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Bumek [7]
3 years ago
9

How many lone pairs are on the central atom of a molecule of RnCl4?

Chemistry
1 answer:
Eva8 [605]3 years ago
3 0
My teacher said it is c
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7. A gas ______.
enot [183]

Answer:

C

Explanation:

A gas is a state of matter that has no fixed shape and no fixed volume gases have lower density than other states of matter such as solids and liquids.

7 0
3 years ago
Write the electron configuration for the element titanium, Ti.
SOVA2 [1]

Answer:

[Ar] 3d^{2} 4s^{2}

Explanation:

You can look at the periodic table and figure out the electron config.

8 0
3 years ago
A Rolaids tablet contains calcium for neutralizing stomach acid. if a Rolaids tablet neutralizes 24.65ml of 0.547m hydrochloric
Lelu [443]

There are 674 mg of calcium carbonate in a Rolaids tablet

<h3>Further explanation</h3>

Reaction

CaCO₃ + 2HCl ⇒ CaCl₂ + CO₂ +H₂O

V HCl = 24.65 ml

M HCl = 0.547

mol HCl :

\tt 24.65\times 0.547=13.48~mlmol

ratio mol CaCO₃ : HCl = 1 : 2, so mol CaCO₃ :

\tt \dfrac{1}{2}\times 13.48=6.74~mlmol=6.74\times 10^{-3}~mol

mass of CaCO₃ (MW=100~g/mol) :

\tt 6.74\times 10^{-3}\times 100=0.674~g=674~mg

4 0
3 years ago
How does the calorie compare to the metric unit the joule? How do you calculate a calorie? Is it the same for all types of food?
wlad13 [49]

Calorie (cal) or small calorie, is the amount of energy needed to heat one gram of water by one degree Celsius.

One small calorie is approximately 4.2 joules.

A calorie is a unit of energy.

For example:

Q = 150000 J; released energy.

Convert Jules in calories:

Q = 150000 J ÷ 4.186 J/calorie.

Q = 35833.73 calorie.

The large calorie or nutritional calorie (symbols: Cal, kcal) is the heat energy needed to raise the temperature of one kilogramof water by one degree Celsius.  

A nutritional calorie, or kilocalorie, is equal to 1000 calories.

One large calorie is 4.184 kilojoules: 1 Cal = 4.184 kJ.

For example:

E = 2500 Cal; energy burnt.

E = 2500 Cal · 4.184 kJ/Cal.

E = 10460 kJ.

5 0
3 years ago
How many nadh molecules are produced on each turn of the citric acid cycle?
Kaylis [27]

Answer:

three NADH molecules

The eight steps of the citric acid cycle are a series of redox, dehydration, hydration, and decarboxylation reactions. Each turn of the cycle forms one GTP or ATP as well as three NADH molecules and one FADH2 molecule, which will be used in further steps of cellular respiration to produce ATP for the cell.

Explanation:

5 0
3 years ago
Read 2 more answers
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