Answer:
D
Explanation:
You balance an equation so that all the elements have the same number of atoms on each side of the equation.
beta-plus decay sodium protons and neutrons
Answer:
(β-decay) is a type of radioactive decay in which a beta particle (fast energetic electron or positron) is emitted from an atomic nucleus, transforming the original nuclide to an isobar of that nuclide. For example, beta decay of a neutron transforms it into a proton by the emission of an electron accompanied by an antineutrino; or, conversely a proton is converted into a neutron by the emission of a positron with a neutrino in so-called positron emission.
Explanation:
Answer:
Beta decay occurs when, in a nucleus with too many protons or too many neutrons, one of the protons or neutrons is transformed into the other. ... In beta plus decay, a proton decays into a neutron, a positron, and a neutrino: p Æ n + e+ +n.
Explanation:
HELP ME PLS
What is the mass of a water molecule if the hydrogens each have one neutron and the oxygen has eight neutrons?
a. 10
b. 12
c. 16
d. 20
Answer:
H2O
=(1×2)+(8)
=20
Explanation:
We have 1 Hydrogen(H) and 8 Oxygen(O)neutrons . Following the molecule formula, H2O, which means we have 2 Hydrogen that needs to times with 1 neutron;and we have only 1 Oxygen which has 8 neutrons. So 2 (H) have to times 1 and 1(O) have to times 8.
SOMEBODY PLEASE HELP ME ASAP. WILL GIVE BRAINLIEST TO BEST ANSWER.
Answer:
135.80 g of Ag
Explanation:
[tex]40gCu *\frac{1mol Cu}{63.546g Cu} *\frac{2mol Ag}{1molCu} *\frac{107.868g Ag}{1mol Ag}[/tex]
~ 135.80 g of Ag
Which is closer to the Sun—Neptune or the Earth?
O A.
The distance from the Earth to the Sun cannot be determined.
OB.
The Earth is closer to the Sun than Neptune is.
OC. They are the same distance from the Sun.
OD.
Neptune is closer to the Sun than the Earth is.
Answer: The earth is closer to the sun than neptune is
Explanation:
Answer:
The Earth is closer to the Sun than Neptune is.
Explanation:
pov
In the lab jill mixed 3 gases together. The resulting pressure was 930 mmHg carbon dioxide had a partial pressure of .70 atm and oxygen had a partial pressure of 680 mmHg. What is the partial pressure of nitrogen in kPa
Answer:
26.2kPa is the partial pressure of nitrogen
Explanation:
Assuming the partial pressure of Carbon dioxide is 0.070atm
The total pressure of a mixture of 3 gases (CO2, O2 and N2) is:
Total pressure = Partial pressure CO2 + Partial pressure O2 + Partial pressure N2
0.070atm CO2 are:
0.070atm * (760mmHg / 1atm) 53.2mmHg
Replacing:
930mmHg = 53.2mmHg + 680mmHg + Partial pressure N2
Partial Pressure N2 = 196.8mmHg
In kPa -101.325kPa = 760mmHg-
196.8mmHg * (101.325kPa / 760mmHg) =
26.2kPa is the partial pressure of nitrogenPlz Answer this if you Answer this right you will get brainliest
Don't Answer this question if you don't know you will be reported
Reaction 1 :-
AlZn²⁺Zn²⁺AlReaction 2 :-
LiAl³⁺Al³⁺Li____________________A 50,000 g septic tank reading reports that methane gas bubbles are present with a concentration of 17 ppm
Answer:
[tex]m_{solute}=0.85g[/tex]
Explanation:
Hello there!
In this case, according to the given information for the parts per million of methane in this solution, it is possible for us to first write the equation for this unit of concentration as shown below:
[tex]ppm=\frac{m_{solute}}{m_{solvent}} *1x10^6[/tex]
In such a way, since the septic tank has a mass of 50,000 g, the mass of methane into it is calculated as shown below:
[tex]m_{solute}=\frac{ppm*m_{solvent}}{1x10^6}[/tex]
Now, we plug in the numbers to obtain:
[tex]m_{solute}=\frac{17*50000g}{1x10^6}\\\\m_{solute}=0.85g[/tex]
Regards!
Giving Bainliest!!!!!
In 2-3 sentences, describe the basic properties of waves including frequency, amplitude, wavelength, and speed.
Answer:
frequency: This is the number of oscillations in one second or number of complete wavelengths produced in one second.Amplitude: This is the maximum displacement of a particle from its mean position.Wavelength: This is the distance between one crest and another or one trough and another.Speed: This is the distance a wave travels in a given amount of time.What is a decay series?
a series of reactions that never ends
a different form of chemical bonding
a chain of decays that results in a stable nucleus
a series of chemical reactions that ends with a decay\
HELPPPPPP
Answer:
a chain of decays that result in a stable nucleus
Explanation:
Decay series is a series of decay in which radioactive element is decomposed in different elements until it produces one stable atom.
Answer:
C
Explanation:
took test Edg
1
50.0 grams of an unknown metal is heated to 100.0°C and then placed in a calorimeter with 250.0 mL of water. If the final temperature of the
metal is 29.1°C and the calorimeter absorbed 824 Joules of energy, what
is the specific heat of the unknown metal? *
How many grams of KI would you need to prepare 0.50 g of 7.0% KI (m/m) solution?
Answer:
fomula; ( x = mutiplacation btw)
% m/m = m(solute) / m(solution) x 100%
0.50g x 70% = m/m x 100%
0.5g x 70% / 100% = 3.5 g KI
(both % cancle each other)
Explanation:
heads up might be wrong i did it myself
PLEASEEEE HELP :')
''If 5.6 mole of calcium metal is reacted, how many grams of calcium phosphide will form?'
Answer:
340 grams Ca₃P₂ (2 sig. figs.)
Explanation:
3Ca + 2P => Ca₃P₂
5.6 mole + excess => ? grams
Convert the 'known' to a coefficient of 1 by dividing all coefficients by 3.
=> Ca + 2/3P => 1/3Ca₃P₂
From the above, 1 mole of Ca => 1/3 mole Ca₃P₂
∴ 5.6 mole Ca in an excess of P => 1/3(5.6 mole) Ca₃P₂
=> 1.8666 mol Ca₃P₂ (calculator answer) ≅ 1.9 mol Ca₃P₂
=> 1.9 mole x 182 g Ca₃P₂/mol Ca₃P₂ = 339.73333 grams Ca₃P₂
≅ 340 grams Ca₃P₂ (2 sig. figs.)
Can someone pleasee help me with this asap!! Im struggling
4a. D - The last number in the configuration represents the group, in this case 3, and the number of shells represent the period, which is also 3.
4bi. Rubidium metal reacts very rapidly with water to form a colourless solution of rubidium hydroxide (RbOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is very exothermic and explosive.
4bii. Lithium is smaller in size than potassium . so valence electrons are more tightly held in Li than K. Due to larger size of K the valence electrons are loosely held and easy to remove the electron from K. Hence K is more reactive.
Chemical symbols stand for?
Answer Explanation:
If it is like H, or O or N or Na or Cl, those are the elements. Those are on the Periodic table. pH is the acidity and basicity of a substance, how acidic or basic(caustic) it is. mol is Moles. kPa is kilopascals. STP is standard temperature and pressure, at 0*C(Celsius), or 273.15 K(Kelvin), and 101,325 pascals, or 101.325 kilopascals.
Avagadro's Number is 6.022x10^23, the number of atoms in a mole. The Ideal Gas Law is P(Pressure in kPa) times V(Volume in L, liters) equals n(number of moles of gas) times R(the universal gas constant, or 8.3145 (L kPa/K mol) or 8.3145 liters kilopascals per Kelvin mole. that is just a few of them.
how are fossils discovered
How many moles are in 25.0 grams of KMnO4?
0.124 mol KMnO4
0.158 mol KMnO4
0.199 mol KMnO4
0.316 mol KMnO4
Answer:
158 mol :)
Explanation:
1.00 mole of an ideal gas occupies a volume of 22.4 L at 0 C and 760 mmHg (STP). It is cooled to -41 C while the pressure is increased to 805 mmHg. What is the new volume of the gas in liters?
Answer:
[tex]V_2=18.0L[/tex]
Explanation:
Hello there!
In this case, according to the given information, we infer that we need the combined gas law in order to solve this problem:
[tex]\frac{P_2V_2}{T_2}} =\frac{P_1V_1}{T_1}}[/tex]
Thus, by suing the temperatures in Kelvins, we can solve for the final volume as shown below:
[tex]V_2 =\frac{P_1V_1T_2}{T_1P_2}}\\\\V_2 =\frac{(760mmHg)(22.4L)(232K)}{(273K)(805mmHg)} \\\\V_2=18.0L[/tex]
Regards!
Define Acid and alkalis
Answer:
mark me brainliest
Explanation:
An acid is a substance that has a pH lower than 7. For example, hydrochloric acid, sulphuric acid, citric acid, ethanoic acid (vinegar). A base is a substance that neutralises an acid – those that dissolve in water are called alkalis. An alkali is a soluble substance with a pH higher than 7.
Answer:
The chemical which give hydrogen ion when dissolve in water is called acid.for example:HCL,HNO3,H2SO4 etc.
The bases that dissolve in water and produce hydroxyl ions are called alkalis.for example:NaOH,KOH etc.
Explanation:
What mass of copper metal will be formed when excess magnesium metal is reacted with:
(a) 250.0 mL of a 1.0 M copper M chloride solution (b) 100.0 mL of a 0.25 M copper (II) chloride solution
Answer:
A
Explanation:
Which of the following is a method for measuring energy in food?
A. reading the label
B. filtration
C. chromatography
D. calorimetry
Write the electronic configuration of the following element or ion and circle on their valance electrons
A.27 Al =
13
B. 31p-3
15
please answer my question now ! I will give you a Brinalist
1s2,2s2,2p6
Explanation:
electron arrangements
4.A high-quality sleeping bag will keep you warm even during a winter camping trip high in the mountains. How do you stay warm when the air around you is very cold?
A. The sleeping bag produces thermal energy that keeps you warm.
B. The sleeping bag transfers thermal energy from the air to your body.
C. The sleeping bag slows the transfer of thermal energy produced by your body into the air.
D. The sleeping bag increases the production of thermal energy by your body
Answer:
I think it's C
Explanation:
Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day!
Which statement about noble gases is correct? *
They are extremely rare in nature.
They are highly reactive with both metals and nonmetals.
O They exist as single atoms rather than as molecules.
O They form compounds with very bright colors.
Answer:
Hello There!!
Explanation:
I believe the answer is O They form compounds with very bright colors.
hope this helps,have a great day!!
~Pinky~
The statement about noble gases that is correct is D. They form compounds with very bright colors.
Noble gases simply refers to the elements that have similar properties. Noble gases are colorless, odorless, and have very low reactivity.
Examples of noble gases are helium, argon, Krypton, xenon, etc. Noble gases also form compounds with very bright colors.
In conclusion, the correct option is D.
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What mass of LiOH would need to be dissolved in water to make 300.0 mL of a solution with a pH of 11.33?
Execute Order 66________________
The mass of LiOH needed to make a 300 mL of a solution with a pH of 11.33 is 0.015 g
We'll begin by calculating the pOH of the solution.
pH = 11.33
pOH =?
pH + pOH = 14
11.33 + pOH = 14
Collect like terms
pOH = 14 – 11.33
pOH = 2.67 Next, we shall determine the concentration of hydroxide ion, OH⁻pOH = 2.67
Concentration of hydroxide ion [OH⁻] = ?pOH = –Log [OH⁻]
2.67 = –Log [OH⁻]
–2.67 = Log [OH⁻]
Take the as antilog of –2.67
[OH⁻] = antilog (–2.67)
[OH⁻] = 0.0021 MNext, we shall determine the concentration of LiOH.LiOH(aq) —> Li⁺(aq) + OH⁻(aq)
From the balanced equation above,
1 mole of LiOH contains 1 mole of OH⁻
Therefore,
0.0021 M LiOH will also contain 0.0021 M OH⁻.
Next, we shall determine the mole of LiOH in the solution.Molarity of LiOH = 0.0021 M
Volume = 300 mL = 300 / 1000 = 0.3 L
Mole of LiOH =?Mole = Molarity × volume
Mole of LiOH = 0.0021 × 0.3
Mole of LiOH = 0.00063 moleFinally, we shall determine the mass of LiOH needed to prepare the solution.Mole of LiOH = 0.00063 mole
Molar mass of LiOH = 7 + 16 + 1 = 24 g/mol
Mass of LiOH = ?Mass = mole × molar mass
Mass of LiOH = 0.00063 × 24
Mass of LiOH = 0.015 gTherefore, the mass of LiOH needed to prepare the solution is 0.015 g
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I need help everyone
Answer:
The answer is D
The last one
What is the role of the producer in any food chain?
Question 1 options:
Producers turn light energy into food energy
Producers make the food that consumers eat
Without producers, consumers would starve
All of these answers are correct
Answer:
All of these answers are correct.
Explanation:
They are all correct because producers make their food(energy) through photosynthesis, they provide food to herbivores and therefore the rest of the food chain, and without them, the food chain would collapse and all the consumers would starve.
____ are pieces of information that describe the appearance of the cell's content.
I think the answer is organelles.
Why is this conveyor important for Earth?
Answer:
.
Explanation:
Answer:
The great ocean conveyor plays a highly significant part in the climate of the planet. It transports heat to the Polar Regions, for example. In doing so, the amount of ice that can be formed in these regions is limited.
calculate the atomic mass of gallium if gallium has two naturally occurring isotopes with the following massess and natural abundances Ga-69 68.9256 amu 60.11% Ga-71 70.9247 amu 39.89
Answer: Atomic mass of gallium = 69.72304093 amu
Explanation:
We calculate the atomic mass of Gallium by using the Relative abundance of the isotopes.
Atomic mass =mass x Natural Abundance of Isotope 1 +mass x Natural Abundance of Isotope 2
(60.11/100 x 68.9256) + (39.89/100 x 70.9247)
= 41.43117816 + 28.29186283 = 69.72304093 amu
Two groups of students were given the same test. One group of students studied for 2 hours and the other group of students did not study at all. The group of students who studied achieved higher grades on the test. What is the DEPENDENT variable?
Answer:
Grade achieved is the dependent variable in the study.
Explanation:
A variable in any research or study is any property, characteristic, number, or a quantity which shows variability or change in its value i.e. it increases or decreases over time, depending on the treatment conditions.
There are two types of variables: Dependent variable and Independent variable.
An independent variable does not depent on any factor for its value or result, rather, a change units value brings about a change in the dependent variable.
A dependent variable is the variable which depends on some factor which the researcher controls. Any change made on the factor by the researcher would bring about a change on the dependent variable.
For example, in the given example above, studying habit affects academic performance. If a student studies more, his/her academic performance will improve as they will achieve higher grades. On the other hand, if a student fails to study, their academic performance will not show any improvement when compared to the group of students who studied. Thus, grade improvement depends on studying habit.
Therefore, grade obtained is the dependent variable in the study.