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4 years ago

What properties you can observe or measure?

1 answer:

4 0

We can observe physical properties of elements and compounds without changing the substance.

Examples of physical properties: Density, color, boiling point, state of matter, appearance: dull or shiny, etc.

But we can also observe and measure chemical properties by reacting a substance with something else. For example, like mixing baking soda and vinegar together. The vinegar reacts with the baking soda and produces carbon dioxide: a new substance.

Some examples of chemical properties: Flammability, amount of heat that is released during combustion, toxicity (how much damage it causes to other organisms), radioactivity, and ability to oxidize (when you have metal that becomes rusty looking).

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While watching tv in your room one nigh, you decide to have some Oreos and a glass of milk. there were only 3 Oreos and science

sveta [45]

Answer:

yes it did.

Explanation:

the product must have produced a smell therefore it created a gas. this means it was a chemical reaction

8 0

3 years ago

A student is given a solution of phenol red of unknown concentration. Solutions of phenol red are bright pink under basic condit

azamat

The hydrogen ion concentration, [H ], in the solution of phenol red solution of pH 11.20 is 6.3 X $10^{-12}$ moles/litre.

Explanation:

Data given:

basic solution of phenol red is given as it has pH of 11.2

hydrogen ion concentration = ?

the hydrogen ion concentration is calculated by using the following formula:

pH = - $log_{10}$ [ $H^{+}$ ]

Rearranging the equation:

[ $H^{+}$ ] = $\frac{1}{10^{pH} }$

Putting the values in the above equation:

[ $H^{+}$ ] = $\frac{1}{10^{11.2} }$

[ $H^{+}$ ] = 6.3 X $10^{-12}$ moles/litre

The hydrogen ion concentration is very small and the solution of phenol red is basic in nature. The pH of 11.2 also indicates that solution is basic and teh color of the solution is bright pink.

3 0

4 years ago

If the atomic mass of 1 oxygen atom is 15.9994 amu, how much mass does of 1 mole oxygen have?

IrinaK [193]

Answer:

15.9994 amu

Explanation:

By definition 1 mole of any substance is the mass that contains 1 Avogadro's Number of particle. (=> 6.02 x 10²³ particles/mole).

1 mole Oxy => 15.9994 amu => contains 6.02 x 10²³ particles Oxy /mole

1 mole Sulfur => 32.064 amu => contains 6.02 x 10²³ particles Sulfur /mole

1 mole H₂O => 18 amu => contains 6.02 x 10²³ molecules of water / mole.

6 0

3 years ago

Ammonia and hydrogen fluoride both have unusually high boiling points due to

nexus9112 [7]

Answer:

C. hydrogen bonding

Explanation:

Ammonia and hydrogen fluoride are both able to exhibit hydrogen bonding due to containing nitrogen (in ammonia) and fluoride (obviously in hydrogen fluoride). Remember the unique qualities of NOF. :)

5 0

4 years ago

What is the correct ionic equation, including all coefficients, charges, and phases for the following sets of reactants? Assume

natta225 [31]

Answer:

Ba(OH)2(aq)+H2SO4(aq) gives us 2BaH+H2O

Explanation:

5 0

3 years ago