Determine the specific heat of a metal that has a mass of 34.57 g that absorbs 678 J of heat and is heated from 25.0 °C to 55.0 °C.

Answer:

Explanation:

Givens

The heat capacity for aluminum = 0.89 J/(oC*grams)

The heat capacity for water       = 4.18

m water = 200 grams

t water = 1 degree C

t aluminum = 10 degrees C

Formula

Thermal energy = m * c *   t

Solution

Water

Energy = m * c * t

Energy = 200 * 4.18 * 1

Energy = 836 Joules

Aluminum

Energy = mc t

Energy =100 * 0.89 * 10

Energy = 890

Answer Aluminum has the higher Thermal Energy

Note this is a very tricky question. Usually delta t is given in terms of a change in temperature or heat transfer. This question assumes the substance is at a constant temperature at a short time interval so delta t is a constant amount for that time interval. Be very careful when you think about this, because the laws of thermo dynamics begin to act almost immediately.

Answer:

749 grams CO₂

Explanation:

To find the amount of carbon dioxide produced, you need to (1) convert grams C₃H₈ to moles C₃H₈ (via molar mass from periodic table), then (2) convert moles C₃H₈ to moles CO₂ (via mole-to-mole ratio via reaction coefficients), and then (3) convert moles CO₂ to grams CO₂ (via molar mass from periodic table). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The desired unit should be in the numerator. The final answer should have 3 significant figures because the given value (250. grams) has 3 sig figs.

Molar Mass (C₃H₈): 3(12.01 g/mol) + 8(1.008 g/mol)

Molar Mass (C₃H₈): 44.094 g/mol

1 C₃H₈ + 5 O₂ ---> 3 CO₂ + 4 H₂O

Molar Mass (CO₂): 12.01 g/mol + 2(16.00 g/mol)

Molar Mass (CO₂): 44.01 g/mol

250. g C₃H₈         1 mole C₃H₈           3 moles CO₂              44.01 g
------------------  x  ----------------------  x  ----------------------  x  --------------------  =
                               44.094 g              1 mole C₃H₈            1 mole CO₂

= 749 grams CO₂

40 g glucose

Explanation:

I have to assume that you are asking about a 2% m/v solution ( Note that specifying 2% in isolation has no meaning )

2% m/v glucose solution is : 2 g glucose in 100 mL solution

Which is ( multiply by 10): 2% m/v = 20 g glucose in 1000 mL ( = 1.0 L) solution

And so 2%m/v = 40 g glucose in 2000 mL or 2.0 L solution

Answer: 40 g glucose.

Answer:

mass number=126

Explanation:

57+69=126

Answer:

455 Kcal

Explanation:

2Cl2(g) + 7O2(g) + 130kcal → 2Cl2O7(g)

Rearranging we get,

2Cl2(g) + 7O2(g)  → 2Cl2O7(g) Δ H = 130 kcal . mol⁻¹

So for per mol reaction will be as above.

In case of 7 mols of product, we need 7/2 mole ratio x 130 = 455 Kcal

Gamma decay is a type of radioactive decay that does not change the identity of the isotope.

During gamma decay the nucleus emits radiation without actually changing its composition. In this type of decay only energy is released but the structure is same.

So we can conclude that gamma decay is a type of radioactive decay that does not change the identity of the isotope.

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Answer:

The Antoine's law means that the amount of substance before reaction must be equal the amount of substance after reaction

The equation h2 + cl2 ---> 2hcl correctly models this law.

Answer:

Reaction 2

Explanation:

12/30=0.4g/sec

200/(8*60)=0.41667g/sec

A solution of the ionic salt CaSO₃ would have an acidic pH.

This is referred to power of hydrogen and it measures the degree of acidity or alkalinity of a substance.

CaSO₃  which is referred to as calcium sulfite or calcium salt is formed through the reaction below and has a pH of 6 thereby making it an acidic salt.

SO₂ + CaCO₃ → CaSO₃ + CO₂

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Answer:

Basic

Explanation:

acellus

Answer:

What is the main problem with windmills?

Image result for Guided Practice Old-fashioned windmills are not aerogenerators because

As with all energy supply options, wind energy can have adverse environmental impacts, including the potential to reduce, fragment, or degrade habitat for wildlife, fish, and plants. Furthermore, spinning turbine blades can pose a threat to flying wildlife like birds and bats.

Why are the windmills not moving?

Why do the turbines not spin at times? The most common reason that turbines stop spinning is because the wind is not blowing fast enough. Most wind turbines need a sustained wind speed of 9 MPH or higher to operate. Technicians will also stop turbines to perform routine maintenance or repairs.

Answer:

mining of clay limestone and then heated to a certain temperature of 1450⁰ in a cement kiln

The product that is formed is shown in the figure , Option A is the correct answer , and the highlighted carbons shown corresponds to the carbons from diethyl malonate.

Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products.

Substances are either chemical elements or compounds.

A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Chemical reactions are an integral part of technology, of culture, and indeed of life itself.

The product that is formed is shown in the figure , Option A is the correct answer , and the highlighted carbons shown corresponds to the carbons from diethyl malonate.

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Raft spider's light weight and large surface area allow it to walk on water.

Raft spiders are a specie of siders that can move on the surface of water. They are found around the  north-western and central Europe.

The following apply to the raft spiders;

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The mass of  2.75 ×   [tex]10^{-4}[/tex]moles NaOH will be 1.1 x  [tex]10^{-2}[/tex] grams

Recall that:

Mole = mass/molar mass.

Thus, mass = mole x molar mass.

In this case, the mole is  2.75 × [tex]10^{-4}[/tex] moles and the molar mass of NaOH is 40 g/mol.

Mass =  2.75 ×  [tex]10^{-4}[/tex]x 40 = 1.1 x  [tex]10^{-2}[/tex] grams

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Answer:

Answer is option B or:

1.10 x 10–2 g NaOH

Explanation:

hope this helps! (edge)

Answer:

cuz what we are shown in school often fails to foster curiosity in us.

Explanation:

Explanation:

because it have many laws, theory, reaction and many more which is enough to make a student depressed

All the given species have the same charge except peroxide.

Thus, only peroxide is unique.

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Answer:

um Im not sure what the heck that is

This question involves the concept of excitation energy.

The energy level to which the atom is excited is "4".

The excitation energy of an atom is defined as the energy required by the atom to get excited from one energy level to some upper energy level. Mathematically, it can be given by the following formula:

[tex]E=E_o(\frac{1}{n_i^2}-\frac{1}{n_f^2})[/tex]

where,

E = excitation energy = [tex]\frac{hc}{\lambda} = \frac{(6.63\ x\ 10^{-34}\ J.s)(3\ x\ 10^8\ m/s)}{9.725\ x\ 10^{-8}\ m}=2.04\ x\ 10^{-18}\ J[/tex]

E (in eV) = [tex](2.04\ x\ 10^{-18}\ J)(\frac{1\ eV}{1.6\ x\ 10^{-19}\ J})[/tex] = 12.78 eV

h = plank's constant = 6.63 x 10⁻³⁴ J>s

c = speed of light = 3 x 10⁸ m/s

λ = wavelength = 97.25 nm = 9.725 x 10⁻⁸ m

E₀ = energy of hydrogen atom in ground state = 13.6 eV

[tex]n_i[/tex] = initial orbit = 1

[tex]n_f[/tex] = final orbit = ?

Therefore,

[tex]12.78\ eV=13.6\ eV(\frac{1}{1^2}-\frac{1}{n_f^2})\\\\\frac{12.78\ eV}{13.6\ eV}=1-\frac{1}{n_f^2}\\\\\frac{1}{n_f^2}=1-0.94\\\\n_f^2=\frac{1}{0.06}\\\\n_f=\sqrt{16.67}\\n_f = 4[/tex]

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Answer: 2Na3 (s)-> 2Na (s) +3N2 (g)

Explanation:

look at the keywords then balance equation

The noble gas, Helium has only two electrons with the electronic configuration as 1s2. Hence, it does not have a complete octet. and thus, it doesn't follow the octet rule.

An octet is a set of eight. Atoms of each of the noble gases (except helium) have eight electrons in their highest occupied energy levels and the general electron configuration of ns2np6.

Answer:

1.3 M

Explanation:

The formula mass of lithium fluoride is 7+19=26 g/mol. This means that in 52 grams of LiF, there is 2 moles.

Molarity = (moles of solute)/(liters of solution), so the answer is 2/1.5 = 1.3 M

Answer:

1.788 C DEGREES

Explanation:

STP is 1 atm at  273.15 K

P1V1/T1  = P2V2/T2

(1)(62.65) / (273.15) = (612/760)(78.31)/T2

T2 = 274.93 K     = 1.788 C

Increased air temperatures decrease the salinity of the ocean since more ice is melting adding more fresh water to the oceans, therefore slowing down the great ocean conveyor belt.

Ocean conveyor belt system in which water moves between the cold depths and warm surface in oceans throughout the world.

Increases in temperatures of surrounding entities like ice and an increase in precipitation adds fresh water into the sea, which lower salinity. Seawater with lower salinity is lighter in density and won't sink as much as denser water.

As the seawater gets saltier, its density increases, and it starts to sink. Surface water is pulled in to replace the sinking water, which in turn eventually becomes cold and salty enough to sink. This initiates the deep-ocean currents driving the global conveyer belt.

Hence, option A is correct.

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Organic Compounds are named according to IUPAC Nomenclature technique.

The name for the first structure is 3-Bromo-2,4-dimethylhexane.

"International Union of Pure and Applied Chemistry "

Following are the names of given structures ;

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Answer:

See explanation.

Explanation:

Heavy metal or something else that is heavily disordered. Would still sound better than cardi b.

Answer:

Oxygen is the most abundant element in the Earth's crust.

Explaination: It makes up 46% of the mass of the Earths crust.

Answer

The most abundant elements in the human body are oxygen, carbon and hydrogen. Oxygen makes up 65% of the body.

Answer:

(C3H6)n

it is made up of carbon and hydrogen atoms.