Answer:
What is that? I do not understand
How many molecules are their in o.5 mole of H2o
Answer:
There are 6.022x10^23 molecules
Vanadium (V) phosphate
Cobalt(II) sulfide
Beryllium nitrate
Silver sulfate
Manganese(IV) oxide
Manganese(II) fluoride
Carbonic acid
Carbon dioxide
name them
A chunk of copper has a volume of 20.0 mL. What is its mass?
The mass of the chunk of copper is 179.2g
WHAT IS DENSITY:
Density of an object refers to its mass in relation to its volume i.e. density can be calculated by dividing the mass of an object by its volume. This means that if the density of an element or substance is known, the mass can be calculated in a given volume.The density of Copper element is 8.96g/mL
Since density = mass (g) ÷ volume (mL)
8.96 = mass ÷ 20mL
mass = 20 × 8.96
mass = 179.2g
Therefore, the mass of the chunk of copper is 179.2g
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What is a mixture? How will you separate the components of a mixture containing sugar, sand and water?
Answer:
Mixture is combination of two or more substances
Explanation:
The sugar would dissolve in water. You could then pour off the solution and wash the remaining sand with a bit more water. Heat the water to evaporate it from the sugar, and the two are separated.
Which option is an isotope with 6 protons and 8 neutrons?
A - carbon-14
B - oxygen-14
C - carbon-8
D - oxygen-6
What are the differences of a physical change and a chemical change?
Answer:
a physical change only changes the look of something whereas a chemical change occurs when one thing has a reaction and it forms a new substance.
Subject:.
Date:
8 a) vinyl
chloride C₂H₂ is prepared by the reaction of ethyne gas C₂H₂ with hydrochloric
acid, HCl.
Answer:
Yes it is true
Explanation:
vinyl chloride is prepared by c2h2+hcl. Since vinyl chloride is formed after ETHYNE IS MIXED WITH CHLORIDE.
3. Write the chemical formula of the following compounds using criss-cross
method:
a. Sodium Oxide
b. Silver Oxide
Answer:
a) Na2O
b) Ag2O
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Name the type of reaction illustrated
Answer:
It is a reversible esterification reaction.
Explanation:
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Which of these statements best describes how mining of minerals helps solve societal problems?
A) By reducing pollution in air.
B) By removing contaminants from the soil.
C) By improving the condition of groundwater.
D) By providing jobs to the unemployed people
Answer:
d cause it is
Explanation:
Which of the following examples shows an increase of energy in the particles of matter? (Select THREE that are true)
liquid to solid
liquid to gas
gas to liquid
OOO
solid to liquid
solid to gas
The reaction described by the equation X + Y Z
shown to have the following rate law:
R = K[X] [Y]
What is the effect on the rate if the concentration
of [X] is doubled and [Y] remains constant?
What is the final temperature of water given an initial temperature of 28 ˚C, a mass of 7 g, and heat (q) of 184 J (Specific Heat of water = 4.184 )?
Answer:34.28 Degree celcius
Explanation:The heat given is equal to the change in temperature multiplied by the mass and the specific heat capacity
This gives the equation:Q=mc∆T
Where Q=184,m=7, specific heat capacity=4.184,∆T=X-28,
But ∆T=Final temperature (T'')-Initial temperature (T')
Therefore the equation becomes
184=7×4.184(X-28)
Solving the remaining linear equation gives you X as 34.28°C
How much of a chemical should you take?
Answer:
No more than 0.1 mL of hydrochloricton acid
a substance made up of similar atoms
Answer:
A pure substance composed of the same type of atom throughout. Compound: A substance made of two or more elements that are chemically combined in fixed amounts.
What is a measure of the amount of
matter (particles) in an object?
A. Length
B. Mass
C. Weight
D. Volume
Answer:
B. Mass
Explanation:
Matter is all the “stuff” that exists in the universe. It has both mass and volume. · Mass measures the amount of matter in a substance or an object.
hope i helped
3. If we remember seeing something happen, we can trust that it happened just as we think it did. True or False
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.
[tex]\huge\mathfrak\purple{Hope \: it \: helps}[/tex]
Note : Because Many of My Dreams came true and I realized.
Which element forms a chloride of the type XCl2
A:strontium
B:xenon
C:antimony
D:tellurium
E:tin
F:iodine
Explanation:
Element X forms a chloride with the formula XCl 2 , which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as. (a) Na (b) Mg (c) Al (d) Si. the answer is Mg .
Which of the following words means "the degree to which a measurement is precise and reliable"?
a. variable
b. accuracy
c. parameter
d. constant
Which type of model best represents crystals?
A. ribbon
B. space-fill
C. ball-and-stick
D. Lewis dot
A space filling model is a representation in which atoms of a compound appear as spheres of equal diameter. Crystals are best represented using space filling model.
Crystals are composed of atoms or molecules of a substance that are arranged in a regular and repeating pattern.
While ball and stick models offer an effective representation for discrete molecules, a space filling model is more apt for a crystal since the components are repeating at regular intervals.
Hence the correct answer is option B: space-fill. The space filling model of sodium chloride crystal is shown in the image attached.
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Tell me the mass number of an atom with 4 protons, 5 neutrons, and 2 electrons.
Answer:
I'm pretty sure your answer will be 9
Answer:
9
Explanation:
Mass number = proton + neutron
= 4 + 5
= 9
Is burning a lot a physical or chemical change?
burning is irreversible change so its chemical change
At what temperature does water boil if 75.0 g of glucose (180.1 g/mol) is added to 400 g of water?
A. 100.25 degree C
B. 100.53degree C
C. 100.84degree C
D. 101.39degree C
E. 101.94degree C
Answer:
A
Explanation:
Because it have more glucose
At 100.25 degree C temperature does water boil if 75.0 g of glucose (180.1 g/mol) is added to 400 g of water. Hence option A is correct.
What is temperature?Temperature is defined as the measuring a substance's degree of heat or cold. The direction of heat transfer when two bodies with different temperatures are kept in touch depends on the temperature. An instrument that measures temperature is a thermometer.
Glucose is defined as one of the carbohydrates classified as simple sugars. The brain is the most energy-hungry organ in the body and uses half of the body's sugar energy due to its abundance of nerve cells, or neurons. Thinking, memory, and learning are all tightly correlated with blood glucose levels and how effectively the brain uses this fuel.
Thus, at 100.25 degree C temperature does water boil if 75.0 g of glucose (180.1 g/mol) is added to 400 g of water. Hence option A is correct.
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The following reaction is exothermic. 2 N2O(g) 2 N2(g) O2(g) This means the reaction: 56) A) will be spontaneous only at low temperatures B) is not spontaneous at any temperature C) will be spontaneous only at high temperature D) will be spontaneous at all temperatures E) cannot determine without temperature
For exothermic processes, spontaneity will only occur if the entropy positive with all temperature or if the entropy is negative with only low temperature.
Since the given equation decomposed from 2 moles of gas into 3 moles of gas, we know that entropy is positive. Thus the reaction will be spontaneous at all temperature.
D is the answer
what is joules? plz help
An ion is formed by either
Explanation:
By definition, an ion is an electrically charged particle produced by either removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion. When an ion is formed, the number of protons does not change.
Answer:
Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions.
Explanation:
by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms. Examples of these processes include the reaction of a sodium atom with a chlorine atom to form a sodium cation and a chloride anion; the addition of a hydrogen cation to an ammonia molecule to form an ammonium cation; and the dissociation of a water molecule to form a hydrogen cation and a hydroxide anion.
Balance this equations pH3+O2=P4O10+H2O
Because there are 4 P on the right side, we have to put a coefficient of 4 on the left to balance out the P.
This would give us 12 H on the left and 2 H on the right, so we have to put a 6 on the right to balance out the H.
Now we have 16 O on the left and 2 on the right, so a coefficient of 8 is required to balance out the O.
Technician A says it is OK to have poor safety practices because you can always clean up the mess. Technician B says keeping a high standard of personal hygiene and cleanliness is important so that you get into the habit of washing off harmful materials as soon as possible after contact. Who is correct? Select one: a. Technician A O b. Technician B O C. Both A and B O d. Neither Anor B
Write the electronic configuration of elements from Hydrogen to Calcium
ans as fast as you can
Answer:
Hydrogen (H) 1s1
Helium (He) 1s2
Lithium (Li) 1s2 2s1
Beryllium (Be) 1s2 2s2
Boron (B) 1s2 2s2 2p1
Carbon (C) 1s2 2s2 2p2
Nitrogen (N) 1s2 2s2 2p3
Oxygen (O) 1s2 2s2 2p4
Fluorine (F) 1s2 2s2 2p5
Neon (Ne) 1s2 2s2 2p6
Sodium (Na) 1s2 2s2 2p6 3s1
Magnesium (Mg) 1s2 2s2 2p6 3s2
Aluminum (Al) 1s2 2s2 2p6 3s2 3p1
Silicon (Si) 1s2 2s2 2p6 3s2 3p2
Phosphorus (P) 1s2 2s2 2p6 3s2 3p3
Sulfur (S) 1s2 2s2 2p6 3s2 3p4
Chlorine (Cl) 1s2 2s2 2p6 3s2 3p5
Argon (Ar) 1s2 2s2 2p6 3s2 3p6
Potassium (K) 1s2 2s2 2p6 3s2 3p6 4s1
Calcium (Ca) 1s2 2s2 2p6 3s2 3p6 4s2
Explanation:
explain with the help of examples difference between elements and compounds
Answer:
Elements are pure substances which are composed of only one type of atom. Compound are substances which are formed by two or more different types of elements that are united chemically in fixed proportions. ... Some of the examples of elements are Iron, Copper, Gold, etc. A few examples of compounds are NaOH, NaCl, etc.