Answer:
D. Mass number
Explanation:
atomic number is constant since the number of protons and electrons is equal
number of protons is always the same as the number of electrons
the number of neutrons vary from the number of protons therefore causing the difference in mass numbers
Answer:
D. mass number
Explanation:
Compare the oxygen consumption of a sprinter and a marathon runner
pls give accurate answer
and answer it quickly.
Answer:
A sprinter consumes more oxygen than a marathon runner.
Explanation:
A sprinter requires big amounts of air in a short time to not get tired as fast and run faster. A marathon runner has more controlled and paced breathing so he does not get tired but can run long distances. Marathon runners also run slower than sprinters.
Describe the composition of Earth’s atmosphere
A drop of water contains 2 x 104 bacteria. How many bacteria are in 100 gallons of water? [1 drop = 1 mL]
Answer:
7.57×10⁹ bacteria.
Explanation:
We'll begin by convert 100 gallons of water to millilitres (mL). This can be obtained as follow:
1 gallon = 3785.41 mL
Therefore,
100 gallons = 100 gallon × 3785.41 mL / 1 gallon
100 gallons = 378541 mL
Therefore, 100 gallons of water is equivalent to 378541 mL.
Next, we shall convert 378541 mL to drop of water. This can be obtained as follow:
1 mL = 1 drop
Therefore,
378541 mL = 378541 mL × 1 drop/ 1 mL
378541 mL = 378541 drop
Therefore, 378541 mL is equivalent to 378541 drops of water.
Finally, we shall determine the number of bacteria in 378541 drops of water as follow:
1 drop = 2×10⁴ bacteria
Therefore,
378541 drop = 378541 drop × 2×10⁴ bacteria / 1 drop
378541 drop = 7.57×10⁹ bacteria.
Therefore, there are 7.57×10⁹ bacteria in 100 gallons of water
ok so whats the answer
Answer:
Is there a question?
Explanation:
Help help help ASFAP
Answer:
A directory of relatives' phone numbers
Hope this helps
Explanation:
How many atoms are in 8g of Oxygen (O2)?
Answer:
There are 3.011 × 10^23 oxygen atoms
Each element has a different:
O number of protons and electrons
O atomic mass and weight
O Properties and characteristics
O number of neutrons
Answer:
Can someone help with this plase
Explanation:
Do you still need any help ?
The total volume required to reach the endpoint of a titration required more than the 50 mL total volume of the buret. An initial volume of 49.17±0.04 mL was delivered, the buret was refilled, and an additional 1.56±0.04 mL was delivered before the endpoint was reached. The titration of a blank solution without the analyte required 0.60±0.04 mL . Calculate the endpoint volume corrected for the blank and its absolute uncertainty. Note: Significant figures are graded for this problem. To avoid rounding errors, do not round your answers until the very end of your calculations. volume: mL ± mL
Answer:
The answer is "[tex]\bold{50.42 \pm 0.08}[/tex]".
Explanation:
Overall delivered volume [tex]= [(49.06 \pm 0.05) + (1.77 \pm 0.05)]\ mL[/tex]
Its blank solution without any of the required analysis [tex]= (0.41 \pm 0.04)\ mL[/tex]
Compute the volume of the endpoint as follows:
Formula:
[tex]\text{End point volume = Total Volume delivered - volume required}[/tex]
[tex]= (49.06 \pm 0.05) + (1.77 \pm 0.05) - (0.41 \pm 0.04) \\\\= (49.06 + 1.77 - 0.41) \pm \ \ (absolute \ \ uncertainty)[/tex]
therefore,
absolute uncertainty [tex]=\sqrt{(0.05)^2 + (0.05)^2 + (0.04)^2}[/tex]
[tex]=\sqrt{0.0025 +0.0025 +0.0016} \\ \\=\sqrt{0.0066}\\\\=0.08124\\[/tex]
The Endpoint volume [tex]= (49.06+1.77-0.41)\pm (0.08124)[/tex]
[tex]= 50.42 \pm 0.08[/tex]
Therefore, the volume of the endpoint adjusted for the blank is:
[tex]\bold { = 50.42 \pm 0.08}[/tex]
Select the false statement regarding the properties of liquids. Viscosity is the resistance of a liquid to flowing. Cohesion and adhesion help to explain capillary action. Adhesion is the attraction of atoms and molecules to like particles. Liquids with strong intermolecular forces tend to have high surface tensions. The tendency of a liquid to minimize its surface is referred to as surface tension.
Answer:
Adhesion is the attraction of atoms and molecules to like particles.
Explanation:
Liquid as a state of matter is defined by certain properties. According to this question, the following description of the properties of liquids are true except that Adhesion is the attraction of atoms and molecules to UNLIKE PARTICLES.
- Viscosity, as rightly stated, is the resistance of a liquid to flowing
- Capillary action, which is the pulling up of a liquid against gravity, is aided by the cohesive and adhesive properties of that liquid.
- Surface tension, which is the energy required to resist external forces, thereby increasing its surface area, is dependent on the strength of the intermolecular forces of the liquid particles.
- Surface tension, according to this question, is the ability of a liquid to minimize its surface area.
The above points are true except adhesion is the attraction of atoms and molecules to like particles, which is false.
Infer: The metric system uses prefixes to tell you how much to multiply the base unit by. For example, in the metric system, the base unit for length is the meter. Examples of prefixes include kilo-, centi-, and milli-.
Knowing that 1,000 meters are in 1 kilometer, what do you think the prefix kilo- means?
Answer:
kilo means one thousand
Explanation:
Seeing as there are 1000 metres in one kilometre
Knowing that 1,000 meters are in 1 kilometer, The prefix kilo means 1000 or 1 kilogram (kg).
What is the metric system?The metric system is the system that uses gram, liter, and meter as the base unit for measuring the distance, volume, and length of any object or entity.
The metric system was started in France in 1970. There are common seven units in the metric system. The three main base units are gram, liter, and meter.
A liter is used to measure the Volume. Grams are used to measuring the quantity of a solid item. Meter is used to measure the distance or length of anything.
The kilogram is the base unit for measuring the quantity of any solid item, such as rice, and 1 kg of rice is the quantity of rice.
Thus, the prefix kilo means 1000 or 1 kilogram (kg).
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If a compound with a density of 9.0 g/cm^3 occupies 37.6 in^3, what is its mass in kg?
2.54 cm = 1 in
Answer:
V = m d = 14 830 g × 1 c m ³ 19.32 g = 767.6 cm³
HURRY PLEASE. All of the following are threats to biodiversity EXCEPT a. habitat destruction. b. gene pool diversity. c. pollution. d. exotic species.
Answer:
i think its A
Explanation:
Answer:
i think its b gene pool diversity
Explanation: hope this helps :)
For clouds to form, water must vapor
Answer:
true
Explanation:
Read the scenario, and then answer the question that follows. Randy is the chief technology officer of a growing company. The company he works for is considering their software needs. The company currently has a few licenses for a proprietary software solution, but will need to greatly expand their operations quickly. The company has asked Randy to recommend a software solution that will allow the company’s engineers to customize the software to fit the specific functions and duties of the company’s employees, and to cheaply expand their operations to other office branches. Which of the following options would best fit Randy’s needs?
Answer:
B (implement an open source software solution) I'm late sorry
Explanation:
Answer:b
Explanation:
b
Excess ammonia (NH3) is added to 5.137 grams of seaborgium hexachloride. The only products are 4.146 grams of a solid containing only seaborgium, nitrogen, and chlorine and 1.174 grams of a gas. The gas is 97.23% chlorine, and the remainder is hydrogen. The empirical formula of the gas is HCl. What fraction of the chlorine from the original compound is in the solid after the reaction?
Answer:
[tex]w_{Cl}=0.5028[/tex]
Explanation:
Hello.
In this case, a partial chemical reaction can be written as:
[tex]NH_3+SgCl_6\rightarrow HCl+solid[/tex]
Thus, the mass of chlorine in the initial seaborgium hexachloride (molar mass: 475.718 g/mol) is:
[tex]m_{Cl}=5.137gSgCl_6*\frac{6*35.45gCl}{475.718 gSgCl_6} =2.297gCl[/tex]
Which is also the total chlorine. Moreover, the chlorine from the HCl is:
[tex]m_{Cl\ in \ HCl}=1.174gHCl*0.9723=1.142g[/tex]
It means that the chlorine in the solid is:
[tex]m_{Cl\ in\ solid}=2.297gCl-1.142gCl=1.155gCl[/tex]
Therefore, the required fraction (w) is computed by dividing the mass of chlorine in the solid by the mass of chlorine in the initial seaborgium hexachloride as the only source of chlorine at the beginning:
[tex]w_{Cl}=\frac{1.155g}{2.297g}\\ \\w_{Cl}=0.5028[/tex]
Best regards.
Predict the product for the following reaction:
Н,0, Н
ОН
ООО
ОН
atomic weight of lithium ?
Answer:
6.941
Explanation:
Which is a feature of a single replacement reaction?
Substance XYZ breaks down into X and YZ.
Substance G reacts with compound XY to form GY and X.
Substance X burns rapidly in the presence of oxygen.
Substance QR and GT exchange ions with each other.
Answer:
Substance G reacts with compound XY to form GY and X.
Explanation:
B. Substance G reacts with compound XY to form GY and X.
What is single replacement reaction?
A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound. When a replacement reaction occurs, a new aqueous compound and a different pure element will be generated as products.For example:2HCl(aq) + Zn(s) → ZnCl₂(aq) + H₂(g)
Therefore, correct option is B.
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The temperature of a container of oxygen gas is increased from 149 k to 298 k which of the following statement is true, Explain:
A. The average kinetic energy of the oxygen molecules in the container decreases.
B. The average chemical potential energy of the oxygen molecules in the container increases.
C. The average kinetic energy of the oxygen molecules in the container increases.
D. The average chemical potential energy of the oxygen molecules in the container decreases.
Answer:
The average kinetic energy of the oxygen molecules in the container increases
Explanation:
I searched up, "what happens when the temperature of oxygen gas is increased''
As the temperature increases, the average kinetic energy increases as does the velocity of the gas particles hitting the walls of the container. The force exerted by the particles per unit of area on the container is the pressure, so as the temperature increases the pressure must also increase.
this is the answer google gave me so im not sure of you should 100% trust it but its better than nothing
The temperature of a container of oxygen gas is increased from 149 k to 298 k then the average kinetic energy of the oxygen molecules in the container increases. Thus option C is true.
What is kinetic energy?A kinetic energy is defined as a form of energy that an object or particle has by its motion.
It can be expressed as
K.E. = 1/2 mv²
There are basically three types of kinetic energy.
Translational kinetic energyRotational kinetic energyVibrational kinetic energyThe average kinetic energy is a product of half of the mass of each gaseous molecules.
The average kinetic energy is directly proportional to temperature.
Thus, the temperature of a container of oxygen gas is increased from 149 k to 298 k then the average kinetic energy of the oxygen molecules in the container increases. Thus option C is true.
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a swimming pool has a volume of 166.9 cubic meters. how many gallons of water can the pool hold
Answer:
V=44090.30 gallons
Explanation:
Given that,
Volume of a swimming pool is 166.9 m³.
We need to find m³ to gallons.
We know that the conversion from m³ to gallon is given by :
[tex]1\ \text{m}^3=264.172\ \text{gallons}[/tex]
To convert 166.9 m³ to gallons, multiply it by 264.172. So,
[tex]166.9\ \text{m}^3=166.9 \times 264.172\ \text{gallon}\\\\=44090.30\ \text{gallon}[/tex]
It can hold 44090.30 gallons of water.
Which statement below is the BEST explanation for the differences
between electronic and molecular structures?
A) Lone pair electrons cannot be seen and take up more space which makes the
electronic & molecular shapes different.
B)The bond angles are different when there are lone pairs, which makes the
electronic & molecular shapes different.
C)Bonding electrons can be seen, which makes the electronic & molecular shapes
different
Answer:
A
Explanation:
Electron geometry describes the arrangement of electron groups. Molecular geometry describes the arrangement of atoms, excluding lone pairs.
The chemical formula for carbonic acid, a compound used in carbonated drinks, is H2CO3. Assume that these symbols represent the three
elements of this compound:
carbon
oxygen
hydrogen
Which picture correctly represents carbonic acid?
The chemical formula of carbonic acid is H₂CO₃ and in the structure form it will be represented according to the first structure.
What are acids?Acids are those substances which are having carboxylic group (-COOH) as a funtional group in it.
Given molecular formula of carbonic acids is H₂CO₃, in which one carbon atom is present in carboxylic group. In the molecule two hydrogen atoms are present and one of them is present in -COOH group and all three oxygen atoms are attached with carbon atom.
Hence the first image shows the structure of carbonic acid.
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hat volume of a 0.540 M NaOH solution contains 12.5 g NaOH
Answer:
At 0.58 L of 0.540 M NaOH solution contain 12.5 g NaOH.
Explanation:
Given data:
At volume = ?
Mass of NaOH = 12.5 g
Molarity of solution = 0.540 M
Solution:
First of all we will calculate the number of moles of sodium hydroxide.
Number of moles = mass/molar mass
Number of moles = 12.5 g / 40 g/mol
Number of moles = 0.3125 mol
Volume of NaOH:
Molarity = number of moles / volume in L
Now we will put the values.
0.540 M = 0.3125 mol / volume in L
volume in L = 0.3125 mol / 0.540 mol/L
volume in L = 0.58 L
Construct the electron dot diagram for chlorine.
Step 1: Use the periodic table to find the chemical symbol
for chlorine.
The symbol for chlorine is:
СІ
Со
Cr
I will mark u braniest xcl XD
The chemical symbol for chlorine is Cl, which is derived from its Latin name "chlorum."
How to explainThe periodic table assigns unique symbols to each element as a shorthand notation. Chlorine is a halogen element with atomic number 17, and its symbol reflects this designation.
It is a highly reactive, greenish-yellow gas at room temperature and is commonly used as a disinfectant and in the production of various chemicals. Chlorine is an essential element in maintaining public health and is widely employed in water treatment processes to kill bacteria, viruses, and other microorganisms.
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Which option is an example of a chemical change?
fireworks exploding
grinding powder
ironing a shirt
melting cheese
Answer:
the answer would be A. fireworks exploding
Explanation:
I TOOOK The test and i got thisone wrong lol so i reviwed what
i got wrong
Answer:
Fireworks exploding
(yes, i know i'm late UvU )
Until a train is a safe distance from the station it must travel at 5 m/s Once the train is on open track it can speed up
to 45 mls. If it takes a train 8 seconds to reach 45 m/s, what is the acceleration of the train? (Round your answer to
the nearest whole number)
4 m/s2
5 m/s2
6 m/s2
7 m's?
Answer:
5 m/s²
Explanation:
From the question given above, it took 8 s for the train to get to a speed of 45 m/s. This simply means the train was maintaining 5 m/s as it travels in order to get to an open track.
Thus, we obtained the following data from the question.
Initial velocity (u) = 5 m/s
Final velocity (v) = 45 m/s
Time (t) = 8 s
Acceleration (a) =.?
Acceleration is simply defined as the rate of change of velocity with time. Mathematically, it can be expressed as:
a = (v – u) /t
Where:
a is the acceleration.
v is the final velocity.
u is the initial velocity.
t is the time.
With the above formula, we can obtain the velocity of the train as follow:
Initial velocity (u) = 5 m/s
Final velocity (v) = 45 m/s
Time (t) = 8 s
Acceleration (a) =.?
a = (v – u) /t
a = (45 – 5) / 8
a = 40/8
a = 5 m/s²
Therefore, the acceleration of the train is 5 m/s².
Answer:
Its B =)
Explanation:
When alpha particles were shot at a gold foil target, most of the particles were undeflected. This indicated to Rutherford that:______.
a) the gold foil was continuous matter.
b) the mass of the gold atoms was spread out thinly.
c) the atoms of gold were mostly empty space.
d) the alpha particles had great penetrating power.
e) the alpha particles had charges opposite to those on the nuclei.
Answer:
c) the atoms of gold were mostly empty space.
Explanation:
When alpha particles were shot at a gold foil target, most of the particles were un-deflected . It proved that the atom is mostly empty . The alpha particle enters the atom its velocity remains unchanged . Alpha particle has great kinetic energy due to great mass . So when it remains undeflected mostly that means the nucleus has great empty space through which alpha particle sails smoothly .
Use the worked example above to help you solve this problem. An electrical heater is operated by applying a potential difference of 49.4 V to nichrome wire of total resistance 8.04 Ω. (a) Find the current carried by the wire and the power rating of the heater. I = 6.14 Correct: Your answer is correct. A P = 303.5 Correct: Your answer is correct. W (b) Using this heater, how long would it take to heat 2.10 103 moles of diatomic gas (e.g., a mixture of oxygen and nitrogen, or air) from a chilly 10°C to 25°C? Take the molar specific heat at constant volume of air to be 5 2 R. s (c) How many kilowatt-hours of electricity are used during the time calculated in part (b) and at what cost, at $0.14 per kilowatt-hour? U = kWh cost $ EXERCISEHINTS: GETTING STARTED | I'M STUCK! (a) A hot-water heater is rated at 4.69 103 W and operates at 2.40 102 V. Find the resistance in the heating element and the current. R = Ω I = A (b) How long does it take to heat 125 L of water from 25.6°C to 54.0°C, neglecting conduction and other losses? (The specific heat of water is 4.186 J/g · K.) s (c) How much does it cost at $0.14/kWh? $
Answer:
Part A:
a) Current = 6.14 A; Power = 303.5 W
b) time = 0.6 hours
c) cost = $ 0.025
Part 2:
a) Resistance = 12.28 ohms; Current = 19.54 A
b) time = 0.88 hours
c) cost = $0.578
Explanation:
The explanation is found in the attachments below:
Consider the element in the periodic table that is directly to the right of the element identified in part (a). Would the 1s peak of this element appear to the left of, the right of, or in the same position as the 1s peak of the element in part (a)? Explain your reasoning.
The question is incomplete. Here is the complete question.
The photoelectron spectroscopy is shwon below.
(a) Based on the photoelectron spectrum, identify the unknown element and write its electron configuration.
(b) Consider the element in the periodic table that is directly to the right of the element identified in part (a). Would the 1s peak of this element appear to the left of, the right of, or in the same position as the 1s peak of the element in part (a)? Explain your reasoning.
Answer and Explanation: Photoelectron Spectroscopy is a method of determinining the relative energy of electrons in atoms and molecules.
It is based on the photoelectric effect: when a radiation energy incides on a substance, an electron is ejected from it. If we know the kinetic energy of the ejected electron, known as photoelectrons, and the energy of the incident radiation, it is possible to find the energy of the electron in the substance.
The energy needed to eject an electron from the sample is called Binding Energy and in an atom, depends on which shell the electron is: valence eletrons (outermost shell), binding energy is lower; core eletrons (innermost shell), binding energy is highest.
In the graph, vertical axis shows 5 peaks for different energies. The peak closer to the origin, the leftmost peak, correspond to the 1s subshell, since their are closest to the nucleus, and so, has the highest binding energy.
Following from left to the right, we noticed:
First, second and fourth peaks has the same height;Third peak's height is 3x higher than 1st, 2nd and 4th;Fifth peak is one unit higher than first, second and fourth;(a) Then, we can conclude the eletron configuration of the element is
[tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{3}[/tex]
which is Phosphorus with atomic number of 15.
(b) The element to the right of element P is Sulfur (S). The peak 1s of sulfur will appear in the same position as the 1s peak of Phosphorus, because the elements in the Periodic Table are grouped according to certain properties. Elements in the same horizontal line are elements in the same period, which one of the characteristics is they have the same total number of electron shells.
Jose is sweating after winning his 100-meter race.
Answer: What is the question?
Explanation:
