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3 years ago

Witch event signals the birth of a star

Chemistry

2 answers:

tiny-mole [99]3 years ago

6 0

I am pretty sure D have a great rest of your day or night either one :)

qaws [65]3 years ago

4 0

Answer:

It's either C or D

Explanation:

I'm learning this too! :)

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When you add "plant food" to your potted geraniums, you are actually providing the plant with _____. View Available Hint(s) When

Dmitry [639]

Answer:

minerals

Explanation:

A potted geranium is plant that is capable of manufacturing complex carbohydrates from sugar synthesized through the process of photosynthesis.

<em>The process of photosynthesis primarily requires water and carbohydrate together with resources such as essential minerals. Hence, when a plant food is added to a plant, the most plausible term this refers to is minerals. This is because food contains minerals necessary for various metabolic activities of living organisms.</em>

7 0

3 years ago

Two or more atoms joined together form a _______

Verdich [7]

Answer:

When two atoms join together they make compounds

Explanation:

A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds.

5 0

3 years ago

PLEASE IN NEED HELP ASAP

Solnce55 [7]

Because nothing appeared he concluded that <span>that living things could NOT just appear or come from nonliving things like water and air</span>

3 0

4 years ago

what do the presence of fish and a wide diversity of invertebrates in a river indicate regarding water quality?

astra-53 [7]

It indicates that the river water is very good quality with nutrients and minerals to support an ecosystem.

7 0

3 years ago

SYNTHESIS OFCARBONATECTIONLABORATORY SIMULATIONLab Data- X99.00.10CollectedVolume sodium carbonate (mL)Molarity sodium carbonate

evablogger [386]

Answer:

$\begin{gathered} \text{Limiting Reagent = Sodium Carbonate} \\ \text{Percent Yield = 98\%} \end{gathered}$

Explanation:

The chemical reaction talks about the synthesis of calcium carbonate

It is from the reaction between sodium carbonate and calcium chloride

Let us write the equation of reaction as follows:

$Na_2CO_{3(aq)}+CaCl_{2(aq)}\text{ }\rightarrow2NaCl_{(s)\text{ }}+CaCO_{3(aq)}$

Firstly, we want to get the expected mass of calcium carbonate

This speaks about getting the theoretical yield based on the equation of reaction

From the data collected, 90 ml of 0.20 M (mol/L) of sodium carbonate gave calcium carbonate

We need to get the actual number of moles of sodium carbonate that reacted

We can get this by multiplying the volume by the molarity (kindly note that we have to convert the volume to Liters by dividing by 1000)

Thus, we have it as:

$\frac{90}{1000}\times\text{ 0.1 = 0.009 moles}$

Hence, we see that 0.009 moles of sodium carbonate reacted theoretically

Since 1 mole of sodium carbonate gave 1 mole calcium carbonate, it is expected that 0.009 mole of sodium carbonate will give 0.009mole of calcium carbonate

What we have to do now is to get the theoretical grams of calcium carbonate produced

That would be the product of the number of moles of calcium carbonate and its molar mass

The molar mass of calcium carbonate is 100 g/mol

The theoretical yield (expected mass) is thus:

$100\text{ g/ mol }\times\text{ 0.009mol = 0.9 g}$

Finally, we proceed to get the percentage yield which is calculated using the formula below:

$\text{Percent Yield = }\frac{Actual\text{ yield}}{\text{Theoretical yield}}\times\text{ 100 \%}$

The actual yield is the observed mass which is given as 0.88 g

The percent yield is thus:

$\frac{0.88}{0.9}\times\text{ 100 = }98\text{ \%}$

7 0

1 year ago