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Mademuasel [1]
2 years ago
14

How can one show that elements that have different appearances have similar chemical properties?​

Chemistry
1 answer:
ad-work [718]2 years ago
4 0

Answer:

Elements within the same group have the same number of electrons in their valence (outermost) shells, and they have similar electron configurations. They exhibit similar chemical properties.

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How many moles of CH4 are in 148.6 g? Round your answer to two decimal places.
Dafna1 [17]

Answer:

9.29 mol

Explanation:

Given data:

Number of moles = ?

Mass = 148.6 g

Solution:

Number of moles = mass/ molar mass

Molar mass of CH₄ = 16 g/mol

Now we will put the values in formula.

Number of moles = 148.6 g/ 16 g/mol

Number of moles = 9.29 mol

Thus 148.6 g have 9.29 moles.

6 0
2 years ago
Can Molecules be made up of more than one type of atom
slega [8]

Answer:

yes

Explanation:

molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance

3 0
2 years ago
Investigators studying a particular cell response are curious about what type of cell-surface receptor might trigger it. They in
belka [17]

Answer:

An ion channel, more specifically a calcium channel.

Explanation:

The electrical activity of the cells is regulated by ion channels. Calcium channels, also referred as the voltage-gated calcium channels constitute one group of a superfamily of ion channels. A change in voltage across the membrane or small molecules triggers calcium channels to open, allowing calcium to flow into the cell. Inside the cell, calcium acts as a second messenger, it binds to calcium sensitive proteins to induce different responses and support several functions such as muscle contraction, hormone and neurotransmitter secretion, gene regulation, activation of other ion channels, control of action potentials, cell survival, etc.

3 0
2 years ago
Determine whether the following statements describe chemical or physical properties: (a) Oxygen gas supports combustion. (b) Fer
sdas [7]

Explanation:

A change that does not cause any change in chemical composition of a substance is known as a physical change.

For example, mass, density, volume etc are all physical changes.

On the other hand, a change that brings change in chemical composition of a substance is known as chemical change.

For example, combustion, toxicity, reactivity etc are all chemical changes.

Hence, following statements are identified as chemical or physical changes as follows.

(a) Oxygen gas supports combustion : Chemical change

(b) Fertilizers help to increase agricultural production : Chemical change

(c) Water boils below 100^{o}C on top of a mountain : Physical change

(d) Lead is denser than aluminum : Physical change

(e) Uranium is a radioactive element : Chemical change

7 0
3 years ago
A group of electrons is treated as a point charge of -1.12 x 10-18 C. How many electrons make up this point charge? Remember tha
Pepsi [2]

Answer:

7

Explanation:

Given that the total charge is given by;

C =nq

Where;

n = number of charges

q = quantity of charge

Where the total amount of charge is  -1.12 x 10-18 C and the magnitude of each charge is  -1.602 x 10-19 C

Then the number of electrons is obtained from;

n =  -1.12 x 10-18 C/ -1.602 x 10-19 C

n = 7

4 0
2 years ago
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