In case you don't know what Calcium Is:
a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc., occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions.
Calcium can be found:
Calcium is a soft white chemical element found in bones and teeth
answer:
Using the definition..calcium may be used in the human body by nerve conduction, heartbeat, muscle contraction, and many other physiological functions.
·.•·°.hope this helped!!!·.•·°.
Why do ionic compounds form crystals?
Answer:
The ions have a normal, repetitive structure called an ion lattice. The lattice is formed when the ions attract each other and form a regular sequence of oppositely charged ions next to each other. ... This is why solid ion compounds form crystals with normal shapes.
How are ion crystals formed?
Ions bound together by electrostatic attraction form ion crystals. ... The plain cubic crystal lattice has ions that are evenly distributed in 3D at 90° angles. The stability of ion solids relies on the lattice energy that is emitted in the form of heat as two ions are brought together to form a solid.
Explanation:
Ion crystals are made up of ions that are electrostatically attracted to one another. Ions in the simple cubic crystal lattice are uniformly dispersed in three dimensions at 90° angles. Ion solids are dependent on the lattice energy, which is released as heat when two ions are brought together to form a solid.
What are ionic compounds?Ionic bonds, also known as electrovalent bonds, are a type of connection created in a chemical molecule by the electrostatic attraction of ions with opposing charges. One atom's valence (outermost) electrons are permanently transferred to another atom to create this type of connection.
Ions (cations) are negatively charged when an atom obtains electrons whereas ions (cations) are positively charged when an atom loses electrons (anion). The compounds created between nonmetals and the alkali and alkaline-earth metals are the greatest examples of ionic, or electrovalent, compounds, which are the outcome of ionic bonding.
The electrostatic forces of attraction between opposing charges and repulsion between comparable charges arrange the ions in these types of ionic crystalline solids so that every positive ion is surrounded by a negative ion, and the converse is true. In other words, because of the way the ions are structured, the positive and negative charges alternate and balance one another, leaving the substance overall with no charge. In ionic crystals, electrostatic forces have a considerable magnitude. These chemicals thus tend to be solid and nonvolatile.
Therefore, ion crystals are made up of electrostatically attracted ions. Ions are uniformly distributed in 3D at 90° angles in the simple cubic crystal lattice. Ion solids rely on the lattice energy that is released as heat when two ions are brought together to form a solid for their stability.
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Caffeine has the molecular formula, C8H10N4O2. What is the percent composition of caffeine?
Select one:
a) 33.33% C, 41.67% H, 16.67% N, and 8.33% O
b) 49.48% C, 5.19% H, 28.85% N, and 16.48% O
c) 25% C, 25% H, 25% N, 25% N, and 25% O
d) 27.92% C, 2.34% H, 32.56% N, and 37.19% O
Answer:
b) 49.48% C, 5.19% H, 28.85% N, and 16.48% O
Explanation:
we find the mass for each element in one mole by multiplying the number of atoms in one molecule with the atomic mass
mC=8Ac=8*12=96g
mH=10AH=10*1=10g
mN=4AN=4*14=56g
mO=2AO=2*16=32g
by adding the masses together we find the molar mass of the molecule
M=mC+nH+mN+mO=96+10+56+32=194g/mole
we apply the rule of threes to find the percentage of each element
194g..96gC..10gH...56gN....32gO
100g....a...........b...........c.............d
a=(100*96)/194=49.48%C
b=(100*10)/194=5.19%H
c=(100*56)/194=28.85%N
d=(100*32)/194=16.48%O
Which of the following statements is true?
A.
Protons are located outside the nucleus of an atom.
B.
Electrons do not have mass.
C.
Individual atoms can be seen with the naked eye.
D.
The nucleus of an atom contains protons and neutrons.
Reset
Answer:
Option D
Explanation:
The nucleus of an atom consists of both protons and neutrons
Answer:
d
Explanation:
the nucleus of an atom contains protons and neutrons.
Why can’t a smartphone disappear completely in liquid acid?
Answer:
its metal because its metal
6. India is a country connected to the continent of Asia. India used to be far apart
from Asia. Which diagram below shows what happened to the plates that India
and Asia are part of?
Which of these is an example of erosion? A light shining onto a mountain B wind blowing away sediment C rain breaking down rock D all of the above
Answer:
B wind blowing away sediment
Explanation:
Erosion is the process whereby soil, nutrients, particles are transported away from one place to another via agents like water and wind. Generally, erosion exercises its effect on the surface of the soil.
Since erosion can occur as a result of action of water or wind on the surface of the Earth, "wind blowing away sediment" is an example of erosion among the other options listed in the question.
Independent variable
Answer:
Independent variable
aluminium ball
A bag contains exactly 22 solid-colored buttons: 4 red, 6 blue, and 12 white. What is the probability of randomly selecting 1 button that is not white?
Answer:
0.45
Explanation:
We can calculate the probability of randomly selecting one button that is not white by using the formula:
Number of non-white buttons / Total Number of buttons.
We can calculate the number of non-white buttons with the information given by the problem:
# Non-White buttons = 4 + 6 = 10
Now we calculate the probability:
10 / 22 = 0.45
The probability is 0.45, or a 45% chance.
What is the difference between weight and mass?
Answer: it's easy just think about it:
Explanation:
weight: the weight of an object is the force acting on the object due to gravity.
mass: Mass is the amount of matter or substance that makes up an object.
in total: The mass of an object is a measure of the object's inertial property, or the amount of matter it contains. The weight of an object is a measure of the force exerted on the object by gravity, or the force needed to support it.
Happy to help!
Feel free to ask any questions!
answer: mass is the amount of matter in a material(m)
and weight is a measure of how the force of gravity acts upon that mass(m*g)
1. What is the term for a process causing the particles contained in
a substance to be packed more closely together?
A. coefficient of expansion
B. contraction
C.expansion
D. packing
E. squeezing
2. A one liter sample of gas is heated under constant pressure from
100°C to 200°C. Its volume increases to 1.27 liters. On further
heating to 300°C, what would the volume of the sample be?
A. 1.00 liter
B. 1.27 liters
C. 1.54 liters
D. 1.81 liters
3. A 5-liter sample of gas initially at 50°C is observed to expand to
5.5 liters when the temperature is raised to 100°C. After further
increase in temperature, the volume is 6 liters. What is the
approximate temperature (within 50 degrees) of the final state of
the gas?
A. 50°C
B. 100°C
C. 150°C
D. 200°C
Please help
Answer:
1) contraction
2) 1.54 liters
3) 150°C
4) The gas expands proportionally to the increase in temperature
5) false
6) true
7)pentane
8) it has a boiling point around 35°
Explanation:
Does dehydration cause blood to become hypotonic (lower osmolarity) or hypertonic (higher osmolarity)?
anatomy and physiology please help me w this :( need it now own words please.
Which neutral element could be represented by the Electron Dot Structure below?
Answer:
oxygen as it has 6 valence electrons
How many half-lives took place if I started with 125,000 atoms, and I now only
have 15,625 of the original atom?
what is the total number of atoms in a molecule of the compound li2so4
Answer:
Explanation:
Element Symbol Atomic Mass # of Atoms Mass Percent
Lithium Li 6.941 2 12.626%
Oxygen O 15.9994 4 58.209%
Sulfur S 32.065 1 29.165%
What is the number 6.02x10^23 also known as?
Answer:
Avogadro's number or Avogadro's constant.
A student uses a microscope to observe a single-celled organism that can move. The organism contains a nucleus and many chloroplasts. Based on the observations, the student claims the organism is not a bacterium. Which observations BEST supports the student's claim. * 1 point The organism is unicellular. The organism is able to move. The organism has a nucleus. The organism performs photosynthesis.
Answer:
The organism has a nucleus
Explanation:
According to this question, a student makes a claim that an observed organism is not a Bacteria. Organisms have been classified into two major domains based on their nucleus. Eukaryotic organisms have a well-defined double membrane nucleus while prokaryotes do not.
The organism being observed in this question posseses a nucleus and many chloroplasts meaning that the organism is most likely an EUKARYOTE. The observations that backs the student claim is that the organism has a nucleus. Bacteria is an example of prokaryotic organisms with no nucleus in their cell.
100 points will to help
Answer:
6. 350kg
7. 800kg
8.600 meters
Explanation: I don’t like Stealing point but this is what I think I should give you and I don’t know how your teacher learn you this...
Answer:
6 is 350kg
7 is 800kg
8 is 600 meters
Explanation:
Thanks btw
When the bromine atom becomes an anion, it ______ in size.
Group of answer choices
A. increase
B. decrease
C. remains the same
When the strontium atom becomes a cation, it ______ in size.
A. increase
B. decrease
C. remains the same
Explanation:
Anions and cations have different atomic sizes than the neutral atoms.
When the bromine atom becomes an anion, it ______ in size.
Anions involves gaining extra electrons. This basically leads to increased repulsion between the electrons and thereby increasing the size. Anions are always larger than the neutral atoms.
This means the answer is A. Increase
When the strontium atom becomes a cation, it ______ in size.
Cations involves losing valence electrons. This basically leads to a decrease in electron shells and electron repulsion thereby reducing the size. Cations are always larger than the neutral atoms.
This means the answer is B. Decrease
what is the amount of gold present in 15.5g of a pure gold ring? (Au=197)
Answer:
.0787 moles
Explanation:
I'm assuming you mean moles of gold present as the "amount."
This is a moles to moles calculation, so we set it up as such:
*Note that 15.5g Au is given to us, and 197 g / mol of Au is gold's molar mass.
15.5g Au * (1 mol Au / 197 g Au) = ?
We can evaluate the equation to get 15.5 / 197 to get .0787 moles of Au.
How many Valence electrons and energy shells does Ge have?
A.4 Valence Electrons and 6 Energy shells
B.7 Valence Electrons and 3 Energy shells
C.2 Valence Electrons and 6 Energy shells
D.4 Valence Electrons and 4 Energy shells
Answer:
D. 4 Valence Electrons and 4 Energy shells
Explanation:
Hello!
In this case, since finding the number of valence electrons and energy shells require the determination of the electron configuration for the element, knowing that germanium has 32 electrons (atomic number), we have:
[tex]1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^2[/tex]
We can see that the outermost energy shell is 4 which storages 4 electrons (2 from 4s and 2 from 4p); therefore, we infer it has 4 valence electrons and 5 energy shells, so the answer is:
D. 4 Valence Electrons and 4 Energy shells.
Best regards!
what is the atomic number of carbon
ph is a scale that ____ the audacity or basicity of a solution along the range of zero to 14
At 27.8 °C, a gas occupies 1500 mL. What volume will it have at 100.0 °C?
Answer:
V₂ = 1866.32 mL
Explanation:
Given data:
Initial temperature = 27.8°C (27 + 273.15 K = 300.15 k)
Initial volume = 1500 mL
Final volume = ?
Final temperature = 100.0°C (100.0 + 273.15 K = 373.15 K)
Solution:
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
1500 mL / 300.15 k = V₂ / 373.15 K
V₂ = 1500 mL× 373.15 K/ 300.15 k
V₂ = 560175 mL. K /300.15 k
V₂ = 1866.32 mL
Which parts of the atom move around the nucleus? (Plz help)
Answer: Electrons
Explanation: The electrons are found outside the nucleus and orbit it.
What is the point of an object where the force of gravity is considered to act?
Answer:
Center of gravity
Explanation:
Gravity always acts downward on every object on earth . Gravity multiplied by the objects mass produces a force called weight. Although the force of an objects weight acts downwards on every partial of the object , it is usually considered to act as a single force through its balance point , or center of gravity.
Which is the greater mass?0.007960 grams or 0.7960 mg?
Answer: milligrams
Explanation:
Because 0.007960 = 1.75487961e-5 pounds
And 0.7960= 1.75488e-6
HELP!!!!!! I will give you 15 points for this , please don’t guess
Answer:
Heterozygous refers to having inherited different forms of a particular gene from each parent.
Explanation:
An open "empty" 2 L plastic pop container, which has an actual inside volume of 2.05 L, is removed from a refrigerator at 5 °C and allowed to warm up to 21 °C. What volume of air measured at 21 °C, will leave the container as it warms?
2.168 L of air will leave the container as it warms
Further explanationGiven
V₁=2.05 L
T₁ = 5 + 273 = 278 K
T₂ = 21 + 273 = 294 K
Required
Volume of air
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Input the value :
V₂=(V₁.T₂)/T₁
V₂=(2.05 x 294)/278
V₂=2.168 L
Plz I need help with my chemistry homework jJnsjs
answer
1.1 Carbon is the sixth element in the periodic table.
(IV A)
1.2 electric configuration: O⁸ (He²) 2s² 2p⁴ .
atomic number: 8
1.3 protons= 8 , electron = 7
1.4 oxygen has 6 valence electrons .
carbon has 4 valence electrons.
1.5 the answer is in the photo.
A gas has a volume of 13.4 L at 17C. What is the volume of the gas at standard temperature?
Answer:
This law states that the volume and temperature of a gas have a direct relationship: As temperature increases, volume increases, when pressure is held constant. Heating a gas increases the kinetic energy of the particles, causing the gas to expand.
Explanation:
Considering the Charles's law and STP conditions, the volume of the gas at standard temperature is 12.61 L.
Charles's lawCharles's law establishes the relationship between the volume and temperature of a gas sample at constant pressure.
This law says that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. That is, the volume is directly proportional to the temperature of the gas.
Mathematically, Charles's law states that the ratio between volume and temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Considering an initial state 1 and a final state 2, it is fulfilled:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
Definition of STP conditionThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C (or 273 K) are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Volume of the gas at standard temperatureIn this case, you know:
V1= 13.4 LT1= 17 C= 290 K (being 0 C= 273 K)V2= ?T2= 0 C= 273 K (at STP)Replacing in the definition of Charles's law:
[tex]\frac{13.4 L}{290 K} =\frac{V2}{273 K}[/tex]
Solving:
[tex]V2= 273 K\frac{13.4 L}{290 K}[/tex]
V2= 12.61 L
Finally, the volume of the gas at standard temperature is 12.61 L.
Learn more about
Charles's law:
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STP conditions:
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