What is the atomic number of aluminum

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Answer 1

Answer:

The atomic number of aluminum is 13.

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Related Questions

A scientist designed a foam container to help keep frozen foods from melting. Which best explains how the foam works? It removes thermal energy from the air inside the container. It removes thermal energy from the frozen foods inside the container. It reduces the amount of thermal energy that is transferred from inside to outside the container. It reduces the amount of thermal energy that is transferred from outside to inside the container.

Answers

Answer:

It reduces the amount of thermal energy that is transferred from outside to inside the container.

Explanation:

Remember that thermal energy = heat. Also foam cannot remove thermal energy, it is an insulator meaning it prevents the transfer of thermal energy.

First choice: Foam cannot just remove thermal energy

Second: Again foam does not remove energy

Third: This would mean the heat would continue to stay in the container, leading to the frozen foods melting

Fourth: Correct, it reduces the amount of outside heat from entering the container, thus preventing melting

The foam helps by preventing the transfer of thermal energy from outside to inside the container. Option D is correct.

What is Thermal energy?The energy in the molecules is due to temperature. Thermal energy transfers always from high temperature to low temperature until equilibrium.

Here, the temperature of the frozen food is much lesser than the surrounding environment. The transfer of energy is from the environment to the food objects.

Therefore, the foam helps by preventing the transfer of thermal energy from outside to inside the container.

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Think of a chemical reaction that you've seen in your daily life. Write a 3-5 sentence paragraph, explaining what it is and how you know it was a chemical reaction.

Answers

Answer:

Baking soda mixed with Vinegar

Explanation:

This is a chemical reaction that I have seen in my daily life. Vinegar is acidic while baking soda is a base. The 2 mix together to form carbonic acid and sodium acetate from sodium and bicarbonate ions.

It occurred to me not too long ago that I have multiple chemical reactions happen every day when I eat. The chemicals in my saliva break down the food I am eating. The pH in saliva is higher, so it breaks down the carbohydrates in the food I'm eating preparing it to go into my stomach and digest. There are also many reactions that must occur during digestion, such as the stomach acid breaking down the food further.

I need helppp pleaseee

Answers

Answer:

9) 126.86 amu

10) 197.26 amu

11) 55.83531 amu

or 55.8 amu (to 3 s.f.)

13) 14.07 amu

Explanation:

Please see attached picture for full solution.

Helen recorded the following data about the half-life of a radioisotope. Radioactive Decay of Radioisotope A Grams of Radioactive Material Remaining Time (in billions of years) 200 0 100 1 50 2 25 3 12.5 4 6.25 5 Which of the following types of graphs could Helen use to best organize her data? A. bar graph B. line graph C. histogram D. circle graph

Answers

Answer:

Line graph

Explanation:

I did it on Study Island

Radioisotopes are substances that are radioactive and have atoms with an unstable nucleus. The data about the radioisotope can be best organized in a line graph. Thus, option B is correct.

What is a graph?

A graph is a tool used to represent the data that contains the numerical data and includes the vertices and points to show the numbers and information in a statistical way. It is used to represent the variables of the tables in an easy and understandable manner.

Graphs can be bars, points, lines, columns, bubbles, areas, pie charts, etc. The line graphs use lines to connect the individual variables and are used to track the changes in radioactive material over a time period. It can easily represent the half-life and the remaining time of the radioactive decay.

Therefore, option B. a line graph will be best to represent the information.

Learn more about graphs, here:

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