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4 years ago

Which question cannot be explained by chemistry?

Chemistry

2 answers:

Ostrovityanka [42]4 years ago

8 0

C. How does a convention oven cook food?

Mars2501 [29]4 years ago

8 0

Answer:

How does a convection oven cook food?

Explanation:

In the world everything related to matter, its reaction, its production, the properties and the laws which govern the reactions and properties are considered in chemistry.

However for simplification we study the reactions or chemical change in chemistry and the physical interactions between heat or energy with matter in physics.

So the yeast make bread dough rise (due to oxygen), the dissolution of sugar faster in hot water, or peeled apples turn brown (oxidation) are chemical phenomenon.

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3 years ago

Why is important to only test one variable at a time?

Natalija [7]

Answer:

Explanation:

It is important to only test one variable at a time because you need to be able to disprove or prove a problem with just one independent variable. When you have several variables in the experiment, it would be impossible to know which variable honestly caused the end result.

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3 years ago

To get more electric current , we have to connect them in ______ combination.

Sever21 [200]

Answer:

A third type of circuit involves the dual use of series and parallel connections in a circuit; such circuits are referred to as compound circuits or combination

Explanation:

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3 years ago

A substance undergoes a change. Which of the following indicates that the change was a chemical change? The substance changed sh

MariettaO [177]

In order to form new molecules, a chemical reaction would have to occur which means the change would be a chemical change.

3 0

3 years ago

Read 2 more answers

Suppose of copper(II) acetate is dissolved in of a aqueous solution of sodium chromate. Calculate the final molarity of acetate

uranmaximum [27]

Answer:

0.0714 M for the given variables

Explanation:

The question is missing some data, but one of the original questions regarding this problem provides the following data:

Mass of copper(II) acetate: $m_{(AcO)_2Cu} = 0.972 g$

Volume of the sodium chromate solution: $V_{Na_2CrO_4} = 150.0 mL$

Molarity of the sodium chromate solution: $c_{Na_2CrO_4} = 0.0400 M$

Now, when copper(II) acetate reacts with sodium chromate, an insoluble copper(II) chromate is formed:

$(CH_3COO)_2Cu (aq) + Na_2CrO_4 (aq)\rightarrow 2 CH_3COONa (aq) + CuCrO_4 (s)$

Find moles of each reactant. or copper(II) acetate, divide its mass by the molar mass:

$n_{(AcO)_2Cu} = \frac{0.972 g}{181.63 g/mol} = 0.0053515 mol$

Moles of the sodium chromate solution would be found by multiplying its volume by molarity:

$n_{Na_2CrO_4} = 0.0400 M\cdot 0.1500 L = 0.00600 mol$

Find the limiting reactant. Notice that stoichiometry of this reaction is 1 : 1, so we can compare moles directly. Moles of copper(II) acetate are lower than moles of sodium chromate, so copper(II) acetate is our limiting reactant.

Write the net ionic equation for this reaction:

$Cu^{2+} (aq) + CrO_4^{2-} (aq)\rightarrow CuCrO_4 (s)$

Notice that acetate is the ion spectator. This means it doesn't react, its moles throughout reaction stay the same. We started with:

$n_{(AcO)_2Cu} = 0.0053515 mol$

According to stoichiometry, 1 unit of copper(II) acetate has 2 units of acetate, so moles of acetate are equal to:

$n_{AcO^-} = 2\cdot 0.0053515 mol = 0.010703 mol$

The total volume of this solution doesn't change, so dividing moles of acetate by this volume will yield the molarity of acetate:

$c_{AcO^-} = \frac{0.010703 mol}{0.1500 L} = 0.0714 M$

8 0

4 years ago