CHEMISTRY HIGH SCHOOL

Which factor is NOT used to determine a star's apparent magnitude?a
how big the star is
b
how hot the star is
c
how dense the star is
d
how far away the star is

Answers

Answer 1
Answer: B



Magnitude is about how far away the star is, how big it is, and how bright it is.

Related Questions

Why should hypothesis be testable?
The difference in the direction is caused by the ______________.Please help!
HELP I NEED HELP ASAPHELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAPA. Chlorine B. SulfurC. OxygenD. None of the above
A(n) ____________ is a substance in which all the exact combinations of elements are always the same.a.synthetic element b.compound c.mixtures d.solution
What is the difference between a cup of tea at 95°C, and a drop of tea at 95°C?

Which element has the same number of energy levels as krypton (Kr) and the same number of valence electrons as nitrogen (N) ? iron (Fe)
selenium (Se)
arsenic (As) c
alcium (Ca)

Answers

Answer:

The correct answer is the option: arsenic (As).

Explanation:

Hello!

Let's solve this!

Nitrogen is in group V period 2 and has 5 valence electrons.

The krypton is in period 4.

If we cross these two elements, the element that is in the same group as nitrogen (V) and in the same period as Kripton (4) is Arsenic. If you have any questions, we can check it on the periodic table.

We conclude that the correct answer is the option: arsenic (As).

Answer:

The answer to your question is: Arsenic (As)

Explanation:

Krypton is a noble gas located in group VIII A and 4rd period. Nitrogen is in the 5fh group.

So, we must look for an element located in the 4rd period and group VA.

Iron (Fe)               Iron is in the 4rd period and group VI B

Selenium (Se)     Selenium is in the 4rd period and group VI A

Arsenic (As)       Arsenic is in the 4rd period and group V A and group VA

Calcium (Ca)     Calcium is located in group 4rd and group IIA

When magnesium is added to hydrochloric acid, a gas is formed. Explain what happens in the reaction, how the gas is collected and how it could be tested to prove what it is.

Answers

Answer:

Explained below.

Explanation:

Formula when magnesium reacts with hydrochloric acid is given by;

Mg(s) + 2HCl(aq) = MgCl2(aq) + H2(g)

So, from the equation, we can see that the gas formed is hydrogen.

This hydrogen gas is collected by a method known as water displacement.

This gas can be tested for by holding a burning splint near to the top of the test container. The resulting effect should be a high pitched pop sound because the hydrogen gas will react with the oxygen gas in the air to result in a small explosion.

Which general trend in period 2 on the Periodic table as the elements are considered in order of increasing atomic number? 1)increasing atomic radius
2.) decreasing electronegativity
3.) increasing 1st ionization energy
4.) decreasing atomic mass

Answers

As the atomic number increase in the 2nd period, the first ionization energy also increases. Therefore, option (3) is correct.

What is the ionization energy?

The ionization energy can be described as the minimum amount of energy that is absorbed by an electron to come out of the influence of the nucleus of a gaseousatom.

In general, the atomic number of an atom increases as we move from left to right in a period on the modern periodic table. While moving from left to right, there is an increase in the effective nuclear charge while the electron enters the same electron shell.

The atomic radius of an atom in the period decreases in the order of increasing atomic number. As the effective nuclear charge is increasing large amount of energy is required to knock out the electron from an atom. Therefore, the first ionization energy also increases as the atomicnumber increase in the 2nd period.

Learn more about ionization energy, here:

brainly.com/question/16761169

#SPJ6
3.) Increasing 1st ionization energy.

The symbol Na represents a sodium atom that has lost an electron. True False

Answers

False.
Na does represent sodium, but NOT when it lost an electron. Na+ represents sdoium when it lost its electron.

A pencil has density of 0.875 g/cm^3. It has a volume of 4.0 cm^3. What is the mass?

Answers

Answer:

3.5g

Explanation:

Density=(mass)/(volume)\n Mass= Density X Volume\nMass = 0.875 X 4.0\nTherefore, Mass = 3.5 g

Answer:

3.703703703703

Explanation:

Based on intermolecular forces, which of these substances would have the highest boiling point?(1) He (3) CH4
(2) O2 (4) NH3

Answers

NH3 would have the highest boiling point because the molecules have all 3 types of bonds:
London dispersion, because all molecules do
Hydrogen Bond, because of the fact that hydrogen is present and so is Nitrogen, one of the elements that hydrogen will form a hydrogen bond with.
Dipole Bond: Because the NH3 has a lone pair

Answer: NH3

Hope this helped!!!
Based on intermolecular forces, NH3 would have the highest boiling point. 
Other Questions
What is the difference between periods and groups on the periodic table?
2. The energy of a photon that has a wavelength of 12.3 nm is _______ J.A) 2.72 x 10^-50B) 1.62 x 10^-17C) 4.42 x 10^-23D) 1.99 x 10^-25E) 1.51 x 10^-17
What is a common ancestor?
What is the term for a solid substance that is composed of minerals?