A 20. 0 g lead ball is heated in a Bunsen burner to 705 degrees celsius. It is then dropped into a 500. 0 g water bath. What is the initial temperature of the water if the final temperature is 35 degrees celsius? The C of lead is 0. 13 J/g degrees C.


[ Remember: Ch2o = 4. 18 J/g degrees celsius]

A lubricant must keep its properties in the presence of additives and other items. Lubricating oil colours are more of a test for a grade or brand of oil's consistency than they are for its attributes. Thus, option B is correct.

There are four different kinds of liquid lubricants. Mineral oil a. It is a material made from petroleum. These oils are stable at high temperatures because they have a high paraffine and naphthanic content.

Examples include steam cylinder oil, wire rope oil, refrigeration grade oil, gear oil, machine or engine oil, and circulating oil.

Therefore, they should be used at lower cutting speeds than other types of cutting fluids. They make cutting surfaces smoother.

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Answer:

The molecular formula of the compound with an empirical formula of CH2 and a molar mass of 28 would be C2H4.

The instantaneous evaporation of liquid refrigerant in an evaporator is called flash gas

What is a flash gas?

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Answer:

I put the right structures in the pictures for you

Answer:

air is a solution because it is homogeneous, uniform throughout,and doesn't scatter light

Answer:

Helium is stable because it has 1 shell and the first shell can only have 2 electrons. Hydrogen is unstable because it has 1 shell but only 1 electron.

Answer:c

Explanation:

As the combined mass of the HCl and NaOH is 15 grams before the reaction. Therefore the mass after the reaction will be 15 grams according to the law of conservation of mass. Therefore, option (C) is correct.

Matter can be transformed form via physical changes and chemical changes from one form to another form, during any of these changes, the total mass is conserved. The same quantity of matter exists before and after the chemical or physical as none of the matter is created or destroyed.

The balanced equation between the reaction of HCl and NaOH:

\(HCl +NaOH \longrightarrow H_2O +NaCl\)

According to the law of conservation of mass, the mass of HCl and NaOH will be equal to the mass of the products water and NaCl.

As mentioned in the question the combined mass of HCl and NaOH measured before the reaction is 15 grams. Therefore, the mass of the products in the closed container will be equal to 15 grams as well.

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Your question was incomplete,  most probably the complete question was,

Fernando places 15 ml of HCl and 50 ml of NaOH in 100 ml of a beaker. He places them on a scale together and measures the combined mass of 15 grams.

After the HCl and NaOH react, Fernando measures the mass again. Using the mass before the reaction, what is the mass after the reaction? Remember, It is in a closed system.

A. 5.00 grams

B. 10.00 grams

C. 15.00 grams

D. 20.00 grams

Answer: no water

Explanation:

Answer:

a substance that is a crystalline compound, contains no water

Answer

Because carbonic acid is a weak acid.

A weak acid is only partially ionized in a solution.in other words,a weak acid doesn't completely dissociate or break apart into ions in a solution.

Mark the rule

Carbonic acids contain C means it is too weak .

So it can't form acidic salts

Answer:

It becomes an a positive ion (cation)

Explanation:

In order to become an ion, atoms should lose or gain electrons.

magnesium is losing 2 electrons which means that the ratio of protons is more than electrons. (proton-positive , electron-negative)

Magnesium has 12 electrons (electronic configuration: 2,8,2) which means it needs to lose 2 electrons. After it loses 2 electrons, there will be 12 protons and 10 electrons and since there is more protons it becomes positively charged.

Making it Mg²⁺

When magnesium loses two electrons, it becomes a magnesium ion with a 2+ charge, often denoted as Mg2+. The magnesium ion has a stable electron configuration and is attracted to negatively charged ions or molecules, such as chloride (Cl-) or oxygen (O2-).

Magnesium (Mg) is a metallic element that belongs to the second group of the periodic table. It is a highly reactive metal and easily loses two electrons to form an ion with a positive charge.

Magnesium ions are essential for many biological processes, including muscle contraction, nerve function, and the synthesis of DNA and RNA. They are also used in various industrial applications, such as the production of aluminum alloys and the purification of molten iron.

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Answer:

the catalyst is the two gray dots

The molecular mass of 3.6 moles of H₂SO₄.

So let us first calculate the molecular mass of 1 mole of H₂SO₄ and then when we calculate the molecular mass of 1 mole of H₂SO₄, we will calculate the molecular mass of 3.6 moles of H₂SO₄ by multiplying the molecular mass of 1 mole of H₂SO₄ by 3.6

Molecular mass of 1 mole of H₂SO₄ = 2*(molecular mass of Hydrogen) + (molecular mass of Sulphur ) + 4*(molecular mass of oxygen )

Molecular mass of 1 mole of H₂SO₄ = 2*1 + 32 + 4*16 = 98 grams

Mass of 3.6 moles H₂SO₄ = 3.6*98 =352.8 grams

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Answer: there are atoms that either have too many or too few neutrons or protons in their nuclei. This results in an imbalance between the jedi forces holding them together, which leads to an excess of internal energy. Such atoms are said to be unstable or radioactive.

Explanation:

Gas volume at STP was 1.12 10 7 cm3. At STP, the volume for 1 mole per gas is calculated to be 25 litres, followed by the kind of gas and dominant force. Actual gas having a repulsive force of +ve deviation.

V=nRT/P is how this formula is written. V = n R T / P, where V is the gas's volume in L, n is indeed the number of moles, R is the real gases constant, T is indeed the gas' temperature in K, and P is the gas's pressure in atm.

S.T.P. One mole of every gas takes up 22.4 litres of space at typical conditions of temperature and pressure of 0o and 1 atm, respectively. This volume is an approximate value, since the volume of various gases varies significantly. Every gas at S.T.P. has a molar volume of 22.4L.

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Answer:

red beryl

Explanation:

Red Beryls = Density range is 2.63g/cm3 to 2.92 g/cm3

Rubies = Density Range is 3.9 g/cm3 to 4.1 g/cm3

Mass of stone = 4.35 g

Volume of solid = change in water level = 1.5 mL = 1 cm3

Relationship between mass, volume and density is given by;

Density = Mass / Volume

Density = 4.35 / 1.5 = 2.9 g/cm3

The density of the stone falls in the red beryls range hence it is a red beryl.

Answer:

wind and water erosion

Answer:

C is the answer

When we have an acid-base reaction, the acid will be that substance that donates protons, in the form of H+ ions. The base will be the one that accepts the H+ ions. Now, the base that accepts the protons becomes a potential proton donor, thus becoming a conjugate acid. This is the case with H3O+.

H2O accepts H+ ions, so it is a base and when it becomes H3O+ it becomes a potential H+ proton donor, that is, a conjugate acid.

so, the answer will be B. Conjugate acid

Molecular mass of propanoic acid  an isomer of methyl ethanoate. is 74.1 amu or 74.1 g/mol.

Isomers can be defined as molecules with the same number of atoms of the same element but with different structural arrangements and properties.

Since the molecular formulas are the same for isomers, they have the same mass. Methyl ethanoate is an isomer of propionic acid so it has the same mass.

there's two type of isomer, geometric isomers and structural isomers

Geometric isomers are molecules that have the same chemical formula but different atomic arrangements. Geometric isomers have different physical and chemical properties.

An interesting property of geometric isomers is that their groups cannot switch positions independently.

Structural isomers are substances with the same chemical formula but different atomic bonds. Examples of structural isomers are the already mentioned chemicals n-butane and isobutane.

Since the molecular formulas are the same for isomers, they have the same mass.

Methyl ethanoate is an isomer of propionic acid so it has the same mass.

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During this procedure, the blue (CuSO 4) solution turns into a colorless ZnSO 4 solutions. balanced response. Copper sulfate is produced when Zn (s) and CuSO 4 (aq) combine. Sulfated zinc.

The number of variables on either side of a formula is equal in a balanced action. A chemical reaction's atoms, ions, all molecules are represented by a number called the stoichiometric ratio, that balances exact amounts of each element on the product and reactant sides of equation.

One such equation describes an element's total charge and number of atoms in both the products and reactants of a reaction. In other words, the mass and charge of both sides of a reaction are equal.

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Answer:

the answer is copper :)

Explanation:

By analyzing the graph the conclusion that can be derived about the location of an electron in a hydrogen atom that is in the ground state is that the greatest probability of locating electron is at a distance of one Bohr radius from the nucleus.

Generally the Bohr radius is described as a physical constant that is used to represent the most probable distance between the electron and nucleus of a hydrogen atom at its ground state (which is the lowest energy level). The constant's value of Bohr radius is symbolized as a₀, and its value is approximately 5.29177210903(80) x 10⁻¹¹ meters (m).

Hence, the greatest probability of locating electron is at a distance of one Bohr radius from the nucleus.

The graph is given is the image attached below.

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Answer:

Protons = 3

Neutrons = 4

Electrons = 3

Explanation:

For every atom, the atomic number is equal to the number of protons.

In a neutral atom (atom with no charge) the number of protons is equal to the number of electrons.

To calculate neutrons subtract the number of protons (atomic number) from the rounded molar mass:

7 - 3 = 4 neutrons

In Step A, the reagent is NBS with benzoyl peroxide in CCl4 at 80°C.

In Step B, the reagent is NaOC2H5 in C2H5OH at 50°C.

Acne lesions can be effectively treated with benzoyl peroxide. It has no effect on antibiotic resistance.  It can be used with salicylic acid, sulfur, erythromycin, clindamycin, or adapalene (antibiotics) (a synthetic retinoid). Benzoyl peroxide/clindamycin and adapalene/benzoyl peroxide are two frequent combination medicines, with adapalene being a chemically stable retinoid that may be coupled with benzoyl peroxide, unlike Tazarotene and tretinoin.

For the treatment of acne lesions, combination treatments such as benzoyl peroxide/clindamycin and benzoyl peroxide/salicylic acid tend to be somewhat more effective than benzoyl peroxide alone.  In the United States, the combination tretinoin/benzoyl peroxide was authorized for medicinal use in 2021.

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Answer:

2.67 N

Explanation:

The normality equation looks like this:

Normality = Molarity (M) x Number of Equivalents

In this formula, the number of equivalents represents how many moles of the acidic species exist in the molecule. In other words, how many hydrogen atoms are in citric acid? This value would be 8 equivalents (as denoted by the subscript).

So, to find the normality, you need to (1) convert grams C₆H₈O₇ to moles (via molar mass), then (2) calculate the molarity (via molarity equation using moles and volume), and then (3) calculate normality (via normality equation using molarity and # of eq.).

(Step 1)

Molar Mass (C₆H₈O₇): 6(12.011 g/mol) + 8(1.008 g/mol) + 7 (15.998 g/mol)

Molar Mass  (C₆H₈O₇): 192.116 g/mol

128 g C₆H₈O₇             1 mole
----------------------  x  ----------------------  =  0.666 moles C₆H₈O₇
                                   192.116 g

(Step 2)

Molarity = moles / volume (L)

Molarity = 0.666 moles C₆H₈O₇ / 2 L H₂O

Molarity = 0.333 M

(Step 3)

C₆H₈O₇  -----> 8 hydrogen atoms

Normality = molarity x number of equivalents

Normality = 0.333 M x 8

Normality = 2.67 N

Answer:

glucose ethanol and co2

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Answer:

In anaerobic respiration yeast breaks down glucose, forming ethanol and carbon dioxide as its waste products. When the glucose is nearly used up, and provided that oxygen is present, yeast uses the ethanol as a respiratory substrate to produce carbon dioxide and water in aerobic respiration.

Explanation:

Hope it is helpful....

According to the nurse preceptor, the new nurse adheres to a number of safe practices while administering red blood cells (RBCs) to a patient.

Based on the given options, the actions that are deemed safe by the nurse preceptor are:

Using large gauge catheters (20-24 gauge). When giving red blood cells (RBCs) to a patient, the novice nurse follows a number of safe procedures, according to the nurse preceptor. To ensure appropriate flushing and lower the chance of an air embolism, the inexperienced nurse correctly primes the intravenous tube with 0.9% sodium chloride in the first step. The second step is for the inexperienced nurse to collect and record a complete set of baseline vital signs. This creates a baseline for monitoring the client's status both before and after the transfusion. Third, in accordance with the advised duration for safe administration, the nurse modifies the infusion rate to administer the RBCs in 4 hours as opposed to 6 hours. Fourth, the inexperienced nurse employs big gauge catheters (20-24 gauge) to promote quick and smooth blood product flow and reduce problems.

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If a solution has a temperature of 255 k, then its temperature in degrees Celsius is - 18 °C

The temperature is defined as ,

Temperature is the degree of hotness or coldness of a body, measured in degrees Fahrenheit or degrees Celsius.

Calculation ,

The temperature is converted from degree Celsius to kelvin as ,

Let suppose temperature = X °C

Then temperature in kelvin =  X °C  + 273 =  ( X  + 273 ) K

If a solution has a temperature = 255 K

Temperature in degrees Celsius =  255 K - 273 = - 18 °C

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