(PLS HELP)
Describe three of your favorite foods. How do they change phases of matter when they are heated?
Answer:
ice.
Explanation:
it becomes a liquid
Carbon and Oxygen react to form Carbon Dioxide. What are the reactants?
A. Carbon and Dioxide
B. Oxygen and Carbon
C. Oxygen and Dioxide
D. CO2
Which of these elements have just one valence electron?
A. Potassium
B. Beryllium
C. Carbon
Answer:
A
Explanation:
potassium because it has valance electrons by giving out proteins
Why does moisture appear on the outside of a cold glass of water?
Answer:
it appears because Of condensation
Answer:it is called condensation
Explanation:
What is the number of grains of rice in the 40 mL sample? Show all of your work using dimensional analysis.
The number of grains of rice in the 40 mL sample : 880 grains
Further explanationGiven
from recorded data:
mass of 20 grains rice = 0.4 g
mass beaker = 29.5 g
mass beaker+rice=47.1 g
mass only rice = 17.5 g
Required
the number of grains of rice
Solution
Maybe if we use a digital scale with high resolution accuracy we can get the mass of 1 grain of rice
But we still use existing data
To determine the mass of rice in the beaker, we just need to find the difference between the mass of the beaker + rice - beaker, or we can set the scale to zero before we add rice to the beaker.
If we look at this difference, the mass of the rice in the beaker should be :
47.1-29.5 = 17.6 g
Since the data shows that 20 grains of rice mass 0.4 g, so 17.6 g of rice contains:
[tex]\tt 17.6~g\times \dfrac{20~grains}{0.4~g}=880~grains[/tex]
can someone sell me what Asexuality means lol
Answer:
Asexuality is the lack of sexual attraction to others, or low or absent interest in or desire for sexual activity. It may be considered a sexual orientation or the lack thereof. It may also be categorized more widely to include a broad spectrum of asexual sub-identities.
Explanation:
What type of bond is between the oxygen atoms in the following: O2?
single
double
triple
Answer:
Double bond
Explanation:
Why do you think people cannot drink seawater?
Answer:
Its contaminated
Explanation:
Two electrons in the 1s orbital must have different spin quantum numbers to satisfy
Hund's Rule
The Magnetic Rule
The Pauli Exclusion Principle
The Aufbau Principle
Answer: The Pauli Exclusion Principle
Explanation:
The electrons are filled in orbitals of equal energy with one electron entering each orbital until all the orbitals contain one electron with the same spin. The pairing of electrons take place thereafter.
The first electron in an orbital could have +1/2 spin or -1/2 spin. All of the electrons in singly occupied orbitals have the same spin so as to maximize total spin. which is given by Hunds rule.
Two electrons must have opposite spin and thus different spin quantum numbers is given by Pauli's exclusion principle.
What else is produced during the combustion of butane C4H10?
2C4H10 + 130,2 --> 8______ + 10H2O
How many molecules of NO2 could be produced from 25 molecules of O3? please explain so I and others could understand how you got the answer (100points)
Further explanation
Given
25 moles of Oxygen(02)
Required The number of molecules
Solution Reaction
2NO+02 → 2NO2
From the equation,
mol NO2: = 2/1 x mol O2 = 2/1 x 25moles = 50 moles
The number of molecules :
[tex] = 50 \times 6.022 \times 10^{23}[/tex]
[tex] = 3.011 \times 10{²5}[/tex]
solutions that are basic are also called what?
Explanation:
A basic solution is an aqueous solution containing more OH-ions than H+ions. In other words, it is an aqueous solution with a pH greater than 7. ... Examples of common basic solutions include soap or detergent dissolved in water or solutions of sodium hydroxide, potassium hydroxide, or sodium carbonate.
Question 3
When an electron absorbs energy and jumps it is:
a negative ion
in the ground state
a positive ion
in the excited state
Help please
Answer:
in the excited state
Explanation:
Because in excited state an atom has more energy
Mole Conversion: How many atoms are in 0.830 moles of gold?
Answer:
4.99 × 10²³ atomsExplanation:
The number of atoms of gold can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 0.83 × 6.02 × 10²³
We have the final answer as
4.99 × 10²³ atomsHope this helps you
Which of these ingredients is important in making plastics?
Answer:
he main ingredient in most plastic material is a derivative from crude oil and natural gas. There are many different types of plastics – clear, cloudy, solid colour, flexible, rigid, soft, etc. Plastic products are often a polymer resin which is then then mixed with a blend of additives (See polymer vs. plastic).
~+lil more info +~
Plastics are made from natural materials such as cellulose, coal, natural gas, salt and crude oil through a polymerisation or polycondensation process. Plastics are derived from natural, organic materials such as cellulose, coal, natural gas, salt and, of course, crude oil.
A reaction between 7.88 grams of element X and 23.12 g of elementy produced a compound called XY.
How many grams of XY were produced?
Answer:
30 g
Explanation:
According to Mendeleev's theory, the total mass of the reactants and products are the same.
A large piece of cork has a density of 0.251 g/cm3 and a volume of 1000.0 cm3. Calculate the mass of the cork.
Answer:
251 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 0.251 × 1000
We have the final answer as
251 gHope this helps you
HELP. ME!!!!!!!!!!!!!!!
Which of the following compounds has the largest percent by mass of oxygen?
Select one:
a. CO2
b. C6H1206
с. СO
d. CH20
givin 11 sodium 23, what is the atomic mass
How many moles of chlorine gas at 120.0°C and 26.1 bar would occupy a vessel of 38.0 L? R = 0.08314 L･bar/mol･K.
Answer:
n = 30.36 mol
Explanation:
Given data:
Temperature of gas = 120.0°C
Pressure of gas = 26.1 bar
Volume of gas = 38.0 L
Number of moles of Cl gas = ?
Solution:
Formula:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.08314 bar.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
120+273 = 393 K
26.1 bar ×38.0 L = n × 0.08314 bar.L/ mol.K × 393 K
991.8 bar.L = n × 32.67bar.L/ mol
n = 991.8 bar.L/ 32.67bar.L/ mol
n = 30.36 mol
The number of moles of chlorine gas at 120.0°C and 26.1 bar that would occupy a vessel of 38.0 L is 30.4moles.
HOW TO CALCULATE NUMBER OF MOLES:
The number of moles can be calculated by using the following formula:PV = nRTWhere;
P = pressure (Bar)T = temperature (K)V = volume (L)n = number of moles (mol)R = gas law constant (0.08314 L･bar/mol･K.)According to this question, chlorine gas at 120.0°C and 26.1 bar would occupy a vessel of 38.0 L. The number of moles can be calculated as follows:T = 120°C + 273 = 393K
26.1 × 38 = n × 0.08314 × 393
991.8 = 32.67n
n = 991.8 ÷ 32.67
n = 30.4moles
Therefore,the number of moles of chlorine gas at 120.0°C and 26.1 bar that would occupy a vessel of 38.0 L is 30.4moles.Learn more at: https://brainly.com/question/13821925?referrer=searchResults
A student holds two iron magnets, one in each hand. the south pole of one magnet is pointed toward the south pole of the other magnet. as the magnets get closer to each other, they will-
A) attract more strongly
B) attract more weakly
C) repel more strongly
D) repel more weakly
When the south pole of one magnet is pointed close to the south pole of another magnet, they will strongly repel each other. Therefore, option (C) is correct.
What is a magnet?A magnet is described as a material that generates a magnetic field and this magnetic field is responsible for the considerable property of a magnet. Properties of a kind of force that pulls ferromagnetic materials, such as iron, cobalt, steel, etc., and attracts or repels other magnetic materials.
A permanent magnet can be defined as an object composed of a material that is magnetized and produces its own magnetic field. This type of material can be magnetized, is strongly attracted to a magnet, is called ferromagnetic, and contain the elements iron, nickel, and cobalt.
Each magnet has a set of North and South poles within them. The south pole of one magnet attracts the north pole of another magnet while similar piles such as the south pole of one magnet repel the south pole of another magnet. Similarly, the North pole of one magnet repels the north pole of another magnet when they get closer.
Learn more about the magnet, here:
brainly.com/question/2841288
#SPJ2
Types of catalyst.....
Plsz.....
Answer:
Explanation:
(1) Homogeneous, (2) Heterogeneous (solid), (3) Heterogenized homogeneous catalyst and (4) Biocatalysts
Consider the molecules H2O, H2S, H2Se, and H2Te. Which do you expect to have the highest boiling point, and why?
a. H2O, because it experiences hydrogen bonding.
b. H2S, because it dissociates and forms ions.
c. H2Se, because it experiences ion-dipole forces.
d. H2Te, because it has the most electrons to form a dipole.
Answer:
a. H20,because it experiences hydrogen bonding.
Answer:
H2O, because it experiences hydrogen bonding.
Explanation:
I got it right
Which of the following is true about sound waves and light waves?
A.
All sound waves and light waves are longitudinal waves.
B.
Most sound waves are transverse waves, while light waves are longitudinal waves.
C.
All sound waves and light waves are transverse waves.
D.
Most sound waves are longitudinal waves, while light waves are transverse waves.
Answer:
Most sound waves are longitudinal waves, while light waves are transverse waves
Explanation:
write the formula of cryolite .
Answer:
[tex]Na_{3} AlF_{6}[/tex]
A chlorine atom has 18 electrons and 17 protons. What is this atom called?
Lesson 5.01
Question 1 options:
negative ion
neutral ion
positive ion
nucleus
Answer:
Negative ion
Explanation:
I took the test
The given atom chlorine contains 18 electrons and 17 protons. It have one electron that dominates over the proton number. Thus it have a negative charge and it is a negative ion.
What are ions?Ions are formed by the lose or gain of electrons from neutral atoms. Atoms are neutral in ground state because they contains equal number of negatively charged particles called electrons and positively charged particles protons.
When atom lose an electron, it gains a positive charge because by the lose of an electron, protons dominate by one. Similarly when atom gain an electron they form negative ions, since one more electron leads one extra negative charge.
The number of electrons in Cl atom is `17. When it gains one electron then one unit of negative charge dominates over the 17 protons. Thus it form a negative ion with 18 electrons.
To find more on ions, refer here:
https://brainly.com/question/1488567
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the more particles a substance has at a given temperature the more thermal energy it has true or false
Answer:
[tex]\huge\boxed{\sf True}[/tex]
Explanation:
Temperature and thermal energy are in a direct proportion which means that if temperature of a substance increases, its thermal energy also increases and vice versa.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807The nutritional recommended daily allowance (rda) of calcium is 1,300 mg for a 9-18-year-old. How many grams is this? How many atoms of calcium is this?
Answer:
1.3 grams and I think the atoms of calcium is 7, 829. 9
Explanation:
hope this helps!
Which two things cause the orbits of planets to be nearly circular?
O A. Inertia
O B. Magnetism
O C. Gravity
O D. Electricity
Answer:
Gravity and inertia
Explanation:
each plant does have magnetism but they are two far away from each other to cause anything to happen. Electricity just dosent make sense.
How many moles are in 150.0 grams of Fe2O3
Answer:
its 150 hope this helps
Explanation:
