2 years ago

Which of these choices is the best definition of absolute dating?

1 answer:

4 0

Answer:

I think it's A because the sedimentary rock is also involved in finding the fossils to determine their phenotype and their roots.

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Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the following equation: CO2(s)→C

GREYUIT [131]

Answer:

$m=8.79kg$

Explanation:

First of all we need to calculate the heat that the water in the cooler is able to release:

$Q=\rho * V*Cp*\Delta T$

Where:

Cp is the mass heat capacity of water
V is the volume
$\rho$ is the density

$Q=1 g/cm^3 *15000 cm^3*4.184 \frac{J}{g*^{\circ}C}*(10-90)^{\circ}C$

$Q=-5020800 J=-5020.8 kJ$

To calculate the mass of CO2 that sublimes:

$-Q=\Delta H_{sub}*m$

Knowing that the enthalpy of sublimation for the CO2 is: $\Delta H_{sub}=571 kJ/kg$

$5020.8 kJ=571 kJ/kg*m$

$m=\frac{5020.8 kJ}{571 kJ/kg}=8.79kg$

6 0

3 years ago

Determine if the equation is endothermic or exothermic examples

Fittoniya [83]

There are a couple of ways todetermine if a reaction is exothermic or endothermic. Endothermic meaning that heat is added to the reaction to make the reactants interact and exothermic meaning heat is released during the reaction between the two reactants.

In endothermic reactions you can find a triangle above the arrow.

6 0

3 years ago

The balloon is removed from the freezer and returned to its initial conditions. It is then heated to a tempatuew of 2T at a pres

slavikrds [6]

Answer:

answer: It does not change

Explanation:

7 0

3 years ago

A student walks 2 km in 30 min what is the students average In km/h

horrorfan [7]

I think the answer the students average is 15 km?