Answer:
1. A claim
2. B evidence
How do you develop a good hypothesis?
Answer:
In order to develop a healthy, working hypothesis it's best to work within the lines of: If _______, Then ______, as an act of if, being the input (independent) variable and then being the output (dependent).
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Answer:yyyyyyyyyeeeeeeetttttt you will figure it out
Explanation:
What volume is occupied by 0.34 moles of Helium gas?
Answer:
I will assume that you mean
STP (Standard Temperature and Pressure)
21
3
≈
7 L
Explanation:
Since we know that
1 mole
of an ideal gas occupies
22.4 L
at
STP
then can establish the following relationships:
22.4 L
1 mole
or
1 mole
22.4 L
Knowing that, we can solve for the volume occupied by the helium gas,
0.35
mole
1
⋅
22.4 L
1
mole
=
7.84 L
as
7.84 L
−
−
−
−
−
The answer makes sense because if
1 mole
occupies
22.4 L
, then
0.35 moles
(roughly a third of the moles) will occupy a third of
22.4 L
(
if we round down 22.4 L to 21 L
)
−
−
−
21
3
≈
7 L
The volume occupied by 0.34 moles of Helium Gas is 7.62 L.
What is a noble gas ?Any gas from the group of rare gases that include helium, neon, argon, krypton, xenon, and usually radon and that exhibit great stability and extremely low reaction rates. — called also inert gas.
They have properties tending to an ideal gas.
It is asked that what volume will be occupied by 0.34 moles Helium Gas
The ideal gas equation is written as
PV = nRT
At STP , T = 273 K
P= 1atm
R = 0.0821 L(atm) mol⁻¹K⁻¹
Substituting the values
1 * V = 0.34 * 0.0821 * 273
V = 7.62 L
Therefore the volume occupied by 0.34 moles of Helium Gas is 7.62 L.
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what is kwaishokor?
Answer:
Kwaishokor is a form of severe protein malnutrition characterized by edema and an enlarged liver with fattty infiltrates.
Explanation:
how much is 3.5 gallons in cups
Answer:
3.6 gallons are equal to 56 cups
Calculate the wavelength of a photon of light having a frequency of 3.50 x 1015 Hz. A. 1.05 x 1024 m B. 1.33 x 1016 m C. 8.57 x 10-8m D. 1.17 x 107 m
Answer:
1.17x107m
Explanation:
Which of the following is an example of the Law of Conservation of Mass?
Answer:
C.
Explanation:
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases, equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.
Answer:
C, since matter cannot be created or destroyed the same number of particles must be present on both sides of the equation. Hence why all chemical reactions must be balanced.
Explanation:
4. How does the water vapor change as altitude increases?
Answer:
it drifts through the atmosphere and the vapor absorbs heat then the warm air rises up therefore leaving the planet's surface and releasing the heat back into the upper part of the atmosphere
0.20dm
2. How many grams of salt, NaCl need to be dissolved in 0.50dm of solution to
make a 0.20moldm solution?
Answer:
I don't no sorry. ਕਿਉੁਂਕਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ ਸਤਿ 478figxigxurRyyv ਸ੍
Looking at the periodic table, which of theses elements has the smallest atomic radius (A. Sodium B. potasaium C. Hydrogen D. LithIum)
Answer:
The answer is C. Hydrogen
Explanation:
It has a radius of 53 pm calculated.
An irregular object with a mass of 18.00 kg displaces 2.50 L of water when placed in a large overflow container. Calculate the density of the object.
Answer:
7.20 kg/L
Explanation:
Density is mass (kg) / volume (L).
18.00kg/2.50L = 7.20 kg/L
If you need it in g/mL this is the equation:
[tex]\frac{7.20kg}{L} *\frac{1000g}{1kg} *\frac{1L}{1000mL} = 7.20g/mL[/tex]
What is the relationship between the temperature and the rate of the reaction?
negative
neutral
positive
i think it would be neutral
25 Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!
Answer:
Answers in explanation.
Explanation:
30. A (A chemical changes changes the chemical properties)
31. C (rusting is an example of a chemical change
32. B (A reaction requires energy, so some energy will be expelled)
33. B (Color change is an example of a chemical change)
34. A (The law of the conservation of mass: Mass and Energy cannot be created nor destroyed)
what is one way that the thermal energy of a system may be changed?
Answer:
In a open system, the thermal energy of a system may be changed by adding or removing matter with a different temperature.
Explanation:
The thermal energy of a system can be changed when a new substance of different temperature is introduced into the system
The thermal energy of a system is the amount of heat energy contained in that system.
The quantity of heat in a system is given as;
[tex]Q = mc \Delta \theta[/tex]
where;
[tex]\Delta \theta[/tex] is the change in the temperature of the system
When a new substance is introduced into the system, the temperature of the resulting system changes.
For example;
a hot iron introduced into a cold water, will increase the temperature of the water thereby increasing the thermal energy of the water.Thus, the thermal energy of a system can be changed when a new substance of different temperature is introduced into the system.
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which cells carry nutrients from food to the rest of the cells in the body?
Answer: The circulatory system.
Explanation: The circulatory system, which is part of the "cardiovascular" system, is one of the eleven organ systems of the human body. Its main function is to transport nutrients to cells and wastes from cells (Figure 3.4. 1). This system consists of the heart, blood, and blood vessels.
The blood cells carry nutrients from food to the rest of the cells in the body.
What is the circulatory system?The human circulatory system moves important nutrients and minerals throughout the body and metabolic waste products out from the body. The human circulatory system contains blood, blood vessels, heart, and lymph.
The human circulatory system provides essential nutrients, minerals, oxygen, and hormones to different parts of the body and is responsible for collecting toxins from the cells and tissues to be purified or eliminated from the body.
The human circulatory system contains a wide network of blood vessels. These constitute arteries, veins, and capillaries. The primary function of blood vessels is to transport nutrients and oxygenated blood to all parts of the body.
The Circulatory system helps in sustaining all the organ systems and transports blood, nutrients, oxygen, and hormones throughout the body. It secures cells from pathogens and acts as an interface for cell to cell interaction.
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i need help to pass my class
Answer:
B
Explanation:
The attraction is stronger when the magnet is closer so moving it away would decrease the strength.
Calculate the following expression and round your answer to the correct number of significant figures.
52.6cm x 1.214cm
Answer:
63.9 cm
Explanation:
what is the heat of reaction H2 + 1/3N2 2/3NH3
What is the difference between a physical and a chemical property? (please hurry)
Answer:
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. ... A chemical property describes the ability of a substance to undergo a specific chemical change.
Explanation:
Please help I’ll mark brainleist
Answer:
SAme. What's le question, I will answer correctly.
Explanation:
1pt According to Einstein's theory of gravity, the more mass an object has, the
O A. denser it will be
O B. more it will warp space
C. faster it will rotate
OD. more moons will circle it
Answer:
B. more it will warp space
Explanation:
If u have time pls help...
How is it that the chair is a solid, the water is a liquid, and the air you're breathing a solid if the entire room is the same temp? What about the substances make them different states at the same temperature?
Answer:
the internal force of attraction between the particle or molecules.
In solids the force is max.
In liquid it is intermediate.
And least in the gases..
Which pair of elements have the same number of atomic orbitals?
A.
Silver and strontium
B.
Sodium and strontium
C.
Silver and sulfur
D.
Sulfur and strontium
Answer:
B I think
Explanation:
Answer:
B, I'm guessing by their characteristics
Who wants to do my acellus work? Or know how to get the answers ?
im just answering questions to get points Explanation:
i dont know what points do
Answer:
Hello I passed my Chemistry exam (Acellus) in the beginning of June:)
Explanation:
What is the correct formula for calcium dihydrogen phosphate?
A) CaH2PO4
B) Ca(H2PO4)2
C) Ca(H2HPO4)2
D) Ca2H2PO4
Answer:
B) Ca(H2PO4)2
Explanation:
To solve this we must be knowing each and every concept related to chemical formula. Therefore, the correct option is option B among all the given options.
What is chemical formula?The chemical formula is indeed a means of expressing information about just the chemical proportion of atoms that comprise a certain chemical compound as well as molecule through the use of chemical element numbers and symbols.
Furthermore, the molecular formula does not contain any words and does not serve as a chemical name. However, it just indicates basic chemical structures and is not the same as the entire chemical structural formula. The correct formula for calcium dihydrogen phosphate is Ca(H[tex]_2[/tex]PO[tex]_4[/tex])[tex]_2[/tex].
Therefore, the correct option is option B among all the given options.
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If 5,800 j of energy are applied to a 15.2 kg piece of lead, by how much does the temp change if the specific heat of lead is 0.128
Answer:
The answer will be 2.98K
Explanation:
Using the formula:
Q = mc∆T
Q= 5,800 (heat in joules)
m= convert 15.2kg to g which is 15200g (mass in grams)
c= 0.128 J/g °c (Specific heat capacity)
∆T= what we need to find (temperature change)
5800J = 15200g x 0.128 x ∆T
= 2.98K
how many unpaired electrons does calcium have
Answer:
0
Explanation:
The number of unpaired electrons in is 0
Answer:
4 unpaired electrons
Explanation:
becausd it have 4 unpaired electros it is paramagnetic
Which of the following represents a pair of isotopes?
A. Ca+2, Be+2
B. 12C, 14C
C. Fe+2, Fe+3
D. 7N, 8O
We have that
the Carbon isotopes represents a pair of isotopes
12C, 14COption B
From the question we are told
Which of the following represents a pair of isotopes?
A. Ca+2, Be+2 B. 12C, 14C C. Fe+2, Fe+3 D. 7N, 8OGenerally
Isotopes
This is defined as variant forms of an element with variant atomic mass but same proton number
Therefore
the Carbon isotopes represents a pair of isotopes
12C, 14C
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Which one of the following is an alkane?
A. C2H4
B. C5H10
C. C3H8
D. C4H6
When measuring the volume of a liquid, why is it best to use a measuring container that is narrow?
Answer:
n the sciences, the “tools” for measuring the volumes of liquids are generally made from glass, plastic or occasionally metal, although professionals referred to all of them as “glassware.” Scientists, and chemists in particular, have a variety of glassware at their disposal for measuring volumes. The particular piece of glassware chosen in any situation will depend primarily upon two factors: the required volume and the accuracy required for the measurement.
Explanation:
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