Answer:
lead , chemical
Explanation:
if the atomic mass is 14 and the atomic number is 7,how many neutrons do you have?
Answer: 7 neutrons
Explanation: Atomic number refers to the number of protons in the nucleus of the atom. Also you can treat atomic mass as how many particles (protons and neutrons) are in the nucleus of the atom. So for this problem:
14 particles - 7 protons = 7 neutrons (and we know all that's left over is neutrons because we subtracted all the protons)
What is the total number of grams of a 32-gram sample of 32P remaining after 71.5 days of decay?
Answer:
1 g
Explanation:
The following data were obtained from the question:
Original amount (N₀) = 32 g
Time (t) = 71.5 days
Half-life of phosphorus (t½) = 14.3 days
Amount remaining (N) =?
Next, we shall determine the rate of disintegration. This can be obtained as follow:
Half-life of phosphorus (t½) = 14.3 days
Decay constant (K) =?
K = 0.693 / t½
K = 0.693 / 14.3
K = 0.0485 /day
Finally, we shall determine the amount remaining as illustrated below:
Original amount (N₀) = 32 g
Time (t) = 71.5 days
Decay constant (K) = 0.0485 /day
Amount remaining (N) =?
Log (N₀/N) = Kt/2.303
Log (32/N) = 0.0485 × 71.5 / 2.303
Log (32/N) = 3.46775 / 2.303
Log (32/N) = 1.5058
Take the antilog of 1.5058
32/N = antilog (1.5058)
32/N = 32.05
Cross multiply
32 = N × 32.05
Divide both side by 32.05
N = 32 / 32.05
N = 0.998 ≈ 1 g
Thus, the amount remaining after 71.5 days is approximately 1 g.
The half-life of a radioactive substance refers to the time taken for the substance to Decay to half of its initial size. Hence, the mass of the substance left after 71.5 days is 1 gram.
Initial mass = 32 g Half life = 14.3 daysAfter 14.3 days ;
32 / 2 = 16 gramsAfter 14.3 × 2 = 28.6 days :
16/2 = 8 gramsAfter 14.3 × 3 days = 42.9 days :
8 / 2 = 4 gramsAfter 14.3 × 4 days = 57.2 days :
4 /2 = 2 gramsAfter 14.3 × 5 days = 71.5 days :
2 /2 = 1 gram.Hence, the mass of the sample left after 71.5 days would be 1 gram.
Learn more : https://brainly.com/question/18766174
What charges would an atom of Cesium and Radium form based on the octet rule
Answer:
1+
Explanation:
Hope this helped!
2. Al(OH),(s) + 3 HCl(aq) à 3 H2O(l) + AlCl3(aq). This reaction shows how aluminum hydroxide
in antacid tablets neutralizes hydrochloric acid in the stomach. A tablet containing 0.25 g of
aluminum hydroxide is ingested by a patient with 0.88 g of hydrochloric acid in their stomach. Is
this tablet sufficient to neutralize the acid in the patient's stomach? Explain using stoichiometric
calculations. [4 marks]
I
This tablet insufficient to neutralize the acid in the patient's stomach
Further explanationReaction
Al(OH)₃(s) + 3HCl(aq) ⇒ 3 H₂O(l) + AlCl₃(aq)
0.25 g of Aluminum hydroxide-Al(OH)₃ , mol (MW=78 g/mol) :
[tex]\tt \dfrac{0.25}{78}=0.00321[/tex]
mol HCl : mol Al(OH)₃ = 3 : 1
[tex]\tt mol~HCl=3\times 0.00321=0.00963[/tex]
mass HCl (MW=36,46 g/mol) :
[tex]\tt 0.00963\times 36.46=0.351[/tex]
0.351 < 0.88⇒this tablet insufficient to neutralize the acid
The specific heat of a certain type of metal is 0.128 J/(g⋅∘C). What was the intial temperature if 0.305 kJ of heat is added to 94.8 g of metal to reach a temperature of 85.0 ∘C?
The intial temperature : 59.865 °C
Further explanationHeat added :
Q = m . c . ΔT
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
[tex]\tt 305=94.8\times 0.128\times (85-t_1)\\\\85-t_1=25.135\\\\t_1=59.865^oC[/tex]
How many moles are there in 12.5 g of methanol, CH3OH?
A) 0.0326 mol
B) 0.39 mol
C) 69.0 mol
D) 30.7 mol
Answer:
B (0.39 mol).
Explanation:
Hope this helped!
The volume of an object is 55mL in this city is 30g/mL. what is its mass
Answer:
Mass = 1650g
Explanation:
30g per mL is the density I suppose...
Solve for m!
30g/mL = m/55mL
Multiply by denominator to get numerator!
30* 55 =1650g
m = 1650g
Brainliest Appreciated!
how to know the unknown metal in flame test
Explanation:
The flame test is used to visually determine the identity of an unknown metal or metalloid ion based on the characteristic color the salt turns the flame of a Bunsen burner. The heat of the flame excites the electrons of the metals ions, causing them to emit visible light
How is the process of photosynthesis essential to sustaining life on Earth?
Answer:
Explanation:
Photosynthesis is important to living organisms because it is the number one source of oxygen in the atmosphere. Without photosynthesis, the carbon cycle could not occur, oxygen-requiring life would not survive and plants would die. ... The importance of photosynthesis in our life is the oxygen it produces
if a star were 36 trillion miles from the earth it would be about ___ light years from the earth
Answer:
6.12light years
Explanation:
Given parameters:
Distance of star from earth = 36 trillion miles
Unknown:
Distance in light years = ?
Solution:
A light year is the distance light travels in one year.
1 mile = 1.7 x 10⁻¹³ light years
36 trillion miles = 36 x 10¹² x 1.7 x 10⁻¹³ light years
= 6.12light years
There are several different models that represent compounds. One type of model is shown.
3 C's connected in a line by 2 black lines. The first and third C's each have 3 H's connected to them by a single black line each. The middle C has 2 H's connected to it by a single black line each.
What type of model is shown?
A) structural formula
On edge
Answer:
A
Explanation:
Which of these ions has the correct charge?
O2-
B2+
P2-
Li2+
Answer:
02- i think your welcome hope it helps
2. How can glass be a liquid if it's so hard?
Explanation:
Glass is not a liquid in the strictest sense of the word. But it is also not a standard solid. The chemistry of glass is complex and research is ongoing, but the current consensus is that glass is a phase of matter all its own, known as an "amorphous solid". Scientists refer to any amorphous solid as a "glass". Glass transitions are highly complex and cannot be treated in the same way as traditional phase transitions.
Answer:
It's a liquid state before its cooled.
I need some help with this
Which screw would create a strong hold?
A: The screw with 9 wraps.
B: The screw with 2 wraps.
C: The screw with 10 wraps.
D: The screw with 6 wraps.
Answer:
The screw with 10 wraps is the correct answer
Explanation:
The screw with 6 wraps would create a strong hold.
What do you mean by screw?The strongest member of the family of wood screws is a lag screw. It is a reliable and sturdy fastener that frequently has a square head or an externally powered hex drive.
In general, lag screws are significantly stronger and heavier than standard wood screws. They have a tapered point and coarse threads.
Thus, The screw with 6 wraps would create a strong hold.
To learn more about Screw, refer to the below link:
https://brainly.com/question/24168324
# SPJ5
please help I need to ace this test
When two atoms attach to each other by sharing electrons it is called a...
A: Covalent bond
B: Ionic bond
C: none of these - atoms can't bond to each other.
D: Nuclear bond
2nd question
Two hydrogen atoms bonded together form a compound
A: True
B: False
3rd question
Water is two hydrogen atoms bonded to an oxygen atom. This is an example of a compound
A: True
B: False
like I said I need help on this and I don't wanna fail
#1: A covalent bond
#2 False
#3True
You are doing math homework and get frustrated and throw the 7 kg book with a force of 47
Newtons. How much acceleration will the book have when you throw it?
Answer:
The answer is 6.71 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{47}{7} \\ = 6.714285...[/tex]
We have the final answer as
6.71 m/s²Hope this helps you
Balance the equation Mg+CO2 - - - - - -) MgO+c
Answer:
2Mg (s) + CO₂ (g) → 2MgO (s) + C (s)
General Formulas and Concepts:
Chemistry - Reactions
Reaction PredictionBalancing RxN'sExplanation:
Step 1: Define RxN
Mg (s) + CO₂ (g) → MgO (s) + C (s)
Step 2: Balance RxN
2Mg (s) + CO₂ (g) → 2MgO (s) + C (s)
We need to balance the number of O's on both sidesIf we balance the O's, we will also need to balance the Mg's(02.05 LC)
Which type of heat transfer takes place when objects touch each other? (3 points)
A Conduction
B Convection
C Radiation
D Temperature
Answer: That is Conduction
Explanation:
:)
Conduction
reason: Conduction is the transfer of heat through contact between items.
(Brainliest, please?)
What’s the answer????
Answer:
Greater
Greater
Explanation:
The amplitude of a wave is the height of the wave or the vertical displacement of the wave motion. We determine a wave amplitude usually by looking at the graph of the wave.
Amplitude is directly proportional to the energy of a wave. The higher the amplitude of a wave, the more its energy.
Frequency is the number of waves that passes a point at a particular instance of time. It is also directly proportional to the energy carried by a wave. The higher the frequency of a wave, the greater its energy.
Use your answers from questions 1–3 as the basis for the first section of your lab report. This section provides your reader with background information about why you conducted this experiment and how it was completed. Outline the steps of the procedure in full sentences. It also provides potential answers (your hypothesis/es) relative to what you expected the experiment to demonstrate. This section should be 1–3 paragraphs in length.
Answer:
1-state what the lab is about, that is, what scientific concept (theory, principle, procedure, etc.) you are supposed to be learning about by doing the lab. You should do this briefly, in a sentence or two. If you are having trouble writing the opening sentence of the report, you can try something like: "This laboratory experiment focuses on X…"; "This lab is designed to help students learn about, observe, or investigate, X…." Or begin with a definition of the scientific concept: "X is a theory that…." 2-give the necessary background for the scientific concept by telling what you know about it (the main references you can use are the lab manual, the textbook, lecture notes, and other sources recommended by the lab manual or lab instructor; in more advanced labs you may also be expected to cite the findings of previous scientific studies related to the lab). In relatively simple labs you can do this in a paragraph following the initial statement of the learning context. But in more complex labs, the background may require more paragraphs.
Explanation:
Answer: the correct answer is A
Explanation:
As the frequency decreases the wavelength...
Answer:
Increase
Explanation:
Assuming a sinusoidal wave moving at a fixed wave speed, wavelength is inversely proportional to frequency of the wave: waves with higher frequencies have shorter wavelengths, and lower frequencies have longer wavelengths.
The most abundant element in the universe
(1) Hydrogen
(2) Oxygen
(3) Nitrogen
(4) Helium
Answer:
Hydrogen
Explanation:
Hydrogen is universe's most simple element, which is most likely why it is the most abundant.
A neutral atom contains 12 neutrons and 11 electrons. The number of protons in this atom is
(1) 1 (3) 12
(2) 11 (4) 23
Answer:
1
Explanation:
What product(s) are formed during this chemical reaction? (Will be two answers)
B(NO3)3 + KBr rightwards arrow
K(Br)3
KNO3
Br3(NO3)2
K3NO4
B(NO3)K
B3K3
BBr3
BK
Answer:
BK. BK. BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK
To soften cloths in the wash it is recommended to use 2.0 g of sodium borate per liter of water. If a filled washing machine holds 10 L of water and the correct amount of sodium borate per liter is added, what is the concentration in percent mass/volume of the solution?
% m/v of the solution = 0.2%m/v
Further explanation[tex]\tt Percent~m/v=\dfrac{mass~solute(g)}{volume~solution(ml)}\times 100\%[/tex]
or
% m/v = g solute / 100 ml solution
Concentration : 2 g sodium borate / L water
For 10 L⇒20 g Sodium borate
[tex]\tt \%m/v=\dfrac{20~g}{10,000~ml}\times 100\%\\\\\%m/v=0.2\%[/tex]
The rate of a chemical reaction would be decreased by
Answer:
The tempreature???
Explanation:
Colder tempreatures lead to a slower chemical reaction and warmer tempreatures lead to a faster chemical reaction.
Identify a metal from the following
(1) Sulphur
(2) Boron
(3) Silicon
(4) Sodium
Answer:
sodium
Explanation:
it is an alkali metal
We can change the substance chemically by
freezing it.
True or false
what is the element for I am a metal and I have 6 Neutrons. PLEASE ANSWER TO MY QUESTION QUICKLY!!!!
Answer:
carbon-12
Explanation:
carbon 6/12 isotope has 6 neutrones and it is considered as a metal.