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3 years ago

1. Select all the statements about the nucleus of the atom that are correct:

Chemistry

1 answer:

erik [133]3 years ago

8 0

Answer:

Explanation:

1. Select all the statements about the nucleus of the atom that are correct:

Group of answer choices

B. It contains Protons

D. It has a Positive Charge

E. It contains Neutrons

2. An atom of an element with atomic number 50 and mass number 120 contains:

Group of answer choices

B. 50 protons, 50 electrons, and 70 neutrons

3. Which of these statements is false?

Group of answer choices

D. Electrons have the same mass as a proton but have the opposite charge.

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How much would the temperature of 275 g of water increase if 36.5 kj of heat were added?

Andrew [12]

Answer: The temperature increase will be 31.70°C.

Explanation:

To calculate the increase in the temperature of the system, we use the equation:

$q=mc\Delta T$

where,

q = Heat absorbed = 36.5 kJ = 36500J

m = Mass of water = 275 g

c = Specific heat capacity of water = $4.186J/g^oC$

$\Delta T$ = change in temperature = ? °C

Putting values in above equation, we get:

$36500J=275\times 4.186J/g^oC\times \Delta T\\\\\Delta T=31.70^oC$

Hence, the temperature increase will be 31.70°C.

8 0

3 years ago

Read 2 more answers

Method A: Does not transfer heat through solids and requires a medium for heat transfer Method B: Requires a material medium and

Paha777 [63]

Method A is Convection

Method B is Conduction

Explanation:

From the problem, we can infer that method A is convection and method B is conduction.

Conduction, convection and radiation are the three main methods of heat transfer.

Conduction and convection requires material medium to propagate.
Radiation occurs in the absence of a material medium.
Conduction mostly occurs in solid. Here, heat is transferred from one hot end to the cold end of the solid. The vibration of the particles in the hot end causes the transfer of kinetic energy to the cold end until thermal equilibrium is reached.
In convection, heat is primarily transferred in fluids as a result of density differences. Convection involves the motion of the materials of the medium. Hot air is light and it rises whereas cold air is dense and it sinks.

Learn more:

Sun brainly.com/question/1140127

#learnwithBrainly

6 0

3 years ago

Kesha is in charge of dying boiled eggs with her cousins, C.J and Carvin. She read on the directions that you add 2 tablespoons

marin [14]

Answer:

Independent: The amount of vinegar

Dependent: The dye result on the egg

Controlled: The type of eggs, the size of jars, the dye tablet, how much she stirs, etc.

Explanation:

The independent variable is what is being changed, which in this case, is the amount of vinegar being added to each jar. The dependent variable is what is being measured or observed. Kesha is looking for what happens to the egg when she adds more vinegar with the dye. Lastly, there could be a couple of controlled variables. Like, the dye tablet, the size and brand of the eggs, the types of jars, how long she stirs each egg, and so on. The controlled are just variables kept constant so that any result observed is because of one singular change, the independent variable.

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3 years ago

A process in which one or more substances change to make one or more new substances is called a

svetlana [45]

The answer to your question is: Chemical Reaction.

8 0

3 years ago

Question 13 (1 point) What is the number of neutrons for Silicon-31 14 31 15 29

marta [7]

Answer:

the number of neutrons for silicon is 14

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3 years ago