CHEMISTRY HIGH SCHOOL

The physicals properties of a substance can be used to identify the substance, because_____. Select all that apply.at any given location, the physical properties of a substance do not change
when the substances are chemically reacted the physical properties remain the same
each substance has a unique set of physical properties
no two substances have any of the same properties

Answers

Answer 1

Answer: The answer is C because having a unique set of features sets the substance apart from another substance.

Answer 2

Answer:

The following statements apply:

1. At any given location, the physical properties of a substance do not change.

2. Each substance has a unique set of physical properties.

Each substance usually has some characteristics that are peculiar to it and these characteristics can be used to identify them and separate them from other materials. Change of location does not affect the properties of substances, thus, the properties of oxygen that is found in America is the same as the one that is found in Nigeria.

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What is the charge on an electrically neutral atom of hydrogen?. . A. 1. . B. 0. . C. +1. . D. +2.

Answers

When the number of electron and number of protons are equal in the atom then the atom is said to be an electrically neutral atom. The loss of electron will result in the formation of cation and the atom will possess positive charge which is equal to the number of electrons lost whereas the gain of electron will result in the formation of anion and the atom will possess negative charge which is equal to the number of electrons gained.

The electrically neutral atom have 0 charge as the number of protons and electrons are equal.

For electrically neutral atom of hydrogen, $H$ the number of electron =1 and the number of proton = 1.

Hence, the charge on an electrically neutral atom of hydrogen is 0.

Its B zero because its neutral meaning that there balance

What 2 pieces of equipment will you use to separate the salt from the water?

Answers

Separate Salt and Water Using Distillation

If you want to collect the water, you can use distillation. This works because salt has a much higher boiling point than water. One way to separate salt and water at home is to boil the salt water in a pot with a lid.

hope this helps!!

Final answer:

To separate salt from water, you can use evaporation or filtration.

Explanation:

To separate the salt from the water, you can use the processes of evaporation and filtration.

Evaporation: You can heat the saltwater solution to boil off the water and leave behind the salt as solid crystals. The water evaporates and can be collected as a vapor if desired.
Filtration: Alternatively, you can use a filter to separate the solid salt particles from the liquid water. The saltwater solution is poured through the filter, which traps the salt while allowing the water to pass through.

Learn more about salt separation here:

brainly.com/question/12827858

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How many moles of oxygen are formed when 58.6 g of KNO3 decomposes according to the following reaction? The molar mass of KNO3 is 101.11 g/mol.4 KNO3(s) → 2 K2O(s) + 2 N2(g) + 5 O2(g)

Answers

First, convert the amount of KNO3 to moles using the molar mass:
58.6 g / 101.11 g/mol = 0.5796 mol KNO3

Next, using the given balanced reaction, use the stoichoimetric ratio to calculate the number of mole of oxygen that will be produced. From the reaction, for every 4 moles of KNO3 that decomposes, there are 5 moles of O2 formed. So,
0.5796 mol KNO3 x (5/4) = 0.7254 moles O2

Therefore, when 58.6 g of KNO3 decomposes, there are 0.7254 moles of O2 that will be formed.

The moles of oxygen formed when 58.6 g of KNO3 decomposes is $\boxed{{\text{0}}{\text{.7245moles}}}$

Further Explanation:

Stoichiometry of a reaction is used to determine the amount of species present in the reaction by the relationship between the reactants and products. It can be used to determine the moles of a chemical species when the moles of other chemical species present in the reaction is given.

Consider the general reaction,

${\text{A}}+2{\text{B}}\to3{\text{C}}$

Here,

A and B are reactants.

C is the product.

One mole of A reacts with two moles of B to produce three moles of C. The stoichiometric ratio between A and B is 1:2, the stoichiometric ratio between A and C is 1:3 and the stoichiometric ratio between B and C is 2:3.

The given reaction is,

${\text{4KN}}{{\text{O}}_3}\left(s\right)\to2{{\text{K}}_2}{\text{O}}\left(s\right)+2{{\text{N}}_2}\left(g\right)+5{{\text{O}}_2}\left(g\right)$

 On reactant side,

Number of potassium atoms is 4.

Number of nitrogen atom is 4.

Number of oxygen atoms is 12.

 On the product side,

Number of potassium atoms is 4.

Number of nitrogen atom is 4.

Number of oxygen atoms is 12.

The number of atoms of all the species in both the reactant and the product side is the same. So above reaction is balanced. The stoichiometry of the balanced reaction indicates that 4 moles of ${\text{KN}}{{\text{O}}_3}$ decompose to give 2 moles of ${{\text{K}}_2}{\text{O}}$ to form 2 moles of ${{\text{N}}_2}$ and 5 moles of ${{\text{O}}_2}$ .

The formula to calculate the number of moles of ${\mathbf{KN}}{{\mathbf{O}}_{\mathbf{3}}}$ is as follows:

${\text{Moles of KN}}{{\text{O}}_3}=\frac{{{\text{Given mass of KN}}{{\text{O}}_3}}}{{{\text{Molar mass of KN}}{{\text{O}}_3}}}$ …… (1)

The given mass of is 58.6 g.

The molar mass of is 101.11 g/mol.

Substitute these values in equation (1)

$\begin{gathered}{\text{Moles of KN}}{{\text{O}}_3}{\mathbf{=}}\left({58.6\;{\text{g}}}\right)\left({\frac{{{\text{1}}\;{\text{mol}}}}{{{\text{101}}{\text{.11}}\;{\text{g}}}}}\right)\n=0.5796\;{\text{mol}}\n\end{gathered}$

According to the stoichiometry, 4 moles of ${\text{KN}}{{\text{O}}_3}$ decompose to give 2 moles of ${{\text{K}}_2}{\text{O}}$ , 2 moles of {{\text{N}}_2} and 5 moles of ${{\text{O}}_2}$ .

So the number of moles of {{\mathbf{O}}_{\mathbf{2}}} formed by 0.5796 moles of ${\mathbf{KN}}{{\mathbf{O}}_{\mathbf{3}}}$ is calculated as follows:

$\begin{gathered}{\text{Moles of }}{{\text{O}}_2}{\mathbf{=}}\left({\frac{{5\;{\text{mol}}}}{{4\;{\text{mol}}}}}\right)*\left({0.5796\;{\text{mol}}}\right)\n=0.7245\;{\text{mol}}\n\end{gathered}$

Hence, the moles of ${{\mathbf{O}}_{\mathbf{2}}}$ produced is 0.7245 moles.

Learn more:

1. Bond energy of H-H bond in the given reaction: brainly.com/question/7213980

2. What coefficients are required to balance equation: brainly.com/question/1971314

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Mole concept

Keywords: stoichiometry, KNO3, K2O, O2, N2, moles, A, B, C, molar mass, reactants, products, 0.5796 moles, 0.7245 moles, potassium, oxygen and nitrogen.

Which compound is insoluble in water?(1) calcium bromide (3) silver bromide
(2) potassium bromide (4) sodium bromide

Answers

I think the correct answer from the choices listed above is option 3. It is the compound Silver bromide that is insoluble to water. It has a very low solubility which is approximately 0.14 milligram per liter of water. Hope this answers the question. Have a nice day.

A chemical equation is shown below.CH4 + Cl2 → CCl4 + HCl

What are the coefficients that should be added to balance this equation? Use complete sentences to explain your answer.

Explain how this chemical reaction demonstrates the conservation of mass.

Answers

Answer:

Start by balancing the carbon atoms:

There is one carbon atom on each side of the equation, so carbon is already balanced.

Next, balance the hydrogen atoms:

There are four hydrogen atoms on the left (in CH4), so we need four HCl molecules on the right to balance the hydrogen atoms. The equation now becomes:

CH4 + Cl2 → CCl4 + 4HCl

Now, balance the chlorine atoms:

There are two chlorine atoms on the right (in CCl4), so we need two Cl2 molecules on the left to balance the chlorine atoms. The equation now becomes:

CH4 +

Explanation:

Even though the number of atoms on the left side (reactants) is 7 and on the right side (products) is 9, the law of conservation of matter is still upheld. This is because we need to consider the coefficients (the numbers in front of each compound) to account for the total mass. When you balance the equation and adjust the coefficients, you'll find that the total number of atoms remains the same on both sides, satisfying the law of conservation of matter.

The amount of silica in the magma and temperature are factors that determine the viscosity of magma.

Answers

The viscosity of magma increases as the silica content increases from basalt to rhyolite.

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