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?
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
Pls help 10 points
Plsplsplspslspslspslsspsls
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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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
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.
How do we measure the weight or mass of something
Explanation:
We can measure the weight or mass of something by using beam balance.
Which of the following is an example of a change from gravitational potential
energy to kinetic energy?
Answer:
The speed of a roller coaster increases as gravity pulls it downhill and is greatest at its lowest point. Viewed in terms of energy, the roller-coaster-Earth system's gravitational potential energy is converted to kinetic energy
Explanation:
a ball held in the air is the example of a change from gravitational potential energy to kinetic energy.
limewater turns cloudy or milk when a gas bubbled through it. what is the cause of its cloudiness?
hi <3
the cloudiness is caused by the production of carbon dioxide
hope this helps :)
Answer:
Lime water is calcium hydroxide with formula
[tex]{ \sf{Ca(OH)_2}}[/tex]
when calcium hydroxide reacts with the gas [ carbon dioxide ]
[tex]{ \sf{Ca(OH)_{2(aq)} + CO_{2(g)} → CaCO_{3(s)} + H_2O_{(l)}}}[/tex]
Calcium carbonate is white cloudy precipitate
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:
NaClO4/ HCIO4 is a buffer system
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
Please show the working for question 1 to 8
Answer:
5) C
6) D
7) D
8) C
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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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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Convert a length of 20.0m to inches
Answer:
787.401575 inches
27. What is the mass of 2.34 x 1023 atoms of Sulfur?
a) 12.5 g
b) 1.25 x 1049
g
c) 1.25 x 1047 g
Answer:
[tex]\boxed {\boxed {\sf A. \ 12.5 \ grams}}[/tex]
Explanation:
We are asked to find the mass of 2.34 × 10²³ atoms of sulfur (S)
1. Convert Atoms to MolesFirst, we convert atoms to moles using Avogadro's Number of 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. For this question, the particles are atoms of sulfur. There are 6.022 × 10²³ atoms of sulfur in 1 mole of sulfur.
We will convert using dimensional analysis, so we must set up a ratio.
[tex]\frac {6.022 \times 10^{23} \ atoms \ S}{1 \ mol \ S}[/tex]
We are converting 2.34 × 10²³ atoms of sulfur to moles, so we multiply the ratio by this value.
[tex]2.34 \times 10^{23} \ atoms \ S* \frac {6.022 \times 10^{23} \ atoms \ S}{1 \ mol \ S}[/tex]
Flip the ratio so the units of atoms of sulfur cancel.
[tex]2.34 \times 10^{23} \ atoms \ S* \frac{1 \ mol \ S} {6.022 \times 10^{23} \ atoms \ S}[/tex]
[tex]2.34 \times 10^{23}* \frac{1 \ mol \ S} {6.022 \times 10^{23}}[/tex]
[tex]\frac{2.34 \times 10^{23}} {6.022 \times 10^{23}} \ mol \ S[/tex]
[tex]0.3885752242 \ mol \ S[/tex]
2. Convert Moles to GramsNext, we convert moles to grams using the molar mass. This is the mass of 1 mole of a substance. The value is found on the Periodic Table as the atomic mass, but the units are grams per mole instead of atomic mass units. Look up sulfur's molar mass.
S: 32.07 g/molSet up another ratio.
[tex]\frac {32.07 \ g \ S}{ 1\ mol \ S}[/tex]
Multiply by the number of moles we calculated.
[tex]0.3885752242 \ mol \ S *\frac {32.07 \ g \ S}{ 1\ mol \ S}[/tex]
The units of moles of sulfur cancel.
[tex]0.3885752242 *\frac {32.07 \ g \ S}{ 1}[/tex]
[tex]0.3885752242 * {32.07 \ g \ S}[/tex]
[tex]12.46160744 \ g \ S[/tex]
3. RoundThe original value of atoms (2.34 × 10²³) has 3 significant figures (2,3, 4), so our answer must have the same. For the number we calculated, that is the tenths place. The 6 in the hundredth place tells us to round the 4 up to a 5.
[tex]12.5 \ g \ S[/tex]
There are 12.5 grams of sulfur in 2.34 × 10²³ atoms of sulfur.
How did you figure out the number of electrons in each atom?
Answer:
The atomic number of an atom [ number of protons ] is the number of electrons of an atom.
[tex].[/tex]
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:
What are the labels for the element Pb?
Answer:
Lead is a chemical element with symbol Pb and atomic number 82.
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:
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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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Determine the empirical formula of the compound formed when 1.2g of magnesium reacts with 3.55g of chlorine.Take the molar mass of magnesium and chlorine to be 24g and 35.5g respectively.
Explanation:
For Mg, (1.2 g Mg/24 g Mg) = 0.05 mol Mg.
For Cl, (3.55 g Cl/35.5 g Cl) = 0.1 mol Cl
So the ratio now is
Mg:Cl = 0.05 : 0.1 = 1:2
I got the 1:2 ratio by dividing both by the smallest number, which is 0.05 mol. Therefore, the empirical for formula of the substance is [tex]MgCl_2[/tex]
The empirical formula of the compound formed when magnesium reacts with chlorine is MgCl₂.
To determine the empirical formula of the compound formed when magnesium (Mg) reacts with chlorine (Cl), we need to find the ratio of the elements in terms of moles.
First, we calculate the number of moles of each element:
Moles of Mg = Mass of Mg / Molar mass of Mg
Moles of Mg = 1.2 g / 24 g/mol
Moles of Mg = 0.05 mol
Moles of Cl = Mass of Cl / Molar mass of Cl
Moles of Cl = 3.55 g / 35.5 g/mol
Moles of Cl = 0.1 mol
Next, we determine the simplest whole-number ratio between the moles of Mg and Cl:
Mg:Cl = 0.05 mol : 0.1 mol
To simplify the ratio, we divide both values by the smaller value (0.05 mol in this case):
Mg:Cl = 0.05 mol / 0.05 mol : 0.1 mol / 0.05 mol
Mg:Cl = 1 : 2
Therefore, the empirical formula of the compound formed when magnesium reacts with chlorine is MgCl₂.
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Where do you find elements that have energy levels that are all full of electrons? (1 point)
across the bottom of the periodic table
on the right side of the periodic table
on the left side of the periodic table
across the top of the periodic table
Answer:
पेरिोदिछ ताबले माछकिनौय
Answer:
on the right side of the periodic table
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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Dieldrin is a pesticide that is effective in killing?
Answer:
fddoiiijjjjjjjhhggggrrddffgghuuiii
What is the main difference between dew and clouds?
Answer:
dew is wet and clouds are not
Explanation:
answer right pleases
The unknown metal ion gave a yellow/orange flame test and no precipitate with ammonium carbonate. What is the unknown metal?
Answer:
Sodium
Explanation: