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1 year ago

Unlike plants, humans cannot make their own food. Where do most humans get energy to live, breathe, and grow? (2 points)

Chemistry

1 answer:

Marat540 [252]1 year ago

3 0

Answer:

humans are omnivores they eat plants and animals exept for that vegan teacher

Explanation:

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The enthalpy of vaporization of liquid water at 100°C is 2257 kJ/kg. Determine the enthalpy for apordato of iuod eeat capacity o

igomit [66]

Explanation:

The given data is as follows.

$T_{1} = 100^{o}C$ , $T_{2} = 10^{o}C$

$\Delta H_{vap1}$ = 2257 kJ/kg, $\Delta H_{vap2}$ = ?

For water, $C_{p}$ = 4.184 $kJ/kg ^{o}C$

Formula to calculate heat of vaporization is as follows.

$\Delta H_{vap1} - \Delta H_{vap2}$ = $C_{p}(T_{1} - T_{2})$

Hence, putting the values into the above formula as follows.

$\Delta H_{vap1} - \Delta H_{vap2}$ = $C_{p}(T_{1} - T_{2})$

$2257 kJ/kg - \Delta H_{vap2}$ = $4.184 kJ/kg ^{o}C (100 - 10)^{o}C$

$\Delta H_{vap2}$ = 2257 kJ/kg - 376.56 kJ/kg

= 1880.44 kJ/kg

Thus, we can conclude that enthalpy of liquid water at $10^{o}C$ is 1880.44 kJ/kg.

3 0

2 years ago

If 0.0203 g of a gas dissolves in

ololo11 [35]

Answer:

P2 = P1*n2 / n1

=1.02 atm *0.008 moles / 0.00113 moles

= 7.22 atm

∴the new pressure will be 7.22 atm

Explanation:

7 0

2 years ago

The molar mass of oxygen gas (O2) is 32.00 g/mol. The molar mass of C3H8 is 44.1 g/mol. What mass of O2, in grams, is required t

Ira Lisetskai [31]

The reaction formula of this is C3H8 + 5O2 --> 3CO2 + 4H2O. The ratio of mole number of C3H8 and O2 is 1:5. 0.025g equals to 0.025/44.1=0.00057 mole. So the mass of O2 is 0.00057*5*32=0.0912 g.

6 0

2 years ago

Consider the reaction when aqueous solutions of potassium hydroxide and ammonium nitrate are combined. The net ionic equation fo

Reil [10]

Answer: $OH^-(aq)+NH_4^+(aq)\rightarrow NH_3(g)+H_2O(l)$

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

$KOH(aq)+NH_4NO_3(aq)\rightarrow KNO_3(aq)+NH_3(g)+H_2O(l)$

The equation can be written in terms of ions as:

$K^+(aq)+OH^-(aq)+NH_4^+(aq)+NO_3^-(aq)\rightarrow K^+(aq)+NO_3^-(aq)+NH_3(g)+H_2O(l)$

Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.

The ions which are present on both the sides of the equation are potassium and nitrate ions and hence are not involved in net ionic equation.

Hence, the net ionic equation is :

$OH^-(aq)+NH_4^+(aq)\rightarrow NH_3(g)+H_2O(l)$

6 0

3 years ago

Behavior (defense mechanisms)definition

Gekata [30.6K]

A variety of usually unconscious mental processes used to protect oneself from shame, anxiety, loss of self-esteem, conflict, or other unacceptable feelings or thoughts, and including behaviors<span> such as repression, projection, denial, and rationalization.

(google)</span>

7 0

2 years ago