Answer:
The immune system
Explanation:
It defends from outside pathogens that may get into the body
What would happen if a hot piece of iron were placed in a bucket of water at room temperature? How do you know?
Note* this is a science answer so won't get confused if its a math question
Answer: Eventually, the metal will cool down and warm up. Overtime the metal and the water will come to the same temperature. This happens because the hot metal is giving energy to the water.
Explanation:This process is called thermal equilibrium. It's the same thing as when you put a spoon in hot tea the spoon gets hot and the tea cools down. Hope this helps!!
I need help I have a time limit please helpppp
Answer:
Is it D?
Explanation:
156 g sample of steel has a volume of 20.0mL What is the density of the steel sample?
__g/cm^3
Your answer should round to three significant figures.
Answer:
The answer is
7.80 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 156 g
1 mL = 1 cm³
20 mL = 20 cm³
volume = 20 cn³
The density of the metal is
[tex]density = \frac{156}{20} = \frac{39}{5} \\ [/tex]
We have the final answer as
7.80 g/cm³ to 3 significant figuresHope this helps you
How many atoms are there in one molecule of C2RS
Answer: 6.022×1023
Explanation: Chemists generally use the mole as the unit for the number of atoms or molecules of a material. One mole is equal to 6.022×1023 molecular entities and each element has a different molar mass depending on the weight of 6.022×1023 of its atoms (1 mole)
A sample of Element X is found to contain 67.25% of isotope type 1 (85.91) and 32.75% of isotope type 2 (87.91). Calculate the average atomic mass.
Answer:
The average atomic mass is 86.565
Explanation:
An element's average atomic mass is the sum of the products of the masses of the isotopes of the element and their percentage abundance divided by 100
The average atomic mass of the Element X is given as follows;
Isotope type 1 (85.91) ×
Isotope [tex]{}[/tex] Abundance (%) Mass /100 Portion of average mass
Type 1 [tex]{}[/tex] 67.25 × 85.91 ÷ 100 57.774475
Type 2 [tex]{}[/tex] 32.75 × 87.91 ÷ 100 28.790525
[tex]{}[/tex] Average atomic mass = 86.565
The average atomic mass = 86.565.
You are given given the density of an object to be 1.33 g/mL and the object's mass was measure to be 7.0 grams. Find the volume of the object.
Answer:
The answer is
5.26 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass = 7 g
density = 1.33 g/mL
The volume is
[tex]volume = \frac{7}{1.33} \\ = 5.26315789...[/tex]
We have the final answer as
5.26 mLHope this helps you
True or false: A mechanical wave starts with a disturbance in matter
Answer: A mechanical wave is a disturbance in matter that transfers energy through the matter. A mechanical wave starts when matter is disturbed. A source of energy is needed to disturb matter and start a mechanical wave.
Waves can be given as energy transmission without the net movement of the particles in the medium. The statement for the mechanical wave disturbs the matter is true.
What are the types of waves?The waves can be differentiated as mechanical, electromagnetic, and matter waves.
The mechanical waves can be described as the waves which are not able to transmit is the energy in the vacuum. Thus, the waves required a matter medium for the propagation of the energy.
The matter propagation results in the disturbance in the matter. Thus, the statement for the mechanical wave has been true.
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15)A photon has a frequency of 2.68 x 106 Hz. Calculate its energy.
Can you please show how you got it?
A photon has a frequency of 2.68 × [tex]10^6[/tex] Hz then the energy of a photon is [tex]1.78\times10^{-27}\text{J}[/tex].
What is meant by Planck's equation?
Planck's energy–frequency relation, or Planck's equation, gives the relationship between the energy of a photon and frequency. This equation is given by,
E = hv
Where, E be the energy of a photon
h be the Planck constant
v be the frequency
Given:
Frequency is 2.68 × [tex]10^6[/tex]
Planck's constant is 6.63 × [tex]10^{-34}[/tex] Js
The energy of a photon is given by,
E = hv
substitute the values in the above equation, we get
= 6.63 × [tex]10^{-34}[/tex] Js × 2.68 × [tex]10^6[/tex] Hz
simplifying the above equation, we get
= 1.78 × [tex]10^{-27}[/tex] J
The energy of the photon is 1.78 × [tex]10^{-27}[/tex] J.
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Someone pls help, I can't figure these problems out, I'm giving all of my brainly
Answer:
No, they dont have enough and they'd need 1 more quart of milk
Explanation:
lets see, 2 pints in a quart, if they have 6 quarts so 12 pints, they'd need 1 more quart to make 14 milkshakes
for 20, 6 12 oz bottles is 72 oz, 1/2 a gallon is only 64 so the 6 bottles is 8 more oz of water, Hoshi boght more
0
10
20
30
40
50
60
70
80
90
100g
100
200
300
400
500g
0
1
2
3
4
5
6
7
9
10g
mass =
Answer:
2047
Explanation:
What happens when current flows through a wire?
Answer: Two effects may occur during high current flow: 1) the wire may become overheated to the point that surface oxidation or even evaporation may take place, 2) at the connection points at each end of the wire, especially if the terminations are of a different type of metal than the wire, some atoms may migrate into or out of the wire.
what did we discover with this experiment
(Brainliest) Please Help! Please do not give me a random, gibberish answer or I will report you and give you a low rating therefore dropping your popularity. Also, if you don't know the answer you can put your guess in the comments. I will give a Brainliest and 50 points!
What mass of KBr is present in 75.0 mL of 0.250 M KBr solution?
Answer:
Answer : The correct answer for mass of KBr = 2.53 g
Given :
Molarity of KBr solution = 0.85 M
Volume of KBr solution = 25 mL
Converting volume from mL to L ( 1 L = 1000 mL )
Volume of solution = 25 mL * \frac{1 L }{1000mL}Volumeofsolution=25mL∗
1000mL
1L
Volume of solution = 0.025 L
Mass of KBr = ?
Mass of KBr can be calculated using following steps :
1) To find mole of Kbr :
Mole of KBr can be calculated using molarity .
Molarity : It is defined as mole of solute present in volume of solution in Liter .
It uses unit as M or \frac{mol}{L}
L
mol
It can be expressed as :
Molarity = \frac{mol of solute (mol)}{volume of solution (L)}Molarity=
volumeofsolution(L)
molofsolute(mol)
Plugging value of molarity and volume
0.85 \frac{mol}{L} = \frac{mol of Kbr}{0.025 L}0.85
L
mol
=
0.025L
molofKbr
Multiplying both side by 0.025 L
0.85 \frac{mol}{L} * 0.025 L = \frac{mole of KBr}{0.025 L} * 0.025 L0.85
L
mol
∗0.025L=
0.025L
moleofKBr
∗0.025L
Mole of KBr = 0.02125
2) To find mass of Kbr :
Mass of Kbr can be calculated using mole . Mole can be expressed as :
Mole (mol) = \frac{mass (g) }{molar mass \frac{g}{mol} }Mole(mol)=
molarmass
mol
g
mass(g)
Mole of Kbr = 0.02125 mol
Molar mass of KBr = 119.00 \frac{g}{mol}
mol
g
Plugging values in mole formula
0.02125 mol = \frac{mass (g)}{119.00 \frac{g}{mol}}0.02125mol=
119.00
mol
g
mass(g)
Multiplying both side by 119.00 \frac{g}{mol}
mol
g
0.02125 mol * 119.00 \frac{g}{mol} = \frac{mass (g)}{119.00 \frac{g}{mol}} * 119.00\frac{g}{mol}0.02125mol∗119.00
mol
g
=
119.00
mol
g
mass(g)
∗119.00
mol
g
Mass of KBr = 2.53 g
What is the energy of a wave with wavelength of 4.2 x 10-7 m. (Hint: Calculate for frequency first.)
A. 4.74 x 10-28 Joules
B. 4.74 x 10-19 Joules
C. 8.35 x 10-32 Joules
D. 2.79 x 10-40 Joules
Answer:
Option B. 4.74×10¯¹⁹ J.
Explanation:
The following data were obtained from the question:
Wavelength (λ) = 4.2×10¯⁷ m
Energy (E) =.?
Next, we shall determine the frequency of the wave. This can be obtained as follow:
Wavelength (λ) = 4.2×10¯⁷ m
Velocity (v) = constant = 3×10⁸ m/s
Frequency (f) =.?
v = λf
3×10⁸ = 4.2×10¯⁷ × f
Divide both side by 4.2×10¯⁷
f = 3×10⁸ / 4.2×10¯⁷
f = 7.143×10¹⁴ s¯¹
Therefore, the frequency of the wave is 7.143×10¹⁴ s¯¹.
Finally, we shall determine the energy of the wave using the following formula
E = hf
Where
E is the energy.
h is the Planck's constant
f is the frequency
Thus, the enery of the wave can be obtained as follow:
Frequency (f) = 7.143×10¹⁴ s¯¹.
Planck's constant = 6.63×10¯³⁴ Js
Energy (E) =..?
E = hf
E = 6.63×10¯³⁴ × 7.14×10¹⁴
E = 4.74×10¯¹⁹ J
Therefore, the energy of the wave is 4.74×10¯¹⁹ J.
Is a pH of 7 high pH or neutral??
Answer:
neutral
Explanation:
pH range goes from 0-14, since 7 is in between 0 and 14, it is neutral.
On the periodic table, columns go ________________?
What features form when rocks bend?
A block with a mass of 10g is dropped into a graduated cylinder with 20 mL of water. The water rises to 25 mL. What is the density of the rock?
Answer:
The answer is
2.0 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass of block = 10 g
volume = final volume of water - initial volume of water
volume = 25 - 20 = 5
volume = 5 mL
The density of the block is
[tex]density = \frac{10}{5} \\ [/tex]
We have the final answer as
2.0 g/mLHope this helps you
A brick has a mass of 4kg. It occupies 0.8 L of space. What is it the density of the brick?
Answer:
The answer is
5.0 kg/LExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass of brick = 4 kg
volume = 0.8 L
It's density is
[tex]density = \frac{4}{0.8} \\ [/tex]
We have the final answer as
5.0 kg/LHope this helps you
What is the net charge of an ion that has 11 protons 10electrons and 12 neutrons
Answer:positive
Explanation: because there are more protons than electrons in the ion
The only thing that is not matter is energy.
TRUE
FALSE
Answer:
true
Explanation:
What is the scientific notation of 36000x10 ex.10?
Answer:
3.6 times 10^4
Explanation:
Scientific notation is between 1-9. So, we move 36000 to 4 decimal places. SO it would be 3.6 times 10^4. Scientific Notation always has the base of 10 . Enjoy :)
Rank cesium, chlorine, and chromium in order of increasing electron affinity
A) Cs < Cr < Cl
B) Cl < Cr < Ce
C) Ce < Cl < Co
D) Ca < Cu < Cl
Answer:
Cs, Cr, Cl
Explanation:
The Placement Of The Elements Increase In Electro Affinity.
Which of the following compounds would you expect to be ionic?
O A. C2H6
O B. NH3
O C. H2O2
D. LiBr
None of the above.
O E.
Answer:
i think its c
The ionic compound from the options listed is : ( C ) H₂O₂
Ionic compounds are compounds formed by positively charged ions ( cation ) and negatively charged ions ( anions ) and they are neutrally charged because they are made up of equal number of positive and negative ions.
Ionic compounds are formed and held together by the electrostatic forces between the ions. Some examples of ionic compounds include ; Table salt ( NaCl ) , potassium chloride ( KCl )
Hence we can conclude that the ionic compound from the options listed is ) H₂O₂.
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Sodium carbonate solution reacts with dilute hydrochloric acid. The equation for the reaction is shown.
Na2CO3(aq) + 2HCl(aq) → 2NaCl(aq) + CO2(g) + H2O(l)
Excess sodium carbonate is added to 10.0cm3 of 0.10mol/ dm3 hydrochloric acid.
Which volume of carbon dioxide gas is made?
A 12cm3 B 24cm3 C 12000cm3 D 24000cm3
Answer:
12000cm³ is the answer
hope it helps you mate please mark me as brainliast
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, volume of carbon dioxide gas made is 11.2L.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
The balanced equation for the given reaction can be given as
Na[tex]_2[/tex]CO[tex]_3[/tex](aq) + 2HCl(aq) → 2NaCl(aq) + CO[tex]_2[/tex](g) + H2O(l)
moles of hydrochloric acid = 10.0dm³ × 0.10mol/ dm³
=1 mole
The mole ratio between carbon dioxide and HCl is 1:2.
mole of CO[tex]_2[/tex]=0.5 moles
volume of CO[tex]_2[/tex]=moles× 22.4
=0.5 ×22.4
=11.2L
Therefore, volume of carbon dioxide gas made is 11.2L.
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watch the truck and ladder animation. what is another name for newton's first law
Answer:
the law of inertia
Answer:
INERTIA
Explanation:
Which is the best step for Peta to take next? During a science lab, Peta poured two clear chemicals into different beakers. Afterward, he realized that he did not label the beakers so he could not tell the chemicals apart. smell them in order to identify them O taste them in order to identify them O mix them together and pour them down the drain O ask the teacher to dispose of them and start over
Answer:
d
Explanation:
because i took the test
Answer:
D
Explanation: took test and it was right
how is iteration used in engineering design? why is this such an important aspect of the process?
Answer:
The cycle of prototyping, testing, and refining that's at the core of iterative design offers numerous benefits: Testing gives you a valuable collection of user feedback that you can use to improve your site and to understand what's working for you. It helps you catch problems before they spiral out of control.
Iteration assists you in detecting problems before they go out of control.
What is Iteration?Iteration is a design technique that revolves around a cyclical process of developing, testing, evaluating, and refining a product or process. Changes and adjustments are made based on the outcomes of testing the most current version of a concept.
Iteration, or the cycle of prototyping, testing, and refining that is at the heart of iterative design, has multiple advantages. Testing provides you with a valuable collection of user input that you can use to develop your site and understand what works for you.
Hence, Iteration assists you in detecting problems before they go out of control.
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An organ like the brain is considered to be a living thing, how is it possible?
Answer: The brain is an organ, and a very unusual and complex one at that. It plays a role in every one of our functions, controlling many organs, our thoughts, memory, speech, and movements.
Explanation:
describe the difference between corrosion and rust
The main difference between corrosion and rust is that corrosion occurs as a result of the chemical influence and it affects a lot of materials whereas rusting is only accelerated by certain chemicals and usually affects iron substances
Hopes this helps :)
