How to minimize the heat loss in a chemical reaction

Answers

Answer 1

Answer: The usual answer (and correct) is to improve on the insulation, for example by covering the calorimeter, and using two cups, one inside the other.

Further improvements can be made
1) carrying out the experiment over as short a period of time as possible. reason; any calorimeter will loose heat, but the shorter the time allowed, the less heat will be lost.
2) Use a larger calorimeter, with greater volume of solution. reason; the greater the solvent mass requires more energy to obtain the same change in temperature. You get a smaller temp change for the same reaction, so less losses to the surroundings.
3) calibrate your calorimeter heat the same volume of pure water to a similar temperature as that which the reaction produces. Then determine the rate of heat loss over a period of time, say take temp every minute for 30 minutes, and plot a graph. This will give you a calibration curve that you can use to apply a correction for your calorimeter.

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Visual processing begins in the primary visual cortex, located in the the __________ lobe.
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Why weight bearing activities build better bones

Answers

Weight bearing activities build better bones because bone cells respond by creating more bone tissue. The more the bone tissues are the stronger it builds up. This bone-building process is also called as osteogenesis. Only the bones involved on the exercise can generate new bone tissue so, it is really better to have a weight exercise that involves almost all of the bones.

The________ immune system consists of cellular immunity and humoral immunity.Choices:
Adaptive
Innate

Answers

I believe it would be Adaptive.

Final answer:

The adaptive immune system consists of cellular and humoral immunity, involving an effective, specialized response to specific pathogens, utilizing memory function for rapid response in future encounters. It works more effectively than the innate immunity.

Explanation:

The adaptive immune system consists of cellular immunity and humoral immunity. Cellular immunity involves the direct attack of infected cells by T cells. The T cells recognize and respond to the antigens present on the infected cells and destroy them. This process is highly specialized, reliable, and tailor-made to deal with specific pathogens.

The second part of the adaptive immune system, humoral immunity, is mainly managed by B cells. B cells work by producing antibodies in response to an antigen. These antibodies identify and neutralize threats, such as pathogenic bacteria and viruses. When the threat is neutralized, the adaptive immune system also retains a memory of this pathogen, enabling a rapid and effective response upon future encounters with the same threat.

So, in summary, it is the adaptive immune system that includes both cellular and humoral immunity, a highly specialized two-pronged response with an excellent memory function, which is more effective than the innate immune response in dealing with the vast variety of potential threats.

Learn more about Adaptive immune system here:

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Protein is essential to the overall health of the body because it A. helps "bulk up" muscles.
B. gives the body collagen, which protects the organs.
C. keeps hair and nails healthy.
D. sustains life and keeps body systems in good repair.

Answers

The answer is D. A is the funny answer, not essential to the body. It allows the repair of muscles and other parts of the body.

Why do most people begin a diet?a. to lower their blood pressure
b. to raise their cholesterol
c. to lose weight
d. to avoid disease

Answers

For most people, dieting is a way to lose weight, so it is often undertaken by those who are overweight or obese and need to reduce their body weight to stay healthy. Therefore, lowering blood pressure and avoiding disease are often second hand results of losing weight by dieting. Dieting rarely results in raised cholesterol.

Answer:

answer is C

Explanation:

An object with a mass of 90 grams, moving at a constant velocity of 6 meters per second, has __________.

Answers

it has a 0.54N weight or force of weight

To solve this given word problem we can first identify the given and the apt formula to use in this phenomenon: Given: Force = 4, 500 N = 4, 500 kg-m/s^2 Acceleration = 5 m/s^2
Formula: f=ma
Derivation: m = f/a
Solution:
1.    M = f/a
2.    M = 4,500 kg-m/s^2 / 5 m/s^2
3.    M = 900 kg

Hence, the object’s mass is 900 kg.

If you're confused, its A.

The waist-to-hip ratio is different for men and women.
a. True
b. False

Answers

The answer is true because there is no way it can be the same. Females, give birth so their hips are wider. You get what I mean? Well, I hope this helps :)
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For adults age 19–50, Dietary Guidelines recommend consuming at least _______ of vegetables and fruits daily.A. 3 cups B. 1 to 2 cups C. 4 to 5 cups D. ½ cup