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2 years ago

Can someone please help me with this question

Chemistry

2 answers:

Tpy6a [65]2 years ago

8 0

Answer:

The answer is the first one.

Acceleration is the change of velocity

Velocity is another term for speed with direction.

Licemer1 [7]2 years ago

4 0

Answer:

the second one I think...

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Which of the following is always a reactant in a combustion reaction?

Marina86 [1]

Answer:

Oxygen

Explanation:

Any Hydrocarbon + Oxygen ----> Carbon Dioxide + H2O (Water vapour, gas, water)

5 0

3 years ago

Read 2 more answers

Suppose 2.4 g of Mg reacts with 10.0 g of O2, to create magnesium oxide. How much magnesium oxide is produced?

o-na [289]

Answer:

3.98 g

Explanation:

Step 1. Write the balanced chemical reaction. In this case, magnesium reacts with oxygen to produce magnesium oxide:

$2~Mg(s) + O_2 (g)\rightarrow 2~MgO (s)$

Step 2. Calculate the number of moles of magnesium:

$n_{Mg} = \frac{2.4~g}{24.305~g/mol} = 0.0987~mol$

Step 3. Calculate the number of moles of oxygen:

$n_{O_2} = \frac{10.0~g}{32.00~g/mol} = 0.3125~mol$

Step 4. Identify the limiting reactant comparing the equivalents. Equivalent of Mg:

$eq_{Mg} = \frac{0.0987~mol}{1} = 0.0987~mol$

Equivalent of oxygen:

$eq_{O_2} = \frac{0.3125~mol}{2} = 0.15625~mol$

Therefore, Mg is the limiting reactant.

Step 5. According to the stoichiometry of this reaction:

$n_{Mg} = n_{MgO} = 0.0987~mol$

Step 6. Convert the number of moles of MgO into mass:

$m_{MgO} = 0.0987~mol\cdot 40.304~g/mol = 3.98~g$

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3 years ago

Where do an organisms genes come from?

andriy [413]

Answer:

Organisms genes come from both mother and father :3

Explanation:

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3 years ago

Which of these metals reacts more vigorously with water? <br><br> 1. Zinc <br> 2. Magnesium

GalinKa [24]

Answer:

magnesium

Explanation:

because zinc does not react with water because it too forms a protective layer of insoluble.

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2 years ago

Fossils of a now extinct dinosaur have been found near the east coast of South America and the west coast of Africa. The dinosau

Temka [501]

Answer:

The Glossopteris fossil is found in Australia, Antarctica, India, South Africa, and South America—all the southern continents. Now, the Glossopteris seed is known to be large and bulky and therefore could not have drifted or flown across the oceans to a separate continent

Explanation:

Your welcome

6 0

3 years ago