Chemistry Middle School

Fill in the blanks with the word that best completes each statement. Scientists develop knowledge by making ------------about the natural world that may lead to a scientific question. A scientific question may lead to a(n) -------------which can be tested. The results of ------------can lead to changes in scientific knowledge.

Answers

Answer 1

Answer:

1. observations

2. hypothesis

3. experimentation

Explanation:

Observations are made, Hypothesies are formed from observations, and experimnets help alter and comfirm hypothesis.

Answer 2

Answerobservations

2. hypothesis

3. experimentation

Explanation:

Observations are made, Hypothesies are formed from observations, and experimnets help alter and comfirm hypothesis.

Explanation:

Related Questions

Which statement is NOT true regarding natural vs. synthetic materials?
A) An example of a natural material is sand.
B) An example of a synthetic material is nylon.
C) Synthetic materials are made from natural resources.
D) Synthetic materials only have a negative impact on society.

Answers

Answer:

Option C

Explanation:

Answer:

Option C

Explanation:

How do Solids, Liquids and Gasses differ?

Answers

Answer:

A solid is the hardest state of matter and require a liquid to freeze and is firm and stable in shape. A liquid is a a substance that flows freely but is of constant volume and can form when gas is cooled down. A gas is a state of matter that has no fixed shape and no fixed volume.

Explanation:

Answer:

The first person is right.

1. Freedom of motion of their particles

2. How strongly particles attract each other

solid-----Constant shape and constant volume

liquid-----variable shape, constant volume

gas--------variable shape, variable volume

To know the ratio of different atoms present within the compound where we have to look at

Answers

Answer:

You can look that atoms in a form of liquid as you can't see the atoms

Explanation:

You will have to open that books where the ratio is written.And secondly you will go to the chemical store and buy which atoms which you want to look then you can see it

please answer this questions!!!

Answers

I. should be 2 and ii. Should be 6 Nd part 2 of it should be 8

1. The charge of the nucleus of element “X” is 8+
The nucleus of element “X” is pictured to have 8 protons and 8 neutrons.
The nucleus always has a positive charge based on the number of protons in it.
Each proton has a charge of +1. There are 8 protons, so the charge of the nucleus is +8.
Neutrons have no charge (also called a neutral charge) so the number of neutrons will not affect the charge of the nucleus.

2. The electrical charge of element “X” is -2 if two electrons are added to its valance shell.
Each electron has a charge of -1. There are 8 electrons in the photo and we are adding 2, which is a total of 10 electrons. This means the electrons have a total charge of -10.
A simple way to find the overall charge of an atom is to subtract the number of electrons from the number of protons.
8-10=-2
The 8 positive protons and 8 negative electrons cancel each other’s charges, leaving the atom with the charge of two electrons, 2-.

I hope I explained this well, feel free to ask any questions! Have a good day.

what is an interesting fact about the first 10 atoms in the periodic table??? Please answer..

Answers

The word atom comes from the Greek word atomos, which means “undivided” or “uncut.” The Greek philosopher Democritus coined the term in the 5th century BCE. Democritus believed atoms were units of matter that could not be cut into smaller pieces. Atoms became the fundamental units of matter and the building blocks of elements. Eventually, scientists learned about subatomic particles. While no chemical process can divide an atom, nuclear fission and decay can break them into smaller units.

Answer:

Although Dmitri Mendeleev is most often cited as the inventor of the modern periodic table, his table was just the first to gain scientific credibility. It wasn't the first table that organized the elements according to periodic properties.

There are about 94 elements on the periodic table that occur in nature. All of the other elements are strictly human-made. Some sources state more elements occur naturally because heavy elements may transition between elements as they undergo radioactive decay.

Technetium was the first element to be made artificially. It is the lightest element that has only radioactive isotopes (none are stable).

The International Union of Pure Applied Chemistry, IUPAC, revises the periodic table as new data becomes available. At the time of this writing, the most recent version of the periodic table was approved in December 2018.

The rows of the periodic table are called periods. An element's period number is the highest unexcited energy level for an electron of that element.

Columns of elements help to distinguish groups in the periodic table. Elements within a group share several common properties and often have the same outer electron arrangement.

Most of the elements on the periodic table are metals. The alkali metals, alkaline earths, basic metals, transition metals, lanthanides, and actinides all are groups of metals.

The present periodic table has room for 118 elements. Elements aren't discovered or created in order of atomic number. Scientists are working on creating and verifying elements 119 and 120, which will change the appearance of the table, though they were working on element 120 before element 119. Most likely, element 119 will be positioned directly below francium and element 120 directly below radium. Chemists may create much heavier elements that may be more stable because of the special properties of certain combinations of proton and neutron numbers.

Although you might expect atoms of an element to get larger as their atomic number increases, this does not always occur because the size of an atom is determined by the diameter of its electron shell. In fact, element atoms usually decrease in size as you move from left to right across a row.

The main difference between the modern periodic table and Mendeleev's periodic table is that Mendeleev's table arranged the elements in order of increasing atomic weight, while the modern table orders the elements by increasing atomic number. For the most part, the order of the elements is the same between both tables, though there are exceptions.

Lewis is running in a race. His muscles need oxygen. Which best describes how multiple systems interact to bring him into homeostasis? The circulatory stem brings oxygen to the respiratory system, which delivers oxygen to the muscular system. The respiratory system brings oxygen to the circulatory system, which delivers oxygen to the muscular system. The respiratory system brings oxygen to the circulatory system, which delivers oxygen to the skeletal system. The circulatory system brings oxygen to the respiratory system, which delivers oxygen to the skeletal system.

Answers

the respiratory system brings oxygen to the circulatory system, which delivers oxygen to the muscular system

Which is an example of how the body maintains homeostasis? by increasing thirst when cells are low on water by decreasing thirst when cells are low on water by shivering when it is hot by sweating when it is cold

Answers

Answer:

increasing thirst when cells need water

Explanation:

hope this helps

Answer:

By increasing thirst when cells are low on water

Explanation:

Because your body needs more water so homeostasis kicks in to balance.

a) The formula of a compound is AB. If the valency of B is 3, what will be the valency of A? b) Baking soda is a white solid and has the formula NaHCO3. How many of each type of atoms are there in it?

Answers

Answer:

The valency of B will be 5

Baking soda contains one sodium atom, one hydrogen atom, one carbon atom, and three oxygen atoms

Explanation:

Hope it will help you:)

Answer:The valency of B will be 5

Baking soda contains one sodium atom, one hydrogen atom, one carbon atom, and three oxygen atoms

Explanation:

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