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2 years ago

Which statement describes clean air as a natural resource? Select three options.

Chemistry

2 answers:

Mumz [18]2 years ago

6 0

Answer:

a,d,e

Explanation:

its a,d, and e because clean air keeps us alive and other organisms need it to stay alive

SOVA2 [1]2 years ago

5 0

Answer:

B Air pressure is created by the weight of the atmosphere pushing on Earth’s surface

D Denser air is heavier than less dense air.

E Air is less dense at higher altitudes.

Explanation:

Hope this helps you and you pass your test good luck:D

Read more about Pressure

brainly.com/question/25688500

6 0

2 years ago

A car reaches 80 km/hr, then suddenly crashed into a concrete wall. Without a seat

Debora [2.8K]

Answer:

Explanation:

inertia

inertia is the reluctance of an object at rest or moving to change its state of rest or motion

because the car was moving, the dummy moves with the speed of the car..so when the crash happened the dummy continued to move..it was feeling reluctant to come to rest so was moving

4 0

2 years ago

Whats the different between chemical property and chemical change, and physical property and physical change?

storchak [24]

Answer:

I think the answer is A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.

Explanation:

I hope this helps.

6 0

2 years ago

A molecule _____.

Darya [45]

The answer is A my good sir

7 0

3 years ago

Read 2 more answers

Calculate ΔH o rxn for the following reaction, after it is properly balanced with smallest whole-number coefficients: C2H6(g) +

Ne4ueva [31]

Answer:

The enthalpy of the reaction is -2855.622 kilo Joules.

Explanation:

$2C_2H_6(g) + 7O_2(g)\rightarrow 4CO_2(g) + 6H_2O(g)$

We are given:

$\Delta H^o_f_{(C_{2}H_6(g))}= -84.667 kJ/mol$

$\Delta H^o_f_{O_2((g))}= 0 kJ/mol$

$\Delta H^o_f_{CO_2((g))}= -393.5 kJ/mol$

$\Delta H^o_f_{H_2O((g))}= -241.826 kJ/mol$

The equation used to calculate enthalpy of reaction :

$\Delta H^o_{rxn}=\sum [n\times \Delta H^o_f(product)]-\sum [n\times \Delta H^o_f(reactant)]$

The equation for the enthalpy change of the above reaction is:

$\Delta H^o_{rxn}=(4 mol\times \Delta H^o_f_{(CO_2(g))}+6 mol\times \Delta H^o_f_{(H_2O(g)))}-(2 mol\times \Delta G^o_f_{(C_{2}H_6(g))}+7 mol\times \Delta H^o_f_{(O_2(g)))$

Putting values in above equation, we get:

$\Delta H^o_{rxn}=[4 mol\times (-393.5 kJ/mol)+6 mol\times (-241.826 kJ/mol)]-[2 mol\times (-84.667 kJ/mol)+7 mol\times 0 kJ/mol]$

$=-2855.622 kJ$

The enthalpy of the reaction is -2855.622 kilo Joules.

7 0

2 years ago