find heat capacity when 47.0 J of heat is added to 13.0 g of a liquid, its temperature rises by 1.71 ∘C

Answer:

3564 = 3.564 x 10^3

Explanation:

i.e expresing the value in standard form.

Answer:

B

Explanation:

actin and reaction force are equal Newton 3 law

Answer:

Invasive species are living things not naturally found in that ecosystem. They upset the natural balance.

Explanation:

Answer:

3.13%

Explanation:

Step 1: Given data

Mass of sodium chloride (solute): 3.60 g

Volume of solution: 115 mL

Step 2: Calculate the weight/volume % of the  solute

We will use the following expression.

%w/v = mass of solute / milliliters of solution × 100%

%w/v = 3.60 g / 115 mL × 100%

%w/v = 3.13%

The weight/volume % of the  solute is 3.13%

Answer:

3.13

Explanation:

correct

Answer:

Reference point, or frame of reference, a system of geometric axes in relation to which measurements of size, position, or motion can be made. Reference point, a geometrical point used to define the location of another point

Explanation:

Answer:

How do amoeba respire.

Define Diffusion.

It can serve as a valuable starting point for your research on igneous rocks. It can be a valuable resource for understanding the formation and characteristics of igneous rocks.

However, I can suggest three commonly used and reputable websites that you can consider using to start your research:Encyclopedia Britannica (www.britannica.com): This website provides reliable and comprehensive information on a wide range of topics, including geology and earth sciences.

United States Geological Survey (USGS) (www.usgs.gov): The USGS website offers a wealth of geological information, including articles, maps, and data related to rocks, minerals, and various geological processes.

Geology.com (www.geology.com): Geology.com is a website that covers various geological topics, including igneous rocks. It provides articles, images, and interactive tools that can help you explore and understand the subject in detail.

Remember to critically evaluate the information obtained from these sources and cross-reference it with other reputable sources to ensure accuracy and reliability.

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Answer:

The volume of the container is 12L.

Explanation:

The given information from the exercise is:

- Initial volume: 4.0L

- Initial number of moles: 2.0 moles

- Final number of moles: 6.0 moles

To calculate the volume of a container with 6.0 moles, we can use a mathematical rule of three:

So, the container will have a volume of 12L.

As the atom has 7 protons and 7 electrons, it can be referred to as neutral atom, the correct option is B.

When an atom has an equivalent number of electrons as well as protons, it has an equal number of electrons with negative electric charges and protons with positive electric charges.

As a result, the total electric charge of the atom is zero, and it is said to be neutral. As a result, all elements in the periodic table have neutral atoms.

Because the atom has 7 protons and 7 electrons, it is known as a neutral atom.

Thus, the correct option is B.

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Answer:

It describes the idea that the number and kinds of atoms present before and after a chemical reaction remain constant.

Explanation:

This one best describes it.

you can't really see the conservation of energy and describe it.

it is not the basic principle for chem solutions, there are tons.

mass in a chemical rxn always changes.

thus, best option is the last one.

Divide by 1000

145÷1000=0.145

Hope this will be helpful.

Answer:

False

Explanation:

As I like to think of it, equilibrium will shift either 'forwards' (to increase products) or 'backwards' (to increase reactants) to oppose any change in system;

If heat is added, the equilibrium will shift in the direction that reduces heat within the system;

In other words, it will shift in favour of the endothermic reaction, i.e. the reaction where heat is gained by the molecules/atoms and therefore taken out from the system;

If the 'forwards' reaction, producing NH₃, is exothermic (i.e. energy is released in the reaction), then the 'backwards' reaction is endothermic;

So the equilibrium will shift in this direction, which is the reaction of 2 NH₃ molecules producing N₂ and 3 H₂

240.1g is the mass of sodium propanoate. Mass was widely considered to be tied to the amount of matter within a physical body.

A body's mass is an inherent quality. Prior to the discoveries of the atom or particle physics, it was discovered that, despite having the same quantity of matter in theory, various atoms and elementary particles had varied masses. There are several conceptions of mass in contemporary physics that are theoretically different but practically equivalent. The resistance of the body to acceleration (alterations of velocity) in the presence of a net force may be measured experimentally as mass.

pH =Pka + log [salt]/[acid]

4.87=4.87+ log [salt]/[1]

4.87=4.87+ log [salt]/[1]

[salt] = 10 mol dm⁻³

mole = molarity ×volume

mole = 10×0.25

          =2.5

mass = 2.5×96.07

        = 240.1g

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The number of moles of gas produced from the reaction of 2.00g of potassium with an excess amount of water is 0.025 moles.

The reaction of potassium with an excess amount of water is:

2K + 2H\(_2\)O \(\rightarrow\) 2KOH + H\(_2\)

To calculate the moles of hydrogen gas first we need to calculate moles of potassium in 2.00g

No. of moles = (mass) / (molecular mass)

The mass given is 2.00 g and the Molecular mass is 39.09 units

∴ No. of moles = (2) / (39.09) = 0.05

From the above reaction, we get that 2 moles of potassium give 1 mole of hydrogen gas. Thus, 0.05 moles of potassium gives 0.025 moles of hydrogen gas.

Therefore, the no. of moles of hydrogen gas produced is 0.025 moles.

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Answer:

(B. Plants and meat)

Explanation:

Answer:

the theoretical 100% yield of the product in milligrams is 302920 mg

Explanation:  

Given the data in the question;  

245 mg of an oil

Using the moles of our protected aldehyde calculated earlier (2.96)

the molecular weight of the product (102 g/mol) = 102000 mg/mol

so, the mass of aldehyde produced (100% yield) will be;

⇒ number of moles × molar mass

⇒ 2.96 mol × 102000 mg/mol

⇒ 302920 mol.mg / mol

⇒ 302920 mg

Therefore, the theoretical 100% yield of the product in milligrams is 302920 mg

Krypton, Chromium, and Oxygen with the following symbols Kr-13, Cr-2, and O-15 respectively have 23 electrons.

The atomic number of an atom determines the number of electrons it has. When the number of protons is equivalent to the number of electrons, the atom is electrically neutral. An anion, on the other hand, is an atom with a negative charge. It has gained an electron or two, or even more. Below are the chemical symbols for three different atoms or atomic anions with 23 electrons.Krypton:Kr has an atomic number of 36, indicating that it has 36 electrons. However, if we add 13 electrons to it, the total number of electrons becomes 49. Krypton with 13 additional electrons becomes Kr-13, with a total of 49 electrons.Chromium:Cr has an atomic number of 24, indicating that it has 24 electrons. Adding two more electrons to it, the total number of electrons becomes 26. The atomic anion with 26 electrons is Cr-2.Oxygen:Oxygen has an atomic number of 8, indicating that it has 8 electrons. However, if we add 15 electrons to it, the total number of electrons becomes 23. Oxygen with 15 additional electrons becomes O-15, with a total of 23 electrons.

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There is no reason to run these solutes at the 20 MWCO because they are both much smaller than the MWCO of the membrane.

The MWCO (molecular weight cut off) is the molecular weight of a solute at which it will be retained by a membrane during a process such as ultrafiltration or dialysis. If a solute has a molecular weight higher than the MWCO of a membrane, it will be retained and not pass through the membrane. If the molecular weight of a solute is lower than the MWCO, it will pass through the membrane.

In this case, glucose has a molecular weight of 180 g/mol (6 carbons x 12 g/mol per carbon + 6 oxygens x 16 g/mol per oxygen) and albumin has a molecular weight of approximately 81,942 g/mol (607 amino acids x 135 g/mol per amino acid). Both of these solutes have molecular weights that are much lower than 20,000 g/mol, which is a typical MWCO for ultrafiltration or dialysis membranes.

They would both easily pass through the membrane and be lost during the process. Instead, a membrane with a much lower MWCO would be needed if we wanted to retain these solutes during a process such as ultrafiltration or dialysis.

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Answer:

22.24°C.

Explanation:

The change in temperature of the iron can be calculated using the formula: ΔT = Q / (m * c), where ΔT is the change in temperature, Q is the heat added, m is the mass of the substance and c is the specific heat capacity.

Substituting the given values into the formula: ΔT = 115 cal / (47.0 g * 0.11 cal/g⋅°C) ≈ 22.24°C

So, the change in temperature of the iron is 22.24°C.

Answer:

sodium

Explanation:

this is because sodium is neutral ....hence the pH formed will be 7

The element sodium will form an oxide that will give a pH of less than 7 when in solution.

Any compound that could be broken down into simpler chemicals by regular chemical processes is referred to as a chemical element.

pH is a measurement of how acidic or basic an aqueous solution is in relation to other liquids.

Sodium is neutral in nature that's why the element sodium will form an oxide that will give a pH of less than 7 when in solution.

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Answer:

NaCl: 184g

MgCl₂: 6.60g

Na₂SO₄: 9.26g

CaCl₂: 1.28g

KCl: 0.70g

NaHCO₃: 0.13g

Explanation:

To convert these concentrations to masses we need to convert molarity to moles and moles to grams using molar mass of each salt:

[CaCl₂] = [Ca²⁺] = 0.0115M

[HCO₃⁻] = [NaHCO₃] = 0.0015M

[SO₄²⁻] = [Na₂SO₄] = 0.0652M

[Mg²⁺] = [MgCl₂] = 0.0693M

[K⁺] = [KCl] = 0.0094M

And using the concentration of Cl⁻:

[Cl⁻] = [NaCl] + 2[MgCl₂] + 2[CaCl₂] + [KCl]

[3.32] = [NaCl] + 2[0.0693] + 2[0.0115] + [0.0094]

[NaCl] = 3.149M

The masses you need are:

NaCl (Molar mass: 58.44g/mol):

3.149mol/L * 1L *  (58.44g/mol) =

MgCl₂ (Molar mass: 95.211g/mol):

0.0693mol/L * 1L *  (95.211g/mol) =

Na₂SO₄ (Molar mass: 142.04g/mol):

0.0652mol/L * 1L *  (142.04g/mol) =

CaCl₂ (Molar mass: 110.98g/mol):

0.0115mol/L * 1L *  (110.98g/mol) =

KCl (Molar mass: 74.55g/mol):

0.0094mol/L * 1L *  (74.55g/mol) =

NaHCO₃ (Molar mass: 84g/mol):

0.0015mol/L * 1L *  (84g/mol) =

Answer:

4 mole hydrozen and 2 mole oxyzen

Explanation:

Answer:How many moles of aluminum are needed to react completely with 1.2 mol of FeO? 2Al(s) + 3FeO(s) = 3Fe(s) + Al2O3(s). 0.8 mols.

Explanation:

Both 1 mole of sodium chloride and 1 mole of aluminum chloride are made of 6.02 × 10²³ formula units.

A formula unit can be described as the lowest whole number ratio of ions in an ionic compound. The formula mass of a substance is defined as the sum of the atomic masses of the ions in the formula unit of an ionic compound.

The formula unit describes the empirical formula of a covalent or ionic solid compound which is utilized as an independent entity for stoichiometric calculations. Formula mass can be calculated from the sum of the atomic masses of constituent atoms in an ionic compound.

A molecule is composed of two or more elements and these elements are covalently bonded. Also, the molecular mass provides the mass of a molecule with respect to that of a carbon twelve atom which has a mass of twelve units.

One mole of sodium chloride has 6.02 × 10²³ formula units NaCl and similarly, One mole of aluminum chloride has 6.02 × 10²³ formula units AlCl₃.

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Answer:

Magnesium gets covered with a layer of magnesium oxide when kept in air for a long time. This layer hinders the burning of magnesium. Hence, it is to be cleaned before burning.

Answer:

Magnesium ribbon must be cleaned before burning in the air because the layer of magnesium oxide is formed on the ribbon due to the reaction of magnesium with air slowing down or interfering with the burning process. So it is cleaned in order to get the desired chemical reaction i.e 2Mg+O2⟶2MgO.

Answer:

From personal experience

Explanation:

If is not felt by the writer, the reader will not feel it either!

Answer:

the writers emotions about the writing will affect the way the reader feels

Explanation:

Alcohol iodide nucleophile Is identified as  the alkyl iodide and the nucleophile that would be used.

Nucleophile is defined as a chemical species that provides an electron pair to create a chemical bond in response to an action. A nucleophile typically has one electron pair and is negatively charged or neutral.

Alcohols with alkyl halides of hydrogen. Alcohols often undergo a nucleophilic substitution reaction to produce an alkyl halide and water when exposed to HBr or HCl. Alkanes and alcohols can be converted into alkyl halides through a nucleophilic substitution process.

Thus, alcohol iodide nucleophile Is identified as  the alkyl iodide and the nucleophile that would be used.

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Answer:

The Sun transforms nuclear energy into heat and light energy.

Our bodies convert chemical energy in our food into mechanical energy for us to move.

Answer:

the relation between Kp and Kc is

\( \colorbox{red}Kp=Kc{[RT]}^{∆n}\)

where

∆n=no.of moles of gaseous product - no.of moles of gaseous reactant in the balanced chemical equation.

R=universal gas constant

T=temperature.

The values of angular momentum quantum number , which are possible for n = 3 , will be 0 ; 1 and 2 .

Reason:

{Quantum number is allowed to take go from zero to n-1 , n being the principal quantum number. So, in your case, if n is equal to 3, the values it must take are 0, 1, and 2.}