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2 years ago

Scientists discovered that stars i.n the universe are mostly composed of which elements?

Chemistry

2 answers:

8_murik_8 [283]2 years ago

6 0

I dunno what you mean sorry can't help you

KiRa [710]2 years ago

3 0

Scientists discovered that stars are mostly composed of HYDROGEN.
Hydrogen is the most abundant element out of all the elements in the universe and it makes up three quarter of all matter. As an element it has the smallest atomic number.

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Which has more thermal energy, 500g of ice or 500g of steam? explain your answer.

RUDIKE [14]

Steam because steam comes from water which the energy makes it into steam

7 0

3 years ago

Answer Quick

kow [346]

Answer:

20.9%

Explanation:

The percentage by mass of solution is given by dividing the mass of solute in grams by the mass of solution in grams then multiplying it by 100%.

% Mass of solution = mass of solute/mass of solution × 100%

= (27.0 g/ 129.0 g) × 100%

= 20.93%

= 20.9%

7 0

3 years ago

Read 2 more answers

Which opinion would be an example of an alloy brass or silver or gold or copper

frutty [35]

Answer:

Gold and copper are example of alloy

Explanation:

8 0

2 years ago

If the pH of vinegar is 3.0, what is the concentration of H+ in vinegar?

Cerrena [4.2K]

Answer: The concentration of $H^{+}$ ions in vinegar is 0.001 M.

Explanation:

Given: pH = 3.0

pH is the negative logarithm of concentration of hydrogen ion.

The expression for pH is as follows.

$pH = - log [H^{+}]$

Substitute the value into above expression as follows.

$pH = - log [H^{+}]\\3.0 = - log [H^{+}]\\conc. of H^{+} = antilog (- 3.0)\\= 0.001 M$

Thus, we can conclude that the concentration of $H^{+}$ ions in vinegar is 0.001 M.

5 0

2 years ago

Automobile bodies contain significant amounts of iron. The iron is protected by the addition of zinc. This is called galvanizati

Oksana_A [137]

Answer: The balanced chemical equation is written below.

Explanation:

Galvanization is defined as the process in which a protective layer of zinc is applied to iron or steel to prevent the metal from rusting.

Zinc prevents the oxidation of iron and acts as a reducing agent in the process.

The half reaction for the process follows:

Oxidation half reaction: $Zn\rightarrow Zn^{2+}+2e^-$

Reduction half reaction: $Fe^{2+}+2e^-\rightarrow Fe$

Net chemical equation: $Zn+Fe^{2+}\rightarrow Zn^{2+}+Fe$

Hence, the balanced chemical equation is written above.

6 0

3 years ago