CHEMISTRY MIDDLE SCHOOL

How do scientist learn about the mantle and core of the earth

Answers

Answer 1
Answer: They drill too deep and find lava

Related Questions

MIDDLE SCHOOL

What does "like dissolves like" mean

Answers

Dissolve means a mixture of chemicals combine.
Example: salt and water you put salt in water stir and the salt dissolve
HIGH SCHOOL

Explain why metric prefixes are used ,what is the common denominator between them??

Answers

Metric prefixes are used because their abbreviation can be easily translated to the amount of quantity with respect to or in relation to the base metric unit for a particular measurement.

I believe the common denominator between them is 10.
HIGH SCHOOL

Which Group 15 element exists as diatomic molecules at STP? (1) phosphorus (3) bismuth
(2) nitrogen (4) arsenic

Answers

Answer: The correct option is 2.

Explanation: Group 15 elements are Nitrogen, phosphorous, Arsenic, Antimony, Bismuth.

To know whether an element exits as a diatomic molecule or not, we look at the atomicity of an element.

Atomicity is the number of atoms of an element combining to form a molecule.

Atomicity of Nitrogen = 2

Atomicity of Phosphorous = 4

Atomicity of Bismuth = 1

Atomicity of Arsenic = 1

The element having atomicity 2 will exist as a diatomic molecule.

Hence, Nitrogen is a diatomic molecule

Nitrogen exists as diatomic molecules at STP. 
COLLEGE

A nitrogen-containing compound shows no absorption band at ∼3400cm−1 and no absorption bands between ∼1700cm−1 and ∼1600cm−1. what class of compound is it

Answers

By the given information the nitrogen containing compound belongs to the class of tertiary amine. Absorption band is a range of energies and frequencies in the electromagnetic spectrum. Amine is nothing but a ammonia compound that involves an organic element as a replacement for one or more H atoms.
HIGH SCHOOL

In the mineral beryl what is the ratio of beryllium to aluminum to silicate.? 1. 1:1:1 2. 1:2:3 3. 1:36 4. 1:2:6

Answers

I can't find the c orrect ratio in the selection. The formula for beryl is Be3Al2(SiO3)6 so it should be 3:2:6.

Answer:

correct answer is 1:2:6

Explanation:

MIDDLE SCHOOL

If you have a density of 3g/meander a mass of 15g what is the volume?

Answers

M=D*V,
V=m/D
m=15 g
D=3 g/ml
V=15 g/3 g/ml=5 ml


HIGH SCHOOL

Please help quick!!! 30 points :D 1.)Energy that comes from the internal motion of atoms and molecules is called

chemical energy

electrical energy

thermal energy

potential energy


2.)In any energy conversion, some of the energy is lost to the environment as

electrical energy

potential energy

sound energy

thermal energy

3.)Based on the principles of convection, conduction and thermal radiation, which scenario(s) below is/are most similar to heating a tin can of water using a Bunsen?

The sun warming up the roof on a house.
Cold water sinking in a pot of water being warmed up on the stove
Warm air rising in a room where the air is moving
Feeling a metal wire get warmer as you roast a marshmallow over a fire.

2 only.

2 and 3 only.

All of these choices.

2, 3, and 4 only.

Answers

Answer 1:

Energy that comes from the internal motion of atoms and molecules is called chemical energy

Explanation:

When atoms inside an object vibrate or they move then give up their energy. This energy is given as the chemical energy. Chemical energy is energy stored in the bonds of atoms and molecules. When these atoms or molecules move they are said to be ions as well and when their bonds break they are dissociated in their respective ions.  


Answer 2:

In any energy conversion, some of the energy is lost to the environment as thermal energy

Explanation:

Thermal energy is the energy produced from heat. For example the burning of fossil fuels in the environment produces heat ot thermal energy as well. Similarly the burning of gasoline inside automobiles engines also produce heat energy. So we can say that In any energy conversion, some of the energy is lost to the environment as  heat or thermal energy.

Answer 3:

The correct options are

  • Cold water sinking in a pot of water being warmed up on the stove
  • Feeling a metal wire get warmer as you roast a marshmallow over a fire.
Explanation:

The scenario given above is the phenomenon of convection which is defined as the process in which heat i transferred from one object to another object by direct contact of those two objects. So if we see the question we are given with convection process hence a metal wire get warmer as we roast a marshmallow over a fire. Or cold water sinking in a pot of water being warmed up on the stove.


1)Chemical Energy


2) Potential Energy


3) 2 and 3 only

MIDDLE SCHOOL

what is a mole and why does a mole of magnesium and a mole of carbon weigh different they have the same number of atoms?

Answers

~ A mole is a unit of 6*10^23.

~One mole of carbon atoms has a mass of exactly 12 g.

~ Because magnesium atoms each have twice the mass of carbon atoms ( 24Mg compared with 12C), one mole of magnesium has a mass of 24 g.

~ Rather, one mole of any element has a mass in grams that is equal to its relative atomic mass.
HIGH SCHOOL

What is the concentration of sodium phosphate contains 0.60 M Na+? I'm not sure what to do and how to figure how to do this question.

Answers

Sodium phosphate has a chemical formula
Na2PO4
Calculating the concentration of sodium phosphate given a concentration of sodium ions can be done using dimensional analysis
0.60 moles/L Na+ (1 mole Na2PO4 / 2 moles Na+) = 0.30 moles/L Na2PO4
= .030 M Na2PO4
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