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katen-ka-za [31]
4 years ago
9

What element is added to toothpaste and City Water Systems to help tooth decay

Chemistry
1 answer:
Dovator [93]4 years ago
6 0
Flouride (F)

i think this is correct..
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What volume is occupied by a 0.118 mol of helium gas at a pressure of 0.97 atm and a temperature of 305 K ? Would the volume be
Naddika [18.5K]

Answer:

See below

Explanation:

PV = n RT        R = .082057  L - Atm / (K-Mole)

.97 V = .118 (.082057)(305)    

    V = 3.04 liters

Will not change for argon.....will be the same for all ideal gases

5 0
2 years ago
Salt dissolves easiest in
denis-greek [22]
I think it's just water right..?
8 0
3 years ago
Read 2 more answers
The addition of hydrochloric acid to a silver nitrate solution precipitates silver chloride according to the reaction:
Nimfa-mama [501]

Answer:

Enthalpy change for the reaction is -67716 J/mol.

Explanation:

Number of moles of AgNO_{3} in 50.0 mL of 0.100 M of AgNO_{3}

= Number of moles of HCl in 50.0 mL of 0.100 M of HCl

= \frac{0.100}{1000}\times 50.0 moles

= 0.00500 moles

According to balanced equation, 1 mol of AgNO_{3} reacts with 1 mol of HCl to form 1 mol of AgCl.

So, 0.00500 moles of AgNO_{3} react with 0.00500 moles of HCl to form 0.00500 moles of AgCl

Total volume of solution = (50.0+50.0) mL = 100.0 mL

So, mass of solution = (100.0\times 1.00) g = 100 g

Enthalpy change for the reaction = -(heat released during reaction)/(number of moles of AgCl formed)

= \frac{-m_{solution}\times C_{solution}\times \Delta T_{solution}}{0.00500mol}

= \frac{-100g\times 4.18\frac{J}{g.^{0}\textrm{C}}\times [24.21-23.40]^{0}\textrm{C}}{0.00500mol}

= -67716 J/mol

[m = mass, c = specific heat capacity, \Delta T = change in temperature and negative sign is included as it is an exothermic reaction]

4 0
3 years ago
Determine the number of atoms in 0.075 mol of Carbon (C)? please help
nignag [31]
It would be C, 6.2 x 10^23.

Avogadro's number, or, the mole, is 6.02 x 10^23. Although the grams and molar mass of an element may be different, every element must have the same amount of atoms to obey avogadro's number. 
5 0
3 years ago
In ______ observation, EVERY INDIVIDUAL in a population is counted. In _________ observation, SIGNS OF AN INDIVIDUAL, such as tr
larisa86 [58]

Answer:

In direct observation, EVERY INDIVIDUAL in a population is counted. In indirect observation, SIGNS OF AN INDIVIDUAL, such as tracks or nests, are counted.

Explanation:

Direct observation is to involve looking at the actual behavior or occurrence so for your question it would be every individual.

Indirect observation is a result of that occurrence, so for your question it would be the signs of an individual.

8 0
4 years ago
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