How much energy is needed to turn 450 g of zinc into liquid metal at its melting point? (Round your answer to the nearest tenth) *
Answer:
Explanation:
Latent heat of fusion of zinc = 7.322 kJ / mol
molecular weight of zinc = 65 g
450 gram = 450 / 65 = 6.92 mole
Heat required to melt 450 g of zinc = 6.92 x 7.322 kJ
= 50.67 kJ .
= 50.7 kJ .
Rank the three elements according to their ionization energy,
from highest to lowest:
Chlorine (CI), Strontium (Sr), lodine (1)
Which is a change or signal in the environment that can make an organism
react? *
stimulus
O reaction
impulse
O
response
Answer:
I'm pretty sure its stimulus
Which two parts are needed to make a neutral atom of nitrogen A. Electron clouds with a total of 14 electrons B. Electron cloud is a total of seven electrons C. A nucleus with seven protons and seven neutrons D. A nucleus with three protons and four neutrons
Answer:
B. Electron cloud is a total of seven electrons
C. A nucleus with seven protons and seven neutrons
Explanation:
An atom is consist of three subatomic particles: electron, proton, and neutron. Proton are positively charged particles and neutron have neutral charge, they both are present inside the nucleus in the center of the atom whereas electrons are negatively charged and surround the nucleus in a definite orbit.
Nitrogen is an element with 7 electrons in its outer orbit. As electrons are negatively charged so nitrogen atom will require 7 protons inside the nucleus to form a neutral atom of nitrogen. So, A neutral atom of nitrogen will consist of 7 electrons and 7 protons.
As, neutron has neutral charge so it will not affect the composition of neutral atom of nitrogen.
Hence, the correct options are:
"B. Electron cloud is a total of seven electrons
C. A nucleus with seven protons and seven neutrons ".
Answer:
B and C
Explanation:
Because of metallic bonding, when light is pointed at metals, they become
Oshiny
O malleable.
O ductile.
O conductive,
Owing to the electronic configuration of metals ,metallic bonding exists in metals because of which when light is pointed at them they become shiny.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
Learn more about electronic configuration,here:
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Metamorphic means “________________.”
A}to turn into rock
B]to make into minerals
C]to change form
D]to press down
In Greek metamorphic means 'to change form ' . Hence the answer to this question will be ;
C) To change form
Jose adds five grams of a chemical to one liter of liquid and observes a reaction. If the reaction is endothermic, what will happen?
A
The liquid's mass increases; therefore, the volume of the liquid will increase
B
The liquids' mass decreases; therefore, the volume of the liquid will decrease.
С
Energy is released during the reaction; therefore, the temperature of the liquid will increase.
Energy is absorbed during the reaction; therefore, the temperature of the liquid will decrease.
D
Answer:
D. Energy is absorbed during the reaction; therefore, the temperature of the liquid will decrease
Explanation:
In a chemical reaction, the reaction is said to be ENDOTHERMIC if the reaction utilizes or uses energy instead of given it off. In this reaction, Jose adds five grams of a chemical to one liter of liquid and observes the reaction.
According to this question, the reaction is ENDOTHERMIC. This means that energy is absorbed or used up during the reaction; therefore, the temperature of the liquid will decrease i.e. the liquid used in the reaction will become COLDER.
Why don’t all salts make a one-to-one ratio?
Answer:
because all types of salts are made up of different substrances
All salts do not make a one-to-one ratio because the salts are composed of different ions that combine together in different ratios.
A salt is an ionic substance. Salts are formed by combination of a cation and and anion.
Different salts are comprised of different ions. The ratios in which the ions combine in each salt is not the same.
Hence, all salts do not make a one-to-one ratio because the salts are composed of different ions that combine together in different ratios.
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Problem Page Decide whether these proposed Lewis structures are reasonable. proposed Lewis structure Is the proposed Lewis structure reasonable? Yes. No, it has the wrong number of valence electrons. The correct number is: No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are:* Yes. No, it has the wrong number of valence electrons. The correct number is: No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are:*
The question is incomplete, the complete question is shown in the image attached.
Answer:
1) No, it has the right number of valence electrons but does not satisfy the octet rule.
2) Yes
3) No, it has the wrong number of valence electrons, the correct number is 16
Explanation:
If we look at the first structure in the image(HCN), it easy to see from inspection that nitrogen has three valence electrons as it is normally supposed to have. However, if we count all the electrons around nitrogen, we will notice that they are six instead of eight. Thus nitrogen has not satisfied the octet rule here.
The structure HBr satisfies the octet rule, hence it is a reasonable Lewis structures for the compound shown.
CO2 has 16 valence electrons but the structure shown contains about 20 valence electrons hence it is not a reasonable Lewis structure for the compound.
Yes, in HCO⁺ the proposed lewis structure is reasonable.
No, COCl₂ has the wrong number of valence electrons.
No, OH⁻ has the right valence electron but does not obey the octet rule.
The correct structure for the question can be seen in the image attached below.
In the proposed structure, the number of valence electrons in HCO⁺ is: ( 1 + 4 + (6-1) ) = 10e⁻Thus, the atoms obey the octet rule and the number of calculated valence electrons corresponds with what we have in the given structure.
Yes, the structure is correct and reasonable.
In COCl₂, the central carbon bonding to the oxygen is supposed to be doubly bonded and not singly bonded.the number of valence electron in COCl₂ is: ( 4 + 6 + (7 × 2)) = 24e⁻The calculated number of valence electrons is different from the given structure of 26e⁻, so we can say No, it has a wrong number of valence electrons.
In the third structure, oxygen is supposed to have three lone pairs of electrons in order to obey the octet rule.the number of valence electrons in the structure is: (6 + (1+1) = 8e⁻
But both H, as well as, O do not obey the octet rule. Therefore, we say No, it has the right number of valence electron but do not obey the octet rule.
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Which molecule is the most polarizable?
N₂
O2
CH4
CO2
Answer:
CO2 I was wrong about methane
if there is a sample 50 grams of naoh how many grams are na
Answer:
Which number is IRRATIONAL? A) √12 B) √36 C) √64 D) √144
Explanation:
List three organelles found in cells and describe their functions.
nucleus: controls cell
cell membrane: controls what goes in and out of a cell
cytoplasm: where chemical reactions take place
Answer:
Nucleus: DNA Storage
Mitochondrion Energy production
smooth Endoplasmic Reticulum (SER) Lipid production; Detoxification
The layer of skin that forms the fingerprint is called the
Answer:
Explanation:
The fingerprints are produced from a layer in the skin called the papillary layer, which is a layer within the dermis layer of skin. It produces an extra thick layer to form the ridges of fingerprints.
Answer:
Dermis
Explanation:
The inner layer of skin is called the dermis. It is thicker and provides the protection and support that the skin provides the body. The two layers are separated by the basement membrane. Fingerprints are produced by the epidermis.
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Potassium (K) is a soft, silver, solid metal. It is widely found in food we eat.
11
Na
22.990
Sodium
19
K
39.098
Potassium
37
Rb
85.488
Rubidium
Which statement correctly and accurately describes atoms of Rubidium?
Answer:
What is all that stuff
Explanation:
True or false igneous rocks can only turn into metamorphic
Answer:
this is false igneous rocks can turn into either sedimentary rocks and they can be metamorphic
Explanation:
i hope this helps your welcome :)
Answer:
False
Explanation:
Igneous rocks can turn into sedimentary rocks as well as metamorphic.
Pleaseee help it’s timed!!
Answer:
voliiviloou
Explanation:
volaiviolu
Answer:
Rows
Explanation:
please help me!! thank you so much!!
Answer:
13.75
Explanation:
gets halved every 8 days so halved twice
What kind of graph would use for this data? The months of the year and the amount of rainfall, and why
Answer:
A Desert Climatogram is a graph that shows the temperature and rainfall, for each month in the year, for the Desert.
Explanation:
What are some real world examples of physical change and chemical change ?
Answer:
Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.
Explanation:
Why sodium called alkali
metals .
Answer:
The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).
Explanation:
They are called alkali metals because they are in the alkali group.
Where are earthquakes most likely to occur? A. Where Earth’s tectonic plates are sliding past each other. B. Where magma cools slowly beneath Earth’s surface. C. Where Earth’s lithosphere is in constant, slow motion. D. Where Earth’s seafloor is spreading into deep ocean trenches.
Answer:
d
Explanation:
Answer:
A
Explanation:
When the tectonic plates slide across each other they cause a huge vibration making the area around Shake if its a big enough of vibration it can breach the surface causing a huge crack.
In which cell will the molecules diffuse out A or B
How would you describe the conditions in the lower mantle?
Answer:
hi..
Explanation:
The lower mantle is hotter and denser than the upper mantle and transition zone. The lower mantle is much less ductile than the upper mantle and transition zone. Although heat usually correspond s to softening rocks, intense pressure keeps the lower mantle solid. Geologists do not agree about the structure of the lower mantle.
hope this helps ._.
very hot at temperatures, i think i would set it to 43 degrees celsius as its much colder and better
hope this helps!
does anyone know how to do the alien periodic table im stuck and cant go furhter
Answer:
The answers that I drew in blue are for the first part then it will say click a nonmetal or something which is the one I drew in Red.
Explanation:
Hope this helps
I WILL GIVE YOU BRAINLIEST HELP ME!!!
Answer:
It is the first one
Explanation:
Due to the fact that political discretion would be so only a few or a group of indviduals could control or know certain things
Answer: yeah is the first one
Explanation:
PLeaseee Help Asap!!!
i need help ASAP ! Please
Answer:
Your friend gave the better response
Explanation:
Formula for density:
Density = mass/volume
p = m/v
Let's substitute the given values into the equation:
p = m/v
p = 23.2/8.593
Solve:
p = 23.2/8.593
p = 2.69987198883
2.69987198883 grams per volume
Notice that 2.69987198883 is the exact answer. Your answer is 2.67, which is inaccurate, even if rounded. If you were to round the exact answer to the nearest hundredth, it would be 2.70 which is not 2.67.
Therefore, your friend gave the better response because it is the correct answer.
density equals mass over volume
23.2/8.593 = 2.69 g/mL
Question 5 (4 points)
One type of dipole-dipole force found in water is
A. ion-ion attraction
B. hydrogen bonds
C. dipole-ion bonds
D. molecular bonds
Answer:
B. Hydrogen bonds.
Explanation:
The dipole dipole force that is found in water is hydrogen bonds.
does this picture show a physical or chemical change?
Answer:
Those photos are a chemical change
C12H7Cl3FNaO2 what are them elements in that chemical formula