Answers
Answer:
Three chemical elements: hydrogen, oxygen, and helium.
The difference between metals and metalloids is: metalloids have properties in between those of the metals and non-metals and are semiconductors.
The periodic table is organized by the elemts atomic number, it goes from the element with the lowest atomic number (which is hydrogen) to the element with the highest atomic number (oganesson)
Explanation:
Hope this helps :)
Answer: Thank you for the points.
Explanation:
Related Questions
What type of decay does Am-241 undergo to become Np-237?
a. Alpha decay
c. Positron emission
b. Beta decay
d. Electron capture
Answers
The type of decay that Am-241 undergoes to become Np-237 is alpha decay. The correct option is a.
What is alpha decay?Alpha decay is a type of decay or transformation in which a nucleus emits an alpha particle and change into different atomic nuclei. The atomic number reduces by 2 and the mass is reduced by 4.
Am-241 is an isotope of the chemical element americium. It is a radioactive element and its radioactive decay period is 432.2 years. It is used in the testing of machinery.
When the nucleus of Am changes or emits a radioactive particle. It converts into Np-237. The process is called alpha decay. The atomic mass is reduced by four, and the 241 converts into 237, which become neptunium.
Thus, the correct option is a. Alpha decay.
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Which properties describe the elements in group 18?
Answers
which process helps guarantee that a species continues to involve over hundreds of years?
A. growth
B. nutrition
C. reproduction
Answers
Answer:
C. reproduction
Explanation:
A chemical reaction can theoretically produce 137.5 grams of product, but it actually produced 112.9 grams. Which is the percent yield for this reaction? AKS 4f
Answers
Answer:
Explanation:
Zoom in we can't see it dude
explanation: actual yield - theoretical yield x 100%
112.9-137.5x100%= 26.6%
PLS ANSWER FAST WILL GIVE BRAINLY!!!!
dissolving sugar into coffee is a chemical change
true or false
Answers
2. Have you ever seen a natural event that surprised
you? Why was it surprising?
Answers
Answer:
I have seen many lightning storms before. However, one of the most surprising ones was when I was at my house. It was around midnight when I awoke from the sound of lightning in the distance. I was also half awake so this could be another reason this was the most surprising, but lightning struck near my area. i could see the light through my curtains and the sound was loud enough to awake everyone in my house, even the deep sleepers. I practically jumped out of bed.
For the autoionization of water at 25°C, H2O(l) <---> H+ (aq) + OH-(aq)
Kw is 1.0 X 10^-14. What is (Delta Gº) for the process?
Answers
Answer:
ΔG° = 80 Kj/mole
Explanation:
ΔG° = -R·T·ln(Kw)
R = 0.008314 Kj/mol·K
T = 25°C = 298K
Kw = 1 x 10⁻¹⁴
ΔG° = -R·T·ln(Kw) -(0.08314Kj/mol·K)(298K)ln(1 x 10⁻¹⁴)
= -(0.008314)(298)(-32.2)Kj/mole
= 79.78Kj/mole ≈ 80Kj/mole (1 sig.-fig.)
The change in free energy for the autoionization of water at 25°C is -79.9 KJ
Using the formula;
ΔG = -RTlnK
ΔG = change in free energy = ?
R = gas constant = 8.314 J/K/mol
T = temperature = 298 K
K = equilibrium constant = 1.0 X 10^-14
Substituting into the given formula as;
ΔG = - (8.314 J/K/mol × 298 K × ln(1.0 X 10^-14))
ΔG = -7.99 × 10^4 J/mol or -79.9 KJ/mol
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Which of the following is the conjugate base of HPO42-?
Answers
Answer:
A. PO4^3-
Explanation:
took the quiz on a pex
The conjugate base of HPO₄²⁻ is PO₄³⁻. Therefore, option (A) is correct.
What is the Bronsted-Lowry concept?The Bronsted-Lowry concept can be explained as an acid-base reaction where base and acid react with each other and by an exchange of proton acid, forms its conjugate base and the base generates its conjugate acid.
The Bronsted-Lowry theory is an extended version of Arrhenius's theory of acid-base. According to this concept, acid can be defined as a substance that donates a hydrogen ion or a proton and produces its conjugate base and the base can be defined as a substance that accepts a proton and creates its conjugate acid.
Bronsted-Lowry acid in the dissociation form can be represented as:
Acid ⇄ Conjugate base + H⁺
The conjugate base of Bronsted-Lowry acid HPO₄²⁻ can be represented as follows:
HPO₄²⁻ ⇄ PO₄³⁻ + H⁺
Therefore, PO₄³⁻ is the conjugate base of the Bronsted-Lowry acid HPO₄²⁻.
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During the daytime, we can see things because the sun is giving off
heat energy
light energy
sound energy
electrical energy
Answers
Answer:
light energy
.................
Answer:
light energy
Explanation:
heat does not effect how we see
the sun does not have sound
electrical energy does not effect how we see
Which of the following statements is true? Running an electric current through a magnet can create a magnetic field, Electrons are found in the nucleus of an atom, The strength of a magnetic field increases with distance, Electric engines change electricity into magnestism
Answers
Answer:
running an electric current through a magnet can create a magnetic field
A clownfish uses a sea anemone as a safe place to live. While living there, the clownfish lures in food for the anemone. This is an example of what type of relationship?
Answers
PLEASE HELP!!!!!!!! I DO NOT UNDERSTAND
Answers
Answer:
A, B, C
Explanation:
Explanation
connect them please, dont guess ill give brainiest to the FIRST answer + 29 points
Answers
Answer:
I cant see it sorry
Explanation:
Post another one
When an atom loses an electron, the resulting charge on the atom is ____
Answers
Answer:
Positive
Explanation:
The atom will gain a positive charge by losing an electron
Answer:
cation
Explanation:
What drives the flow of energy in cycling of matter in the atmosphere
Answers
La leche se considera un alimento basico por su elevado contenido de nutrientes su densidad es de 1,4g/ml. Si se hace una compra de 7 bolsas de leche cada una con un volumen de 900m cual es la masa total de la leche expresada en kilogramos?
Answers
Answer:
8.82 kg es la masa total de leche
Explanation:
Consideraremos que el volumen de cada bolsa de leche es de 900 mL.
Sabiendo que tenemos en total 7 bolsas, el volumen final en litros que tenemos disponible es de:
900 mL . 7 = 6300 mL
Utilizando la densidad podemos calcular la masa de leche que tenemos en el total de las 7 bolsas
Densidad = masa / volumen
Densidad . volumen = masa → 1.4 g/mL . 6300 mL = 8820 g
Convertimos la masa de gramos a kg
8820 g . 1 kg /1000g = 8.82 kg
Obtaining crude oil for refining is an example of
A. Constructive occupation
B. Extractive occupation
C. Manufacturing occupation
D. Tertiary occupation
E. Service occupation
Answers
Answer:
B: extractive occupation
how many chemical bonds are in glucose?
Answers
Answer:
4 covalent bonds
Explanation:
If you try to place the compound on the pan over the flame, what could possibly happen? Explain your answer. [2 marks] anyone please help me!!:(
Answers
Answer:
it will probably flame up or explode or maybe start boiling
In a combustion reaction, pentane (molar mass (MM) = 72.17 g/mol) burns, in the presence of oxygen (MM = 32.00 g/mol), to produce carbon dioxide (MM = 44.01 g/mol) and water (MM = 18.02 g/mol).
The balanced reaction is shown here: C5H12 (l) + 8 O2 (g) à 5 CO2 (g) + 6 H2O (g)
If 4.0 mol of O2 is available, what is the maximum number of moles of water that can be produced (AKS 4f)?
A.
3.0 mol
B.
4.0 mol
C.
5.0 mol
D.
8.0 mol
E.
2.0 mol
Answers
The maximum number of mole of water that can be produced is 3 moles (Option A)
Balanced equationC₅H₁₂ + 8O₂ —> 5CO₂ + 6H₂O
From the balanced equation above,
8 moles of O₂ reacted to produce 6 moles of H₂O
How to determine the mole of water producedFrom the balanced equation above,
8 moles of O₂ reacted to produce 6 moles of H₂O.
Therefore,
4 moles of O₂ will react to produce = (4 × 6) / 8 = 3 moles of H₂O.
Thus, we can conclude that the maximum mole of water produced is 3 moles
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3. Convert 273.0 g of lead into moles.
Answers
Answer:
1.3175675675675604
Explanation:
does this need to be rounded?
The equation below shows the decomposition of lead nitrate. How many molecules of PbO are produced when 11.5 g NO2 is formed?
2Pb(NO3 )2 (s) → 2PbO(s) + 4NO2 (g) + O2 (g)
Answers
7. A sample of helium gas occupies a volume of 24.6 L at 2.20 atm. What would its volume be at 3.50 atm?
Answer: 15.5L
Please show your work
Answers
so, here's your answer, 15.5L (appr)
Which of the following is considered parasitism?
a
A hummingbird pollinating a flower.
b
A flea is sucking the blood from a dog.
c
A spider builds its web in a tree.
d
A bug hitches a ride on your backpack during a hike.
Answers
How many mililiters are in 0.5000 liters?
Question 6 options:
50 ml
500 ml
0.5000 ml
5,000 ml
Answers
help me with this pleasee
Answers
HELPP ILL GUVE YOU LOTS OF POINTS EVERYTHING U WANT I REALLY NEED HELP
Answers
Answer:
but what is your question? it's just like the moon going around earth while earth along with all the other planets revolve around the sun
Explanation:
A mixture of Oxygen and Hydrogen occupies a pressure of 101.3kPa. The pressure of Hydrogen is 56kpa. Calculate the pressure of oxygen.
Answers
Answer:
45.3 KPa
Explanation:
From the question given above, the following data were obtained:
Total pressure (Pₜ) = 101.3 KPa
Pressure of Hydrogen (Pₕ) = 56 KPa
Pressure of Oxygen (Pₒ) =?
The pressure of oxygen in the mixture can be obtained as follow:
Pₜ = Pₕ + Pₒ
101.3 = 56 + Pₒ
Collect like terms
101.3 – 56 = Pₒ
Pₒ = 45.3 KPa
Thus, the pressure of oxygen in the mixture is 45.3 KPa
When Na2O is mixed with Mn(NO3)4 it forms NaNO3 and MnO2. We start with 25.0 g
of sodium oxide and 56.1 g of manganese (IV) nitrate.
How many grams of sodium nitrate can be produced?
Answers
WDYT a mixture is? Please help
Answers
Answer:
A mixture is when two substances are physically combined and can be taken apart.
Explanation:
my words