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3 years ago

PLEASE HELP!!!! WILL GIVE BRANLIEST!!

Chemistry

2 answers:

NISA [10]3 years ago

6 0

Answer:

help with what...

........

Korvikt [17]3 years ago

3 0

Phenolphthalein is in pink colour. it will turn colourless if the solution become neutral. the lemon is acidic. so it will not change colour. please mark me brainliest

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If you combine 230.0 mL 230.0 mL of water at 25.00 ∘ C 25.00 ∘C and 120.0 mL 120.0 mL of water at 95.00 ∘ C, 95.00 ∘C, what is t

Thepotemich [5.8K]

Answer: The final temperature of the mixture is 49°C

Explanation:

To calculate the mass of water, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

For cold water:

Density of cold water = 1 g/mL

Volume of cold water = 230.0 mL

Putting values in above equation, we get:

$1g/mL=\frac{\text{Mass of water}}{230.0mL}\\\\\text{Mass of water}=(1g/mL\times 230.0mL)=230g$

For hot water:

Density of hot water = 1 g/mL

Volume of hot water = 120.0 mL

Putting values in above equation, we get:

$1g/mL=\frac{\text{Mass of water}}{120.0mL}\\\\\text{Mass of water}=(1g/mL\times 120.0mL)=120g$

When hot water is mixed with cold water, the amount of heat released by hot water will be equal to the amount of heat absorbed by cold water.

$Heat_{\text{absorbed}}=Heat_{\text{released}}$

The equation used to calculate heat released or absorbed follows:

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

$m_1\times c\times (T_{final}-T_1)=-[m_2\times c\times (T_{final}-T_2)]$ ......(1)

where,

q = heat absorbed or released

$m_1$ = mass of hot water = 120 g

$m_2$ = mass of cold water = 230 g

$T_{final}$ = final temperature = ?°C

$T_1$ = initial temperature of hot water = 95°C

$T_2$ = initial temperature of cold water = 25°C

c = specific heat of water = 4.186 J/g°C

Putting values in equation 1, we get:

$120\times 4.186\times (T_{final}-95)=-[230\times 4.186\times (T_{final}-25)]$

$T_{final}=49^oC$

Hence, the final temperature of the mixture is 49°C

4 0

4 years ago

Sean drew this diagram and labeled an unknown gas A. Which gas does A represent?

Aneli [31]

The Correct answer is Carbon dioxide CO2.

The Explanation:

according to the diagram:

we can see that the arrows which going to A are from:

1- respirition of the tree . and the CO2 gas is the result and produced gas from respiration.

2- The Combustion went from Home : and the CO2 gas is also the produced gas from the combustion process.

∴ (A) refers to CO2 (carbon dioxide) gas.

4 0

4 years ago

Read 2 more answers

Hello guys sorry for spamming again but I have to do this whole thing and the end of trimester for my school is today so I need

Aloiza [94]

Answer:

all you need if yo look up and say do plants grow without soil but yes they can grow without soil but they cannot grow without the necessities that soil provides.

4 0

3 years ago

What is the word equation for atoms of magnesium reacting with molecules of oxygen to produce magnesium oxide?

Kazeer [188]

Answer:

The "word equation" is Magnesium + Dioxygen → Magnesium Oxide

Explanation: This is also the same as Mg + O₂ → MgO.

5 0

2 years ago

you are given a sample containing 0.70 moles of a substance how many atoms are in the sample if the substance is platinum ?

marin [14]

1 mole ------------- 6.02 x 10²³ atoms
0.70 moles -------- ( atoms platinum )

atoms platinum = 0.70 x ( 6.02 x 10²³ ) / 1

= 4.2 x 10²³ atoms platinum

hope this helps!

6 0

3 years ago