109kPa = ________

A piece of glass has a temperature of 83˚C. Liquid that has a temperature of 43˚C is poured over the glass, completely covering

Lerok [7]

Answer: The specific heat of the liquid is $2520J/kg^0C$

Explanation:

$heat_{absorbed}=heat_{released}$

As we know that,

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

.................(1)

where,

q = heat absorbed or released

= mass of glass = x kg

= mass of liquid = x kg

= final temperature =

$T_1$ = temperature of glass = $83^oC$

$T_2$ = temperature of liquid = $43^oC$

$c_1$ = specific heat of glass = $840J/kg^0C$

$c_2$ = specific heat of liquid= ?

Now put all the given values in equation (1), we get

$-[(x\times 840\times (53-83)]=x\times c_2\times (53-43)$

$c_2=2520J/kg^0C$

Therefore, the specific heat of the liquid is $2520J/kg^0C$

5 0

3 years ago

What is the compound h2so4?

Irina-Kira [14]

Sulfuric acid is the answer

4 0

3 years ago

Read 2 more answers

The balanced chemical equation for the reaction between PCl5 and water is given below. If 3.45 moles of HCl are produced, how ma

enyata [817]

The coefficients of the substances give you the ratio of the number of moles.
The 4 before the H2O and the 5 before the HCl tell you that for every 5 moles of HCl created, 4 moles of H2O had to react.

Therefore:
$(3.45mol HCl)(\frac{4 mol H2O}{5 mol HCl})$
can be used to find the moles of H2O that react.

$(3.45mol HCl)(\frac{4 mol H2O}{5 mol HCl}) = 2.76 mol H20$

6 0

3 years ago

Balance the equation and identify the type of reaction for ? P4(s) + ? Ca(s) → ? Ca3P2(s). 1. 2; 6; 2 — decomposition 2. 2; 6; 2

pishuonlain [190]

Answer:

4. 1; 6; 2 — synthesis

Explanation:

Decomposition reaction is defined as the reaction in which a single large substance breaks down into two or more smaller substances.

$AB\rightarrow A+B$

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.

The reactivity of metal is determined by a series known as reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the series.

$A+BC\rightarrow AC+B$

Synthesis reaction is defined as the reaction in which smaller substances combine in their elemental state to form a larger substance.

$A+B\rightarrow AB$

The unbalanced combustion reaction is shown below as:-

$P_4+Ca\rightarrow Ca_3P_2$

On the left hand side,

There are 4 phosphorus atoms and 1 calcium atom

On the right hand side,

There are 2 phosphorus atoms and 3 calcium atoms

Thus,

Right side, $Ca_3P_2$ must be multiplied by 2 to balance phosphorus.

Left side, $Ca$ is multiplied by 6 so to balance the whole reaction.

Thus, the balanced reaction is:-

$P_4+6Ca\rightarrow 2Ca_3P_2$

Thus, answer:- 4. 1; 6; 2 — synthesis

5 0

3 years ago

Write the electronic configuration of aluminium in terms of sub shell

butalik [34]

Answer:

The Aluminium electron configuration will be 1s^22s^22p^63s^23p^1. The configuration notation provides an easy way for scientists to write and communicate how electrons are arranged around the nucleus of an atom. This makes it easier to understand and predict how atoms will interact to form chemical bonds.

3 0

2 years ago

109kPa = _________ mm Hg