Are these two picures Chemical, Physical, or both Chemical and Physical changes?

Answer:

They design building structures mostly .-.

Explanation:

Answer:

c) A molecule having a Covalent bond may be polar or non polar

Answer: Thx for the free points brother!

Explanation: Thx!

Answer:

12 g of C.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

O2 + C —> CO2

Finally, we shall determine the mass of O2 and C that reacted. This can be obtained as follow:

Molar mass of O2 = 16 × 2 = 32 g/mol

Mass of O2 from the balanced equation = 1 × 32 = 32 g

Molar mass of C = 12 g/mol

Mass of C from the balanced equation = 1 × 12 = 12 g

Thus, from the balanced equation above, 32 g of O2 reacted with 12 g of C.

Explanation:

Sodium and Lithium both belongs to same group (Group 1).

Group 1 element have 1 valence electron. That's why Group 1 element contains Na• , Li• one electron on it's atom.

Note -

It's not a dot . It's an electron.

The three general categories into which the elements are divided are metals, nonmetals, or metalloids.

Elements are the chemical elements of the periodic table. There are 118 elements in the periodic table. The periodic table displays all the elements according to their atomic numbers.

They are categorized into three terms. They are metals, which are malleable, soft, and luster. Metals are crystalline solid and naturally present in nature. Non-metals are those elements that are hard and brittle and not very reactive.

Metalloids are those elements that have the quality of both metals and non-metals, and they can act like both with time. They are also called semimetals.

Thus, the three general categories are metals, nonmetals, and metalloids.

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Answer:

0.025M

Explanation:

Molarity (M) = number of moles (n) ÷ volume (v)

To find the mole of CaF2, we need to find its molar mass:

Ca= 40g/mol, F=19g/mol

CaF2 = 40 + 19 (2)

40 + 38

= 78g/mol.

Using; mole = mass/molar mass

mole = 7.85/78

mole = 0.1006

mole = 0.101mol

Molarity (M) = number of moles (n) ÷ volume (v)

Volume in Litres = 4025mL/1000

= 4.025L

Molarity (M) = 0.101/4.025

Molarity = 0.025M

Answer:

Explanation:

Low electronegativity and low ionization energy

Answer:

A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.

Answer:

"The number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge. The atomic number tells you the number of protons in one atom of an element. It also tells you the number of electrons in a neutral atom of that element."

Explanation:

-irion-isd.org:)

Hope  this helps:) Can I Pleasse have brainliest?!

The number of protons in an element's atom is represented by the element's atomic number. The atomic number identifies the element because the number of protons establishes the identity of the element.

The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei.

The number of protons in an atom is the atomic number. It is sometimes referred to as the proton number for this reason. The capital letter Z is used to represent it in calculations.

The word zahl, which translates to "number of numerals" in German, or "atomzahl," a more recent word that means "atomic number," are the origins of the letter Z.

Thus, the number of protons in an element's atom is represented by the element's atomic number. The atomic number identifies the element because the number of protons establishes the identity of the element.

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Answer:

[Kr] 4d1 5s2

Hope this helped :)

Answer:

A camp fire lights up a cave

Answer:

B lunar eclipse

Explanation:

Answer:

Lunar Eclipse

Explanation:

I have a science book that shows.

Answer:

Pasteur-Disproved spontaneous generation using S-necked flasks that were open to the air but did not let microorganisms in. Broth boiled in the flasks did not become contaminated. ... The organisms could have come from the air and settled into the broth.

Explanation:

Answer:

False

Explanation:

hope it helps

An object that is made of one or smaller units would make the best model of a group of cells from a plant is a sponge. The correct option is B.

All living things, from microbes to people, rely on cells for structure and function. Scientists regard them as the tiniest form of life. Cells contain the biological machinery that produces the proteins, chemicals, and signals that are responsible for everything that occurs within our bodies.

The cellular level is the most fundamental level of organization. A cell is the fundamental unit of life and the smallest reproducible unit. While the form and function of cells vary widely depending on the organism, all cells share a few characteristics.

Cells combine to form tissues, and tissues combine to make organs. Organ systems, such as the skeletal and muscular systems, are made up of organs.

Therefore, the correct option is B. sponge.

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Answer:

I'm not sure if this is what your looking for but, the ordered pair would be 2,4

Explanation:

the line intercepts the y axis at point 2 and same on the x axis the line intercepts at 4

The graph below represents a function. The value of f(4)​ is -4

Function is defined as a phrase, rule, or law defining a relationship between one variable and another.

Functions are common in mathematics and are required for the formulation of physical relationships in the sciences.

There are various types of functions.

The value of f can be calculated by using formula

fx = 4 - x2

f(4) = 4 - 4 x 2

f(4) = 4 - 8

f(4) = -4

Thus, the graph below represents a function. The value of f(4)​ is -4

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Answer:

atomic mass

Explanation:

the avergae mass of all the isotopes of an element is called the atomic mass. the atomic mass is the mass of an atom.

Answer:

B. Volume Your welcome

Answer:

its sodium carbonate

Explanation:

Answer:

Explanation:

you just said it Na2CO3

Answer:

Potential

Explanation:

Answer:20

Explanation:not true jus doing it for points

Answer:

the atomic number of magnesium is 12 the atoms that cause reactions are 2 the rest are the research on them later today

Answer:What must happen for an electron to move to a higher energy level? ... → The electron must transfer some energy to the nucleus. → The electron must absorb light energy.

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Thank you and have an amazing day

Answer:

(A)

Explanation:

ice is crystalline and rigid

Its molecular formula is C6H12O6. Since each of the subscripts is divisible by 6, the empirical formula for glucose is CH2O.

It´s just the way it is. Have a good day!

Its chemical structure is C[tex]_6[/tex]H[tex]_{12}[/tex]O[tex]_6[/tex]. The empirical formula that glucose is CH[tex]_2[/tex]O since every one of the subscripts being divided by 6.

The definition of an empirical formula for a compound is one that displays the ratio of the components present in the complex but not the precise number of atoms in the molecule. Subscripts are used next to the component symbols to indicate the ratios.

If you are aware of the compound's molar mass, you may apply the equation to determine its molecular composition. Dividing the compound molar mass either by empirical formula mass after calculating the organic compound with the formula mass to get this. Its chemical structure is C[tex]_6[/tex]H[tex]_{12}[/tex]O[tex]_6[/tex]. The empirical formula that glucose is CH[tex]_2[/tex]O since every one of the subscripts being divided by 6.

Therefore, the empirical formula that glucose is CH[tex]_2[/tex]O since every one of the subscripts being divided by 6.

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Answer:

Veure explicació per a més detalls

Explanation:

Si mirem els dos àtoms, descobrirem que són àtoms de clor. A l'ésser àtoms de clor, tenen el mateix nombre atòmic (17). Aquesta és la semblança entre els dos àtoms.

Tots dos tenen diferent nombre de neutrons. El Cl-37 té 20 neutrons, mentre que el Cl-35 té 18 neutrons. Tots dos exhibiran les mateixes propietats químiques però propietats físiques i velocitats de reacció lleugerament diferents.