PHYSICS HIGH SCHOOL

Based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released):Endothermic
B2+C2-->2BC
A+BC-->AB+C

Exothermic
AB+C-->AC+B
A2+C2-->2AC
A2+B2-->2AB

Answers

Answer 1
Answer: Based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released):
Endothermic 
B2+C2-->2BC 
A2+C2-->2AC 
A2+B2-->2AB

Exothermic 
AB+C-->AC+B 
A+BC-->AB+C 
Answer 2
Answer:

Answer:

The correct answer is

Endothermic:

AB+C-->AC+B

A2+C2-->2AC

B2+C2-->2BC

Exothermic:

A+BC-->AB+C

A2+B2-->2AB

Explanation:

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Choose the behavior that is not appropriate in a lab setting.running between lab stations

using common sense at all times

keeping the lab station clear

wearing goggles when using chemicals

Answers

Answer:

runningbetweenthelabs

Explanation:

as it is dangerous to run die to incidents like spilling chemicals, injuring yourself or someone else and also possible death if the chemical is dangerous.

You are driving a 4000 kg pickup truck on a cold winter day when the coefficient of static friction for tires on the icy road is only 0.13. What is fastest you can drive around a bend whose radius of curvature is 50 m?

Answers

Answer:

8 m/s

Explanation:

m = mass of the pickup truck = 4000 kg

\mu_(s) = Coefficient of static friction between tires and ice road = 0.13

r = Radius of curvature = 50 m

The frictional force between tires and ice road provides the necessary centripetal force to move in circle. hence

centripetal force = frictional force

(mv^(2))/(r) = \mu_(s) mg\n(v^(2))/(r) = \mu_(s) g\n(v^(2))/(50) = (0.13) (9.8)\nv^(2) = (0.13) (9.8) (50)\nv = 8 ms^(-1)

All contraceptives prevent STIs true or false

Answers

False. Not all contraceptives prevent STIs.

Contraceptives are items used or taken to prevent conception. These are birth control pill, patch, ring, IUD, birth control shots, and condoms. Among these contraceptives, condoms are the only type of birth control that prevents STIs or Sexually Transmitted Infections.

All contraceptives prevent STIs is False because not all them are used in STI prevention.

What is contraceptives about?

Not all contraceptives prevent sexually transmitted infections (STIs). Only condoms, dental dams, and some internal condoms, such as the female condom, can help prevent the transmission of STIs.

Other forms of contraception, such as birth control pills, the patch, the ring, and the shot, do not protect against STIs. This is because they work by preventing ovulation or by thickening the cervical mucus, which makes it more difficult for spermto reach the egg. They do not prevent the transmission of STIs because they do not block the exchange of bodily fluids, which is how STIs are spread.

So, the answer is false.

Find out more on contraceptives here: brainly.com/question/2296833

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The total energy of a 0.050 kg object travelling at 0.70 c is:A) 2.10 × 107 J

B) 3.06 × 107 J

C) 2.46 × 1015 J

D) 6.30 × 1015 J

E) 8.82 × 1015 J

Answers

Answer:

1.1025×10^15Joules

No correct option

Explanation:

The type of energy possessed by the object is kinetic energy. Kinetic energy is the energy due to virtue of an object motion.

KE = 1/2MV² where;

M is the mass of the car = 0.05kg

V is the velocity of the car

Since the car is traveling at 0.7c (c is the speed of light)

speed = 0.7c { 0.7(3×10^8)}

Speed = 2.1×10^8

Substituting this values in the formula given we have;

KE = 1/2×0.05×(2.1×10^8)²

KE = 1.1025×10^15Joules

No correct option.
What is the unit c denotes here

Which type of heating system is often used to heat many buildings from a central location

Answers

Central heating is often used in cold climates to heat private houses and public buildings. Such a system contains boiler, furnace, heat pump to heat water, steam or air, all in a central location such as furnace room in a home or a mechanical room in a large building. The use of water as the heat transfer medium is known as hydronics.

What is the term for the ability to cause change in matter?A. Energy
B. Temperature
C. Acceleration
D. Force

Answers

Answer:

A. Energy

Explanation:

You can change energy from one form to another when you lift your arm or take a step. Energy is used to move matter. In this scenario, the matter would be you.
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