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3 years ago

The isotope sulfur is represented as sulfur-35 or S-35, what does the number 35 signify?

1 answer:

3 0

It would be S - 35 because people made the short form of each element to make it easier to understand and it is also used all around the world and 35 is the atomic number. Hope this helps ;)

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A 0.5 kg ball rolls down a frictionless inclined plane. The height of the inclined plane is 0.5m. What is the kinetic energy of

joja [24]

Answer:

2.45Joules

Explanation:

since kinetic energy is K.E.=1/2m $v^{2}$

lost in potential energy is gain of kinetic energy

mgh=1/2mv^2

9.8*2*0.5=v^2

$v^{2}$ =9.8

v= $\sqrt{9.8}$ =3.13m/s

now k.e. = 0.5*m* $v^{2}$ =0.5*0.5*9.8 =2.45J

8 0

3 years ago

Elements symbol

Marat540 [252]

1) H
2) He
3) Li
4) Be
5) B
6) C
7) N
8) O
9) F
10) Ne
11) Na
12) Mg
13) Al
14) Si
15) P
16) S
17) Cl
18) Ar
19) K

8 0

2 years ago

which of the following statements correctly describes the relative masses of the particles in atoms

zysi [14]

Answer:

protons and neutrons

Explanation:

protons and neutrons is equal to mass number

6 0

3 years ago

A solution has a pH of 12. This solution is:

kolezko [41]

Answer:

basic

Explanation:

pH 7: neutral

12>7

so it is basic

(if <7 than acidic)

3 0

3 years ago

Carbon dioxide and water react to form methanol and oxygen, like this:

fredd [130]

Answer:

24x10³

Explanation:

2CO₂(g) + 4H₂O(g) → 2CH₃OH(l) + 3O₂ (g)

The equilibrium constant for this reaction is:

Kc = $\frac{[O_2]^3}{[CO_2]^2[H_2O]^4}$

The expression of [CH₃OH] is left out as it is a pure liquid.

Now we convert the given masses of the relevant species into moles, using their respective molar masses:

CO₂ ⇒ 3.28 g ÷ 44 g/mol = 0.0745 mol CO₂

H₂O ⇒ 3.86 g ÷ 18 g/mol = 0.214 mol H₂O

O₂ ⇒ 2.80 g ÷ 32 g/mol = 0.0875 mol O₂

Then we calculate the concentrations:

[CO₂] = 0.0745 mol / 7.5 L = 0.0099 M

[H₂O] = 0.214 mol / 7.5 L = 0.0285 M

[O₂] = 0.0875 mol / 7.5 L = 0.0117 M

Finally we calculate Kc:

Kc = $\frac{0.0117^3}{0.0099^2*0.0285^4}$ = 24x10³

3 0

3 years ago