Answer:
Dana filtered the sample and larger granules of the sample were left behind.
Explanation:
If a substance is pure, it will have a uniform composition throughout. It will not separate into particles of various sizes.
One of the characteristics of pure substances is that they are homogeneous. A mixture is definitely made up of particles of various sizes.
Since the particles was filtered and larger granules were left behind, the sample has been separated by a physical method (filtration). Only a mixture can be separated by physical methods. It is not a pure substance.
I will make you brainiest! In this analogy, which part of the lunar cycle is waning - from the new moon to the full moon or the full moon to the new moon?
Answer:
Explanation:
After the glorious appearance of Full Moon, the lunar shape starts to wane, meaning it gets smaller. It's visible later at night and into the early morning, and we see a steadily shrinking shape of the lunar surface that's being lit up.
How is a "decay event' recorded
Which best describes the current model of the atom?
O A a central nucleus containing protons with electrons orbiting in specific paths
O B. a solid sphere unique for everything that exists
O c a solid sphere with electrons and protons embedded
O D. a central nucleus containing protons and neutrons with electrons orbiting in levels of high probability
Explanation:
i think the answer might be D
The Tissues of vascular Plants are organized into more complex structures that carry out a Variety of functions in the plant what structure is formed by a Group of tissues that work together to carry out a Specific function
A) Cell
B) Organ system
C)Organism
D Organ
Answer:
D Organ
Explanation:
A group of tissues that work together to carry out a specific function is known as organ.
Life is organized into distinct levels. These organization makes it possible for certain cells which are the basic unit of life to carry out their respective function.
A group of cell that performs the same function are organized into tissues. A group of tissues that work together to carryout a specific function are known as organs. A group of organs that perform the same functions forms the organ systems.
As the complexity of an organism increases, so also is their organization of life.
How do you calculate wavelength and frequency?
Answer:
Wavelength can be calculated using the following formula: wavelength = wave velocity/frequency. Wavelength usually is expressed in units of meters. The symbol for wavelength is the Greek lambda λ, so λ = v/f.
Explanation:
Just a formula that's commonly used in biology.
Use the equation below to solve the problem that follows.
2H2 (g) + O2 (g) → 2H2O (g)
When David reacts 13.8 grams of hydrogen gas with excess oxygen, 87.0 grams of water are formed. Calculate his percent yield of water.
Percent yield = 70%
Further eplanationPercent yield is the comparison of the amount of product obtained from a reaction with the amount you calculated
General formula:
Percent yield = (Actual yield / theoretical yield )x 100%
An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients
Reaction
2H₂ (g) + O₂ (g) → 2H₂O (g)
mass of H₂O (theoretical) :[tex]\tt mass=mol\times MW(mol~ratio~H_2O\div H_2=2\div 2)\\\\mass=(\dfrac{2}{2}\times \dfrac{13.8}{2})\times 18~g/mol\\\\mass=124.2~g[/tex]
percent yield[tex]\tt \%yield=\dfrac{87}{124.2}\times 100\%=\boxed{\bold{70\%}}[/tex]
8. Which type of element requires the least amount of energy to remove an electron?
Answer:
nonmetals
Explanation:
At a constant temperature, 2L of a gas at 4atm of pressure is expanded to 6L. What is the new pressure? Please show steps!!
Answer:
The answer is 1.33 atmExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{2 \times 4}{6} = \frac{8}{6} = \frac{4}{3} \\ = 1.333333...[/tex]
We have the final answer as
1.33 atmHope this helps you
Boron- 11
Atomic #
Atomic mass
# of protons
# of neutrons
# of electrons
Answer: 5 protons 6 neutrons and 5 electrons. and atomic number is 5.
Hope this helps!
Please help me with my Chemistry homework!! I have so much homework to do for other classes and I’m so stressed so even answering one question would be amazing!!!
1. A graduated cylinder had an initial volume of water of 22 mL. After an iron nail is dropped into the cylinder, the water rises to 38 mL. What is the volume of the nail?
2. Ms.Chavez dropped a gold ring into a graduated cylinder filled with water. The water level was originally at 20 mL. Now the water is at 25mL. Ms.Chavez knows that means the volume of the ring is 5 mL. What else would she have to do to find the density of her ring? Explain.
3. A simple of liquid propanol has a volume of 20.0 cm*^3 and a mass of 15.0 g. What is the density of propanol? Write only your answer below.
An object has a mass of 67.4 ounces and a volume of 13.8 cups. What is the density? _______ oz/cup (your answer should *only* be a number, round to one decimal place if needed) *
Answer:
4.9
Explanation:
Given data:
Mass of object = 67.4 ounce
Volume = 13.8 cup
Density = ?
Solution:
d = m/v
d = 67.4 ounce/13.8 cup
d = 4.9 oz/cup
Thus, density of object is 4.9 oz/cup.
what are cons of viruses ?????? oh dont mind this i jus gotta get this out of my head dont stop pop tht pop tht mhm jus like tht mhm shake it shake it mhm work it work it!!!!!!!!!!!
Answer:
Viruses can weaken your immune system. They make you sick. Some could even cause death.
Explanation:
I hope this helped I heard that song I forgot the name lol
The speed in which the moon orbits the earth is 500 mph.
a. True
b. False
Answer: False
Explanation: The moon travels at 1.42 mph around the Earth.
Answer:
false
Explanation:
Rain freezes as it hits the ground to form solid water is this a physical change or chemical change?
a. Physical change
b. Chemical change
Can someone help me answer this I will give your brainliest
Answer:
It is Physical Change
Explanation:
Because it is just water turning into another substance of water, nothing chemical is happening.
A piece of silver is heated and added to a styrofoam cup calorimeter containing 26.0 mL (the density of water is 1 g/mL) of water at 19 oC. The water reaches a maximum temperature of 44 oC after the metal was added. If the specific heat of the silver is 0.240 J/g oC and it started at 93.8 oC
Answer:
m(Ag) = 227.5g
Explanation:
...what is the mass of the piece of silver?
The heat given for the piece of silver is the same heat that is absorbed for the water, that is:
m(Ag)×C(Ag)×ΔT(Ag) = m(Water)×C(Water)×ΔT(Water)
m is mass of water in solution: 26.0mL = 26g of water
And m(Ag) is the mass of Ag, our incognite.
C is specific heat (0.240J/g°C for Ag), and 4.184J/g°C for water
ΔT is change in temperature (93.8°C - 44°C = 49.8°C) for Ag ad (44°C - 19°C = 25°C)
Replacing:
m(Ag)×C(Ag)×ΔT(Ag) = m(Water)×C(Water)×ΔT(Water)
m(Ag)×0.240J/g°C×49.8°C = 26g×4.184J/g°C×25°C
m(Ag)* 11.952J/g = 2719.6J
m(Ag) = 227.5g
Which container has gas stored at the highest temperature
Answer: 3
Explanation:
Answer:
kinetic energy
Explanation:
may be iam not sure
different type of flatbread
Please help this is chemistry.
Answer:
C
Explanation:
the rest are trends except for Electronegativity
how to determine whether a liquid is pure water or not besides boiling the liquid?
Answer:
Explanation:
Aside the boiling point of water, another colligative property that can be used to identify pure water (or not) is the freezing point. Water freezes at 0 °C, but with the presence of impurities, there is a freezing point depression of the water. Thus, if the water is not pure, the liquid could freeze at a temperature lower than 0 °C (with a negative sign like -8 °C).
______ have trees with cones.
A. temperate rainforests
B. boreal forests
C. tropical rainforests
D. temperate deciduous forests
Answer:
D.
Explanation:
Which part of project management involves determining possible risks?
Answer:
Resources
Explanation:
Answer:
Explanation:
M
What is the mass of 1.794 mol Ba(NO3)2?
Explanation:
Molar mass of Ba(NO3)2 = 261.3368 g/mol
the atomic number tells us all of the following except ..
Answer:
b
Explanation:
The atomic number tells us all of the following except B. The order in which the elements were discovered.
What does the atomic number let you know?
The atomic number is the number of protons in the nucleus of an atom. The number of protons outline the identity of detail (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
What pieces of facts do the atomic number inform you?The atomic variety helps human beings discover factors in step with the variety of protons one atom of the element has. It essentially defines the element. while having a neutral rate, it also offers the variety of electrons the detail has (in one atom). while isotopes are a component, it would not completely exchange the atom.
Learn more about Atom at https://brainly.com/question/6258301
#SPJ2
:answer question number 5
Answer:
it is simple true and thanks for point
Answer:
True
Explanation:
TRUST:)
please someone help me its due today thanks :D
Answer:
D
Explanation:
All of the above are great examples!
"Endothermic reactions are those which absorb heat during the reaction."
With a force of 5 newtons, Amanda pushes the stack of books to the right. At the same time, Jeremy, her little brother, pushes the stack of books to the left with a force of 10 newtons.
Answer:
A. 5 N to the left
Note: The question is incomplete. The complete question is given below:
With a force of 5 newtons, Amanda pushes the stack of books to the right. At the same time, Jeremy, her little brother, pushes the stack of books to the left with a force of 10 newtons.
What is the direction and magnitude of the resulting force?
A. 5 N to the left
B. 5 N to the right
C. 10 N to the right
D. 10 N to the left
Explanation:
Forces are vector quantities.
Vector quantities are quantities that can be represented both in magnitude and direction.
Forces have both magnitude and direction. Forces can be directed positively or negatively.
For example, in the question above, if forces acting to the right are considered to be in the positive direction, forces acting to the left are considered to be acting in a negative direction.
In the addition of forces, both their magnitude and direction are taken into consideration.
In the example above, taking forces acting to the right as positive and to the left as negative, the sum of the forces is:
Resultant force, F = (5 N) + (-10N)
F = -5 N
Therefore, the net force is 5 N and is directed towards the left
Answer:
5 N to the left
Atoms and ions are all the same.
Answer:
Yes they are
Explanation:
The number of atoms of an element in a chemical formula is given by the _________.
Answer:
Explanation: In a chemical formula, the symbols for each element in the compound are followed by subscripts that tell us how many of that element are in the compound. The subscripts that follow each element's symbol indicate how many of that element are in the compound. Notice how H is located in more than one place.
Explanation:
2. Atoms of 160, 170, and 180 have the same number of
Have the same number of protons but a different number of neutrons
Further explanationThe elements in nature have several types of isotopes
Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.
So Isotopes are elements that have the same Atomic Number (Proton)
SO the Three Common Isotopes Of Oxygen :
₈¹⁶O, ₈¹⁷O, and ₈¹⁸O have :
1. The same number of protons = atomic number = 8
2. Have a different number of neutrons :(neutrons= mass number-atomic number)
₈¹⁶O : neutron = 16-8=8
₈¹⁷O : neutron = 17-8=9
₈¹⁸O : neutron = 18-8=10
(?)Li2O + (?)H2O → (?)LiOH
what goes inside the question marks?
Answer:
(1)Li2O + (1)H2O → (2)LiOH
Hope this helps!