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3 years ago

The properties of matter depend on the types of atoms a substance is made of. true of false?

Chemistry

2 answers:

EastWind [94]3 years ago

6 0

true 100% i just had a quiz on this.

Irina18 [472]3 years ago

4 0

False pls mark brainliest

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Suppose you had a 2.4 g cracker burn down to 1.3 g, which raised the temperature of 50.1 g of water by 12.0 degrees Celsius. How

babunello [35]

Answer:

We know that the specific heat of water is:

c = 1cal/g*°C

This means, that we need 1 cal to increase the temperature of 1 gram of water by 1°C

Here, we increased the temperature of 50.1g of water by 12°C

Then the number of calories needed to do this is given by:

x = (mass of water in grams)*(how much increased the temp in °C)*1cal/g*°C

x = (50.1g*12°C)*1cal/g*°C = 601.2 cal

But we want this in Kcal, remember that:

1Kcal = 1000cal

Then:

601.2 cal = (601.2/1000) Kcal = 0.6012 Kcal

Now, for the cracker part, the energy was released by the amount of cracker that was burned.

The original mass was 2.4g

the final mass ios 1.3g

the difference is:

2.4g - 1.3g = 1.1g

This means that 1.1g was the burned mass.

The number of kilocalories of heat per gram released by the cracker is just:

n = (0.6012 Kcal)/(1.1 g) = 0.547 Kcal/g

0.547 kilocalories per gram.

7 0

2 years ago

An object has a mass of 20 g and volume of 10 cm. Enter the numerical value for the density of the object in units of g/cmº

Nady [450]

Answer:

density = 2g/cm³

Explanation:

density = mass/volume

mass = 20g

volume = 10cm³

density = 20g/10cm³

density = 2g/cm³

6 0

3 years ago

74) A solution is prepared by dissolving 0.60 g of nicotine (a nonelectrolyte) in water to make 12 mL of solution. The osmotic p

dusya [7]

Answer:

molar mass of nicotine will be 162.16g/mol

Explanation:

The mass of nicotine taken = 0.60g

The volume of solution = 12mL

the osmotic pressure of solution = 7.55 atm

Temperature in kelvin =298.15K (25+ 273.15)

The formula which relates osmotic pressure and concentration (moles per L) is:

π = MRT

Where

π = osmotic pressure (unit atm) = 7.55 atm

M = molarity (mol /L)

T= temperature = (K) = 298.15 K

R = gas constant = 0.0821 L atm /mol K

Putting values

$7.55=MX0.0821X298.15$

Therefore

$M=\frac{7.55}{0.0821X298.15}=0.308\frac{mol}{L}$

Molarity is moles of solute dissolve per litre of solution

The volume of solution in litre = 0.012 L

$molarity=\frac{moles}{V}$

$moles=molarityXvolume=0.308X0.012=0.0037mol$

we know that

$moles=\frac{mass}{ymolarmass}$

molar mass = $\frac{mass}{moles}=\frac{0.60}{0.0037}=162.16\frac{g}{mol}$

5 0

3 years ago

Which state of matter has the most movement of its particles?

mars1129 [50]

Answer:

solids...............

6 0

2 years ago

Read 2 more answers

The blue colour of the sky results from the scattering of sunlight by air molecules. Blue light has a frequency if about 7.5*10^

erastovalidia [21]

Answer: The energy of a mole of photon associated with this frequency is $49.5\times 10^{-20}J$

Explanation:

The energy and frequency are related by :

$E=N\times h\times \nu$

E = energy of photon

N = number of moles = 1

h = planks constant = $6.6\times 10^{-34}Js$

$\nu$ = frequency = $7.5\times 10^{14}Hz$

$E=1\times 6.6\times 10^{-34}Js\times 7.5\times 10^{14}s^{-1}=49.5\times 10^{-20}J$

The energy of a mole of photon associated with this frequency is $49.5\times 10^{-20}J$

6 0

2 years ago