Which of the following is a chemical change Asvab?
ASVAB
| Question | Answer |
|---|---|
| what is the symbol for hydroxx ion | OH- |
| the tympanic membranes are also known as the | ear drums |
| which of the following reactions produce a chemical change | adding salt into hot water |
| choking is presented by the | epiglottis covering the voice box |
What reduces friction sandpaper?
As the sandpaper got to a certain roughness the grains of sand where larger which decreased the over all contact area and reduced the friction. The grains are larger so there will be fewer contact points. One example of this is when you wear cleats on a smooth hard surface you slip all over the place.
What actions produce a chemical change?
Chemical Change. Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties.
Which of the following presents the stages of the water cycle in the correct order?
They are evaporation, condensation, precipitation and collection.
How does sandpaper help in increasing friction?
Question 3: How does sand paper help in increasing friction? Answer: A smooth surface can be made rough with the help of sandpaper. There are more irregularities on a rough surface than on a smooth surface. Thus, sand paper helps in increasing friction; by increasing the roughness of a surface.
What is the friction of sandpaper?
From our experiments, we have concluded that the rougher surfaces have a higher coefficient of friction. The highest was sandpaper which had a average coefficient of friction of 1.666. Next was foil, with an average coefficient of friction 1.665. After that, it was felt with a average coefficient of friction of 1.645.
What happens when a chemical reaction occurs?
chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
What happens during a chemical reaction?
Chemical reactions involve breaking chemical bonds between reactant molecules (particles) and forming new bonds between atoms in product particles (molecules). The number of atoms before and after the chemical change is the same but the number of molecules will change.
Which of the following stages of the water cycle is responsible for getting water into the atmosphere?
Evaporation and transpiration change liquid water into vapor, which ascends into the atmosphere due to rising air currents.
What are the 5 stages of water cycle?
There are five processes at work in the hydrologic cycle: condensation, precipitation, infiltration, runoff, and evapotranspiration. These occur simultaneously and, except for precipitation, continuously.
Does sandpaper have high friction?
Because sandpaper on wood has a higher static friction coefficient than wood on wood and aluminum on wood, it will take a greater force to move the sandpaper on wood than for either of the other two sides. The applied force on the block is approximately equal to the tension force in the string.
Why does friction decrease on reducing the roughness?
Answer. The resistance offered by friction depends directly on the force applied to move the two surfaces (calculated as vertical or normal force) and the roughness of the surfaces. The smoother the surfaces, the less the resistance; the rougher the surface, the more the resistance.
Does sandpaper create friction?
Short answer: finer grade sandpaper has more points of physical contact than rougher grade sandpaper, and each point of contact is a source of friction.
How do scientists represent chemical reactions?
Chemical reactions are represented by Chemical Equations. Chemical equations are balanced to show the same number of atoms of each element on each side. In chemistry there is a Law called the Law of Conservation of Mass that states that matter cannot be created nor destroyed.
Which of the following is the result of a chemical reaction?
products The substances formed as a result of a chemical reaction are called products.
When did scientists discover the water cycle?
The first published thinker to assert that rainfall alone was sufficient for the maintenance of rivers was Bernard Palissy (1580 CE), who is often credited as the "discoverer" of the modern theory of the water cycle.
What are the stages of water cycle?
The water cycle consists of three major processes: evaporation, condensation, and precipitation. Evaporation is the process of a liquid's surface changing to a gas. In the water cycle, liquid water (in the ocean, lakes, or rivers) evaporates and becomes water vapor.
What is water cycle process?
The water cycle shows the continuous movement of water within the Earth and atmosphere. It is a complex system that includes many different processes. Liquid water evaporates into water vapor, condenses to form clouds, and precipitates back to earth in the form of rain and snow.
Does sand reduce friction?
Sand is not used to reduce frriction because it is a not smooth instead it is rough which can increase the friction.
Does surface roughness increase friction?
Making a surface rougher or smoother may not always affect the sliding friction. In addition to this, for certain textures and materials, making a surface smoother reduces friction. But elsewhere, rougher surfaces can actually have less friction.
How does roughness affect friction factor?
The friction factor caused by the internal wall roughness has a greater effect on the friction factor in small pipe sizes. This means that a small diameter pipe will approach its rough condition and have a higher friction factor than a larger diameter pipe of the same material.
What friction is sandpaper?
Table 1
| Material | Coefficient of friction | Recorded Normal Force (N) |
|---|---|---|
| Sandpaper (no. 320) | 0.70 | 0.12 |
| Silk | 0.45 | 0.05 |
| 0.43 | 0.08 |
How do scientists use chemical properties?
Scientists use chemical properties to predict whether a sample will participate in a chemical reaction. Chemical properties can be used to classify compounds and find applications for them.
What happens during the process of chemical reaction?
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
What is the term used to describe a substance that is formed by a chemical reaction?
The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.
How is the water cycle defined in the passage?
The water cycle describes how water evaporates from the surface of the earth, rises into the atmosphere, cools and condenses into rain or snow in clouds, and falls again to the surface as precipitation.
What is the called from which water flows receive water?
Streamflow, or channel runoff, is the flow of water in streams and other channels, and is a major element of the water cycle. It is one component of the movement of water from the land to waterbodies, the other component being surface runoff.
What is transpiration in the water cycle?
Transpiration: The release of water from plant leaves.
Does oil increase friction?
Lubrication reduces friction by replacing solid friction with fluid friction. When one body slides over anoth- er, the force of resistance encoun- tered at the points of contact is known as sliding friction.
How can you best reduce friction between the bottom or feet of furniture and the floor?
Q. How can you best reduce friction between the bottom or feet of furniture and the floor? by smoothing the floor.