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3 years ago

6.2 QUIZ

Chemistry

1 answer:

ioda3 years ago

8 0

Answer:

The answer to your question is below

Explanation:

1.- It is a metal attach to an oxygen, then the name would be name of the metal + oxide.

Zinc oxide

2.- It is a metal attach to a non metal, then the name would be name of the metal + name of the non metal ending in "ide".

Manganese phosphide

3.- it is also a metal attach to a non metal, then the name would be name of the metal + name of the non metal with ending "ide".

Calcium phosphide

4.- K₂S

5.- PbBr₄

6.- Ba₃N₂

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A person walks at 2 km/h for four hours. What is their displacement?

Masteriza [31]

Answer:

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3 years ago

Express the result of the following calculation in scientific notation: 0.0263 cm2÷ 88.2 cm

VikaD [51]

<u>Answer:</u> The result of the given calculation is $2.98\times 10^{-4}cm$

<u>Explanation:</u>

Scientific notation is defined as the notation in which a number is expressed in the decimal form. This means that the number is always written in the power of 10 form.

We are given an expression:

$\Rightarrow \frac{0.0263cm^2}{88.2cm}$

The operation carried out in the above expression is division operation. The units are also treated in the same way.

The solution for the above expression is:

$\Rightarrow \frac{0.0263cm^2}{88.2cm}=0.000298cm$

The value in scientific notation is $2.98\times 10^{-4}cm$

Hence, the result of the given calculation is $2.98\times 10^{-4}cm$

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4 years ago

Which substance has a mass is 13.5 grams, and its volume is 5 cm 3.

solmaris [256]

Answer:

Substance is Aluminium

Explanation:

We are given;

Mass; m = 13.5 grams

Volume; V = 5 cm³

Formula for density is;

density = m/V

Density = 13.5/5

Density = 2.7 g/cm³

From the table attached, we can see that the element with a corresponding density of 2.7 is Aluminium

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3 years ago

When magnesium hydroxide reacts with nitric acid, it produces magnesium nitrate and water

shtirl [24]

It can be shown that matter is neither created nor destroyed in a chemical reaction by taking a critical look at the each atom in both sides of the reaction (reactant and product sides).

1 atom of Mg started the reaction and 1 atom is also present in the products.

8 atoms of O are present in the reactants and 8 is also present in the products.

4 H atoms are present in the reactants and 4 are also present in the products.

2 N atoms are present in the reactants and 2 are also in the products.

In other words, the total number of each atom that is present in the reactants are also present in the product. Nothing has been lost during the reaction, although, the forms of each atom might have changed.

More on the law of conservation of matter can be found here: brainly.com/question/20635180

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3 years ago