HELP ME!!!!
Which item in Figure 1 expanded the least when heated?

steel
oak
aluminum
glass

Answer:

Matter has particles called atoms.

They are indestructible and unchangeable.

When chemical reactions occur, they combine.

Categorized by weight of atoms.

Explanation:

Answer:

Matter has particles called atoms. They are indestructible and unchangeable. When chemical reactions occur, they combine.

Explanation:

Answer:

electons are added moving to the right

Explanation:

The decrease in atomic radius with increasing atomic number is best explained by the number of protons increasing and the number of shells of electrons remaining the same. Therefore, option (A) is correct.

The atomic radius of an atom can be described as the size of the atom, which is generally the mean distance from the center of the nucleus to the outermost electron of an atom.

In the periodic table,  as you move from left to right, the atomic number of elements in period 2 will continue to increase, because there is an increase in the number of protons which causes an increase in positive charge carried by each element while the number of shells of the electrons remains constant.

Therefore the Elements will attract more negative charges to themselves as we move from left to right in the period. As the atomic number of elements increases, there will be a decrease in the atomic radius of the elements.

Hence, the decrease in atomic radius with increasing atomic number is explained by the number of protons increasing and the number of shells of electrons in an atom remaining the same.

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Your question is incomplete most probably the complete question was,

As the elements in Period 2 of the Periodic Table are considered in succession from left to right, there is a decrease in atomic radius with increasing atomic number. This may best be explained by the fact that the

a. number of protons increases, and the number of shells of electrons remains the same

b. number of protons increases, and the number of shells of electrons increases

c. number of protons decreases, and the number of shells of electrons remains the same

d. number of protons decreases, and the number of shells of electrons increases

Answer:

compound

Explanation:

because now there are one together

Answer:

When popcorn is popped, liquid inside the kernel is changed to steam. Pressure from the steam builds up inside the kernel. When the pressure reached a critical stage the kernel pops turning itself inside out. This is a physical change.

Explanation:

Answer:

The answer is E ( synthesis)

During cellular respiration, glucose is broken down in the presence of oxygen to produce carbon dioxide and water. Energy released during the reaction is captured by the energy-carrying molecule ATP (adenosine triphosphate). Summary, Cellular respiration is the aerobic process by which living cells break down glucose molecules, release energy, and form molecules of ATP. Overall, this three-stage process involves glucose and oxygen reacting to form carbon dioxide and water.

The molar mass of NaOH is 40g, so 0.5mol is 20g

The molar mass of Na is 23g, O is 16g and H is 1g (total 40g), so in this case we have

Na 11.5g, O 8g and H 0.5g (total 20g)

The mole is represented by Avogadro's number, which is 6.022 × 1023 atoms or molecules per mol.

Answer: 65

Explanation: Cause il

Answer:

The correct answer is tetrahedral

Explanation:

Molecular geometry can be described as the three dimensional structure of atoms in a molecule. It is usually preferable to draw out the lewis dot structure of a compound before using that to determine the molecular geometry of the compound. The lewis dot structure and the tetrahedral structure of phosphoryl iodide (POI₃) are in the attachment below.

As it can be seen in the attachment, the molecular geometry of phosphoryl iodide is tetrahedral.

Answer:

21.3g

Explanation:

The formula of the compound is;

        Fe(NO₃)₃

Given:

volume  = 500mL  = 0.5L

concentration  = 0.175mol/L

Unknown:

Mass of  Fe(NO₃)₃ measured = ?

Solution:

To solve this problem, find the number of moles first;

      Number of moles of  Fe(NO₃)₃ = concentration x volume

 So;

      Number of moles  = 0.175 x 0.5   = 0.088mol

Now to find the mass;

  Mass  = number of moles x molar mass

      Molar mass of  Fe(NO₃)₃ = 55.8 + 3[14 + 3(16)]

       Molar mass of  Fe(NO₃)₃ = 55.8 + 3(62) = 241.8g/mol

  Mass = 0.088mol x 241.8g/mol  = 21.3g

Answer:

Advantages of fossil fuels:

Explanation:

One advantage of fossil fuels is that they are easy to find, they are also pretty efficient despite the pollution it causes, and lastly it provides tons of economic prosperity to many countries.

Answer:

negative

Explanation:

There is decrease of a character in the new progeny so it is negative mutation

Negative kind of mutation is occur in a gene causing a pea plant produce 75% fewer leaves.

If any chemical or physical alteration is occured due to change in the sequence of nucleotide in the DNA is known as mutation.

In plants mutation is natural phenomenon and as a result of mutation, different colors or shades on leaves and flowers are observed. Many other alteration is also noticed which may get normal in future. In the question it is given that due to mutation, pea plant produces 75% less leaves than the normal production.

Hence, in the pea plant negative mutation occurs.

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Answer:

A

Explanation:

Answer:b

Explanation:

Explanation:

oxygen and are negatively charged anions because the oxygen atoms attract electrons. Ammonium is one of the few positively charged polyatomic ions or cations and doesn't contain oxygen.

Answer:

non metal atoms

Explanation:

Lincoln learning test

Answer:

Atoms must have similar electronegativities in order to share electrons in a covalent bond.

Explanation:

Covalent bonding is one of the bondings that occurs between the atoms of elements. It is the bonding in which atoms share their valence electrons with one another. However, the ELECTRONEGATIVITY, which is the ability of an atom to be attracted to electrons play a major role in the formation of covalent bonds.

When atoms of different electronegativities combine, the more electronegative atom pulls more electrons towards itself, hence, an IONIC bond is formed. However, when the electronegativities of the atoms are similar, the sharing of their electrons becomes stronger. Hence, ATOMS MUST HAVE SIMILAR ELECTRONEGATIVITIES in order to share electrons in a covalent bond.

Answer:

A

Explanation:

Atoms must have similar electronegativities in order to share electrons in a covalent bond.

Answer:

i can send u all of the bio stuff i have maybe it will help

Explanation:

Explanation:

A column on the periodic table represents a period.

These are some of the variations observed across a period;

Answer:

C

Explanation:

It is c because that goes into heating and cooling and if nobody is home you should definetly turn off heating and cooling. This should be the correct answer.

Answer:

D. Carbon Dioxide

Explanation:

i may be wrong, but i believe its carbon dioxide

Dry ice has the same chemical properties as: D. Carbon dioxide.

A chemical property can be defined as the properties of a chemical compound (substance) that can be observed and measured during a chemical reaction.

Some examples of the chemical properties of a chemical compound (substance) are based on the following;

Basically, when dry ice experiences a phase change, it mainly transforms into carbon dioxide gas.

Hence, it is considered to have the same chemical properties as carbon dioxide such as:

I. Dry ice is an acidic oxide.

II. It has a high density.

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Answer:

1.

meteorology A line drawn on a map or chart connecting places of equal or constant pressure.

2.

nuclear physics Either of two nuclides of different elements having the same mass number.

3.

thermodynamics A set of points or conditions at constant pressure.

Answer:

a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.

Explanation:

Answer:

Chlorophyll

Explanation:

This is the green pigment that allows photosynthesis to occur

Mitochondria: cell energy

Cytoplasm: what fills the space between organelles in a cell

Chlorine: not sure but you they put it in pools

Answer: When this occurs, the particles bind with the chemicals and form larger particles, the clear water on top will pass through filters of varying compositions (sand.

Explanation: I hoped that helped.

Explanation:

The Sun is Earth’s major source of energy, yet the planet only receives a small portion of its energy and the Sun is just an ordinary star. Many stars produce much more energy than the Sun

Answer:

The atomic number tells us how many protons and electrons are in the element we are looking at.

Answer:

physical

Explanation:

this is a physical action to create a change. does not involve chemicals or elements

Answer:

[tex]\boxed {\boxed {\sf Physical \ change}}[/tex]

Explanation:

A chemical change, as the name suggests, must result from a change in the chemical makeup and new substances are produced. A very common example is metal rusting.

A physical change can be observed without a change in chemical composition. No new substances are produces. Ripping paper and an ice cube melting are physical changes.

A rubber band stretching is a physical change. No new substances are made and the chemical makeup remains the same.

Answer:

Chemical W is a pure substance

Explanation:

We can conclude that the substance W is a pure substance. Matter on a broad basis can be classified as either pure or distinct substance and impure substances (mixtures).

So, since we can only split the substance into elements X, Y and Z with no simpler units, W is a compound and a pure substance.

Answer:

it is salt

Explanation:

hope it helps