Answer:
Yes
Explanation:
The first step of harvesting is draining the paddy. Next, farmers cut the plants -- with a scythe or sickle if by hand -- and transport them elsewhere to be laid out and dried for two or three days. Rice can be cut by hand or machine. In the developed world, harvesting by hand is still very common.
I need the answers of these
Answer:
Hope this helps :D
Explanation:
Metal: Aluminum and Copper
Non-Metal: Hydrogen and Flourine
Acid: Sulfuric Acid and Phosphoric Acid
Alkali Metals: Hydrogen and Lithium
Compounds: Water and Carbon Dioxide
Elements: Carbon and Oxygen
research some metal ores and what the extracted metals are used for?
A typical example of metal ore is copper which is used for production of electrical wires.
What are metal ores?Metal ores are defined as the metals that are naturally deposited at the earth crust which can serve as a valuable resources for many industries.
The copper is a typical example of a metal ore which is a good conductor of electricity used for production of electrical wires.
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Suppose cobalt-60 undergoes a type of radioactive decay that does not
change the identity of the isotope. which type of decay did the isotope
undergo?
a. delta
b. gamma
c. alpha
d. beta
what did early atomic theory accomplish
Answer:
The concept of the atom (Greek: atomos, "indivisible"), an indivisible particle of matter, goes back to ancient Greece and a man named Democritus, a rival of Aristotle. Democritus held that all matter could be subdivided only until some finite particle was reached.Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties. Dalton based his theory on the law of conservation of mass and the law of constant composition. The first part of his theory states that all matter is made of atoms, which are indivisible.Atomic theory established that all matter is made of tiny particles, a discovery that led to amazing scientific breakthroughs in areas from modern chemistry to nuclear energy.Atomic models are important because, they help us visualize the interior of atoms and molecules, and thereby predicting properties of matter.This atomic model has changed over time. Scientists used the model to make predictions. Sometimes the results of their experiments were a surprise and they did not fit with the existing model. Scientists changed the model so that it could explain the new evidence.Atomic theory originated as a philosophical concept in ancient India and Greece. The word "atom" comes from the ancient Greek word atomos, which means indivisible. According to atomism, matter consists of discrete particles. However, the theory was one of many explanations for matter and wasn't based on empirical dataEverything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed. All atoms of an element are identical. The atoms of different elements vary in size and mass. Compounds are produced through different whole-number combinations of atoms.Dalton's atomic theory suggested that the atom was indivisible and indestructible. But the discovery of two fundamental particles (electrons and protons) inside the atom, led to the failure of this aspect of Daltons atomic theory.
hope this is helpful
Strontium bromide contains only strontium and bromine. What is the formula for this compound?.
[tex]SrBr_{2}[/tex]
Explanation:Chemical formulas are a way to show the elements and the amount of each element present in a compound.
Element Symbol
To write a chemical formula you need to use their chemical symbols. So, we need to find the symbols for strontium and bromide.
Strontium is SrBromine is BrCharges
However, elements do not combine in random ratios. The ratios are based on charges so that all compounds have a neutral charge. Elements will have different subscripts to ensure that compounds have a neutral overall charge. So, to correctly write the formula we need to know the charges Sr and Br have when they became ions.
Sr gains a charge of +2Br gains a charge of -1To cancel the positive 2 out, we must have 2 bromines. That means the final formula for strontium bromide is [tex]SrBr_{2}[/tex]. Now, the compound has a charge of 0.
What happens when a solid is dissolved into a liquid?
Answer:
The solid has broken down into pieces so small that its particles spread all throughout the new mixture.
Why is it important for scientists to use common units such as the metric system?
A. so they can effectively communicate their findings
B. so they can double check their data
C. so they can form similar hypotheses
D. so they can conduct controlled experiments
Answer:
The correct answer is A, or "so they can effectively communicate their findings.
Explanation:
The metric system is the international system of weights and measures, which is used universally in the scientific community. Scientists benefit from the metric system so that they can communicate theories, ideas and most importantly data in a way everyone understands. It is virtually impossible to comprehend any modern, data-rich research in the natural or physical sciences without referring to the metric system and being able to contextualize the numbers and units it includes.
Please brainliest answer
I appreciate it :)
Mary has a sample of permanganate (MnO4-1), in which Manganese has an oxidation state of +7. She wants to reduce the Manganese, which means she needs a substance that will oxidize readily. Which of the following substances should she choose? Explain your reasoning.
Lithium solid (Li)
Silicon solid (Si)
Bromine liquid (Br2)
Forrest spills some acid on the lab floor. He notifies his teacher and begins to look for baking soda to neutralize the acid on the floor.
Who should be notified next?
The other students in the lab should be notified next in this type of scenario.
What is an acid?This is a substance which donates protons and is very corrosive. It also turns blue litmus paper red.
When it was spilled and baking soda was used to neutralize it on the floor , it is best to inform the other students too so as to prevent them from being exposed by mistake thereby reducing risk of injury.
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Why do the carbon atoms with the double bond contain 1 less Hydrogen atoms then
carbon atoms that contains a single bond?
Answer:
The double bond is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons. Carbon dioxide, CO2 Ethene, C2H4 Ethene has a double bond between the two carbon atoms. A more sophisticated view of the bonding in ethene
Explanation:
What is the organic compound?
Answer:
propa-1-nol
Explanation:
easy clapp
What leads to the formation of an ionic bond with Hg2+?
The attraction of an [tex]SO_4^{2-}[/tex] ion leads to the formation of an ionic bond with [tex]Hg^{2+}[/tex]
What is an ionic bond?Ionic bond, also called an electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound.
Since the question asking among all these options:
(a) The attraction of a noble gas
(b) The attraction of a [tex]NH^{4+}[/tex] ion
(c) The attraction of a group 1 element
(d) The attraction of a [tex]SO_4^{2-}[/tex] ion
An ionic bond can be formed after two or more atoms lose or gain electrons to form an ion. Ionic bonds occur between metals, losing electrons, and nonmetals, gaining electrons.
Hence, option D is correct.
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Calculate the temperature change of copper metal that has a mass of 43.2 g and is allowed to absorb 1,345 J of heat. The specific heat capacity of copper is 0.385 J/°c g.
Answer: 80.9 K
Explanation:
[tex]Q=mc \Delta T\\\\1345=(43.2)(0.385) \Delta T\\\\\Delta T=\frac{1345}{(43.2)(0.385)} \approx \boxed{80.9 \text{ K}}[/tex]
2. How many grams of NaCl are required to prepare 0.40 L of a 0.75 M solution?
The mass of a NaCl solution that is required to prepare 0.40 L of a 0.75 M solution is 17.55g. Details about mass can be found below.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles by its molar mass.
However, the number of moles of a solution must be initially calculated by using the following formula:
molarity = no of moles ÷ volume
no of moles = 0.75 × 0.40
no of moles = 0.3 moles
mass of NaCl = 0.3 × 58.5 = 17.55g
Therefore, the mass of a NaCl solution that is required to prepare 0.40 L of a 0.75 M solution is 17.55g.
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The ph of an acidic solution containing a [h] of 7.23 x 10-m
Answer:
the pH of a solution if h+ 1.0 x 10-9 M
5
Explanation:
Concentration (mol/L)[H3O+]pHpOH1 x 10-8861 x 10-9951 x 10-10104
Although xenon and neon are noble gases and therefore do not typically form bonds, weak attractive forces do exist between atoms of these substances. choose the statement that best explains why xenon has a higher boiling point than neon.
a.xenon has a smaller atomic mass than neon
b.xenon has more electron than neon
c.xenon forms more hydrogen bonds than neon
d.xenon is more polar than neon
The statement that best explains why xenon has a higher boiling point than neon is that xenon has more electrons than neon.
What are intermolecular forces?The term intermolecular forces are the force that hold matter together in a particular state such as solid liquid or gas. The more the electrons present, the greater the polarizability and the greater dispersion forces at work.
Thus, the statement that best explains why xenon has a higher boiling point than neon is that xenon has more electrons than neon.
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under what circumstances will a scientific theory be changed or dicarded
Answer:
I think it's..
Explanation:
You can explain more, please.
9. Which practice has been able to save some organisms from extinction?
O cross breeding
O genetic modification
O captive breeding
Orebuilding habitats
The practice that has been able to save some organisms from extinction is cross breeding.
What is cross breeding?Cross breeding is the process of producing separate strains of the same species in order to create new traits.
Living organisms are bound to go extinct when faced by certain unfavorable conditions that cannot be adapted to.
However, the production of resistant strains of the same species of an organism via cross breeding can help prevent them from going extinct.
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Answer:
c
Explanation:
Provide the bond type, molecular structure, and intermolecular forces for h2o and co2. compare and contrast these structures from nacl. using that information, explain why each of these are in a different phase at room temperature.
Intermolecular forces are the forces present between the molecules. In carbon dioxide the intermolecular force is LDM and in water, hydrogen, LDM, and dipole-dipole are present.
What is molecular structure?Molecular structures are the arrangement of the atoms in the three-dimensional phase of the molecule along with their electrons. Water has a bent shape while carbon dioxide has linear shape geometry.
Water is a polar covalent molecule that has hydrogen and dipole-dipole bonding and forces that makes them strong enough to make them liquid at RT. On another hand carbon dioxide is a nonpolar covalent molecule that is gas at room temperature.
Sodium chloride is an ionic compound that has anions and cations in it. As it has high lattice energy it remains solid at room temperature.
Therefore, water, carbon dioxide, and sodium chloride are at different phases at room temperature.
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Question 3 of 10
Which of the following cells would you use to electroplate silver (Ag) on iron
(Fe)?
A. A dry cell
B. A voltaic cell
C. A galvanic cell
D. An electrolytic cell
Answer:
the answer is D
Explanation:
I hope it helps you
D. An electrolytic cell would be used to electroplate silver (Ag) on iron
(Fe).
To electroplate silver (Ag) on iron (Fe), an electrolytic cell would be used. In an electrolytic cell, electrical energy is used to drive a non-spontaneous chemical reaction, such as the deposition of silver onto the iron surface.
In the process of electroplating, the iron object serves as the cathode, where the reduction reaction occurs. The silver ions (Ag⁺) from the electrolyte solution are attracted to the cathode and are reduced to form solid silver (Ag) on the iron surface.
An electrolytic cell consists of two electrodes (anode and cathode) immersed in an electrolyte solution. The anode is typically made of the metal that will be dissolved or oxidized, while the cathode is the surface onto which the desired metal will be plated. In this case, the iron object would act as the cathode.
A dry cell (Option A) is a type of battery that produces electrical energy through a chemical reaction, but it is not suitable for electroplating. A voltaic cell (Option B) and a galvanic cell (Option C) are both types of electrochemical cells that produce electrical energy from spontaneous chemical reactions. However, they are not designed for the purpose of electroplating.
Only an electrolytic cell (Option D) allows the controlled deposition of one metal onto another by using an external power source to drive the desired reaction. Therefore, an electrolytic cell would be the appropriate choice for electroplating silver onto iron.
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Which radioisotope is used to treat thyroid disorders?.
Answer:
I-123 and I-131
Explanation:
Radioactive iodine takes advantage of the fact that thyroid cells and thyroid cancer cells absorb iodine; therefore, it has been used to diagnose or treat various thyroid disorders. Iodine is made into two radioactive isotopes, I-123 and I-131, that are commonly used in patients with thyroid disease.
This download is my science worksheet. It's about different types of energy in a situation, like examples. btw this is 7th grade science
All types of energy can be resumed into two basic types of energy which include kinetic energy and potential energy.
What is kinetic energy?Energy is the ability to perform a given work. Kinetic energy is energy in movement, whereas potential energy is stored energy.
For example, plant photosynthesis makes reference to chemical energy (potential energy), popcorn makes reference to thermal energy, etc.
In conclusion, all types of energy can be resumed into two basic types of energy which include kinetic energy and potential energy.
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Jason and yolanda both drew a simple random sample from a non-normally distributed population of 25,000. Jason’s sample consisted of 0. 24% of the population, while yolanda’s sample consisted of 0. 32% of the population. Whose sample can be used to make inferences about the population?.
Both the samples can be used to make inferences about the population.
What is Non-Normal Distribution?A non-normal distribution is when the data is concentrated on one side with decreasing amount streaming off to the left or right side
It is given in the question that
Total number of population = 25000
% of a sample of Jason = 0.24%
% of the sample of Yolanda's = 0.32%
According to the Jason's Sample
the number of the population is given by
0.24 * 25000 / 100
60
According to the Yolanda's Sample
The number of the population is given by
0.32 * 25000 / 100
80
Both the samples can be used to make inferences about the population.
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What do the Arctic and Antarctic tundra's have in common? Select all that apply.
They experience frigid temperatures and harsh winds.
Humans live among the plants and animals.
They have land mammals that live there.
They have producers that live there.
Answer:
A and D
Explanation:
The two answers to select would be A. (They experience frigid temperatures and harsh winds) and D. They have producers that live there. Using process of elimination, it can't be option B. The Artic has 53 different species of land mammals, however the Antarctic does not. So that leaves you with A and D.
Toothpaste contains Sodium fluoride which is used to prevent tooth decay. How many grams are in 1 mole NaF?
The answer is 42 grams of NaF are there in 1 mole.
What is a mole ?A mole is defined as 6.022 × 10²³ atoms, molecules, ions, or other chemical units.
and the molar mass of a substance is defined as the mass of 1 mole of that substance, expressed in grams per mole.
It is equal to the mass of 6.022 × 10²³ atoms, molecules, or formula units of that substance.
Molar Mass , i.e. mass of 1 mole of NaF is sum of molar mass of Na and F
23 + 19
42 grams
Therefore 42 grams of NaF Sodium-fluoride are there in 1 mole.
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What is the increment of change in a series of straight-chain alkanes?
CH
CH3
CH4
CH2
What is the increment of change in a series of straight-chain alkanes?
CH
CH3
CH4
CH2
Answer:
CH2
A lithium atom has three, protons , three neutrons, and three electrons. What is the overall charge on this atom?
The overall charge on this atom is zero if the lithium atom has three, protons, three neutrons, and three electrons.
What is an atom?The smallest tiny particles of matter which can't be divided further is called atoms.
The lithium atom is always electrically neutral, ie, it has no charge. A proton has a unit positive charge while an electron has a unit negative charge, an atom has an equal number of protons and neutrons and thus it is electrically neutral.
Hence, the overall charge on this atom is zero if the lithium atom has three, protons, three neutrons, and three electrons.
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Which of the following physical changes is not an example of a change in state?
A. rock breaking with a hammer C. corn with ice
B. a (ball looking) object into water D. water filling into a ice cube mold
Answer:
Option
Explanation:
Rock is broken into piece but thestate is normal
(i) Give the two dyes that are mixed to make brown hair dye.
Answer:
green n yellow and white and black and white sq
Which of the following statements is true? Radiation is the transfer of heat between objects which are not touching. An insulator speeds up the vibration of molecules and the transfer of heat. Heat is transfered in solids through conduction. All of the sun's heat is reflected by the Earth's atmosphere.
Answer:
Radiation is the transfer of heat between objects which are not touching. I think
Explanation: