.

PV = nRT

V = nRT/P

V = ( 1mol × 0.0821 Latm/molK × 260K ) / 2.34 atm

V = ( 21.346 Latm ) / 2.34 atm

V = 9.12 L

The volume occupied by a mole of gas at the given pressure and temperature is 9.12 L.

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Answer:

1.85g per cubic centimeter (g/cm3

Explanation:

because density=mass/volume, so it will be 50g divide by 27ml =. 1.85g/cm3

By looking at the body they can come up with an estimated time of how long it’s been without oxygen(dead).

The correct answer is when electrons bump into atoms and other electrons.

Because of how tightly packed their particles are, metals are particularly good heat conductors because vibrations are transferred very fast. Additionally, they have a lot of free electrons.

Metals get their strength and other qualities from these when they gently float through the framework. The free electrons that are nearest to the heat source are heated as the metal warms up. As a result, they move more quickly through the metal, crashing into other electrons as well as atoms. They naturally vibrate more quickly as a result (or move through the metal faster in the case of collisions with other free electrons). As a result, the metal swiftly dissipates the heat.

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