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Question 2 Multiple Choice Worth 1 points [ They form potassium chloride KCl and water H2O. What type of reaction is this? How do you know that this is a chemical change? Chemical bonds in the water molecule are broken. There is a phase change from liquid to gas. Electrical current always causes a chemical change. It is a single replacement reaction. Question 8 Multiple Choice Worth 1 points [ What forms of heat transfer are acting to transfer heat from the fire to your skin?

Exothermic reactions often produce light. Conduction cannot occur in a liquid. Gases often rise from the surface of a reaction. Convection currents form during chemical reactions. Question 10 Multiple Choice Worth 1 points [ Which of the following must be true of photosynthesis? The reaction can take place only if energy is added. The reactants are oxidized. Cholesterol is a lipid. It is a waxy, fat-like substance that is produced by the liver and can be obtained through eating certain foods.

Compare and contrast spiders and lizards. Similarities Spiders and lizards can live anywhere on the planet. The only exception is mountaintops or an extremely cold region such as Antarctica. They mostly prefer habitats with dense Second, be sure to check the hoof itself for What is the unifying force in a beehive? The queen bee is understood to be the most important, unifying creature in a bee hive. She is usually the only mated bee in the hive and is the mother to most, if not all, bees within the hive.

Biology is defined as either the science of life or the study of living things. There are many disciplines which fall under the umbrella of biology. To name a few, these include botany the study What are four common methods used to discover exoplanets? There are many ways that exoplanets are discovered. Pulsar timing is a process in which radio waves emitted by pulsars are timed. Shifts in the timing indicate the presence of an exoplanet.

In which state of matter does diffusion occur the fastest?? Diffusion happens in all states of matter, from solid to liquid to gas. Diffusion occurs the quickest when matter is in its gaseous state. Diffusion is, quite simply, the movement of molecules from What is the role of intestinal juice in digestion?

Intestinal juice is a part of the larger digestive system. It is an integral part of digestion and is excreted into the small and large intestines when the body detects that there is food in the How do the skeletal and circulatory system work together? Our body is made up of eleven systems that work together to help our bodies function in harmony. These systems, often called organ systems, are made up of various organs within our bodies.

Which part of the flower performs a similiar role to the testes in the male reproductive system? The part of a flower that imitates the human male reproductive system is called the stamen, and the part that imitates the testes are the microspores on the anther. The stamen has two main parts Why are cell membranes said to have selective permeability? Selective permeability refers to the fact that membranes allow only certain substances to pass through and gain entry into the cell.

Other materials are not allowed access to the cell, and they are Which particle is most important to the identity of an atom? There are three main types of particles in atoms: Protons and neutrons are collectively referred to as "nucleons" because they both reside in the nucleus of the One of the earliest atomic models was suggested by John Dalton.

Which statement best reflects his The correct answer choice is d: Dalton proposed that atoms are indivisible and indestructible What physical property of a cork allows it to float on water? Density is the physical property that allows a cork to float on water. Briefly, cork is less dense than the water.

In other words, it is lighter than water and, hence, it floats on the water What role should science play in environmental decision-making? Scientists are the experts on environmental issues. Often times, environmental problems are brought into the political arena from the science community. However, the information provided by the Calculate the entropy change for the reaction: The entropy change for the given reaction, involving the manufacturing of ammonia from nitrogen and hydrogen, can be calculated as the difference between the entropy of the products and reactants Is fire a solid, liquid, or gas?

In the 18th century, Charles Coulomb uncovered the secrets of electrostatic force between charged particles. Find out what gives electric charges the potential to do work and how we measure that potential with something called voltage. We use them every day, but no one really gives them much thought. What are we talking about? Why, voltage sources, of course!

Batteries and generators are two of the most common sources of voltage that power our daily lives. Like a river current is the flow of water molecules, electrical current is the flow of charged particles. Did you know that electrical current is affected by the voltage and resistance in a circuit?

Electric circuits can be configured to power several loads, such as light bulbs, in series or in parallel. Power is a word we use all the time, but do you really know what it means? Did you know… We have over college courses that prepare you to earn credit by exam that is accepted by over 1, colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

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Explore over 4, video courses. Find a degree that fits your goals. Try it risk-free for 30 days. This homework help resource uses simple and fun videos that are about five minutes long. Physical Science - Electricity: Test your knowledge with a question chapter practice test.

View all practice tests in this course. Electric Charge and Force: Variables Affecting the Force Between Two Charged Particles In the 18th century, Charles Coulomb uncovered the secrets of electrostatic force between charged particles. Energy Conversion and Examples We use them every day, but no one really gives them much thought. What is Electric Current?

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May 23,  · A person sitting under a coconut palm is struck by a 2kg coconut that fell from a height of 20m. (a) find the kinetic energy of the coconut when it reaches the person. (b) find the average force exerted by the coconut if its impact is absorbed over a distance of 5cm. (c) what is the force in pounds? is it a good idea to sit under a coconut palm?Status: Resolved.

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Nov 28,  · 1. All chemical reactions fit into one of the five major categories of chemical reactions. true or false 2. When a chemical reaction occurs, the atoms involved in the change: 3. A balanced chemical equation should have _____ of the lowest possible whole numbers. 4. In the chemical equation, C3H4 + O2 --> C5H2O6, what are the reactants?Status: Resolved. Need even more information? Don't forget to search the reference sources of Infoplease for answers to your homework questions.

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assignments help australia Physical Science Homework Help Answers help on a essay for free reach paper. How help deal with physical science homework Develop an interest in the subject Answers you do not have an interest in the subject, you homework never be able to score well. Take notes during the science The physical is the most important thing to help you attempt your homework.