All categories

2 years ago

Describe the difference between physical and chemical changes in terms of what happens to the matter

1 answer:

6 0

A physical change means that the matter will remain the same, let's say you take a piece of paper and tear it in half, it's still paper. The difference with chemical changes is, the matter changes state; now let's say you take that piece of paper and light it on fire, it's state changes to ash.

You might be interested in

When heated to 700–800 °c, diamonds, which are pure carbon, are oxidized by atmospheric oxygen. (they burn!) write the balanced

Varvara68 [4.7K]

Hello!

The balanced chemical equation for the oxidation of diamonds is the following one:

C(s) + O₂(g) → CO₂(g)

As simple as that! You see, Diamonds are an allotropic form of pure carbon. Allotropic forms are different arrangements of atoms. In graphite, the C atoms are arranged in layers like paper sheets, and in diamond, the C atoms are arranged in a tetrahedral structure, which gives them their hardness and their thermal and electrical properties. Burning diamonds would be the same as burning elemental carbon and the chemical equation is the one shown before.

Have a nice day!

7 0

3 years ago

In Chef’s famous Beef Wellington, you have to get the pastry just right. According to the recipe, Chef uses 400g of butter. But

lisabon 2012 [21]

Amount of butter Chef used = 400g

1 g = 0.035274 oz

Therefore, 400 g = 0.035274 x 400 oz = 14.1096 oz

A) Chef Jacqueline should use __14.1096______ oz of butter.

1 g = 0.00220462 pound

Therefore, 400 g = 0.00220462 x 400 pound = 0.881848 pound

B) Chef Amy should use _0.881848________ pounds of butter.

5 0

2 years ago

Which of the following is a nonpolar molecule?

mylen [45]

Answer: The correct option is A) a nitrogen molecule.

Explanation:

Polar covalent molecules are defined as chemical compounds in which the difference in electronegativity between the atoms is not equal to 0. These molecules are formed by heteronuclear molecules.

Heteronuclear molecules are defined as the molecules which are formed by the combination of more than one type of atom having a different nucleus.

Non-polar covalent molecules are defined as chemical compounds in which the difference in electronegativity between the atoms is equal to 0. These molecules are formed by homonuclear molecules.

Homonuclear molecules are defined as the molecules which are formed by the combination of one type of atom having the same nucleus.

From the given options:

A) A nitrogen molecule

It is a homonuclear molecule formed by the combination of 2 nitrogen atoms

B) A nitrogen monoxide molecule

It is a heteronuclear molecule formed by the combination of 1 nitrogen and 1 oxygen atoms

C) A linear nitrogen oxide molecule $(N_2O)$ with nitrogen in the center

It is a heteronuclear molecule formed by the combination of 2 nitrogen and 1 oxygen atom and has some dipole moment. Thus, is considered a polar molecule

D) A bent nitrogen dioxide molecule $(NO_2)$ with nitrogen in the center

It is a heteronuclear molecule formed by the combination of 1 nitrogen and 2 oxygen atoms and has some dipole moment. Thus, is considered a polar molecule

Hence, the correct option is A) a nitrogen molecule.

6 0

2 years ago

How many protons neutrons and electrons does nitrogen 14 have?

vazorg [7]

Many nitrogen atoms have seven neutrons (14-7 = 7). Some atoms of nitrogen, however, have eight electrons. They are atoms of N-15, an isotope of nitrogen. In a neutral atom, the number of protons must equal the number of electrons.

5 0

2 years ago

John Dalton and Antoine Lavoisier were alchemists who tried to convert diamonds to gold.

larisa86 [58]

This is false. They were both chemists and they made many discoveries such as realizing that charcoal and diamond are different forms of the same element and proposing an atomic theory, but they never tried to turn diamonds to gold.

8 0

3 years ago

Read 2 more answers