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4 years ago

The crucial difference between relative dating and absolute dating is that

Chemistry

2 answers:

Gwar [14]4 years ago

8 0

Answer:c

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IRISSAK [1]4 years ago

3 0

Answer: C.

Explanation: Relative dating is the technique used to know which object or item is older in comparison to the other one. The absolute dating is the technique which tells about the exact age of the artifact or the site using the methods like carbon dating.

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Which of these compounds has the highest boiling point?

galina1969 [7]

Answer:

2-Pentanone is the answer.

Explanation:

4 0

3 years ago

Jeff used an equal arm balance to weigh a 4.312 g sample of sodium chloride. Which of these measurements made by Jeff is the mos

Damm [24]

Option B: 4.3

There are following rules for rounding off numbers:

1. If the rounding digit has digit less than 5 (1,2,3 and 4) to its right, all the digits on right side of the rounding digit will drop out.

2. If the rounding digit has digit equal and greater than 5 (5,6,7,8 and 9) to its right, one is added to the rounding digit.

Jeff has to weigh 4.312 g sample of NaCl. To round off the underline number 4.<u>3</u>12, check for the digit right to it. It has 1, which is less than 5 thus according to the Rule 1, all the digits on right side of the rounding digit will drop out and the number gets rounded off to 4.3.

Therefore, 4.3 is most accurate measurement by Jeff.

7 0

3 years ago

Read 2 more answers

NEED HELP ANSWERING THIS QUESTION

victus00 [196]

Answer:

I think the answer is A.

please give thanks if it helps

and sorry if it doesn't help.

4 0

3 years ago

A vessel of volume 100 cm3 contains 0.25 mol o2 and 0.034 mol co2 at 10.0c. Calculate the partial pressure of each component and

Artyom0805 [142]

Answer: The partial pressure of oxygen is 76.56 atm , partial pressure of carbon dioxide is 10.44 atm and the total pressure is 87 atm.

Explanation:

According to the ideal gas equation:'

$PV=nRT$

P = Pressure of the gas = ?

V= Volume of the gas = $100cm^3=0.1L$ $1L=1000cm^3$

T= Temperature of the gas = 10°C = 373 K

R= Gas constant = 0.0821 atmL/K mol

n= moles of gas= 0.25 +0.034 = 0.284 moles

$P=\frac{nRT}{V}=\frac{0.284\times 0.0821\times 373}{0.1}=87atm$

$x_{O_2}$ = mole fraction of oxygen= $\frac{\text {moles of }O_2}{\text {moles of }O_2+\text{moles of }CO_2}=\frac{0.25}{0.25+0.034}=0.88$ ,

$x_{CO_2}$ =mole fraction of carbon dioxide= $\frac{\text {moles of }CO_2}{\text {moles of }O_2+\text{moles of }CO_2}=\frac{0.034}{0.25+0.034}=0.12$

partial pressure of oxygen = $p_{O_2}=x_{O_2}\times P=0.88\times 87=76.56atm$

partial pressure of carbon dioxide= $p_{CO_2}=x_{CO_2}\times P=0.12\times 87=10.44atmatm$

The partial pressure of oxygen is 76.56 atm , partial pressure of carbon dioxide is 10.44 atm and the total pressure is 87 atm.

8 0

3 years ago

Write the chemical equation of the reaction with a change in colour

Lelu [443]

Answer:

(i) Change in colour (ii) Change in temperature (iii) Formation of precipitate

Explanation:

(i) Change in colour: Reaction between lead nitrate solution and potassium iodide solution. Pb(NO3)2(aq)+2KI → PbI2(s)+2KNO3(aq) In this reaction, colour changes from colourless to yellow. (ii)Change in temperature: Action of dilute sulphuric acid on zinc. Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2 In this reaction, heat is evolved (iii) Formation of precipitate: Action of barium chloride on sodium sulphate. BaCl2(aq) +Na2SO4(aq) → BaSO4(s) +2NaCl(aq) BaSO4(s)

8 0

3 years ago