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kupik [55]
3 years ago
6

Which of the following statements is true?

Chemistry
2 answers:
aliina [53]3 years ago
8 0
D! The chemical reacts to the number of atoms!
Liula [17]3 years ago
4 0
D) during chemical reactions the number and types of atoms
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The list shows five processes that occur during digestion.
Kobotan [32]
I think the answer is B.
8 0
3 years ago
What is the mass of naoh that would have to be added to 500 ml of a solution of 0.20 m acetic acid in order to achieve a ph of 5
il63 [147K]

The correct answer is 2.5 g.

Let x be the mass of NaOH in grams

The molar mass of NaOH = 40.0 gms/mol

Moles of NaOH = mass / molecular mass of NaOH

= x grams / 40.0 gms /mol = 0.025 x mol

Initial moles of CH₃COOH = volume × concentration of CH₃COOH

= 500 / 1000 × 0.20 = 0.1 mol

CH₃COOH + NaOH ⇒ CH₃COONa + H2O

Moles of CH₃COOH left = initial moles of CH₃COOH - moles of NaOH = 0.1 - 0.025x mol

Moles of CH₃COONa formed = moles of NaOH = 0.025x mol

Henderson-Hasselbalch equation:

pH = pKa + log ([CH₃COONa] / [CH₃COOH])

= pKa + log (moles of CH₃COONa /moles of CH₃COOH)

5.0 = 4.76 + log [0.025a / (0.1 - 0.025a)]

log [0.025a / (0.1 - 0.025a)] = 0.24

0.025a / (0.1 - 0.025a) = 10^0.24 = 1.738

0.068445a = 0.17378

a = 0.17378 / 0.068445

= 2.54 g

Mass of NaOH = a = 2.54 g or 2.5 g

4 0
3 years ago
Balance equation C5H10+O2=CO2+H2O
Crazy boy [7]

Answer:

2 C5H10 + 15 O2 => 10 CO2 + 10 H2O

Explanation: Each individual atom both in the reactant and product side have equal number of atoms.

Reactant Product

Carbon 10 10

Hydrogen 20 20

Oxygen 30 30

7 0
3 years ago
Read 2 more answers
The c—c—c bond angle in propane, c3h8, is closest to
Archy [21]
Propane has a molecular formula C3H8.

It is of the form CnH2n+2.
where n = number of C atoms. In present case n = 3.

Each carbon atom in propane is sp3 hydribized. Thus, there are 4 hydrid orbital associated with each carbon atom

The central C atom is sigma bonded to two other carbon atoms and two hydrogen atoms.

Such, sp3 hydridized orbitals are spacial orientated at an  angle of 109^{0}28^{'}, in order to minimize repulsion between the electrons.

Hence, the c—c—c bond angle in propane, c3h8, is closest to 109^{0}28^{'}
3 0
4 years ago
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The diagram above shows the results of Rutherford’s experiment in which he used a radioactive source to “shoot” alpha particles
satela [25.4K]

D is the answer its Atoms are mostly empty space with small, dense, positively charged centers.

3 0
3 years ago
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