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2 years ago

Select the correct formula for the polyatomic ion.

Chemistry

2 answers:

Helga [31]2 years ago

7 0

The poly atomic ion formula for ammonium would be NH4+

nignag [31]2 years ago

4 0

Answer:

B (NH4+)

For the next one (nitrate ion) it's A (NO3-)

For the last (chromate ion...) it's C (CrO4^2-)

Explanation:

For edge:)

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A 5.00-g sample of copper metal at 25.0 °C is heated by the addition of 133 J of energy. The final temperature of the copper is

vekshin1

Answer: The final temperature of the copper is 95°C.

Explanation:

To calculate the final temperature for the given amount of heat absorbed, we use the equation:

$Q= m\times c\times \Delta T$

Q = heat absorbed = +133 J (heat is added to the system)

m = mass of copper = 5.00 g

c = specific heat capacity of copper = 0.38 J/g ° C

$\Delta T={\text{Change in temperature}}=T_2-T_1$

$T_1=25^oC$

Putting values in above equation, we get:

$+133J=5.00g\times 0.38J/g^oC\times (T_2-25)\\\\T_2=95^oC$

Hence, the final temperature of the copper is 95°C.

3 0

2 years ago

which caused a change in matter. Select each procedure that is likely a chemical change. Salt crystals were crushed into a fine

olga55 [171]

Procedures that are likely a chemical change are:

- Bubbles were produced when iron was placed in acid.

- Two liquids were combined, and a solid appeared

- A white substance turned blue when water was added.

5 0

2 years ago

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What is20 grams of HNO^3

morpeh [17]

63.01284*20=1260.568

7 0

2 years ago

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Use the problem below to answer the question:

Valentin [98]

Answer:

yes

Explanation:

yes

8 0

2 years ago

How many moles of methane (CH4) are in 7.31 x 10^25 molecules

Ivan

molar mass of methane CH4

= C + 4 H

= 12.0 + 4 x 1.008

= 12.0 + 4.032

= 16.042g/mol

7.31 x 10^25 molecules x 1 mole CH4 = 121.43 moles

6.02 x 10^23 CH4 molecules

121.43 moles CH4 are present.

6 0

2 years ago

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