A__ is two or more substances that are together in the same place but are not chemically ( combined.

Chemistry

1 answer:

gayaneshka [121]3 years ago

7 0

Answer:

yeah

Explanation:

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The highest level of organization for living things is the biosphere; it encompasses all other levels. The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.

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In which compound is the percent by mass of oxygen greatest?

Licemer1 [7]

Answer: BeO

Explanation:

percent by mass of oxygen $=\frac{\text {mass of oxygen}}{\text {Total mass of substance}}\times 100\%$

percent by mass of oxygen in BeO $=\frac{16g}{25.01g/mol}\times 100=63.97\%$

percent by mass of oxygen in MgO $=\frac{16g}{40.30g/mol}\times 100=39.70\%$

percent by mass of oxygen in CaO $=\frac{16g}{56.08g/mol}\times 100=28.53\%$

percent by mass of oxygen in SrO $=\frac{16g}{103.62g/mol}\times 100=15.44\%$

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3 years ago

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When the ideal gas law is arranged as shown below, what property of the gas is being solved for (represented by the X)? x equals

Mkey [24]

That's kind of a ponderous way to describe it, but your 'X' represents
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3 years ago

A standard solution contained 0.8 mg/mL. A student took 2 mL of the standard solution and added 10 mL of water. What is the new/

galben [10]

To get the concentration of the second solution let us use the following formulae

C1V1=C2V2 where C1 is concentration of first solution and V1 is the volume of solution first solution. on the other hand C2 is the concentration of second solution and V2 is the volume of second solution.

therefore

0.8×2=(2+10)×C2
1.6 =12×C2
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A 52.0 g of Copper (specific heat=0.0923cal/gC) at 25.0C is warmed by the addition of 299 calories of energy. find the final tem

Leto [7]

Answer : The final temperature of the copper is, $87.29^oC$