What is the best method of eye protection in laboratory?
Answer:
goggles
Explanation:
...................
You find a ring with a mass of 89.2g. You fill a graduated cylinder up with 10mL of water
and put the ring into the cylinder. The water mark rises up to the 20mL mark. What is
the ring made of
Solids
Table of Densities
Density g/cm
Solids
2.56
Copper
264
Gold
Density g/cm
8.92
Marble
19.32
Diamond
3.52
Platinum
21.4
O Marble
O Quartz
Copper
Gold
Answer:
Ring is made up off copper.
Explanation:
Given data:
Mass of ring = 89.2 g
Volume of water = 10 mL
Volume of water + ring = 20 mL
Ring is made up of = ?
Solution:
Volume of ring = (Volume of water + ring) - Volume of water
Volume of ring = 20 mL - 10 mL
Volume of ring = 10 mL
Density:
Density = mass/volume ( 1 mL = 1 cm³)
d = 89.2 g/ 10cm³
d = 8.92 g/cm³
Thus, ring is made up off copper.
The two liquids of the mixture having the same boiling point cannot be seperation of distillation Explain.
Answer:
True
Explanation:
Two liquids of a mixture having the same boiling point cannot be separated using the process of distillation.
Distillation is one of the process of physical separation techniques.
It relies on physical property called the boiling point. In a fractionating column, a mixture is heatedAs the boiling point of the each component compound in the mixture is reached, the compound rises up within the column.So without a difference in the boiling point of the compound that makes up a mixture, the separation by distillation will not be possible.
what is 2 multiplied by 4
Answer:
8
Explanation:
Answer:
the answer is 8 :D
Explanation:
2x4 also known as 2+2+2+2 is equal to 8
Which subatomic particle gains energy from the flame and then loses it in the form of light?
Answer:fire?
Explanation: it gains heat from heat/friction, and losses it if its been lighted up for too long (it can be used as light)
Is the Food Pyramid important to Humans and our Digestive Systems? Explain why or why not below please use a complete sentence, or put what the one thing that we cannot digest but is in the food pyramid.
Answer:
The food pyramid is just to make people have a healthier "Diet."
Explanation:
It shows the food groups we eat and which ones to put together to make a healthy diet. Eating the right amount of each food group is called a "Balance" diet. Therefore, its not needed, but it is useful.
Which change of state is shown in the model?
condensation
deposition
boiling
freezing
Answer:
Deposition
Explanation:
The process of deposition is when an object goes from a gas to a solid. In the picture, the first container had a gas (molecules were far apart). In the second, the molecules were tightly packed (a solid).
Hope this helps!
Write the names of the following covalent compounds: SiO2
Answer:
Silicon dioxide
Explanation:
Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO₂, most commonly found in nature as quartz and in various living organisms. In many parts of the world, silica is the major constituent of sand.
The name of the following covalent compound: SiO₂ is silicon oxide.
What is the name of the covalent compound?The name of the covalent compound is silicon oxide. Note that covalent compounds are known for their ability to share electrons. This is the case with the compound, silicon oxide that shares electrons with oxygen.
In the compound, there are two atoms of oxygen and one atom of silicon.. So, the name of the compound is silicon oxide.
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Which substance is a pure substance? Cereal Silver Jelly bean Shampoo
Answer: Silver
Explanation:
Answer:
SILVERRRRRRRRRRR
Explanation:
Select the correct answer.
What are the oxidizing agent and the reducing agent in this chemical equation?
3FeS + 8HNO3 → 3FeSO4 + 8NO + 4H2O
A.
FeS is the oxidizing agent, and HNO3 is the reducing agent.
B.
HNO3 is the oxidizing agent, and NO is the reducing agent.
C.
FeS is the reducing agent, and HNO3 is the oxidizing agent.
D.
HNO3 is the reducing agent, and NO is the oxidizing agent.
Answer:
Its answer choice C
Which element would most likely bond with lithium and form an ionic compound?
Answer:
(Please make sure to re-write this on your own to make sure that your teacher doesn't think your cheating!) Fluoride.Explanation:Ionic bonding is the type of bond that is made between a nonmetal and a metal. In this type of union, one of the elements yields electrons and the other accepts electrons.
In this case, the metal is Lithium, we need a nonmetal to complete the union. (Don't know if you need this or anything but here you go)
Beryllium is a metal.
Calcium is a metal.
Fluoride is a nonmetal.
Sodium is a metal.
After the analysis, we conclude that the correct answer is Fluoride since it is the only one that is a nonmetal.
Which set of elements below is the most similar in chemical behavior?
OH, Be, SC
O Fr, Ra, Rf
O TI, V, Cr
O Be, Ca, Ra
Answer: Be, Ca, Ra
Explanation:
Elements are distributed in groups and periods in a periodic table.
Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons.
Berrylium (Be) , Calcium (Ca) and radon (Rn) are elements which belong to Group 2. They have 4, 20 and 88 electrons respectively and contain 2 valence electrons each and thus can lose two electrons to complete their octet. Thus they will show similar chemical properties.
The chemical reactivity of elements is governed by the valence electrons present in the element.
A 25.0 mL sample of 0.100 M lactic acid (HC3H503, Ka = 1.4 E-4) is titrated with 0.100 M NaOH solution. Calculate the pH of the resulting
solution after 0.0ml of NaOH have been added
Calcium carbonate forms limestone, one of the most common rocks on Earth. It also forms stalactites, stalagmites, and many other types of formations found in caves. When calcium carbonate (CaCO3) is heated, it decomposes to form solid calcium oxide and carbon dioxide gas. Write the balanced equation and calculate how many liters of carbon dioxide will be produced at STP if 2.38 g of calcium carbonate reacts completely?
Answer: [tex]CaCO_3(s)\rightarrow CaO(s)+CO_2(g)[/tex] , 0.533 L
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
[tex]CaCO_3(s)\rightarrow CaO(s)+CO_2(g)[/tex]
According to avogadro's law, 1 mole of every substance occupies 22.4 L of volume at STP.
Number of moles =[tex]\frac{\text {given mass}}{\text {Molar mass}}[/tex]
moles of calcium carbonate = [tex]\frac{2.38g}{100g/mol}=0.0238mol[/tex]
As 1 mole of calcium carbonate produces = 22.4 L of carbon dioxide at STP
Thus 0.0238 moles of calcium carbonate produces =[tex]\frac{22.4 L}{1}\times 0.0238=0.533L[/tex] of carbon dioxide at STP
The balanced equation is [tex]CaCO_3(s) \rightarrow CaO(s) + CO_2(g)[/tex]
The number of liters of carbon dioxide that should be produced is 0.533L
Law of conversation of mass:As per this law, the mass could neither be developed nor be destroyed. So, the mass of products should be equivalent to the mass of reactants. The number of atoms of every element has to be the similar on reactant and product sides. Due to this, the chemical equations are balanced.
[tex]CaCO_3(s) \rightarrow CaO(s) + CO_2(g)[/tex]
Avogadro's law:As per this law, 1 mole of every substance occupies 22.4 L of volume at STP.
So,
We know that
Number of moles = [tex]given\ mass \div molar\ mass[/tex]
Now the moles of calcium carbonate is [tex]= 2.38 \div 100[/tex] = 0.0238 mol
Since 1 mole of calcium carbonate generated = 22.4 L of carbon dioxide at STP
So, 0.0238 moles of calcium carbonate generated
[tex]= 22.4 \div 1 \times 0.0238 \\\\= 0.533L[/tex]
of carbon dioxide at STP
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What happens in cellular respiration?
A. Glucose reacts with water in the stomach to produce
energy.
B. Glucose and oxygen react to form carbon dioxide, water,
and heat.
O C. Glucose is broken down to provide oxygen for all cells in
the body.
D. Glucose is formed from smaller hydrocarbons in the body.
Answer:
Option B
Explanation:
The reaction can be summarized as
6O2+C6H12O6——›6CO2+6H2O+Heat
Answer:
B
Explanation:
Explain why the noble gases are unusually stable.
Answer:
Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.
Explanation:
Write a caption for a photo of a polluted city.
Answer:
ok
Explanation:
this is a picture of a city that we have made worse everyday
When ionic compounds are added to water, they dissociate or break apart into ions. In the case of table salt, salt added to water dissociates into sodium ions and chloride ions. This would seem to be a chemical change. However, scientists do not consider this to be one, because the solid table salt remains after the water is evaporated. The atoms recombine into their original arrangement once the water is removed.
Which word from the selection helps you understand that physical changes can be undone?
a added
b dissociate
c recombine.
d removed
ill mark brainliest plz help
Answer:
option d
Explanation:
please mark me brainliest
Answer: S₅Br₆
Explanation: The prefix “penta-“ means five, and the prefix “hexa-“ means six.
Why does the density of a substance stay constant even if the mass of the substance increases?
Answer:
If the mass stays constant the object's density decreases as the volume increases. ... Because the property of density is a constant for all variables, density can be used to identify the material an object is made of.
Explanation:
. Both element K and element L are found in period 3 of the periodic
table. If K is in group 13 while L is in group 15, which of the two
has a greater atomic number? Explain.
Answer: L element has greater atomic number.
Explanation:
The periodic table contains vertical columns called as groups and horizontal rows called as periods.
Period 3 contains 8 elements which are sodium, magnesium , aluminium , silicon , phosphorous , sulphur, chlorine and argon.
K element which belongs to group 13 is aluminium with atomic number of 13 . L element which belongs to group 15 is phosphorous with atomic number of 15.
Thus L element has greater atomic number.
The ___ is the nations consumer protection agency to help prevent fraud , deception , and unfair business practices .
Answer:
I think it B
Explanation:
Answer:
The answer is FTC or C!!!!!!!!!!!!!!!!!!!!!!!!!!!
Explanation:
How does the activity series of metals reflect the stability of metals?
A. The metals lowest on the list are the least stable.
B. The metals highest on the list are the most stable.
C. The metals lowest on the list are the most reactive.
D. The metals highest on the list are the least stable.
The activity series of metals reflect the stability of metals are "the metals highest on the list are the least stable."
What is activity series?The organization of metals in a declining sequence of respective reactivities is referred to as the "activity series," also described as the "reactivity series" of metals.
What is metals?Materials having the qualities of being bright, hard, fusible, malleable, ductile, etc. were known as metals.
The activity series of metals reflect the stability of metals are "the metals highest on the list are the least stable."
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Chemical ____ are used to represent compounds
Answer:
Its formula :)
Explanation:
hope this helps <3
Which of the following is a way that human modification of limiting factors causes unbalance in ecosystems.
Answer:
D. all of the above
Explanation:
edg 2021
A way that human modification of limiting factors causes unbalances in ecosystems. are habitat loss, pollution, and climate change. Option D. This is further explained below.
What is an ecosystem.?Generally, An ecosystem is a geographical region in which plants, animals, and other species, as well as weather and topography, coexist to produce a circle.
In conclusion, habitat loss, pollution, and climate change are all human modification of limiting factors causes unbalance in ecosystems.
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CQ
which of the following is a way that human modification of limiting factors causes unbalance in ecosystems? a. habitat loss b. pollution c. climate changes d. all of the above
PLZ help can you find a picture of the IODINE PLANITERY model please help
Answer:
yes I can find a pic of the iodine planetary model
Explanation:
U my friend OMG ^-^
2. A gas that has a volume of 28 liters, a ternperature of 45 °C, and an unknown
pressure has its volume increased to 34 iters and its temperature decreased to
35 °C. If I measure the pressure after the change to be 2.0 atm, what was the
original pressure of the gas?
The original pressure of the gas : 2.507 atm
Further explanationBoyle's law and Gay Lussac's law
[tex]\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}[/tex]
P1 = initial gas pressure (N/m² or Pa)
V1 = initial gas volume (m³)
P2 = final gas pressure
V2 = final gas volume
T1 = initial gas temperature (K)
T2 = final gas temperature
V₁=28 L
T₁=45+273=318 K
P₂=2 atm
V₂=34 L
T₂=35+273=308 K
then initial pressure :
[tex]\tt P_1=\dfrac{P_2.V_2.T_1}{V_1.T_2}\\\\P_1=\dfrac{2\times 34\times 318}{28\times 308}\\\\P_1=2.507~atm[/tex]
Fill in the blank with the correct vocabulary word: H20 (1) --> H2 (g) + O2 (g) Water is the and hydrogen gas is the
Answer:
Water is reactant and hydrogen gas is product
Explanation:
One of your classmates tells you, “Since atoms are the basic building blocks of matter, all atoms have to be the same. Do you agree or disagree with this statement? Explain your reasoning.
5. How many moles of calcium atoms are in each mole of calcium carbonate? (1 point)
Answer:
One mole of calcium is present in one mole of calcium carbonate
Explanation:
Because its formula is CaCO3
Ca contains 2+ charge and CO3 contains 2- charge