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dalvyx [7]
2 years ago
10

Which statements accurately describe elements? Check all that apply.

Chemistry
2 answers:
svet-max [94.6K]2 years ago
7 0

Answer:

  • Elements are made up of only one type of atom.
  • Each element has a unique chemical symbol.
  • Elements can be identified by their atomic number.

Explanation:

alex41 [277]2 years ago
4 0

Answer:

2,3,4

Explanation:

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Carbon dioxide enters the atmosphere by natural processes and from human activity. Why is the latter a cause of concern?
Angelina_Jolie [31]

By removing long-buried fossil fuels and burning them to produce electricity, human activities have drastically disrupted the natural carbon cycle and released CO2 into the atmosphere. The burning of fossil fuels like coal, natural gas, and oil, including gasoline, is responsible for 85% of all human-produced carbon dioxide emissions.

reductions in atmospheric oxygen concentration and the proportion of other carbon isotopes (14C and 13C) have been observed. Because the natural mechanisms that may restore the balance are too slow relative to the rates at which human activities are adding CO2 to the atmosphere, the extra CO2 from burning fossil fuels and deforestation has upset the equilibrium of the carbon cycle. As a result, a sizeable portion of the CO2 produced by human activity builds up in the atmosphere, where part of it will stay for thousands of years rather than just a few decades or centuries.

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6 0
2 years ago
What should be the mole fraction of sucrose (C12H22O11) in an aqueous solution at 20°C so that the vapor pressure of water above
zloy xaker [14]

Answer:

The mol fraction of sucrose in an aqueous solution at 20°C  is 0.114

Explanation:

Step 1: Data given

The vapor pressure of water above the solution is 2.0 mmHg

The vapor pressure of pure water at 20 °C is 17.5 mmHg

Step 2: Calculate the mol fraction of sucrose

Psolution = (χsolvent) (P°solvent)

⇒with Psolution = the vapor pressure of the solution is 2.0 mmHg

⇒with χsolvent = the mol fraction of sucrose = TO BE DETERMINED

⇒with P°solvent = the vapor pressure of pure water at 20 °C =17.5 mmHg

2.0 mmHg = X * 17.5 mmHg

X = 2.0 mmHg / 17.5 mmHg

X = 0.114

The mol fraction of sucrose in an aqueous solution at 20°C  is 0.114

7 0
3 years ago
7. A student has a 25 g sample of gas in a container at STP and adds another 7
BigorU [14]

Answer:

New temperature t2 = [1.28T− 273.15]° C

Explanation:

Given:

Volume v1 = 25 gram

New volume v2 = 25 + 7 = 32 gram

Constant pressure = p

Temperature t1 = T

Find:

New temperature t2

Computation:

Pv1/t1 = Pv2/t2

25 / T = 32 / t2

t2 = 1.28T

New temperature t2 = [1.28T− 273.15]° C

4 0
3 years ago
How many grams of water will form when 10.54g of h2o react with 95.10g of O2
Alex_Xolod [135]
You have to divide them by each other


8 0
3 years ago
Crude oil may contain hundreds of different types of hydrocarbons. Some examples include: Butane(C4H10) Dodecane (C12H26) Octane
Nesterboy [21]

Answer:

Butane and benzene are both compounds. They contain multiple elements bonded together in a specific ratio. Kerosene and gasoline are mixtures because they are combinations of several compounds. Oxygen is an element because it is made up of only one type of atom.

Explanation:

7 0
3 years ago
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