Answer: we can ask simple qs like was it a fair experiment and what he was actually looking for. Other qs include his variables use and that how he has maintained the experiment. Finally we could ask him for his outcome and what it would ahve changed in the near future
Explanation:
a compound is a substance composed of two or more elements in a fixed ratio. true or false?
Answer:
its true..plz mark me brainliest
Explanation:
What is the percentage of Aluminum in Aluminum Sulfate?
Answer:
342. 15 g/mol is the mass
Al Aluminium 26.98g 2 atoms per mole = 15.7716%
S Sulfur 32.06g 3 atoms per mole = 28.1151%
O Oxygen 15.99g 12 atoms per mole = 56.1133%
Explanation:
Hope this helps
Answer:
15,7%
Explanation:
What is the percentage of Aluminum in Aluminum Sulfate?
Aluminum Sulfate
is Al2 (SO4)3
its molar mass is
(2 X 27) + (3 X 96) = 54 + 288 = 344
THE % Al IS (54 /344) X 100 = 15,7%
Which of these metric prefixes represent 1000?
(A). Centi
(B). Ecto
(C). Kilo
(D). Milli
Which solution has the greatest number of hydrogen ions? blood, pH = 7. 2 lemon juice, pH = 2 soda, pH = 3. 5 bleach, pH = 13. 5.
Answer:
pH=2 soda
Explanation:
There are more H+ ions in more acidic (lower on the pH scale) solutions. There are more H3O+ ions in more basic (higher on the pH scale) solutions.
Hope this helps!
Answer:
b. lemon juice pH=2
Explanation:
A chemical reaction resulting in the transfer of electrons or hydrogen atoms from one molecule to another is called a(n) _______ reaction.
Answer:
Explanation:
Oxidation reaction
The kind of reaction involving the transfer of electrons or hydrogen away from a molecule is called oxidation.
In the same vein, the molecule that receives the electron or the hydrogen atom is said to be reduced. This means that oxidation cannot exist in isolation without reduction.
In other words, oxidation is defined as:
Loss of electronsLoss of hydrogen atomsGain of oxygen atomsGain in oxidation numberWhile reduction is defined as:
Gain of electronsGain of hydrogen atomLoss of oxygen atomReduction in oxidation numberMore on oxidation/reduction reactions can be found here: https://brainly.com/question/3867774
The littoral zone is rich in nutrients
true or false
Answer:
false
Explanation:
What happens when potassium forms an ion?
Answer:
It loses an electron and has an octet in the next-lowest energy level
Explanation:
Identify three elements that form only one CATION.
Answer:
hyrogen,Lithium,beryllium
Describe how the production of a gas (carbon dioxide) suggests a chemical change
occurred?
PLZ HELP i need it now
difference between condensed milk and evaporated milk
The major difference that sets these two canned milk products apart is sugar content; sweetened condensed milk, as the name implies, is always sweetened, while evaporated milk is unsweetened
germanium has a cubic closest packed structure as a solid. assuming that germanium has an atomic radius of 159 pm, calculate the density of solid germanium.
Answer: Germanium has a cubic closest packed structure as a solid. Assuming that germanium has an atomic radius of 159 pm, calculate the density of solid germanium. __________ g/cm3 b.) Germanium has a face-centered cubic unit cell. The density of germanium is 5.32 g/cm3. Calculate a value for the atomic radius of germanium. ___________pm c.) You are given a small bar of an unknown metal X. You find the density of the metal to be 12.0 g/cm3. An X-ray diffraction experiment measures the edge of the face-centered cubic unit cell as 3.89 Å (1 Å = 1 ✕ 10−10 m). Identify X.
Explanation:
The density of Germanium is equal to 5.30g/cm^3
Data Given;
atomic radius = 159pmFor a cubic closest packed = 4r
[tex]4r = \sqrt{2a} \\ a = \frac{4}{\sqrt{2} }r\\ a = \frac{4}{2}*159*10^-^1^0\\ a = 4.50*10^-^8cm[/tex]
Density of the cubeThe density of the cube is given as the ratio between the mass and volume. But in this case, we have a formula
[tex]d = \frac{Zm}{Na^3}\\ d = \frac{4*72.64}{6.023*10^2^3*9.09*10^-^2^3}\\ d = 5.30 g/cm^3[/tex]
NB;
Z = number of facem = molar massN = Avogadro's constanta = side lengthThe density of the cube is equal to 5.30g/cm^3
Learn more about structure of an atom;
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which is larger 0.45 mol of a material or 2.75×10^23 of the same material?
I do not quite understand this, anyway someone can help? I'll give brainliest to the correct answer!
To solve for number one we must follow these steps:
m = 703.55 g − 345.8 g
m = 357.75 g
Then we solve for the density-
d = 357.75 g / 225 mL
d = 1.59 g/mL
Answer for number 5) 1.59 g/mL
Density= Mass/Volume
therefor- Mass = 65.14g and Volume = 35.4mL
Density = 65.14g/35.4 mL = 1.84 g/mL
Answer for number 6) 1.84 g/mL
Question 7-
g = (0.8765 g/mL)(250.0 mL) = 219.1 g
Answer: 219.1 g
Question 8-
Density = mass/volume
Mass = 1587g
4.5cm x 5.2cm x 6cm = 140.4 cubic-cm
Volume = 140.4 cubic-cm
Mass/volume = 1587/140.4 = 11.3 g/cm^3
Answer: 11.3 g/cm^3
Question 9:
First calculate the volume of iron
49.10mL − 45.50mL = 3.60mL
Density = mass/volume;
density = 28.5g/3.60 mL= 7.92 g/mL
Answer: 7.92 g/mL
Question 10:
Volume = 2500.0g / 10.5g/cm3 = 238.095cm^3
Now we round up the answer to 238cm^3
Answer: 238cm^3
I hope this helped!
What is the molarity of a HCl solution, if 28.6 mL of a 0.175 m NaOH solution is needed to neutralize a 25.0 mL sample of the HCl solution
The molarity of the HCl solution needed to neutralize 28.6 mL of a 0.175 M NaOH solution is 0.2002 M
We'll begin by writing the balanced equation for the reaction. This is given below:
HCl + NaOH —> NaCl + H₂O
From the balanced equation above,
The mole ratio of the acid, HCl (nA) = 1
The mole ratio of the base, NaOH (nB) = 1
From the question given above, the following data were obtained:Volume of base, NaOH (Vb) = 28.6 mL
Molarity of base, NaOH (Mb) = 0.175 M
Volume of acid, HCl (Va) = 25 mL
Molarity of acid, HCl (Ma) = ?The molarity of the acid, HCl can be obtained as follow:
MaVa / MbVb = nA / nB
(Ma × 25) / (0.175 × 28.6) = 1
(Ma × 25) / 5.005 = 1
Cross multiply
Ma × 25 = 5.005
Divide both side by 25
Ma = 5.005 / 25
Ma = 0.2002 MTherefore, the molarity of the acid, HCl needed for the reaction is 0.2002 M
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pls help me pls cuz i need a good grade
What change will occur if liquid gallium is removed from a hand
Answer:
Gallium's melting point is low enough that it can be melted in the human hand and then refrozen if the hand is removed. The liquid metal has a significant propensity to supercool below its melting/freezing points when exposed to high temperatures.
Explanation:
Hope it helps:)
A chemist has dissolved a certain substance in water. The chemist knows that more of the substance could be dissolved into the water before it stops dissolving. Therefore, the current solution is
.
Answer is: the current solution is unsaturated.
Unsaturated solution means that more of a substance can be dissolve.
For example:
Solubility of potassium chlorate (KClO₃) at 100 grams of water at 80°C is 37.5 g, that means that all 37.5 g is completely dissolves, this is the saturated solution.
If we add 20 grams of potassium chlorate in 100 grams of water, there is less solute than the saturated solution, so this is unsaturated solution.
in what states of matter are the atoms constantly moving in a substance or material?
Answer:
LIQUIDExplanation:
A substance that flows and keeps no definite shape because its molecules are loosely packed and constantly moving. It takes the shape of its container but maintains constant volume.
a double carbon-carbon bond is found in a molecule of
Answer:
ethene
Explanation:
as in ethene there is presence of double carbon which is commonly known as alkene group
What property determines whether an acid is a strong acid or a weak acid?
The dissociation of the ions
The total number of molecules
The pH of the acid
Answer:
the pH of the acid is the property that determines whether an acid is a strong acid or a weak acid
A beaker contains an acidified copper sulphate solution.A copper plate and a carbon plate is connected to postive terminal to battery whereas carbon rod is connected to negative terminal of battery.What will you observe when an electric current is passed through this setup for a considerable time
What is the energy of a photon emitted when an electron in a hydrogen atom relaxes from an orbital in ni
Answer: Ernest Z. The energy is 1.549×10-19J
Explanation:
Excess Na2SO4 (aq) is added to a 42.53 mL sample of Ba(NO3)2(aq).
1. What is the formula of the precipitate?
The formula for the precipitate is 2Na(NO3)(aq).
2. If 3.046 grams of precipitate was formed, what was the molarity of the Ba(NO3)2(aq)?
1. The formula of the precipitate formed is Ba₂SO₄(s)
2. The molarity of the Ba(NO₃)₂ solution is 0.188 M
1. Determination of the formula of the precipitate formed.
We'll begin by writing the net ionic equation for the reaction between Na₂SO₄ and Ba(NO₃)₂. This is given below:Na₂SO₄(aq) + Ba(NO₃)₂(aq) —>
2Na⁺(aq) + SO₄²¯(aq) + Ba²⁺(aq) + 2NO₃¯(aq) —> Ba₂SO₄(s) + 2Na⁺(aq) + 2NO₃¯(aq)
Cancel the spectator ions (i.e Na⁺ and NO₃¯) to obtain the net ionic equation
SO₄²¯(aq) + Ba²⁺(aq) —> Ba₂SO₄(s)
Therefore, the formula of the precipitate formed is Ba₂SO₄(s)
2. Determination of the molarity of Ba(NO₃)₂
We'll begin by calculating the number of mole of in 3.046 g of precipitate, Ba₂SO₄Molar mass of Ba₂SO₄ = (2×137) + 32 + (4×16) = 370 g/mol
Mass of Ba₂SO₄ = 3.046 g
Mole of Ba₂SO₄ =?Mole = mass /molar mass
Mole of Ba₂SO₄ = 3.046 / 370
Mole of Ba₂SO₄ = 0.008 mole Next, we shall determine the number of mole of Ba(NO₃)₂ required to produce 0.008 mole of Ba₂SO₄Na₂SO₄(aq) + Ba(NO₃)₂(aq) —> Ba₂SO₄(s) + 2NaNO₃(aq)
From the balanced equation above,
1 mole of Ba(NO₃)₂ reacted to produce 1 mole Ba₂SO₄.
Therefore,
0.008 mole of Ba(NO₃)₂ will also react to produce 0.008 mole of Ba₂SO₄
Thus, 0.008 mole of Ba(NO₃)₂ is required for the reaction.
Finally, we shall determine the molarity of the Ba(NO₃)₂ solutionMole of Ba(NO₃)₂ = 0.008 mole
Volume = 42.53 mL = 42.53 / 1000 = 0.04253 L
Molarity of Ba(NO₃)₂ =?Molarity = mole / Volume
Molarity of Ba(NO₃)₂ = 0.008 / 0.04253
Molarity of Ba(NO₃)₂ = 0.188 MLearn more: https://brainly.com/question/13403073
Segments of DNA found in chromosomes are called ——— ?
Answer:
Physically, a gene is a segment (or segments) of a chromosome. Functionally, a gene can play many different roles within a cell.
Explanation:
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Part D: Bohr’s Atomic Model Question 1 Using what you can recall from this unit, write one or two short paragraphs describing Niels Bohr’s atomic model. If needed, you may search the Internet for descriptions of the model.
Answer:
The Bohr Model is a planetary model in which the negatively-charged electrons orbit a small, positively-charged nucleus similar to the planets orbiting the Sun (except that the orbits are not planar). The gravitational force of the solar system is mathematically akin to the Coulomb (electrical) force between the positively-charged nucleus and the negatively-charged electrons.
Main Points of the Bohr Model
Electrons orbit the nucleus in orbits that have a set size and energy.
The energy of the orbit is related to its size. The lowest energy is found in the smallest orbit.
Radiation is absorbed or emitted when an electron moves from one orbit to another.
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A small positive charges nucleus is encircled by revolving negatively charged electrons in fixed orbits, according to the Bohr Atomic model.
What are the drawbacks of Bohr’s Atomic Model?The atom is basically depicted in the Bohr model as a central nucleus containing protons along with neutrons, with electrons in circular orbitals at various distances from the nucleus.
These orbits combine to form electron shells or energy levels, which allow you to see how many electrons are in each shell.
He concluded that electrons have more energy when they are located away from the nucleus, whereas electrons have less energy when they are located near the nucleus.
He was unable to explain the specifics of the Hydrogen and Helium atomic spectrums.
He did not explain how spectral lines split in the presence of a magnetic field. He did not explain the intensity of spectral lines.
Thus, these can be concluded regarding the Bohor's atomic model.
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which characteristic of bones is often very different from one individual to another?
a. the number of bones
b. the cellular make up of the bones
c. the size of the bones
d. the composition of the bones
which would best be categorized as heat transfer by conduction?
a.) wearing a white shirt to stay cool on a summer day
b.) warming your body under the sun in summer
c.) feeling the heat from a lightbulb with your hand when touching the bulb
d.) feeling the heat from a light bulb while holding your hand from 6 inches away
Answer:
c.) feeling the heat from a lightbulb with your hand when touching the bulb
Explanation:
In heat transfer by conduction, feeling the heat from a lightbulb with your hand when touching the bulb will be categorised as the best condition.
A sample of SO2 gas occupies 45.6 L at 373 K and 3.45 atm. How many moles of oxygen atoms?
Answer:
10.3
Explanation: i have this as a assignment rn sooo here you go :)
EXPERIMENT 4 : TYPES OF PLATE BOUNDARY
Answer:
Movement in narrow zones along plate boundaries causes most earthquakes. Most seismic activity occurs at three types of plate boundaries—divergent, convergent, and transform. As the plates move past each other, they sometimes get caught and pressure builds up.
Explanation: