Answer:
well ,if I have done my sum rights there are
14 atom in the one formula unit of aluminium carbonate.
Answer:
14 atoms
Explanation:
13. Adding up all of the
of all of the individual atoms within one molecule of a compound will determine the molecular mass of the compound.
A. atomic numbers
B. electrons
C. atomic masses
D. protons
What substance is neither an acid nor a base? How does it stay neutral? HURRY PLS
Answer:
21. Most metals are brittle.
22. increases from top to bottom within the group
23. Neon is the most stable element because its highest occupied energy level is filled.
24. transfer of electrons
25. electrons are not shared equally between atoms
26. BeCl2
27. double-replacement and decomposition
28. exothermic
29. The reaction rate decreases.
30. The salt dissolved most quickly in the warm water.
31. saturated
32. feels slippery
33. hydroxide ions in solution
34. stay about the same
35-40. I do not know.
41. a bee hovering around a bee hive
42. the number of valence electrons in atoms of the element
Explanation:
21. Metals are ductile and malleable (conveniently also characteristics for chewing gum). They are stretchy and squishy. Brittle is the opposite of stretchy and squishy, and is a characteristic of non-metals.
22. On the periodic table, elements higher up are safer to use in labs. They are safer because they are less likely to react with other substances. Therefore the tendency to react with other substances increases from top to bottom within the group.
23. "Noble gases stable" (periodic table song by ASAP Science). Neon is a noble gas, therefore it is stable. When elements have only one electron to gain or lose, they are very reactive or least stable.
24. The formation of an ionic bond (metal + non-metal) is caused by the giving and receiving of electrons. Neutrons and protons do not transfer. Electrons are shared in covalent/molecular bonds (between non-metals).
25. A polar covalent bond occurs between non-metals, therefore they share electrons (ionic bonds transfer electrons). Non-metals become anions (whereas metals become cations). Polar bonds have unequal sharing and nonpolar bonds have equal sharing.
26. A one-to-two ratio of beryllium ions to chloride ions means for every Be, there are two Cl. The number of atoms is represented by the ratio, and the numbers of atoms are written as subscripts after the element symbol.
27. MgCO2 reacting with HNO3 to form magnesium nitrate and carbonic acid is a double-replacement reaction. The elements in the beginning substances "switch partners" to form the products.
Carbonic acid then breaks down into water and carbon dioxide is decomposition. This occurs when the elements that make up a compound are split up.
28. In 2Cu + O2 => 2CuO + 315 kJ , the energy is on the right side. The right side is the products, or the stuff that was made. kJ is a unit to measure energy, therefore energy was made. Exothermic is the term that means energy was released.
29. Since oxygen is needed for a fire to burn, decreasing the oxygen slows the reaction rate (the reaction is burning, formally known as combustion).
30. Two things help substances dissolve: heat and stirring. Warm water is hotter than room-temperature water and ice water. This makes the salt dissolve faster.
31. A solution that contains more solute than it would normally hold is saturated. Saturated means there is a more than concentrated amount of solute in the solution. Concentrated is when there is a maximum amount of solute that will dissolve.
32. Acids do not feel slippery -- that is a characteristic of a base. To remember, bases are generally soaps and soaps are slippery. Acids taste sour and bases taste bitter. Both acids and bases change the color of an indicator .
33. A base produces hydroxide ions, represented by OH. The OH is usually at the end of the chemical formula. Acids produce hydrogen ions, generally written at the front of the chemical formula.
34. Adding a little bit of acid to a buffer will cause the pH of the solution to stay about the same, probably increase a little. Buffer solutions are meant to make the pH "buffer". To remember, DVDs used to buffer. It's the same thing as "lag" for phones.
35-40: I'm sorry, I have no answer.
41. Electrons orbit like the plants revolve around the sun. Electrons revolve around a nucleus. A bee hovering around a bee hive is probably flying around it in circles.
42. The tendency of an element to react is closely related to the number of valence electrons in atoms of the element. If the valency is 8, the electron shell is full. The element is stable, opposite to reactive -- this applies to all noble gases (group 8A on the periodic table). If the valency is 1 or 7, the element is very close to being stable but not, the "desire" is so great and makes the element very reactive.
What is another name for Group 6A? O A. Group A6 O B. Group 6B O C. Group 16 D. Group 6
Answer: group 16
Explanation: apex
Which process results in two identical cells?
O meiosis
O replication
O fertilization
O mitosis
May u please help i mark brainlist ! :D
Answer:
fertilization i think
Explanation:
because during fertilization process two identicle cell divisions takes place
Answer:
fertilization
Explanation:
edgenuity
3. Burns from boiling water can be severe, caused by the transfer of energy from the boiling water to the
skin as the water cools to body temperature. How much heat (kJ) is transferred from the from 15.0g
of boiling water at 100.0°C as it hits the skin and cools to 37.2°C?
Answer:
Q = 3937.56 J
Explanation:
Heat transferred due to change in temperature is given by :
[tex]Q=mc\Delta T[/tex]
c is the specific heat of water, c=4.18 J/g-°C
We have, m = 15 g, [tex]T_i=100^{\circ} C\ \text{and}\ T_f=37.2^{\circ} C[/tex]
So,
[tex]Q=15\times 4.18\times (37.2-100)\\Q=-3937.56\ J[/tex]
Hence, 3937.56 J of heat is transferred.
The elements carbon, hydrogen, oxygen, and nitrogen make up which percentage of the human body?
Answer:
96% Hope it helps
Explanation:
Roughly 96% of the mass of the human body is made up of just four elements: oxygen, carbon, hydrogen and nitrogen, with a lot of that in the form of water. The remaining 4% is a sparse sampling of the periodic table of elements.
which two models would be most useful in predicting weather
Answer:mathematical and map
Explanation:
mathematical and map
Explanation:
The two forces acting on a boat or some other floating object are________
and gravity.
Answer:
buoyancy. ...
Explanation:
........
Answer:
buoyancy
Explanation:
mark as brainliest
Use the clues you highlighted to choose the best
meaning of beat in this sentence.
Highlight the context clues that help you choose
the best meaning of the word beat.
Our family beat a retreat back to the sofa as if chased by
enemy soldiers
- "The All-American Slurp."
Lensey Namioka
O defeated
O mixed
hurried
musical rhythm
Answer:
hurried
Explanation:
because they retreated back to the couch so hurried.
Answer:
c
Explanation:
what variables effect whether or not the fishing weight floats
Answer:The fishing way and how fast is going
Explanation:Because of the variables the fishing we will flow much more faster
Which statement is incorrect concerning the formation of ionic compounds?
a Halogens tend to form anions with a charge of -1.
b. Alkali metals tend to form cations with a charge of +1.
c. Metals tend to form cations, while nonmetals tend to form anions.
d. Transition metals tend to form cations with a charge of +3.
e. Noble gases tend not to form ionic compounds.
Answer:
d. Transition metals tend to form cations with a charge of +3.
Explanation:
Which statement is incorrect concerning the formation of ionic compounds?
a. Halogens tend to form anions with a charge of -1. TRUE. Halogens have 7 electrons in their valence shell, so they tend to gain 1 electron to fill their octet.
b. Alkali metals tend to form cations with a charge of +1. TRUE. Alkali metals have 1 electron in their valence shell, so they tend to lose 1 electron to fill their previous octet.
c. Metals tend to form cations, while nonmetals tend to form anions. TRUE. Metals have low electronegativity while nonmetals have high electronegativity.
d. Transition metals tend to form cations with a charge of +3. FALSE. Transition metals form cation with numerous charges.
e. Noble gases tend not to form ionic compounds. TRUE. Noble gases are very stable because their octet is full.
You have an atom with a mass number of 100 with 85 neutrons. What is this
element?
Answer:
phosphorus i believe
Explanation:
in order to find the atomic number you minus the mass number from number of neutrons then just look it up in a periodic table
The mass number of the atom is 100 and number of neutrons is 85. Then, number of protons is 15. Then, element with 15 protons and 15 electrons is phosphorous.
What is mass number ?An atom is composed of subatomic particles electrons, protons and neutrons. Protons and neutrons are located inside the nucleus. The mass number of an atom is sum of number of protons and neutrons.
The number of electrons in an atom in its neutral state is called its atomic number. In a neutral atom, the number of electrons and proton are the same.
Give the mass number = 100
no.of neutrons = 85
no.of protons = 100 -85 =15
no.of electron = 15
Thus, atomic number = 15.
The element with atomic number of 15 is phosphorous (P).
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M= 34.1g V= 78.5 mL D=?
Answer:
The answer is
0.43 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 34.1 g
volume = 78.5 mL
The density is
[tex]density = \frac{34.1}{78 .5} \\ \approx 0.434394904...[/tex]
We have the final answer as
0.43 g/mLHope this helps you
Akito is warming a test tube over a Bunsen burner. He heats it too much and the glass breaks.
Which best describes what Akito should do first?
Ο Ο Ο Ο
O get paper towels
O change lab stations
turn off the burner
remove his contacts
Answer:
c
Explanation:
Which of the following would be a good solvent choice when preparing your sample for 1H NMR?
a. CD2C12
b. СНЗОН
c. More than one of the answer choices
d. CH2C12
e. None of the answer choices
f. CD3OD
Answer:
e. None of the answer choices
Explanation:
The solvents used for 1HNMR analysis are chloroform D (CDCl3), and acetone D6 (CD3COCD3) and deuterium oxide (D2O). And here any of these three nans are listed in the given option so that we can say that none of the answers are correct. so correct answer is e. None of the answer choices
Phil has to put the greatest number of apples and oranges in each box so each box has the same number of apples and oranges. Should Phil use the greatest common factor (GCF) or the least common multiple (LCM) to solve the problem
Answer:
GCF
Explanation: Your question says "The GREATEST number of apples and oranges" Key word is "greatest".
Select the words that correctly complete the sentences. A class uses 10 students to model a lithium atom. Each student represents a particle in the atom. Three students wear signs with a “+” sign, representing (electrons / neutrons / protons). The four students with “0” signs represent (neutrons / protons / electrons ). Each of the remaining students wear a “–” sign, representing (protons / electrons / neutrons)
Answer:
Explanation:
Protons.
Electrons.
Neutrons.
I hope I helped you! :)
Why does burned toast taste so bad? Is it a chemical or physical change?
Because things that are burnt have been changed into something else like moldy bread thats cooked.
It is chemical change because you cannot unburn something.
Answer:
It's a chemical change because I'm really good at answers
Explanation:
Determine the number of mm in 14.3cm
Answer:
143 mm . covert it an determine an individual percentage .
Lead (Pb) (average atomic mass 207.19 amu) has three naturally-occurring isotopes, Pb206, Pb207and Pb208 with isotopic masses of 205.98 amu, 206.98 amu and 207.98 amu respectively. If the isotopes Pb207and Pb208 are present in equal amounts, calculate the percent abundance of each isotope of Pb, which are, Pb206, Pb207 and Pb208.
Answer:
pb am 207.19 amu
pb206, pb207and pb208
A running track measures 1056 ft per lap. To run 15.0 km, how many laps should you run?
Answer:
46.6 laps
Explanation:
Step 1: Given data
Length of the lap (l): 1056 ftTotal distance to be run (d): 15.0 kmStep 2: Convert "l" to km
We will use the conversion factor 1 km = 3280.84 ft.
1056 ft × (1 km / 3280.84 ft) = 0.3219 km
Step 3: Calculate the number of laps that you should run
We will use the following expression.
laps = d/l
laps = 15.0 km/(0.3219 km/lap)
laps = 46.6 laps
the atomic mass of the isotope copper-__ is 62.930 amu
We have that The isotope of copper with the atomic mass of the isotope copper 62.930 amu is Cu 63
Cu 63
From the question we are told
the atomic mass of the isotope copper-__ is 62.930 amu
Generally
Copper is the 29th element of the the periodic table with an atomic mass of 29.
Copper as an elementt has 2 stable isotopes which are
Cu 63
Cu 65
Therefore
The isotope of copper with the atomic mass of the isotope copper 62.930 amu is Cu 63
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A 500 gram piece of metal had a volume of 2.75cm3. What is it’s density
Answer:
181.82 g/cm3
Explanation:
density is mass / volume so it is 500 / 2.75=181.82 g/cm3
For a trip to the Moon, a rocket must lift off from
Earth's surface. Suppose it takes 5 minutes for the
rocket to reach a velocity of 6,000 m/s upward from
a starting velocity of 0 m/s. What is the rocket's
acceleration?
Answer:
20 m/s^2
Explanation:
given,
final velocity (v) = 6000m/s
initial velocity (u) = 0m/s
time taken (t) = 5 minutes
= 5×60second
= 300second
acceleration(a) = ?
we know that,
a = (v-u)/t
= (6000-0)/300
= 20 m/s^2
HELP !!
Question 5 Multiple Choice Worth 3 points)
(01.04 LC)
Which of the following is not an intensive physical property?
Magnetism
Boiling point
Thermal conductivity
Volume
It would be volume.
Volume is not an intensive property because it does change as the amount of substance increases or decreases. The rest of the properties are constant no matter the amount of substance.
Answer:
Volume
Look at the guy above me, okay-- they're smarter then me-
Which best justifies the accuracy of the claim?
Answer:
A
Explanation:
the 2nd artical is against global warming while the first one uses scientific evidence
An example of an extensive physical property is
Group of answer choices
mass
density
boiling point
melting point
Answer:
Mass and density is the answer?
Which of the following are false about Prokaryotic Transcription termination?
A. It can occur in a factor dependent fashion.
B. It can occur in a factor independent fashion.
C. It may involve Rho protein.
D. none of the above.
Answer: none of the above
Explanation:
In Prokaryotic Transcription termination, it should be noted that the RNA polymerase transcribes through a terminator sequence, which in turn results in the polymerase to be separated from the DNA and thereby leads to its release of the transcrip.
Prokaryotic Transcription termination can occur in a factor dependent fashion, can occur in a factor independent fashion and may involve Rho protein.
Therefore, none of the options is false.
6.(01.05 LC) Which states of matter change shape when moved?(2 points) Gases and solids Liquids and gases Liquids, solids, and gases Solids and liquids
Answer:Gases and solids , Solids and liquids
Explanation:
A solid has a definite shape while liquids and gases take the shape of the container in which they are found .
Hence when a substance changes it's state from gas to solid or solid to liquid, it's shape automatically changes as explained above.
how is the caloric value of a food sample determined?
A food sample's caloric value is calculated. By dividing the total weight throughout grams of a particular food by the nutritionists' calculated energy values.
What is calorie?The calorie is an amount of energy that derives from the outmoded caloric concept of heat. Two primary interpretations of "calorie" are frequently used due to historical factors.
The quantity of energy needed to elevate the temperature from one water molecule through one degree Celsius is known as a big calorie, food caloric intake, dietary calorie, simply kilogram calorie. A food sample's caloric value is calculated. By dividing the total weight throughout grams of a particular food by the nutritionists' calculated energy values.
Therefore, a food sample's caloric value is calculated. By dividing the total weight throughout grams of a particular food by the nutritionists' calculated energy values.
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