Answer: a) -1
Explanation:
How many atoms of aluminum are in a molecule of magnesium aluminum oxide (Al2MgO4)?
Answer:
12
Explanation:
A sample of gas has a volume of 10 ml at 2 atm. The pressure increases to 4 atm. What is the new volume?
Answer:
The answer is 5 mLExplanation:
In order to find the new volume we use the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
We have
[tex]V_2 = \frac{10 \times 2}{4} = \frac{20}{4} \\ [/tex]
We have the final answer as
5 mLHope this helps you
What is the oxidation number of Gallium?
Answer: +3
Explanation: Gallium liquefies just above room temperature. Gallium is a soft solid, however it quickly becomes liquid when heated.
Earth Layers: describe each layer of makeup, location, and physical properties.be sure to include which layers are compositional and watch are mechanical
Answer:
Ok so the earth layers are
Crust, the surface of the earth
Mantle, where the lava usually comes from or how volcanos form due to the tectonic plates moving
outer core
inner core is the hottest
if you are asking for the compositional and mechanical layers that would be
Crust, mantle, core, Lithosphere, Asthenoshpere, Mesosphere, out core, and inner core
Mechanical: Lithosphere, Asthenosphere, mesosphere, outer and inner core
Compostional: Crust, Mantle, and core
When copper is bombarded with high-energy electrons, X rays are emitted. Calculate the energy (in joules) associated with the photons if the wavelength of the X rays is 0.154 nm.
Answer:
E = 12.92 × 10^(-16) J
Explanation:
Formula for energy is;
E = hc/λ
Where;
h is Planck's constant = 6.63 x 10^(-34) J.s
c is speed of light = 3 × 10^(8) m/s
λ is wavelength = 0.154 nm = 0.154 × 10^(-9) m
E = (6.63 x 10^(-34) × 3 × 10^(8))/(0.154 × 10^(-9))
E = 12.92 × 10^(-16) J
The energy associated with the photons of X rays with a wavelength of 0.154 nm is 1.29 × 10⁻¹⁵ J.
When copper is bombarded with high-energy electrons, X rays, with a wavelength of 0.154 nm (λ) are emitted.
We can calculate the energy (E) associated with the photons of these X rays using the Planck-Einstein relation.
[tex]E = \frac{h \times c }{\lambda } = \frac{(6.63 \times 10^{-34}J.s ) \times (3.00 \times 10^{8}m/s ) }{0.154 \times 10^{-9} m } ]= 1.29 \times 10^{-15} J[/tex]
where,
h: Planck's constantc: speed of lightThe energy associated with the photons of X rays with a wavelength of 0.154 nm is 1.29 × 10⁻¹⁵ J.
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What is a stable electron configuration?
the product of 173.06 times 0.21 should be reported as what using proper number of sig figs?
Answer:
36.3
Explanation:
The full answer would be 36.3426, but because of the 0.21, you round it down to 3 sig figs.
For lunch you have a glass of sweetened ice tea. The glass contains crushed tea leaves, sugar, a slice of lemon, and both liquid and frozen water (ice cubes). Which of the following categories of matter best describes the contents of the glass? *
Answer:
I think solids
Explanation:
sorry if its not right
Matter is anything that takes up space and can be described by physical and chemical properties. Which statement
BEST differentiates chemical properties from physical properties?
A)
Physical properties are properties that can be physically seen or touched,
while chemical properties can only be found when matter is mixed with
specific chemicals.
B)
Physical properties are measured when matter changes its physical state,
while chemical properties can only be measured if matter remains in one
state for an extended time.
C)
Physical properties are difficult to measure because they require special
tools to detect, and chemical properties are easy to measure and require
not special tools to detect.
D)
Physical properties can be measured/observed without changing matter
into something else, while chemical properties describe matter's ability to
react/combine with other matter.
Answer:
D)
Physical properties can be measured/observed without changing matter
into something else, while chemical properties describe matter's ability to
react/combine with other matter.
Explanation:
Physical Change
The changes that occur only due to change in shape or physical properties but their chemical or internal composition remain unchanged.
1 = These changes were reversible.
2= They have same chemical property.
3= These changes can be observed with naked eye.
Example :
Water converting to Ice
Water converting to gas
In this water molecule remain the same only they rearrange themselves that change its state of mater not composition
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
1 = These changes are irreversible
2 = These changes occur due to chemical reactions
3 = These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO₂ and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg .
The reaction of Hydrogen and oxygen:
H₂ (g) + O₂ (g) → 2H₂O (l)
How many atoms are in a sample of 2.89 moles of potassium (K)?
Answer:
The answer is
1.74 × 10²⁴ potassium atomsExplanation:
To find the number of atoms given the number of moles we use the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
n = 2.89 moles
We have
N = 6.02 × 10²³ × 2.89
We have the final answer as
1.74 × 10²⁴ potassium atomsHope this helps you
Burning 1 kg of coal releases about 3 million joules of energy. If you could use all of the chemical energy to lift another kilogram of coal, how high could you lift it?
I could lift 3.06 x 10⁵ m high
Further explanationEnergy is the ability to do work. Energy can change from one energy to another
Potential energy is the energy that an object has because of its position
The potential energy can be formulated:
Ep = m. g. h
E = potential energy of an object, joule
m = object mass, kg
g = gravity acceleration, m / s²
h = height of an object, m
energy of coal = 3.10⁶ J
mass = 1 kg
g = 9.8 m/s²
[tex]\tt h=\dfrac{E}{m.g}\\\\h=\dfrac{3.10^6}{1\times 9.8}=3.06\times 10^5`m[/tex]
How many cesium atoms are in 21.9 grams?
The chemical formula for glucose, a type of sugar, is C 6H 12O 6. Which statement is true about glucose?
Answer:
The answer is C, Glucose is a compound, because it is made of more than one element.
Explanation:
Complete Question is ;
The chemical formula for glucose, a type of sugar, is C₆H₁₂0₆. Which statement is true about glucose?
1) Glucose is a compound because it's made from more than 1 element
2) Glucose is an element because it's made up from more than one kind of atom.
3) Glucose is an element because it can be separated.
4) glucose is a compound because is made of protons, neutrons and electrons
Solution ;
The statement which is true about glucose is (1) Glucose is a compound because it's made from more than 1 element. Hence the correct option is (1)
What is an Element ?Aan element made entirely of one species of atoms, or an atom which has a specific number of protons in its nucleus.
Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
Three substances make up glucose: carbon, hydrogen, and oxygen. They are set at a fixed ratio of 1:2:1.
Covalent bonds, in which two atoms share bonding valence electrons in one or more bonds, are used to bind these atoms together.
Therefore, The statement which is true about glucose is (1) Glucose is a compound because it's made from more than 1 element. Hence the correct option is (1)
learn more about Compound here ;
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PLZ HELP ME!!!!!!!!!!!!!!!
Answer:Graduated Cylinder
Explanation:
You use the water displacement test to find the volume of irregular shaped objects.
Answer:
Graduated Cylinder
1Which statement about plant cells is true? A A plant cell cannot contain both a nucleus and chlorophyll. Incorrect answer B A plant cell can contain both chlorophyll and a nucleus. Incorrect answer C A plant cell must contain chlorophyll, but can have no nucleus. Incorrect answer D A plant cell has neither a nucleus nor chlorophyll.
Answer:
B A plant cell can contain both chlorophyll and a nucleus.
Explanation:
All plants are eukaryotic organisms i.e the cells of all plants possess a membrane-bound nucleus that houses their genetic material (DNA). In addition to this, most plant cells also contain a unique organelle called CHLOROPLAST, which they use to capture the energy from sunlight in order to perform a process called PHOTOSYNTHESIS.
According to this question, plant cells can contain both chlorophyll and a nucleus. They can possess chlorophyll because chlorophyll is a pigment in their chloroplast that captures the light energy.
What causes the change within every twenty four hours from day to night on Earth?
A)
Earth's rotation on its axis
the tilt of Earth on its axis
Tarth's revolution around the sun
the distance from Larth to the Sun
Tamashenomena on the top of the sun that appear as dark spots compar
Please answer
Answer:
Earth's rotation.
Explanation:
Most of the options are obviously incorrect, with the exception of tilt. However, tilt is the cause of seasons, not days.
Answer: Earth's rotation on its axis
Explanation:
In an ionic bond
a. electrons are shared equally
b. protons are transferred
c. electrons are shared unequally
d. electrons are transferred
Answer: a chemical bond; in which one atom donates an electron to another atom
Explanation:
1. A teacher instructs her students to measure out 50.0 mL of hydrogen
peroxide for three trials of an experiment. A student measures out 37.2 mL,
38.7 mL, and 36.9 mL.
Use this information to answer the questions below (1a and 1b).
3 points
1a. Calculate the percent error for each measurement and include them
below. (For example: 1%, 2%, 3%) *
Answer:
by measuring the teacher gets to 1590
Explanation:
ndnmv drf
A woman is found dead on a boat floating in the middle of a lake at 4:30am. There is blunt force trauma to her head but no other discernable damage. She is approximately 30 pounds overweight. She is wearing thermal clothing and a winter jacket, gloves, and hat. Climatological data indicate it was a clear, cold, and windy night with no precipitation. Calculate the time of death based only on a body temperature of 15.6°C (60.8°F)? Now consider the other factors presented. How would each affect this estimation?
Answer:
Dead bodies lose one degree Celsius per hour, which we could deduce that the person died 12 hours ago.
Explanation:
On the other hand, it is very important to take into account that this number of hours is very approximate, since not only does it vary greatly with the environment and the acclimatization of the environment in which the person dies, but also in this specific case, insulating clothing was presented , which made the loss of body heat much more difficult and could easily be more than 12 hours.
The minimum for this particular situation is 12 hours to 24 hours possible postmortem.
In Bohr’s model of the atom, where are the electrons and protons located?
3. describe how unequal heating causes weather
Answer:
The uneven heating causes temperature differences, which in turn cause air currents (wind) to develop, which then move heat from where there is more heat (higher temperatures) to where there is less heat (lower temperatures).
Explanation:
Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground. What is the independent variable?
Answer:
Wing length
Explanation:
According to the given excerpt, independent variable is 'wing length' and dependent variable is 'amount of time it takes for helicopter to hit the floor'.
Independent variable refers to the variable that do not undergo any change or shift in the course of the experiment of research. The other variables are measured using the constant independent variable. The value obtained from the independent variable is independent. On the other and, the dependent variable witnesses change with respect to the independent variable.
Are hemoglobin formation and functioning brains and muscles benefits of Iron?
1.why does gravity exist?
2.what does the strength of gravity on?
3.what will have stronger force of gravity, jupiter or earth ?
This class is science !!
Answer:
Gravity exists because elementary particles (electrons, quarks, and neutrinos), are NOT static with time and expansion. Matter is dynamic; elementary particles must continually accrete energy (the quanta of space) in order to conserve the continually increasing angular momentum of the expanding universe.
Strength of gravity
9.80665 m/s 2
Jupiter
A + ion (positive ion, one with extra positive charge)?
Answer:
If an ion has a positive charge then it has lost an electrons.
Explanation:
So you don't "gain" anything when the ion has a positive charge. It loses an electron which means it has more protons than electrons. Thus, the ion has a positive charge. If it "gained" an electron then it would have a negative charge.
HELP QUICK What is the mass of an object that has a volume of 2 ml and a density of 10g/ml?
Answer:
The answer is 20 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 10 × 2
We have the final answer as
20 gHope this helps you
What is the main difference between gases and liquids
Answer:
1.Liquids have less force of attraction between molecules than solids and more than gases; gases have a very weak force of attraction between the molecules which is the least amongst the three states of matter. 2.Liquids have definite volume; gases do not have definite volume.
Explanation:
:) HOPE THIS HELPS
Answer:
particles
Explanation:
particles are buzzing around very quickly when in a gas, but when in a liquid they vibrate.
What is a graph?
A graph is a _______________________ representation of the relationship between two quantities.
_______________________ variable (manipulated)
Controlled by experimenter
_______________________________ variable (responding)
Something we observe as the result of the experiment
*Visual
*Independent
*Dependent
I NEED HELP!!! How is continental crust different from oceanic crust?
Oceanic crust is thinner and more likely to sink.
Oceanic crust is thicker and more dense.
Continental crust is more dense and lighter.
Continental crust is thicker and more likely to sink.
Answer:
A
Explanation:
Oceanic crust is thinner and more likely to sink
Answer:
The answer is A Oceanic crust is thinner and more likely to sink.
Explanation:
I hope this is right sorry if it's not.
Which technology is shown in the photograph?
A. Negative controls
B. Biostimulation reaction
C. Gel electrophoresis
D. Polymerase chain reaction
Answer:
C
Explanation:
Apex