The density of hydrogen : ρ = 0.0892 g/L
Further explanationGiven
mass of Hydrogen : 0.446 g
Volume = 5 L
Required
The density
Solution
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
The unit of density can be expressed in g/cm³, kg/m³, or g/L
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
Input the value :
ρ = m : V
ρ = 0.446 g : 5 L
ρ = 0.0892 g/L
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Why is heat needed to get a reaction to occur
Answer:As temperature increases, reactions take place. Generally, higher temperatures mean faster reaction rates; as molecules move about more quickly, reactant molecules are more likely to interact, forming products.
Explanation:
Answer:
Endothermic and Exothermic Reactions
Many familiar chemical reactions, such as the burning of coal, rusting and exploding gunpowder, give off heat; chemists call these reactions exothermic. Because reactions liberate heat, they increase the ambient temperature.
Describe how to use a transfer pipet to deliver 10.00 mL of liquid by placing the steps in the correct order.
This question is incomplete, the complete question is;
Describe how to use a transfer pipet to deliver 10.00 mL of liquid by placing the following steps in the correct order;
- Replace the bulb with your index finger and wipe excess liquid off the outside of the pipette.
- Place the tip of the pipette against the side of the beaker and drain the liquid from the pipette until the bottom of the meniscus reaches the calibration mark.
- Transfer the pipette to the receiving vessel.
- Drain the pipette by gravity while holding the tip against the side of the receiving vessel.
- Use a rubber bulb to suck liquid up past the 10.00 ml calibration mark.
- Suck up a third volume of liquid past the 10.00 ml calibration mark.
- Discard the first two pipette volumes of the liquid to rinse the pipette.
Answer:
- Use a rubber bulb to suck liquid up past the 10.00 ml calibration mark.
- Discard the first two pipette volumes of the liquid to rinse the pipette.
- Suck up a third volume of liquid past the 10.00 ml calibration mark.
- Replace the bulb with your index finger and wipe excess liquid off the outside of the pipette.
- Place the tip of the pipette against the side of the beaker and drain the liquid from the pipette until the bottom of the meniscus reaches the calibration mark.
- Transfer the pipette to the receiving vessel.
- Drain the pipette by gravity while holding the tip against the side of the receiving vessel.
Explanation:
First of all, We use a suction device to suck up liquid into pipet. Then we will fill the pipet up to the 10 mL marks and will discard the initial two volumes of liquid and will take a final third volume. We will replace the bulb with index finger and will drain it by placing the tip of pipet at the wall of beaker and drain the liquid.
Arranged in the following steps correctly;
- Use a rubber bulb to suck liquid up past the 10.00 ml calibration mark.
- Discard the first two pipette volumes of the liquid to rinse the pipette.
- Suck up a third volume of liquid past the 10.00 ml calibration mark.
- Replace the bulb with your index finger and wipe excess liquid off the outside of the pipette.
- Place the tip of the pipette against the side of the beaker and drain the liquid from the pipette until the bottom of the meniscus reaches the calibration mark.
- Transfer the pipette to the receiving vessel.
- Drain the pipette by gravity while holding the tip against the side of the receiving vessel.
On the periodic table, the elements known as noble gases are all found in
Answer:
Group 18 (VIIIa)
Explanation:
please help !!!
What law states that matter can never be created or destroyed?
A. The law of gravity
B. The law of constant phases
C. The law of conservation of matter
D. The atomic theory
Answer:
C) The law of conservation of matter
Explanation:
Conservation means keeping/ retaining something, in this case it is matter. Hope this helps!
For all seawater problems, assume the salinity is 3.5%
If you have a 2000 gram sample of seawater, how many grams of pure water are there?
0.035 x 2000) = x, 2000 - x = pure water
Answer to the nearest WHOLE number.
Answer:
1930g
Explanation:
We have been given that the salinity of sea water is 3.5%;
Now the mass of sea water sample is 2000g
So, problem here is to find the quantity of pure water in the sample = ?
Solution:
Let us find the quantity of the salt in the sample;
Salt content = 3.5% x 2000 = 70g
Amount of pure water = 2000 - 70 = 1930g
2 points
A student saw the Moon rise at 6:20 a.m. on Monday. If he wants to see
the Moon rise again on Tuesday, vhat time should he look in the sky?(Mark
the one best answer.)
About 6:20 am
About 6:20pm
About 5:30 am
About 7:10am
12. What is the volume of 0.07 mol of neon gas at STP?
2 L Ne
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KExplanation:Step 1: Define
0.07 mol Ne (g)
Step 2: Identify Conversions
STP - 22.4 L per mole
Step 3: Convert
Set up: [tex]\displaystyle 0.07 \ mol \ Ne(\frac{22.4 \ L \ Ne}{1 \ mol \ Ne})[/tex]Multiply: [tex]\displaystyle 1.568 \ L \ Ne[/tex]Step 4: Check
Follow sig fig rules and round. We are given 1 sig fig.
1.568 L Ne ≈ 2 L Ne
Write a balanced equation describing the reduction of H2SeO4 by SO2 to produce selenium. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.)
Answer:
[tex]\mathbf{H_2SeO_{4(aq)} + 3SO_{2(aq)} + 2H_2O_{(l) } \to Se_{(s)} + 3H_2SO_{4(aq)} }[/tex]
Explanation:
We are to write a balanced equation from the information given above by including the states of their matter according to SATP conditions;
[tex]\mathbf{H_2SeO_{4(aq)} + 3SO_{2(aq)} + 2H_2O_{(l) } \to Se_{(s)} + 3H_2SO_{4(aq)} }[/tex]
From above;
The oxidizing agent is [tex]\mathbf{H_2SeO_{4(aq)} }[/tex]
The reducing agent is [tex]\mathbf{SO_{2(aq)} }[/tex]
Please help if you know please and thanks ;)
Answer:
it takes two hydrogen atoms for every oxygen atom to produce this reaction, so the mole ratio between hydrogen and oxygen is 2:1
is volcanoes eruption rapid change or slow change
Answer:
Fast change
Explanation:
Weathering, erosion, and deposition are examples of slow change. Earthquakes, erupting volcanoes, and landslides happen fast. Therefore, they can change the Earth's surface very quickly.
If the average atomic mass of hydrogen in nature is 1.0079, what does that tell you about the percent composition of H-1 and H-2 in nature
Answer:
That the isotope H-1 is the most abundant in nature.
Explanation:
Hello!
In this case, since the average atomic mass of an element is computed considering the mass of each isotope and the percent abundance each, for hydrogen we would set up something like this:
[tex]m_H=m_{H_1}*\%abund_{H_1}+m_{H_2}*\%abund_{H_2}[/tex]
Moreover, since the isotope notation H-1 and H-2 means that the atomic mass of H-1 is 1 amu, that of H-2 is 2 amu and the average one is 1.0079 amu, we can infer that the most of the hydrogen in nature is H-1 as the most of it composes the average hydrogen atom.
Best regards!
At equilibrium the reactant and product concentrations are constant because a change in one direction is balanced by a change in the other as the forward and reverse rates become equal: (MTS 5/5/2018) When a chemical system is at equilibrium, Group of answer choices the concentrations of the reactants and products have reached constant values. the concentrations of the reactants are equal to the concentrations of the products. the forward and reverse reactions have stopped. the reaction quotient, Q, has reached a maximum. None of the choices.
Answer:
concentrations of the reactants and products have reached constant values
Explanation:
When a reaction is carried out in a closed system, it attains dynamic equilibrium after sometime. We define dynamic equilibrium as a situation in which the forward and reverse reactions proceed at the same rate.
When this occurs, the concentration of the reactants and products remain fairly constant. Hence the answer.
can you make energy with ionized particles? yes or no and how
How many moles are in 6.3 x 10^22 molecules of H3PO4?
0.10 mol H₃PO₄
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
6.3 × 10²² molecules H₃PO₄
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 6.3 \cdot 10^{22} \ molecules \ H_3PO_4(\frac{1 \ mol \ H_3PO_4}{6.022 \cdot 10^{23} \ molecules \ H_3PO_4})[/tex]Multiply: [tex]\displaystyle 0.104616 \ moles \ H_3PO_4[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
0.104616 mol H₃PO₄ ≈ 0.10 mol H₃PO₄
I really need help with these someone please help me.
3 x 10^4
8 x 10
PLZ HELP ME!!!!!! BEING TIMED!!!!!
Answer:
3 one
Explanation:
convert 0.00028 to scientific notation
Answer:
2.8 x10^-4
Explanation:
The total number of molecules in 34.0 grams of NH3 is equal to
A)
2.00 ~ 6.02 x 1023
B)
1.00 6.02 x 1023
C)
1.00 x 22.4
D)
2.00 ~ 22.4
Answer:
A
Explanation:
Sana makatulong tong answer ko
The total number of molecules in 34.0 g of ammonia is equal to 12.044×10[tex]^23[/tex] molecules according to the concept of Avogadro's number.
What is Avogadro's number?
Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.
In the given example,number of molecules is determined as follows,
17 g ammonia has 6.022×10²³ molecules
So,34 g ammonia has, 34×6.022×10²³/17=12.044×10²³ molecules.
Hence, the total number of molecules in 34 g of ammonia is 12.044×10²³ molecules.
Learn more about Avogadro's number ,here:
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Your question is incomplete, but the most probable answer is 12.044×10²³ molecules.
Two parents who are both Gg (Bb) for a gene are crossed. The genetic makeup of the offspring is that some will be Gg and some gg.
Question 2 options:
True
False
Answer:
false
Explanation:
The genotype of 50% of offspring will be Gg, 25% will be gg, and 25% will be GG. Hence, it is true.
What is a genotype?An organism's genotype is made up of all of its genetic components. The alleles or variations that an individual carries in a specific gene or genetic region are also referred to as the genotype. In other words, it is the genetic makeup of an organism. Phenotypes are determined by genotypes.
There are three different genotype types: homozygous dominant (PP), homozygous recessive (PP), and heterozygous (Pp). Examples of genotypes are hair color, skin color, height, hair texture, and blood group.
When two parents who are both Gg (Bb) for a gene are crossed, then the genotype of their offspring will be GG, gg, Gg. Hence, it is true.
Learn more about genotype, here:
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How many hydrogen atoms are in 5 molecules of isopropyl alcohol, C3H7O ?
Answer:
The answer is "35 atoms".
Explanation:
The Formula for isopropyl alcohol is: [tex]C_3H_8O[/tex]
In 1 molecule of [tex]C_3H_8O[/tex] = 8 atoms of hydrogen
In 4 molecule of = atoms of hydrogen
According to the given formula [tex]C_3H_7O[/tex]
In 5 molecule of [tex]C_3H_7O[/tex] [tex]= 5 \times 7 = 35[/tex] atoms of hydrogen.
1. Which of the following would be an example of spontaneous
generation?
Answer:
This is the idea of spontaneous generation, an obsolete theory that states that living organisms can originate from inanimate objects. Other common examples of spontaneous generation were that dust creates fleas, maggots arise from rotting meat, and bread or wheat left in a dark corner produces mice
Explanation:
hope you like my answer
What is conclusive evidence that mixing sugar in water is a physical change
Explanation:
1) their is no formation of new substance
2) the reaction can be reverse i.e if we heat sugar solution it we give us sugar and water.
please help this is due today which ones are reactive and which arent?
Answer:
I' really don't know I'm sorry
How many moles are in 563.9 grams of arsenic?
Answer:
No. of moles, n = 7.52 moles
Explanation:
Given that,
Mass, m = 563.9 grams
Molar mass of arsenic = 74.92 g/mol
We need to find the number of moles in 563.9 grams of arsenic. Let it is denoted by n. It is equal to given mass divided by total molar mass.
[tex]n=\dfrac{563.9 }{74.92}\\\\=7.52\ \text{moles}[/tex]
So, there are 7.52 moles in 563.9 grams of arsenic.
How does the number of molecules in 1 mol of oxigen compare with the number of molecules in 1 mol of nitrogen?
Answer:
They are the same.
Explanation:
Hello!
In this case, according to the Avogadro's number, we take into account that for molecules such as gaseous oxygen (O₂) and nitrogen (N₂), we realize that 1 mole of these contain 6.022x10²³ moles of molecules; as we are given 1 mol each, we notice they both have 6.022x10²³ molecules, therefore, they number of molecules is the same because they have the same number of moles.
Best regards!
which type of organism carries out cellular respiration
Answer:Prokaryotic cells carry out cellular respiration within the cytoplasm and eukaryotic cells carry out respiration in the mitochondria
Explanation:
Which of these statements is true?
A.The neutrons have a neutral charge and help stabilize an atom
B.The electrons have a negative charge and are in the nucleus
C.The protons have a negative charge and are in the nucleus
D.The electrons have a positive charge and orbit the nucleus in the electron cloud
Answer:
Among these statements B is the correct answer.
Deforestation, intensive agriculture, and drought can result in a condition called
A) urban sprawl
B) land reclamation
C) pollution
D) desertification
Answer:
D
Explanation:
Human activities that contribute to desertification include the expansion and intensive use of agricultural lands, poor irrigation practices, deforestation, and overgrazing. ... Some meteorologists and soil scientists measure the impacts and length of a drought to determine if it is an example of desertification.
An empty Erlenmeyer flask weights 241.3 g. When filled with water (d = 1.00 g cmଷ ⁄ ), the flask and its contents weight 489.1 g. What is the flask’s volume? What is the mass of the flask when filled with chloroform (d = 1.48 g cmଷ ⁄ )?
Answer:
608 g
Explanation:
Mass of flask + contents = 489.1 g
Mass of flask = 241.3 g.
Mass of water = 489.1 - 241.3 = 247.8 g
Density of water = 1.0 g/cm^3
volume of water = 247.8 g/1.0 g/cm^3
Volume = 247.8 cm^3
But
Volume of flask = volume of water
Volume of flask = 247.8 cm^3
volume of chloroform = volume of flask
mass of chloroform = 1.48 g/cm^3× 247.8 cm^3
Mass of flask + chloroform = 366.7 g + 241.3 = 608 g