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gulaghasi [49]
3 years ago
9

I need help with 2, 3, and 4 please help i will give the brainliest

Chemistry
1 answer:
Sphinxa [80]3 years ago
8 0

Answer:

2=2.28*10^5

3=3.98*10^3

4=5.76*10^3

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An example of a scientific law is the law of conservation of mass, which states that matter is neither created nor destroyed in
Amanda [17]

Answer:A) It was developed from past observations- true

It is subject to experimentation and revision.- false

It explains why mass is conserved- false

It predicts future observations-true

Explanation:

Before a hypothesis is proclaimed to be a law in science, numerous observation must have confirmed its validity and rigorous experimentation under carefully controlled conditions usually precedes the acceptance of a hypothesis as a law. The law of conservation of mass was developed from numerous past observation that proved its validity.

4 0
3 years ago
The atomic notation for a particular atom of boron is 11/5 B. The atomic number is while the mass number is_, while the mass num
Morgarella [4.7K]

The atomic number=5

The mass number=11

<h3>Further explanation</h3>

In the following element notation,

\tt \large {{{A} \atop {Z}} \right X}

 X = symbol of elemental atom

A = mass number

   = number of protons + number of neutrons

Z = atomic number

   = number of protons = number of electrons, on neutral elements

So for The atomic notation for a particular atom of Boron  :

₅B¹¹

Z=5=atomic number

A=11=mass number

5 0
3 years ago
Glucose is the monomer in the natural polymers ____________________ and cellulose.
Olin [163]

Answer:

Starch

I hope this helps

5 0
3 years ago
H. Identity of unknown metal
OLEGan [10]

Answer:

you can identify an unknown substance by measuring its density and comparing your results to a list of known densities. Density=mass/volume. Assume that you have to identify an unknown metal. You can determine the mass of the metal on a scale.

8 0
4 years ago
Give the correct balanced equation for the single replacement reaction of magnesium with aluminum oxide.
Leni [432]
<h3><u>Answer;</u></h3>

C. 3Mg + Al2O3 → 3MgO + 2Al

<h3><u>Explanation;</u></h3>
  • <u><em>Single replacement reaction is a type of reaction which one reactant reacts with another and makes a product by replacing one element by another. </em></u>
  • Mg (Magnesium) reacts with Al₂O₃ (Aluminium oxide) and produces MgO (Magnesium oxide) and Al (Aluminium) as products. Here Al is replaced by Mg. Reaction is 

            Mg + Al₂O₃ → MgO + Al

  • To balance the reaction equation, both left and right hand sides should have same number of atoms in each element.

The balanced equation will  be;

3Mg + Al2O3 → 3MgO + 2Al

5 0
3 years ago
Read 2 more answers
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