Im literally failing some classes can some one help me with them

Answer:

1

Explanation:

there is only one sulphur (S) atoms in the formula for sodium sulphate

The chemical formula for sodium sulfate is Na₂SO₄.One sulfur atoms are in the formula for sodium sulfate.

The term chemical formula shows the elements that create  the compound and the numbers of atoms of each element in the smallest unit of that compound, be it a molecule or a formula unit.

Chemical formulas are classified into three types: empirical, molecular, and structural.

Empirical formulas depict the simplest whole-number ratio of atoms in a compound, whereas molecular formulas depict the number of each type of atom in a molecule and structural formulas depict how the atoms in a molecule are bonded to each other.

Thus, the chemical formula for sodium sulfate is Na₂SO₄. In sodium sulphate two molecules of sodium, one atom of sulfur, and four atoms of oxygen are present.

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Answer:

c.to increase the validity of data

Answer:

i think its D

Explanation:

pls tell me if im wrong

Answer:

b

Explanation:

plz mark brailest

Answer:

noble gases are very high because they have the maxium amount of electrons in their outer shell

Explanation:

Answer:

electrons/electron density

Explanation:

The branch of science that deals with electrons are called chemistry. An element consists of electrons, protons, and neutrons.

The correct answer to the question is electrons density.

In the cloud model,  the electrons are revolving around the nucleus. In an atom when the electron's density is very high which represents a cloud.

Hence, the correct answer is electrons.

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Answer:

the number of protons

Explanation:

that's it

Explanation:

a cl chlorine

b NH3 ammonia

c co2 carbon dioxide

d H hydrogen

e o oxygen

Answer:

12 ml

Explanation:

the answer will be calculated by subtracting 37 ml from 25 ml so ,

37 - 25

= 12 ml

Answer:

balance

Explanation:

because you just add together but they just switch the 2 and 3

Answer:

False

Explanation:

The Universe's birth is only a theory. The theory has changed over the years, but currently the most believed theory is the Big Bang Theory. Also, there is always more to discover

Answer:

173.2 C

Explanation:

have a good day

21 kJ of heat are required to melt 40 g of sodium chloride at its melting point.

The standard enthalpy of fusion of NaCl is 0.52 kJ/g, that is, it takes 0.52 kJ of heat to melt 1 g of NaCl at its melting point. The heat required to melt 40 g of NaCl is:

[tex]40 g \times \frac{0.52kJ}{g} = 21 kJ[/tex]

21 kJ of heat are required to melt 40 g of sodium chloride at its melting point.

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Answer:

The correct option is;

b. It contains at least two colored substances

Explanation:

In chromatography, a mixture is separated into its components, such that in the filter paper, on which the drops of ethanol are then placed on the ink mark, we have different phases of the components of the mixture that have different levels of mobility by capillary action through the filter paper.   Therefore, given that two concentric rings of circles are obtained, we have that each ring is composed of a different component of the mixture and there are therefore, at least two colored substances.

Answer:

In case of low-mass stars,the outer layers of the low mass stars are expelled  as the core collapses such that the outer layers form a planetary nebula.

Explanation:

In case of low-mass stars,the outer layers of the low mass stars are expelled  as the core collapses such that the outer layers form a planetary nebula. The core remains as a white dwarf and finally become a black dwarf as it cools down. A low mass star consumes its core hydrogen and turns it into helium over its lifetime.

Answer:

Nitrogen

Explanation:

:) pls mark brainliest

Answer:

Nitrogen

Explanation:

To find your answer, pay attention to the number of protons. Protons define an element's atomic number.

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 136 g

volume = 12 cm³

We have

[tex]density = \frac{136}{12} = \frac{34}{3} \\ = 11.333333...[/tex]

We have the final answer as

Hope this helps you

Answer:

Hey mate.....

Explanation:

This is ur answer.....

---> Equal

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Answer:

I am not quite sure if this is what you are looking for but each side of the equation should be equivalent.

Answer:

a

Explanation:

Answer:

Explained below

Explanation:

In chemistry, the process of a chemical change is when the atoms from the reactants rearrange themselves and bond together differently to form one or more new substances with different characteristics than the reactants. Now, after this new substance is formed, the change is called a chemical change.

Now, in cooking Food will undergo a chemical change as it is being cooked. For example, when we boil brown meat, we are causing reactions that change the chemical composition in ways that enhance flavors. Proteins and fibers such as beans when cooked are broken down or undergo denaturation thereby making digestion easier when eaten. Fats like cooking oils are melted while Eggs when boiled are coagulated.

1 mole contains 6.023 *10^23 molecules

Given parameters:

Mass of H₃PO₄  = 49g

Unknown:

Number of moles  = ?

Solution:

To find the number of moles of a given specie;

   number of moles = [tex]\frac{mass}{molar mass}[/tex]

Molar mass = 3(1) + 31 + 4(16) = 98g/mol

Input the parameters and solve;

       Number of moles  = [tex]\frac{49}{98}[/tex]  = 0.5mole

The number of moles is 0.5mole

Answer:

B. Products

Explanation:

trust me its right

Answer:A

Explanation: because it represents a salt which is a nonmetal

Answer:

A. cutting a substance into four pieces

Explanation:

The others include burning, reacting, and rust which make up a chemical change.

Cutting a substance into four pieces indicates a physical change. The correct option is A.

Even before to and after a physical change, the material implicated is unique architectural the same.

Physical changes include texture, shape, heat, and the beginning of a change in the state of matter. The texture of a substance influences how it feels.

A physical change is simply a change in appearance. The situation has not changed since the change.

Physical change can be seen in the use of cutting paper, melting butter, dissolving salt in water, and breaking glass.

Chemical reaction takes place when bonds among molecules or atoms are broken or formed.

This implies that one material with a specific set of properties is transformed into another substance with a different set of properties.

Thus, the correct option is A.

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Answer:

B)

Explanation:

Answer:

1) Gaining

2) More

3) More

4) increases

5) decreases

Explanation:

Nonmetals are found towards the right hand side of the periodic table. They form ions by gaining electrons due to the fact that they have more electrons in their outermost shell, hence they only need a few electrons to complete the octet structure.

As the number of shells increases, the outermost shell becomes more populated and easier to fill with electrons.

The reactivity of nonmetal elements generally increases from left to right across the periodic table but decreases from top to bottom down the group.

Answer:

1) Gaining

2) More

3) fewer

4) increases

5) decreases

Explanation:

Answer:

noon is the answer. Hope it helps

Answer:

Noon

Explanation:

Hope this helps <3