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2 years ago

A. On the Periodic Table of Elements, columns are called ______________________; all of these

2 answers:

7 0

1. Groups
2. They have the same number of electrons in their outer shell
3. Periods
4. They have the same number of shells

Vesnalui [34]2 years ago

4 0

Answer:

A. On the peridic table of elemets, columns are called groups; all of these elements have the same number of electrons in the outer orbital.

B. On the periodic table of elements, rows are called periods; all of these have the same number of atomic orbitals.

I think this is right sorry if i'm wrong!

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Why are atomic masses on the Periodic Table written in decimals when they are based on mass numbers that can be whole numbers?

Dmitry_Shevchenko [17]

To allow for equations and problems in chemistry to be as precise as possible. When experiments are conducted, and even if the number is the slightest bit off, the problem or experiment could be impacted very negatively. It allows for complete accuracy to ensure nothing goes wrong, since chemistry is very touchy and risky when dealing with extremely unsafe elements.

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2 years ago

Iron iii chloride ammonium hydroxide balanced equation, complete ionic equation, net ionic equation

Vladimir [108]

Iron III Chloride has a chemical formula of FeCl₃, while ammonium hydroxide has a chemical formula of NH₄OH.

The balanced equation would be:

FeCl₃ (aq) + 3 NH₄OH (aq) → Fe(OH)₃ (s) + 3 NH₄Cl (aq)
The precipitate is Fe(OH)₃ or iron iii hydroxide.

To find the complete ionic equation, dissociate the compounds in aqueous phases into their ionic forms:

Fe³⁺ + Cl⁻ + NH₄⁺ + 3 OH⁻ --> Fe(OH)₃(s) + NH₄⁺ + Cl⁻

To find the net ionic equation, cancel out like ions that appear both in the reactant and product side:

Fe³⁺ + 3 OH⁻ --> Fe(OH)₃

4 0

2 years ago

An atom with the same number of protons and electrons has charge of

xz_007 [3.2K]

Answer:

Explanation:

All the charges of the protons are cancelled out by all the charges on the electrons.

6 0

2 years ago

What do punnet squares do

larisa86 [58]

Answer:

The Punnett square is a square diagram that is used to predict the genotypes of a particular cross or breeding experiment. ... The diagram is used by biologists to determine the probability of an offspring having a particular genotype.

Explanation:

in biology it predicts the possible offspring provided the features of the mother or father

6 0

2 years ago

Does anyone know the answers for these

Alexeev081 [22]

Answer: 1. 0.045moles

2. 2.10 grams

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

1. $\text{Number of moles of zinc nitrate}=\frac{8.51g}{189.36g/mol}=0.045moles$

2. Mass of $C_2H_4=moles\times {\text {Molar mass}}=0.075moles\times 28.05g/mol=2.10g$

4 0

2 years ago