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2 years ago

Classify the following reaction:

Chemistry

2 answers:

suter [353]2 years ago

6 0

Answer:

D) I think is single displacement (replacement)

Flura [38]2 years ago

6 0

Answer:

Combination

Explanation:

When two or more reactants combine together to form a single product that reaction is called combustion.

Here CaO and H_2O are combining to form Ca(OH)_2

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Which item is made from an alloy? A. steel tray B. glass plate C. credit card D. copper wire

Naya [18.7K]

Not sure if this is correct but i would choose the steel tray.

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2 years ago

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What is the highest energy to which doubly ionized helium atoms (alpha particles) can be accelerated in a DC accelerator with 3

pentagon [3]

Answer:

Highest energy will be equal to $9.6\times 10^{-13}J$

Explanation:

Charged on doubly ionized helium atom $q=2e=2\times 1.6\times 10^{-19}C=3.2\times 10^{-19}C$

It is accelerated with maximum voltage of 3 MV

So voltage $V=3\times 10^6volt$

Now energy is given by $E=qV=3.2\times 10^{-19}\times 3\times 10^6=9.6\times 10^{-13}J$

So highest energy will be equal to $9.6\times 10^{-13}J$

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3 years ago

How many phosphorous atoms are found in three molecules of magnesium phosphate, 3Mg3(PO4)2?

aleksandr82 [10.1K]

Answer: Option (d) is the correct answer.

Explanation:

Since the given formula is $3Mg_{3}(PO_{4})_{2}$ . According to cross method formula, magnesium has +2 charge so, $PO_{4}$ is multiplied by 2.

Thus, 1 molecule of magnesium phosphate will contain 2 atoms of phosphorus.

Therefore, three molecules of magnesium phosphate contains following number of atoms.

Mg = 9

P = 6

O = 24

Hence, we can conclude that there are 6 atoms of phosphorus in three molecules of magnesium phosphate, $3Mg_{3}(PO_{4})_{2}$ .

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3 years ago

Which of the following is not an example of a chemical change?

ale4655 [162]

Salt dissolving in a glass of water, using electricity to break down water into hydrogen and oxygen, rust forming on an iron fence and gas burning on a stove.

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2 years ago

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The heaviest commonly used United States coin is the half dollar, which has a mass of 11.340g. The lightest United States coin i

Kruka [31]

Answer:

13.6×10^3

Explanation:

11.340+2.268= 13.608

7 0

3 years ago