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3 years ago

Define a physical change

Chemistry

2 answers:

Arte-miy333 [17]3 years ago

6 0

Answer: A physical change is a change that can be undone.

Explanation: An example of this is mixing red blocks, green blocks, and blue blocks. You can easily separate them.

arlik [135]3 years ago

6 0

Answer and Explanation:

Physical Change is when a form of matter changes in a physical way, not in a chemical. For example, the size of the matter will change but in a chemical way.

They can also be reversed.

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You are given a cube of lead that is 1.000 cm on each side. The density of lead is 11.35. How many atoms of lead are in the samp

aliya0001 [1]

11.35 g atoms of lead are in the sample.

What does density mean?

The density of an area refers to the quantity of things—which may include people, animals, plants, or objects—there are in it.
Divide the number of objects by the area's measurement to determine density.
A country's population density is calculated by dividing its total population by its area, expressed in square kilometers or miles.

We can calculate the volume of the cube by cubing the side of the cube.

Volume of cube = ( 1.000 cm)³

= 1.000 cm³

We can now determine the amount of lead in the cube by multiplying by the density. Because we know we have a 1.000 cubic centimeter and that lead has a density of 11.35 grams per cubic centimeter, we have 11.35 grams of lead.

= ( 1.000 cm³) ( 11.35 $\frac{g}{cm^{3} }$ )

= 11.35 g

Learn more about density

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3 0

1 year ago

Determine the empirical formula of an oxide of silicon from the following: mass of crucible= 18.20g, mass of crucible +silicon =

lyudmila [28]

The required empirical formula of the silicon oxide is SiO2.

4 0

3 years ago

Who arranged the elements according to atomic mass and used the arrangement to predict the properties of missing element?

Marina CMI [18]

Answer:

Dmitri Mendeleev

Explanation:

Dmitri Mendeleev a Russian Chemist arranged elements on the periodic table according to their atomic mass. He used this arrangement to predict some of the properties of the missing element.

Dmitri Mendeleev around 1869 described the periodic table.
The table was based on the periodic law which states that "chemical properties of elements are a periodic function of their atomic weights".
In the Mendeleev table, elements are arranged by atomic weights with recurring properties in a periodic manner.

3 0

3 years ago

How does the shape of a molecule affect its function?

sesenic [268]

B. the shape of a molecule determines its properties and interactions

7 0

2 years ago

Although not usually soluble in plain water, an amphoteric oxide or hydroxide is: 1. soluble in neutral solutions. 2. soluble in

Aleksandr [31]

Answer:

The correct option is: 4. soluble in both acidic and basic solutions

Explanation:

Oxide is a chemical compound formed by an element with oxygen. In such compounds, the oxygen is generally present in the -2 oxidation state.

Whereas, hydroxide is a chemical compound formed by an element with hydroxyl group (-OH).

Oxides and hydroxides of some elements are amphoteric in nature. Such compounds can behave as an acid in basic medium and behave as a base in acidic medium.

Therefore, amphoteric oxides and hydroxides are soluble in both acidic and basic solutions.

5 0

3 years ago