What is light? How fast does it travel in a vacuum?

Verify Points A, B, C, and D all lie on the same line. Are the points also coplanar? Which postulate or theorem can be used to justify your response?

Carbon dioxide enters a converging–diverging nozzle at 60 m/s, $310^{\circ} \mathrm{C}$, and 300 kPa, and it leaves the nozzle at a supersonic velocity. The velocity of carbon dioxide at the throat of the nozzle is (a) 125 m/s(b) 225 m/s(c) 312 m/s(d) 353 m/s(e) 377 m/s

Evaporating sweat cools the body because evaporation is an endothermic process: $\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{H}_{2} \mathrm{O}(g)$ $\Delta H _{\mathrm{rxn}}^{\mathrm{o}}=+44.01 \mathrm{kJ}$ Estimate the mass of water that must evaporate from the skin to cool the body by 0.50$^{\circ} \mathrm{C}$. Assume a body mass of 95 kg and assume that the specific heat capacity of the body is $4.0 \mathrm{J} / \mathrm{g} \cdot^{\circ} \mathrm{C}$

When waves of equal amplitude from two sources are in phase when they interact, it is called?

(a) Destructive interference.

(b) Constructive interference.

(c) Diffraction.

(d) None of these.

The number of cycles that pass through a stationary point in a given period of time is called as?

a. wavelength

b. area

c. frequency

d. amplitude

e. median

When waves of equal amplitude from two sources are out of phase when they interact, what is it called?

The distance between adjacent wave crests is called:

A) wavelength

B) frequency

C) trough

D) none of the above

Addition principle

Determine the mass of $CO_2$ produced by burning enough of each fuel to produce $1.00 \times 10^{2}$ kJ of heat. Which fuel contributes least to global warming per kJ of heat produced? a. $\mathrm{CH}_{4}(g)+2 \mathrm{O}_{2}(g) \longrightarrow \mathrm{CO}_{2}(g)+2 \mathrm{H}_{2} \mathrm{O}(g)$ $\Delta H_{\mathrm{rxn}}^{\mathrm{o}}=-802.3 \mathrm{k} \mathrm{J}$ b. $\mathrm{C}_{3} \mathrm{H}_{8}(g)+5 \mathrm{O}_{2}(g) \longrightarrow 3 \mathrm{CO}_{2}(g)+4 \mathrm{H}_{2} \mathrm{O}(g)$ $\Delta H_{\mathrm{rxn}}^{\mathrm{o}}=-2043 \mathrm{k} \mathrm{J}$, c. $\mathrm{C}_{8} \mathrm{H}_{18}(l)+25/_{2} \mathrm{O}_{2}(g) \longrightarrow 8 \mathrm{CO}_{2}(g)+9 \mathrm{H}_{2} \mathrm{O}(g)$ $\Delta H_{\mathrm{rxn}}^{\mathrm{o}}=-5074.1 \mathrm{kJ}$

Zinc metal reacts with hydrochloric acid according to the balanced equation :$\mathrm{Zn}(s)+2 \mathrm{HCl}(a q) \longrightarrow \mathrm{ZnCl}_{2}(a q)+\mathrm{H}_{2}(g)$ When 0.103 g of Zn (s) is combin ed with enough HCI to make 50.0 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 22.5 $^{\circ} \mathrm{C}$ to 23.7 $^{\circ} \mathrm{C}$. Find $\Delta H_{\mathrm{rxn}}$ for this reaction as written. (Use 1.0 g/ mL for the density of the solution and 4.18 $\mathrm{J} / \mathrm{g} \cdot^{\circ} \mathrm{C}$ as the specific heat capacity.)

When 1 mol of a fuel burns at constant pressure, it produces 3452 kJ of heat and does 11 kJ of work. What are $\Delta E$ and $\Delta H$ for the combustion of the fuel?

Calculate the frequency of the red light emitted by a Neon sign with a wavelength of 659.9 nm.

Which of the following occurs as the wavelength of a photon increases:

A) The frequency increases.

B) The energy decreases.

C) Planck's constant decreases.

D) The speed decreases.

E) None of the above occurs as the wavelength of a photon increases.