On a temperature versus time graph, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?

Answers

Answer 1

Answer: The temperature is the same. During a phase change, a sample is gaining heat with out a change in temperature since all of the energy is being put into the breaking of the intermolecular forces which makes it so that the average kinetic energy of the particles in the substance does not change (the energy is not used to speed up the particles). I hope this helps. Let me know if anything is unclear. (I used a phase change that is gaining heat shuch as boiling and if you reverse my explanation it explains a phase change that is loosing heat such as freezing).

Answer 2

Answer:

Answer : always the same

i took the test lol

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Group 1A element sodium combines with Group 7A element chlorine to form sodium chloride or table salt. Based on this information, which expression is true about the electronegativity values of these two elements? Na > Cl Na < Cl Na = Cl We cannot make a prediction with the data provided. NextReset

Answers

The answer is Na < Cl

Chlorine is more electronegative than sodium because this follows the trend of the periodic table. The trend states that an element's electronegativity increases from left to right of a period and bottom to up of a group. Since sodium and chlorine are from the same period, and chlorine is at the right of sodium, chlorine is more electronegative.

What is the mass of NH4Cl that must dissolve in 200. grams of water at 50.°C to make a saturated solution?(1) 26 g (3) 84 g
(2) 42 g (4) 104 g

Answers

Answer: It's 104 g

Explanation: yes

at 50ºC:

50 g NH₄Cl----------------- 100 g (H₂O)
? mass NH₄Cl------------- 200 g (H₂O)

mass NH₄Cl = 200 . 50 / 100

mass

In which type of chemical reaction do two or more reactants combine to form one product, only?(1) synthesis
(2) decomposition
(3) Single replacement(4) double replacement

Answers

In decomposition, two or more reactant combine to form one product only.

Answer:

A.) synthesis

Explanation:

edge 2021

How many aluminium atoms are there in the formula for aluminium nitrate ?

Answers

The formula for Aluminium Nitrate is $Al(NO _(3) )_(3)$ .

This is because aluminium has a 3+ charge and nitrate has a 1- charge, so you need 3 of them to balance out aluminium.

Therefore, you have one ion of aluminium.

If a person's gallbladder were removed by surgery, which of the following substances would he have the most difficulty digesting? a. carbohydrates b. nucleic acids c. fats d. proteins

Answers

Explanation:

Fats

The gallbladder stores bile ( made in the liver) which is secreted into the digestive tract to aid in the digestion of dietary fats.

Sometimes people say that the air is thinner high up on a mountain is that true

Answers

Answer:

Yes

Explanation:

As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level. This is what is meant by "thin air".

Answer:

Yes because the air becomes less compressed and is therefore thinner.

Explanation:

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