Answer:
False
Explanation:
Depends mostly on heating of the earths surface being uneven
Answer:
-3.82ºC is the freezing point of solution
Explanation:
We work with the Freezing point depression to solve the problem
ΔT = m . Kf . i
ΔT = Freezing point of pure solvent - freezing point of solution
Let's find out m, molality (moles of solute in 1kg of solvent)
15 g / 58.45 g/mol = 0.257 moles of NaCl
NaCl(s) → Na⁺ (aq) + Cl⁻(aq)
i = 2 (Van't Hoff factor, numbers of ions dissolved)
m = mol /kg → 0.257 mol / 0.250kg = 1.03 m
Kf = Cryoscopic constant → 1.86 ºC/m (pure, for water)
0ºC - Tºf = 1.03m . 1.86ºC/m . 2
Tºf = -3.82ºC
Answer:
12 molecules of carbon dioxide
24 molecules of water
Explanation:
Given parameters:
Number of molecules of methane = 12 molecules
Unknown:
Number of molecules of carbon dioxide = ?
Number of molecules of water = ?
Solution:
The given amount of methane is the limiting reagent in this reaction. By this, we can ascertain the amount of products that will be formed and the extent of the reaction.
We first write the balanced chemical equation for this reaction;
CH₄ + 2O₂ → CO₂ + 2H₂O
From balanced equation;
1 mole of methane produced 1 mole of carbon dioxide
12 molecules of methane will produce 12 molecules of carbon dioxide
Also;
1 mole of methane produced 2 moles of water;
12 molecules of methane will produce (12 x 2)molecules = 24 molecules of water
Answer:
- See the biohazard symbol in the picture attached.
Explanation:
I downloaded the biohazard symbol from internet and attached it to this answer to show you how it is.
The presence of <em>blood, tissues, virus or bacteria</em> represent a risk of contamination or transmission of diseasses that must warned to avoid accidental contact that compromises the health of and individual or community.
As the question states you should <em>wear gloves</em> to avoid direct contact of your skin with those contaminants. Also, they should be dispossed properly, meaning that they must be handled by a specialized company.
That symbol, for example, must be exhibited at hospitals where biological wastes are temporarily stored pending collection by a company specializing in the management and disposal of biological waste.
Answer:
The quantity of heat required to raise the temperature of 500 g of iron by 2°C is 500 J.
Explanation:
Calorimetry is responsible for measuring the amount of heat generated or lost in certain physical or chemical processes.
The sensible heat of a body is the amount of heat received or transferred by a body when undergoing a temperature variation (Δt) without there being a change in physical state (solid, liquid or gaseous).
Its mathematical expression is the fundamental equation of calorimetry. This is:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case:
- Q= ?
- c= 500
- m= 500 g= 0.500 kg
- ΔT= 2 C
Replacing:
Q= 500 *0.500 kg*2 C
Solving:
Q= 500 J
<u><em>The quantity of heat required to raise the temperature of 500 g of iron by 2°C is 500 J.</em></u>