Answers
Answer:
3) The salivary glands present in the mouth produces saliva
Related Questions
Pls answer asap! NO ATTACHMENTS!!!
Answers
Plllllzzzzzzzz helppppppppppp science helpppp 20 points plzzz help.
Sierra has a special kind of liquid rubber. She knows that ultraviolet light is absorbed by the rubber, X-ray light is transmitted through the rubber, and blue light is reflected off the rubber. Sierra wonders if the liquid rubber will become solid if she shines the lights on it. Can light cause the rubber to become solid? Why or why not? Does it matter what type of light she shines on the rubber?
Answers
Answer:
yes it can because heat can solidify the rubber and it does matter what light
Explanation:
The light can cause the rubber to become solid. It doesn't matter the type of light.
Any type of light can cause the rubber to become solid because all types of
light emit thermal(heat) radiation. When they are emitted , it causes the
vaporization of some compounds thereby causing it to solidify.
In this scenario, the rubber being able to absorb ultraviolet light simply
depicts that it will solidify as a result of an increase in temperature due to
the thermal radiation.
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determining the molecular formula of a hydrocarbon with a relative molecular mass of 54
Answers
Answer:
C₄H₆
Explanation:
A hydrocarbon is a molecule that only contains atoms of Carbon and Hydrogen. As you remember, the molar mass of Carbon is 12g/mol and the molar mass of Hydrogen is 1g/mol.
To solve this question we can find the amount of Carbons necessary that doesn't exceed the 54g/mol. That is:
54g/mol / 12g/mol = 4.5
As the molecular formula must be given in whole numbers, the amount of Carbons is 4. This 4 carbons have a mass of:
12g/mol*4 = 48g/mol
And the hydrogens necessaries to suply the molecular mass are:
54 - 48 = 6 hydrogens
That means molecular formula is:
C₄H₆10. What is the Kinetic Energy of a 100 kg object that is moving with a speed of 13.5 m/s?
Answers
Answer:
[tex]100 \times 13.5 = ikw n bahaa[/tex]
IKAW na mag tayms
Most of the matter making up the earth is composed of
A. gases
B. compounds
C. mixtures
Answers
Most of the matter making up earth is composed of compounds. I think
b) How many moles of Na2O can be produced from 13.5 moles Na?
Answers
Answer: 6.75 moles of [tex]Na_2O[/tex] can be produced from 13.5 moles Na
Explanation:
The balanced chemical equation for formation of [tex]Na_2O[/tex] from Na is:
[tex]4Na+O_2\rightarrow 2Na_2O[/tex]
According to stoichiometry :
4 moles of Na give = 2 moles of [tex]Na_2O[/tex]
Thus 13.5 moles of [tex]Na[/tex] give =[tex]\frac{2}{4}\times 13.5=6.75moles[/tex] of [tex]Na_2O[/tex]
Thus 6.75 moles of [tex]Na_2O[/tex] can be produced from 13.5 moles Na
Predict the nature of the indicated covalent
bond.
polar or non-polar
Answers
The nature of the indicated covalent bond in water molecule is polar.
What is a covalent bond?A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.
Examples of compounds that exhibit covalent bondOxygenChlorine gasWater (H₂O), etcPolarity of waterThe atoms that make up the molecule of water causes the water molecule to be polar because of its shape.
Thus, the nature of the indicated covalent bond in water molecule is polar.
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Only awnser #5#6#7#8 please 20 points! And i will mark brainliest.
Answers
6. 27 Million F
7. photosphere
8. 17 Million degrees
Answer:
5. radiative zone 6. 27 million degrees Farenheit 7. photosphere 8. approximately 25 million degrees Farenheit if using the calculation for the core temperature of the sun at 27 million degrees as the corona is 2 million degrees
Explanation:
The process by which sand is formed from rocks are...
Question 1 options:
melting and cooling
compaction and cementation
heat and pressure
weathering and erosion
Answers
Answer:
weathering and erosion
Explanation:
Sand forms when rocks break down from weathering and eroding over thousands and even millions of years. Rocks take time to decompose, especially quartz (silica) and feldspar. Often starting thousands of miles from the ocean, rocks slowly travel down rivers and streams, constantly breaking down along the way.
Answer:
weathering and erosion
why is the absolute dating of rocks important?
Answers
Answer:
The dating of rocks is important because:
Explanation:
its important to know how the rocks have changed.
Select the correct answer.
What does an atom gain or lose in an oxidation-reduction reaction?
A.
protons
B.
oxygen
C.
neutrons
D.
electrons
Answers
Answer:
D The atom gains an electron in an oxidation-reduction reaction.
Someone help please?- Ill give brainilist.
Answers
Answers:
1. Carbon is to organic as silicon is to inorganic
2. Sugar is to carbohydrate as oil is to lipid
Explain how subscripts are used when counting atoms in a compound
Answers
Answer:
The number of atoms of each kind is indicated by a subscript following the atom. If there is only one atom, no number is written. If there is more than one atom of a specific kind, the number is written as a subscript following the atom.
B.Use the words inside the box to complete the chart below
Answers
Answer:
Answered below
Explanation:
>> ice is solid
>> water is liquid
>> Steam is gas
>> Ice → water = melting
>> water → steam = evaporation
>> steam → water = condensation
>> water → ice = freezing
*Riddle!* *Riddle!!* *Riddle!!!*
Answer these *science riddles*
1. What kind of chemical element hates to be a follower?
2. I come as a gas and I get in line with neon. I am also known as the home of a very super person. What am I?
3. What two periodic elements, when combined, heal?
4. What is black when you buy it, red when you use it, and gray when you throw it away?
5. I'm a god and also a planet and the same time I am a measure of heat. Who am I?
6. What goes up and down stairs without moving?
7. Give it food and it will live; give it water and it will die.
8. What can you catch but not throw?
9. I run, yet I have no legs. What am I?
10. Take one out and scratch my head, I am now black but once was red.
11. Remove the outside, cook the inside, eat the outside, throw away the inside.
12. What goes around the world and stays in a corner?
13. What gets wetter the more it dries?
14. The more there is, the less you see.
15. They come at night without being called and are lost in the day without being stolen.
Answers
Answer:
https://www.getriddles.com/science-riddles/
Explanation:
go to this link, you will find some answers
hope it helps!
What would be the oxidation number of the atoms in these compounds?
Answers
Answer:
Oxidation state] is defined as the charge an atom might be imagined to have when electrons are counted according to an agreed-upon set of rules:
The oxidation state of a free element (uncombined element) is zero for a simple (monoatomic) ion, the oxidation state is equal to the net charge on the ion.
Hydrogen has an oxidation state of 1 and oxygen has an oxidation state of −2 when they are present in most compounds. (Exceptions to this are that hydrogen has an oxidation state of −1 in hydrides of active metals, e.g. LiH, and oxygen has an oxidation state of −1 in peroxides, e.g. H2O2 the algebraic sum of oxidation states of all atoms in a neutral molecule must be zero, while in ions the algebraic sum of the oxidation states of the constituent atoms must be equal to the charge on the ion.
The same is written in my textbook. But how am I supposed to find the ox. number of an atom, which is in compound like K2UO4?
In H20 does the 2 apply to
Hydrogen, Oxygen, or Both?
Answers
Answer:
The difference is due to the fact that one water molecule has two hydrogen atoms to one oxygen atom, as explained above. This means it takes two water molecules (2 H2O) to make one oxygen molecule (O2)
Explanation:
Answer:
In H20 does the 2 apply to Hydrogen
Explanation:
In H₂O there is two atoms of hydrogen and 1 atom of Oxygen
Hence, In H20 does the 2 apply to Hydrogen
-TheUnknownScientist
What causes polar bonds
Answers
Answer:
Bonds are polar when one element in a compound is more electronegative than the other. This creates a dipole in the molecule where one end of the molecule is partially positive and one end is partially negative
Explanation:
Calculate the mass in grams of 550 mol of aluminum
Help please!
Answers
Answer:
Explanation:
1 mol of Aluminum = 26.98 grams
550 mol of Aluminum = x
1 * x = 550 * 26.98
x = 14839 grams
explain how of hope's apparatus can be used to demonstrate anomalous behaviour and water class 10
Answers
Answer:
The anomalous expansion of water refers to the fact that water, unlike most substances, expands when it freezes. The density of water increases as temperature decreases, but reaches a maximum at 4 degrees C then begins to expand. The significance of this is that ice is less dense than water so it floats in water.
This is of major biological importance. Lakes, ponds and streams freeze from the top down instead of from the bottom.
Calculate the volume of chlorine at stp that would be required to act completely with 3.70g of dry slaked line
Answers
Answer:
The volume required is 2.24L
Explanation:
The slaked lime Ca(OH)2, reacts with chlorine, Cl2, as follows:
6Cl₂(g) + 3Ca(OH)₂(s) → Ca(ClO₃)₂ (aq) + 2CaCl₂ (aq) + 6HCl (aq)
Where 6 moles of chlorine react with 3 moles of slaked llime,
To solve this question we must find the moles of slaked lime added. With these moles we can find the moles of chlorine required and its volume at STP as follows:
Moles Ca(OH)2 - Molar mass: 74.093g/mol-
3.70g * (1mol / 74.093g) = 0.0500 moles Ca(OH)2
Moles Cl₂:
0.0500 moles Ca(OH)2 * (6 mol Cl₂ / 3 mol Ca(OH)2) =
0.100 moles Cl₂
Now using PV = nRT
nRT / P = V
Where n are moles: 0.100 moles
R is gas constant = 0.082atmL/molK
T is absolute temperature = 273K at STP
P is pressure = 1atm at STP
And V is volume, our incognite:
0.100mol*0.082atmL/molK*273K / 1atm = V
2.24L = Volume of Cl₂
The volume required is 2.24Lanswer truthfully:))
Answers
Answer:
b) velocity.
c) velocity, m/s²
d)change in velocity, change in direction, change in both velocity and direction.
e) increasing or decreasing
A 5.0-g sample of Substance X increases in temperature from 20.0°C to 22.0°C when it absorbs 9.6J of heat. What is the specific heat of
Substance X in J/g °C)?
Answers
Answer:
0.96 J/g °C
General Formulas and Concepts:
Thermochemistry
Specific Heat Formula: q = mcΔT
m is mass (in grams)c is specific heat (in J/g °C)ΔT is change in temperature, final - initial (in °C)Explanation:
Step 1: Define
[Given] m = 5.0 g
[Given] ΔT = 22.0 °C - 20.0 °C = 2.0 °C
[Given] q = 9.6 J
[Solve] c
Step 2: Solve for c
Substitute in variables [Specific Heat Formula]: 9.6 J = (5.0 g)c(2.0 °C)[Specific Heat] Multiply: 9.6 J = (10. g °C)c[Specific Heat] Isolate c: 0.96 J/g °C = c[Specific Heat] Rewrite: c = 0.96 J/g °CHow many grams is 2.40 x 1023 molecules of N,O,? (5 pts)
PLS HELP ASAP
Answers
Answer:
30.26 grams of N₂O₃
Explanation:
Divide by Avogadro's number. This leaves you with the number of moles. Then, multiply by the molar mass of N₂O₃
Describe the two methods to increase the rate at which a substance dissolves.
Answers
By stirring faster, more of the solute/solvent come in contact faster.
By heating up a substance, the same things happens.
Hope this helps!
What is the percent by mass concentration of 1000 ml of a solution (d=1.5 g/ml) that contains 50 g of solute in it?
Answers
Answer: The percent by mass concentration is 33.3 %
Explanation:
Mass percent is the ratio of mass of solute to the mass of solution in terms of percentage.
mass of solute = 50 g
mass of solution = [tex]{\text {density of solution}}\times {\text {volume of solution}}=1.5g/ml\times 1000ml=1500g[/tex]
Mass percentage = [tex]\frac{50g}{1500g}\times 100\%=33.3\%[/tex]
Thus percent by mass concentration of 1000 ml of a solution (d=1.5 g/ml) that contains 50 g of solute in it is 33.3 %
What event occurs when the
tension built up along Earth's
plates is released causing one
plate to slip past another?
Answers
Answer:
An earthquake
Explanation:
Infer why it is important to add sodium chloride to
water when making homemade ice cream.
Answers
Answer:
the addition of sodium chloride to water effect a lowering of the melting point of water such that the liquid cream or water mixture tends to solidify upon churning when in thermal contact with the mix indigrents
Provide a set of step by step instructions to make 750 mL of 1.5 M calcium chloride solution.
Answers
Answer: PLease see answer in explanation column
Explanation:
FIRST STEP
We find the grams ( mass ) of solute required to prepare the solution by using the formula
grams ( mass ) of solute, g(CaCl2)= Molar mass x Molarity of the solution x Volume of the solution
Therefore Preparing 750 mL of 1.5 M calcium chloride solution, we have that Molar mass of Calcium chloride =110.98 g/mol
g(CaCl2) =110.98 g/mol X 1.5mol/L X 0.75L
g(CaCl2) =124.8525g CaCl2
SECOND STEP
Now Dissolve 124.8525g CaCl2 in about 350ml of distilled water then add more water until the final volume be comes 750ml
Scenario: You are testing two different household solutions with your cabbage indicator, using the color key to the right.
One solution turns blue. A possible hydrogen ion concentration for this solution is: D
1 × 10-2 M
5 × 10-2 M
5 × 10-4 M
1 × 10-8 M
Answers
Answer:
DDDDD
Explanation:
According to the indicator theory, the hydrogen ion concentration for this solution is 1 × 10⁻⁸ M.
What is an indicator?Indicator is defined as a chemical substance which is chemically a weak acid or a weak base which changes it's color depending upon the concentration of hydrogen ions present in the solution.They dissociate slightly in water to produce ions.
These are generally derived from plant pigments and are of slightly acidic or basic in nature.There are three types of indicators:
1) natural indicators
2) synthetic indicators
3) olfactory indicators.
These are mainly used in determination of end point of titrations. Every indicator has it's pH range in which it can perform effectively.These are usually organic compounds.
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