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3 years ago

Which of the following is the coldest climate zone?

Chemistry

2 answers:

Phantasy [73]3 years ago

7 0

Answer:

Polar zone

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dolphi86 [110]3 years ago

6 0

Answer: polar
explanation:

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The gas in an aerosol can is at a pressure of 3.16 atm at 32.2°C. What would the gas pressure in the can be at 22.9°C?

olasank [31]

Answer:

The pressure of the gas would be 3.06 atm

Explanation:

Amonton's law states that the pressure is directly proportional to the absolute temperature of a gas under constant volume. The equation is:

P1 / T1 = P2 / T2

Where P1 is the initial pressure = 3.16atm

T1 is initial absolute temperature = 273.15 + 32.2°C = 305.35K

P2 is our incognite

And T2 is = 273.15 + 22.9°C = 296.05K

Replacing:

3.16atm / 305.35K = P2 / 296.05K

3.06 atm = P2

<h3>The pressure of the gas would be 3.06 atm</h3>

5 0

3 years ago

Explain how you would calculate the q for warming 100.0 grams of liquid water from 0°C to 100 °C.

mojhsa [17]

Answer:

mass = 100 g

T1 = 0°C

T2 = 100 °C

C = 1 cal/g°C

Q = mC(T2 -T1)

Q = 100(1)(100 - 0)

Q = 100(100)

Q = 10000 cal

Explanation:

6 0

3 years ago

Part 1: Name the type of chemical reaction that occurs when calcium hydroxide (Ca(OH)2) reacts with nitric acid (HNO3).

liberstina [14]

Answer:

For 1: Neutralization reaction

For 2: Zinc is more reactive than lead and less reactive than calcium.

Explanation:

For (1):

When a base reacts with an acid to form a salt and water molecule, it is known as a neutralization reaction. The general equation follows:

$HX+BOH\rightarrow BX+H_2O$

The chemical equation for the reaction of calcium hydroxide and nitric acid follows:

$Ca(OH)_2(aq)+2HNO_3(aq)\rightarrow Ca(NO_3)_2(aq)+2H_2O(l)$

For (2):

A single displacement reaction is defined as the reaction in which a more reactive metal displaces a less reactive metal from its salt solution. The general chemical equation follows:

$A+BX\rightarrow AX+B$

where,

Metal A is more reactive than metal B

The reactivity of metals is judged by the reactivity series where a metal lying above in the series is more reactive than the metal lying below it.

From the reactivity series below,

Zinc lies above in the series than lead thus is more reactive and will easily replace lead from its aqueous solution.

While zinc lies below in the series than calcium thus is less reactive and will not easily replace calcium from its aqueous solution.

$Zn(s)+Pb(NO_3)_2(aq)\rightarrow Zn(NO_3)_2(aq)+Pb(s)$

$Zn(s)+CaCl_2(aq)\rightarrow \text{No reaction}$

5 0

3 years ago

How many atoms of hydrogen are in 0.56 mol of (NH4)2SO4

BabaBlast [244]

<h2>Answer: $2.7\times 10^{24}$ atoms</h2>

Explanation:

The given formula of the compound is $(NH_{4})_{2}SO{4}$

The formula says

Every mole of $(NH_{4})_{2}SO{4}$ contains $8$ moles of atoms of hydrogen.

Given that number of moles of compound is $0.56$

So,the number of moles of hydrogen atoms present is $0.56\times 8=4.48$

Since each mole has $6.022\times 10^{23}$ atoms,

$4.48$ moles has $4.48\times 6.022\times 10^{23}=2.7\times 10^{24}$ atoms.

7 0

3 years ago

Which of the following is an ionic compound? A. N2O B. CO C. HCL D. Na2O

zzz [600]

Answer:

D. Na2O

Because we already know that sodium oxide is a binary ionic compound because it contains one metal cation and one non-metal anion.

5 0

2 years ago

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