When science is used to create a new instrument, such as a cell phone, we say that a new ___________ has been developed.

Chemistry

1 answer:

kari74 [83]4 years ago

3 0

Is it Technology? What have you already tried?

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The Mass Of The Products Of A Chemical Reaction Is __________< The Mass Of The Reactants. (Law Of Conaervation Of Mass)

Masteriza [31]

<span>The Mass Of The Products Of A Chemical Reaction Is equal to The Mass Of The Reactants.</span>

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4 years ago

Calculate the percentage by mass of the indicated element in the following compounds.

jarptica [38.1K]

Answer: The mass percent of carbon in acetylene is 92.31 %.

Explanation:

In $C_2H_2$ , there are 2 carbon atoms and 2 hydrogen atoms.

To calculate the mass percent of element in a given compound, we use the formula:

$\text{Mass percent of carbon}=\frac{\text{Mass of carbon}}{\text{Molar mass of acetylene}}\times 100$

Mass of carbon = $2\times 12g/mol=24g$

Mass of acetylene = $2\times 12g/mol+2\times 1g/mol=26g$

Putting values in above equation, we get:-

$\text{Mass percent of carbon}=\frac{24}{26}\times 100=92.31\%$

Hence, the mass percent of carbon in acetylene is 92.31 %.

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3 years ago

Which statement best describes the lattice structure of solid sodium chloride?

zlopas [31]

It is A , each sodium ion is surrounded by one chloride ion . the explanation is because Chlorine needs one more electron to have a full outer most shell , and sodium has one electron in its outer most shell .

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3 years ago

Two or more elements chemically combined make a?

In-s [12.5K]

Tqo or more elements combine to make a compound.

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3 years ago

Answer the in under 30 minutes and I will give brainliest

gtnhenbr [62]

Answer: I believe the answer is an earthquake.

Explanation: Sorry If I am wrong!

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3 years ago