CHEMISTRY HIGH SCHOOL

7. what is the density of an object having a mass of 8.0 g and a volume of 25 cm^3? a) 0.32g/cm^3 b) 2.0 g/cm^3 c) 3.1 g/cm^3 d) 200 g/cm^3

Answers

Answer 1
Answer: D = m / V

D = 8.0 g  / 25 cm³

D = 0.32 g/cm³

Answer A

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COLLEGE

A percent composition analysis yields 46.7% nitrogen and 53.3% oxygen. What is the empirical formula for the compound

Answers

Empirical formula is the simplest ratio of whole numbers of components in a compound
calculating for 100 g of compound 
                                                     N                                   O
mass                                          46.7 g                              53.3 g
number of moles                  46.7 g / 14 g/mol                 53.3 g / 16 g/mol 
                                                  = 3.33                               = 3.33
divide by the least number of moles 
                                                3.33/ 3.33 = 1.00              3.33/3.33 = 0
number of atoms 
N - 1
O - 1
therefore empirical formula is NO

Answer:NO

Explanation:

it just is

HIGH SCHOOL

The specific heats and densities of several materials are given below: Material Specific Heat (cal/g·°C) Density (g/cm3)
Brick 0.220 2.0
Concrete 0.270 2.7
Steel 0.118 7
Water 1.00 1.00
Calculate the change in temperature produced by the addition of 1 kcal of heat to 100 g of steel.

A. 84.7°C
B. 37.0°C
C. 1.43°C
D. 1.18°C

Answers

Answer: The change in temperature is 84.7°C

Explanation:

To calculate the change in temperature, we use the equation:

where,

q = heat absorbed = 1 kCal = 1000 Cal    (Conversion factor: 1 kCal = 1000 Cal)

m = mass of steel = 100 g

c = specific heat capacity of steel = 0.118 Cal/g.°C

= change in temperature = ?

Putting values in above equation, we get:

Hence, the change in temperature is 84.7°C

HIGH SCHOOL

The density of benzene at 15 ∘c is 0.8787 g/ml. calculate the mass of 0.1000 l of benzene at this temperature.

Answers

Answer: The mass of benzene is 87.87 grams

Explanation:

To calculate mass of a substance, we use the equation:

We are given:

Density of benzene =

mass of benzene = ?

Volume of benzene = 0.1000L = 100ml    

Putting values in above equation, we get:

Mass of benzene = 87.87g

Hence, the mass of benzene is 87.87 grams

V=0,1 l=100 ml
m=p*V=0,8787*100=87,87g
HIGH SCHOOL

Which of the following results when hydrogen and chlorine chemically bond to form hydrogen chloride?

Answers

When hydrogen and chlorine chemically bond to form hydrogen chloride,energy is being released to the surroundings since this reaction is classified as an exothermic reaction. From the bond energies of the reactants and the product, you will have a result of  -185 kJ of energy. The negative sign indicates that energy is being released.

Answer: a compound

Explanation:

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