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2 years ago

I NEED EXPLANATIONSS!!!! Help , i have to past or my teacher will fail me .. again !!

Chemistry

1 answer:

dem82 [27]2 years ago

7 0

Answer:

Put simply, Asexual reproduction is reproduction without the use of gametes or the number of chromosomes being changed. So they are genetically identical creatures. Some animals include wasps, lizards, sharks, turkeys, and sea urchins.

Sexual reproduction includes chromosomes and gametes being fused, creating genetically different offspring. Examples of creatures that reproduce sexually are humans, chickens, cow, pigs, etc.

Explanation:

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A missile is flying at a speed of 125 m/s. If the missile has a mass of 125 kg, what’s its kinetic energy?

LenKa [72]

976,563 is the answer I got to your question

5 0

2 years ago

Read 2 more answers

Calculate the volume, in milliliters, for the following:

fredd [130]

Answer: The volume for 0.850 mol of $NaNO_{3}$ from a $NaNO_{3}$ solution is 1700 mL.

The volume of 30.0 g of LiOH from a 2.70 M LiOH solution is 464 mL.

Explanation:

Molarity is the number of moles of solute present in a liter of solution.

As given moles of $NaNO_{3}$ are 0.850 mol and molarity of $NaNO_{3}$ solution is 0.5 M. Hence, its volume is calculated as follows.

$Molarity = \frac{no. of moles}{Volume (in L)}\\0.5 M = \frac{0.850 mol}{Volume}\\Volume = 1.7 L (1 L = 1000 mL)\\= 1700 mL$

Therefore, the volume for 0.850 mol of $NaNO_{3}$ from a $NaNO_{3}$ solution is 1700 mL.

As given mass of LiOH are 30.0 g from a 2.70 M LiOH (molar mass = 23.95 g/mol) solution. Hence, its number of moles are calculated as follows.

$No. of moles = \frac{mass}{molar mass}\\= \frac{30.0 g}{23.95 g/mol}\\= 1.25 mol$

So, volume for LiOH solution is calculated as follows.

$Molarity = \frac{no. of moles}{Volume (in L)}\\2.70 M = \frac{1.25}{Volume}\\Volume = 0.464 L (1 L = 1000 mL)\\= 464 mL$

Therefore, volume of 30.0 g of LiOH from a 2.70 M LiOH solution is 464 mL.

6 0

3 years ago

4 FeCO3 + O2 --> 2 Fe2O3 + 4CO2

Andre45 [30]

The percentage yield of the reaction : 93.3%

Mass of FeCO₃ 2310.44 g

<h3>Further explanation </h3>

The reaction equation is the chemical formula of reagents and product substances

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products

Reaction

4 FeCO₃ + O₂ ⇒ 2 Fe₂O₃ + 4CO₂

MW FeCO₃ : 115,854 g/mol

MW Fe₂O₃ : 159,69 g/mol

mol FeCO₃

$\tt \dfrac{35}{115.854}=0.302$

mol Fe₂O₃

$\tt \dfrac{2}{4}\times 0.302=0.151$

mass Fe₂O₃

$\tt 0.151\times 159.69=24.113~g$

percent yield

$\tt \dfrac{22.5}{24.113}\times 100\%=93.3\%$

mol of 1 kg Fe₂O₃ = 1000 g

$\tt \dfrac{1000}{159.69}=6.262$

mol of FeCO₃

$\tt \dfrac{4}{2}\times 6.262=12.524$

mass of FeCO₃

$\tt 12.524\times 115.854=1450.955~g$

a purity of 62.8%

$\tt \dfrac{100}{62.8} \times 1450.955=2310.44~g$

4 0

3 years ago

Choose the number for the word the description matches.

rosijanka [135]

Area where magnet is present - magnetic feild
the 2 ends are the poles
magnetic in presence is temporary and always magnetic is permanent
opposites is dipolar<span />

5 0

3 years ago

Which quantity is equivalent to 1 millisecond?

rusak2 [61]

Answer:

C. 0.001 second

Explanation:

Millisecond is a subunit of a second.

Milli depicts a unit to the power of 10⁻³

So;

1 millisecond = 10⁻³ s

Therefore,

1 x 10⁻³ = 0.001s

The solution to this problem is choice C which is 0.001 second

3 0

2 years ago