Answer:
1. Granite
2. 535.5J
Explanation:
1. The lower the specific heat capacity of a substance, which is the amount of heat needed to raise the temperature of a particular mass of substance by 1 °C or K, the slower the rate at which the temperature is raised.
In this question 1, the substance with the lowest specific heat capacity in J/gK is GRANITE, hence, it will raise temperature the slowest.
2. Using the formula as follows:
Q = m × c × ∆T
Where;
c = specific heat capacity
Q = amount of heat (J)
m = mass of substance
∆T = change in temperature (°C)
m = 35g, c = 0.45 J/g°C, ∆T = 54°C - 20°C = 34°C
Q = 35 × 0.45 × 34
Q = 535.5J
Answer:
Mixture
Explanation:
Jewelry is a Mixture. This is because of the variation in it's composition.
Elements
Elements are pure substances. The fact that jewelry gold is mixed with other medals means it is no longer a single entity, hence not an element.
Compound
Compound are substances that are bonded together with a fixed composition. This means the jewelry gold is not a compound
Answer the correct answer for the question is option a Increase in temperature of water.
Explanation- When the temperature of water is increased the energy of water is increased at molecular level, this increased energy causes vibration between the hot water molecules bit faster than in normal water which also allows the sugar molecules to vibrate and associate with water at molecular level as it gets more space between the molecules.
Hence this action would make sugar more soluble in water.
<u>Answer:</u> The molarity of KBr solution is 0.605 M
<u>Explanation:</u>
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L.
The formula used to calculate molarity:
.....(1)
Given values:
Given mass of KBr = 54.0 g
Molar mass of KBr = 119 g/mol
Volume of the solution = 750 mL
Putting values in equation 1, we get:
Hence, the molarity of KBr solution is 0.605 M
