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Lostsunrise [7]
3 years ago
15

Can someone help me ????

Chemistry
2 answers:
agasfer [191]3 years ago
7 0

Answer:

\boxed {\boxed {\sf Cobalt, Iron, and \  Copper}}

Explanation:

The Stock System states that In a chemical formula or equation, some metals need a roman numeral after their symbol. If a metal has <u>multiple oxidation states</u>, it needs a roman numeral.

Use the Periodic Table to see the oxidation states for each metal.

  • Cobalt (Co): +3, +2
  • Lithium (Li): +1
  • Barium (Ba): +2
  • Iron (Fe): +3, +2
  • Copper (Cu): +2, +1
  • Potassium (K): +1

We can see that <u>cobalt, iron, and copper</u> have more than one oxidation state, so they would require a roman numeral.

Alexandra [31]3 years ago
4 0

Answer:

B) Lithium

C) Barium

F) Potassium

Explanation:

All of the above are Inorganic Compounds.

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A weather balloon at Earth’s surface has a
tigry1 [53]

The temperature : 263.016 K

<h3>Further explanation</h3>

Combined with Boyle's law and Gay Lussac's law  

\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}

P1 = initial gas pressure (N/m² or Pa)  

V1 = initial gas volume (m³)  

P2 = gas end pressure  

V2 = the final volume of gas  

T1 = initial gas temperature (K)  

T2 = gas end temperature  

P1=760 mmHg

V1= 4 L

T1 = 275 K

P2=704 mmHg

V1=4.13 L

\tt \dfrac{760\times 4}{275}=\dfrac{704\times 4.13}{T_2}\\\\T_2=263.016~K

6 0
3 years ago
Determine the length of the object shown <br>A. 97.8 mm<br>B. 97.80 mm<br>C. 97 mm<br>D. 98 mm​
jeka94

Answer:

A. 97.8 mm  

Explanation:

There are 10 divisions between 9 cm (90 mm) and the end of the ruler (10 cm or 100 mm).

Each division equals 1 mm.

Each 5 mm mark has a longer tick, and the dashed red line is between the 97 mm and 98 mm marks.

You would normally estimate to the nearest tenth of a division. An estimate of 0.8 mm is reasonable.

The length of the object is 97.0 mm + 0.8 mm = 97.8 mm.

B is wrong. You can't possibly estimate to the nearest hundredth of a division.  

C is wrong. The dashed red line slightly before the 98 mm mark.

D is wrong. If the dashed red line were exactly on the 98 mm mark, you would record the measurement as 98.0 mm. This indicates that you measured the object to zero tenths on either side of the mark.

 

6 0
2 years ago
What type of wave moves the audio and visual signals?
aev [14]

Answer:

your answer is B

Explanation:

7 0
3 years ago
The solid form of a substance is usually more dense than its liquid and gaseous forms. Similarly the liquid form is usually more
bonufazy [111]
A is the answer.

Ice is solid, however, water is liquid. Yet ice still floats which is less dense than water.

Hope this helps!
4 0
3 years ago
Based on the enthalpy changes given for the reactions, which reactions are endothermic?
slamgirl [31]

Explanation:

yan po sana makatulong

pa brainliest na din po thanks

4 0
2 years ago
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