What are compounds?A. Pure Substances

B. Heterogeneous Mixture

C. Homogeneous Mixture

Answers

Answer 1

Answer: I think the correct answer is option A. Pure substances can be considered as compounds. Compounds are molecules made of atoms from different elements held together by chemical bonds. Pure substances are these compounds that exist alone no other substance.

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Can someone how to do these problems!!

Answers

You can use the follwing equations.
pH=14-pOH
pOH=-log[OH⁻]

a) pOH=-log10⁻¹²
pOH=12
pH=14-12
pH=2

You can also use these equations:
[H⁺]=K(w)/[OH⁻] (K(w)=1.01×10⁻¹⁴)
pH=-log[H⁺]

b) [H⁺]=(1.01×10⁻¹⁴)/10⁻²M
[H⁺]=1.01×10⁻¹²M²
pH=-log(1.01×10⁻¹²)
pH=12

You can use either method. It does not really matter.
I hope this helps. Let me know if anything is unclear and when you do the calculations for c you should get pH=7.

What is the [h3o ] in a buffer that consists of 0.30 m hcooh and 0.20 m hcoona? ka = 1.7 × 10-4 i just need the steps to do it, not the answer ?

Answers

The concentration of H₃O⁺ in a buffer system formed by 0.30 M HCOOH and 0.20 M HCOONa is 2.5 × 10⁻⁴ M.

We have a buffer system formed by 0.30 M HCOOH and 0.20 M HCOONa.

We can calculate the pH of the buffer using Henderson-Hasselbach's equation.

$pH = pKa + log ([HCOONa])/([HCOOH]) \n\npH = -log (1.7 * 10^(-4) )+ log (0.20)/(0.30) = 3.6$

Given the pH is 3.6, we can calculate the concentration of H₃O⁺ using the following expression.

$pH = -log [H_3O^(+) ]\n[H_3O^(+) ] = antilog-pH = antilog -3.6 = 2.5 * 10^(-4) M$

The concentration of H₃O⁺ in a buffer system formed by 0.30 M HCOOH and 0.20 M HCOONa is 2.5 × 10⁻⁴ M.

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Which description is NOT a characteristic of the nucleus of an atom? a. always contains the same amount of protons and neutrons b. contains uncharged particles c. positively charged d. accounts for most of the atom's mass

Answers

The answer would be A

How does a balanced chemical equation show that mass is never lost or gained in a chemical reaction

Answers

mass never changes in anything and after the solution you will notice answer has 1 same number

Final answer:

A balanced chemical equation shows that mass is not lost or gained in a chemical reaction by ensuring the number of atoms and overall charge on both the reactants and products side are equal, adhering to the law of conservation of mass.

Explanation:

A balanced chemical equation is one where the number of each type of atom in the reactants side is equivalent to the number of the same type of atoms in the products side. In chemical reactions, matter cannot be created or destroyed, a principle called the law of conservation of mass. This means that all the atoms present in the reactants will be accounted for in the products, ensuring that mass is never lost or gained during the reaction process.

For instance, if we take the simple chemical reaction of hydrogen and oxygen forming water (2H2 + O2 → 2H2O), you'll see that there are four hydrogen atoms and two oxygen atoms both before and after the reaction, thus demonstrating mass conservation. Additionally, in balanced chemical equations, not only should atoms be balanced, but also charges to ensure charge conservation which is necessary when dealing with ionic substances. The mass balance and charge balance are both instrumental in maintaining the law of conservation of mass in chemical reactions.

Learn more about balanced chemical equations here:

brainly.com/question/28294176

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Please tell me the answer to the following question and if you can please explain it, if you will I'll vote your answer the brainliest and you'll receive more points. Thank you!Which of the following pairs of elements is least likely to form an ionic compound?
1.) Calcium and Bromine
2.) Sodium and Fluorine
3.) Lithium and Chlorine
4.) Magnesium and Argon

Answers

First you need to know how ionic compounds are created!

Ionic compounds are formed by IONS (Obviously, what am I, a dummy?)
There are two types of ions: anions and cations.
Anions can only be formed by nonmetals, and cations can only be formed by metals.
In order for ions to bond, there must be one anion and one cation, because opposite charges attract.

Let's look at your choices.

1) Ca + Br can form ionic bonds
2) Na + F can form ionic bonds
3) Li + Cl can form ionic bonds

However...

4) Mg + Ar

This is a special case. Ar is a NOBLE GAS, which means that it has the maximum number of valence electrons (8) in its outermost shell. Therefore, ANY type of bonding is IMPOSSIBLE.

Your answer should be 4) Mg + Ar

A chemist measures 340 grams of sodium acetate. To convert this measurement to kilograms, the chemist should multiply 340 by _.a) 1 kg / 1 g
b) 1000 g / 1 kg
c) 1000 kg / 1000 g
d) 1 kg / 1000 g

Answers

Answer:

option d = 1 kg/ 1000 g

Explanation:

Given data:

Mass of sodium acetate = 340 g

Mass of sodium acetate in Kg = ?

Solution:

Gram and kilogram both are units of mass. Kilogram is larger unit while gram is smaller unit. The one kilogram equals to the 1000g. In order to convert the given value into kilogram the value must be multiply with 1 Kg/ 1000g.

340 g × 1 Kg/ 1000g

0.34 Kg

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