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Serhud [2]
4 years ago
14

Total solar eclipses are common and happen every month at the beginning of the new lunar cycle.

Chemistry
1 answer:
Bogdan [553]4 years ago
7 0
False, solar eclipses happen when the moon moves between the Sun and the Earth, blocking the Sun's rays and casting a shadow on Earth. It happens about once every 18 months (on average)
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Steve is performing a titration, where a base is at an unknown concentration. What should he choose as his indicator solution?St
lidiya [134]

Answer:

D

Explanation:

4 0
3 years ago
Which example best describes a double displacement reaction?
Inessa05 [86]

Answer:

The first one would describe it best

Explanation:

The second option sounds like a single displacement reaction

The third is a decomposition reaction

ANd the first is a combination reaction

6 0
4 years ago
Read 2 more answers
Hydrogen has 3 isotopes 1 H 2 H and 3 H. What is the difference between these 3 isotopes
Anarel [89]

Answer:

See below.

Explanation:

1 H (hydrogen) has  a nucleus of just 1 proton.

2 H (deuterium)  has a nucleus of 1 proton and 1 neutron

3 H (tritium) has a nucleus of 1 proton and 2 neutrons.

5 0
3 years ago
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How many moles are present in 54.8 mL of mercury if the density of mercury is 13.6 g/mL?​
lesya692 [45]

Answer:

3.72 mol Hg

General Formulas and Concepts:

<u>Chemistry - Atomic Structure</u>

  • Reading a Periodic Table
  • Using Dimensional Analysis
  • Density = Mass over Volume

Explanation:

<u>Step 1: Define</u>

D = 13.6 g/mL

54.8 mL Hg

<u>Step 2: Identify Conversions</u>

Molar Mass of Hg - 200.59 g/mol

<u>Step 3: Find</u>

13.6 g/mL = x g / 54.8 mL

x = 745.28 g Hg

<u>Step 4: Convert</u>

<u />745.28 \ g \ Hg(\frac{1 \ mol \ Hg}{200.59 \ g \ Hg} ) = 3.71544 mol Hg

<u>Step 5: Check</u>

<em>We are given 3 sig figs. Follow sig fig rules and round.</em>

3.71544 mol Hg ≈ 3.72 mol Hg

8 0
3 years ago
Identify the type of reactions based on the reactants. Then, predict the products for the following reactions. Make sure to bala
ASHA 777 [7]

Answer:

a) C3H8 + 502 ----> 3CO2 + 4H20.

combustion reaction

b) HBr + KOH ----> KBr + H2O

Neutralization reaction

c)AlBr3 + 3 KCl----> 3 KBr + AlCl3

Redox reaction

8 0
3 years ago
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