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3 years ago

Why does heating an object increases its thermal energy?

2 answers:

7 0

All objects contain internal energy. Some of this is due to the movement of the particles in the object. When an object is heated, its particles move more vigorously and its internal energy increases.

Phoenix [80]3 years ago

6 0

Answer:

the average kinetic energy of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object increases as its temperature increases.

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The half life of an isotope X is 3 days how long will it take for 1/2 of a 10 G sample to decay

lorasvet [3.4K]

Answer: It will take 3 days for half of a 10 g sample to decay.

Explanation:

Half-life of sample of an isotope X = 3 days

$\lambda=\frac{0.693}{t_{\frac{1}{2}}}=\frac{0.693}{3 days}=0.231 day^{-1}$

$N=N_o\times e^{-\lambda t}$

$\lnN=-\lambda t\lnN_o$

Sample decayed = $\frac{N_o}{2}=\frac{10 g}{2 g}=5 g$

N= $N^o-\text{sample decayed}=10 g-5 g=5 g$ , time = t

$\ln[5 g]=-0.231 day^{-1}\times t\ln[10]$

$\ln[\frac{5}{10}]=-0.231\times t$

$\ln\frac{1}{2}=-0.693=-0.231\times t$

t = 3 days

It will take 3 days for half of a 10 g sample to decay.

3 0

3 years ago

How long does it take for a purple stem plant to grow

Gala2k [10]

I couldn't really find anything about the growth time but it does say that it could remain viable in soil for up to 40 years

4 0

4 years ago

Question 3 of 10

KATRIN_1 [288]

Answer:A

Explanation:

5 0

3 years ago

Choose the aqueous solution that has the highest boiling point. These are all solutions of nonvolatile solutes and you should as

UNO [17]

Answer: 0.100 m $K_2SO_4$

Explanation:

Elevation in boiling point is given by:

$\Delta T_b=i\times K_b\times m$

$\Delta T_b=T_b-T_b^0$ = Elevation in boiling point

i= vant hoff factor

$K_b$ = boiling point constant

m= molality

1. For 0.100 m $K_2SO_{4}$

$K_2SO_4\rightarrow 2K^{+}+SO_4^{2-}$

, i= 3 as it is a electrolyte and dissociate to give 3 ions. and concentration of ions will be $3\times 0.100=0.300$

2. For 0.100 m $LiNO_3$

$LiNO_3\rightarrow Li^{+}+NO_3^{-}$

, i= 2 as it is a electrolyte and dissociate to give 2 ions, concentration of ions will be $2\times 0.100=0.200$

3. For 0.200 m $C_2H_8O_3$

, i= 1 as it is a non electrolyte and does not dissociate, concentration of ions will be $1\times 0.200=0.200$

4. For 0.060 m $Na_3PO_4$

$Na_3PO_4\rightarrow 3Na^{+}+PO_4^{3-}$

, i= 4 as it is a electrolyte and dissociate to give 4 ions. and concentration of ions will be $4\times 0.060=0.24m$

Thus as concentration of solute is highest for $K_2SO_4$ , the elevation in boiling point is highest and thus has the highest boiling point.

3 0

3 years ago

Organizing a birthday party essay(around 150 words)

Ludmilka [50]

Answer:

Organizing a Birthday Party

On 20 June I was born and every year me and my parents celebrate my birthday in our house. But, This time I had an idea to organize my birthday party in a Big Hall where all my classmates and society friends will join me and we'll play lots of games and Have an amazing party.

So, I discussed my this idea with my father and he said "Okay, we'll celebrate your birthday this time as you wish". Then I took help from my GrandPa to send out invitation cards to my friend's and my father was going to book a Big Party Hall in 'The Calves Restaurant' where we will celebrate my birthday and my mother helped me in getting game ideas which we will play on the birthday.

On Birthday (20th June), when everybody arrived one of my friend sang a beautiful Birthday song from me. Then I blew out the candles off the cake. We also had games like Ludo, carrom, passing pillow, musical chair, and etc. At the end we had DJ where all my friends and my family members enjoyed. This was an amazing party to everyone.

Explanation:

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Thank-you,

8 0

3 years ago