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2 years ago

REALLY NEED HELP. TAKING A TIMED TEST. 15 POINTS

Chemistry

1 answer:

zimovet [89]2 years ago

7 0

The F atom . Oxygen has a -2 charge and fluorine has a +1 charge

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Strontium nitrate, Sr(NO3)2, is used in fireworks to produce brilliant red colors, Suppose we need to prepare 366.6 ml. of 0.115

natulia [17]

Answer:

$\boxed{\text{8.91 g}}$

Explanation:

1. Calculate the moles of Sr(NO₃)₂

$n = \text{366 mL} \times \dfrac{\text{0.115 mmol}}{\text{1 mL}}= \text{42.09 mmol}$

2. Calculate the mass of SrNO₃)₂

$m = \text{42.09 mmol} \times \dfrac{\text{211.63 mg}}{\text{1 mol}}= \text{8910 mg} = \text{8.91 g}\\\text{The mass of strontium nitrate required is }\boxed{\textbf{8.91 g}}$

3 0

3 years ago

A student dissolved 3.50g of copper (II) nitrate in water and mixed it with a solution of sodium carbonate. The student recovere

Arisa [49]

Answer: If the theoretical yield is 2.35g then the percent yield is 80.4%

Explanation:

Given: Actual yield = 1.89 g

Theoretical yield = 2.35 g

Formula used to calculate the percentage yield is as follows.

$Percent yield = \frac{actual yield}{theoretical yield} \times 100$

Substitute the values into above formula as follows.

$Percent yield = \frac{actual yield}{theoretical yield} \times 100\\= \frac{1.89}{2.35} \times 100\\= 80.4 percent$

Thus, we can conclude that if the theoretical yield is 2.35g then the percent yield is 80.4%

3 0

2 years ago

Define transparent ,translucent ,opaque materials?

zlopas [31]

Transparent - when light is in context with transparent materials almost all of the the light is allowed to go through these materials.
Ex: glass

Translucent- materials that do not allow light to pass through easily.
Ex: tissue paper

Opaque- materials that allow no light to go through them .
Ex: wood

5 0

2 years ago

Read 2 more answers

Entrance Question: What is a physical trait? Explain using complete sentences.

azamat

Answer: A physical trait is a defining aspect or feature of your body or other subject that you can see visually.

Explanation:

6 0

2 years ago

How many moles of argon would you have if you have 25 L of argon?

Anarel [89]

Answer: 39.948 grams

Explanation:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Argon, or 39.948 grams

4 0

2 years ago