CHEMISTRY HIGH SCHOOL

Which element has chemical properties that are most similar to the chemical properties of sodium?(1) beryllium (3) lithium
(2) calcium (4) magnesium

Answers

Answer 1
Answer: Check out your periodic table. Elements in the same column (families) usually share similar properties because they have the same number of valence electrons. In this case, the only element listed that is part of Sodium's family is Lithium, so Lithium is most similar to Sodium.
Answer 2
Answer:

Final answer:

Lithium is an element that has chemical properties most similar to sodium.

Explanation:

Out of the given options, lithium is the element that has chemical properties most similar to sodium.

Sodium and lithium are both in Group 1 of the periodic table, also known as the alkali metals. Alkali metals have similar properties because they all have one valence electron, which makes them highly reactive.

For example, like sodium, lithium reacts vigorously with water to produce hydrogen gas and a hydroxide:

2Li(s) + 2H2O(l) → 2LiOH(aq) + H2(g)

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The compound C3H6 can react with bromine. Write an equation for this reaction and name the product formed. State the visible change which accompanies the reaction.

Answers

Answer:

C3H6 + Br2 = C3H6Br2

The product formed is 1,2-dibromopropane.

The red-brown color of the bromine disappears, leaving a colorless liquid

Explanation:

C3H6 + Br2 = C3H6Br2

The product formed is 1,2-dibromopropane.

This is a direct addition reaction.  The one molecule of bromine (Br2) joins the organic compound C3H6 to form one molecule of C3H6Br2.

This seemed unlikely at first, but one must look more closely at the C3H6.  This is not a straight alkane (e.g., propane).  Propane has the formula C3H8:

  H3-C-C2-CH3

The molecule C3H6 is propylene (or propene).  It has a double bond between two carbons.

H3-CH-CH=CH2

The compound in the question is propylene.  When exposed to bromine, the carbon double bond breaks and a bromine atom is attached to each carbon:

   H3-CH-CH=CH2 + Br2 = H3-CH-CHBr-CHBr

When propene reacts with bromine, the red-brown color of the bromine is lost and the product is a colorless liquid.

How many atoms are present in 3.500 mol of NH3? NEED ANSWER ASAP

Answers

I’m pretty sure it’s c I’m so sorry if you get it wrong

Calculate the energy in joules and calories required to heat 25.0 g of water from 12.5C to 25.7C

Answers

the heat (Q) required to raise the temp of a substance is:Q=m∗Cp∗ΔT where m is the mass of the object (25.0g in this case), Cp is the specific heat capacity of the substance (for water Cp = 1.00cal/gC, or 4.18J/gC,
and Dt is the change in temp.
You'll have to solve this twice, once with the Cp in calories, and once with the Cp in joules.
1380.72 Joules

At any given location, the physical properties of a substance do not change. a. True
b. False

Answers

It is true that at any given location, the physical properties of a substance do not change. 

Which particle makes the atom an unstable isotope?

Answers

The particle that makes the atom an unstable isotope is either excess proton or excess neutron.

What is Unstable isotopes?

Unstable isotopes are isotopes of an element that have an excess of either protons or neutrons in their atomic nucleus, making them prone to undergo radioactive decay.

Radioactive decay is the process by which an unstable atomic nucleus releases energy in the form of radiation to achieve a more stable configuration.

The specific particles that can make an atom an unstable isotope are:

Protons: If an atom has an excessive number of protons in its nucleus, it can become unstable.

Neutrons: Similarly, if an atom has an excessive number of neutrons in its nucleus, it can become unstable.

Thus, the particle that makes the atom an unstable isotope is either excess proton or excess neutron.

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Instability of an atoms nucleus can result from an excess of either neutrons or protons . So neutrons and protons .

What is the molar mass of a substance

Answers

Molar mass of a molecule is the sum of the atomic mass of the individual elements in the molecule.  

Atomic mass of Pb = 207  amu

Atomic mass of N = 14  amu

Atomic mass of O = 16  amu

Here amu stands for atomic mass unit

Molar mass of Pb(NO₃)₂ = 207 + [14 + (16 x 3)] x 2  

                                         = 207 + 28 + (48) x 2 = 331 g/mol  
The mass of an element in the periodic table
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