The average atomic mass of Ca : 43.943 amu
Further explanationGiven
Isotopes of Ca
Required
The average atomic mass
Solution
Isotopes are elements that have the same Atomic Number (Proton)
Atomic mass is the average atomic mass of all its isotopes
Avg atomic mass = m1.%m1 + m2.%m2....mn.%mn
m1 = isotope 1
m2 = isotope 2
% = abundance of the elements in nature
Input the value :
avg atomic mass = 39.96 x 0.96941 + 41.96 x 0.0647+42.96 x 0.0135 + 43.96 x 0.02086 + 47.95 x 0.0187
avg atomic mass =43.943 amu
To be effective, a certain drug must not drop below 15 mg in the body. A 120
mgs of that drug was administered to a patient. How much time will it take for
that drug to reach the 15 mg minimum level. The drug's half-life is 30 minutes.
Help me (number 5).
Answer:
a. HF
Explanation:
6/14and3/7 answer 6/11and9/16answer 5:6=10:12answer
your question was incomplete.............. you haven't mentioned any required information
What would Thomson's model and Rutherford's model of the atom have in common?
Answer:
Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup." Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom.
Explanation:
Answer:
From another website, “Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup." Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom.”
Explanation:
Please help
If you know Spanish I’ll mark mark you as brainlister
section 5:
1. D
2.E
3.F
4.A
5. C
6. B
Answer:
5 Match each picture with a correct word or expression
1. el premio d.
2. la vuelta a Francia e.
3. los juegos Olímpicos f.
4. soy musculoso a.
5. hacemos ejercicio c.
6. metimos un gol b.
6 Translate the following sentences into spanish:
1. I like watching the olympic games
Me gusta ver los juegos Olímpicos
2. the pan American games are a very important competition
Los juegos Panamericanos son una competición muy importante
3. to stay fit it is good to follow a well balanced diet
Para mantenerse en forma es bueno seguir una dieta sana y equilibrada
4. to score a goal it is necessary to play on a team
Para marcar un gol es necesario jugar en equipo
5. The tour de France is the most famous cycling competition in the world
El Tour de Francia es la competición de ciclismo más famosa del mundo.
6. the world cup is the most popular sporting event in the world
La copa del mundo es el evento deportivo más popular del mundo
I highly recommend to read this carefully.
10 While a student is holding a piece of metal in her hand, her hand gets colder. What happens to the temperature of the metal? * m (6 Points) A. The piece of metal will get warmer because some thermal energy is transferred from the metal to the student's hand. B. The piece of metal will get warmer because some thermal energy is transferred from the student's hand to the ON metal. C. The piece of metal will stay at the same temperature because an equal amount of thermal energy is exchanged between the student's hand and the metal. D. The piece of metal will stay at the same temperature because thermal energy is not transferred between the student's hand and the metal.
Answer:
B
Explanation:
thermal energy is the energy between one object to another
How much energy is required to melt 2 kg of copper? Use the table below and
this equation: Q = mLfusion
A. 125.6 kJ
B. 9460 kJ
C. 414 kJ
D. 4730 kJ
Answer:
C. 414 kJ
Explanation:
Given parameters:
Mass of copper = 2kg
Unknown:
Amount of energy required to melt the copper = ?
Solution:
To solve this problem, we use:
Q = m L
m is the mass
L is the latent heat of fusion of copper = 207kJ/kg
So;
Q = 2 x 207 = 414kJ
A student claims that a large percentage of water on Earth is immediately available to drink. Is he correct? Why or why not?
Answer:
No, the student is not correct. The earth may have a lot of water... but not every part of water is drinkable. Most water is filled with bacteria and or viruses making it not suitable to drink! :)
Explanation:
HOPE THIS HELPS! BRAINLIEST? :)
Which of the above electron dot structures is wrong?
Be
B
Al
H
Ne
Answer:
Al
Explanation:
Aluminum (Al) is in the same group as Boron (B) so it should have three electrons or dots around it.
Hope that helps.
Answer:
Structre of Al is wrong
Means Al is right answer of the above question
Explanation:
Because valence shell of aluminum contains three electron not 5 elctrons
Correct structure of Al is given
What element of the compound caused the colors of the flames
Answer:
Flame colors are produced from the movement of the electrons in the metal ions present in the compounds. For example, a sodium ion in an unexcited state has the electron configuration [tex]1s^{2} 2s^{2} 2p^{6}[/tex].
Explanation:
Explain, in your own words, what volumic mass is
plss helpp
Answer:
I think that volumic mass is like weight of an object, or like the space it takes up??
Explanation:
Have A Wonderful Day !!
Which element probably reacts most like bromine, Br?
A) Oxygen, O
B) Selenium, Se
C) Krypton, Kr
D) Chlorine, Cl
Answer:
D) Chlorine, Cl
How many atoms of each element in the compound 2(PO4)
Answer:
8 & 13
Explanation:
After what part of the cell cyle does the cell begin interphase?
A.anaphase
B.prophase
C.cytokinesis
Explanation:
The prefix inter- means between, reflecting that interphase takes place between one mitotic (M) phase and the next. Image of the cell cycle. Interphase is composed of the G1 phase (cell growth), followed by the S phase (DNA synthesis), followed by the G2 phase (cell growth).
4.
Think and discuss: Why is there an attraction between the two ions in this chemical bond?
Answer:
These ions are attracted to each other due to its opposite charges. This force of attraction is called an ionic bond because it is formed by the attraction of two atoms with opposite charges.
Explanation:
LOL im answering this question for a gizmo assingment rn
There is an attraction between two ions in a bond because they are composed of opposite charges.
In science, we know that opposite charges attract while like charges repel according to the first law of electrostatics. Ionic bonds are composed of metal and non metal ions. The metal ions are positively charged while the nonmetal ions are negatively charged.
These oppositely charged ion pair constitute the ionic bond therefore, there an attraction between the two ions in this chemical bond because they are unlike charges.
Learn more: https://brainly.com/question/2673886
WHAT TWO PLANT CELLS DONT PRODUCE PROTINES?!?!?!?!?
I was too afraid we wouldn't be let in if l corrected the man's pronunciation, but I said our name to myself, opening my mouth wide for the organ blast of the a, trilling my tongue for the drumroll of the r, All-vah-rrr-es! How could anyone get Elbures out of that orchestra of sound?
Which influence does Alvarez write about in this passage?
her family
her neighbors
her family’s heritage
her personal experience
Answer:
D. Her Personal experience.
Did Adam Jackson win by
Answer:
by a number
Explanation:
Answer:
Hm may you edit the question and put in the full question all it says is "Did Adam Jackson win by"
Explanation:
.
How many elements are solid at freezing?
What is Johann Dobereiner's contribution to the development of the periodic table?
What does the GOES acronym stand for?
A. Geological Open Engineering System
B. Geostationary Opertational Environmental Satellite
C. Grandma Only Eats Spagetti
Answer:
B. Geostationary Operational Environmental Satellite
Explanation:
Hope this helps!
Answer:
B
Explanation:
I’m studying it for you!
The force applied to a pulley is called
Answer:
the effort
Explanation:
:)
I need done within 2 hours. Thanks alot.
Answer:
Independent Variable:The size of the ice cube Dependent:The temperatureof the water controlled:the amount of water
Place a thermometer in the water, put the ice cube in then when it melts =see the ending temperature
Explanation:
What happened when we made the predator(snake) population larger?
Sentence starter: The rabbit (prey) population...
Answer:
The rabbit prey population will decrease.
Explanation:
More predators are there to eat the prey
Can compounds be broken down into the elements they are made of?
Answer:
yes, some can
Explanation:
because like salt an other compounds by being decomposed
An irregularly shaped stone was lowered into a graduated cylinder holding a volume of water equal to 2.0 mL. The height of the water rose to 7.0 mL. If the mass of the stone was 25 g, what was its density?
Answer:
Density = 5 g/mL
Explanation:
Given data:
Volume of water = 2.0 mL
Volume of water + stone = 7.0 mL
Mass of stone = 25 g
Density of stone = ?
Solution:
Volume of stone = (volume of water + stone) - volume of water
Volume of stone = 7.0 mL - 2.0 mL
Volume of stone = 5.0 mL
Density of stone = mass/ volume
Density = 25 g/ 5.0 mL
Density = 5 g/mL
Laura has three beakers. Each contains 200 cm3 of a colourless liquid. Suggest how Laura could nd out which beakers contain pure water, and which contain solutions.
Answer:
See explanation
Explanation:
A pure liquid has a sharp boiling point. Now we know that the boiling point of water is 100°C.
If Laura begins to heat each liquid with a thermometer inserted into each liquid, the liquid that boils at exactly 100°C is pure water while the rest are solutions.
A potted plant is placed under a grow lamp, which provides 4,200 J of energy to the plant and the soil over the course of an hour. The specific heat capacity of the soil is about 0.84 J/g° C and there are about 2,400 g of soil. How much does the temperature of the soil increase?
Answer:
Temperature increase = ΔT = 2.08 °C
Explanation:
Given data:
Energy absorbed by plant = 4200 J
Specific heat capacity of soil = 0.84 J/g°C
Mass of soil = 2400 g
How much temperature increase = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
by putting values,
4200 J = 2400 g ×0.84 J/g°C × ΔT
4200 J = 2016 J/°C × ΔT
ΔT = 4200 J / 2016 J/°C
ΔT = 2.08 °C
Mg(s) + HCl(aq) −→ MgCl2(aq) + H2(g).
What mass of HCl is consumed by the reaction of 2.28 mol of magnesium?
Answer in units of g
166 g HCl
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
BracketsParenthesisExponentsMultiplicationDivisionAdditionSubtractionLeft to RightChemistry
Stoichiometry
Reading a Periodic TableBalancing EquationsUsing Dimensional AnalysisExplanation:Step 1: Define
[RxN - Unbalanced] Mg (s) + HCl (aq) → MgCl₂ (aq) + H₂ (g)
[RxN - Balanced] Mg (s) + 2HCl (aq) → MgCl₂ (aq) + H₂ (g)
[Given] 2.28 mol Mg (s)
Step 2: Identify Conversions
[RxN] 1 mol Mg = 2 mol HCl
Molar Mass of H - 1.01 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of HCl - 1.01 + 35.45 = 36.46 g/mol
Step 3: Stoichiometry
Set up: [tex]\displaystyle 2.28 \ mol \ Mg(\frac{2 \ mol \ HCl}{1 \ mol \ Mg})(\frac{36.46 \ g \ HCl}{1 \ mol \ HCl})[/tex]Multiply: [tex]\displaystyle 166.258 \ g \ HCl[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
166.258 g HCl ≈ 166 g HCl
Part 1
Observe the image of sodium. List the properties you see.
Part 2
Observe the image of hydrogen chloride. List the properties you see.
Answer:
Observable properties of sodium from the image:
1. It's slivery-white solid
2. It's shiny and bright
3. Looks soft
4. Looks waxy
Observable properties of hydrogen chloride from the image:
1. It is a colorless liquid
2. It is transparent
Explanation:
Sodium is known to be a metal that is silvery-white and waxy in appearance. The metal is bright and shiny especially when it is cut. It can be cut with a knife due to it soft nature. It is reactive and has low melting point. It actually reacts with water to form sodium hydroxide.
Hydrogen chloride (known to be hydrochloric acid) is a transparent and colorless substance. It is used in manufacturing plastics, textile, fertilizers, etc. The concentrated hydrogen chloride is very corrosive.
The above are what I can see from the image.