Hello!
Answer:
Nucleus
Explanation:
Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA
Hope this helps have a wonderful day! :3
Answer:
Nucleus
Explanation:
1) How many radial seconds are in 80 degree angle?
Answer:
288000 sec
Explanation:
Name one material needed for
photosynthesis?
Answer:
carbon dioxide, water, and sunlight.
Explanation:
how is bacteria on mars counted as life but a heartbeat on earth is not?
A substance joined by this type of bond has a low melting point
Answer:covalent bonds
Explanation:
write any three reason for the profuse use of plastic . although it is harmful .
What is a atmosphere
This is the process that cells reproduce and replace old or damaged cells.
Question 5 options:
Mitosis
Meiosis
Ribosomes
Cytokinesis
Answer:
Mitosis
Explanation:
This is the process that cells reproduce and replace old or damaged cells.
An atom of helium is smaller in width then an atom of hydrogen, but it's more then twice the mass. Why are these different?
Answer:
i think it cuz ones broken down by fision more
Explanation:
am i correct?????????????????????????????
Answer:
yep you are correct.
Explanation:
Find the mass of 3.66 moles of nitrogen.
Answer:
102.5166Explanation:
Molar mass of N2 = 28.01
3.66 moles x 28.01 grams/mole = 102.5166
For the following word equations, write it as a chemical equation, then balance it.
copper (II) oxide + hydrogen gas ---- copper + water
CuO+H2=Cu+H2O the equation is balanced.
Chemical energy is contained in the chemical bonds of a substance. True or False
What does it mean if a trait is inherited
Answer:
An inherited trait is one that is genetically determined. Inherited traits are passed from parent to offspring according to the rules of Mendelian genetics.
Explanation:
How many Hydrogen atoms are in the following molecule? HCH3CCH2(NH3)2
How much copper is present in a cube that measures 3.20cm on each side, if the density of copper is 8.96 g/mL
Answer:
290.32 g
Explanation:
First we calculate the volume of the cube:
Volume = (3.20 cm)³ = 32.768 cm³Now we convert cubic centimeters to mililiters:
32.768 cm³ * 1 mL / 1 cm³ = 32.768 mLFinally we calculate the mass, using the equation for density:
Density = mass / Volumemass = Density * Volumemass = 8.86 g/mL * 32.768 mL = 290.32 gDifferent measures are used to specify amounts. The store has the same red delicious apples at two pricing options: a) 10 apples for $10.50 b) 3 lb bag of apples for $5.00 What do you need to know before you can select one of the above options?
Answer:
You need to know the weight in lb of 1 apple (or how manly apples there are in a 1 lb bag of apples)
Explanation:
Option a) presents the price for unit of apple: 10 apples for $10.50. So, the price of 1 apple is calculated as $10.50/10 = $1.05
Option b) presents the price for weight of a bag of apples: 3 lb bag of apples for $5.00. So, the price for 1 lb bag of apples is $5.00/3 = $1.66/lb. But we don't know how many apples there are in a 1 lb bag.
If we knew the approximate weight in lb of an apple, we would know how many apples there are in a 1 lb bag and then we can compare with the price for unit (option b vs option a). For example, if there is 1 apple in a 1 lb bag, option b) is more expensive than option a) ⇒ $1.66/apple > $1.05/apple
Help please I will give brainliest ASAP
Answer:
2H2S + 3O2 --> 2H2O + 2SO2
2 mol H2S/8 mol H2O = 0.25 mol
Explanation:
Reactants: H is 2; S is 1; O is 2
Products: H is 2; S is 1; O is 3
There are 3 oxygens so add a 2 to the H2O e and 3 to the reactants side.
H2S + 3O2 → 2H2O + SO2
Reactant side: H is 2; S is 1; O is 6
Product side: H is 4; S is 1; O is 4
Hydrogen is now out of balance, so a coefficient of 2 can be placed in front of H2S to give:
2H2S + 3O2 → 2H2O + SO2
Reactant side: H is 4; S is 2; O is 6
Product side: H is 4; S is 1; O is 4
Sulfur is unbalanced, so a coefficient of 2 can be placed in front of SO2 to give:
2H2S + 3O2 → 2H2O + 2SO2
LADY LIBRITY
The statue of liberty is made of copper and over time has been oxidized by water and air, making it green instead of silver. What kind of weathering is this?”
erosion
physical weathering
deposition
chemical weathering
Answer:
D. Chemical weathering
Explanation:
Chemical weathering is the erosion or disintegration of rocks, building materials, etc., that are caused by chemical reactions. The green patina on the Statue of Liberty is a direct result of chemical weathering to copper.
Chemical weathering depicts the reaction of Copper of the statue.
What is Chemical weathering?This is defined as the disintegration of a substance through chemical reactions.
The statue was said to be made of Copper which was oxidized by water and air thereby changing its color from silver to green is an example of chemical weathering.
Read more about Chemical weathering here https://brainly.com/question/974321
hi can you help me with these questions please
Molecular masses
1. CaCo3 (calcium carbon)
2. C6H12O6 (glucose)
3. Fe2O2 (iron oxide 11)
Avogadro's number
1. A sample of iron is known to contain 2.35 mol of Fe. How many iron atoms are there in the sample?
2. how many molecules are present in 150 grams of sulfuric acid (H2SO4)
Molar volume
1. What volume will 110g of dichloro (CI2) occupy when under normal conditions? 2. If you have 600g of CO2 gas and knowing that its molecular mass is 44g / mol, find
a) the number of moles
b) the number of molecules
c) the volume it occupies under normal conditions of pressure and temperature.
Answer:
iron oxide11
Explanation:
iron oxide is the chemical compound with formula fe304. it occurs in nature as the mineral magnetite.
Is gold more reactive than lead
Answer:
iron comes first then after its gold
Explanation:
most reactive to least reactive
potassium
sodium
calcium
magnesium
aluminium
carbon
zinc
IRON
tin
lead
hydrogen
copper
silver
GOLD
platinum
hope this helps!!
have a great day :)
4. Calculate AH for the reaction
Ca(OH)2(aq) + 2HCl(aq) → CaCl2(aq) + 2H2O(1)
delta H = ?
Given:
CaO(s) + 2HCl(aq) + CaCl2(aq) + H2O(1) delta H = -186 kJ
CaO(s) + H2O) + Ca(OH)(s) delta H = -62.3 kJ
Ca(OH)2(s) + Ca(OH)2(aq)
delta H = - 12.6 kJ
Answer:
ΔH = -111.1kJ
Explanation:
ΔH of any reaction could be obtained from similar reaction doing algebraic operations. Using the reactions:
(1) CaO(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) ΔH = -186 kJ
(2) CaO(s) + H₂O(l) → Ca(OH)₂(s) ΔH = -62.3 kJ
(3) Ca(OH)₂(s) → Ca(OH)₂(aq) ΔH = - 12.6 kJ
(1) - (2):
Ca(OH)₂(s) + 2HCl(aq) → CaCl₂(aq) + 2H₂O(l)
ΔH = -186kJ - (-62.3kJ) = -123.7kJ
This reaction -(3):
Ca(OH)₂(aq) + 2HCl(aq) → CaCl₂(aq) + 2H₂O(l)
ΔH = -123.7kJ - (-12.6kJ) = -111.1kJ
ΔH = -111.1kJ
The orbit of an asteroid is more rounded and less elliptical that the orbit of a comet.
a. true
b. false
Energy and frequency are
O None of these are correct
O inversely proportional to each other A
O directly proportional to each other
O independent of each other
Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)
If you start with 4.50 grams of Magnesium (Mg), how many grams of Hydrogen gas (H2) will you theoretically...
Answer:
Mg(s)+2HCl(aq)→MgCL2(aq)+H2(g), what mass of hydrogen will be obtained if 100 cm3 of 2.00 mol dm−3 HCl are added to 4.86 g of magnesium?
Explanation:
Moles of metal, = 4.86⋅g24.305⋅g⋅mol−1 = 0.200 mol.
Moles of HCl = 100⋅cm−3×2.00⋅mol⋅dm−3 = 0.200 mol
Clearly, the acid is in deficiency ; i.e. it is the limiting reagent, because the equation above specifies that that 2 equiv of HCl are required for each equiv of metal.
So if 0.200 mol acid react, then (by the stoichiometry), 1/2 this quantity, i.e. 0.100 mol of dihydrogen will evolve.
So, 0.100 mol dihydrogen are evolved; this has a mass of 0.100⋅mol×2.00⋅g⋅mol−1 = ??g.
If 1 mol dihydrogen gas occupies 24.5 dm3 at room temperature and pressure, what will be the VOLUME of gas evolved?
sana maka tulong po
How is the behavior of electrons in an ionic bond different from the behavior of electrons in a covalent bond?
Answer:
The correct answer is "Electrons are transferred in an ionic bond"
Explanation:
The covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule. Covalent bonds are established between non-metallic elements, such as hydrogen H, oxygen O and chlorine Cl. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas. The shared electron pair is common to the two atoms and holds them together.
An ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion.
In conclusion, chemical bonds are made so that atoms can have their entire outer layer, and thus have a stable electronic configuration. In the ionic bond, when the metallic atom has only one electron in its outer layer and the non-metallic one needs an electron to complete its layer; The metallic atom seats its electron to the non-metallic one. In the same way, the electron is shared in the covalent bond in order to achieve equilibrium.
Then, the main differences between the two bonds are that the ionic bond occurs between two different atoms (metallic and non-metallic), while the covalent bond occurs between two equal atoms (non-metallic). And in the covalent bond there is an electron compartment, while in the ionic bond there is an electron transfer.
So, the correct answer is "Electrons are transferred in an ionic bond"
Answer:
In ionic bonds, an atom donates an electron to another atom to stabilize it. The electron spends more time with the bonded atom.
In covalent bonds, atoms bond by sharing electrons equally.
can someone help me please-
i just need some answers-
Answer:
1.Newton's first law is often called the law of inertia.
2.Newton's second law of motion is F = ma
3.An object not wanting to change its speed or direction
4.a bike would have more acceleration
5.it doesn't have auto brakes and its lighter than a motorcycle
6. Second law
7. First law
8. First law
9. Second law
10. First law
Those should be right!
Plssssssssssssssss help me!!!!!
It's due soon!!
It's worth 4 marks about bonding.
Answer:
See explanation
Explanation:
Ammonia is a covalent molecule. We should remember that a covalent molecule is formed by the sharing of electrons.
Now hydrogen has only one valence electron while nitrogen has five valence electrons. Two among these five valence electrons is a lone pair of electrons.
Three hydrogen atoms can share one electron each with all of the available valence electrons in nitrogen to form NH3 with the lone pair of electrons still localized on the nitrogen atom.
the metallic compound reduced to the metal by electrolysis is _____
please girls answer, because I think u r always right.
Answer:
Explanation:
u wanted to talk
One mole of any gas at 298 K and 1 atm occupies a volume of 22.4 L.
Group of answer choices
True
False
Answer:
false darling
Explanation:
20 points
Which of the following objects below is NOT needed to test electrical conductivity?
battery
object powered by electricity
insulated wire
electrical tape
Answer:
I`m pretty sure it`s electrical tape.
Explanation:
The objects which does not conduct electricity are called insulators which are not needed to test electrical conductivity. Hence, insulated wire is the correct option.
What is conductivity ?Conductivity of a substance is the ability to conduct electrically or thermally through the substance. Based on their conductivity, there are three classes of materials conductors, semiconductors and insulators.
Conductors are materials conducting heat and electricity at all temperatures. Semiconductors conduct only at higher temperature or on doping. Insulators are material does not conduct at any condition.
Metals are good conductors. Silicon , germanium etc. are semiconductors. Whereas, wood, plastic etc. are insulators they does not allow flow of electrons through it. Therefore, an insulated wire is not needed to test conductivity.
Find more on conductivity:
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