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balu736 [363]
3 years ago
7

The number of protons + number of neutrons is equal to the

Chemistry
1 answer:
max2010maxim [7]3 years ago
5 0

Answer: mass

Explanation: the protons and neutrons make up the nucleus and nearly the entire mass of the atom

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Galvanized nails are iron nails that have been plated with zinc to prevent rusting. The relevant reaction is Zn2+(aq)+2e−→Zn(s)
Ymorist [56]

Answer:

52.0 moles

Explanation:

no. of moles of Zn =\frac{mass}{molar mass}=\frac{3400g}{65.38g/mol}=52.0mol

The important part in this question is changing the kilograms to grams so that the units of the mass(grams) are divisible by the units of the molar mass (grams/molar mass)

6 0
3 years ago
1) Os-182 has a half-life of 21.5 hours. How many grams of a 10 g sample would have decayed after
Monica [59]

Answer:

1.25 g

Explanation:

.5^3 = 0.125

0.125*10 = 1.25 g

8 0
3 years ago
F O R 50 P O I N T S !!!
nika2105 [10]

Answer:

You would put the 4 quantum numbers corresponding to the electrons being described above

Explanation:

Quantum numbers refer to electrons, so I'll assume you mean the electron number that would correspond with the atomic number of the element. Quantum numbers are basically like an address for electrons, giving us information about the location of an electron from most general to most specific.

8 0
3 years ago
Identify ways to reduce the risk of liquid bumping while heating.
postnew [5]

The most common way of preventing bumping is by adding one or two boiling chips to the reaction vessel. However, these alone may not prevent bumping and for this reason it is advisable to boil liquids in a boiling tube, a boiling flask, or an Erlenmeyer flask.

7 0
3 years ago
What is the molarity of 40ml of NaOH if it takes 25ml of 0.5 molar HCl to neutralize it?
Oksanka [162]

Answer:

Molarity of 40 ml of NaoH is 0.3125 mL

Explanation:

As we know  

Molarity of acid *  volume of acid = molarity of base * volume of base

Substituting the given values, we get  

0.5 * 25 = X* 40 \\X = \frac{0.5*25}{40} \\X = 0.3125

Molarity of 40 ml of NaoH is 0.3125 mL

6 0
3 years ago
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