CHEMISTRY HIGH SCHOOL

Which of the following is a homogeneous mixture?a.sugar dissolved in water
b.oxygen and nitrogen gases in the air
c.oil and vinegar salad dressing
d.a silver mercury amalgam used to fill a tooth cavity

Answers

Answer 1
Answer: a, b and d if you don't count the tooth.

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The world's record in the 100 m dash is 9.69 seconds and in the 100 yard dash is 9.21 seconds. A) find the speed in mi/h of the runner who set the record of 9.69 seconds. B) find the speed in mi/h of the runner who set the record of 9.21 seconds.
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Food is shipped thousands of miles throughout our country using various types of transportation such as trucks, planes, and boats. Food availability would be most affected by a shortage in which of the following energy sources? Coal Natural gas Petroleum Water power

Answers

The correct answer for this would be the third option: PETROLEUM. So when food is  shipped thousands of miles throughout our country using various types of transportation such as trucks, planes, and boats, food availability would be most affected by a shortage of PETROLEUM. Petroleum is the energy that is used to operate trucks, planes and boats. Hope this answers the question.

Answer: Petroleum

Explanation:

Petroleum is a fossil fuel. It is also called as crude oil. It is a yellowish black liquid that can be found beneath the earth crust. It is a highly combustible fuel and generates lot of heat energy necessary for running the vehicle. It is the most commonly used fuel for shipping, and road transportation of goods and services. It helps the vehicles to run for long and covering the large distance.

The food availability would be affected by the shortage in absence of petroleum.

If 7.84 × 107 J of energy is released from a fusion reaction, what amount of mass in kilograms would be lost? Recall that c = 3 × 108 m/s.

Answers

the correct answer would be 8.71 × 10–10

Which of the following is a single replacement reaction?2Al + 6H2O yields 2Al(OH)3 + 3H2
AgNO3 + NaCl yields AgCl + NaNO3
Fe2O3 + 3H2O yields 2Fe(OH)3
CH4 + 2O2 yields CO2 + 2H2O

Answers

2Al +H2O yield 2Al(OH)3 + 3H2 (answer A)

is an example of single replacement reaction

This is because single replacement reaction involve an element reacting with a compound and take place of another element in that compound. Al an element react with to yield Al(OH)3 and H2. Al take place of H + therefore the reaction above is example of single replacement.
The answer is the first one. 2Al+6H2O yields 2Al(OH)3H2

How many atoms are in 3.75 moles of Phosphorus? A) 136 atoms
B) 35 atoms
C) 6.23x10^-24 atoms
D) 2.26x10^24 atoms

Answers

there are 6.022145E+23 atom per one mole.

What is made up of biotic and abiotic features

Answers

biotic - animals anything tht is living abiotic anything tht is non-living
Biotic-living organisms within an ecosystem. 
Abiotic-non-living things.

A body moving with a velocity of 20 m/s begins to accelerate at 3 m/s2. How far does the body move in 5 seconds?A. 137.5 m
B. 196 m
C. 260 m
D. 162.5 m

Answers

The distance covered will be:

d = v_0\cdot t + (1)/(2)a\cdot t^2 = 20(m)/(s)\cdot 5\ s + (5)/(2)(m)/(s^2)\cdot 5^2\ s^2 = \bf 162,5\ m

The correct answer is D).

The Correct answer to this question for Penn Foster Students is: 137.5 m
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