The unit used to measure force is Newton. Therefore, option (A) is correct.
What is the International System of Units?The S.I. units can be defined as the modern version of the metric system and the globally used system of measurement for the different quantities which is established and managed by the Conference on Weights and Measures.
S.I. units system can be demonstrated as a system of measurement used in most of the countries in the world employed in mathematics, technology, industry, science, and commerce.
The S.I. possesses a coherent system of units initiated with seven base units. The second (s) is the unit of time), mole (mol) is the amount of substance, Kilogram (kg) is the unit of mass, meter (m) is length), kelvin (K) is the unit of temperature, ampere (A) is the unit of electric current, and candela (cd) is the luminous intensity.
The force is defined as the mass times of acceleration the unit of mass is Kg and acceleration is m/s². So the unit of the force is Kg.m/s² but we use Newton to measure the force.
Therefore, force is measured in the units of Newton.
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Which of the following increases the rate of a chemical reaction?
A. Increasing the number of different elements involved in the reaction
B. Increasing the temperature of the materials reacting
C. Decreasing the concentration of the materials reacting
D. Decreasing the temperature of the materials reacting
Increasing the temperature of the materials involved in a chemical reaction is the factor that speeds up the reaction rate.
The correct option that increases the rate of a chemical reaction is B. Increasing the temperature of the materials reacting. When the temperature of a chemical reaction is raised, the particles move faster, which leads to a higher frequency of collisions, and more importantly, these collisions are more likely to overcome the activation energy barrier, forming products at a faster rate. This results in an increased rate of the chemical reaction.
In contrast, increasing the number of different elements (option A), decreasing the concentration (option C), or decreasing the temperature (option D) would not necessarily increase the rate of a reaction and can even slow it down.
what effect would over logging of trees have on the amount of carbon dioxide in the atmosphere
When considering different hypotheses, usually the ____ one which can account for the ____ is the correct one. |
| \/
\/ newest
planetary system simplest
information most complicated
orbitals longest
theory
I know its not chemistry but theres no science option
Answer:
Simplest, Information.
Explanation:
Imagine an experiment in which hydrogen peroxide decomposes to form water and oxygen gas. hydrogen peroxide>water+oxygen gas which of the following processes could be used to show that this reaction obeys the law of conservation of matter
A. show that the mass of water produced is more than the mass of oxygen produced
B. show that the mass of water produced plus the mass of oxygen produced are together equal to the original mass of hydrogen peroxide
C. there is no way to show that the law of conservation is supported.
2. When an acid and a base react, they form new substances compare the new products with the original substances. original substance(acid+base) > new substances
A. the chemical and physical properties of the new substances are different from the properties of the original substances
B.the chemical and physical properties of the new substance are the same as the properties of the original substances
C. The chemical properties of the new substances are the same but the physical properties are different
D. the physical properties of the new substances are the same but the chemical properties are different.
Which of these statements is not true about chemical reaction rates?
A. The reaction rates can change.
B. The reaction rates can increase.
C. The reaction rates can decrease.
D. The reaction rates are always constant.
how many grams are in 4.5 moles of sodium fluoride, NaF
How many grams are in 15.3 moles of gold?
Marble statues and buildings weather more quickly today than when first constructed. Explain how the pH of water plays a role in this process.
Please answer it in at least a few sentences!! Thank you!
as magma cools, the first minerals to ______ are rich in iron, calcium, and magnesium.
Answer:
crystallize
Explanation:
Magma is a mixture of liquid rock particles, dissolved gases and crystals of different metals. They are rich in calcium, iron, magnesium, potassium and sodium. Molten magma causes volcanic eruption and as a result all these elements are expelled out of the earth's inner core. Temperature of the magmas are very high ranging from 650 degree to 1250 degree celcius. They come out in molten form and slowly crystallizes and solidifies as rocks which is very rich in minerals like iron, calcium, magnesium, sodium etc.
Thus, as magma cools, the first minerals to crystallize are rich in iron, calcium, and magnesium.
Two states of matter are described below. State A: Cannot be compressed and retains its shape State B: Highly compressible Which combination of the state and a substance in that state is correct?
The correct combination is State A: Cannot be compressed and retains its shape, which describes the state of matter known as a solid.
Explanation:The combination of the state and a substance that is correctly described is State A: Cannot be compressed and retains its shape. This describes the state of matter known as a solid. Solids have a fixed shape and volume, and the particles are tightly packed together, which makes them unable to be compressed. Examples of solids include rocks, metals, and wood.
a pure substance that contains only one atom is called a(n) _____.
A: Element
B: Compound
C: Mixture
D: Precipitate
Answer:
element
Explanation:
-compounds have two or more types of atom
-mixture can be easily separated without the use of a chemical reaction
-i dont know what a precipitate is
Answer:
element
Explanation:
boiling point density conductivity color These may all be classified as the ______________ of a substance.
Boiling point density conductivity color These may all be classified as the. of a substance. - 6357722.
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Is mass conserved when 50 g of sugar undergoes a physical change? Use complete sentences to support your answer by explaining how this can be demonstrated.
Answer:
1. When 50 g of sugar undergoes a physical change, say for example dissolving or melting, the amount of sugar in the solution or melted form will also be 50 grams. This shows that the mass before and after the change was the same, in accordance to the law of conservation of mass.
Which is an example of an element? A) salt (NaCl) B) water (H20) C) silver (Ag) D) electron (e-)
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Two organisms are in the same phylum but not the same class. Another pair of organisms are in the same genus. Which pair has more in common? Why?
how far below sea level is the peak of the ridge?
Final answer:
The peak's elevation below sea level is determined by its height in negative meters or feet compared to mean sea level. Historical changes, like those during the Last Glacial Maximum, have significantly affected sea levels and the geographical landscape.
Explanation:
The student's question appears to be asking about the elevation of a specific peak within a mountain ridge in relation to sea level. This likely references the concept of topographic elevation and sea level changes. To answer this question factually, we would need more specific information about the particular peak in question, including its elevation. However, generally speaking, the elevation of a point below sea level is measured as a negative number representing the distance below the standard zero point, which is the mean sea level. A notable historical fact that may help in contextual aspects of this question is that during the Last Glacial Maximum, mean sea levels were around 110 to 120 meters (361 to 394 ft) lower than they are today, meaning the coastal landscape was vastly different and what is now submerged was once dry land.
To further illustrate how elevation works, Earth's relief varies greatly from the highest point at the top of Mt. Everest to the depths of the Mariana Trench. When teaching about such elevations in a classroom setting, it's essential to understand the differences in altitude, which is the height of a point above sea level, and depth, which is the distance below sea level. Lastly, due to factors such as glacial melting and geological uplift, sea levels have changed over time. An example of this is the eustatic sea level rise of approximately 125 meters since the last deglaciation.
The atoms, molecules, or compounds present at the start of a chemical reaction that participate in the reaction.
Which part of a chemical reaction does this define?
A. products
B. reactants
C. subscripts
D. coefficients
Which is a chemical reaction?
A. solid chocolate melting into liquid chocolate
B. a peanut shell cracking open into two halves
C. water vapor condensing into liquid water on a window
D. hydrogen gas and oxygen gas synthesizing into liquid water
Answer:
For 1: The chemical species present at the start of the chemical reaction are reactants.
For 2: Hydrogen gas and oxygen gas synthesizing into liquid water is a chemical reaction.
Explanation:
For 1:In a chemical equation, the chemical species are termed as reactants or products.
Reactants are defined as the species which react in the reaction and are written on the left side of the reaction arrow. They are present at the start of the reaction.
Products are defined as the species which are produced in the reaction and are written on the right side of the reaction arrow. They are present at the end of the reaction.
[tex]\text{Reactants}\rightarrow \text{Products}[/tex]
Hence, the chemical species present at the start of the chemical reaction are reactants.
For 2:Physical change is defined as the change in which change in shape and size takes place. The chemical composition of a substance remains the same. No new substance is formed during this.
Chemical change is defined as the change in which change in chemical composition takes place. A new substance is formed in this.
For the given options:
Option A: A solid chocolate is melting into liquid chocolate by providing heat. The shape of the chocolate is changing. So, its a physical change.
Option B: When a peanut shell is cracked up, the size of the peanut shell is changed. So, it is a physical change.
Option C: When water vapor is cooled down to form liquid water, no new substance is getting formed. So, it is a physical change.
Option D: When hydrogen gas reacts with oxygen gas, it leads to the formation of water. As, new substance is getting formed. So, it is a chemical change.
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
Hence, hydrogen gas and oxygen gas synthesizing into liquid water is a chemical reaction.
How/why does the density of an object change when heated?
In your own words, give a summary of the history of the atom. Make sure to use names of models and the scientists associated with each. Make a different paragraph for each model/scientist. (ADV is a minimum of 5 paragraphs) Notice that the Atomic Theory has changed over time as scientists have added knowledge through experimentation and use of advanced instruments. Be sure to include the following: Plum pudding model orbitals electrons gold foil experiment Bohr's model protons nuetrons nucleus
what is a frame reference
Answer:
i think a measurements used when inertia is present
Explanation:
can Someone please do this for me please please
The change from liquid to solid, or the reverse of melting, is called?
Which substance would most behave as an ideal gas at STP
A. N2
B. H2O
C. CH3OH
D. HF
What type of galaxy do we live in
whats the electron configuration for an atom that has 13 electrons
How many valence electrons does Iron (Fe) have? How do you know?
Iron (Fe) has 8 valence electrons, as determined by its position in Group 8 (VIII) of the periodic table, which is a characteristic shared by all elements in this group.
Iron (Fe) has 8 valence electrons.
To determine the number of valence electrons for an element, you can use the periodic table. In the case of iron, it is located in Group 8 (VIII) of the periodic table, also known as Group 8 or Group VIII. The group number indicates the number of valence electrons for elements in that group.
Iron, with its atomic number 26, falls within this group. Elements in Group 8 have 8 valence electrons, as this is the most stable configuration for the outermost electron shell. In the case of iron, it has the electron configuration of 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶. The 3d subshell contains 6 electrons, and the 4s subshell contains 2 electrons. The sum of these two subshells gives a total of 8 valence electrons.
Valence electrons are important in understanding an element's chemical behavior, as they are involved in chemical bonding and reactions. In the case of iron, its 8 valence electrons play a crucial role in its ability to form chemical bonds and participate in various chemical reactions.
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According to your results, rank the household products that you have used according to the strength of acidity?
how does an element's period number relate to the number of the energy level of its valance electrons
The period number is the same number as the highest energy level, for the atoms on that row which is also the energy level that holds valance electrons.
What is an electron?
An electron is defined as a subatomic particle which is charged negatively either bound to an atom or not it means free. The nucleus of an atom is made up of electron, proton and neutron. The electron is a basic particle and electron is not made of anything.
The nature of electron is free it means they are present freely in nature and consist of an atom.The main function of electron is that they play the role of negatively- charged component of an atom.
The electrons are primary source of current conducting and electrons number as well as atomic number of an element is always same or equal. There is no size of electron but the mass of electron is 9×10^-31.
Therefore,the period number is the same number as the highest energy level, for the atoms on that row which is also the energy level that holds valance electrons.
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During an investigation, similar effervescent tablets were dropped into a beaker containing cold water and a beaker containing tap water. The table below shows an incomplete record of the investigation. Investigation Results Beaker Time Taken for the Tablet to Dissolve (seconds) Cold Water (50 ml) 68 Tap Water (50 ml) ?
The answer would be B. Less than 68 seconds as rate of reaction is higher for tap water because when you add a solute to cold water, it does not dissolve in the solvent as to putting the solute in room temperature or warm water.
Less than 68 seconds as rate of reaction is higher for tap water because a solute does not dissolve in cold water as it would in warm or room temperature water.
What is rate of reaction?Rate of reaction is defined as how quickly reactants transform into products.
It can also be defined as the rate of a chemical reaction, calculated as being proportional to the rise in product concentration per unit time and the fall in reactant concentration per unit time.
The rate of reaction is essentially how quickly the product is created and how quickly the reactant is depleted.
The rate law and collision theory both state that reaction rate increases with concentration. Collisions happen more frequently as reactant concentration rises.
Thus, less than 68 seconds as rate of reaction is higher for tap water because a solute does not dissolve in cold water as it would in warm or room temperature water.
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Your question is incomplete, but probably your complete question was
During an investigation, similar effervescent tablets were dropped into a beaker containing cold water and a beaker containing tap water. The table below shows an incomplete record of the investigation.
(INVESTIGATION CHART ON PINNED SCREENSHOT)
Which statement best explains the time taken for the tablet to dissolve in tap water? (5 points)
a
Less than 68 seconds as the rate of reaction is higher for cold water
b
Less than 68 seconds as the rate of reaction is higher for tap water
c
More than 68 seconds as the rate of reaction is lower for cold water
d
More than 68 seconds as the rate of reaction is lower for tap water
During an experiment, if you purposely change the temperature to test a hypothesis, the temperature is called the _____ variable. A. manipulated B. responding C. experimental D. dependent