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katen-ka-za [31]
3 years ago
11

Which of these are elements? Choose the two correct answers.

Chemistry
2 answers:
Alekssandra [29.7K]3 years ago
8 0
Answer: Oxygen and carbon
sergeinik [125]3 years ago
7 0

Answer:

B & C

Explanation:

Carbon and Oxygen are both elements :)

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D. The kilogram is a unit of mass.
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The thioketal product of a certain reaction is given below. draw the structure of:
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8 0
3 years ago
400 mL of gas is contained at 300 mmHg and 0 °C. What will its volume be at 140 mmHg and 100 °C? 0°C 100°C
PIT_PIT [208]

Answer:

1171.12 mL

Explanation:

Using the combined gas law equation;

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (mmHg)

P2 = final pressure (mmHg)

V1 = initial volume (milliliters)

V2 = final volume (milliliters)

T1 = initial temperature (Kelvin)

T2 = final temperature (Kelvin)

According to the information provided in this question:

P1 = 300 mmHg

P2 = 140 mmHg

V1 = 400 mL

V2 = ?

T1 = 0°C = 273K

T2 = 100°C = 100 + 273 = 373K

Using P1V1/T1 = P2V2/T2

300 × 400/273 = 140 × V2/373

120000/273 = 140V2/373

120000 × 373 = 273 × 140V2

44760000 = 38220V2

V2 = 44760000 ÷ 38220

V2 = 1171.115

The new volume is 1171.12 mL

7 0
3 years ago
Which is an example of a solution? A. sand B. salad C. carbon D. seawater
Trava [24]
 Again, I believe the answer would be D. seawater.
7 0
4 years ago
Read 2 more answers
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