TRUE FALSE 1. All chemical reactions involve energy. TRUE FALSE 2. An important endothermic reaction is photosynthesis.
TRUE FALSE 3. Combustion is an example of an endothermic reaction.
TRUE FALSE 4. There is no overall change in the amount of energy in chemical reactions.
TRUE FALSE 5. Energy is absorbed in exothermic reactions.
TRUE FALSE 6. An increase in temperature is a sign of an exothermic reaction.
TRUE FALSE 7. Products have less stored chemical energy than reactants in an endothermic reaction.
TRUE FALSE 8. Catalysts in living things are called enzymes.
TRUE FALSE 9. Endergonic reactions are reactions that release energy.
TRUE FALSE 10. Plants using sunlight to grow is an endergonic reaction.
TRUE FALSE 11. The difference between exergonic and exothermic is that endergonic is only the release of light and exothermic is only the release of heat.

Can someone help me ASAP

question1

1,000 tons

question2

3: 8

question 3

store d

step-by-step explanation:

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

powerful computers now, not then

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.