Ask question

Ask question

All categories

3 years ago

15

For her school Science Fair, Alyssa designs an experiment to learn more about erosion. Her experimental set up is shown below. W

hat is the INDEPENDENT VARIABLE?

1 answer:

shutvik [7]3 years ago

8 0

Answer:

if I am going to answer I need the set up

Explanation:

please show the set up and I will answer the question

You might be interested in

How many molecules of ethane are present in 64.28 liters of ethane gas (C2H6) at STP

Rom4ik [11]

Answer : The molecule of ethane present in 64.28 L of ethane gas at STP is, $17.277\times 10^{23}$ molecule.

Solution :

At STP,

22.4 L volume of ethane present in 1 mole of ethane gas

64.28 L volume of ethane present in $\frac{64.28L}{22.4L}\times 1mole=2.869moles$ of ethane gas

And, as we know that

1 mole of ethane molecule contains $6.022\times 10^{23}$ molecules of ethane

2.869 moles of ethane molecule contains $2.869\times 6.022\times 10^{23}=17.277\times 10^{23}$ molecules of ethane

Therefore, the molecule of ethane present in 64.28 L of ethane gas at STP is, $17.277\times 10^{23}$ molecule.

4 0

3 years ago

Read 2 more answers

Hydrogen sulfide is composed of two elements: hydrogen and sulfur. in an experiment, 6.500 g of hydrogen sulfide is fully decomp

LiRa [457]

Hydrogen sulfide = hidrogen + sulfur

6.500 g

a) 0.384 g + x

=> 6.500 = 0.384 + x => x = 6.500 - 0.384 = 6.116 g

Answer: 6.116 g of sulfur must be obtained

b) this experiment demonstrate the conservation of mass.

c) Dalton's atomic model states that the atoms cannot be created, split or be destroyed, and so in a chemical reaction the atoms rearrange but the number of each type of atoms remain constant, so the mass of each type of atoms and the total mass remain constant.

8 0

4 years ago

sladkih [1.3K]

Answer:

A = 65.46 u

Explanation:

Given that,

The composition of zinc is as follows :

Zn-64 = 48.63%

Zn-66 = 27.90%

Zn-67 = 4.10%

Zn-68 = 18.75%

Zn-70 = .62%

We need to find the average atomic mass of the given element. It can be solved as follows :

$A=\dfrac{48.63\times 64+27.90\times 66+4.1\times 67+18.75\times 68+0.62\times 70}{100}\\A=65.46\ u$

So, the average atomic mass of zinc is 65.46 u.

6 0

3 years ago

Answers only please 100pts and brainliest. you will be reported for wrong answers.

Ierofanga [76]

Answer:

K= 25.16%

Mn= 34.59%

O= 40.25%

Explanation:

$KMnO_4$

Find the total mass of the compound. You can do this by multiplying by the molar mass.

$K=40*1=40\\Mn=55*1=55\\O=16*4=64$

add them:

40+55+64=159g

Now convert each element individually to grams using molar mass

$1molK(\frac{40gK}{1molK} )=40gK$

$1molMn(\frac{55gMn}{1molMn} )=55gMn$

$4molO(\frac{16gO}{1molO})=64gO$

Divide by the mass of the compound and multiply by 100

$K=\frac{40g}{159g} *100=25.16$

$Mn=\frac{55g}{159g}*100=34.59$

$O=\frac{64g}{159g}*100=40.25$

5 0

3 years ago

Read 2 more answers

Is "dissolving in water" a chemical change or a physical change?

Schach [20]

Answer:

In fact this should be considered more of a continuum. For example salt dissolving in water is usually considered to be a physical change, however the chemical species in salt solution (hydrated sodium and chlorine ions) are different from the species in solid salt.

Explanation:

Hope this helps! Brainly me <3

8 0

3 years ago

Read 2 more answers