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3 years ago

Help Me Please I would really appreciate it!!!!

Chemistry

1 answer:

QveST [7]3 years ago

6 0

Answer:

How much sunlight each flashlight gets (or doesn't get)

Explanation:

The independent variable is the variable that the investigator changes.

You are controlling the amount of sunlight each flashlight gets (or doesn't get).

B is wrong. The amount of decay is the dependent variable.

C is wrong. The type of plastic should be a controlled variable.

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Describe the motion of objects that are viewed from your reference frame both inside and outside while you travel inside a movin

Nutka1998 [239]

Answer:

2 c

Explanation:

8 0

3 years ago

In an experiment, a 0.5297 g sample of diphenylacetylene (C14H10) is burned completely in a bomb calorimeter. The calorimeter is

V125BC [204]

Answer:

the Molar heat of Combustion of diphenylacetylene $(C_{14}H_{10})$ = $-6.931 *10^3 \ kJ/mol$

Explanation:

Given that:

mass of diphenylacetylene $(C_{14}H_{10})$ = 0.5297 g

Molar Mass of diphenylacetylene $(C_{14}H_{10})$ = 178.21 g/mol

Then number of moles of diphenylacetylene $(C_{14}H_{10})$ = $\frac{mass}{molar \ mass}$

= $\frac{0.5297 \ g }{178.24 \ g/mol}$

= 0.002972 mol

By applying the law of calorimeter;

Heat liberated by 0.002972 mole of diphenylacetylene $(C_{14}H_{10})$ = Heat absorbed by $H_2O$ + Heat absorbed by the calorimeter

Heat liberated by 0.002972 mole of diphenylacetylene $(C_{14}H_{10})$ = msΔT + cΔT

= 1369 g × 4.184 J g⁻¹°C⁻¹ × (26.05 - 22.95)°C + 916.9 J/°C (26.05 - 22.95)°C

= 17756.48 J + 2842.39 J

= 20598.87 J

Heat liberated by 0.002972 mole of diphenylacetylene $(C_{14}H_{10})$ = 20598.87 J

Heat liberated by 1 mole of diphenylacetylene $(C_{14}H_{10})$ will be = $\frac{20598.87 \ J}{0.002972 \ mol}$

= 6930979.139 J/mol

= 6930.98 kJ/mol

Since heat is liberated ; Then, the Molar heat of Combustion of diphenylacetylene $(C_{14}H_{10})$ = $-6.931 *10^3 \ kJ/mol$

3 0

3 years ago

Read 2 more answers

The highest tides of the year are neap tides. True False

just olya [345]

I think its false...

8 0

3 years ago

Read 2 more answers

What is the concentration of a solution?

Nimfa-mama [501]

The concentration of a substance is the quantity of solute present in a given quantity of solution.

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3 years ago

A student performs an experiment similar to what you will be doing in lab, except using titanium metal instead of magnesium meta

Genrish500 [490]

Answer:

n = 0.0022 mol

Explanation:

Moles is denoted by given mass divided by the molar mass ,

Hence ,

n = w / m

n = moles ,

w = given mass ,

m = molar mass .

From the information of the question ,

w = 0.108 g

As we known ,

The molar mass of titanium = 47.867 g / mol

The mole of titanium can be caused by using the above relation , i.e. ,

n = w / m

n = 0.108 g / 47.867 g / mol

n = 0.0022 mol

7 0

3 years ago