A student does not observe a change when holding a test tube in a flame. However, a change is expected. What is the most likely reason for this?

Answers

Answer 1

Heat is energy, and that energy would eventually cause the object to undergo a phase change.

Answer 2

D. The reactants were not heated long enough.

Related Questions

Covalent compounds:
a)are formed from one metal and one nonmetal
b) exchange electrons in a chemical bond
c) have a low melting point
d)have weaker bonds than ionic compounds

Which answer would be correct i think maybe B

Answers

The Answer is D:

d) covalent bonds have weaker bonds than ionic compounds

The correct option is c i.e, have a low melting point. Covalent compounds have a low melting point due to weaker intermolecular forces. They are formed from two or more nonmetal elements and share electrons in a chemical bond.

Understanding the properties of covalent compounds is essential in Chemistry. Let's analyze each option provided:

Option A: Covalent compounds are not formed from one metal and one nonmetal. Instead, they are formed from two or more nonmetal elements.Option B: This option is incorrect because, in covalent bonds, atoms share electrons rather than exchange them.Option C: Covalent compounds indeed have a low melting point compared to ionic compounds. This is due to the weaker intermolecular forces present in covalent compounds.Option D: Correct. Covalent bonds generally have weaker bonds than ionic compounds, making it easier to melt or boil covalent compounds.

Given the above explanations, the correct answer is Option C: Covalent compounds have a low melting point.

A burning match is an example of a chemical change phase change nuclear change physical change

Answers

A burning match would be an example of a chemical change: two or more reactants are altered into new substances. In the case of a burning match, sulfur, wood, and oxygen are combining to made smoke and ash.

A burning match is an example of a chemical change. The transformation of two or more reactants into new compounds.

The term "chemical change" describes a process when one or more compounds are changed into new substances with new chemical properties. The atoms of the original substances rearrange themselves to establish new chemical bonds during a chemical transition, producing new molecules or compounds.

An illustration of a chemical change, in which two or more reactants are changed into new compounds, would be a burning match. Sulphur, wood, and oxygen combine to create smoke and ash when a match is lit.

To know more about chemical change, here:

https://brainly.com/question/23693316

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What is the molar mass of (NH4)2SO4

Answers

Element. Symbol. Atomic artom. atoms
Hydrogen. H 1.00794 8
Nitrogen N 14.0067 2
Oxygen O 15.9994 4
Sulfur S 32.065 1

Molecular weight calculation:
(14.0067 + 1.00794*4)*2 + 32.065 + 15.9994*4

Molar mass of (NH4)2SO4 =
132.13952 g/mol

which of the following is not something that the atmosphere does for us ?

a. the atmosphere gives us air to breath

b. the atmosphere provides us protection

c. the atmosphere gives us gravity

d. the atmosphere provides us with weather

Answers

D because we do not depend on the atmosphere for our weather.

The gas in a cylinder has a volume of 8 liters at a pressure of 101 kPa. The pressure of the gas is increased to 213 kPa. Assuming the temperature remains constant, what would the new volume be?

Please show your work, thanks!

Answers

We'll use the Ideal Gas Law.

Before:
[tex]p_1V_1=n_1RT_1\\\\ (101\times10^{3})\cdot8=n_1RT_1\\\\ n_1RT_1=808\times10^3~~~(i)[/tex]

After:
[tex]p_2V_2=n_2RT_2\\\\ (213\times10^3)\cdot V_2=n_2RT_2~~~(ii)[/tex]

Since the quantity of gas wasn't changed, [tex]n_1=n_2=n[/tex]. Furthermore, the temperature remains constant, so [tex]T_1=T_2=T[/tex]. Then, the expressions that were find are:

[tex]nRT=808\times10^3~~~(i)\\\\ nRT=(213\times10^3)\cdot V_2~~~(ii)[/tex]

Dividing them:

[tex]\dfrac{nRT}{nRT}=\dfrac{808\times10^3}{(213\times10^3)\cdot V_2}\\\\ 1=\dfrac{808}{213\cdot V_2}\\\\ 213V_2=808\\\\ V_2=\dfrac{808}{213}\\\\ \boxed{V_2\approx 3.79~L}[/tex]

Hello!

Data:

Vo (initial volume) = 8 L
V (final volume) = ?
Po (initial pressure) = 101 kPa
P (final pressure) = 213 kPa

We have an isothermal transformation, that is, its temperature remains constant, if the volume of the gas in the container decreases, so its pressure increases. Applying the data to the formula, we have:

[tex]P_0*V_0 = P*V[/tex]

[tex]101*8 = 213*V[/tex]

[tex]808 = 213V[/tex]

[tex]213V = 808[/tex]

[tex]V = \dfrac{808}{213} [/tex]

[tex]\boxed{\boxed{V \approx 3,79\:L}}\end{array}}\qquad\checkmark[/tex]

I Hope this helps, greetings ... DexteR!

don't answer if you're not 100%.

A compound differs from a mixture in that the compound

has two or more identities

has only one identity

is composed of only one kind of atom

can be separated by physical means.

Answers

Answer: has only one identity

Compounds like water (H2O) has 2 kinds of atoms which are hydrogen and oxygen. They also have a chemical bond and their bond is not able to be separated by physical means. It different with a mixture of water with sugar. The water and sugar are two different molecules but they don't bind each other. If you evaporate the water, the sugar will remains so it can be separated by physical means..

When an atom that has no charge loses two electrons, it becomes a:
A: positive ion.
B: negative ion.
C: positive isotope.
D: negative isotope.

Answers

Answer: Option (a) is correct.

Explanation:

It is known that electrons hold a negative charge. So, when the negative charge that is electrons are taken out an atom then the number of electrons become less in number as compared to the number of protons.

Hence, the atom attains a positive charge.

An isotope is formed when an atom shows same number of protons and different number of neutrons. So, when an atom loses 2 electrons there will be no change in the number of neutrons. Therefore, an isotope will not form.

Thus, it is concluded that when an atom with no charge loses two electrons, it becomes a positive ion.

Answer:

positive ion

Explanation:

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