Which of the following has the longest life a dwarf star a giant star a supernova or the sun.

Which pair of formulas represents the empirical formula and the molecular formula of a compound?

AnnyKZ [126]

Answer:

CH2O and C6H12O6

Explanation:

To find an empirical formula, take a molecular formula and divide the subscript of each element by the greatest common factor of all the subscripts. In this case, the only pair that works is CH2O,C6H12O6, which can be verified by dividing the coefficients of the molecular formula by 6.

3 0

3 years ago

Do you think genetic engineering is ethical? Explain why or why not.

kirill [66]

Answer:

Yes

Explanation:

One of the top goals of genetic engineering is the improvement of health. Imagine a world without the threat of AIDS or cancer. Those working in the genetics field hope that manipulating the genes of humans will one day enable science to prevent people from contracting these potentially deadly diseases.

4 0

3 years ago

Name two chemicals that can be used to prepare a standard solution in the Laboratory

pantera1 [17]

Answer:

Two chemicals that can be used to prepare standard solutions in lab are Hydrochloric acid & Sulphuric acid.

6 0

2 years ago

Calculate the molality of a 10.0% by mass solution of NaCl ______ m

Lubov Fominskaja [6]

Answer:

$\large \boxed{\text{0.180 mol/kg }}$

Explanation:

Assume 100 g of solution.

Then you have 10.0 g of NaCl and 90.0 g of water.

$\text{Molal concentration} = \dfrac{\text{moles of solute}}{\text{kilograms of solvent}}$

1. Moles of NaCl

$\text{Moles of NaCl} = \text{10.0 g NaCl} \times \dfrac{\text{1 mol NaCl}}{\text{58.44 g NaCl}} = \text{0.1711 mol NaCl}$

2. Kilograms of water

$\text{Kilograms} = \text{90.0 g} \times \dfrac{\text{1 kg}}{\text{1000 g}} = \text{0.0900 kg}$

3. Molal concentration

$\text{Molal concentration} = \dfrac{\text{0.1711 mol}} {\text{0.0900 kg}} = \textbf{1.90 mol/kg}\\\\\text{The molal concentration of the solution is $\large \boxed{\textbf{0.180 mol/kg }}$}$

5 0

3 years ago

A metal oxide reacts chemically with water to form a base in the reaction shown below. If the temperature of the metal oxide and

Alla [95]

increase the rate of chemical change.

Explanation:

The reaction of the metal oxide with water to form a base in the presence of a spike in temperature will lead to an increase in the rate of chemical change.

Temperature change has considerable effect on reaction rates.

Temperature is directly proportional to the average kinetic energy of reacting particles.
Reaction rates varies directly with a spike in temperature.
It has been known that for every 10°C rise in temperature, above the room temperature, reaction rates become double or tripled.
Temperature increases the kinetic energy of each of the reacting particles.
Many of the reacting particles also acquires an energy greater than or equal to the activation energy of the reaction.
The frequency of ordinary collisions and effective collisions per unit time increases.

Learn more;

Activation energy brainly.com/question/3930233

#learnwithBrainly

6 0

3 years ago