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3 years ago

Which phrase best to find a star system

Chemistry

1 answer:

Paladinen [302]3 years ago

6 0

Assuming the answers are:

a group of hundreds of stars a group of two or more stars

a group of stars that formed around the same time

a group of two stars in which one star is brighter than the other

The correct answer is b:

a group of stars that formed around the same time

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For each reaction, write the chemical formulae of the oxidized reactants in the space provided. Write the chemical formulae of t

liberstina [14]

Explanation:

First Reaction;

Ca + ZnCl2 --> CaCl2 + Zn

Oxidized Reactant: Ca. There is increase in oxidation number from 0 to +2

Reduced Reactant: Zn. There is decrease in oxidation number form +2 to 0

Second Reaction:

FeI2 + Mg --> Fe + MgI2

Oxidized Reactant: Mg. There is increase in oxidation number from 0 to +2

Reduced Reactant: Fe. There is decrease in oxidation number form +2 to 0

Third Reaction;

Mg + 2AgNO3 --> Mg(NO3)2 + Ag

Oxidized Reactant: Mg. There is increase in oxidation number from 0 to +2

Reduced Reactant: Ag. There is decrease in oxidation number form +1 to 0

5 0

3 years ago

What conclusions can you draw about the relationship between chemical structure and dye color?

allochka39001 [22]

They are both chemicals

3 0

3 years ago

You may want to reference (pages 209 - 211) section 5.4 while completing this problem. part a a weather balloon is inflated to a

IceJOKER [234]

For this question we can used the combined gas law equation
for a fixed amount of gas PV/T = constant
$\frac{P1V1}{T1} = \frac{P2V2}{T2}$
where P - pressure, V-volume and T - temperature
parameters for the first instance are given on the left side and parameters for the second instance are given on the right side of the equation.
Temperature should be in Kelvin
temperature in K = temperature in celcius + 273
T1 = 25.9 °C + 273 = 298.9 K
T2 = -13.6 °C + 273 =259.4 K
substituting the values into the equation , V - volume at the altitude can be found out
$\frac{730mmHg*26.9L}{298.9K} = \frac{370mmHg*V}{259.4 K}$
V = 46.1 L

6 0

3 years ago

What is the correct formula for magnesium sulfate

Aleksandr [31]

I guess the answer is MgO4S

6 0

3 years ago

Read 2 more answers

Scientist who have a chemical element named after them

Artyom0805 [142]

<span>There are only four elements that were named after actual scientists.
Curium [Cm] is named after Marie and Pierre Curie. The Curies worked extensively on radioactive elements so another scientist appropriately named this radioactive element after them.
Einsteinium [Es] is named after the famed physicist Albert Einstein.
Lawrencium [Lr or Lw] is named after Ernest Lawrence, who invented a machine to detect radioactivity. Lawrencium is a radioactive element. Mendelevium [Md] is named after Dimitri Mendeleef who created the modern day periodic table.</span>

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3 years ago