Answer:
The middle hydrogen is bonded to 2
elements.
Each hydrogen must be bonded to one element which is oxygen
Answer:
A, C, and D
Explanation:
15
Select the correct boxes.
Which two elements have the same number of valence electrons?
Element
Atomic Number
barium
56
neon
10
silicon
14
carbon
6
Reset
Reset
Next
Answer:
barium and silicon has same valence electrons
Explanation:
barium-2,8,18,18,8,2
neon-2,8
silicon-2,8,2,2
carbon-2,4
Answer: both barium and silicone
Explanation:
it was an my exam
Can someone help me with this??
ﾟ+*:ꔫ:*﹤ ﹥*:ꔫ:*+ﾟAnswer:ﾟ+*:ꔫ:*﹤ ﹥*:ꔫ:*+ﾟ
The following: Jupiter, Saturn, Uranus, or Neptune.
ﾟ+*:ꔫ:*﹤ ﹥*:ꔫ:*+ﾟExplanation:ﾟ+*:ꔫ:*﹤ ﹥*:ꔫ:*+ﾟ
any of the planets Jupiter, Saturn, Uranus, and Neptune whose orbits lie beyond the asteroid belt.
Answer:
it is Saturn
Explanation:
and outer planter is just a planet outside the asteroid belt
Isotopes of the same element have a different number of ______
Answer:
atomic weight..................
In an exothermic reaction, what happens to the surroundings?
O A. The temperature decreases.
B. The activation energy is restored.
C. The temperature increases.
D. The thermal capacitance is increased.
Additional Practice Questions
6. If you dissolve 2.31 g of barium hydroxide into 250 mL of water and the barium hydroxide is fully ionized, what will
your resulting pH be?
pH of solution = 13.033
Further explanationGiven
2.31 g Ba(OH)₂
250 ml water
Required
pH of solution
Solution
Barium hydroxide is fully ionized, means that Ba(OH)₂ is a strong base
So we use a strong base formula to find the pH
[OH ⁻] = b. Mb where
b = number of OH⁻ /base valence
Mb = strong base concentration
Molarity of Ba(OH)₂(MW=171.34 g/mol) :
[tex]\tt M=\dfrac{mol}{L}=\dfrac{2.31~g\div 171.34~g/mol}{0.25~L}\\\\M=0.054[/tex]
Ba(OH)₂ ⇒ Ba²⁺ + 2OH⁻(b=valence=2)
[OH⁻]= 2 . 0.054
[OH⁻] = 0.108
pOH= - log 0.108
pOH=0.967
pOH+pH=14
pH=14-0.967
pH=13.033
Lab: Boyle's Law lab report help!
Answer:
it might be wrong but just copy and paste it
Explanation:
hehe ✋
how can you tell which compound in a solution is the solvent?
(own words please)
Answer:
The way you can know which compound in a solution is a solvent is by usually just determining which substance is a solute and which is a solvent. The solute is when it is dissolved and it takes on the characteristics of the solvent.
Explanation:
Hope this helps!
3. Give difference: Mass and Weight
Answer and Explanation:
Your mass is the same no matter where you go in the universe; your weight, on the other hand, changes from place to place. Mass is measured in kilograms; even though we usually talk about weight in kilograms, strictly speaking, it should be measured in newtons, the units of force. (according to cosmicmagazine.com)(not my writing or explanation)
How much will a student earns in 19 weeks if she works for 5 hours each week at a rate of $7 / hour?
Answer:
665
Explanatio
Answer:
$665
Explanation:
5 hours per week × $7 per hour = $35 per week
$35 per week × 19 weeks = $665
what is the mass of of 3.20 X 10^23 particles of Co2?
Answer:
Mass = 23.36 g
Explanation:
Given data:
Number of particles of CO₂ = 3.20 ×10²³
Mass of CO₂ = ?
Solution:
1 mole contain 6.022×`10²³ particles,
3.20 ×10²³ particles × 1 mol / 6.022×`10²³ particles
0.531 mol
Mass of CO₂:
Mass = number of moles × molar mass
Molar mass = 44 g/mol
Mass = 0.531 mol× 44 g/mol
Mass = 23.36 g
Oxygen Molecules taken in per breath: The Athletes result will be?
Answer:
Explanation:
the answer is higher because there is more exercise that makes it higher
hope this helps
How many moles are equal to 9.03x10^24 molecules of water (H20)?
15.0 mol H₂O
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
BracketsParenthesisExponentsMultiplicationDivisionAdditionSubtractionLeft to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
9.03 × 10²⁴ molecules H₂O
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 9.03 \cdot 10^{24} \ molecules \ H_2O(\frac{1 \ mol \ H_2O}{6.022 \cdot 10^{23} \ molecules \ H_2O})[/tex]Multiply/Divide: [tex]14.995 \ mol \ H_2O[/tex]Step 4: Check
Follow sig figs rules and round. We are given 3 sig figs.
14.995 mol H₂O ≈ 15.0 mol H₂O
why do you wash lead (II) sulfate with distilled water in the preparation of lead sulfate?
Answer:
Explanation:
Mineral
The naturally occurring mineral anglesite, PbSO4, occurs as an oxidation product of primary lead sulfide ore, galena.
Basic and hydrogen lead sulfates
A number of lead basic sulfates are known: PbSO4·PbO; PbSO4·2PbO; PbSO4·3PbO; PbSO4·4PbO. They are used in manufacturing of active paste for lead acid batteries. A related mineral is leadhillite, 2PbCO3·PbSO4·Pb(OH)2.
At high concentration of sulfuric acid (>80%), lead hydrogensulfate, Pb(HSO4)2, forms.[4]
Chemical properties
Lead(II) sulfate can be dissolved in concentrated HNO3, HCl, H2SO4 producing acidic salts or complex compounds, and in concentrated alkali giving soluble tetrahydroxidoplumbate(II) [Pb(OH)4]2− complexes.
PbSO4(s) + H2SO4(l) ⇌ Pb(HSO4)2(aq)
PbSO4(s) + 4NaOH(aq) → Na2[Pb(OH)4](aq) + Na2SO4(aq)
Lead(II) sulfate decomposes when heated above 1000 °C:
PbSO4(s) → PbO(s) + SO3(g)
What is unique about the way that transition metals form compounds?
a. They don't form compounds
C. They can form bonds with the electrons in the
two outer-most shells
b. They are the most reactive
d. They can donate all of their electrons
Answer:
A. They don't form compounds
Explanation:
High density: The strong bonding between the atoms in transition metals cause them to be tightly held together, creating a high density. Colored compounds: Transition metals tend to form more colored compounds than other elements, either in solid form or dissolved in a solvent.Answer:
they can form bonds with the electrons in the two outer most shells
If there are 50 grams of a radioactive element how much will be present after 1,2, and 3 half lifes
Answer:
6.25
Explanation:
Removing tropical rain forests has a _____ effect on climate.
a. warming
b. cooling
An erupting volcano has a _____ effect on climate.
a. cooling
b. warming
Answer:
1. a) warming
2. a) cooling
Explanation:
1. Deforestation leads to more carbon dioxide and less oxygen in the atmosphere, because trees are in charge of taking in CO2 and releasing O2. More of the sun's radiation is reflected back to Earth if there's more CO2 in the atmosphere, which is why it has a warming effect on climate.
2. During a volcanic eruption, a volcano releases ash or dust particles that shade sunlight, which causes temporary cooling. The smallest particles can stay in the stratosphere for months, blocking sunlight, causing a long cooling effect on climate.
During the process of condensation, water vapor does what
Answer: the water molecules become more organized and heat is released into the atmosphere as a result.
Explanation:
Calculate the percentage by mass in each element
N in NH3
Answer:
82.35%.
Explanation:
Mass of 1 molecule of ammonia
NH₃ = 14+3(1)
= 17
Calculating percentage by mass of N.
[tex]\%=\dfrac{\text{Mass of Nitrogen atom}}{\text{Mass of ammonia molecule}}\times 100[/tex]
[tex]\%=\dfrac{14}{17}\times 100\\\\=82.35\%[/tex]
So, the required percentage is 82.35%.
how is mathematics utilized in performing science
Answer:
Mathematics is used in Physical Science to calculate the measurements of objects and their characteristics, as well as to show the relationship between different functions and properties. Arithmetic, algebra and advanced mathematics may be used.
Explanation:
In a lab, a student calculates the density of a piece of silver to be 8.74 g/cm3. The actual density of silver is 10.49 g/cm3. What was the student's percent error? Round your answer to 1 decimal place and be sure to include units
Answer:
16.7%
Explanation:
From the question given above, the following data were obtained:
Measured density = 8.74 g/cm³
Actual density = 10.49 g/cm³
Percentage error =?
The percentage error of the student can be obtained by using the following formula:
Percentage error = | measured – Actual | / Actual × 100
Percentage error = | 8.74 – 10.49 |/10.49 × 100
Percentage error = 1.75 / 10.49 × 100
Percentage error = 16.7%
Therefore, the percentage error of the student is 16.7%
Now that you know the molar mass of the
empirical formula, you can divide it into the molar
mass of your compound to find the scaling factor.
What is the scaling factor if the molar mass of
this compound, having an empirical formula of
CH20, is 150 g/mor?
The molecular formula C₅H₁₀O₅ and The scaling factor =5
Further explanationGiven
Molar mass = 150 g/mol
The empirical formula = CH₂O
Required
The scaling factor
Solution
The empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
n = the scaling factor
(CH₂O)ₙ=150 g/mol
(12+2+16)ₙ=150
(30)ₙ=150
n=5
The molecular formula : C₅H₁₀O₅
The size of atoms can be measured using the diffraction of x-rays. Measurements of atomic size confirm that trends can be identified based on location on the Periodic Table of the Elements. Which group of elements is listed in order of decreasing size?
(A.) iodine, bromine, chlorine, Zinc
(B.) boron, carbon, nitrogen, oxygen
(C.) sodium, potassium, rubidium, cesium
(D.) phosphorous, selenium, iodine, radon
Answer:B is the answer I thinn
Explanation:I think !!
Atoms of which pair of elements will form covalent bonds in a compound?
O A. Li and Br
O B. P and CI
O c. Ti and o
D. Ti and Ni
Answer:
B. P and Cl
Explanation:
50 points
Naturally occurring silver is composed of two isotopes: Ag-107 is 51.35% with a mass of 106.905092 amu, and the rest is Ag-109 with a mass of 108.9044757 amu. Calculate the average atomic mass of silver.
Answer:
I'm posting this so I can tell all of you that we should help him together in the comments because it seems we need more than one person to help him
what are synthetic materials, how are they made, and why are they important?
Answer:
Synthetic fibers are made from synthesized polymers of small molecules. The compounds that are used to make these fibers come from raw materials such as petroleum-based chemicals or petrochemicals. These materials are polymerized into a chemical that bonds two adjacent carbon atoms.
Over time, repeated cycles of heating and cooling can cause a rock to crack. The rock may then break into smaller pieces. What is this process called?
A student wrote a chemical equation as shown.
Fe2O3 + 3H2 → Fe + H2O
What should the student do to balance the equation?
A. Add a coefficient 2 before Fe and a 3 before H2O
B. Add a coefficient 3 before Fe and a 2 before H2O
C. Add a coefficient 4 before Fe and a 5 before H2O
D. Add a coefficient 5 before Fe and a 4 before H2O
Answer:
A
add a coefficient 2 before Fe and a 3 before H2O
Answer:
Option A. Add a coefficient 2 before Fe and a 3 before H2O
Explanation:
Fe₂O₃ + 3H₂ —> Fe + H₂O
The above equation can be balance by as follow:
Fe₂O₃ + 3H₂ —> Fe + H₂O
There are 2 atoms of Fe on the left side and 1 atom on the right side. It can be balance by putting 2 before Fe as shown below:
Fe₂O₃ + 3H₂ —> 2Fe + H₂O
There are 3 atoms of O on the left side and 1 atom on the right side. It can be balance by putting 3 before H₂O as shown below:
Fe₂O₃ + 3H₂ —> 2Fe + 3H₂O
Now the equation is balanced.
Thus, the student should add a coefficient 2 before Fe and a 3 before H2O
Scientist use alternative ways to seek out if a fault is active which one isn't include
Answer:
Geologists commonly consider faults to be active if there has been movement observed or evidence of seismic activity during the last 10,000 years. Active faulting is considered to be a geologic hazard - one related to earthquakes as a cause.
Explanation:
Plz mark brainliest thanks
whats the importance of stoichiometry?
please write it in ur own words
Answer:
It helps you predict how much of a reactant participates in a chemical reaction
Explanation:
How many grams of K2SO4 are in:
Answer:
174.2 grams
Explanation:
This compound is also known as Potassium Sulfate.
The SI base unit for amount of substance is the mole.
1 mole is equal to 1 moles K2SO4, or 174.25 grams.
