Answer:
Negatively charged ion.
Explanation:
Example:
Oxygen is an element containing negatively charged ions. Its valence number is minus 2.
Hope this helps ;) ❤❤❤
what is sublimation
Answer:
Sublimation is the transfer or transition of a substance from the solid state to the gaseous state without passing through the liquid state .
(In simple terms ; Sublimation occurs when a substance changes from solid to gas without becoming a liquid)
Examples ;
Dry ice solid CO2CamphorExplanation:
Answer:
Sublimation is the transition of a substance directly from the solid to the gas phase without passing throught the intermedate liquid phase.
Explanation:
One gallon is equal to 16 cups. One cup is equal to 8 ounces. Assume you have 10.24 ounces of milk. Convert this value to gallons. show work
Answer:
There 0.08 gallon in 10.24 ounces of milk.
Explanation:
It is given that,
1 gallon = 16 cups ....(1)
1 cup = 8 ounces ....(2)
We need to convert 10.24 ounces of milk to gallons.
From equation (2)
1 ounce = 1/8 cup
10.24 ounce = [tex]\dfrac{1}{8}\times 10.24=1.28\ \text{cup}[/tex]
From equation (1),
1 cup = 1/16 gallon
1.28 cup = [tex]\dfrac{1}{16}\times 1.28=0.08\ \text{gallon}[/tex]
So, there 0.08 gallon in 10.24 ounces of milk.
Are spirit filled thermometers safer than mercury filled ones?
Answer:
Yes they are safer.
Explanation:
As far as I know Spirit filled thermometers contain alcohol which is much less toxic than mercury. Mercury is a heavy metal and is therefore fairly toxic similarly to lead.
I hope this helps let me know if anything is unclear.
Your question has been heard loud and clear.
Yes , spirit filled thermometers are safer than mercury ones , actually they are made to be safer than the mercury.
In a spirit filled thermometer , it is precise and also there really is no risk of the stuff (usually alcohol or organic liquid) exploding if the thermometer glass breaks unlike the mercury thermometer , where if the glass breaks , there is a high risk of the mercury ball intoxicating the air and endangering lives.
Thank you
Convert 88.2°C into °F
what does it mean to be in the path of totality science
Answer:
The track of the Moon's shadow across Earth's surface is called the Path of Totality. This path is typically 16,000 kilometers (about 10,000 miles) long but only 160 kilometers (100 miles) or so wide. In order to see the Sun totally eclipsed by the Moon you must be in the path of totality.
Explanation:
what is the density of an object having a mass of 4.0 g and a volume of 30 mL?
Answer:
8.324 Hope this helps! =)
Anyone know the answer to this? Explain if you do, im not sure if i understand what its asking.
Answer:
1. Proton = 4
2. Neutron = 5
3. Electron = 2
Explanation:
9 4Be^2+
From the above, we obtained the following:
Atomic number = 4
Mass number = 9
Charge = +2
1. Determination of the proton.
Atomic number is simply defined as the proton number. This implies that:
Atomic number = proton number
Atomic number = 4
Therefore,
4 = proton number
Proton = 4
2. Determination of the Neutron.
Mass number = Proton + Neutron
Mass number = 9
Proton = 4
Neutron =?
Mass number = Proton + Neutron
9 = 4 + Neutron
Collect like terms
Neutron = 9 – 4
Neutron = 5
3. Determination of the electron.
From the question given
9 4Be^2+
The atom has a charge of +2. This implies that the atom has lose 2 electrons. Thus we can obtain the electron as follow:
Proton = 4
Charge = +2
Electron =?
Electron = Proton – charge
Electron = 4 – 2
Electron = 2
Water flows over Niagara Falls at the average rate of 2,400,000 kg/s, and the average height of the falls is about 50 m. Knowing that the graviatational potential energy of falling water per second = mass (kg) x height (m) x gravity (9.8 m/s2), what is the power of Niagara Falls? How many 15 W LED light bulbs could it power?
Answer:
1) The power of Niagara Falls is 1.176 × 10⁹ W
2) The number of 15 W LED light bulbs it could power is 78.4 × 10⁶ light bulbs
Explanation:
1) The Niagara falls water mass flow rate = 2,400,000 kg/s
The height of the fall = 50 meters
The gravitational potential energy = Mass (kg) × height (m) × gravity (9.8 m/s²)
The power = The energy converted per second = Mass flow rate (kg/s) × height (m) × gravity (9.8 m/s²)
Therefore;
The power of Niagara Falls= 2,400,000 kg/s × 50 m ×9.8 m/s²= 1.176 × 10⁹ W
The power of Niagara Falls = 1.176 × 10⁹ W
2) The number, n, of 15 W LED light bulbs it could power is given by the relation;
n × 15 W = 1.176 × 10⁹ W
∴ n = 1.176 × 10⁹ W/(15 W) = 78.4 × 10⁶ light bulbs
The number of 15 W LED light bulbs it could power = 78.4 × 10⁶ light bulbs.
is calcium a metal, nonmetal, or metalloid?
Answer:
Calcium is a metal.
Explanation:
It is considered a metal because it is most likely to give away it's two valence electrons to reach Argon. All the elements in gray are metals.
Which one of the following would you expect to dissolve in water? limonene sucrose oil atmospheric oxygen none of the above
-----------sucrose----------------
Water is a polar molecule that has the ability to dissolve the polar molecules. Sucrose being a polar molecule will be able to get dissolved. Thus, option b is correct.
What are polar molecules?
Polarity is a characteristic shown by the polar molecules that shows covalent bonds and have electronegativity differences between the positive and the negative charges.
It has been said that a substance has a tendency to attract a similar substance and hence polar molecule of water attracts the sucrose molecule and easily dissolves it.
On the other side, limonene, oil, and atmospheric oxygen are non-polar molecules and hence are incapable of getting dissolved in another polar molecule.
Therefore, option b. sucrose gets dissolved in water.
Learn more about polarity, here:
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In nature, where do fusion reactions take place?
Answer:
it takes place only at extremely night temperatures
Explanation:
I looked it up
Answer:
In nature, fusion reactions take place in the Sun and other stars.
Explanation:
Edmentum sample answer!!
Which of these statements is NOT TRUE? Scientists propose explanations that can be explained by examining evidence. Scientists propose explanations that can be explained by examining evidence. Science is an organized way to investigate, understand, and explain events in the natural world. Science is an organized way to investigate, understand, and explain events in the natural world. Scientists collect and organize information randomly, looking for patterns and connections between events. Scientists collect and organize information randomly, looking for patterns and connections between events. Science deals only with the natural world.
Answer:
The correct option is;
Scientist propose explanations that can be explained by examining evidence
Explanation:
A scientists makes an hypotheses based on possible natural processes to explain the origin and/or the nature of the characteristics of a natural observation. The scientist then source more data and information to put their hypotheses to test. Due to the fact that an hypotheses is based on observable processes and/or mechanisms, the given hypotheses can be further tested by other scientists through the use of their individually sourced data. From the result of the assessment, the hypotheses can be either accepted or rejected to enable the better clarification of the hypotheses when accepted or the development of a new hypotheses when rejected.
Round to 4 significant figures.
0.007062
Answer:
Hey there!
This is already rounded to four significant figures!
Zeroes after the decimal but before the 7 don't count, and 7, 0, 6, and 2 count as significant figures.
So, the answer would be 0.007062.
Let me know if this helps :)
4 significant figures are there in 0.007062.
What are significant figures?“The term significant figures refer to the number of important single digits (0 through 9 inclusive) in the coefficient of an expression in scientific notation.
The number of significant figures in an expression indicates the confidence or precision with which an engineer or scientist states a quantity.”
Zeroes after the decimal but before the 7 don't count, and 7, 0, 6, and 2 count as significant figures.
Hence, 4 significant figures are there in 0.007062.
Learn more about significant figures here:
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Placing a sample of iron (II) oxide into a graduated cylinder makes the water volume increase 12.0 mL. The weight of the sample is 76.6 g. What is its density? (Round to the nearest hundredths) g/cm3
Answer:6.38
Explanation:D=76.6/12
What is the total number of sp2-hybridized carbon atoms present in the fluorophore used in the experiments
Answer:
9
Explanation:
The structure of fluorophore used in the experiments has been drawn in the attachment. And from the drawing counting we can say that there are 9 sp2-hybridized carbon atoms present. Fiuorophores are a fluorescent chemical compound that can re-emit light upon light excitation. Normally used to produce absorbance and emission spectra.
help! science what usually has the greasiest density 1. plasma 2. liquid 3. gas 4. solid
Answer:soild
Explanation:
Answer:
I think that it is a solid that has the greatest density
how many nickel atoms are in a nickel coin with a mass of 3.95g
Answer:
4.05 × 10²² atoms
Explanation:
Step 1: Given data
Mass of nickel: 3.95 g
Step 2: Calculate the moles corresponding to 3.95 g of nickel
The molar mass of nickel is 58.69 g/mol.
3.95 g × (1 mol/58.69 g) = 0.0673 mol
Step 3: Calculate the atoms in 0.0673 moles of nickel
We will use Avogadro's number: there are 6.02 × 10²³ atoms of nickel in 1 mole of atoms of nickel.
0.0673 mol × (6.02 × 10²³ atoms/1 mol) = 4.05 × 10²² atoms
What is most likely to react strongly with an acid? A. Noble gases B. All of these C. Lemon juice D. Metal hydroxides
Answer:
I think is B) All of these
Explanation:
Hey, there!!
The answer us option D.
Because acids easily reacts with metalic hydroxides to form salt and water.
[tex]hcl(aq) + naoh(aq) \: = h2o \: + \: nacl[/tex]
For option A, B and C.
nobel gaeses donot react as they already have stable electronic configuration. All of this is not correct.Lemon juice is itself a citric acid.SO, THE ANSWER IS OPTION D.
Hope it helps
Which of the following is a chemical property? Select one: a. The air pressure at sea level is higher than that in Denver, Colorado. b. Water boils at 100°C. c. The rusting of the joints of a metal children’s swing set.
Answer:
c. The rusting of the joints of a metal children’s swing set.
Explanation:
By definition, chemical property describes the ability of a substance to undergo a specific chemical change.
In the definition above, the key words are; "Chemical change".
Generally, chemical changes are irreversible. This means we just have t observe the options and pick the one that contains an irreversible change.
Upon doing ths, the correct option is;
c. The rusting of the joints of a metal children’s swing set.
This is because rusting is a chemical change and is irreversible.
what is true of chemicals a- chemicals are never dangerous b- things containing chemicals cost alot of money c-chemicals are rarely found on earth d- chemicals are in many substances at home
Answer: option d
Explanation:
Because every thing in our home is made from chemicals
How much heat (in J) must be added to raise the temperature of 1.90 mol of air from 18.0°C to 37.0°C at constant volume? Assume air is completely diatomic.
Answer:
The amount of heat that must be added to raise the temperature of 1.90 mol of air from 18.0 ° C to 37.0 ° C at constant volume is 749. 9775 J
Explanation:
The properties cv and cp are called specific heats (or heat capacities) because, under certain special conditions, they relate the change in temperature of a system to the amount of energy added by heat transfer. Its SI units are [tex]\frac{J}{kg K}[/tex] or [tex]\frac{J}{mol K}[/tex]. Two specific heats are defined for gases, one for constant volume (cv) and the other for constant pressure (cp).
In the case of constant volume heating, the amount of heat entering the gas is equal to
Q=Cv*n*(Tfinal - Tinitial)
In this case:
Air, being considered a diatomic gas, will have a molar heat capacity of: [tex]Cv=\frac{5}{2}R[/tex] where R is the general gas constant, whose value in this case will be [tex]R= 8.31 \frac{J}{mol K}[/tex]n=1.90 molTfinal= 37 °CTinitial= 18 °CReplacing:
[tex]Q=\frac{5}{2} *8.31 \frac{J}{mol K} *1.90 mol* (37 - 18)[/tex]
Taking into account that the difference in degrees kelvin is equal to the difference in degrees Celsius, and solving you get:
[tex]Q=\frac{5}{2} *8.31 \frac{J}{mol K} *1.90 mol* 19 K[/tex]
Q= 749. 9775 J
The amount of heat that must be added to raise the temperature of 1.90 mol of air from 18.0 ° C to 37.0 ° C at constant volume is 749. 9775 J
Which example is most likely an inorganic compound? A. methane, which is made of carbon and hydrogen B. glucose, which is a sugar made by plants C. sodium chloride, which is a salt D. human DNA, which is a molecule in cells
Answer:
C
Explanation:
Answer:
CCCCCCCCCC.
Explanation:
6.02 x 1023
Significant figures
Answer:
It depends on the number of significant figures you are changing to
Explanation:
6.02×1023=6158.46
1 sig fig = 6000
2 sig fig = 6200
3 sig fig = 6160
4 sig fig = 6158
5 sig fig = 6158.5
6 sig fig = 6158.46
When solving significant figures you have to consider the number after each number like in the case of changing to two sig fig the number following one is five and when the number is up to or greater than five you add a value of one to the number before it. But in a case where the number is less than five you just leave it like that like in the case of changing to one sig fig
In the video, the experimenter used a model to represent a phenomenon observed in the natural world. What did the light and each of the flasks represent in this model?
Answer:
The light represented the Sun, and each of the flasks represented the atmosphere, but with different compositions. One flask had a higher carbon dioxide concentration than the other.
Explanation:
.239cal=J joules. How many joules J are in 450cal?
Answer:
1.89
Explanation:
238cal = J joules
450cal = xJ joules
[tex] \frac{450}{238} = \frac{xj}{j} [/tex]
1.89 = x
450cal = 1.89J joules
An aircraft flew 4,000km in 5 hours. What was its average speed? Give you answer in km/hr.
Convert 75 miles/hour to km/s.
Explanation:
0.033528 Kilometers per second
What is the temperature -71 oC expressed in Kelvin?
Group of answer choices
Answer: 202.15
Explanation:
-71°C + 273.15
= 202.15K
Why are fossil fuels like coal, oil, and natural gas
called nonrenewable resources?
Answer:
Because they cant be used again
Explanation:
like plastic is renewable because you can recycle it and it will be the same
Can Individual atoms be moved and rearranged ?
Answer:
Yes
Explanation:
Scientists using the latest microscopic technology have found they can move individual atoms around a surface at will, a breakthrough that could have profound implications in the ultra-small world of electronics and even in industry