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3 years ago

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Which of following statement describe a liquids? A.A Liquids has both a definite shape and a definite volume B.A Liquid has neit

her definite a liquid C.A Liquid has a definite shape but not definite volume D.A liquid has a defiant volume but not a definite shape

1 answer:

SCORPION-xisa [38]3 years ago

7 0

Answer:

Answer is D

Explanation:

This is becasuse a liquid can take any shape of any container but will allways have the same volume.

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Photosynthesis is the reaction by which green plants convert water and carbon dioxide into glucose and oxygen using sunlight (ra

umka21 [38]

Answer:

Photosynthesis is considered an endothermic reaction, because during the process of photosynthesis, energy from the sun or sunlight is being absorbed.

Explanation:

Any chemical reactions that absorb heat energy from the surroundings to form products is termed the endothermic reaction.

4 0

2 years ago

How many joules of heat are absorbed to raise the temperature of 650 grams of water from 5.00c to it's boiling point, 100c

xenn [34]

Answer : The amount of heat absorbed are, 258485.5 J

Solution :

Formula used :

$Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})$

where,

Q = heat gained = ?

m = mass of water = 650 g

c = specific heat of water = $4.186J/g^oC$

$\Delta T=\text{Change in temperature}$

$T_{final}$ = final temperature = $100^oC$

$T_{initial}$ = initial temperature = $5^oC$

Now put all the given values in the above formula, we get the final temperature of copper.

$Q=650g\times 4.186J/g^oC\times (100-5)^oC$

$Q=258485.5J$

Therefore, the amount of heat absorbed are, 258485.5 J

7 0

3 years ago

Calculate ΔHrxn for the following reaction: Fe₂O₃(s)+3CO(g)→2Fe(s)+3CO₂(g) Use the following reactions and given ΔH′s. 2Fe(s)+3/

ExtremeBDS [4]

Answer : The enthalpy change of reaction is -23.9 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given final reaction is,

$Fe_2O_3(s)+3CO(g)\rightarrow 2Fe(s)+3CO_2(g)$ $\Delta H=?$

The intermediate balanced chemical reaction will be,

(1) $2Fe(s)+\frac{3}{2}O_2(g)\rightarrow Fe_2O_3(s)$ $\Delta H^o_1=-824.2kJ$

(2) $CO(g)+\frac{1}{2}O_2(g)\rightarrow CO_2(g)$ $\Delta H^o_2=-282.7kJ$

First we will reverse the reaction 1 and multiply equation 2 by 3 then adding both the equation, we get :

(1) $Fe_2O_3(s)\rightarrow 2Fe(s)+\frac{3}{2}O_2(g)$ $\Delta H^o_1=+824.2kJ$

(2) $3CO(g)+\frac{3}{2}O_2(g)\rightarrow 3CO_2(g)$ $\Delta H^o_2=3\times (-282.7kJ)=-848.1kJ$

The expression for final enthalpy is,

$\Delta H=\Delta H^o_1+\Delta H^o_2$

$\Delta H=(+824.2kJ)+(-848.1kJ)$

$\Delta H=-23.9kJ$

Therefore, the enthalpy change of reaction is -23.9 kJ

7 0

3 years ago

Which of the following is a nonrenewable resource?

Rudik [331]

the answer is C, natural gas.. hope it helps

6 0

3 years ago

Read 2 more answers

Why do chemical equations have to be equal

Darina [25.2K]

Answer:

Every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. Therefore, there must be the same number of atoms of each element on each side of a chemical equation.

Explanation:

YW :)

5 0

3 years ago