Answer:
Radiation and conduction
Explanation:
The human body lose heat by these two ways, because everything that touches our bodies and is in a temperature below us will receive part of our heat (conduction), and you can figure out that we lose heat by radiation because a human bright in a heat cam
In which process do particles move closer together but remain in motion?
А condensation
B
diffusion
с
evaporation
D
freezing
Answer: c
Explanation: the particles stay together but has some gain more heat they break apart.
Choose the statement that is TRUE. Question 26 options: Outer electrons efficiently shield one another from nuclear charge. All of the answers are true Valence electrons are most difficult of all electrons to remove. Core electrons effectively shield outer electrons from nuclear charge. Core electrons are the easiest of all electrons to remove.
The statement which is true is Core electrons effectively shield outer
electrons from nuclear charge.
Core electrons are those which are in close proximity with the nucleus. The
core electrons repel the outer electrons farther away from the nucleus to
shield it from nuclear charge.
The valence electrons are usually found in the outermost part of the shell
and they are the easiest to remove due to the fact that they have to achieve
a stable octet configuration which makes them easily removed during
chemical reactions.
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Answer: core electrons effectively shield outer electrons from nuclear charge
Explanation:
determine the element of lowest atomic number that contains a complete d subshell in the ground state.
Answer:
The element with the lowest atomic number that contains a complete d-subshell in the ground state is copper.Source:
Determine the element of lowest atomic number that contains a complete d subshell in the ground... - Study.comHow much heat is absorbed when 25 g of water increases by 45 K?
4709.25 joules of heat are absorbed when 25 grams of water increases temperature by 45 K.
Let suppose that temperature change experienced by water is entirely sensible. Then, we can estimated the heat absorbed by the water sample ([tex]Q[/tex]), in joules, through this expression:
[tex]Q = m\cdot c \cdot \Delta T[/tex] (1)
Where:
[tex]m[/tex] - Mass of the water sample, in grams.[tex]c[/tex] - Specific heat of water, in joules per kilogram-Kelvin.[tex]\Delta T[/tex] - Temperature change, in Kelvin.If we know that [tex]m = 25\,g[/tex], [tex]c = 4.186\,\frac{J}{g\cdot K}[/tex] and [tex]\Delta T = 45\,K[/tex], then the heat absorbed by the water sample is:
[tex]Q = (25\,g)\cdot \left(4.186\,\frac{J}{g\cdot K} \right)\cdot (45\,K)[/tex]
[tex]Q = 4709.25\,J[/tex]
4709.25 joules of heat are absorbed when 25 grams of water increases temperature by 45 K.
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under which conditions do you expect helium gas to deviate most from ideal behavior?
Answer:
Explanation:
[2-0] NC Special Operation
[2] Supervisor
[2-1] Emergency Response
[2-2] Juggernaut
[2-3] Commander
[2-4] Division Director
I'm melting point of a substance is the blank which it melts
Answer:
hope its help
Explanation:
melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at a standard pressure such as 1
Answer:
I hope you have your correct answer
which value represents the first ionization energy of a nonmetal
Answer:
increase in going from left to right across a given period.
Explanation:
Nonmetals, which are found in the right-hand region of the periodic table, have relatively large ionization energies and therefore tend to gain electrons. Ionization energies generally increase in going from left to right across a given period.
hope it is helpful:)
The volume of a gas must be measured at several points during an experiment. Which units should be used to describe the volume of the gas?
liters
centimeters
degrees Celsius
milligrams
Answer:liters
Explanation:
Vanadium crystallizes in a body-centered cubic lattice, and the length of the edge of a unit cell is 305 pm. What is the density of V
Answer:
5.96 g/cm^3
Explanation:
Corner atom = 1/8
Atoms in center = 1
Atoms in face of the cube= 1/2
Molar mass of V = 50.94 g/mol (from period table)
1 mole = 6.02x10^23
In BCC unit cell:
(8 x 1/8)+ 1=2 per 1 unit cell
Mass: 2(50.94g)/6.02x10^23 = 1.69x10^-22 g/unit cell
305pm=(305x10^-12m÷10^-2m) x (1mL÷1cm^3)
= 2.837 x 10^-23 mL
1pm=10^-12m
1cm=10^-2m
1mL=1cm^3
density=mass/volume
density of V = 1.69x10^-22g÷2.837x10^-23mL
=5.957g/mL
=5.96g/cm^3
why do alkaline Solutions feel slippery when damp Between Two Fingers
Answer:
because they are saturated
The unbalanced equation below shows the reaction between sodium and water. In the reaction,
hydrogen gas is given off and sodium hydroxide is formed. The gas is collected and there is found to be
1.8 grams of hydrogen. What mass of sodium would have been used in this reaction?
Na + H2O + NaOH + H2
Answer:
41.4 g
Explanation:
2Na(s) + 2H2O (l) ----> 2NaOH ( aq) + H2 (g)
According to the above balnced chemical equation the ratio between moles of H2 gas formed to moles of Na used up is 1:2
Molar mass ( Mass of 1 mol) Of H2 gas is 2 gmol-1
So in 1.8 g of H2 0.9 mol should be present
Therefore no. of moles of Na used should be 2× 0.9 = 1.8 moles
Molar mass of Na= 23 gmol-1
So mass of 1.8 mol of Na = 1.8× 23 g = 41.4g
Question 2
20 pts
What types of elements make up salt and what type of compound is it?
nonmetals only and covalent
metals only and ionic
metals and nonmetals and ionic
what type of intermolecular force causes the dissolution of nacl in water?
Answer:
ion-dipole forces
Explanation:
positive sodium ion will be attracted to the slightly negative oxygen atoms in the water molecule, while the negative chloride ion is attracted to the slightly positive hydrogen atoms.
TRUE or FALSE the term “anti-inflammatory” likely means “against inflammation”
Answer:
True
ANTI MEANS AGAINST
Explanation:
which type of spectra would be produced by a hydrogen lamp?
Answer: Emission spectra
The Emission spectrum can be separated into three types:
Line emission spectrum Continuous emission spectra.Band emission spectrumWhat is a Hydrogen lamp?
A gas of hydrogen atoms will create an absorption line spectrum if it is between you (telescope+spectrograph) and a continuum light source, and also an emission line spectrum if considered from a distinguishable angle.
When The emission spectrum of atomic hydrogen has been divided into several spectral sequences, with wavelengths given by the Rydberg formula.
These experimental spectral lines are due to the electron-making transitions between two energy positions in an atom.
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Which of these describes “Al”?
atomic mass
chemical symbol
atomic number
none of the above
what describes “Al” is chemical Symbols.
It is not atomic mass because atomic mass is the quantity of matter contained in an atom of an element.
It is not atomic number because it's the number of proton in an atom of an
element.
The above description "Al" is a chemical symbols.
Chemical symbols are used to represents elements in the periodic table.
The element represented is aluminium.
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Question ( please help me )
1 . Which diagram shows pure substance that are elements
2. Which diagram shows pure substance are compounds
3. Which diagram shows a mixture of compounds
4. Which diagram shows a mixture of elements
5. Which diagram shows a mixture of an element and a compound
Answer:
1. F, H, E
2. A, D, I
3. G
4. E, B, H
5. C
Explanation:
PLZ HELP
What are 3 genetic disorders caused by either missing or extra chromosomes? Provide a brief short explanation of what causes the disorder and some potential symptoms.
Answer:
Single-gene disorders, where a mutation affects one gene. Sickle cell anemia is an example.
Chromosomal disorders, where chromosomes (or parts of chromosomes) are missing or changed.
Complex disorders, where there are mutations in two or more genius.
Hope it help^^
Brainliest me pls
Most elements are ____________. The _____________ elements on the left of the stair-step line on the ______________ of Elements are metals or metal-like _____________. Some of the physical properties of metals are ______________ (shininess) and ___________ density. They are also good conductors of ___________ and ______________. Metals can be hammered into __________sheets.
Answer:
metals, 88 , periodic table , luster , heat, electricity , thin, right, opposite , appearance , luster , malleable , ductile, opposite , shiny, moderately
Explanation:
metals, 88 , periodic table , luster , heat, electricity , thin, right, opposite , appearance , luster , malleable , ductile, opposite , shiny, moderately Is the answer.
(Hope this helps can I pls have brainlist (crown)☺️)
Apply: Many gyms and health clubs have steam saunas, which are small steam-filled rooms. Traditionally, steam saunas have a container of heated rocks. A small ladle of water is poured on the rocks in order to make the steam.
1. Use what you have learned so far about heat transfer to explain how hot rocks can be used to make steam?
2. Why do you think only a small ladle-full of water is poured on the rocks at one time?
Answer:
the heat vaporization of water is very high with small amounts of water you can vaporize the water as it hits the rocks into steam. (i think)
Explanation:
How do plants slow down erosion?
They slow down water as it runs downhill.
They speed up water as it runs downhill.
Their roots crack open rocks.
Their roots create new rock.
Answer:
I'm thinking the answer is gonna be it slows it down as it runs down hill
PLEASE HELP ME ASAAAAPPPPPPPPPPPPPP!!!!!!!!!!!!!!!!!!!!!!!
Balance the chemical equation using the algebraic method.
C4H10+O2=CO2+H2O
SHOW YOUR WORK PLEASEEEEEEEEE
How to determine intermolecular forces.
Answer:
Incase you have H and F and another H and F
_ is the process in which an element spontaneously transforms into another isotope of the same element, or into a different element.
Answer:
Nuclear transmutation
Explanation:
The process in which an element spontaneously transforms into another isotope of the same element, or into a different element is called nuclear transumutation. It occurs when the number of protons or neutrons in the nucleus of an atom is changed.
How does the current flow affect pressure.
Answer:
when less water is flowing
In a few minutes, you will work with your partner to create three dances—one for each of the three phases. Each dance will represent the molecular freedom of movement of that particular phase.
If needed, navigate back to My Work to refer to your homework from Lesson 1.4. Then, begin brainstorming ideas for movements that would show these phases.
Dance ideas for solids:
Dance ideas for liquids:
Dance ideas for gases:
What do all atoms in a period (horizontal rows) have in common?
Answer:
the same number of atomic orbitals.
Explanation:
Answer:
All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.
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What is the role of cellular respiration in organisms?
to provide energy for photosynthesis
to provide energy for breaking apart fuel molecules
to provide energy for making oxygen
to provide energy for cell activity
Answer:
C. sorry if I'm wrong ...................
what is the mass of the product of 111.6g and 48g
Answer:
159.6
Explanation:
Due to the law of conservation of mass, mass is neither created nor destroyed in a chemical reaction. Hence, the mass of the product is the equivalent of the mass of the sum of the reactants.
Describe how the suspects used the chemicals found at the crime scene to make the copper coins look silver.
The chemicals found at the crime scene although not mentioned must be Sodium zincate.
Discussion:
An interesting demonstration to show plating and alloys is the conversion of copper coins to silver look-alike coins.
A 'copper' coin when dipped into a solution of sodium zincate in contact with zinc. The coin is plated with zinc and appears silver in colour.
This is a common chemistry classroom trick.
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