All categories

2 years ago

The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change that

Chemistry

1 answer:

Hunter-Best [27]2 years ago

8 0

Answer:

the molecules move more quickly and their average kinetic energy decreases :D

Explanation:

You might be interested in

Aluminum–lithium (Al–Li) alloys have been developed by the aircraft industry to reduce the weight and improve the performance of

brilliants [131]

Answer:

6.54% is the required concentration of lithium in an alloy (Al–Li).

Explanation:

Suppose 100 grams of an alloy of aluminium and lithium.

Density of an alloy = d $2.14 g/cm^3$

Volume of an alloy = V

$V=\frac{100 g}{2.14 g/cm^3}=46.73 cm^3$

Volume of aluminum = $v_1$

Mass of aluminum = x

Density of aluminum = $d_1=2.71 g/cm^3$

$v_1=\frac{x}{d_1}$

Volume of lithium = $v_2$

Mass of lithium = y

Density of lithium= $d_2=0.534 g/cm^3$

$v_2=\frac{y}{d_2}$

$x+y=100$ ..[1]

$v_1+v_2=V$

$\frac{x}{d_1}+\frac{y}{d_2}=46.73 cm^3$

$\frac{x}{2.71}+\frac{y}{0.534}=46.73$ ..[2]

Solving [1] and [2] :

we get :

x = 93.46 g

y = 6.54 g

Concentration of Li (in wt%) that is required:

$Li\%=\frac{6.54 g}{100 g}\times 100=6.54\%$

5 0

3 years ago

Sodium permanganate and iron(III) chloride are both dissolved in a beaker of water. In a double displacement reaction, two new p

Nastasia [14]

Answer: The balanced chemical equation is written below.

Explanation:

Double displacement reaction is defined as the reaction in which exchange of ions takes place.

$AB+CD\rightarrow CB+AD$

When sodium permanganate reacts with iron (III) chloride, it leads to the production of sodium chloride and iron (III) permanganate.

The chemical equation for the reaction of sodium permanganate and iron (III) chloride follows:

$3NaMnO_4(aq.)+FeCl_3(aq.)\rightarrow Fe(MnO_4)_3(s)+3NaCl(aq.)$

By Stoichiometry of the reaction:

3 moles of aqueous solution of sodium permanganate reacts with 1 mole of aqueous solution of iron (III) chloride to produce 1 mole of solid iron permanganate and 3 moles of aqueous solution of sodium chloride

Hence, the balanced chemical equation is written above.

7 0

3 years ago

If element A has an ionic charge of +2 and element B has an ionic charge of -3, what will be the formula for the compound create

Softa [21]

A3B2 because the oxidation numbers are the same as ionic charge just switch symbol and number. Then use the cross cross method and you get A3B2.

8 0

3 years ago

When 1.14 g of octane (molar mass = 114 g/mol) reacts with excess oxygen in a constant volume calorimeter, the temperature of th

maxonik [38]

I can't answer this question without knowing what the specific heat capacity of the calorimeter is. Luckily, I found a similar problem from another website which is shown in the attached picture.

Q = nCpΔT
Q = (1.14 g)(1 mol/114 g)(6.97 kJ/kmol·°C)(10°C)(1000 mol/1 kmol)
Q = +6970 kJ

8 0

3 years ago

Please balance the equation, putting the correct coefficient in each box.

Mariulka [41]

Answer: $Bi(OH)_3+3HNO_3\rightarrow 3H_2O+Bi(NO_3)_3$

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced equation will be:

$Bi(OH)_3+3HNO_3\rightarrow 3H_2O+Bi(NO_3)_3$

5 0

3 years ago