Answer: you need to know the Mass (grams) of the object, and its Volume (measured in mL or cm³). Divide the mass by the volume in order to get an object's Density. How can you tell if something will float in water?
Explanation:
Answer:
To find the density of an object you need to know the Mass (grams) of the object and its Volume. Divide the Mass by the Volume in order to get the object's density.
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lodine is 80% 1271, 17% 1261, and 3% 1281. Calculate the average atomic mass of
iodine.
Isotopes are members of an element family that have the same number of protons but differ in the number of neutrons.
Atomic mass of Iodine = 126.86 amu
What is a isotope ?Isotopes are members of an element family that have the same number of protons but differ in the number of neutrons.isotopes are a type of atom, the smallest unit of matter that retains all of an element's chemical properties. Isotopes are chemical elements that have unique properties.Isotopes can form either spontaneously (naturally) through radioactive decay of a nucleus (emission of energy in the form of alpha particles, beta particles, neutrons, and photons) or artificially (via accelerators or neutrons in a nuclear reactor) by bombarding a stable nucleus with charged particles via accelerators or neutrons.The elements in nature have several types of isotopes
Atomic mass is the average atomic mass of all its isotopes
MassAtomic mass of Iodine = 126.86 amu atom X = mass isotope 1 . % + mass isotope 2.% + ... mass isotope n.%
Atomic mass of Iodine = 0.8 x 127 + 0.17 x 126 + 0.03 x 128
Atomic mass of Iodine = 101.6 + 21.42 + 3.84
Atomic mass of Iodine = 126.86 amu
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Is steel a compound or a mixture?
In a___ one line represents one pair of electrons being shared.
Choices:
A. Structural formula diagram
B. Dot diagram
C. Space-filling model
D. Ball-and-stick model
Write the symbol for every chemical element that has atomic number greater than 11 and atomic mass less than 24.8
Answer: You would write elements in period 1, 2, 3, and period 4 but you would stop at chromium
Explanation: It would have been too long for me to write every symbol
Directions: Find the scale for and volume shown in each graduated cylinder. You should estimate the final place.
Inaccuracies of 11% are acceptable.
A. Scale of this G.C.-33
-40
40
A. Scale of this G.C.
B. Explain your answer to A
B. Volume Shown
C. Volume Shown 33
-301
A. Scale of this G.C.
-30
A. Scale of this G.C.
B. Volume Shown
B. Volume Shown
-12
C. What do you think is the
maximum volume of this GC and
why?
-8
-11
strate the
1. When the velocity of an object changes, it is acted upon by a(n)
deceleration.
inertia.
momentum.
force.
Answer:
when the velocity of an object changes,it is acted upon by an external force
When the velocity of an object changes, it is acted upon by a force. Therefore, option D is correct.
What causes a change in velocity explain ?Forces have an impact on how objects move. They can cause motion; they can also slow, stop, or change the direction of motion of an already moving object.
We can say that forces cause changes in velocity because they cause changes in an object's speed or direction. Keep in mind that acceleration is defined as a change in velocity.
Because velocity is a vector quantity, the given statement is correct. It is affected by both magnitude and direction. When one or both of them change, the velocity changes as well.
Thus, When the velocity of an object changes, it is acted upon by a force, option D is correct.
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With which group would group 18 most likely bond
Answer:
The noble gases (Group 18) are located in the right of the periodic table and were previously referred to as the "inert gases" due to the fact that their filled valence shells (octets) make them extremely nonreactivE
Explanation:
What is the pneumonic of the metric line
Answer:
Explanation:
Mnemonic Device: Kings Hate Dragons Because Dragons Can't Make Money. Explanation: to remember the Metric prefixes, or the decimal ladder, and base unit (Kilo, Hecto, Deca, Base, Deci, Centi, Milli, Micro).
The outside temperature is
35°C. What is the temperature in
K
Answer:
308.15
Explanation:
308.15K − 273.15 = 35°C
Which of the following produces a chemical change?
O A. Boiling water
B. Burning candle wax
O C. Cooling molten lava
O D. Grinding iron into powder
Option B= Burning candle wax
Answer:buning candle wax B
Explanation:
A P E X
What happens to mass in an isolated system?
A) mass cannot enter or exit an isolated system
B) mass can exit but not enter an isolated system
C) mass can enter and exit an isolated system
D) mass can enter but not exit an isolated system
Answer:
A) mass cannot enter or exit an isolated system
Explanation:
An Isolated system is both insulated and sealed. No matter or energy can neither escape into the surroundings nor enter from the surroundings
Answer: A. mass cannot enter and exit an isolated system
Explanation: just took the quiz
length is a fundamental quantity. give reason.
Answer:
Explanation:
There is a fundamental length, the Planck length. It is the length that light (a photon) travels in a unit of time called the Planck time and conforms to the way to measure length in general, as given by the equation
L = ct
Where L is length (or distance), c the speed of light (3 X 10^8 meters/sec), and t the time the light travels in. The Planck length is exceedingly small (magnitude 10^-35 meters because the Planck time is short (10^-44 sec)
The Planck length, or any length based on the speed of light, is not subject to the imprecision we would find by measurement with a physical ruler, for example, because a ruler can expand or shrink or be bent or warped, etc.
Rather, length based on c (in a vacuum) is constant. This concept is another gift from Einstein’s theory of special relativity. It’s also the central concept in spacetime, though it would take some explaining for me to say why it is so.
How much hear must be obsorberd by 375.0 grams of water to raise its temperature from 10.0c to 35.0c? The specific heat capacity of water is 4.186 J/gC.
HELP DUE TOMORROW!!! ASAP
Answer:
The heat absorbed by water is 39243.75 J.
Explanation:
Given data:
Mass of water = 375.0 g
Heat absorbed by water= ?
Initial temperature = 10.0°C
Final temperature = 35.0 °C
The specific heat capacity of water = 4.186 j/g.°C
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
ΔT = 35°C - 10°C
ΔT = 25°C
Q = m.c. ΔT
Q = 375.0 g× 4.186 j/g °C × 25°C
Q = 39243.75 J
The heat absorbed by water is 39243.75 J.
Hydrogen gas caught fire quickly in the Hindenberg accident. In comparison, neon gas and helium gas are nonreactive. This is why helium is safe for aircraft and neon is safe for electrical signs. Which statement best explains why helium and neon have similar chemical properties?
Answer:
Helium and Neon have similar chemical properties because both of them completely fill the outer shell of their atoms' electrons, so there is nothing to share with other atoms, neither with the same element nor with any other element.
Explanation:
Helium and Neon are both noble gases . As elements react, their atoms, by losing, acquiring, or sharing electrons, complete their outer shells. Noble gas atoms already have full outer shells, so there is no tendency for them to lose, gain, or share electrons. There are incomplete outer shells of atoms of group 1 and 7 elements (so they are reactive)
Chemical properties of HELIUM and NEON -:
In group 8(or 0) of the periodic table, on the far right side, the Noble Gases are contained. Helium, neon, argon, krypton, xenon and radon are their names. They are extremely colourless and unreactive. They do not form bonds, so they still remain as single (monatomic) atoms. There is very little chemical reactivity in them.Hence, helium and neon have similar chemical properties as they are the most stable due to having the maximum number of valence electrons their outer shell can hold.
Chromium has a smaller atomic radius than iron. *
O
True
False
Answer:
False
Explanation:
Atomic radius is defined as the distance between the nuclei of 2 identical atoms that are bonded together
Now, from periodic tables, chromium has a calculated atomic radius of 1.66 Å while iron has a calculated atomic radius of 1.56 Å
Thus, chromium has a bigger atomic radius than iron.
So the statement is false.
Which of the following is NOT how compounds are formed?
Group of answer choices
Atoms give away electrons to other atoms
Atoms accept electrons from other atoms
Atoms share electrons with other atoms
What would happen if you mixed baking soda and milk?
Answer:
it'll produce carbondioxide bubbles
Answer:
it would prevent the milk from curdling
Explanation:
baking soda is regularly added to milk, believe it or not
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
Which symbol represents an ion?
4He
Ca
Mg
Na2+
40 points Plz Help me
Safety in the lab has to be a priority at all times when doing an investigation. Describe how you demonstrated good safety practices by using goggles during the lab. Why was it important for you to wear goggles during the lab?
Answer:
so the chemical doesn't get in ur eyes
Explanation:
Bob rides his motorcycle with a constant speed of 116 km/h. How far can he travel in 1 hour?
Answer:
116 km...
Explanation:
as mentioned in the question, speed is constant....as it is clearly given the speed is 116 km per hour....so it will go 116km in an hour.
what property of material does salt possess
Answer:
Salt crystals are translucent and cubic in shape; they normally appear white but impurities may give them a blue or purple tinge. The molar mass of salt is 58.443 g/mol, its melting point is 801 °C (1,474 °F) and its boiling point 1,465 °C (2,669 °F).
What is a cinder cone volcano composed of after it erupts to form a volcano?
Answer:
They are built from particles and blobs of congealed lava ejected from a single vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone.
Explanation:
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__ P4(s) + __ O2(g) → __ P4O10(s) To balance this reaction equation, first write correct formulas for the reactants and products, leaving the stoichiometric coefficients blank. We will balance P first. How many P4 molecules are needed to balance P for each P4O10?
Answer:
P4(s) + 5 O2 (g)→ P4O10
Explanation:
If we desire to write a balanced chemical reaction equation, the rule of thumb is simple; the number of atoms of each element on the right hand side of the reaction equation must be the same as the number of atoms of the same element on the left hand side of the reaction equation. Once this condition is satisfied, the reaction equation is said to be balanced.
As we can see, we need one mole of P4 and five moles of O2 to produce one mole of P4O10.
The balanced reaction for the combustion of phosphorus (P₄) to form phosphorus pentoxide (P₄O₁₀),
P₄(s) + 5O₂(g) → P₄O₁₀(s)
So, 1 P₄ molecule is needed to balance the number of phosphorus atoms for each P₄O₁₀ molecule.
A balanced equation is a chemical equation in which the number of atoms of each element on the reactant side is equal to the number of atoms of the same element on the product side. In other words, the law of conservation of mass is satisfied, meaning that no atoms are created or destroyed during the chemical reaction.
The coefficients (numbers in front of the chemical formulas) in a balanced equation represent the relative proportions of each reactant and product involved in the reaction. This ensures that the total mass of the reactants is equal to the total mass of the products in a chemical reaction.
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4Al(s) + 3O₂(g) --> 2Al₂O₃, how many atoms are there? *
10 points
Answer:
12 atoms
but u said there are 10 pts but only 5 are there
Answer:
[tex]6.02 \times {10}^{24} \: atoms[/tex]
Step-by-step explanation:
Number of atoms of Al = Number of moles of Al × Avogadro constant
[tex] = 4 \times 6.02 \times 10 ^{23} [/tex]
[tex] = 2.408 \times 10 ^{24} \: atoms[/tex]
Number of atoms of O = Number of moles of O × Avogadro constant
[tex] = 6 \times 6.02 \times {10}^{23} [/tex]
[tex] = 3.612 \times 10 ^{24} \: atoms[/tex]
Total number of atoms
[tex] = 2.408 \times {10}^{24 } + 3.612 \times {10}^{24} [/tex]
[tex] = 6.02 \times {10}^{24} atoms[/tex]
Which sample of matter is a single substance
A air
B ammonia gas
C hydrochloric acid
D Salt water
Answer:
B) Ammonia gas
Explanation:
Ammonia gas: It consists of only one molecule namely ammonia throughout the substance so it is a pure single substance.
In a complete reaction, 23 grams of sodium reacts with 37 grams of chloride , what is the total mass of sodium chloride produced (made)?
Answer:
60 grams NaCl
Explanation:
Because it is a complete reaction, the total mass of all the reactants is used. According to the law of conservation of mass, the same amount product should be produced as there was reactants. Add the mass together.
23+37= 60 g
Which number indicates the energy level of an atom's valence electrons?
O A. The period number
O B. The group number
O c. The atomic number
O D. The mass number
Answer:A, The Period Number
Explanation:
just took the test
Select the correct answer.
Which formula describes Newton's second law of motion?
OA force = mass x acceleration
rn abs
OB. force =
acceleration
Ос, force = mass x velocity
OD force =
velocity
mass
The correct answer describes Newton's second law of motion : A. Force = mass x acceleration (F=m.a)
Further explanationNewton's 2nd law states that :
the acceleration from the applied force is proportional to the resultant force and inversely proportional to the mass
Can be formulated
[tex]\tt a=\dfrac{F}{m}[/tex]
or
[tex]\tt F=m\times a[/tex]
F = force, N
m = mass, kg
a = acceleration, m/s²
Please helpppp ASAP !!!!Which phase changes require the addition of energy to happen, which phase changes require the removal of energy ?
Answer:
Evaporation
Explanation:
Evaporation involves a liquid becoming a gas and sublimation is the change of a solid directly to a gas. Phase changes require either the addition of heat energy or subtraction of heat energy .
I need to write the definition with an example what it means.the word is opaque
Answer: opaque means not able to see through. An example is that a window is not opaque because you can see through it, but a rock is opaque.
Answer:
Opaque Definition below:
Explanation:
not able to be seen through; not transparent.
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