All categories

3 years ago

Who said atoms are neither created nor destroyed in chemical reactions?

Chemistry

1 answer:

san4es73 [151]3 years ago

8 0

John Dalton from 1803

You might be interested in

Please help fast, I will give brainliest.

Serga [27]

Answer:

Explanation:

7 0

2 years ago

Read 2 more answers

What mass of H₂ is needed to react with 8.75 g of O₂ according to the following equation: O2(g) + H2(g) → H₂O(g)?

FromTheMoon [43]

Explanation:

For reacting with 8.75 grams of oxygen, 1.08 grams of hydrogen is required.

The given balanced equation has been:

\rm O_2\;+\;2\;H_2\;\rightarrow\;H_2OO2+2H2→H2O

From the equation, 1 mole of oxygen reacts with 2 mole of hydrogen to give 1 mole of water.

The mass of oxygen has been: 8.75 g,

Moles = \rm \dfrac{weight}{molecular\;weight}molecularweightweight

Moles of oxygen = \rm \dfrac{8.75}{32}328.75

Moles of oxygen = 0.27 mol

Since,

1 mole Oxygen = 2 mole hydrogen

0.21 mol oxygen = 0.54 mol hydrogen

Mass of hydrogen = moles \times× molecular weight

Mass of hydrogen = 0.54 \times× 2

Mass of hydrogen = 1.08 grams.

Thus, for reacting with 8.75 grams of oxygen, 1.08 grams of hydrogen is required.

6 0

1 year ago

25 Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!

KIM [24]

Answer:

Answers in explanation.

Explanation:

30. A (A chemical changes changes the chemical properties)

31. C (rusting is an example of a chemical change

32. B (A reaction requires energy, so some energy will be expelled)

33. B (Color change is an example of a chemical change)

34. A (The law of the conservation of mass: Mass and Energy cannot be created nor destroyed)

8 0

3 years ago

Which statement about a novel's setting iscorrect?

den301095 [7]

A. It can be as important to a story as a character

4 0

3 years ago

What is the approximate energy of a photon having a frequency of 4 x 10^7 Hz? (h = 6.6 x 10^-34 J . s)

BigorU [14]

Answer:

2.64 × $10^{-26}$ J

Explanation:

I think you should mark it a physics question instead but anyway.

---------------------------------------------------------------------------

The Planck equation should be applied:

E = hv , while E is energy of proton; h is Planck constant; and v is frequency.

E = 6.6 × $10^{-34}$ × 4 × $10^{7}$

= 6.6 × 4 × $10^{-27}$

= 2.64 × $10^{-26}$ J

3 0

3 years ago