Answer:
These are the answers for the Atomic Number Quick Check
Explanation:
1. An element is highly conductive, highly reactive, soft, and lustrous. The element most likely belongs to which group?: alkali metals
2. How does mercury differ from other metals?: It is not solid under normal conditions.
3. Based on patterns in the periodic table, which element is the least malleable in its solid state?: phosphorus (P)
4. In which group of elements does tellurium (Te) belong?: metalloids
5. Which statement describes the properties of lanthanoids and actinoids?: They are malleable and lustrous, and they tend to conduct both electricity and thermal energy.
Hope this helps :)
Based on patterns of the periodic table, the chemical element which is the least malleable in its solid state is: D. Phosphorus (P).
A periodic table refers to an organized tabular arrangement of all the chemical elements, typically arranged in order of increasing atomic number or number of protons (in rows).
Phosphorus is denoted by the chemical symbol P and it is a chemical element with an atomic number of fifteen (15) and as such it is found in group five (5) of the periodic table.
Malleability is one of the chemical properties of a chemical element and it is simply a measure of it softness such as when hammered.
According to trends (patterns) of the periodic table, Phosphorus (P) is the chemical element which is the least malleable in its solid state.
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La densidad de aluminio es 2.7 g/cm3, calcula el volumen si su masa es de 300g
Ayuda please!!!!
d = m / V
Density = mass / volume
d (Density aluminio) = 2.7 g/cm³
m (mass) = 300 g
V (volume) = ?
[tex]volume = \frac{mass}{density} \\ \\ \\ v = \frac{m}{d} = \frac{300 \: g}{2.7 \: g/ {cm}^{3} } = 111.1 \: {cm}^{3} [/tex]
I hope I helped you^_^
A radioactive sample is placed in a closed container. Two days later only one-quarter of the sample is still radioactive. What is the half-life of this sample?
Answer:
2
Explanation:
The sample has halved twice.
1/2 of 1/2 is 1/4, and 1/2 of 1 is 1/2.
11) Calcium Chloride, CaCl2, can be used instead of road salt to melt the ice on roads during the winter. To determine how much calcium chloride had been used on a nearby road, a student took a sample of slush to analyze. The sample had a mass of 23.47g. When the solution was evaporated, the residue had a mass of 4.58g (assume that no other solutes were present).
a) What was the mass/mass percent of calcium chloride in the slush
b) How many grams of calcium chloride were present in 100g solution?
Answer:
What is that? I do not understand
different between a bird and a rat
Explanation:
Rats and mice are both rodents, so look similar - the biggest difference is their size. Rats are larger and heavier while mice have smaller slender bodies. Mice also have long slender tails (for their body size) covered in hair compared to rat tails which are shorter, thicker and hairless
This type of evidence is testimonial evidence. Statements that are made under oath
A. Trace Evidence
B. Indirect Evidence
C. Direct Evidence
D. Physical Evidence
Answer:
B
You are only trained as a Fry man kitchen helper in your restaurant. One day, one of the trained kitchen helpers assigned to the sauté station was absent. The Executive chef immediately assigned you to the sauté station by force.
What will you do considering that you have no training in that station?
What is the process of using one or more of your five senses to measure or collect data?
A.a conclusion
B.an observation
C.the scientific method
D.an inquiry
Answer:
B no observation pls mark me branilest
Is this right:) please tell me
Answer:
I think that:
The tendency of an object to resist changes in motion: inertia
Attractive force:gravity
And everything else is right
Explanation:
I am not a physicist
But I passed physics with an A
The starting material is a benzene ring with a hydroxy group on carbon 1 and an N H 2 on carbon 4. This reacts with one equivalent of acetic anhydride, which is an oxygen flanked by two carbonyls, each bonded to a methyl group.
The final product of the reaction is 4-amino-3-hydroxy-1-acetylbenzene, also known as N-acetylanthranilic acid.
What is catalyst?A catalyst is a substance that accelerates or reduces the temperature or pressure required to initiate a chemical reaction without being consumed in the process.
The Friedel-Crafts acylation reaction occurs when benzene reacts with acetic anhydride in the presence of an acid catalyst.
The acid catalyst activates the acetic anhydride to form an acylium ion intermediate in this reaction. This intermediate reacts with the benzene ring, giving it an acetyl group.
On carbon 1, there is a hydroxy group, and on carbon 4, there is an NH2 group.
Both of these functional groups are activating groups, which means they donate electrons to the benzene ring and increase its reactivity to electrophilic aromatic substitution reactions like Friedel-Crafts acylation.
Acetic anhydride adds an acetyl group to the benzene ring in a regioselective manner, which means it only adds to one position on the ring.
Thus, in this case, it adds to carbon 1, which is more reactive than carbon 4 due to the presence of the hydroxy group.
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A student in a lab holds an iron nail over an open flame, and no reaction occurs. The nail is then filed, creating small pieces of iron shavings. These pieces burn brightly when placed over an open flame.
Which statement accurately identifies one of the changes that occurs as a physical or chemical change?
A. Filing the nail is a chemical change because the composition of the material does not change but the general appearance of the iron does change.
B. Burning the iron filings is a chemical change because the composition of the material does not change but the general appearance of the iron does change.
C. Filing the nail is a physical change because the composition of the material does not change but the general appearance of the iron does change.
D. Burning the iron filings is a physical change because the composition of the material does not change but the general appearance of the iron does change.
Answer:
A - Filing the nail is a physical change because the composition of the material does not change but the general appearance of the iron does change.
Explanation
yeah its just the right answer
The following statement accurately identifies one of the changes that occurs as a physical or chemical change; "Filing the nail is a physical change because the composition of the material does not change but the general appearance of the iron does change."
The most important aspect of chemical change is that the composition of a substance changes when the substance undergoes a chemical change. This is not the case when the substance undergoes a physical change.
After a physical change, the form, size or appearance may change but never in composition.
Hence the appropriate answer is; "Filing the nail is a physical change because the composition of the material does not change but the general appearance of the iron does change."
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PLS HELP Quick!!!!!!!!!
Answer:
Bailee is incorrect. The mass of objects stay the same but the weight will change.
Explanation:
Mass is how much space something takes up, so that wouldn't change on the moon. The weight however would change because the gravitational pull on the earth is different from that on the moon.
I hope this helps!
Bailee explained that when traveling to the moon. The statement of Bailee is incorrect. The mass of the objects stays the same, but the weight will change. The correct option is B.
What is gravity?Gravity is a force that pulls all objects towards itself. It is present on the earth and in the galaxy. Gravity is the cause of all planets, and the sun and the moon stay in their own places.
The weight of items on the moon is equal to their weight on Earth, according to Bailee, thus he needs only bring a small amount of luggage. The mass is the quantity of matter. The mass never changes, only the weight changes of an object when they are on different planets.
Thus, the correct option is B. The mass of the objects stays the same, but the weight will change.
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Isotopes have
Question 3 options:
A)
a different number of neutrons in their nuclei.
B)
a different number of protons in their nuclei.
C)
a different number of electrons.
D)
different numbers of both protons and neutrons in their nuclei.
Answer:
a different number of neutrons in their nuclei.
Explanation:
The unknown metal ion gave a yellow/orange flame test and no precipitate with ammonium carbonate. What is the unknown metal?
Answer:
Sodium
Explanation:
answer right pleases
Unit of electro negativity
Answer:
There are no units with electro negativity. Linus Pauling designed a scale of electro negativity that ranks elements with respect to each other. So, for example, fluorine is a 4.0 in comparison to 0.7 for francium.
Explanation:
Pls help 10 points
Plsplsplspslspslspslsspsls
A student was given an unknown metal. The student determined that the mass of the metal was 30.2g. The student placed. The metal in a graduated cylinder filled 20.0 mL of water. The metal increased the volume of water to 22.9mL. Calculate the density of the metal and determine the identity of the metal using the table below.
Write short Note On Valence shell
Answer:
The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.
Explanation:
brainliest is appreciated
Please help me thank you
Explanation:
increases then decreases
How will a decrease in the concentration of a reactant affect a chemical reaction?
Answer:
When the concentrations of the reactants are raised, the reaction proceeds more quickly. ... When solids and liquids react, increasing the surface area of the solid will increase the reaction rate. A decrease in particle size causes an increase in the .
Answer!! 50 points
Which statement describes the properties of lanthanoids and actinoids?(1 point)
A. They are malleable and lustrous, and they tend to conduct both electricity and thermal energy.
B. They are brittle and dull, and they tend to conduct both electricity and thermal energy.
C. They are brittle and dull, and they tend to be poor conductors of both electricity and thermal energy.
D. They are malleable and lustrous, and they tend to be poor conductors of both electricity and thermal energy.
Answer:
a i j took test and c was wrong
Explanation:
Answer:
the answer is a. c is wrong
Explanation:
What is the identity of the element? Help please
Answer:
10
Explanation:
The identity of an element refers to the specific element that is being referred to. The identity of the element is phosphorus (P).
To determine the identity of the element based on the given idealized PES (Photoelectron Spectroscopy) spectrum, we need to examine the pattern of relative number of electrons vs. energy levels.
The PES spectrum shows the relative number of electrons at different energy levels, and it is usually plotted with the relative number of electrons on the y-axis and the energy levels on the x-axis.
From the given data, we can see that there are three peaks with the following approximate values:
Energy (MJ/mol): ~1000, Relative number of electrons: ~1000
Energy (MJ/mol): ~100, Relative number of electrons: ~100
Energy (MJ/mol): ~10, Relative number of electrons: ~10
Based on this information, we can infer that the element has three distinct electron energy levels or subshells with approximately 1000, 100, and 10 electrons each.
To identify the element, we need to consider the electron configuration of elements in the periodic table and find an element that has three energy levels or subshells with roughly the same number of electrons.
The element that matches this pattern is phosphorus (P), which has the electron configuration: 1s² 2s² 2p⁶ 3s² 3p³. This configuration has 2 electrons in the 1st energy level (1s²), 8 electrons in the 2nd energy level (2s² 2p⁶), and 5 electrons in the 3rd energy level (3s² 3p³). The numbers are not exact matches, but they are relatively close to the given values in the PES spectrum.
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2. Based on the following balanced equation:
2 NH3 + 202 N2O + 3 H2O
a. How many moles of O2 are required to react completely with 3.00 moles of NH3?
1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00
b. How many moles of H20 are produced after complete reaction of 3.00 moles of NH3?
1.00
1.50 2.00 2.50 3.00
3.50 4.00 4.50 5.00
c. How many moles of N O are produced after complete reaction of 3.00 moles of NH3?
1.00 1.50 2.00 2.50 3.00
3.50
4.00 4.50 500
To do this, just take the given miles and multiply it with the ratio of molecules in the chemical equation to get your answer.
Which of the following is more soluble in water, methanol (CH3OH), or CH2I2(l).
Answer:
CH3OH
Explanation:
has hydroxide ions
Solubility has been the property of the substance to get dissolved to form the solution. Methanol (CH₃OH) is more soluble in water than Diiodomethane (CH₂I₂).
What is solubility?Solubility is best defined as the capability of the substance to get dissolved or dissociated into a solvent for the formation of the solution at a given temperature. The solubility of the various substances varies and is an important part of the mixture and solution.
Solubility in water has been the measure of the solute to get dissolved in water. The pressure and the temperature of the system directly affect the solubility of any substance in a solvent. Water is a polar molecule with hydrogen bonds in a great solvent that dissolves almost all the molecules like salt, sugar, etc.
Methanol is soluble in water as it contains hydrogen bonds as the intermolecular forces that interact with the polar water molecule by the virtue of the hydroxide and the hydrogen ions that show the molecular attraction and allows the molecule to get dissolved.
Therefore, methanol is soluble in water.
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Write the molecular formula of ferric oxide and calcium hydroxide by criss-cross method
[tex]\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\put(0,3){\bf Fe}\put(0,0){\bf -3}\put(4,3){\sf O}\put(4,0){\bf -2}\put(0.2,2.9){\vector(4,-3){3.5}}\put(3.8,2.9){\vector(-4,-3){3.5}}\end{picture}[/tex]
[tex]\\ \sf\longmapsto Fe_2O_3[/tex]
Calcium Hydroxide:-[tex]\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\put(0,3){\bf Ca}\put(0,0){\bf 2}\put(4,3){\sf OH}\put(4,0){\bf -1}\put(0.2,2.9){\vector(4,-3){3.5}}\put(3.8,2.9){\vector(-4,-3){3.5}}\end{picture}[/tex]
[tex]\\ \sf\longmapsto Ca(OH)_2[/tex]
Note:-
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In the adjoining figure, the circles with the + sign represent protons and the empty circles represent neutrons. Determine which atoms in the figure are isotopes of each other.
Answer:
2 and 3 explanation in the comments
What is the reducing agent in the redox reaction represented by the following cell notation?
Zn(s) ∣ Zn2+(aq) ∣∣ Ag+(aq) ∣ Ag(s)
To solve such this we must know the concept of redox reaction. Therefore, Zn is the reducing agent represented by the given cell notation
Zn(s) ∣ Zn2+(aq) ∣∣ Ag+(aq) ∣ Ag(s)
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Redox reaction is a chemical reaction where oxidation and reduction takes place simultaneously. Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant. Zn is the reducing agent in the given reaction. The component that undergoes oxidation is known as a reducing agent.
Therefore, Zn is the reducing agent in the given reaction.
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What are the labels for the element Pb?
Answer:
Lead is a chemical element with symbol Pb and atomic number 82.
What is the main difference between dew and clouds?
Answer:
dew is wet and clouds are not
Explanation:
Dieldrin is a pesticide that is effective in killing?
Answer:
fddoiiijjjjjjjhhggggrrddffgghuuiii
Please help me answer that question.
Answer:
(I)
[tex] = (1 + 35.5) \\ = 36.5[/tex]
(II)
[tex] = \{1 + 14 +(16 \times 3) \} \\ = 63[/tex]
(III)
[tex] = \{(2 \times 39) + 12 + (16 \times 3) \} \\ = 138[/tex]
(IV)
[tex] = 23 + 16 + 1 \\ = 40[/tex]