3 years ago

All the radioactive elements are found in the last group of the Periodic Table.

Chemistry

2 answers:

Nana76 [90]3 years ago

6 0

Answer:

False

Explanation:

faust18 [17]3 years ago

4 0

I think the awser is false

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a gas has a volume of 2.00 at 323k and 3.00 ATM What would be the new volume if the temperature is changed to 273 K in the press

Ber [7]

Answer:

$V_2 = 5.07L$

Explanation:

$\frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2}\\V_2 = \frac{P_1 V_1 T_2}{T_1 P_2} = \frac{3.00atm \cdot 2.00L \cdot 273K}{323K \cdot 1.00atm} = 5.07L$

6 0

2 years ago

The following reaction was carried out in a 3.00 L reaction vessel at 1100 K:

Nady [450]

Answer:

$Q=0.840$

Explanation:

Hello,

In this case, since the given undergoing chemical reaction is correctly balanced, the reaction quotient is computed as well as the equilibrium constant but in terms of the given concentrations that are:

$C_{C}=\frac{5.25mol}{3.00L} =1.75M\\C_{H_2O}=\frac{12.2mol}{3.00L} =4.07M\\C_{CO}=\frac{3.90mol}{3.00L}=1.30M\\C_{H_2}=\frac{7.90mol}{3.00L} =2.63M$

In such a way, the reaction quotient turns out:

$Q=\frac{C_{CO}C_{H_2}}{C_{H_2O}}=\frac{1.30M*2.63M}{4.07M}\\ Q=0.840$

Taking into account that carbon is not included since it is solid.

Best regards.

7 0

3 years ago

A pan containing 20 grams of water was allowed to cool from temperature of 95 degrees C. If the amount of heat released is 1200

mina [271]

Answer:

81 °C

Explanation:

I don’t know, I just know :)

8 0

3 years ago

The correct answer for the addition of 5.8 g + 2.26g + 1.311g + 2 g is?

jeka94

Answer:

= 11.371g

Explanation:

Hope This Helps! :]

4 0

3 years ago

Write the symbols for the following isotopes: Its atoms contain 50 electrons and 70 neutrons

Veronika [31]

Since this element has 50 electrons you know that it has 50 protons. The number of proton= the atomic number. Atomic number 50 is tin. The atomic symbol for tin is Sn and the weight is 120. So this is the tin 120 isotope

6 0

3 years ago