Answer:
The letter I
Explanation:
H, I, J, K, L, M, N, O, P
Answer:
Ahhhhhhhhhhhhhhh. Me too. I really needed to hear that today.
Explanation:
thanks for that.
Hg2(NO3)2 + Na2CO3 = NaNO3 + HgCO3 balance this
Answer:
Hg(NO3)2 + Na2CO3 --> 2NaNO3 + HgCO3
Is krypton a good or poor conductor of electricity? Why? I
Answer:
No it is not a good conductor
Explanation:
Krypton is classified as a gas and nonmetal. Like many nonmetals and gases, krypton is an insulator, so it is a relatively poor conductor of heat and electricity.
what are some advantages and disadvantages in acid rain management, in crop fields
Answer:
Disadvantages of acid rain:
• Acid rain affects the fresh water ponds and lakes and destroys the aquatic life as some species of fishes are rare and may be extinct
• it can affect the trees particularly those that are high altitude
• It can damage historical monuments and buildings
•soil can be affected and can lead to deaths of good microbes
Advantages of acid rain:
• it makes holes in limestone below ground, which creates caves and places to store groundwater, as well as providing habitat for some species
• But the new study shows that sulfuric in acid may have benefits, limiting global warming by counteracting the natural production of methane gases by microbes in wetland areas.
Explanation:
What structural characteristic do all of the atoms within a group (vertical columns) have in common?
Answer:
The vertical columns (groups) of the periodic table are arranged such that all its elements have the same number of valence electrons. All elements within a certain group thus share similar properties.
hope this helps
Explanation:
Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.
IS N2 (diatomic molecule of nitrogen considered a chemical compound can it be split into two or more simpler substances?
Which of the following is considered quantitative data?
A. Appearance
B. Smell
C. Temperature
Answer:
Temperature
Explanation:
This is because quantitative data include numerical values for example 10 degrees Celsius. However the others are qualitative data because the research can be described but not with numbers like your appearance is very nice.
Hope this helps :P
Answer:
Quantitative data is the type of data whose value is measured in the form of numbers or counts, with a unique numerical value associated with each data set. Also known as numerical data, quantitative data further describes numeric variables (e.g. How many? How often? How much?)
Explanation:
so its temp
Where does the energy come from to break the bonds of water and carbon dioxide molecules?
Answer:
carbohydrates
Explanation:
or carbon dioxide
Calculate the simplest formula of the compounds formed in the
following reactions:
Please just check if I’m correct or wrong
a) 2.3 g of sodium reacting with 8.0 g of bromine
Na=23
Br=80
My answer:
NaBr
I'm sorry I'm not sure of my answer so I am not gonna give you the answe
Which of the following are required for plants to carry out photosynthesis?
Group of answer choices
soil
water
carbon dioxide
oxygen
sunlight
Answer:
Carbon dioxide, water, and sunlight
Explanation:
asap help for brainlist
Which pair of atoms will form a covalent bond?
Question 7 options:
H and O
Li and I
K and Fl
Na and Cl
Answer:
h and o
Explanation:
because both are non metals
Rank the following molecules (1st, 2nd, 3rd, 4th) in the order that they melt.
Sucrose
Iodine
Sodium
Paraffin
There is a picture attached
Sodium chloride has the highest melting point while iodine has the least melting point.
The melting points of solid substances depends on the nature of intermolecular forces that exists in the substance. The stronger the magnitude of intermolecular forces in a substance, the higher its melting point.
The order of melting points of the solids shown in question is as follows;
1st - Sodium chloride2nd - sucrose3rd - paraffin4th - IodineSodium chloride has the highest melting points because it is an ionic substance. Among the molecular sucrose and paraffin, sucrose has a higher melting point than sucrose because it has a greater molar mass. Iodine, a molecular substance has the least molar mass and the least melting point in the list.
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A yellow solid, W is soluble in water. Which method of separation can be used to obtain the solid W from an aqueous solution?
A Neutralisation
B Chromatography
С Distillation
D Crystallisation
Which compound is an acidic oxide?
Aaluminium oxide
carbon dioxide
copper(II) oxide
magnesium oxide
Answer:
Carbon dioxide
Explanation:
Metal oxides are basic and Non metal.oxides are acidic.
Al, Be, Zn,Sn ,Pb oxides are amphoteric so they show both acidic and basic properties.
From the above answers Al, Cu and Mg are metals so their oxides are acidic while Carbon is a non metal.so CO2 is an acidic oxide
The atoms of platinum and silver are identical (true or false)
Answer:
I think it's false but not sure
The atoms of platinum and silver are identical. This statement is false.
What is platinum ?Platinum is a chemical element which is represented by the symbol Pt. Its atomic number is 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal.
The elements silver and platinum have the same properties in terms of ductility, malleability, and conductivity of heat and electricity.Platinum is more ductile than gold, silver or copper.
Both metals silver and platinum appear silver. They have gray undertones, unlike white gold which has a warmer, yellow undertone, instead platinum is much brighter and shinier and silver is a duller, gray appearance.
Thus, The atoms of platinum and silver are identical. This statement is false.
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T or F: Lone pairs around the oxygen atom of a water molecule play no role in determining its molecular geometry?
Answer:
Explanation:
They play a very important part. The geometry is not a straight line. It is an angle over 90 which means that the molecule has the same general shape as a boomerang. The two hydrogens and the 2 lone electron pairs try to get away as far as possible from each other. The actual shape results in a tetrahedron shape. But the two hydrogens and 1 oxygen actually look like the aforementioned boomerang.
Whether a hydrogen-based energy system is environmentally cleaner than a fossil fuel system depends on ________. the car driven governmental incentives for research the amount of fossil fuels that are invested in long-term storage the source of oxygen used for the process the source of energy used to produce the hydrogen
A hydrogen energy system is made up of hydrogen production, transportation, storage, utilization etc. Whether a hydrogen-based energy system is environmentally cleaner than a fossil fuel system depends on the source of energy used to produce the hydrogen.
Hydrogen fuel cells often makes electricity by using hydrogen and oxygen atoms. The hydrogen is said to reacts with oxygen across an electrochemical cell.Hydrogen is known to carry some amount of energy carrier and can also deliver or store a large amount of energy. Hydrogen is often used in fuel cells to generate electricity, or power and heat.
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plz answer properly i need mt grades to be up
Answer: 7
Explanation:
Help with Complex Ions!
Determine the [Ag+] present in solution at equilibrium when the complexing agent ammonia is added to a 0.025 M solution of AgNO3 to result in a [NH3]eq = 0.15 M.
Solubility constant (Ksp) for Ag(NH3)2 2+ is 1.7 * 10^7.
The concentration of [Ag+] present in the solution is 6.53 × 10⁻⁸ M
From the given information, the equation for the reaction between silver ion and ammonia can be represented as:
Ag⁺ + 2NH₃ ↔ [Ag(NH₃)₂]⁺
Given that the solubility constant (Ksp) for the product formed = 1.7 × 10⁷.
The solubility constant for this reaction can be expressed as:
[tex]\mathbf{Ksp = \dfrac{[Ag(NH_3)_2]^+}{[Ag^+][NH_3]^2} }[/tex]
where;
concentration of ammonia = 0.025 Mconcentration of silver nitrate = 0.15 M[tex]\mathbf{1.7 \times 10^7 = \dfrac{0.025}{(x)(0.15)^2}}[/tex]
[tex]\mathbf{1.7 \times 10^7 = \dfrac{1.1111}{x}}[/tex]
[tex]\mathbf{x = 6.54 \times 10^{-8} \ M}[/tex]
Therefore, we can conclude that the concentration of [Ag+] = x = 6.54 × 10⁻⁸ M.
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What volume does 0.25 moles of oxygen gas occupy at STP ?
Answer:
[tex]\boxed {\boxed {\sf 5.6 \ L \ O_2}}[/tex]
Explanation:
We are asked to find the volume of 0.25 moles of oxygen gas.
At standard temperature and pressure or STP, one mole of any gas has a volume of 22.4 liters.
We want to convert 0.25 moles of oxygen gas or O₂ to liters. We will use dimensional analysis, so we must set up a conversion factor.
[tex]\frac {22.4 \ L \ O_2}{1 \ mol \ O_2}[/tex]
We are converting 0.25 moles of oxygen gas, so we multiply the conversion factor by this value.
[tex]0.25 \ mol \ O_2 *\frac {22.4 \ L \ O_2}{1 \ mol \ O_2}[/tex]
The units of moles of oxygen gas cancel.
[tex]0.25 *\frac {22.4 \ L \ O_2}{1 }}[/tex]
[tex]0.25 * 22.4 \ L \ O_2[/tex]
[tex]5.6 \ L \ O_2[/tex]
0.25 moles of oxygen gas occupy 5.6 liters at standard temperature and pressure.
how could you distinguish an element from a compound
Answer:
Elements are pure substances which are composed of only one type of atom. Compound are substances which are formed by two or more different types of elements that are united chemically in fixed proportions.
When particles in a solid or liquid move faster they move slightly further apart, what is this called?
When particles in a solid or liquid move faster they move slightly further
apart and is referred to as Elastic collision
Liquids and gases possess more kinetic energy than solids which is why
there is movement of its atoms in a system. Gas have the highest kinetic
energy and solids have the lowest. When the atoms move ,they collide with
one another which pushes the particles further apart.
The atoms in liquid and gas exhibit vibrational(rotational) motion which brings about movement and collision of the particles.
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(Help me out )
When a single electron returns to the ground state from an excited state, it emits___
1. A continuous spectrum of all wavelengths of light
2. A line spectrum of 2 or more wavelength of light
3. A single, specific wavelength of light
4. No light
Answer:
3) A single specific wavelength
Explanation:
When an electron returns to ground state, it has to emit a single photon.
When a single electron returns to the ground state from an excited state, it emits a single, specific wavelength of light. Therefore, option 3 is correct.
What is wavelength ?The separation between any two points in a wave and those identical points in the following wave cycle. This can be null-to-null, crest-to-crest, trough-to-trough, etc.
A spectrum is the term used to describe the range of wavelengths or frequencies for wave phenomena. The term was originally used to describe the electromagnetic spectrum, but it is now used to describe the sound spectrum and vibration spectrum.
When electromagnetic radiation such as radio waves, light waves, or infrared waves travel across space, they leave behind distinctive patterns. Each wave has a distinct size and form. Wavelength is the separation between peaks.
Thus, option 3 is correct.
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Read through the literacy task
find the mistakes and rewrite
Find and highlight the 10 mistakes
Atoms are the smallest particle that make up living things, they are made up of subatomic particles; protons, neutrons and electrons. Of these the electrons and neutrons are in the nucleus and the protons orbit around the nucleus. Of the subatomic particles, the electrons have the largest mass and are negatively charged, the neutrons (negative charge) and protons (positively charged) both have a relative mass of 1. Atoms contain an equal number of protons and neutrons, so carry no overall charge. An element is a substance made up of only two types of atom. Elements can be found in the Periodic table of elements, they usually have two numbers next to the chemical symbol, the larger number is generally the atomic number, which represents the number of neutrons and the number of protons. The smaller number is the relative atomic mass which represents the number of electrons or neutrons. In order to calculate the number of neutrons, you minus the atomic number from the relative atomic mass.
Answer:
Atoms are the smallest particle that make up living both living and non living things, they are made up of subatomic particles; protons, neutrons and electrons. Of these the electrons protons and neutrons are in the nucleus and the protons electrons orbit around the nucleus. Of the subatomic particles, the electrons have the largest smallest mass and are negatively charged, the neutrons (negative charge) (no charge) and protons (positively charged) both have a relative mass of 1. Atoms contain an equal number of protons and neutrons electrons, so carry no overall charge. An element is a substance made up of only two one type of atom. Elements can be found in the Periodic table of elements, they usually have two numbers next to the chemical symbol, the larger number is generally the atomic mass number, which represents the number of neutrons and the number of protons. The smaller number is the relative atomic mass atomic number which represents the number of electrons or neutrons protons. In order to calculate the number of neutrons, you minus the atomic number from the relative atomic mass.
What is the charge for H before electron share?
An H atom is made up of a nucleus with a +1 charge, as well as a single electron. Therefore, the only positively charged ion possible has charge +1.
I hope this helps!
How to find electrons.
Answer:
The number of electrons is the atomic number
What is the correct term for plants releasing water from their leaves which then evaporates?
A.precipitation
B.transpiration
C.condensation
Answer:
Transpiration is the correct answer mark me brainliest
What is infrared energy? simplify it
Answer:
It is a type of radiant energy that's invisible to human eyes but that we can feel as heat.
Which best describes the role of a negative feedback loop?
0 The output is reduced so the body can maintain homeostasis.
0 The output builds so the body can maintain homeostasis.
0 Hormone levels in the blood increase to increase effects.
0 Hormone levels in the blood decrease to increase effects.
Pls Hurry!!!! ANYONE PLS HELP ME!! I AM DOING THE UNIT TEST AND I NEED THIS FAST!!! APAP PPL!! PLS!! WILL MARK BRAINLIEST!!!
Answer:
A
Explanation:
now I'm not sure, but considering negative feedback allows the systems to self stabilize that would be the best option.
PLEASE NOTE THAT THIS IS A EDUCATED GUESS.
Li+1 is an ion of Lithium with an overall +1 charge. It has 3 protons. How many electrons does it have?
Answer:
2 electrons.
Explanation:
what is the best way to study and understand electron configuration??
Answer:
You have to remember this memory aid, diagonals and all.
You have to keep a tight tally of the electrons you’ve used so far so you don’t go over the number of electrons in the element you’re working on.
You have to remember how many electrons fit into each subshell (s, p, d, f).
It takes a lot of time, especially when the element has more than 20 electrons.
Explanation:
