4. A serving of cereal contains about of protein 9 mg 9 g 90 g 9 kg

What happens when water is added to quicklime? Write two observations.

Neporo4naja [7]

Answer:

1.Most metal oxides are insoluble in water but some of these (e.g. Na2O.

Explanation:

2.: (i) A hissing sound is observed.

1.ii) The mixture starts boiling and lime water is obtained.

3 0

3 years ago

If 1.9 kJ of heat is transferred to 96 g aluminum at 113°C, what would the

erastova [34]

Answer:

T2 = 135.1°C

Explanation:

Given data:

Mass of water = 96 g

Initial temperature = 113°C

Final temperature = ?

Amount of energy transfer = 1.9 Kj (1.9×1000 = 1900 j)

Specific heat capacity of aluminium = 0.897 j/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = T2 - T1

Now we will put the values in formula.

Q = m.c. ΔT

1900 j = 96 g × 0.897 j/g.°C × T2 - 113°C

1900 j = 86.112 j/°C × T2 - 113°C

1900 j / 86.112 j/°C = T2 - 113°C

22.1°C + 113°C = T2

T2 = 135.1°C

4 0

3 years ago

What do cations and anions form?

melomori [17]

Answer: Cations (positively-charged ions) and anions (negatively-charged ions) are formed when a metal loses electrons, and a nonmetal gains those electrons. The electrostatic attraction between the positives and negatives brings the particles together and creates an ionic compound, such as sodium chloride.

7 0

3 years ago

Explain why ethanol will dissolve in water and carbon tetrachloride will not.

Rama09 [41]

This is because iodine is nonpolar. You also saw that the iodine was less soluble inethanol and acetone than it was in carbon tetrachloride. Ethanoland acetone are more polar thancarbon tetrachloride. Iodine was more soluble in them than it was in water because they are less polar than water.

4 0

3 years ago

Identify product A from the given 1H NMR data. Treatment of CH2═CHCOCH3 with one equivalent of HCl forms compound A. A exhibits

Blizzard [7]

Answer:Please refer the attachment for the structure. The name of the compound is 4-chloro butan-2-one

Explanation:

When we treat CH₂=CHCOCH₃ with one equivalent of HCl , the alkene reacts with HCl to undergo electrophilic addition to the C=C pi bond . The reaction is similar to Markowinkoffs addition reaction. The reaction leads to the formation of Cl-CH₂-CH₂-COCH₃ .

Kindly refer the attachment for mechanism of the reaction.

We can ascertain the structure of A from the NMR data available :

The NMR spectra has a absorption signal at 2.2 which can be ascertained to the CH₃(referred as 3 in structure protons) group attached next to the the carbonyl group as these protons generally appear at around 2.0-2.5ppm. These protons are slightly downfield as they are attached next to sp² hybridized carbonyl carbon. The spin multiplicity shown by these protons is singlet which also shows that no coupling occurs as there are no available protons at the neighboring carbonyl carbon.

The NMR spectra has a absorption signal at 3.05 and it can be ascertained to CH₂ group next to carbonyl group (referred as 2 in the structure). The protons appear slightly downfield due to carbonyl group and weak electron withdrawing inductive effect of chlorine atom. The spin multiplicity of these protons is triplet on account of coupling with the neighboring CH₂ protons next to Cl.

The NMR spectra has a absorption signal at 3.79 and it can be ascertained to CH₂ group next to chlorine group (referred as 1 in the structure). The protons appear slightly more downfield due to strong electron withdrawing inductive effect of Cl atom. The spin multiplicity of these protons is triplet on account of coupling with the neighboring CH₂ protons next to carbonyl group.

Kindly refer attachment for reaction mechanism and structure.

6 0

3 years ago