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maks197457 [2]
3 years ago
10

Which of these is a balanced chemical equation?

Chemistry
2 answers:
Makovka662 [10]3 years ago
3 0

Answer:

The first one: 2Ca + O^2 → 2CaO

sleet_krkn [62]3 years ago
3 0

Answer:

first option -> 2Ca + O^2 → 2CaO

Explanation:

hope this helps

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The elements in the periodic table are arranged in order of
Alenkinab [10]

Answer:

dsgadsagsdgsd

Explanation:

5 0
3 years ago
The table lists properties of a few known elements, but the states of matter and melting points are missing. Look up the element
kolbaska11 [484]

The properties of the given elements are as follows:

Potassium, K;

  • State of matter: Solid
  • Melting point: 63.5 °C
  • Conductivity: Good
  • Solubility (H2O): reacts rapidly with water

Iodine, I;

  • State of matter: solid
  • Melting point: 113.5 °C
  • Conductivity: very poor
  • Solubility (H2O): negligible

Gold, Au;

  • State of matter: solid
  • Melting point: 1064 °C
  • Conductivity: excellent
  • Solubility (H2O): none

Germanium, Ge;

  • State of matter: solid
  • Melting point: 938.2 °C
  • Conductivity: fair
  • Solubility (H2O): none

Barium, Ba;

  • State of matter: solid
  • Melting point: 727 °C
  • Conductivity: good
  • Solubility (H2O): reacts strongly

Argon, Ar;

  • State of matter: gas
  • Melting point: -189.4 °C
  • Conductivity: none
  • Solubility (H2O): negligible

Chlorine Cl;

  • State of matter: gas
  • Melting point: -101.5 °C
  • Conductivity: poor
  • Solubility (H2O): slight

Rubidium, Rb;

  • State of matter: solid
  • Melting point: 39.48 °C
  • Conductivity: good
  • Solubility (H2O): reacts violently

Silver, Ag;

  • State of matter: solid
  • Melting point: 961.8 °C
  • Conductivity: excellent
  • Solubility (H2O): none

Calcium, Ca;

  • State of matter: solid
  • Melting point: 842 °C
  • Conductivity: good
  • Solubility (H2O): reacts

Silicon, Si;

  • State of matter: solid
  • Melting point: 1,410 °C
  • Conductivity: intermediate
  • Solubility (H2O): none

Xenon, Xe;

  • State of matter: gas
  • Melting point: -111.8 °C
  • Conductivity: very poor
  • Solubility (H2O): none

<h3>What are elements?</h3>

Elements are pure substances which are composed of similar atoms.

Elements are defined as substances which cannot be split into simpler substances by an ordinary chemical process.

Elements have different physical and chemical properties and can be classified into:

  • metals
  • semi-metals
  • non-metals

In conclusion, the physical and chemical properties of the elements vary from metals to non-metals.

Learn more about elements at: brainly.com/question/6258301

#SPJ1

7 0
1 year ago
To calculate the enthalpy change for the reaction, 2CO (g) + O2 (g) Imported Asset 2 CO2 (g), you can use ΔHf0 values for each r
svetoff [14.1K]

Answer:

ΔH0reaction = [ΔHf0 CO2(g)] - [ΔHf0 CO(g) + ΔHf0 O2(g)]

Explanation:

Chemical equation:

CO + O₂   →  CO₂

Balanced chemical equation:

2CO + O₂   →  2CO₂

The standard enthalpy for the formation of CO = -110.5 kj/mol

The standard enthalpy for the formation of O₂  = 0  kj/mol

The standard enthalpy for the formation of CO₂  = -393.5 kj/mol

Now we will put the values in equation:

ΔH0reaction = [ΔHf0 CO2(g)] - [ΔHf0 CO(g) + ΔHf0 O2(g)]

ΔH0reaction = [-393.5 kj/mol] - [-110.5 kj/mol + 0]

ΔH0reaction = [-393.5 kj/mol] - [-110.5 kj/mol]

ΔH0reaction = -283 kj/mol

7 0
3 years ago
If a mixture looks smooth and the same throughout it is probably what
gulaghasi [49]
Answer:
             <span>If a mixture looks smooth and the same throughout it is probably <u>Homogeneous</u>.

Explanation:
                   Mixture is the combination of different compounds which are unreactive to each other.

Mixture are classified as ...

Solutions; in which the mixed compounds are thoroughly mixed and cannot be distinguished from each other and are said to be homogeneous. In solutions the size of solute is very small (i.e. Less than 1 nm).

Colloids; in which the solute is homogeneous visually but heterogeneous microscopically. The size of particles in this case is between 1 nm to 1 </span>μm.

Suspensions; in which the mixture is heterogeneous, the particle size is greater than 1 μm and settles down (precipitation) under the influence of gravity.
4 0
3 years ago
Can I please Get Help with this question ‍♂️ ?
Nitella [24]

Answer:

Mg(NO4)2 is 180.3 g/mol

Explanation:

First find the substance formula.

Magnesium Nitrate.

Magnesium is a +2 charge.

Nitrate is a -1 charge.

So to balance the chemical formula,

We need 1 magnesium atom for every nitrate atom.

2(1) + 1(-2) = 0

So the substance formula is Mg(NO4)2.

Now find the molar mass of Mg(NO4)2.

Mg = 24.3 amu

N = 14.0 amu

O = 16.0 amu

They are three nitrogen and twelve oxygen atoms.

So you do this: 24.3 + 14.0(2) + 16.0(8) = 180.3 g/mol

So the molar is mass is 180.3 g/mol.

The final answer is Mg(NO4)2 is 180.3 g/mol

Hope it helped!

7 0
3 years ago
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