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Rudik [331]
4 years ago
13

Atoms are made of subatomic particles called protons, electrons and neutrons. What is true about the number of protons and elect

rons in a
stable atom?


A. the number of protons and electrons are equal

B. there are less protons than electrons

C. there are more protons than electrons
Chemistry
1 answer:
netineya [11]4 years ago
4 0
A. The number of protons are always the same as electrons.
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4.) The temperature of solid silver increases from 30C to 40C by the addition of 117.5
Artyom0805 [142]

Answer:

The mass of silver is 49 g (0.049 kg).

Explanation:

Initial temperature = 30^{o}C

Final temperature = 40^{o}C

Quantity of heat required = 117.5 J

Specific heat capacity of silver = 0.240 J/g^{o} C

mass of the silver can be determined by;

Q = mcΔθ

Where: Q is the quantity of heat required, m is the mass of substance, c is the specific heat capacity of the substance and Δθ is the change in temperature.

So that,

117.5 = m x 0.240 x (40 - 30)

117.5  = m x 0.24 x 10

        = 2.4m

m = \frac{117.5}{2.4}

   = 48.9583

m ≅

m = 49 g

The mass of silver is 49 g (0.049 kg).

4 0
3 years ago
1b<br>Describe the terms below:<br>2. adiabatic process​
Ugo [173]

Answer:

defined as a process in which mo heat transfer take place

Explanation:

is a process which occurs without transferring heat /mass between the system and it's surrounding.

8 0
3 years ago
Decide whether a chemical reaction happens in either of the following situations. If a reaction does happen, write the chemical
romanna [79]

Answer: 3Mg(s)+2SnCl_3(aq)\rightarrow 3MgCl_2(aq)+2Sn(s)

Explanation:

Single replacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.

A more reactive element is one which can easily lose or gain electrons as compared to the other element.

As Magnesium is more reactive than tin, it can easily displace tin from its salt solution (SnCl_3) and form magnesium chloride and tin in elemental form.

The balanced chemical equation is:

3Mg(s)+2SnCl_3(aq)\rightarrow 3MgCl_2(aq)+2Sn(s)

6 0
3 years ago
Why does a short circuit occur?
Margarita [4]

Answer:

Current randomly flows around the circuitt

8 0
3 years ago
Read 2 more answers
Which of these is a pure substance and why? A Milk, because every portion of the matter is the same, and its components can only
Maslowich

Answer:

d carbon dioxide

Explanation:

Carbon dioxide is a pure substance that is a compound (two or more elements bonded together).

7 0
3 years ago
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