6 of 30
Beth carried out an energy
experiment and her write-up is
shown below. Use the write-up to
work out the energy transferred in
joules by oil 1.
Enter a number
I wanted to find out which of three cooking oils contained the most energy.
Method
I weighed a spirit burner containing the first oil.
I put 100g of water in a beaker and measured the start temperature of the water.
I lit the spirit burner and used it to heat the water for about a minute.
I then measured the temperature again and re-weighed the spirit burner.
I repeated exactly the same method for the other two oils.
Starting mass of spirit burner (g)
Final mass of spirit burner (g)
Results
My results are shown in the table.
The following equations can be used to work out the energy released:
Energy transferred in joules = mass of water in g x 4.2 x temperature change in °C
Energy released per gram of oil = energy transferred
mass of fuel burned
Starting temperature (°C)
Final temperature (°C)
Oil 1
4✔ 80%
136.2
134
170
28.0
Oil 2
1415
140.5
J
18.5
26.5
Oil 3
138.7
137
175
32.5

A helical section that moves dramatically when NTP (nucleoside triphosphate) is bound is called the "P-loop". P-loop NTPases are a family of proteins that hydrolyze NTPs, and the conformational change in the P-loop region is a critical step in the catalytic cycle of these proteins.

The P-loop is named after the conserved motif (GxxxxGKS/T) that forms the base of the loop and interacts with the phosphate groups of the NTP substrate. When NTP is bound, the P-loop undergoes a conformational change that results in the formation of a catalytic site for NTP hydrolysis. Therefore, the P-loop is a key structural element in the function of P-loop NTPases.

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Answer:

214.77 g/mol

Explanation:

Tin(II) sulfate

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Tin(II) sulfate

Tin(II) sulfate crystallizes in an heavily distorted barium sulfrate structure.

Unit cell of tin(II) sulfate.

Names

Other names

Stannous sulfate

Identifiers

CAS Number  

7488-55-3 ☑

3D model (JSmol)  

Interactive image

ChemSpider  

21106484 ☑

ECHA InfoCard 100.028.457 Edit this at Wikidata

EC Number  

231-302-2

PubChem CID  

62643

UNII  

0MFE10J96E ☑

CompTox Dashboard (EPA)  

DTXSID20884389 Edit this at Wikidata

InChI[show]

SMILES[show]

Properties

Chemical formula SnSO4

Molar mass 214.773 g/mol

Appearance white-yellowish crystalline solid

deliquescent

Density 5.15 g/cm3

Melting point 378 °C (712 °F; 651 K)

Boiling point decomposes to SnO2 and SO2

Solubility in water 33 g/100 mL (25 °C)

Structure[1]

Crystal structure Primitive orthorhombic

Space group Pnma, No. 62

Lattice constant  

a = 8.80 Å, b = 5.32 Å, c = 7.12 Å[2]

Hazards

NFPA 704 (fire diamond)  

NFPA 704 four-colored diamond

010

Flash point Non-flammable

Lethal dose or concentration (LD, LC):

LD50 (median dose) 2207 mg/kg (oral, rat)

2152 mg/kg (oral, mouse)[3]

Related compounds

Other anions Tin(II) chloride, tin(II) bromide, tin(II) iodide

Other cations Lead(II) sulfate

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Tin(II) sulfate (SnSO4) is a chemical compound. It is a white solid that can absorb enough moisture from the air to become fully dissolved, forming an aqueous solution; this property is known as deliquescence. It can be prepared by a displacement reaction between metallic tin and copper(II) sulfate:[4]

Sn (s) + CuSO4 (aq) → Cu (s) + SnSO4 (aq)

Tin(II) sulfate is a convenient source of tin(II) ions uncontaminated by tin(IV) species.

In this question, we need to find the value of pressure of a 15 grams sample of CO2 gas, and in order to find this value, we will be using the Ideal gas law formula, which is the following:

PV = nRT

Where:

P = pressure in atm

V = volume in liters, 20 Liters

n = number of moles

R = gas constant, 0.082

T = temperature in kelvin, 0°C = 273 K

The number of moles we need to find based on the mass in the question and based on the molar mass of CO2, 44g/mol:

44g = 1 mol

15g = x moles

44x = 15

x = 15/44

x = 0.34 moles of CO2 in 15 grams

Now we have the values to add to the formula:

P * 20 = 0.34 * 0.082 * 273

20P = 7.61

P = 7.61/20

P = 0.38 atm of pressure

The pressure will be 0.38 atm

Answer:

they are funny and unite.

Thank You

A LOAEL is defined as the lowest dose that demonstrates a significant increase in an observable adverse effect. The term LOAEL stands for "Lowest Observed Adverse Effect Level."

When testing chemicals and other substances for toxicity, the goal is to determine the concentration or dose at which adverse effects begin to appear. The LOAEL is the lowest dose at which an adverse effect is observed. This value can be used to establish a safe level of exposure to a substance.
To determine the LOAEL, a series of tests are conducted in which different doses of the substance being tested are administered to test animals. The animals are observed for any adverse effects, such as changes in behavior, weight loss, or organ damage. The lowest dose at which an adverse effect is observed is the LOAEL.
It is important to note that the LOAEL is a relative measure of toxicity. It only provides information on the dose at which an adverse effect is first observed and not on the severity of the effect. In addition, the LOAEL may vary depending on the species tested and other factors.
In summary, the LOAEL is the lowest dose at which an observable adverse effect is detected. This value is used to establish a safe level of exposure to a substance.

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Answer:

Sea ice

Explanation:

Sea ice has a much higher albedo compared to other Earth surfaces

i) A is to B: hypoosmotic (Solution A has a lower osmolarity compared to Solution B). ii) B is to A: hyperosmotic (Solution B has a higher osmolarity compared to Solution A)

iii) A is to C: isosmotic (Solution A and Solution C have the same osmolarity)

iv) C is to A: isosmotic (Solution C and Solution A have the same osmolarity)

When you drink water, the osmolarity of body fluids will decrease. This is because water is a hypotonic solution compared to body fluids.

Hypotonic refers to a solution that has a lower solute concentration compared to another solution or a reference solution. In a hypotonic solution, there is a higher concentration of water molecules relative to solute particles.

By drinking water, you are diluting the solute concentration in the body, leading to a decrease in osmolarity. Therefore, the values related to osmolarity, such as the concentration of solutes in the body fluids, would decrease.

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Answer: SnO2 + 2 H2 = Sn + 2 H2O

Explanation: I used a balance equation website. It's called WebQC if you want to check it out for future help.

Answer:

9.83 grams

Explanation:

The balanced chemical equation for the reaction between hydrogen gas (H2) and nitrogen gas (N2) to form ammonia (NH3) is:

N2 + 3 H2 → 2 NH3

From the balanced equation, we can see that the stoichiometric ratio of H2 to NH3 is 3:2. This means that for every 3 moles of H2 used, 2 moles of NH3 are produced.

To determine the amount of NH3 that can be produced from 3.50 grams of H2, we first need to convert the mass of H2 to moles using its molar mass:

Molar mass of H2 = 2.02 g/mol (atomic mass of H) x 2 = 4.04 g/mol

Moles of H2 = Mass of H2 / Molar mass of H2

Moles of H2 = 3.50 g / 4.04 g/mol

Moles of H2 = 0.866 moles

Using the mole ratio between H2 and NH3, we can calculate the theoretical yield of NH3:

N2 + 3 H2 → 2 NH3

3 mol H2 / 2 mol NH3 = 0.866 mol H2 / x mol NH3

x = (2/3) x 0.866 = 0.577 moles NH3

Therefore, the theoretical yield of NH3 is 0.577 moles.

To convert this to grams of NH3, we can use its molar mass:

Molar mass of NH3 = 14.01 g/mol (atomic mass of N) + 3(1.01 g/mol) (atomic mass of H) = 17.03 g/mol

Mass of NH3 = Moles of NH3 x Molar mass of NH3

Mass of NH3 = 0.577 mol x 17.03 g/mol

Mass of NH3 = 9.83 g (rounded to two decimal places)

Therefore, if 3.50 grams of H2 react, the maximum mass of NH3 that can be produced is 9.83 grams.

Answer:

they be Cappin like a mf

Explanation:

tell the truth mf

I think the answer is 10!

Answer:The answer is group 1 and alkali metals

Explanation:The elements in group one are alkali metals and have 1 valance electron

The reaction between zinc and acetic acid is classified as a single displacement reaction. This type of reaction is characterized by the replacement of an atom or a group of atoms of a compound by another atom or group of atoms.

The balanced chemical equation for the reaction between zinc and acetic acid is as follows:
Zn + 2CH₃COOH → Zn(CH₃COO)₂ + H₂

In general terms, during a single displacement reaction, an element replaces another element in a compound. This type of reaction occurs when an element that is more reactive than the one already present in a compound is introduced. For example, in the reaction between zinc and acetic acid, zinc is more reactive than hydrogen and, therefore, replaces hydrogen in acetic acid.

An example of a type of element and a type of compound that are likely to participate in a single displacement reaction is sodium and hydrochloric acid. Sodium is more reactive than hydrogen and can replace hydrogen in hydrochloric acid. The balanced chemical equation for the reaction between sodium and hydrochloric acid is as follows:
2Na + 2HCl → 2NaCl + H₂

In conclusion, the balanced equation for the reaction between zinc and acetic acid is Zn + 2CH₃COOH → Zn(CH₃COO)₂ + H₂, and this reaction is classified as a single displacement reaction. During this type of reaction, an element replaces another element in a compound. An example of a type of element and a type of compound that are likely to participate in this type of reaction is sodium and hydrochloric acid.

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Answer:

1039.482

Explanation:

Answer: The ionization energy trend on the periodic table is highest to the right and upper corner

Explanation:

Ionization energy in the periodic table tends to increase from bottom to top within a group and from left to right across a period. This trend can be understood in the context of atomic structure and electron configurations.

From top to bottom within a group, the principal quantum number (n) increases, signifying that orbitals are being added which are on average further from the nucleus. With the outermost electrons being further away, their attraction to the nucleus decreases, making them easier to remove. This situation correlates with lower ionization energy, due to the increased distance reducing the energy required to ionize the atom.

From left to right across a period, the number of protons in the nucleus increases while the number of electrons in the inner, lower-energy shells remains constant. This leads to a rise in the effective nuclear charge experienced by the valence electrons - the combined effect of the protons in the nucleus and the charges on the inner, core electrons. As a result, valence electrons are held more tightly, causing the atom to decrease in size (as reflected in the atomic radius). Consequently, removing these electrons becomes more challenging, and the ionization energy increases.

Therefore the ionization energy tends to be highest towards the upper right corner of the periodic table with some exceptions depending on the electron configurations.

The specific gravity of urine is a measure of the concentration of dissolved particles in the urine. These particles include salts, minerals, and waste products, among others. The specific gravity of urine varies depending on factors such as fluid intake, diet, and health status.

When fluid intake is normal, the specific gravity of urine should be between 1.010 and 1.025. This range reflects a healthy balance of hydration and waste elimination. If the specific gravity is lower than 1.010, it may indicate that the person is overhydrated or has a condition that affects the kidneys' ability to concentrate urine. On the other hand, if the specific gravity is higher than 1.025, it may indicate dehydration, a high-protein diet, or a condition that affects the kidneys' ability to dilute urine.

It is important to note that specific gravity measurements are not definitive and should be interpreted in conjunction with other clinical data. For example, if a person has a high specific gravity but no symptoms of dehydration, further tests may be needed to determine the cause. Similarly, a person with a low specific gravity may need additional tests to rule out kidney disease or other conditions.

In conclusion, when fluid intake is normal, the specific gravity of urine should be between 1.010 and 1.025. However, specific gravity measurements should be interpreted in the context of other clinical data to accurately assess a person's health status.

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Answer:

Difference in temperature.

Explanation:

Conduction is the movement of heat energy through a substance or from one substance to another by direct contact of atoms and molecules. Heat moves directly from one molecule to another. The heat energy speeds up the movement of the atoms and they collide with other molecules setting them into faster motion.

Answer:

A. Barium

Explanation:

hope this helps! :)

Answer:

D

Explanation:

( I hope that this helps )

Answer:

The answer is d

Explanation:

The formula of this cobalt oxide is CoO₂, and the reduction equation is  CoO₂ => Co + 4e⁻.

Reduction is the chemical manner wherein a species profits electrons or loses oxygen. this is in particular used for extracting irons from ores. Ans: discount is located in our activity, and respiration is one instance. Reduction is a day-to-day discount as it refers to the day-to-day addition of electrons, which results in a reduction in the oxidation number daily.

calculation:-

mass of cobalt oxide CoO = 0.83

after reducing to cobalt metal, mass =  0.59g.

mass of oxygen = 0.24

The formula of this oxide = CoO₂

An equation for the reduction of this oxide.

CoO₂ => Co + 4e⁻

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Answer:  Hello!

first i believe we need a balanced equation to start...

i got 2H2 + 1O2 = 2H2O

This tells us that we need 2 moles of H2 for every 1 mole of O2 Since we only have 1 mole of H2 compared to the 5 moles of O2 hydrogen is the limiting reagent. For illustration, divide the balanced equation by 2 in order to get 1 mole of H2 If we start with 1.0 moles of H2 we'll produce 1.0 mole of H2O

Your welcome <3

Explanation:

HClO will not dissociate completely in water among the given option.

When acids dissolve in water, they can dissociate into ions. Strong acids dissociate completely, while weak acids only partially dissociate. To determine which acid will not dissociate completely, we need to identify the weak acid among the options.

HClO is a weak acid known as hypochlorous acid. It does not dissociate completely in water. Instead, it partially dissociates into H⁺ and ClO⁻ ions.

On the other hand, HCl, HClO₄, and HNO₃ are strong acids and dissociate completely in water, producing H⁺ ions. These strong acids are considered to be fully ionized in aqueous solutions.

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Answer: a mercury thermometer is better to measure very small changes in temperature

Explanation:

i took the test and got it right

Answer:

the answer is C, a mercury thermometer is better to measure very small changes in temperature.

Explanation:

i just took the test and it was correct :)

Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9. The basicity constant, or Kb, is a measure of the strength of a base in a particular chemical reaction. The products of a reaction of a weak base and water with the corresponding acid determine the base constant.

For example, for a given acid and base, Kb1 and Kb2 are the basicity constants for the first and second base dissociations, respectively, of the base. The formulas and charges of the conjugate acid and base, as well as the acid dissociation constants, Ka1 and Ka2, are needed to calculate Kb1 and Kb2.

The following reactions are balanced chemical reactions that represent the dissociation of succinic acid:

Reaction 1: H2C4H4O4(aq) + H2O(l) ⇌ HC4H4O4(aq) + H3O+(aq) Ka1 = 6.2 × 10−5
Reaction 2: HC4H4O4(aq) + H2O(l) ⇌ C4H4O42-(aq) + H3O+(aq) Ka2 = 2.3 × 10−6

The values of Ka1 and Ka2 can be used to calculate Kb1 and Kb2, respectively, using the following equation:

Ka1 × Kb1 = Kw

where Kw is the ion-product constant for water, which is 1.0 × 10−14 at 25°C.

Kb1 can be calculated as follows:

Kw = Ka1 × Kb1

Kb1 = Kw / Ka1

Kw = 1.0 × 10^-14

Ka1 = 6.2 × 10^-5

Kb1 = Kw / Ka1

Kb1 = 1.0 × 10^-14 / 6.2 × 10^-5

Kb1 = 1.61 × 10^-10

Kb2 can be calculated using the same method:

Kw = Ka2 × Kb2

Kb2 = Kw / Ka2

Kw = 1.0 × 10^-14

Ka2 = 2.3 × 10^-6

Kb2 = Kw / Ka2

Kb2 = 1.0 × 10^-14 / 2.3 × 10^-6

Kb2 = 4.35 × 10^-9

Therefore, Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9.

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Answer:

I know one reason is because he claimed God speaks to him. (In which was was correct)

Explanation:

H2O:

2 H2O shows 2 atoms of hydrogen. The number 2 in front of it means 2 moles of H2O

----------

CHA:

It only shows 1 atom of hydrogen

1 CHA means 1 mole of CHA

2 CHA means 2 moles of CHA

----------

HO2:

It only shows 1 atom of hydrogen

---------

H2SO4:

It shows 2 atoms of hydrogen

Answer:

H2O

H2SO4

The new volume of the balloon at 17°C and 0.8 atm is approximately 434.5 mL.

The combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law.

It is expressed as:

\(\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\)

Given that:

Plug the given values into the combined gas law formula and solve for the final volume.

\(\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\\P_1V_1T_2 = P_2V_2T_1\\\\V_2 = \frac{P_1V_1T_2}{P_2T_1} \\\\V_2 = \frac{1.0atm\ *\ 350mL\ * \ 290.15K}{0.8atm\ *\ 292.15K } \\\\V_2 = 434.5\ mL\)

Therefore, the final volume is approximately 434.5 mL.

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