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3 years ago

What are atoms made of?

Chemistry

1 answer:

mr Goodwill [35]3 years ago

7 0

Answer:

Explanation:

Atoms are made of 3 parts.

Protons
Electrons
Neutrons

- The protons and Neutrons form together creating a sun, or nucleus at the center

- The electrons orbit this sun like planets.

The element with Th is Thorium. It is a metallic chemical element that when exposed to air, hardens.

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A 14.4-gg sample of granite initially at 86.0 ∘C∘C is immersed into 24.0 gg of water initially at 25.0 ∘C∘C. What is the final t

kari74 [83]

Answer:

The final temperature of both substances when they reach thermal equilibrium is 31.2 °C

Explanation:

Step 1: Data given

Mass of sample granite = 14.4 grams

Initial temperature = 86.0 °C

Mass of water = 24.0 grams

The initial temperature of water = 25.0 °C

The specific heat of water = 4.18 J/g°C

The specific heat of granite = 0.790 J/g°C

Step 2: Calculate the final temperature

Heat lost = heat gained

Qgranite = - Qwater

Q = m*c*ΔT

m(granite)*c(granite)*ΔT(granite) = -m(water)*c(water)*ΔT(water)

⇒with m(granite) = the mass of granite = 14.4 grams

⇒with c(granite) = The specific heat of granite = 0.790 J/g°C

⇒with ΔT⇒(granite) = the change of temperature of granite = T2 - T1 = T2 - 86.0 °C

⇒with m(water) = the mass of water = 24.0 grams

⇒with c(water) = The specific heat of water = 4.18 J/g°C

⇒with ΔT(water) = the change of temperature of granite = T2 - T1 = T2 -25.0°C

14.4 grams * 0.790 * (T2 - 86.0°C) = -24.0 *4.18 * (T2 - 25.0°C)

11.376T2 - 978.336 = -100.32T2 + 2508

111.696 T2 = 3486.336

T2 = 31.2 °C

The final temperature of both substances when they reach thermal equilibrium is 31.2 °C

4 0

3 years ago

I point

Mrrafil [7]

The ionization constant equation is:

$K_{w}$ =1.0 × $10^{-14}$ at 25°C

the option is 1.

Explanation:

Sometimes in pure water one proton of the water molecule(hydrogen ion) will get attracted to the lone pairs present in another water molecule.This causes the hydrogen ion to leave the present water(leaving the $OH^{-}$ behind) molecule ad gets attached to another water molecule leading to the formation of the hydronium ion( $H^{3} O{+}$ ,hydronium ion).

This process is called auto-ionization of water because the water molecule ionizes into $H^{+}$ and $OH^{-}$ ions.

As such the equilibrium constant,which is measure of concentration of products to concentration of reactants,will be very slow.

∴the ionization constant of water at 25°C is 1.0 × $10^{-14}$ .

(i.e.)option<u> c</u> is correct answer [ $H^{+}$ ]=[ $OH^{-}$ ]

4 0

4 years ago

Gọi tên chất CH3-CH(CH3)-CH2-NH2

otez555 [7]

Answer:

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3 0

3 years ago

What is the ph of a 7.5*10^-3 m H+ solution

natulia [17]

The pH+ of solution is 3

6 0

3 years ago

Read 2 more answers

What mass of hydrochloric acid that reacted with zinc will produced 0.15dm3 of hydrogen at st.p? Equation for this reaction:

MrMuchimi

Answer:

${ \tt{22.4 \: dm {}^{3} \: contains \: 1 \: mole \: of \: hydrogen }} \\ { \tt{0.15 \: {dm}^{3} \: will \: contain \: ( \frac{0.15}{22.4} \times 1) \: moles }} \\ = 0.0067 \: moles \\ { \bf{mole \: ratio = 1 :1 }} \\ { \tt{1 \: mole \: weighs \: 65.38 \: g}} \\ { \tt{0.0067 \: moles \: weighs \: (0.0067 \times 65.38) \: g}} \\ = 0.44 \: g$

4 0

3 years ago