Question

Помогите пожалуйста)))Очень срочно!!!! У калориметрі містилась холодна вода масою 50 г за температури 20°C. У нього долили горячю воду , температура якої 80°C, після чого в калориметрі встановилася температура 60°C. Позначте, які з наведених тверджень правельні, а які неправельні. А. Маса холодної води є більшою, ніж 120 г.Б. Гаряча вода передала холодній кількість теплоти , що перевищує 5 кДж.В. маса гарячої води є більшою, ніж 80г.Г. Гаряча вода передала холодній кількість теплоти, меншу від 10 кДж.​

Answer 1

Ответ:

Правильні:Б ; B. Неправильні: А

Объяснение:

Answer 2

Background Information

In this problem, we have a calorimeter containing cold water with a mass of 50 g at a temperature of 20°C. Hot water at a temperature of 80°C is added to the calorimeter, and the final temperature of the mixture is 60°C. We need to determine which of the given statements are correct and which are incorrect.

Analysis of Statements

Let's analyze each statement and determine if it is true or false based on the given information.

A. The mass of the cold water is greater than 120 g. This statement is false. The problem states that the mass of the cold water is 50 g, which is less than 120 g.

B. The hot water transferred more than 5 kJ of heat to the cold water. This statement is true. To determine the amount of heat transferred, we can use the principle of heat exchange:

Q_hot + Q_cold = 0

where Q_hot is the heat transferred from the hot water and Q_cold is the heat transferred to the cold water.

We know that the final temperature of the mixture is 60°C, which is between the initial temperatures of the hot and cold water. This means that heat is transferred from the hot water to the cold water until they reach thermal equilibrium.

Using the equation:

Q = m * c * ΔT

where Q is the heat transferred, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature, we can calculate the heat transferred from the hot water to the cold water.

Let's assume the specific heat capacity of water is approximately 4.18 J/g°C.

For the hot water: Q_hot = m_hot * c * (T_final - T_hot) Q_hot = m_hot * 4.18 * (60 - 80)

For the cold water: Q_cold = m_cold * c * (T_final - T_cold) Q_cold = m_cold * 4.18 * (60 - 20)

Since the calorimeter is an isolated system, the heat transferred from the hot water is equal to the heat transferred to the cold water:

Q_hot = -Q_cold

Therefore, the absolute value of Q_hot is greater than 5 kJ.

C. The mass of the hot water is greater than 80 g. This statement is false. The problem does not provide any information about the mass of the hot water.

D. The hot water transferred less than 10 kJ of heat to the cold water. This statement is true. As explained in statement B, the absolute value of the heat transferred from the hot water to the cold water is greater than 5 kJ. Therefore, it is less than 10 kJ.

Summary

Based on the given information, we can conclude that the correct statements are: - B. The hot water transferred more than 5 kJ of heat to the cold water. - D. The hot water transferred less than 10 kJ of heat to the cold water.

The incorrect statements are: - A. The mass of the cold water is greater than 120 g. - C. The mass of the hot water is greater than 80 g.

Please let me know if you need any further clarification or assistance!