4.55 Classify the following redox reactions. (a) 2H2O2 ⟶ 2H2O + O2 (b) Mg + 2AgNO3 ⟶ Mg(NO3)2 + 2Ag (c) NH4NO2 ⟶ N2 + 2H2O (d) H2 + Br2 ⟶ 2HBr

Answer:

✔ habitat destruction

Explanation:

the 3 reasons are:

hunting

habitat loss

introduced predators

summed up its habitat destruction

From the statement and the information available in the question, the pH of the solution is 12.2.

The term Ka refers to the acid dissociation constant of a substance, we can obtain this by setting up the ICE table as shown;

       C6H5O^-  +   H2O ⇄  C6H5OH + OH^-

I         0.250                           0                0

C         -X                                +X             +X

E      0.250 -x                         x                x

Now;

Kb = 1 * 10^-14/ 1.0 x 10-10

Kb = 1 * 10^-4

Kb = [C6H5OH] [OH^-]/[C6H5O^-]

1 * 10^-4 = x^2/ 0.250 -x

1 * 10^-4 (0.250 -x) = x^2

2.5 * 10^-4 - 1 * 10^-4 x = x^2

x^2 + 1 * 10^-4 x  - 2.5 * 10^-4 = 0

x=0.016 M

Given that; [C6H5OH] = [OH^-] =x

pOH = -log(0.016 M) = 1.8

pH = 14 - 1.8 = 12.2

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Answer:

1124.2

Explanation:

just easy mathamatics

Answer:

try doing a math problem it may help

Explanation:

Answer:

9 gram of H2O can be produced

Answer:

Gyanendra of Nepal

Answer:

Without angiosperms, average annual rainfall in the area declined by 300 millimeters. In the eastern Amazon basin, the length of the wet season decreased by nearly 3 months. The extent of the wettest rainforests, which receive more than 100 millimeters of rain per month, shrank by 80%.

Answer:

the spiral type of galaxy

Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy. Therefore, the correct option is option C.

The Milky Way constellation is indeed a huge spiral formation containing hundreds of trillions of stars, along with the Sun. the irregularly formed belt of stars and gas clouds visible from Earth that spans the sky. despite the reality that Earth is positioned within the Milky Way constellation, astronomers do not completely understand its nature, despite its proximity with other external star systems.

A dense layer of interstellar dust obscures the majority of the Galaxy from optical observatories, and astronomers can only understand its massive building with the assistance of radio and infrared telescopes, which can detect the forms of light that may travel through the obscuring material. Our earth is situated in the Milky Way galaxy. The Milky Way galaxy is a spiral galaxy.

Therefore, the correct option is option C.

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Answer:

[tex] \boxed{ \sf \: m = 1.866 \: grams}[/tex]

Explanation:

Given:

Change in temperature ∆T= -74.14°C

Heat(Energy) released Q= 578.7 joules

Specific heat capacity s = 4.184 J/(g·°C)

To find:

Mass of the sample (m)=?

Solution:

[tex] \sf s= \frac{Q}{m \cdot \Delta T} \\ \sf \: Substituting \: the \: given \: parameters \\ \sf 4.184 = \frac{578.7}{m \times ( - 74.14)} \\ \sf m = \frac{578.7}{4.184 \times ( - 74.14)} \\ \sf m = \frac{578.7}{310.20176} \\ { \sf m = 1.8655 \approx1.866 \: grams}[/tex]

Since, we need the answer in 4 significant figures,

[tex] \boxed{ \sf \: m = 1.866 \: grams}[/tex]

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Answer:

D. carbonyl

Explanation:

Answer:

1 molecule of Ca(NO3)2 has 6 oxygen atoms.

Explanation:

It is the unit of work or energy

A 3979 mL flask is occupied by 5.26 g of a gas with a molar mass of 36.02 g/mol at 1.07 atm and 81.7 °C.

An ideal gas is that whose behavior can be explained using the ideal gas laws.

We will use the following expression.

K = °C + 273.15 = 81.7 + 273.15 = 354.9 K

We will use the ideal gas equation.

P × V = n × R × T

n = P × V / R × T

n = 1.07 atm × 3.979 L / (0.08206 atm.L/mol.K) × 354.9 K = 0.146 mol

The molar mass of the gas is 36.02 g/mol.

0.146 mol × 36.02 g/mol = 5.26 g

A 3979 mL flask is occupied by 5.26 g of a gas with a molar mass of 36.02 g/mol at 1.07 atm and 81.7 °C.

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Ideal gas law:  PV = nRT

Write down what you know and what you want to fine:

P = pressure = ?

V = volume in liters = 0.950 L

n = moles = 727.2 g x 1 mol CH4 / 16 g = 45.45 moles

R = gas constant = 0.0821 Latm/Kmol

T = temperature in K = 221.9K

Solve for P:

P = nRT/V = (45.45)(0.0821)(221.9) / 0.950

P = 872 atm (3 sig. figs. based on 0.950 L having 3 s.f.)

Answer:

In the following reaction, how many moles of

CO2

can be made by reacting 0.50 moles of

CH4

with excess oxygen?

CH4+O2>CO2+H2O

Explanation:

For cigarette lighters containing liquid butane, C4H10, the quantity of heat produced  is mathematically given as

q= -49.2 KJ

Generally, the equation for the Chemical reaction   is mathematically given as

C₄H₁₀(l) + 6.5 O₂(g)---->4 CO₂(g) + 5 H₂O(l)

Therefore

dH°r = .(-393.5 ) + 5.(-285.5] - [1.(-147.6 )+6.5.

dH°r = -2853.9 kJ/mol

In conclusion, No.of mole

Nm = 1g/58g/mol

Nm= 0.01724mol

Hence, Heat of combustion

q = dH°r x moles

q = -2853.9 ×0.01724

q= -49.2 KJ

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Answer:

I would say 4.) Biomass

Explanation:

This looks like the best possible answer because it is plant based. Worst case scenario we could run out of plants. In comparison, wind will pretty much always be around along with wave/tidal power and solar.

Answer:

b) Li2S(aq)+Pb(NO3)2(aq)

e) K2S(aq)+Sn(NO3)4(aq)

Explanation:

they are the only two of the options that contain a sulfide ion (S) therefore they are the only ones that could be considered in the question.

b) Li2S(aq)+Pb(NO3)2(aq)

e) K2S(aq)+Sn(NO3)4(aq)

Answer: I believe its 1 but i'm not sure

Explanation:

Answer:

B

Explanation:

From the given chemical equation, we want to determine the mass of arsenic necessary to produce 15.0 mL of 0.0852 M H₂AsO₄⁻.

Find the amount of moles present in 15.0 mL of 0.0852 M H₂AsO₄⁻ solution. Recall that M = mol/L:

[tex]\displaystyle 15.0\text{ mL} \cdot \frac{0.0852\text{ mol H$_2$AsO$_4^-$}}{1\text{ L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} = 0.00128\text{ mol H$_2$AsO$_4^-$}[/tex]

With stoichiometric ratios and molecular weights, determine the mass of arsenic necessary:

[tex]\displaystyle 0.00128 \text{ mol H$_2$AsO$_4^-$} \cdot \frac{8\text{ mol As}}{3\text{ mol H$_2$AsO$_4^-$}}\cdot \frac{74.92\text{ g As}}{1\text{ mol As}} = 0.256\text{ g As}[/tex]

In conclusion, the answer is B.

The third picture is the answer

Explanation:

there are 2 hydrogen atom 1 oxygen

Answer:

eight

Explanation:

That means there are 12 electrons in a magnesium atom

hope this helps

Answer:

120 calories

Explanation:

Calories and nutrition for world population. One tablespoon of palm oil has 120 calories and 13.6 grams of fat. What does it tell you? Of the 13.6 grams of fat in a tablespoon of palm oil, 6.7 grams are saturated and 6.3 grams are unsaturated.

Answer:

a. <1.0

b. 1.30

c. 3.00

d. 11.00

e. 12.70

Answer:

=3 means is 3 or greater so that would be f and g subshells

=0 means is 0 or greater so that would be s, p, d, f and g subshells

=1 means is 1 or greater so that would be p, d, f, and g subshells

=4 means is 4 or greater so that would be g only

Answer:

acid-base neutralization

Explanation: When a base and acid react, it neutralizes the substance making it a neutral substance, which is water and a salt

Answer:

(A) Nickels and pennies

Answer:

A binary ionic compound contains an ion that is a metal (cation) and an ion that is a nonmetal (anion).

Explanation:

Tell me if its wrong