Answer:
There are 2 answers. A and C
Explanation:
Si is Silicon, which is a metalloid,
Br2 is Bromine, which is a metalloid
When a substance is added to water, bubbles form. How can you confirm the type of change that took place?
How many moles are there in 2.3 x 10^23 formula units of NaCl?
Answer:
0.38 mol
Explanation:
Given data:
Number of formula units = 2.3×10²³
Number of moles = ?
Solution:
According to Avogadro number ,
1 mole contain 6.022×10²³ formula units.
2.3×10²³ formula units × 1 mol / 6.022×10²³ formula units
0.38 mol
Thus, 2.3×10²³ formula units of NaCl contain 0.38 moles of NaCl.
How many atoms of aluminum are in 4.9 mol of aluminum?
Answer:
8.14 mols al
Explanation:
12. Draw the lewis structure for the element to help you answer the question *
Answer:hope it helps
Explanation:
the average diameter of an adult human eyeball is 24mm what is the diameter in dm
Answer: 0.24 dm
Explanation:
Calculate the empirical formula of each of the following substances with the following compositions.
a 3.60 g of magnesium and 10.65 g of chlorine
b 9.1 g of lithium and 10.4 g of oxygen
Explanation:
Note: Molar masses of elements can be found online or in the periodic table.
Moles of Magnesium
= 3.60g / (24.3g/mol) = 0.148mol.
Moles of Chlorine
= 10.65g / (35.45g/mol) = 0.300mol.
Mole ratio of Magnesium to Chlorine
= 0.148mol : 0.300mol = 1 : 2.
Hence we have the empirical formula MgCl2.
Moles of Lithium
= 9.1g / (6.94g/mol) = 1.311mol.
Moles of Oxygen
= 10.4g / (16g/mol) = 0.650mol.
Moles ratio of Lithium to Oxygen
= 1.311mol : 0.650mol = 2 : 1.
Hence we have the empirical formula Li2O.
Which of the following statements best describes how metamorphic rock was formed?
A. Low temperature and low pressure may transform an igneous rock into a metamorphic rock with banded layers.
B. High temperature and intense pressure may transform an igneous rock into a metamorphic rock with banded layers.
C. Low temperature intense pressure may transform a sedimentary rock into a metamorphic rock with banded layers.
Answer:
High temperature and intense pressure may transform an igneous rock into a metamorphic rock with banded layers.
Explanation:
A metamorphic rock is formed under high temperature and intense pressure may transform an igneous rock into a metamorphic rock with banded layers.
An igneous rock is often formed when molten magma erupts from the earth's crust. The molten magma is usually very hot but cools off with time to form a solid mass.
This rock that was first formed eventually gets transformed in the course of time as it is acted upon by high temperature and intense pressure which gradually transforms the igneous rock into a metamorphic rock with banded layers.
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During the process of condensation, water vapor does what
Answer: the water molecules become more organized and heat is released into the atmosphere as a result.
Explanation:
C3H8 (g) 5O2 (g) -> 3CO2 (g) 4H2O (l) in the reaction represented baove, what is the total number of moles of reactants consumed when 1.00 mole of CO2 (g) is produced
Answer:
The total number of moles of reactants consumed when 1.00 mole of CO₂ (g) is produced is 2 moles.
Explanation:
You have that the balanced reaction is:
C₃H₈ (g) + 5 O₂ (g) ⇒ 3 CO₂ (g) + 4 H₂O (l)
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactants and products participate in the reaction:
C₃H₈: 1 moleO₂: 5 molesCO₂: 3 molesH₂O: 4 molesThe rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:
a ⇒ b
c ⇒ x
So [tex]x=\frac{c*b}{a}[/tex]
where a, b and c are known values. In this case the rule of three is applied as follows: if by stoichiometry of the reaction 3 moles of CO₂ consume 1 mole of C₃H₈, then 1 mole of CO₂ how many moles of C₃H₈ will it consume?
[tex]moles of C_{3} H_{8} =\frac{1 mole of CO_{2} *1 mole of C_{3} H_{8} }{ 3moles of CO_{2}}[/tex]
moles of C₃H₈= 0.33
Applying again a new rule of three: if by stoichiometry of the reaction 3 moles of CO₂ consume 5 moles of O₂, then 1 mole of CO₂ how many moles of O₂ will it consume?
[tex]moles of O_{2} =\frac{1 mole of CO_{2} *5 moles of O_{2} }{ 3moles of CO_{2}}[/tex]
moles of O₂=1.67
The total number of moles of reactants consumed will be the sum of the consumed moles of C₃H₈ and the consumed moles of O₂:
0.33 moles + 1.67 moles=2 moles
The total number of moles of reactants consumed when 1.00 mole of CO₂ (g) is produced is 2 moles.
a microscope is a labolatory tool that is used to__________ this allowed scientists to ____________ we cannot see using our naked eyes such as _____ protists ______and___________ the main parts of a microscope that magnifies are the __________ and the ___________. the__________ serves as the light source. in order to see he specimen clearly the stage needs to be adjusted at the right distance from the lens. this is done using the __________ and _______. other parts of the microscope such as the______. ______ and _________ serves as a primary support for device
Answer:
See the answer below
Explanation:
A microscope is a laboratory tool that is used to magnify the image of objects This allowed scientists to study tiny organisms that cannot be seen with an ordinary eye. We cannot see some organisms using our naked eyes, such as bacteria, protists, viruses, and microscopic fungi. The main parts of a microscope that magnifies are the ocular and the objective lenses. the lamp serves as the light source. In order to see the specimen clearly the stage needs to be adjusted at the right distance from the lens. this is done using the coarse and the fine adjustment knobs. other parts of the microscope such as the base and the arm serve as primary support for the device.
The microscope is primarily designed to magnify the image of objects and, thus, enables one to see objects that cannot ordinarily be seen with the naked eyes. It magnifies objects using a system of lenses in the ocular and the eyepiece. Microscopic organisms such as protists, bacteria, viruses, microscopic fungi and algae can be seen using the microscope. Slides of objects are prepared and placed on the stage of the microscope and the coarse/fine adjustment knobs used to adjust the stage in order to bring the image on the slide into focus through the ocular. A lamp at the base provides the light source for the light microscope while other parts such as the arm, the head, and the base provide supportive functions for the microscope,
The description, features and function of a microscope can be found explained below.
MICROSCOPE:
A microscope is a laboratory tool that is used to magnify images. This allows scientists to study tiny organisms that cannot be seen with the naked eye. We cannot see some organisms using our naked eyes, such as bacteria, protists, viruses, and microscopic fungi. The main parts of a microscope that magnifies are the eye and objective lenses. The lamp serves as the light source. To see the specimen clearly the stage needs to be adjusted at the right distance from the lens and this is done using the coarse and the fine adjustment knobs. Other parts of the microscope such as the base and the arm serve as primary support for the device.Learn more at: https://brainly.com/question/18661784?referrer=searchResults
A block of material has a volume of 2 mº. It has a mass of 1 x 104 kg. Calculate the density of the materia
sample and express your results in g/cm with appropriate scientific notation.
Answer:
d = 0.5×10¹g/cm³
Explanation:
Given data:
Volume of material = 2 m³
Mass of material = 1×10⁴ Kg
Density of material = ?
Density:
Density is equal to the mass of substance divided by its volume.
Formula
d = m/v
Solution:
Volume of material = 2 m³
1 m³ = 1000000 cm³
2 ×10⁶cm³
Mass of material = 1×10⁴ Kg
1 Kg = 1000 g
1×10⁷ g
by putting values into density formula
d = 1×10⁷ g/2 ×10⁶cm³
d = 0.5×10⁷⁻⁶ g/cm³
d = 0.5×10¹g/cm³
As of January 2009, the USA has produced 60,000 metric tons of nuclear waste in 60 yesrs of operating 104 nuclear power plants.
on average how much waste is produced by each plant on a monthly basis?
a. 0.8 tons p. month
b. 83.3 tons p. month
c. 104 tons p. month
d. 866.3 tons p. month
Answer: a. 0.8 tons p. month.
Explanation:
Given: Total nuclear waste = 60,000 metric tons
Time take = 60 years = 12 x 60 months [ 1 year = 12 months]
= 720 months
Total nuclear power plants = 104
Now , Average waste produced by each plant = [tex]\dfrac{\text{Total waste}}{\text{Time x Number of plants}}[/tex]
[tex]=\dfrac{60000}{720\times104}\approx0.8\text{ tons per month.}[/tex]
Hence, 0.8 tons p. month is produced by each plant.
So, option a. is correct.
Answer:
A on edge 2021
Explanation:
A box of groceries requires 5,0 newtons of force to lift it up 1.0 meter. How much work is done?
0.0 J
1.0 J
2.0 J
5.0 J
Please help I’ll give Brainliest
What is the name for the elements that have some properties of metals and some properties of non-metals
Answer: The metalloids are a unique group of elements that share properties of both metals and nonmetals.
Explanation: They're also called the semimetals because of the shared properties of these elements along the dividing line between metals and nonmetals.
Describe a macroscopic properties of a solid
what is it called when when animals release water vapor into the atmosphere
Answer:it’s so they could breathe
Explanation:the water cycle
name five organs of the digestive system and state there function
Answer:
Organ Movement Food Particles Broken Down
Stomach Upper muscle in stomach relaxes to let food enter, and lower muscle mixes food with digestive juice Proteins
Small intestine Peristalsis Starches, proteins, and carbohydrates
Pancreas None Carbohydrates, fats, and proteins
Liver None Fats
Explanation:
A vehicle travels 60. km north and then 40. km south. What is its total displacements?
Answer:
20 km north that's the answer hope it helped
Which of these landforms woul most likely be found at a divergent boundary?
A. fault line
B. mid-ocean ridge
C. volcanic island
D. mountain
Answer:
A.
Explanation:
Divergent boundaries occur when plates move away from each other, causing rifts.
The landform created by the divergent boundary is the oceanic plates. Thus option B mid-ocean ridge is correct.
What are plate boundaries?Plate boundaries are created by the movement of tectonic plates.When two tectonic plates diverge from each other , a diverging border is created.
As magma or molten rock rises from the Earth's mantle to the surface and solidifies to form new oceanic crust, earthquakes frequently occur along these borders. Divergent plate boundaries can be seen, for instance, in the Mid-Atlantic Ridge.
An area where two plates converge is referred to as a convergent border. The borders of one or both colliding plates may bow up into mountain ranges as a result of the impact, or one plate may bend downward into a deep undersea trench.
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HEY! Nicki Minaj is the queen of rap.
Answer:
O my OMG
Explanation:
Remember Nicki vs. Cardi
Temperature Changes (Iron)
Measure the initial temperature of the water to the
nearest 0.1°C. Record in the data table.
Initial temperature of metal =
PC
Initial temperature of water =
"С
Final temperature of both =
27
DONE
26
25
24
23
2
250 ml
Continue
Intro
12 of 15
The temperaturechanges for iron and water is calculated using the formula: Temperature change = Final temperature - Initial temperature.
Measurements of temperatureTemperature measures the degree of hotness or coldness of a body.
In measuring temperature, a thermometer is the instrument used.
To determine temperature changes, the initial and final temperature of the substance is recorded.
The temperature change is calculated using the formula below:
Temperature change = Final temperature - Initial temperature.In the case of an iron at higher temperature dipped in water at lower temperature, the initial and final temperature of both the water and Iron is recorded.
The formula given above is used to calculate the temperature change.
Therefore, temperature change is calculated using the formula: Temperature change = Final temperature - Initial temperature.
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Which nuclear equation represents a spontaneous decay?
(1) Rn 21% Po + He
(2) 13 Al + He 18P + on
(3) 235 U + in ~ 13% Ba + Kr + 3n
(4) Li + H → He + He
a. 1
b. 2
C 3
d. 4
Answer:
a. 1
Explanation:
Radon is a member of group 18. It is an odorless heavy gas, that emanates from materials that contain uranium.
Rn is a decay product of 226-Ra, a member of the uranium decay series. The spontaneous decay of Rn decay leads to the emission of an alpha particle.
Rn has a half-life of about 3.8 days and its decay product is 218Po.
The nuclear reaction which shows a spontaneous decay is Rn 21% Po + He.
What is spontaneous reaction?
Those reaction in which value of their enthalpy change and change in Gibb's free energy is negative, are spontaneous in nature.
Among all of the given reaction, only first reaction is spontaneous in nature because the given element Radon (Rn) is the product of the decay of uranium series. And in this reaction energy is emitted in the form of alpha particles.
Hence, option (1) is correct.
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Need help on this please help
Answer:
It's because the Earth is tilted on it's axis. So the second answer.
I hope that helps :)
Based on the image below, what would an observer on the nighttime side of Earth observe? A total lunar eclipse A partial lunar eclipse A partial solar eclipse A Full Moon
Answer:
A Full Moon
Explanation:
If it is the same image I had it would be a full moon since there are no shadows on the moon. This means the moon gets full sunlight
how many electrons does tellurium need to obtain the octet rule
Answer:
8
Explanation:
This number normally equals the number of electrons that atom needs to have a total of eight electrons (an octet) in its outer shell.
What causes valley air to move up surrounding mountains during the day?
The Sun warms the air in the valley more than it does the mountains.
The Coriolis Force moves the winds up the sides of hills and mountains.
The Sun warms the tops of hills and mountains more than it does the valley.
The valley air is denser because is of its lower elevation.
Answer:
so the third one
Explanation:
During the day, the sun heats up mountain air rapidly while the valley remains relatively cooler. Convection causes it to rise, causing a valley breeze. At night, the process is reversed. During the night the slopes get cooled and the dense air descends into the valley as the mountain wind.
Answer:
The Sun warms the tops of hills and mountains more than it does the valley.
Explanation:
which of the following is a possible consequence of a mare laboring for a lengthy time after amniotic sac has broken
Answer:
c. the mother could get an infection
Explanation:
Which of the following is the correct equation for the reaction below?
One molecule of propane gas reacts with five molecules of oxygen gas to form three molecules of carbon dioxide gas and four molecules of water vapor.
A. CzHg (g) + 502 (9) ► 3C02 (9) + 4H20 (9)
B. C3Hg (s) + 502 (s) — 3CO2 (s) + 4H20 (3)
C. CH (9) + 502 (9) — 3C02 (9) + 4HO (9) D. CzHg (9) + 50 (g) → 3C0 (g) + 4H20 (9)
need asap
Answer:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Explanation:
One molecule of propane gas reacts with five molecules of oxygen gas to form three molecules of carbon dioxide gas and four molecules of water vapor.
To every chemical equation, there are products and reactants:
Reactants → Products
Here:
Reactants:
1 mole of propane = C₃H₈
5 mole of oxygen gas = 5O₂
Products;
3 mole of CO₂ = 3CO₂
4 moles of water vapor = 4H₂O
The reaction equation is therefore;
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Answer:
C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g)
Explanation:
This is the actual answer
Which one of the following does not involve a change of state? *
Freezing
Melting
Expansion
Boiling
Answer:
melting is the answer any questions I'm glad to help
When solid converts to gas then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. Therefore, the correct option is option C.
What is phase transition?Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.
During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing. Among all the given option, expansion is the only process in which change of state does not take place.
Therefore, the correct option is option C.
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Isotopes of the same element have a different number of ______
Answer:
atomic weight..................
