CHEMISTRY MIDDLE SCHOOL

How would the speed be different if its orbit were a circle instead of am ellipse

Answers

Answer 1
Answer: Planets in orbit actually undergo difference speeds due the ellipse shape. The closer they are to the body they're orbiting the faster they go. If they were going in a simple circle, the speed would be constant.

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HIGH SCHOOL

Which macromolecules are polymers made of nucleotides

Answers

Nucleic Acids are polymers made of nucleotideds 

I believe that nucleic acids are made out of nucleotides

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HIGH SCHOOL

100g of water at 90 degree celsius is added to 50g of water at 10 celsius, what is the final temperature

Answers

The answer is 80 degree celcius
HIGH SCHOOL

Classify these substances. 1. N2:______.
a. solution
b. heterogeneous mixture
c. homogeneous mixture
d. element
e. compound
f. pure substance.
2. O2:______.
a. pure substance
b. homogeneous mixture
c. solution
d. heterogeneous mixture
e. element
f. compound
3. N2O:______.
a. compound
b. heterogeneous mixture
c. element
d. homogeneous mixture
e. solution
f. pure substance
4. Air (mostly N 2 and O 2 ):_______.
a. homogeneous mixture
b. heterogeneous mixture
c. solution
d. pure substance
e. element
f. compound

Answers

Answer:

1. Element

2. Element

3. Compound

4 Homogeneous  mixture

Explanation:

An element is a pure substance with only one kind of atom that cannot be broken into simpler substances by chemical or physical means. Therefore when you break the nitrogen gas or oxygen gas you will still get the same element.

Compound are pure substance that can be broken into the constituent elements by a chemical means but not physical means. N2O is a compound with two different atoms. And can be broken into it constituent element through chemical means.

Homogeneous mixture are mixture that contain two or more pure substance that appear uniform through out. The mixture is evenly distributed. Example of  homogeneous mixture is Air.

HIGH SCHOOL

Although electrons have mass, they are not considered in determining the mass number of an atom. Why?

Answers

Because the most dense part of an atom is the nucleus. Not the electron cloud.
HIGH SCHOOL

A certain isotope x2+ contains 48 electrons and 75 neutrons. what is the mass number for this element?

Answers

The most important identity of an element is its atomic number or number of protons. Electrons and neutrons may vary, but protons stay constant. To start with, when an element is neutral, the number of protons and electrons are equal. When the isotope is a positive ion, that means that the element gives away 2 electrons. So, if the electrons is 48, then that means it was originally 48 - 2 = 46 electrons. From the periodic table, element 46 is Palladium (Pd).

Answer : The mass number for this element is 125.

Explanation :

Isotope : It is defined as the element that have the same number of protons but have the different number of neutrons of each of the atom.

Atomic number is defined as the number of protons or number of electrons.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and number of neutrons.

Number of neutrons = Mass number - Number of protons

As we are given :

Number of electrons in ion = 48

Number of neutrons in ion = 75

So, number of protons in ion = 48

For neutral atom, the number of electrons will be:

Number of electrons = Number of protons in ion + Charge

Number of electrons = 48 + (+2) = 48 + 2 = 50

Now we have to determine the mass number for this element.

Number of neutrons = Mass number - Number of protons

Mass number = Number of neutrons + Number protons

Mass number = 75 + 50

Mass number = 125

Therefore, the mass number for this element is 125.

MIDDLE SCHOOL

Sulfur has fewer valence electrons than chlorine. True or False

Answers

Answer:

True

Explanation:

Valence electron:

No. of electrons present in the outermost shell of any atom is called valence electrons. Valence electrons determines the chemical properties of element.

Atomic no. of S = 16

Electronic configuration of S =

Energy shell (n = 3) is the outermost shell

Valence electrons = 6

Atomic no. of Cl = 17

Electronic configuration of S =

Energy shell (n = 3) is the outermost shell

Valence electrons = 7

So, sulfur has 6 valence electrons and Cl has 7 valence electrons.

The statement 'Sulfur has fewer valence electrons than chlorine.' is true.

Answer:

true, it has more i took the test.

Explanation:

MIDDLE SCHOOL

What is anhydrous salt?

Answers

Answer:

The word “anhydrous” means without water. An anhydrous salt is only the cation and anion making up the salt. There is no water of hydration. Many salts naturally draw water from the environment and occur in nature as hydrated salt. ... For every every formula unit of copper II sulfate there are five water molecules.

Explanation:

Hope this help

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Have a nice day!!!!

Answer:

salt

Explanation:

HIGH SCHOOL

A type of hot pack uses the reaction of finely divided iron metal with oxygen from air to generate heat. Given the thermochemical equation below, how much heat can be released if 45.4 g of iron is consumed? 4 Fe(s)+3 029)2 Fe203(s) AH-1.65 MJ o a. 1.34 x 103 KJ

b. 336 kJ O

c. 672 kJ

d. 2.68 x 103kJ

e. 41.3 kJ

Answers

Answer:

b. 336 kJ

Explanation:

The molar mass of iron is 55.8 g/mol, so the number of moles for 45.4g is:

n = mass/molar mass

n = 45.4/55.8

n = 0.8136 mol

For the reaction given, 4 moles of iron will release 1.65x10³ kJ, so:

4 moles ---------------- 1.65x10³ kJ

0.8136 mol------------ x

By a simple direct three rule:

4x = 1.34x10³

x = 336 kJ

HIGH SCHOOL

What state of change do atoms or molecules become more ordered?

Answers

When they become a solid, as in a solid the particles are packed tightly together and have little space between them, thus at solid state , particles are more ordered.
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