Answer:
a element and compounds
Answer:
The answer is D) compounds and pure substances.
Explanation:
Here's why: All three items are examples of compounds and pure substances. They are not pure elements or molecules.
How many molecules are present in 3.09 mol of silicon dioxide, SiO2
There are 1.86 x 10²⁴ molecules of Silicon dioxide, SiO₂
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
Moles can also be determined from the amount of substance mass and its molar mass
1 mol = 6.02.10²³ particles
Can be formulated
[tex]\tt \boxed{\bold{N=n\times No}}[/tex]
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Given3.09 mol of Silicon dioxide, SiO₂
n=mol=3.09
Number of molecules :[tex]\tt N=n\times No\\\\N=3.09\times 6.02\times 10^{23}\\\\N=\boxed{\bold{1.86\times 10^{24}~molecules}}}[/tex]
Which salt would HI and NH4OH produce?
Which statement describes magnetic force?
O A. Every magnet has three poles.
O B. All materials are magnetic.
O C. Magnets can only repel each other.
O D. A north pole and a south pole attract each other.
Answer:
D. A north pole and south pole attract each other
Answer:
D
Explanation:
Predict the density of acetylene gas (C2H2) at 0.910 atm and 20oC.
Answer:
d = 0.98 g/L
Explanation:
Given data:
Density of acetylene = ?
Pressure = 0.910 atm
Temperature = 20°C (20+273 = 293 K)
Solution:
Formula:
PM = dRT
R = general gas constant = 0.0821 atm.L/mol.K
M = molecular mass = 26.04 g/mol
0.910 atm × 26.04 g/mol = d × 0.0821 atm.L/mol.K×293 K
23.7 atm.g/mol = d × 24.1 atm.L/mol
d = 23.7 atm.g/mol / 24.1 atm.L/mol
d = 0.98 g/L
Is the following equation balanced or unbalanced?
H2 + O2 + H2O
Answer:
its looks unbalanced too me
Explanation:
6th grade science i mark as brainliest
Answer:
It's the 4th one. The car is accelerating gradually.
what does "8 is great" mean as it pertains to valence electrons?
Answer:
stability and completely filled orbitals
Explanation:
As it pertains to valence electrons, "8 is great" means the valence electrons present in the orbital confers stability on the atom as the shell becomes completely filled.
For an atom to be stable, it must have completely filled outer orbitals. The number of electrons required is usually 8. This is the octet number which confers special stability on an atomic configuration. Elements having this number of electrons in their outer shell are unreactive.How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?
Answer:
It is decreased to one third of its original volume
Explanation:
help pls i will give 15 point
Explain why halogens have a higher first ionization energy than group 16 elements?
Explanation:
Halogens are elements found in the 7-th group on the periodic table. They are predominantly know for their electronegativity values and they have a high ionization energy.
Ionization energy is the energy required to remove the most loosely held electrons in an atom. Across a period, ionization energy is known to increase progressively from left to right. This due to the decreasing atomic radii caused by the increasing nuclear charge which is not compensated for by successive electronic shells.All weather is energy in motion. Where does the energy come from
Answer:
The Sun radiates huge amounts of energy. Only a small portion of that energy hits the Earth, but it is enough to light our days, heat our air and land, and create weather systems over the oceans. Most of the energy you will learn about comes from the Sun. The Earth also gives off energy.
Explanation:
Answer:
"The Sun radiates huge amounts of energy. Only a small portion of that energy hits the Earth, but it is enough to light our days, heat our air and land, and create weather systems over the oceans. Most of the energy you will learn about comes from the Sun. The Earth also gives off energy."
By the way I got this off thee internet and copy and pasted it so don't write it just look and write in your own words please. Please do not copy and paste or write what i wrote because this is someone else's explanation or answer
Hope this helps!! Also please rank thank you.
Explanation:
Industrial deep-sea divers must breathe a mixture of helium and oxygen to prevent a disorienting condition known
as nitrogen narcosis. If a diver's tank is filled with a helium-oxygen mixture to a pressure of 170 atmospheres and the
partial pressure of helium is 110 atmospheres, the partial pressure of the oxygen is -
Answer:
60
Explanation:
hope this helps :)
If a diver's tank is filled with a helium-oxygen mixture to a pressure of 170 atm and the partial pressure of helium is 110 atm, the partial pressure of the oxygen is 60 atm.
What is Dalton's theory?Dalton's theory of partial pressure states that total pressure of any mixture of gas is equal to the sum of the partial pressure of each gas present in that.
Given that total pressure of mixture = 170 atm
Partial pressure of helium = 110 atm
Partial pressure of oxygen = 170 - 110 = 60 atm
Hence partial pressure of oxygen gas is 60 atm.
To know more about dalton's law, visit the below link:
https://brainly.com/question/9211800
#SPJ2
Can someone please help me fill this out?
How many molecules of H2O and O2 is present in 8.5g of H2O?
Answer:
2.8 x 10²³ molecules H₂O
1.4 x 10²³ molecules O₂
Explanation:
First, you will need the balanced chemical equation for the formation of water:
2H₂ + O₂ -> 2H₂O
This will help in determining the mole ratios between water and oxygen, which we will need later.
Let's first calculate the number of H₂O (water) molecules. This will require stoichiometry. We are also given the mass, so we must convert mass into moles, then moles into molecules. mass -> moles -> molecules
8.5 g H₂O x (1 mol H₂O/18.01528 g H₂O) x (6.02 x 10²³ molecules H₂O/1 mol H₂O) = 2.8404 x 10²³ molecules H₂O
Rounded to 2 significant digits: 2.8 x 10²³ molecules H₂O
Now, to find the molecules of water, we can begin with the same stoichiometric equation, but before we convert to molecules, we will have to convert moles of water to moles of oxygen. This is where we will use the mole ratio of water to oxygen we got from the balanced chemical equation earlier. 2H₂O:1O₂
8.5 g H₂O x (1 mol H₂O/18.01528 g H₂O) x (1 mol O₂/2 mol H₂O) x (6.02 x 10²³ molecules O₂/1 mol O₂) = 1.4202 x 10²³ molecules O₂
Rounded to 2 significant digits: 1.4 x 10²³ molecules O₂
An unknown substance kept in a sealed container at room temperature has a pressure of 2 atm. When the container was opened, the substance was exposed to normal atmospheric pressure, 1 atm. Which change did the substance most likely undergo?
Neither the temperature nor the volume will change.
The volume will decrease.
The volume will increase.
The temperature will increase.
Answer:
I took the test it's C.The volume will increase.
Explanation:
Since the pressure went down from 2 atm to 1 atm, the volume will go up! They are inversely related.
The change that the substance most likely underwent is that the volume will increase.
BOYLE'S LAW:
The relationship between the volume of a gas and its pressure is explained by Boyle's law. Boyle's law states that the volume is inversely proportional to the pressure of a given gas. This means that as the pressure of a gas increases, its volume also increases and vice versa. According to this question, an unknown substance kept in a sealed container at room temperature and a pressure of 2 atm changed to normal atmospheric pressure (1 atm). This depicts that the volume of the gas increased since the atmospheric pressure decreased.Learn more at: https://brainly.com/question/1437490?referrer=searchResults
Boiling point and density are examples of
a) intensive properties
b) respective properties
c) reflective properties
d) extensive properties
Answer:
the answer is A
Explanation:
3. (05.04 MC)
What mass of Hy is needed to react with 8.75 g of Oz according to the following equation: 02(g) + H2(g) → H2O(g)? (4 points)
Answer:
1.10 g H2
Explanation:
Which of the following describes an ionic bond?
A.electrons are shared between non-metals.
B.electrons are gained by metals to become anions.
C.a cation attracts an anion.
D.a "sea of electrons" causes a lattice structure to form.
How do scientists determine whether a chemical reaction releases or stores energy
A compound has the name iodine pentafluoride. What kind of bond is present between the atoms? A. O Metallic B Covalent C. Hydrogen D Ionic
Answer:
IF(subscript 5)
Explanation:
covalent.
The bond present between the iodine and fluorine in iodine pentafluoride has been a nonpolar covalent bond.
The intermolecular bonds between the atoms result in the stability of the compounds. The bonds formed between the atoms with the same electrical charge and less difference in the electronegativity have been the nonpolar covalent bonds.
The iodine and fluorine have been the halogen atoms with a negative charge and less difference in electronegativity. Thus, the bond present between the iodine and fluorine in iodine pentafluoride has been a nonpolar covalent bond.
For more information about the intermolecular interactions, refer to the link:
https://brainly.com/question/12025304
What is the name of the compound represented by Ca3P2
A.) calcium Phosphite
B.) Tricalcium diphosphide
C.) Calcium Phosphate
D.) Calcium Phosphide
Answer:
Calcium phosphide (D)
Explanation:
Hope I helped^^
Can i please get brainliest
what element has an electron
configuration of 2-8-8-1:
What is platonic plate boundary?
Best answer gets brain-list.
Answer:
Earth’s tectonic plates fit together in a jigsaw puzzle of plate boundaries.
The Earth’s outer shell, the lithosphere, consisting of the crust and uppermost mantle, is divided into a patchwork of large tectonic plates that move slowly relatively to each other. There are 7-8 major plates and many minor plates. Varying between 0 to 100mm per year, the movement of a plate is driven by convection in the underlying hot and viscous mantle.
Explanation:
In this stoichiometry problem, determine the limiting reactant:
Aqueous copper(II) nitrate reacts with aqueous sodium sulfide to produce aqueous sodium nitrate and copper(II) sulfide as a precipitate. In this reaction 469 grams of copper(II) nitrate were combined with 156 grams of sodium sulfide to produce 272 grams of sodium nitrate. Select all that apply.
The limiting reactant : Na₂S
Further explanationReaction
Cu(NO₃)₂ (aq) + Na₂S (aq) ⇒ 2 NaNO₃ (aq) + CuS (s)
mol Cu(NO₃)₂ :(MW 187,56 g/mol)
[tex]\tt mol=\dfrac{469}{187.56}=2.5[/tex]
mol Na₂S :(MW 78,0452 g/mol)
[tex]\tt mol=\dfrac{156}{78.0452}=2.0[/tex]
Limiting reactant(smaller ratio⇒ between mol and coefficient) :
1 mol Cu(NO₃)₂ : 1 mol Na₂S , so the limiting reactant : Na₂S( 2 < 2.5)
can someone help me with science plz. Make a prediction: What do you think the petri dish will look like on Day 5?
Answer:
it would have some bacteria considering it would probs take up to 4-6 days for it to grow
Explanation:
Find the density of an object with the mass of 14 g and volume of 2cm^3. O 28 g/cm O 7 g/cm O 1/2 g/cm 0 / 56 g/cm
Answer:
7 g/cm^3
Explanation:
What is the density of a rock that has a mass of 555 g and a volume of 101.1 cm?
Answer:
the volume should be in cubic cm so I assumed that you wanted to write the same . then the answer is 5489.07 kg/m^3
Answer:
[tex]\boxed {\boxed {\sf d\approx5.49 \ g/cm^3}}[/tex]
Explanation:
Density can be found by dividing the mass by the volume.
[tex]d=\frac{m}{v}[/tex]
The mass of the rock is 555 grams and the volume is 101.1 cubic centimeters.
[tex]m=555 \ g \\v= 101.1 \ cm^3[/tex]
Substitute the values into the formula.
[tex]d=\frac{555 \ g}{101.1 \ cm^3}[/tex]
Divide.
[tex]d=5.48961424 \ g/cm^3[/tex]
Let's round to the nearest hundredth to make the answer more concise.
The 9 in the thousandth place tells us to round up. In the tenth place, the 8 will become a 9.
[tex]d\approx5.49 \ g/cm^3[/tex]
The density of the rock is about 5.49 grams per cubic centimeter.
Explain why a lithium ion (Li+) is smaller than a lithium atom (Li).
Answer:
Lithium ions are smaller than lithium atoms. This is because the lithium atom has 2 shells, while the ion just has one shell. Bromide ions are larger than bromine atoms, due to increased inter-electronic respulsion.
Explanation:
hope this helps! maybe mark me brainliest?
Type the chemical name of the compound that contains 1 copper atom, 1 oxygen
atom, and 1 hydrogen atom.
Answer:
Copper (I) hydroxide
Explanation:
Copper (I) hydroxide is a chemical compound with the chemical formula of CuOH. One copper atom (Cu), one oxygen atom (O), and one hydrogen atom (H.)
which term refers to a property that depends only on the amount of a substance
Answer:
d
Explanation:
