Answer:
Humans have 23 pairs of chromosomes.
A trisomy is a chromosomal condition characterised by an additional chromosome.
A person with a trisomy has 47 chromosomes instead of 46.
Down syndrome, Edward syndrome and Patau syndrome are the most common forms of trisomy.
Explanation:
Someone help me with this pls
Which of the following is NOT a chemical reaction?
Select one:
a.
Hydrogen and oxygen combine to make water
b.
Ammonia breaks up into nitrogen and hydrogen
c.
Ice melts to form water
What is a element
2. compound
3.molecules
Answer:
what is Element: each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms.
Explanation:
2. compound:a thing that is composed of two or more separate elements; a mixture.
3. Molecules: A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge
Cyclobutane consists of 4 atoms of carbon and 8 atoms of hydrogen. What is cyclobutane's empirical formula
Answer:
What is cyclobutane empirical formula : C4H8
Explanation:
what word describes when tiny droplets of one liquid are finely dispersed within another liquid?
When tiny droplets of one liquid are finely dispersed within another liquid it is called emulsion.
Emulsion can be defined as the process by which two liquids that are not miscible come together to form a mixture.
The emulsion mixture usually consists of an oil phase and a water phase.
The oil phase appears as droplets when dispersed (mixed with) the water phase.
The uses of emulsion include:
It is used in chemical industries for production.It is used for production of medicine.Digestion of fatty food components in the intestine takes place through the process of emulsion.Learn more here:
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the total charge of an atom comes from
a) protons only
b) neutrons only
c) protons and neutrons
d) protons and electrons
The total charge on an atom comes from protons and electrons.
The proton is positively charged while the electron is negatively charged. A neutral atom would have an equal number of protons and electrons.
An atom with more protons than electrons will be positively charged while those with more electrons than protons will be negatively charged.
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At a pressure of 125 atm, a sample of a gas has a volume of 150 L. What pressure does it have when the gas is compressed to 40 L? show work
Answer:
???
Explanation:
I have no clue sorry
5. When argon was discovered, it was placed between chlorine and potassium, even though the periodic
table at that time was organized by increasing atomic weight. Why did scientists choose to place argon
before potassium?
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Which statement BEST describes how many Aluminum atoms are needed when making Aluminum chloride?
Question 11 options:
1 Aluminum atom is needed because Aluminum donates one valence electron to Chlorine.
3 Aluminum atom is needed because Aluminum donates three valence electron to Chlorine.
3 Aluminum atom is needed because Aluminum accepts three valence electron from Chlorine.
2 Aluminum atom is needed because Aluminum accepts three valence electron from Chlorine.
Answer:
34 Aluminum Atoms needed to make Aluminum Chloride
Explanation:
Because through this bottom 34 atoms are subheading to make Aluminum Chloride through magnesiumWhat causes the electrons to move and form static electricty?
contact between two substances
friction
Moist air
Answer:
Static electricity is the result of an imbalance between negative and positive charges in an object. ... When two materials are in contact, electrons may move from one material to the other, which leaves an excess of positive charge on one material, and an equal negative charge on the other.
Answer: 1) Contact between two substances.
Explanation:
#1 When fuel is running through pipes, there is a lot of contact between the fuel and the pipe.
To avoid explosions, fuel trucks have a metal chain that hangs to the ground to discharge the static. When a jet plane is being fueled up, it is first connected to a metal spike that is sunk down into the ground.#2 Before, people thought that Static at first was caused by friction, meaning the rubbing (of an object, pause) had something to do with static.
People later on noticed that fuel trucks and jet planes were being filled with fuel.A large static charge built up from the fuel running through the pipes when fuel trucks and jet planes were being filled with fuel.End note: Your welcome. My apologies if I was late, I was trying to find the answer to this question, too, until I got all this information while taking notes from my Physical Science lesson.
If 77.0 mL of nitrogen gas is collected over water at 50 °C and 763 mm Hg, what is the volume of dry nitrogen gas at STP? The vapor pressure of water at 50 °C is 92.5mm Hg.
The volume of the dry nitrogen gas at STP is 57.4 mL
From the question given above, the following data were obtained:
Initial volume (V₁) = 77 mL
Initial temperature (T₁) = 50 °C = 50 + 273 = 323 K
Initial pressure (P₁) = 763 – 92.5 = 670.5 mmHg
Final temperature (T₂) = STP = 273 K
Final pressure (P₂) = 760 mmHg
Final volume (V₂) =?The volume of the dry nitrogen can be obtained by using the combine gas equation as follow:
[tex] \frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2} \\ \\ \frac{670.5 \times 77}{323} = \frac{760 \times V_2}{273} \\ \\ cross \: multiply \\ \\ 323 \times 760 \times V_2 = 670.5 \times 77 \times 273 \\ \\ divide \: both \: side \: by \: 323 \times 760 \\ \\ V_2 = \: \frac{670.5 \times 77 \times 273 }{323 \times 760} \\ \\ V_2 = 57.4 \: ml[/tex]
Therefore, the volume of the dry nitrogen gas is 57.4 mL
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Explain how the complexity and diversity of living things has changed over time
Answer:
Dylan invested $ 600 in a savings account at a 1.6 % annual interest rate . He made no deposits or withdrawals on the account for 2 years. The interest was compounded annually . Find, to the nearest cent, the balance in the account after 2 years. a₁ What information from the question is important ? b . How much does Dylan have in his bank account after 2 years ? Show work .
Which of these figures correctly illustrates the nature of the bonding of h2o?.
H2O is composed of two hydrogen atoms and one oxygen atom. The central oxygen atom is sp3 hybridized.
H2O is composed of two hydrogen atoms and one oxygen atom. The oxygen atom is bonded to the two hydrogen atoms at a dihedral angle of 104°. There are two lone pairs on the oxygen atom. The molecule has a bent geometry.
The structure of H2O is shown in the image attached to this answer. The central oxygen atom is sp3 hybridized and the shape of the molecule is based on a tetrahedron owing to its electron pair geometry.
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PLS HELP: Endocrine Organs Crossword
cobalt iii percarbonate as a formula
Answer:
Co2(CO3)3
Hope this helps!!
A sound wave is an example of a __________ wave. It requires a _________ to transfer energy
Question 2 options:
medium, longitudinal
longitudinal , medium
medium, transverse
transverse, medium
Answer:
example of a medium, it requires a transverse
Help please, take a screenshot who will answer will be brainiest.
Answer:
1. Metals are typically shiny, and good at conducting electricity and heat and have a high melting point. Non-metals are typically dull, and poor at conducting electricity and heat and have a low melting point.
2. Element C and element E.
3. a. It is a poor conductor of electricity
b. It is a good conductor of heat
Explanation:
As it says in the chart at the top of the picture, metals are typically good at conducting electricity and heat and have a high melting point. Non-metals are typically poor at conducting electricity and heat and have a low melting point.
How are traits inherited?
Please explain thoroughly
inherited traits are passed from parent to offspring according to the rules of Mendelian genetics. Most traits are not strictly determined by genes, but rather are influenced by both genes and environment
Which was the first ""cell"" viewed by the light microscope?microbeatomdnaoak bark.
Answer:
The cork cell
Explanation:
400.0 mL of a 0.425 M solution of NaCl is diluted to 900.0 mL. What is the new concentration of the solution
The new concentration of the solution that has 400.0 mL of a 0.425 M solution of NaCl diluted to 900.0 mL is 0.189M
HOW TO CALCULATE CONCENTRATION:
The concentration of a diluted solution can be calculated using the following formula:C1V1 = C2V2
Where;
C1 = initial concentrationC2 = final concentrationV1 = initial volumeV2 = final volumeAccording to this question, a solution of NaCl has 400.0 mL of a 0.425 M solution and diluted to 900.0 mL. The new concentration is as follows:400 × 0.425 = 900 × C2
170 = 900C2
C2 = 170 ÷ 900
C2 = 0.189M
Therefore, the new concentration of the solution that has 400.0 mL of a 0.425 M solution of NaCl diluted to 900.0 mL is 0.189M.Learn more at: https://brainly.com/question/8795644?referrer=searchResults
una pieza de hierro de 25cm3 tiene una masa de 195g cual es su densidad?
Answer:
Pretend you are a TV producer. Think of ideas for new TV shows. Your objective is to create ideas that will be successful, regardless of whether this is quality programming or not. Think of an idea of a copy. Explain the basics of what this show will be like and what show it is copying. Explain why you feel this show will be popular. Think of an idea of a spin-off. Explain the basics of what this show will be like and what show it is spinning off from. Explain why you feel this show will be popular. Think of an idea for a TV show that falls into one of the genre categories listed in the genre chart. Describe the basics of the show and how it falls under the genre’s expectations for characters, plots, and aesthetics. Explain why you feel this show will be popular.
write a molecular, ionic, and net ionic equation for the reaction between solid magnesium carbonate and sulfuric acid.
Answer:
How to Write the Net Ionic Equation for H2SO4 + MgCO3 = MgSO4 + H2O + CO2 -
A net ionic equation also contains the spectator ions, whereas a net ionic equation just displays the chemical species that are involved in a process.
what is Net ionic equation?The net-ionic equation is a chemical equation that is used to express the condensed chemical reaction for a reaction that takes place in an aqueous solution. The ions involved in the production of a precipitate, water, or molecule are illustrated by the net-ionic equation. For precipitation, oxidation-reduction, and neutralization processes, net-ionic equations are frequently written.H₂SO₄ (aq) + MgCO₃ (s) →H₂O (l) + CO₂(g) + MgSO₄(aq)
An ionic equation is a chemical equation in which the electrolytes in aqueous solution are stated as dissociated ions. It is similar to a molecular equation in which substances are described as molecules.Learn more about the Net ionic equation with the help of the given link:
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If a particular utility burned 6.17 million tons of coal that was 2.00% sulfur by weight, how many tons of sulfur dioxide was emitted?
246800 tons of sulfur dioxide was emitted by the utility company who burned 6.17 million tons of coal.
6.17 million tons of coal contain 2.00% sulfur, hence the weight of sulfur is:
Weight of sulfur = 2% of 6.17 million tons = 0.02 * 6170000 = 123400 tons
123400 tons of sulfur is found in 6.17 million tons of coal
The weight of sulfur dioxide is twice that of sulfur, hence:
Amount of sulfur dioxide emitted = 2 * 123400 tons = 246800 tons
246800 tons of sulfur dioxide was emitted.
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What is the molar mass of an unknown gas with a density of 3.35 g/L at 1.00 atm and 25.0 °C
Answer:
[tex]\implies \sf D = \dfrac{PM}{RT}[/tex]
[tex]\implies \sf 3.35= \dfrac{1 \times M}{ \frac{1}{12} \times 298}[/tex]
[tex]\implies \sf 3.35= \dfrac{12\times M}{ 298}[/tex]
[tex]\implies \sf 3.35 \times 298= 12\times M[/tex]
[tex]\implies \sf 998.3= 12\times M[/tex]
[tex]\implies \sf M = \dfrac{998.3}{12} [/tex]
[tex]\implies \bf M = 83.1917 \: \frac{g}{mol} [/tex]
A fusion reaction always creates which of the following?
a A massive amount of energy.
b A massive amount of heat.
C A more massive atomic nucleus.
d A massive number of smaller nuclei.
A fusion reaction can be regarded as the type of reaction that occurs where two lighter elements come together in a type of reaction giving rise to a heavier/more massive element.
A fusion reaction always creates a more massive atomic nucleus (option c).
When the two lighter nuclei comes together in a reaction, a more heavier/massive nucleus is formed but its mass will still be less than the combined mass of the two reactant nuclei.
This also indicates that the left over mass may have been released as energy.
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Please help me, I'm stuck and I don't know how to do it.
How many atoms are there in 7.02 g Si ?
Answer:
1.51e23 atoms
Explanation:
First, using the molar mass of Si (28.1 g/mol), determine the # of moles of Si we have. Then use Avogadro's number (6.022e23 atoms = 1 mol) to convert the # of moles to the # of Si atoms.
(7.02 g Si)([tex]\frac{1 mol}{28.1 g}[/tex]) = 0.250 mol Si
(0.250 mol Si)([tex]\frac{6.022*10^{23} atoms }{1 mol}[/tex]) = 1.51e23 atoms
The atomic mass of Silicon (Si) is 28.09 g/mol. The no. of atoms present in 7.02 g of Si is 1.46 × 10²³.
What is a mole?Any substance containing 6.022 × 10²³ atoms is called one mole of that substance. The no.of moles can be calculated by dividing the given weight by the atomic mass of the substance.
Atomic mass of Si = 28.09 g/mol
Given mass = 7.02 g.
No.of moles = 7.02 g/ 28.09 g/mol
= 0.24 moles
One mole contains 6.02 × 10²³ atoms. Thus 0.24 mole of Si contains 6.02 × 10²³ × 0.24 = 1.46 × 10²³ atoms.
Hence, no.of atoms present in 7.02 g of Si is 1.46 × 10²³ .
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How many particles or molecules of hydrogen are there in one mole of H2O?
6.022 × 10^23 ×2 = 12.044 × 10^ 23 atoms
Answer:
In one mole of water, there will exist approximately 6.02⋅1023 water molecules. So, there will be a total of 6.02⋅1023⋅2≈1.2⋅1024 hydrogen atoms.
some macromolecules are polymers. what is a polymer
Answer:
1 marcomolecules are:- A macromolecule is a very large molecule, such as a protein. They are composed of thousands of covalently bonded atoms. Many macromolecules are polymers of smaller molecules called monomers.
2 polymers are:- a natural or artificial chemical compound consisting of large molecules
Explanation:
hope it helps you
the molecule represented within the box labeled z is
Answer:an amino acid
Explanation:
For me this was the correct answer on a castle learning
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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
