CHEMISTRY MIDDLE SCHOOL

How to I find the number of electrons in and Atom?

Answers

Answer 1
Answer: Look at the atomic number of an element on the periodic table which is the smaller number.
The atomic number shows the number of protons/electrons so the number of protons and electrons are the same.
Whereas the mass number of an element (the other number) is the number of protons + neutrons.

Related Questions

Using the following equation:Fe2O3(s) + 3 H2(g) → 2 Fe(s) + 3 H2000)a) How many grams of iron can be made from 6 moles H2​
How do I do this Phenomenal Based writing: Dont mess up the cookies worksheet? I need the answers asap please!!
What is the answer??
Joshua has invented a special greenhouse. By turning a special dial in his new greenhouse, Joshua can choose which type of sunlight can enter the greenhouse. When only ultraviolet light is allowed to enter the greenhouse, what will happen while Joshua is standing inside the greenhouse?Joshua can see objects inside the greenhouseAs time passes, it becomes warmer inside the greenhouse than it is outsideJoshua can see objects outside the greenhouseAs time passes, Joshua begins to sunburn
Convert 2.70atmtotorr

Why burning methane does not produce acid rain

Answers

In this exercise we have to use our knowledge of acid rain, as:

Only methane fires will not produce acid rain since acid rain usually occurs in areas of high population concentration, industries and with high levels of emission of pollutants such as CO2 and methane.

What causes acid rain?

The main consequences of acid rain are: The soil can change when acid rain reaches the surface, becoming acidified. Soil contamination can also cause contamination of water courses, such as rivers and lakes, as well as underground water reserves.

See more about acid rain at brainly.com/question/53991
Methane is a thick substance not allowing it to fill the air and it is also a natural gas, so it would cause no harm.

When elements combine to form compounds does there properties change?

Answers

Yes, they do. The process described is a chemical reaction and it implies the change of nature of reactants and, of course, the change of its properties.

Which two of these are chemical reactions? Tick two boxes.



You
dissolve a spoonful of sugar in water.
 


Bread goes
brown in the toaster.
 


You take an
ice lolly out of the freezer and it strats to melt.
 


Frost forms on
the grass an a cold night.
 


You strike a
match to light a Bunsen burner.
 

Answers

Strike a match and a spoon of sugar
The second one and the fifth one.

Bread goes brown in toaster and lighting a burner.

Reason: - Both the actions involve combustion; which is a chemical change.

Help on question 1b please? (image attached)

Answers

I believe your answer Is C. An ammonia molecule has a trigonometrical pyramidal shape. Figure C has a has a trigonometrical pyramidal shape.

I hope I help

The speed of light is used to determine the length of a light-year. About how far does light travel in one second? A. 30 km B. 3,000 km C. 30,000 km D. 300,000 km

Answers

The answer would be D. 300,000 km/s

Which of the following best describes a person doing science? A. Dominick uses a computer to do his math homework. B. Lindsay measures the sizes of the craters on the Moon. C. Isabel invents a new kind of doorknob. D. Murray randomly predicts the result of a coin toss.

Answers

The correct answer is B. Lindsay measures the sizes of the craters on the Moon, is the best description of a person doing science.

Science is the practical and intellectual pursuit of the understanding of the physical and natural world that surrounds us. It involves a systematic study: observation,  experimentation, data analysis, discussion and conclusion. Science is the human effort to gather knowledge about the universe.


Answer:

B.

Explanation:
Other Questions
PLEASE for the love of god answer these questions for me!!!! It’s urgent. 1. Some igneous rock forms from magma that cools slowly within Earth’s crust. Briefly describe the most likely crystallization and texture of the rock.2. Other igneous rock forms from lava that cools quickly on Earth’s surface. Classify the rock as either intrusive or extrusive, and identify another word used to describe this type of rock.3. You are studying a sample of igneous rock. The rock formed on the surface of Earth. It’s made mostly of light-colored minerals. The sample has just a few specks of dark-colored minerals. Classify the rock by type and composition.4. You are studying a sample of igneous rock. The rock formed within Earth’s crust. The sample contains a very high concentration of dark-colored, high-density minerals. Classify the rock by type and composition.5. A scientist shows you a sample of rock called gabbro. The scientist explains that gabbro is an intrusive mafic igneous rock. Explain what this means.
Where can you find hydrochloric acid in your body? What does it do?
Which is the most likely reason why an aerosol can explodes when it is thrown into a fire?Heated air particles flow from the atmosphere into the can.The metal in the can expands due to the heat of the fire.The particles in the can move more slowly until they join together.Heat causes the gas particles in the can to move faster and farther apart.
What is the correct formula for iron(III) oxide?