CHEMISTRY HIGH SCHOOL

Number of CO2 molecules in 0.0180 mol CO2

Answers

Answer 1
Answer:  1.8x10^-2 (6.023x10^23) = 10.84x10^21 = 1.08x10^22
Answer 2
Answer: 1.8x10^2(6.023x10^23)=10.84x10^21
Answer is
1.08x10^22

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Which compound has the strongest hydrogen bonding between its molecules? 1. HBr 2. HF 3. HCl 4. HI

Answers

You can compare the strength of the hydrogen bonding by comparing the electronegativities of the other elements. All the four elements, Br, F, Cl and I belong to the same group in the periodic table: group 17 named halogens. Then the kind of bonding they form is similar: polar covalent. You must know the trend of the electronegativities in the periodic table. Electronegativity decrease when you down across a group. Then the electronegativity of F is the higher of the group (indeed, it is the highest of all the 118 elements) . The higher the electronegativity the stronger the attraction that the halogen attracts the electrons and the stronger the hydorgen bonding. Then, the conclusion is that HF has the strongest hydrogen bonding.
The correct answer is HF

A mixture of oxygen, hydrogen, and nitrogen exerts a total pressure of 378 kPa. If the partial pressures of oxygen and hydrogen are 212 kPa and 101 kPa respectively, what is the partial pressure exerted by nitrogen?

Answers

What's the relationship between total and partial pressure? The total pressure is the sum of the parcial pressures!


So for us, it would be:

378= 212+101+x

where x is the parcial pressure of nitrogen.

Now we count:
378= 212+101+x
378=313+x
378-313=x
65=x

So the parcial pressure exerted by nitrogen is 65!

Semantics is the study of:

Answers

relationships between words and how we construct meaning.

During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is likely occurring?

Answers

The formation of a precipitate is always caused by a chemical reaction between a liquid solution and a precipitant. When solid particles suddenly appear in a sample of liquid under experimentation, that is an obvious sign that a reaction has occurred. Precipitates possess various qualities such as color and size. The only exception to this is when a precipitate forms when solubility of a solute is exceeded.

Answer:

A solid forms, and there is a change of color.

Explanation:

;)

Water is initially present in a state where its molecules are far apart. During a change of state, its molecules slow down. Which change of state has most likely taken place?

Answers

The correct option for above statement is

a.from a gas to a liquid


Explanation:

A liquid will be regenerate to a gas by heating. A gas will be regenerate into a liquid by increasing the pressure of a gas sample. A liquid will be regenerate to a gas by cooling. A gas will be regenerate into a liquid by cooling.

Explanation:

In vapor state of water, molecules are far apart from each other as they have high kinetic energy. Hence, they move rapidly from one place to another. Therefore, the molecules are far apart from each other.

Whereas when the speed of molecules slow down then gaseous (or vapor) state of water changes into liquid state. As decrease in kinetic energy of molecules will bring them closer to each other.

Hence, we can conclude that change of state that has most likely taken place is liquid state.

Olive oil has a density of 0.92 g/mL. How much would 1 liter of olive oil weigh in grams?

Answers

Dimension analysis is to be used to solve this problem. First convert 1L to milliliters. That is equivalent to 1000 ml. Then by dimension analysis, multiply the volume ( 1000ml) to the density of oil (0.92 g/ml) resulting to the answer: 920 grams. 
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