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3 years ago

Put the moon phases in order from first to last phase.

Chemistry

2 answers:

quester [9]3 years ago

5 0

The answer is a i did the test

ivolga24 [154]3 years ago

4 0

It is b or a check with someone else

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What happens when an oceanic plate collides with a continental plate?

Fynjy0 [20]

What happens when an oceanic plate collides with a continental plate?

C. The oceanic plate moves under the continental plate

6 0

3 years ago

Draw and label the parts of a helium atom. Include the mass and charge of each subatomic particle.

mihalych1998 [28]

Explanation:

Helium is the second element on the periodic table.

Information about helium:

it belongs to group O on the periodic table
it is has an atomic number of 2
Helium exists naturally as gas and it is nonreactive.

To write an atom we use this format:

ₙᵇGˣ

G is the symbol of the atom

n is the atomic number

b is the mass number

x is the charge on the atom

Using the periodic table as guide

Symbol of helium is He

Atomic number of helium is 2

mass number of helium is 4

charge on helium atom is 0

⁴₂He

Every atom contains protons, neutrons and electrons;

Electrons are negatively charged. For a neutral atom, the number of electrons is the same as that of protons.

Protons are positively charge particles in an atom. The atomic number is the number of protons in an atom.

neutrons do not have charges.

Helium has:

Number of protons = 2

Number of electrons = 2

Number of neutrons = 2

Mass of each subatomic particle:

1 electron = 9.11 x 10⁻³¹kg

2 electrons = 1.82 x 10⁻³⁰kg

Protons and neutrons have the same mass:

1 proton = 1.67 x 10⁻²⁷kg

2 protons = 3.34 x 10⁻²⁷kg

2 neutrons = 3.34 x 10⁻²⁷kg

Learn more:

helium brainly.com/question/2439349

#learnwithBrainly

4 0

3 years ago

What do you think happens to the bonds between atoms when substances melt?

Eduardwww [97]

Answer:

As a substance melts, and goes from a solid to a liquid state, the kinetic energy of the molecules increases, and the molecules move faster, and they separate further and further away from each other. The intermolecluar forces holding the molecules together become weaker. This is why a liquid can take fill the shape of its container, whereas a solid has a fixed shape.

Explanation:

take your notes man

6 0

2 years ago

What are the four layers of earth made of?

soldi70 [24.7K]

Answer:

crust, mantle, inner core, outer core

8 0

2 years ago

If acetic acid is the only acid that vinegar contains (ka=1.8×10−5), calculate the concentration of acetic acid in the vinegar.

kicyunya [14]

Ethanoic (Acetic) acid is a weak acid and do not dissociate fully. Therefore its equilibrium state has to be considered here.

$CH_{3}COOH \ \textless \ ---\ \textgreater \ H^{+} + CH_{3}COO^{-}$

In this case pH value of the solution is necessary to calculate the concentration but it's not given here so pH = 2.88 (looked it up)

pH = 2.88 ==> $[H^{+}]$ = $10^{-2.88}$ = 0.001 $moldm^{-3}$

The change in Concentration Δ $[CH_{3}COOH]$ = 0.001 $moldm^{-3}$

  CH3COOH H+ CH3COOH
Initial   $moldm^{-3}$      $x$ 0 0

Change $moldm^{-3}$ -0.001 +0.001 +0.001

Equilibrium $moldm^{-3}$ $x$ - 0.001 0.001 0.001


Since the $k_{a}$ value is so small, the assumption
$[CH_{3}COOH]_{initial} = [CH_{3}COOH]_{equilibrium}$ can be made.

$k_{a} = [tex]= 1.8*10^{-5} = \frac{[H^{+}][CH_{3}COO^{-}]}{[CH_{3}COOH]} = \frac{0.001^{2}}{x}$

Solve for x to get the required concentration.

note: 1.)Since you need the answer in 2SF don&t round up values in the middle of the calculation like I've done here.

2.) The ICE (Initial, Change, Equilibrium) table may come in handy if you are new to problems of this kind

Hope this helps!

8 0

3 years ago