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3 years ago

Which is an element hydrogen , air , carbon dioxide , water

Chemistry

2 answers:

Basile [38]3 years ago

8 0

Answer:

Hydrogen is an element

Explanation:

Hydrogen is an element with only hydrogen atoms, whereas air, carbon dioxide, and water are all made up of multiple elements with different types of atoms.

suter [353]3 years ago

3 0

Answer: hydrogen

Explanation:

An element is a substance whose atoms have the same number of protons it’s not air because it is a mixture it is not water because it is a compound and carbon dioxide is a compound...

Hope this helped!!!!!!!

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Predict the boiling point of water at a pressure of 1.5 atm.

Lina20 [59]

Answer:

100.8 °C

Explanation:

The Clausius-clapeyron equation is:

$ln\frac{P_{1} }{P_{2}} =$ -Δ $\frac{H_{vap}}{r} (\frac{1}{T_{2}}-\frac{1}{T_{1}} )$

Where 'ΔHvap' is the enthalpy of vaporization; 'R' is the molar gas constant (8.314 j/mol); 'T1' is the temperature at the pressure 'P1' and 'T2' is the temperature at the pressure 'P2'

Isolating for T2 gives:

$T_{2}=(\frac{1}{T_{1}} -\frac{Rln\frac{P_{2}}{P_{1}} }{Delta H_{vap}}$

(sorry for 'deltaHvap' I can not input symbols into equations)

thus T2=100.8 °C

7 0

2 years ago

All of the following can be used to define an acid except

Norma-Jean [14]

Answer: a substance that increases the hydroxide ion concentration of a solution

Explanation: According to Arrhenius concept, an acid is a substance which donates hydronium ions $[H^+]$ ions when dissolved in water and base is a substance which donates hydroxide ions $[OH^-]$ ions in water.

According to the Bronsted Lowry conjugate acid-base pair, an acid is a substance that donates protons and a base is a substance that accepts protons.

According to Lewis concept, an acid is the substance which accepts electron pairs and abase is a substance which donates electron pairs.

Thus a substance that increases the hydroxide ion concentration of a solution is an Arrhenius base.

8 0

2 years ago

Forms of a given element that have a different number of neutrons are called cosmic rays. True False

Semenov [28]

Answer:

False

Explanation:

Forms of a given element that have a different number of neutrons are called isotopes.

5 0

1 year ago

Josh decided to mix some vinegar with baking soda. He knew that a reaction occurred because he made careful observations. He not

velikii [3]

Josh was sure that the reaction occurred because of the formation of carbon dioxide (CO₂) which is a gas.

Explanation:

Vinegar contains acetic acid (CH₃-COOH) and baking soda is sodium hydrogen carbonate (NaHCO₃). The reaction between these two compounds will produce sodium acetate (CH₃-COONa), carbon dioxide (CO₂) and water (H₂O).

CH₃-COOH + NaHCO₃ → CH₃-COONa + CO₂ + H₂O

Josh was sure that the reaction occurred because of the formation of carbon dioxide (CO₂) which is a gas.

Learn more about:

carbon dioxide

brainly.com/question/2840704

#learnwithBrainly

6 0

2 years ago

PLEASE HURRY!!!! The diagram shows 2 identical charged particle. How does the potential energy and the force of repulsion change

pogonyaev

Answer:

Please did you ever get an answer??

Explanation:

Im doing usa test prep too and its really late

5 0

2 years ago

Which is an element hydrogen , air , carbon dioxide , water​

Which is an element hydrogen , air , carbon dioxide , water