All categories

3 years ago

What's a hypothesis for Which fruit contains the most vitamin c?

1 answer:

4 0

Find a fruit you think is the one that contains the most vitamin C.

For example: kiwi

Answer: I hypothesize that kiwi contains the most vitamin C

Then after that you test your hypothesis by comparing fruit that contains vitamin C in an experiment.

You might be interested in

Why does light from the infrared lamp<br> warm the mirror when light from the desk lamp does not?

Sunny_sXe [5.5K]

Answer:

Because the infrared lamp gives off a type of light that the desk lamp does not, and the mirror can only take in the energy from the infrared light.

Explanation:

7 0

3 years ago

The decomposition of hydrogen peroxide, H2O2, has been used to provide thrust in the control jets of various space vehicles. Usi

Genrish500 [490]

Answer:

The heat released is 56.7 kJ.

Explanation:

To solve this problem, first we need to find out the standard enthalpy of reaction, that is, the energy released at constant pressure in standard conditions (P=1bar, T=298.15K). We can find it using the expression:

ΔH°r = Σn(p).ΔH°f(p) - Σn(r).ΔH°f(r)

where,

n refers to the number of moles of reactants and products in the balanced equation

ΔH°f refers to standard enthalpies of formation (which can be found in tables).

Given the equation:

2 H₂O₂(l) → 2 H₂O(g) + O₂(g)

We can replace with the proper data in the equation:

ΔH°r = Σn(p).ΔH°f(p) - Σn(r).ΔH°f(r)

ΔH°r= [2 mol . ΔH°f H₂O(g) + 1 mol . ΔH°f O₂(g)] - [2 mol . ΔH°f H₂O₂(l)]

ΔH°r= [2 mol . (-241.8 kJ/mol) + 1 mol . 0 kJ/mol] - [2 mol . (-187.8 kJ/mol)]

ΔH°r = -108.0 kJ

Since enthalpy is an extensive property, it depends on the amount of reagents. In this case, 108.0 kJ of heat are released every 2 moles of H₂O₂(l) decomposed. Then, for 1.05 mol of H₂O₂(l):

$1.05 mol.\frac{-108.0kJ}{2mol} =-56.7kJ$

By convention, the negative sign means that heat is released.

5 0

3 years ago

Methanol (CH3OH) is the simplest of the alcohols. It is synthesized by the reaction of hydrogen and carbon monoxide

andrezito [222]

Answer:

By reacting carbon monoxide and hydrogen the formation of methanol takes place, the reaction is,

CO(g)+2H₂(g)⇔CH₃OH (g)

Based on the given reaction, one mole of methanol is obtained by reacting one mole of carbon monoxide (CO) with the two moles of hydrogen (H₂). It is mentioned in the question that for the reaction 500 mol of carbon monoxide and 750 moles of hydrogen are present.

Therefore for 500 moles of carbon monoxide, there is a requirement of 2 × 500 moles of hydrogen, which is equivalent to 1000 moles of hydrogen (H₂). However, only 750 moles of hydrogen is present. Therefore, the limiting reactant in the given case is H₂. The present moles of H₂ will react with 0.5 × 750 moles of CO = 375 mole of CO

The additional or excess concentration of CO, which is the excess reactant will be, 500-375 = 125 moles.

6 0

3 years ago

What kind of ion is contained in salts that produce an acidic solution? a positive ion that attracts a proton from water a negat

vekshin1

Answer: a negative ion that attracts a proton from water is the correct answer.

Explanation:

An acidic solution is defined as a solution that is formed when a strong acid combines with a weak base.

For example, $HCl + NH_{4}OH \rightarrow NH_{4}Cl + H_{2}O$

So, when $Cl^{-}$ from $NH_{4}Cl$ attract a proton from water then it will form HCl which is acidic in nature and being a strong acid will result in an acidic solution.

When a solution is formed from a strong bases and weak acid then it will result in a basic solution. When a weak acid will react with a weak base then it will result in a neutral solution.

Hence, we can conclude that a negative ion that attracts a proton from water is the kind of ion that is contained in salts that produce an acidic solution.

5 0

3 years ago

For a reaction with ΔH° = −9 kJ/mol, decide if the following statement is true. If it is false, choose the statement that makes

Arlecino [84]

Answer: c. The statement is true

Explanation:

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and for the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and for the reaction comes out to be negative.

As the given value of $\Delta H^0=-9kJ/mol$ , the heat is released and is exothermic.Thus the statement that the reaction is exothermic is true.

3 0

3 years ago