Answer:
D
Explanation:
****URGENT****
I need help!!!
the answers are there, i need someone to explain please!
Explanation:
your answer was correct
Suggest a way that a scientist could create an even more accurate model of universe expansion
Answer:
Between galaxies, retake the measurement.
Explanation:
Among both galaxies, reiterate the measurements. Instead of utilising a balloon, a scientist might create a model that shows in which everything really is and how cosmos is expanding rather than expanding. By inflating up the atmosphere to 1/2, 3/4, and full size, continue the operation.
PLZ HELP There are two main ways that organisms reproduce, or make more Individuals of their own kind. Which of the following is true of these two types of reproduction?
A. In one way, two parents are involved. In the other, there is only one parent
B. In reproduction that involves only one parent, the offspring are different from the parent. In reproduction that involves two parents, the offspring receive exact copies of the parents' DNA.
C. In both ways, offspring share characteristics with their parents but are not exactly the same. O
D. In both ways, all offspring are identical to each other but maji different from their parents.
Answer:
A
Explanation:
Two parents are involved in Sexual Reproduction but only one is involved in Asexual Reproduction.
A sample of a gas is kept at constant pressure while
its temperature is cooled from 100°C to 0°C. What
was its original volume if its final volume is 1.83 L?
Explanation:
here's the answer to your question
hii pls help me to balance the equation thanksss
Answer:
3Fe(s)+2O2(g)---->Fe3O4
this way you will have 3irons on both sides and 4 oxygens.
I hope this helps
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
[tex]\boxed{\pmb{\red{\sf{3Fe(s) + 2O_{2}(g)\dashrightarrow Fe_{3}O_{4}(s)}}}}[/tex]
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
How many electrons are in an ion of sulfur (82)?
The Periodic Table
O A. 2
B. 16
O
C. 8
D. 18
Answer:
B 16
Explanation:
the atomicnumber =protons of the atom =electrons do keep in mind that they are charged negatief
Need help with this
Answer:
H20is water andN20is nitrogen 4 oxide
Urgent please help
A.Ca
B. CaO
C.CO
3. Determine the pH value for calcium hydroxide, Ca(OH), with concentration of
0.05 mol dm3. [pH + pOH = 14).
Explanation:
Ca(OH) is a base
pOH = -Log[OH]
[OH] = 0.05
pOH = -Log(0.05)
pOH = 1.3
pH + pOH = 14
pH = 14 - pOH
pH = 14 - 2
pH = 12.7
Which statement describes the periodic law?
Help please now!
Answer:
Answer is: elements in the same group have similar chemical properties. Periodic law is the arrangement of the elements in order of increasing atomic number.
what are the main tybes of mixture
Answer:
salt and oil
water and salt
water and sugar
Explanation:
2HNO3+ Cu O -> Cu (NO3)2 + H₂O
Answer:
it is already balanced bro
What are the characteristics of ionosphere?
Explanation:
The ionosphere is a shell of electron and electrically charged atoms and molecular that surrounds, the earth.
A Questic
Is the following reaction feasible at 340K? Mg + ZnO -> MgO + Zn Enthalpy Data: Mg: 0 kJ/mol ZnO: -348 kJ/mol MgO:-602
kJ/mol Zn: 0 kJ/mol Entropy Data: Mg: 33 J/K mol ZnO: 44 J/K mol MgO: 42 J/K mol Zn: 27 J/K mol
A. No, it is not feasible because the Gibbs free energy change is negative.
OB. Yes, it is feasible because the Gibbs free energy change is negative.
C. No, it is not feasible because the Gibbs free energy change is positive.
D. Yes, it is feasible because the Gibbs free energy change is positive.
Answer:
No, it is not feasible because the Gibbs free energy change is positive
Explanation:
∆Hreaction= (-602 KJ/mol) - (-348 KJ/mol) = -254 KJ/mol
∆Sreaction = (42 + 27) J/Kmol - (33 + 44) J/K = -8J/Kmol
From;
∆G = ∆H - T∆S
∆G = 254 × 10^3 J/mol - [340K × (-8 J/Kmol)]
∆G = 2.57 × 10^5 J/mol
Note that when the change in free energy is positive, a reaction is non spontaneous. Only a reaction that has a negative change in free energy is spontaneous.
Answer:
B. Yes, it is feasible because the Gibbs free energy change is negative.
Explanation:
I passed the exam 100/100
3 point different between reactant and product
Answer:
reactants
The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction
Explanation:
product_The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction. In the equation above, the zinc and sulfur are the reactants that chemically combine to form the zinc sulfide product.
There is a standard way of writing chemical equations. The reactants are all written on the left-hand side of the equation, with the products on the right-hand side. An arrow points from the reactants to the products to indicate the direction of the reaction:
reactants → products
Reactants
1. The substances used as starting materials and which react with one another are reactants.
2. Example: In this reaction Mg and O2 are reactants.
Products
1. The substances which are formed as a result of reaction are products.
2. Example: In this reaction MgO is a product.
Jane wants to study how a person's heart and lungs respond to intense
exercise. She measures the heart rate and breathing rate of 10 people before,
during, and after a 5K race. Which body systems is she studying?
A. Cardiovascular and respiratory
B. Skeletal and urinary
C. Digestive and nervous
D. Muscular and reproductive
SUBMIT
A sample of oxygen gas has a volume of 453.7 mL when its pressure is 0.435 atm. What will the volume of the gas
be
at a pressure of 0.88 atmospheres, if the temperature remains constant?
Answer:
is you'r question correctly?
or not
plz solve the question and send the answer
I will give u branist n like u and even follow u back plz help me
Answer:
P¹V¹/T¹=P²V²/T² here
P²= 1.25- atm
V²=?
T²=345K
P¹=0.75-atm
V¹=120
T¹=295K
So V²= (0.75 x120/295)x(345/1.25)
Volume of the gas V²= 84.20- ml
Answer:
Solution given:
at first
volume[tex]V_{1}=120.0ml[/tex]
pressure [tex]P_{1}=0.75atm[/tex]
temperature [tex]T_{1}=22+273=295°K[/tex]
after increasing temperature and pressure
volume[tex]V_{2}=xml[/tex]
pressure [tex]P_{2}=1.25atm[/tex]
temperature [tex]T_{2}=70+273=343°K[/tex]
now
By using Combined gas equation[tex]\frac{P_{1}V_{1}}{T_{1}}=\frac{P_{2}V_{2}}{T_{2}}[/tex]
substituting value
[tex]\frac{0.75*120}{295}=\frac{1.25*x}{343}[/tex]
0.305=5x/1372
Doing criss cross multiplication
5x=0.305*1372
x=418.46/5
x=83.69ml
x=84ml
the volume will be 84ml
please solve this question
Answer:
b) it gets accumulated in the respiratory system which then halts or slows down the supply of oxygen to the brain hence leading to death
3g of clean mg ribbon and 8g of clean copper metal was burnt separately in equal volume of air and both mass reacted completely with air state and explain where they was greater change in mass??
Answer:
gshshs
Explanation:
bshsjskskehhshs
The copper metal is heated in the air. The magnesium ribbon emits a brilliant light and magnesium oxide, which is white. When oxygen is passed over copper (in the presence of heat), an oxidation reaction occurs, resulting in the formation of black copper oxide. The greater change in mass observed when they start to burned.
What is copper metal ?Copper is a mineral and an element that is essential to our daily lives. It is a significant industrial metal due to its high ductility, malleability, thermal and electrical conductivity, and corrosion resistance. It is a necessary nutrient in our diet.
Metals are a class of materials that have high electrical and thermal conductivity, as well as malleability, ductility, and high light reflection. Copper (Cu), aluminium (Al), and other metals are examples.
The combustion of magnesium ribbon is a combined reaction. This is due to the fact that magnesium reacts with oxygen to form the single product magnesium oxide. When magnesium ribbon is burned in air, it reacts with the oxygen in the air to form magnesium oxide.
Thus, 3g of clean mg ribbon and 8g of clean copper metal were burnt separately in equal volume of air and both mass reacted completely with air the greater change in mass observed when they start to burned.
To learn more about copper metal, follow the link;
https://brainly.com/question/11992235
#SPJ2
which of the following represents a beta particle?
Answer:
[tex]{ \sf{A. \: \: { _{ - 1}{}^{0} e }}}[/tex]
A beta particle is an electron.
Explanation:
[tex]{ \tt{ {}^{4}_{2}He \: \: is \: an \: alpha \: particle.}} \\ { \tt{ \gamma \: \: is \: gamma \: rays}} \\ { \tt{ \alpha \: is \: same \: as \: alpha \: particle}}[/tex]
The beta particles are the high energy electron radiations, with the representation as as [tex]\rm ^0_{-1}e[/tex].
What are nuclear reaction radiations?The nuclear radiations result in the release of the mass in the form of varying types of particles. The particles ejected in nuclear reaction are alpha, beta, or gamma particles.
Beta particles are high energy particles with the presence of negative charge with the loss of electron.
The beta particle can be represented as [tex]\rm ^0_{-1}e[/tex]. Thus, option A is correct.
Learn more about beta particles, here:
https://brainly.com/question/1685421
Assertion: Atomic mass of aluminium is 27 Reason: An atom of aluminium is 27 times heavier than 1 / 12th of the mass of the C – 12 atoms.
Answer:
i is the correct answer.
Explanation:
the RAM of aluminum is indeed 27. And since the RAM of substances are measured in terms of the C-12 isotope then R indeed explains why the RAM Al is 27.
PLZ HELP what is a sign that a chemical change has happened
Answer:
Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Arrange the steps in order to describe how photons and carbon dioxide (CO2) contribute to the warming of Earth.
CO2 in the atmosphere absorbs infrared
photons.
CO2 in the atmosphere emits infrared photons back toward Earth.
Photons from the Sun strike Earth and become infrared photons.
Earth radiates infrared photons into the atmosphere
The Sun radiates sunlight (visible)
photons
The Sun radiates sunlight (visible) photons
Photons from the Sun strike Earth and become infrared photons.
Earth radiates infrared photons into the atmosphere
CO2 in the atmosphere absorbs infrared photons.
CO2 in the atmosphere emits infrared photons back toward Earth.
Certain gases are known to contribute towards global warming. Such gases are called greenhouse gases. The infrared rays from the sun are absorbed by these gases as they are re-emitted from the earth and re-emitted.
The sun radiates photons to the earth which is re-radiated into outerspace from the earth's surface. CO2 and other greenhouse gases absorbs these gases and re-emit them to the earth thereby causing a gradually rise in the temperature of the earth called global warming.
https://brainly.com/question/16148572
For the metal Mg 109.5g solution HCl 10%. a) Case of metal b) Its properties
Answer:
Explanation:
mg +2hcl=mgcl2 +h2
mhcl=10.95g
nhcl==0.3
nmg=1/2nhcl=0.15
mMg=3.6g
m mgcl2=14.25
Aluminum hydroxide containing medicine is used for gastric why
Answer:
Aluminum Hydroxide, Magnesium Hydroxide are antacids used together to relieve heartburn, acid indigestion, and upset stomach. They may be used to treat these symptoms in patients with peptic ulcer, gastritis, esophagitis, hiatal hernia, or too much acid in the stomach (gastric hyperacidity).
Answer:
wow it's a very nice question
What’s is inside a cell? Crossword puzzle
ACROSS
2.package materials from the endoplasmic reticulum & send them to other parts of the cell
4.breaks down food & old cell parts
7.a stiff layer of nonliving material that surrounds a plant cell
8.jellylike material found within the cell membrane
10.found in plant cell; captures the sun’s energy to make food
12.genetic materials that carry information about the organism
13.moves materials throughout the cell
DOWN
1.produce proteins for the cell
3.a tiny structure inside a cell
5.controls all of the cell’s activities
6.produce most of the cells energy
7.controls substance that enter and leave the cell
9.creates ribosomes; found inside the..
11.stores water and waste inside the cell
breaking larger molecules into smaller molecules and carbon
Answer: catabolism
Explanation:
Catabolism refers to the set of metabolic pathways which is necessary for the breaking down of molecules into smaller units. This is then oxidized for the release of energy or can be used to perform other anabolic reactions.
Catabolism is regarded as the opposite direction of anabolism which is simply the building-up of molecules. It should be noted that anabolism and catabolism work together in every living organisms and perform functions such as the production of energy and the repair of cells.
You go fishing and obtain some lead weights for your trip. Since you are the smartest chemistry student
in the land, you know that lead's density is 11.34 g/mL. If there are 50 weights in a 250. mL box, what is
the mass of each weight?
Pls show work if u can!
Answer:
56.7g
Explanation:
Density = mass/volume
According to this question, some lead (Pb) of certain weights was obtained on a fishing trip. The density of lead is given as 11.34g/mL. If the 50 weights are placed in a 250. mL box, the mass of the lead are as follows:
Density = mass ÷ volume
11.34g/mL = mass/250mL
mass = 250 × 11.34
mass = 2835g
Since the 50 weight of lead weighs 2835g, then the mass of each weight is calculated as follows:
= 2835/50
= 56.7g
What is the chemical formula of potassium manganate vii
Answer:
Explanation:Visit this site for any assignments assistance
https://eiwriter.com/
