Answer:
false
Explanation:
soft surfaces absorb sound. :)
Answer:
FALSE
FALSE FALSE FALSE FALSE FALSE
Explanation:
Which end of the H-F molecule will be partially positive?
neither end
the fluorine end
both ends
the hydrogen end
Answer:
the hydrogen end
Explanation:
In H - F molecules there is a charge separation. Hydrogen has partial positive charge on them and Fluorine has a partial negative charge on it.
The bonds between H - F molecule is a covalent bond. In this bond, both atoms share their electrons to attain a stable configuration But the electrons are not shared equally. Fluorine is more electronegative compared to the hydrogen. Fluorine therefore, attracts the shared electrons more closely to itself. This makes fluorine more negative and hydrogen positive.What Is the atomic mass of the element shown? 14 Si silicon 28.1
A. 56
B. 14
C. 42.1
D. 28.1
Answer:
28.1
Explanation:
plez give me brainliest
I have 1.8066 x 1024 atoms of Calcium, how many grams of calcium do I have?
Answer: 1849.9584
Explanation:
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
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.
Learn more about covalent compounds here:
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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
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:
What characteristic do atoms in the same group of elements share?
1 - they have the same number
2 - they have similar physical property
3 - they have the same atomic mass
4 - the same number of electrons orbitals
Answer:
2 option
Explanation:
please mark me brainliest and 5 star
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.
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:
Label each of the following properties of sulfur as either á physical or chemical property.
Use the definition of a physical property and chemical property to back up your answer.
1. It reacts with hydrogen when heated
2. It is a yellow solid at room temperature
3. It is soluble in carbon disulfide
4. Its density is 2.97 g/cm3
5. It melts at 113°C
Answer:
Explanation:
1. It reacts with hydrogen when heated
Chemical property
2. It is a yellow solid at room temperature
Physical property
3. It is soluble in carbon disulfide
Chemical property
4. Its density is 2.97 g/cm3
Physical property
5. It melts at 113°C
Physical property
Physical properties tells us everything about what substance is when no change is occurring to its constituents.
It can be observed using apparatus and instruments. Examples are state of matter, color, odor, taste, texture, hardness, solubility in water, density, melting point and boiling point
Chemical properties are those properties that tell us about what a substance can do as regards to whether or not the substance reacts with other substances. Examples are flammability, rusting of irons, precipitation, decomposition of water by an electric current.
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."
To know more about activity series and metals
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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)
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
Which best describes electromagnetic waves moving from gamma rays to radio waves along the electromagnetic
spectrum?
A) Wavelength and frequency decrease.
B) Wavelength and frequency increase.
C) Wavelength increases, and frequency decreases.
D) Wavelength decreases, and frequency increases.
Answer:
Wavelength increases, and frequency decreases.
for my lazy friends its letter C
Explanation:
e2021
The statement 'wavelength increases and frequency decreases' best describes electromagnetic waves moving from gamma rays to radio waves (option C).
What is wavelength?The term wavelength makes reference to the distance between the picks of the waves in the electromagnetic spectrum.
The wavelength and frequency can be used to understand the dynamics of electromagnetic waves.The frequency of a wave refers to the period of oscillation within an electromagnetic spectrum.In conclusion, the statement 'wavelength increases and frequency decreases' best describes electromagnetic waves moving from gamma rays to radio waves (option C).
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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:
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
A strand of DNA has the following order of bases: CGTATGCA. What is the matching ( complimentary) strand
Answer:
GCATACGT
Explanation:
A=T
G=C
C=G
T=A
This key goes with any complementary DNA strand.
Hope this helps you out!
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
What is the best method of eye protection in laboratory?
Answer:
goggles
Explanation:
...................
Which substance in the table below will heat up the fastest? water helium diamond or glass
Answer:
Helium will heat up the fastest
Explanation:
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
When 3.5 moles of sodium oxide react, how many moles of sodium hydroxide will be produced?
moles NaOH *Report your answer to the
correct number of significant digits!
Na2O + H2O -> 2 NaOH
Answer:
7 moles of NaOH will produced.
Explanation:
Given data:
Number of moles of sodium oxide = 3.5 mol
Number of moles of sodium hydroxide produced = ?
Solution:
Chemical equation:
Na₂O + H₂O → 2NaOH
Now we will compare the moles of sodium oxide with sodium hydroxide.
Na₂O : NaOH
1 : 2
3.5 : 2/1×3.5 = 7
7 moles of NaOH will produced.
Can someone help me out with this thanks!
Answer:
a) Hydrogen and Fluorine
b) Lithium and Oxygen
c) Potassium and Phosphorus
d) Nickel and Oxygen
e) Mercury and Chlorine
Explanation:
The capital letters in the compounds represent a single element, while some elements have one capital letter and one small letter after it.
a) H & F
b) Li & O
c) K & P
d) Ni & O
e) Hg & Cl
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.
Argue the importance of chemistry to the field of materials science.
(short answer)
Explanation:
Chemistry, however, plays the primary role in materials science because it provides information about the structure and composition of materials. Materials scientists study the structures and chemical properties of various materials to develop new products or enhance existing ones.
Answer:
the other person is right.
Explanation:
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]
What is the main product of cellular
respiration?
Answer:
The main products are ATP, carbon dioxide, and water.