CHEMISTRY MIDDLE SCHOOL

What are constellations

Answers

Answer 1
Answer: Stars that form shapes, or are connected together.
Answer 2
Answer: Constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.

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MIDDLE SCHOOL

What is the complete ionic equation for NaOHaq plus HCIaq equals H2OI plus NaCIaq?

Answers

Answer:

Ionic equation:

Na⁺(aq) + OH⁻(aq) + H⁺(aq) + Cl⁻(aq)   →  H₂O(l) + Na⁺(aq) + Cl⁻ (aq)

Explanation:

Chemical equation:

NaOH(aq) + HCl(aq)   →  H₂O(l) + NaCl (aq)

Balanced chemical equation:

NaOH(aq) + HCl(aq)   →  H₂O(l) + NaCl (aq)

Ionic equation:

Na⁺(aq) + OH⁻(aq) + H⁺(aq) + Cl⁻(aq)   →  H₂O(l) + Na⁺(aq) + Cl⁻ (aq)

Net ionic equation:

OH⁻(aq) + H⁺(aq)    →  H₂O(l)

The  Cl⁻(aq)  and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

MIDDLE SCHOOL

Given the reaction below: 2Cu + 8HNO3 --> 3Cu(NO3)2 +2NO + 4H2O

The mole ratio of NO produced to HNO3 reacted is


A. 4:1

B. 1:4

C. 2:3

D. 2:3

Answers

The given equation is  is

3Cu(NO_{3})_{2}+2NO+4H_{2}O" alt="2Cu+8HNO_{3}-->3Cu(NO_{3})_{2}+2NO+4H_{2}O" align="absmiddle" class="latex-formula">

this is not balanced

The balanced equation will be:

3Cu(NO_{3})_{2}+2NO+4H_{2}O" alt="3Cu+8HNO_{3}-->3Cu(NO_{3})_{2}+2NO+4H_{2}O" align="absmiddle" class="latex-formula">

Now as per it if we are using eight moles of HNO3 we are getting two moles of NO

so for each mole of NO we have to take four moles of HNO3

Hence the mole ratio of NO produced to HNO3 reacted will be = 1:4

HIGH SCHOOL

When snow melts does its volume decrease or increase?

Answers

The volume of the snow decreases. This had happened because the snow is made up or comprised of water (H2O) and oxygen (O). When the snow starts melting, the air inside the snow discharges into the atmosphere and the water turn out to be a puddle on the ground. 

HIGH SCHOOL

Which of the following is not equal to 42.7 millimeters? A. 0.0000427 km
B. 0.000427 hm
C. 0.00427 m
D. 4.27 cm

Answers

The answer is: C. 0.00427 m.

A) 1 km = 1000000 mm.

d = 0.0000427 km · 1000000 mm/km.

d = 47.7 mm.

B) 1 hm = 100000 mm.

d = 0.000427 hm · 100000 mm/hm.

d = 42.7 mm.

C) 1 m = 1000 mm.

d = 0.00427 m · 1000 mm/m.

d = 4.27 mm.

D) 1 cm = 10 mm.

d = 4.27 cm · 10 mm/cm.

d = 42.7 mm.

Millimeter (abbreviated: mm, a thousandth part of metar) is an unit of distance in the metric system.

MIDDLE SCHOOL

What does it mean that gold has a specific heat capacity of 0.135 J/g*C

Answers

A specific heat capacity of 0.135 J·°C⁻¹g⁻¹ means that it takes 0.135 J of energy to change the temperature of 1 g of gold by 1 °C.

HIGH SCHOOL

what happens to a gas that is enclosed in a rigid container when the tempature of the gas is increased

Answers

The gaseous molecules begin to move rapidly and pressure in the container builds.
MIDDLE SCHOOL

A positively charged substance is brought near the ion. What will most likely happen and why

Answers

Answer: It repels positive ion and attracts negative ion.

Explanation:

There are 2 types of ions:

1. Cations: These ions are positively charged ions which are formed when a substance looses electrons.

2. Anions: These ions are negatively charged ions which are formed when a substance gains electrons.

It is known that, like charges repel each other and unlike charges attract each other.

As, it is given that the substance is positively charged, so it will attract anion and repel cation.

MIDDLE SCHOOL

What type of acid is sulfuric acid

Answers

Answer : Sulfuric acid is a strong acid.

Explanation :

Acids are of 2 types

1) Strong acid : This is the type of acid that completely dissociates forming H⁺ and an anion.

A strong acid has a very large Ka value.

2) Weak acid : Weak acid have a tendency to dissociate partially. They do not release all the H⁺ ions. Only a fraction of the molecules can release the H⁺

Weak acids have small Ka values.

The chemical formula of sulfuric acid is H₂SO₄. It dissociates as follows.

Ka value for H₂SO₄ is approximately 1 x 10³.

Therefore we can say that H₂SO₄ is a strong acid.

Sulfuric also spelled sulphuric (H2SO4),
 its an oxyacid
HIGH SCHOOL

What happens when the kinetic energy of molecules increases so much that electrons are released by the atoms, creating a swirling gas of positive ions and negative electrons?

Answers

The answer is d in this case


Answer:

it's C

Explanation:

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