can someone help with this ??

Answer:

pH = 4.45

Explanation:

We need to find the pH of [tex]3.5\times 10^{-5}\ M[/tex] solution of HCl. We know that, pH of a solution is given by :

[tex]pH=-log[H]^+[/tex]

Put all the values,

[tex]pH=-log[3.5\times 10^{-5}]\\\\pH=4.45[/tex]

So, the pH of the solution of HCl is 4.45.

Explanation:

[tex]1000 \: ml \: contain \: 0.750 \: moles \\ 25.00 \: ml \: will \: contain \: ( \frac{25 \times 0.75}{1000} ) \: moles \\ = 0.01875 \: moles \\ from \: reaction \: eqn \\ H _{2} C _{2} 0 _{4} + 2KOH - - > K _{2}C _{2} 0 _{4} +2H _{2} 0 \\ 1 \: mole \: of \: oxalic \: reacts \: with \: 2 \: moles \: of \: KOH \\ 0.01875 \: moles \: react \: with \: ( \frac{0.01875 \times 2}{1} ) \\ = 0.0375 \: moles \\ 0.0375 \: moles \: weigh \: 0.846g \\ 1 \: mole \: weighs \: 56g[/tex]

Answer:

Hello. I'll help

Explanation:

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Answer:

Explanation:

How many moles of solute are in 9.03 M solution with 15.8 L of solution?

Answer:

Human actions cannot change Earth's atmosphere . decrease in Earth's temperature . Although researchers at the polar station have now concluded that global average temperature has increased and that this is causing ice to melt, some scientists initially disagreed that the ice was melting .

Okay! Variability and Regional Differences:

Ice cover, whether it's sea ice, glaciers, or ice sheets, is subject to natural variability. Some scientists argued that the observed decreases in certain regions might be part of a natural cycle rather than a long-term trend. They pointed to historical records and paleoclimatic data, which suggested that ice cover has fluctuated in the past. This led to debates about whether the observed decreases were within the bounds of natural variability or indicative of a broader decline.

Data Limitations and Measurement Techniques:

Obtaining accurate and comprehensive data on ice cover is challenging. Satellite observations, which are crucial for monitoring large-scale ice changes, have limitations in terms of spatial and temporal coverage. Early satellite records had relatively short time spans, making it difficult to discern long-term trends. Additionally, different measurement techniques and instruments might introduce discrepancies in the data, which could lead to varying interpretations.

Discrepancies in Interpretation:

Scientists may differ in their interpretation of the available data due to varying expertise, perspectives, and biases. Some researchers may emphasize specific aspects of the data that align with their hypotheses or theories. This can contribute to differing conclusions about whether overall ice is decreasing or not.

Focus on Localized Increases:

While overall ice cover might be decreasing globally, localized increases in ice could complicate the assessment. For example, some regions might experience temporary gains in ice due to factors such as increased precipitation or changes in atmospheric circulation patterns. These localized increases can lead to debates about the net change in ice cover and its significance.

Publication Bias and Scientific Communication:

The process of scientific publishing can introduce biases. Scientists often publish research findings that deviate from the norm or present novel interpretations, leading to a disproportionate representation of dissenting views. Media coverage might amplify these discrepancies, creating the impression of a more significant scientific disagreement than actually exists.

It is important to note that the scientific consensus has evolved over time, and subsequent research and advancements in observational capabilities have provided clearer evidence of overall ice decline. Numerous scientific studies have since demonstrated a consistent decrease in ice cover across various regions, including Arctic sea ice, glaciers, and ice sheets like Greenland and Antarctica.

Scientists employ a rigorous process of peer review and critical analysis to evaluate research findings, resolve discrepancies, and refine our understanding of complex phenomena like ice decline. The gradual convergence of evidence from multiple sources, improved data quality, and the consensus-building process have led to a clearer understanding that overall ice is indeed decreasing.

It's worth emphasizing that the scientific process is inherently self-correcting, and ongoing research continues to refine our understanding of ice changes and their implications for our planet's climate system.

Answer:hydronium

Explanation:

Answer:

Assume that each of the ions in calcium chloride, CaCl2, has the same effect on the freezing point of water as a nonelectrolyte molecule

Answer:

The correct answer is a

A property of water among the given properties It has a relatively high heat capacity. Hence Option (A) is correct

Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to an object to produce a unit change in its temperature.

The SI unit of heat capacity is joule per kelvin. Heat capacity is an extensive property.

Therefore, A property of water among the given properties It has a relatively high heat capacity. Hence Option (A) is correct.

Learn more about Heat capacity here ;

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Answer:

The rock cycle is driven by two forces: (1) Earth's internal heat engine, which moves material around in the core and the mantle and leads to slow but significant changes within the crust, and (2) the hydrological cycle, which is the movement of water, ice, and air at the surface, and is powered by the sun.

Explanation:

Answer:

Petersburg, Russia), Russian chemist who developed the periodic classification of the elements. Mendeleev found that, when all the known chemical elements were arranged in order of increasing atomic weight, the resulting table displayed a recurring pattern, or periodicity, of properties within groups of elements.

Explanation:

Hope this helps!!!

Answer: The concentration of KOH is 0.1 M.

Explanation:

Given: Mass of KHP = 413 mg (1 mg = 0.001 g) = 0.413 g

Volume of KOH = 20.05 mL

Volume of solution = 41 mL

The molecular mass of KHP is 204.22 g/mol

Hence, moles of KHP are calculated as follows.

[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{0.413 g}{204.22 g/mol}\\= 0.002 mol[/tex]

As molarity is the number of moles of a substance present in a liter of solution.

So, molarity of the given solution is as follows.

[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.002 M}{0.041 L}\\= 0.0493 M[/tex]

When the given solution is titrated with KOH then concentration of KOH is calculated as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]

Substitute the values into above formula.

[tex]M_{1}V_{1} = M_{2}V_{2}\\0.0493 M \times 41 mL = M_{2} \times 20.05 mL\\M_{2} = \frac{0.0493 M \times 41 mL}{20.05 mL}\\= 0.1 M[/tex]

Thus, we can conclude that the concentration of KOH is 0.1 M.

Answer:

Any atom with six protons, regardless of how much other stuff it has, is a carbon atom. Having 7 neutrons, this would be an atom of Carbon 13 (C-13), a stable isotope of carbon making up 1.1% of natural carbon in the atmosphere and near the Earth's surface. As for the electrons, Carbon has six, but atoms may temporarily pick up or lose electrons in the hurly burly of chemical reactions, solar radiation and so forth. This is a negative ion of C13, which will soon pass on its extra election to an atom which needs it (a positive ion).

Explanation:

https://www.quora.com/What-element-has-6-protons-7-neutrons-and-7-electrons

Answer:

A. cell potential.

Explanation:

Hello there!

In this case, according to the Nerst equation:

[tex]Ecell=E\°cell-\frac{0.0592}{n}log(Q)[/tex]

We can say that at equilibrium Ecell=0 and Q=K, so:

[tex]0=E\°cell-\frac{0.0592}{n}log(K)[/tex]

In such a way, we can solve for K as follows:

[tex]log(K)=\frac{nE\°cell}{0.0592}\\\\K=10^{\frac{nE\°cell}{0.0592}}[/tex]

Thus, we infer that E° in this equation is A. cell potential.

Regards!

Answer: The new volume of the balloon is 197.31 L.

Explanation:

Given: [tex]V_{1}[/tex] = 38.5 L,        [tex]T_{1} = 8^{o}C[/tex]

[tex]V_{2}[/tex] = ?,                     [tex]T_{2} = 41^{o}C[/tex]

According to Charles law, at constant pressure the volume of a gas is directly proportional to temperature.

Formula used to calculate the new volume is as follows.

[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]

Substitute the values into above formula as follows.

[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\\frac{38.5 L}{8^{o}C} = \frac{V_{2}}{41^{o}C}\\V_{2} = \frac{38.5 L \times 41^{o}C}{8^{o}C}\\= 197.31 L[/tex]

Thus, we can conclude that the new volume of the balloon is 197.31 L.

Answer:

I'm not sure,

Explanation:

Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day!

Answer:

Na3PO4+3HCl —> H3PO4+3NaCl

The reaction type for this equation is a double displacement or acid-base reaction, where Na₃PO₄ and HCl exchange ions to form H₃PO₄ and NaCl.

A double displacement reaction is a type of chemical reaction in which the cations and anions of two different compounds exchange places, producing two new compounds. Double displacement reactions are also known as double replacement, metathesis, or ion-exchange reactions.

To balance the equation, you need to make sure that the number of atoms of each element is equal on both sides of the equation. Here is one possible balanced equation:

2Na₃PO₄+ 6HCl → 2H₃PO₄ + 6NaCl

In this balanced equation, there are:

6 sodium atoms (Na) on both sides

2 phosphorus atoms (P) on both sides

12 oxygen atoms (O) on both sides

6 hydrogen atoms (H) on both sides

Note that you can also write the equation in terms of formulas instead of names:

Na₃PO₄ + 3HCl → H₃PO₄ + 3NaCl

Both equations represent the same chemical reaction, but the second one is more concise.

Find more on double displacement reactions:

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Answer: [tex]m=0.1625\ kg,\ ,V=125\ L[/tex]

Explanation:

Given

The length of the box is [tex]a=0.5\ m[/tex]

1 liter of air has a mass of 1.3 gm

So, the density of air is [tex]1.3\ g/L[/tex]

The volume of the box is

[tex]\Rightarrow a^3=0.5^3\\\Rightarrow 0.125\ m^3\ or\ 125\ L[/tex]

Mass of air in the box is

[tex]\Rightarrow m=\rho \times V\\\Rightarrow m=1.3\times 125\\\Rightarrow m=162.5\ gm\ or\ 0.1625\ kg[/tex]

Answer:

I don't speak espanol

Explanation:

hdhdbdbdbsnsnsndndndnd

Answer:

No, it is not naturally occuring because it is man-made.

Answer:

a thermal conductor

Explanation:

thats what its called

Answer:

Hydrochloric acid + zinc = zinc chloride + hydrogen gas

sulfuric acid + magnesium oxide = zinc sulfate + water

nitric acid + lead carbonate = Lead nitrate + carbon dioxide

Sorry can't remember how to do the last one :(

Explanation:

Explanation:

1) Thermal and Electric conductivity

2) Metallic strength

Answer: The average kinetic energy of water at [tex]25^{o}C[/tex] is [tex]1.233 \times 10^{-26} J[/tex].

Explanation:

Given: Temperature = [tex]25^{o}C = (25 + 273) K = 298 K[/tex]

Kinetic energy is the energy acquired by the molecules of a substance due to its motion.

Formula to calculate average kinetic energy is as follows.

[tex]K.E = \frac{3}{2}kT[/tex]

where,

T = temperature

k = Boltzmann constant = [tex]1.38 \times 10^{-23} J/K[/tex]

Substitute the value into above formula as follows.

[tex]K.E = \frac{3}{2}kT\\= \frac{3}{2} \times 1.38 \times 10^{-23} J/K \times 298 K \\= 1.233 \times 10^{-26} J[/tex]

Thus, we can conclude that the average kinetic energy of water at [tex]25^{o}C[/tex] is [tex]1.233 \times 10^{-26} J[/tex].

Explanation:

The purpose of this seven-page lab report is to use simple and fractional distillation to purify volatile liquids. The boiling points were obtained from the distillate collected drops and the efficiency of the two methods of purification were compared. The introduction experiment, data, conclusion

Answer:

The answer is "6.52 kg and 13.1 kg"

Explanation:

For point a:  

[tex]Actual\ yield = 6.52 \ kg\\\\Percent \ yield= 66\%\\\\Percent \ yield = \frac{Actual \ yield}{Theoretical\ yield} \times 100 \%\\\\Theoretical\ yield \ of \ MnO_2 = \frac{Actual \ yield}{Percent \ yield} \times 100\%\\\\=\frac{6.52 \ kg}{66 \%} \times 100\% =9.88 \ kg\\\\[/tex]

Equation:  

[tex]3MnCO_3 +O_2 \longrightarrow 2MnO_2 + 2CO_2\\\\[/tex]

Calculating the amount of [tex]MnCO_3[/tex]

[tex]= 9.88 \ kg \times \frac{1000 \ g}{1 \ kg} \times \frac{1 \ mol \ MnO_2}{86.94 \ g} \times \frac{2 \ Mol \ MnCO_3}{2 \ mol \ MnO_2} \times \frac{114.95\ g}{1 \ mol \ MnCO_3 }\times \frac{1\ kg}{1000\ g}\\\\= 13.1 \ kg[/tex]

For point b:

[tex]Actual\ yield = 4.0 \ kg\\\\Percent\ yield=97.0\%\\\\Percent \ yield = \frac{Actual \ yield}{Theoretical \ yield} \times 100 \% \\\\Theoretical \ yield\ of\ Mn = \frac{Actual \ yield}{Percent \ yield} \times 100\%\\\\[/tex]

[tex]=\frac{4.0 \ kg}{97.0\%} \times 100\% =4.12 \ kg[/tex]

Equation:  

[tex]3MnO_2 +4AL \longrightarrow 3Mn + 2AL_2O_3\\\\[/tex]

Calculating the amount of [tex]MnO_2:[/tex]  

[tex]= 4.12 \ kg \times \frac{1000 \ g}{1 \ kg} \times \frac{1 \ mol \ Mn}{54.94 \ g} \times \frac{3 \ Mol \ MnO_2}{3 \ mol \ Mn} \times \frac{86.94 \ g}{1 \ mol \ MnO_2 }\\\\= 6516 \ g \\\\=6.52 \ kg\\\\[/tex]

Answer:

This question is obviously true

Explanation:

I would expect

Answer:

2.44 L

Explanation:

Step 1: Write the balanced equation

2 Ca + O₂ ⇒ 2 CaO

Step 2: Calculate the mass of O₂ required to form 11.2 g of CaO

The molar mass of O₂ is 32 g/mol and in the balanced reaction, there is 1 mole of O₂, that is, 1 mol × 32 g/mol = 32 g.

The molar mass of CaO is 56 g/mol and in the balanced reaction, there are 2 moles of CaO, that is, 2 mol × 56 g/mol = 112 g.

11.2 g CaO × 32 g O₂/112 g CaO = 3.2 g O₂

Step 3: Calculate the volume occupied by 3.2 g of O₂

Under the conditions of the task, 32 g of O₂ occupy 24.4 L.

3.2 g × 24.4 L/32 g = 2.44 L

Answer: The net ionic equation when formic acid and sodium benzoate are mixed is as follows.

[tex]HCOOH + C_{6}H_{5}COO^{-}Na^{+} \rightarrow HCOONa + C_{6}H_{5}COOH[/tex]

Explanation:

A chemical equation in which both reactants and products are present in the form of ions is called an ionic equation.

The chemical formula of formic acid is HCOOH and chemical formula of sodium benzoate is [tex]C_{6}H_{5}COONa[/tex].

Therefore, net ionic equation when formic acid and sodium benzoate are mixed is as follows.

[tex]HCOOH + C_{6}H_{5}COO^{-}Na^{+} \rightarrow HCOONa + C_{6}H_{5}COOH[/tex]

Answer: the c thingy is where you be like burgundy sauce then be like racial slair is what it mean's so the name thingy

Explanation: