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dalvyx [7]
3 years ago
6

Why is your body going through physical and chemical changes?

Chemistry
1 answer:
Thepotemich [5.8K]3 years ago
6 0

Answer:

Physical and chemical changes can occur almost everywhere, even in our bodies! Food must be broken down into a form that our cells can use. When we eat, our bodies physically break down food into small pieces. Our bodies also chemically break down those small pieces of food into tiny organic molecules.

Explanation:

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A science class is conducting an experiment that produces noxious fumes. Because of inadequate ventilation, some students begin
ZanzabumX [31]
Hjkkligfddguiijvgghuhhjjjugtjjjjhhhhhjjjiin do yeah hjkkkjcsduokn 35899&6& cduooookk
4 0
3 years ago
The bond between carbon and hydrogen is one of the most important types of bonds in chemistry. The length of an H—C bond is appr
nata0808 [166]

Answer:

The dipole moment of H-C bond will be smaller than that of an H-I bond.

Explanation:

The electronegativity of iodine is greater than that of hydrogen.As a result the iodine atom tends to attract the bond electron pair of H-I bond towards itself creating a bond dipole which does not occur in case of H-C bond as the electronegativity of carbon and hydrogen are almost same.

   That"s why dipole moment of H-C bond is smaller than that of H-I bond.

7 0
3 years ago
What groups of elements would not react chemically
True [87]

Answer:

We love the noble gases. Some scientists used to call them the inert gases. It didn't really work because there are a few other gases that are basically inert but not noble gases. Nitrogen (N2) might be considered an inert gas, but it is not a noble gas. The noble gases are another family of elements, and all of them are located in the far right column of the periodic table. For all of you budding chemists, the far right is also known as Group Zero (Group 0) or Group Eighteen (Group XVIII). This family has the happiest elements of all.

Explanation:

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8 0
3 years ago
ASAP Two different atoms have four protons each and the same mass. However, one has a negative charge while the other is neutral
Vinvika [58]

Answer:

Explanation:

Just a little fundamental knowledge:

   Protons are positively charged particles

   Neutrons do not carry any charges

  Both protons and neutrons are located in the nucleus of an atom. They determine the mass of any atom.

 Atoms having the same mass will have the same number of protons and neutrons. Collectively, the number is called mass number.

 Electrons are negatively charged particles orbiting round the nucleus of an atom. They take up the the bulk volume of the atom. They do not add to the weight of an atom.

The protons, neutrons and electrons are the three fundamental particles in an atom.

Two given atoms:

    A = 4 protons and negatively charge

    B = 4 protons and neutral

Location:

  • By default, in all atoms, the protons and neutrons resides in the nucleus.
  • The electrons are located in the orbitals round the nucleus

Possible number of subatomic particles:

For atom A;

     Protons  = 4

     Electrons  = 4

    Neutrons  cannot be determined.

Note: in a neutral atom, the number of protons and electrons are the same

For atom B:

    Protons = 4

    Electrons = 4 + x where x is the number of electrons gained

    Neutrons  cannot be determined.

When an atom becomes charged, it has lost or gained electrons. A negative charge depicts an atom the has gained additional electrons.

The value of x, is always a positive integer greater than 0 and less than 7

   Electrons can be 5, 6, 7, 8, 9 or 10

When the number of electrons reaches 10, the atom is stable.

4 0
3 years ago
A 0.450 g sample of impure CaCO3(s) is dissolved in 50.0 mL of 0.150 M HCl ( aq ) . The equation for the reaction is CaCO3 ( s )
Lapatulllka [165]

Answer:

The mass percentage of CaCO3(s) in the sample is 83.4%

Explanation:

CaCO₃ + 2HCl  →  CaCl₂  +  H2O  +  CO₂

Let's find out the moles of each reactant:

[HCl] = 0.150 mol/L

Molarity . volume = moles

0.150 m/L . 0.050L = 7.5x10⁻³ moles HCl

Molar mass of CaCO₃ =100.08 g

Moles of CaCO₃ = Mass / Molar mass

0.450 g/100.08 g = 4.49x10⁻³ moles of salt

Ratio is 1:2

If 2 moles of HCl react with 1 mol of salt

7.5x10⁻³ moles of HCl react with 7.5x10⁻³ / 2 = 3.75x10⁻³ moles

We must find out the mass

Moles of CaCO₃ . Molar mass CO₃ = 0.3753 g

So now, the mass percentage of salt will be

0.450g ___ 100%

0.3753 g ____ (0.3753 .100 )/0.450 =83.4 %

6 0
3 years ago
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