Questions posted in Chemistry

Explain why elements and compounds are pure substances

Elements and compounds are substances because we know exactly what is in them. Elements are only one kind of atom and have a symbol. Compounds have a formula telling us exactly how many of what kind of atom make up that compound

Solutions, homogeneous mixtures, not only contain 2 compounds, but we do not know how much of each. We can make salt water with one grain of salt in a cup of water or a drop of water in a cup of salt. Mixtures do not have a formula because they can be any concentration.

ANSWERED AT 23/09/2019 - 04:31 AM


QUESTION POSTED AT 23/09/2019 - 04:31 AM

If a 1 kilogram ball is accelerating at 5m/s what force is being applied to it

Water pressure and gas 

ANSWERED AT 23/09/2019 - 04:31 AM


QUESTION POSTED AT 23/09/2019 - 04:31 AM

What is a non example of nucleic acids?

Answer:  Lipids or amino acids.

Explanation:  Nucleic Acids are the long chain of nucleotides which are in return composed of nucleoside and a phosphate group.

Non example of Nucleic Acid implies those substances which does not qualify themselves as Nucleic Acids. Thus the substances which does not contain nucleotides will be the example of non nucleic acids.

There are many substances which come under the example of non nucleic acids. Two of them are amino acids and lipids.

Lipids are the substances like fats, oil etc which does not dissolve in water but they are soluble in alcohol very easily.

Amino Acids are the substances which contain both a carboxylic group and amine group.

ANSWERED AT 23/09/2019 - 04:31 AM


QUESTION POSTED AT 23/09/2019 - 04:31 AM

From the gold foil experiment it was concluded that the atom is mostly empty space True or False

The answer to that would be false

ANSWERED AT 23/09/2019 - 04:28 AM


QUESTION POSTED AT 23/09/2019 - 04:28 AM

You see that a USGS map of your area has a scale of 1:24,00.what does this tell you

This tell me that 1:24,00 is very hevey 

ANSWERED AT 23/09/2019 - 04:28 AM


QUESTION POSTED AT 23/09/2019 - 04:28 AM

Where does energy go during endothermic and exothermic reactions?

It lecterns fries that is the answer.

ANSWERED AT 23/09/2019 - 04:28 AM


QUESTION POSTED AT 23/09/2019 - 04:28 AM

The greek philosopher Democritus was one of the first to suggest the existence of atoms

The idea that all matter is made up of tiny, indivisible particles, or atoms, is believed to have originated with the Greek philosopher Leucippus of Miletus and his student Democritus of Abdera in the 5th century B.C. (The word atom comes from the Greek word atomos, which means “indivisible.”)

ANSWERED AT 23/09/2019 - 04:28 AM


QUESTION POSTED AT 23/09/2019 - 04:28 AM

EXPLAIN: How does the amount of a substance affect the rate at which temperature changes?

The more of a substance you have the longer the reaction will take. If you have a big pot of water and a little pot of water. The little pot will heat up quicker then the bigger pot because it does not need to fill a space up. Think of it as diffusion. When you have a 500 and 50 mL beaker, and you add a blue and red dye to them both. It will only take about a minute for the dye to almost completely mix together in the 50 mL. While the 500 mL it will take much longer for dye to mix all together then it did in the 50 mL. When it is a bigger substance it takes longer for a reaction to fully expose the substance to that reaction. If you have food, if you only have one piece of food you only need to put it in for 30 seconds to 1 minute. While if you have multiple pieces of food you will need longer time to be able to heat all of the pieces. If you have a small bowl of soup and you put it in for a minute the middle will be warm. But if you had a bigger bowl and still put it in for only a minute then the middle will be cold because you did not give it enough reaction time to heat the whole substance.

ANSWERED AT 23/09/2019 - 04:27 AM


QUESTION POSTED AT 23/09/2019 - 04:27 AM

How many energy sublevels are in the second principal energy level?

Answer:

There are two energy sublevels s and p.

Explanation:

The principal energy level is a shell in which the electron is located. There are four principal energy level K, L, M, N. These are further divided in energy sublevel s, p, d, f. In first principal energy level (K) there is only one energy sublevel s. In second principal energy level (L) there are two energy sublevel s and p similarly in third (M) and fourth (N) principal energy level there are three (s, p, and d) and four (s, p, d, and f) energy sublevel respectively.

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

What do you call the shine you observe when looking at metallic objects

That answer would be luster

ANSWERED AT 23/09/2019 - 04:23 AM


QUESTION POSTED AT 23/09/2019 - 04:23 AM

Which of the following is not apart of daltons atomic theory1. Atoms of the same element have the same properties.2. Matter is composed of atoms.3. Atoms change into other atoms in chemi- cal reactions.4. Atoms of different elements have different properties

3. Atoms change into other atoms in chemical reactions.

The idea that you can transform one element into another was called alchemy, and was proven untrue a long time ago. 

ANSWERED AT 23/09/2019 - 04:20 AM


QUESTION POSTED AT 23/09/2019 - 04:20 AM

Light an energy is captured by the green pigment ?

Light and energy is captured by green pigment and chlorophyll molecules.

ANSWERED AT 23/09/2019 - 04:19 AM


QUESTION POSTED AT 23/09/2019 - 04:19 AM

An element with atomic number 10 is located to the .......... of an element with atomic number 9

Pink fluffy unicorns?

ANSWERED AT 23/09/2019 - 04:16 AM


QUESTION POSTED AT 23/09/2019 - 04:16 AM

What is 321 divided by 1000 please show work?!

0.321 is the answer to 321 divided by 1000

ANSWERED AT 23/09/2019 - 04:14 AM


QUESTION POSTED AT 23/09/2019 - 04:14 AM

What is 321 divided by 2818 please show work?!

hope this helped
dont worry i checked my answer to make sure it was a 100% right
















ANSWERED AT 23/09/2019 - 04:13 AM


QUESTION POSTED AT 23/09/2019 - 04:13 AM

What is. 321 divided by 32 show work please!?

Your answer would be 10 with the remainder of 1

(look at work for the work)

ANSWERED AT 23/09/2019 - 04:13 AM


QUESTION POSTED AT 23/09/2019 - 04:13 AM

What would happen if water did not have The Ability to dissolve other substances (36 points for who every can tell me)

Then water and other substances would be stuck in our body and we would not be able to excrete waste out of our body through the large intestine and small intestine.

ANSWERED AT 23/09/2019 - 04:12 AM


QUESTION POSTED AT 23/09/2019 - 04:12 AM

What element is used as a shield to protect people from radioactive substances?

Lead is most commonly used for protecting people from radioactive substances

ANSWERED AT 23/09/2019 - 04:12 AM


QUESTION POSTED AT 23/09/2019 - 04:12 AM

Can anyone help me ?

Answer 1.) Eu3+ ( Europium with charge of + 3 )                                                         Answer 2.) Sn-188 with a -2 charge                                                                               So, we know that 50 protons = the atomic mass= Sn (tin)                                           Now, we have to find the atomic mass/ atomic mass= protons+neutrons/ plugin= 50 protons+ 68 neutrons= 118 amu (atomi mass unit)                                                                                                               Then , we have 48 eletrons ( e-) - ( 50 protons ( positive chage ))=  -2 charge!        Final plugin: Sn-188 with a -2 charge.  

ANSWERED AT 23/09/2019 - 04:09 AM


QUESTION POSTED AT 23/09/2019 - 04:09 AM

What is carbon a solid , liquid or a gas

I would maybe say solid at higher temps

ANSWERED AT 23/09/2019 - 04:08 AM


QUESTION POSTED AT 23/09/2019 - 04:08 AM

The universal force that exists between any objects with mass is called __________. matter weight pull gravity

Answer: Option (d) is the correct answer.

Explanation:

A force that exists between two or more objects which are not in contact is known as gravitational force. It is a downward force.

For example, falling of an apple on the ground is due to the gravitational force.

Thus, we can conclude that the universal force that exists between any objects with mass is called gravity.

ANSWERED AT 23/09/2019 - 04:07 AM


QUESTION POSTED AT 23/09/2019 - 04:07 AM

A 50 kg item is moving at a V of 5m/s...p=?

To calculate momentum of an object you would use the following formula:

P = m • v
P = 50 kg • 5 m/s
P = 250 kgm/s.

ANSWERED AT 23/09/2019 - 04:07 AM


QUESTION POSTED AT 23/09/2019 - 04:07 AM

A rock falls off a cliff and hits the ground after three seconds. What is its velocity right before it hits the ground? 9.8 m/s 0.31 m/s 29.4 m/s 3.3 m/s

To solve this kinematics formula use the following equation:

Vf = Vi + at
Vf = 0 + (9.81 m/s^2)(3 seconds)
Vf = 29.43 m/s and or about 29.4 m/s of reported to 3 significant figures.

ANSWERED AT 23/09/2019 - 04:07 AM


QUESTION POSTED AT 23/09/2019 - 04:07 AM

Which have the most gravitational potential energy?

I believe D because since it is up so high when the lady begins to fall she will have a greater force bringing her back to her original starting point

ANSWERED AT 23/09/2019 - 04:03 AM


QUESTION POSTED AT 23/09/2019 - 04:03 AM

What happens on the side of the earth opposite the moon

Wouldn't the side of the Earth that is opposite to the moon be experiencing day time? I'm not sure what you're asking. It would be exposed to the Sun. 

ANSWERED AT 23/09/2019 - 04:01 AM


QUESTION POSTED AT 23/09/2019 - 04:01 AM