Answer:
19.32
Explanation:
the density is given by the mass over volume
the mass In this case is 342.93 and the volume is 17.75
d=342.93g/17.75cm
=19.32g/cm
i hope this helps
Do plants need soil to grow
Answer:
Not all plants do need soil to grow
Explanation:
Not all plants need soil to grow. Some just do better in soil compared to other growing mediums. What plants need are minerals and nutrients, such as nitrogen, potassium, and phosphorous. Soil is an effective way of delivering those nutrients cost-effectively. You can also use alternative delivery systems like hydroponics, aeroponics, and aquaponics to achieve the desired effect. However, these are only suitable for growing shallow-rooted plants. Plants with deep roots will always need soil, as will larger plants with spreading roots.
best way to separate a solid from a liquid what separation technique is needed
Answer:
Filtiration technique
Explanation:
Help!!!!!!!!!!!!!!!!!!
[tex]\\ \rm\longmapsto 9.7300\times 10^2+9.8700\times 10^3[/tex]
[tex]\\ \rm\longmapsto 9.73\times 10^4+9.87\times 10^3[/tex]
[tex]\\ \rm\longmapsto 19.6\times 10^{4+3}[/tex]
[tex]\\ \rm\longmapsto 19.6\times 10^7[/tex]
Answer:
1.0843 × 10^4
Explanation:
9.7300 × 10^2 + 9.8700 × 10^3
= 10843
1.0843 × 10^4
= 10843
What is an atomic mass unit? Write down the electric charge of proton neutrons and electric.
Answer:
protons has a positive charge.
Neutrons does not have a charge (neutron = neutral)
Electrons has a negative charge
7.95x10 converted to the number is
7.95 × 10
= 79.5
This is the answer
to Separate camphor from sand we use_______process.
Answer:
to Separate camphor from sand we use sublimation process.Hope it is helpful to youwhat is local unit?
.
Answer:
Explanation:
Local unit means a county, city, village, or township.
what is used in conjunction with a scale balance to weigh dry chemicals
Complete and write net ionic equation:
NH3 + HCI->
Answer:
IONIC EQUATION OF NH3 AND HCL IS NH4CL
A graduated cylinder is filled 32.6 ml with water and a piece of granite is placed in the cylinder displacing the level to 40.7 ml what is the volume of the granite piece in cubic centimeters
Answer: 8.1
Explanation:
good luck
plz search rhe chemistry project on any topic..
IF NOT THEN SORRY :)
which property is a physical property
Answer:
a
Explanation:
because it is matter . It has change in molèculaŕ level
A Brønsted-Lowry acid Question 9 options: A) has a lower pH than vinegar. B) is any species that donates a proton. C) is any species that accepts a proton. D) is limited to aqueous solutions.
Answer:
B) is any species that donates a proton.
Answer:
A Brønsted-Lowry acid is any substance (molecule or ion) that can donate a hydrogen ion (H+).
A Brønsted-Lowry base is any species that can accept a hydrogen ion (H+).
Explanation:
In short, acids have the ability to donate protons and bases have the ability to accept protons.
Take the following reaction for example:
H2SO4+NH3⇌NH+4+HSO−4
Sulfuric acid (H2SO4) is the Brønsted-Lowry acid because it donates a hydrogen ion. Ammonia (NH3) is the Brønsted-Lowry base because it accepts the hydrogen ion.
The Brønsted-Lowry theory also introduces the concept of conjugate acid-base pairs. A conjugate acid-base pair are two species that differ by a (H+) ion.
Based on the reaction above, the ammonium ion
(NH+4) is the conjugate acid of the base ammonia and the hydrogen sulfate ion (HSO−4) is the conjugate base of sulfuric acid.
Here's a tip to let you know which substance is the conjugate acid and which substance is the conjugate base:
A conjugate base has one less (H+) proton than the acid you started with.
A conjugate acid has one more (H+) proton than the base you started with.
So option c is correct
Is any spcies that denotes a proton
Explanation:
A scientist wants to know: "If salt is added to water, would the
solution still boil at the same temperature?"
torcses
Answer:
no, the sollution will boil at a higher temperature because the density of the sollution will increase when salt is added to it
Susan said, "if I fertilize my geranium plants, they will blossom"
Choose the correct step in the scientific method
A. recognize a problem
B. from hypothesis
C. test the hypothesis with an experiment
D. draw conclusions
Answer:
This is called a hypothesis, which can be identified by the if... then... format.
So, the correct option is B. Form a hypothesis.
Let me know if this helps!
Answer:
C
Explanation:
Small quantities of spilled acids can be made safe with *
1 point
o gasoline.
alcohol.
water.
sodium bicarbonate solution.
Answer:
sodium bicarbonate solution
Question 3 of 10
How are prefixes used to name compounds?
O A. Prefixes are used to indicate the number of atoms in both
covalent and ionic compounds.
O B. Prefixes are used to tell how many of each kind of atom are in
covalent compounds.
O C. Prefixes are used to tell how many of each kind of atom are in
ionic compounds.
O D. A prefix is used only for the name of the second element in
covalent compounds.
the answer is highly possible to be C
Prefixes are used to indicate the number of atoms in both
covalent and ionic compounds.
Covalent or molecular compounds form when elements share electrons in a covalent bond to form molecules. Molecular compounds are electrically neutral.
Ionic compounds are (usually) formed when a metal reacts with a nonmetal (or a polyatomic ion). Covalent compounds are formed when two nonmetals react with each other. Since hydrogen is a nonmetal, binary compounds containing hydrogen are also usually covalent compounds.
Metal + Nonmetal —> ionic compound (usually)Metal + Polyatomic ion —> ionic compound (usually)Nonmetal + Nonmetal —> covalent compound (usually)Hydrogen + Nonmetal —> covalent compound (usually)Learn more about covalent and ionic compounds.
https://brainly.com/question/20464674
#SPJ2
Which of the following is the correct Lewis structure for methane (CHA)?
O A. H-C-H
H
I-0-I
OB. H-H-C-H-H
0
H
O c. H:C:H
H
OD H-C-H
The correct lewis structure of methane(CH4)
C. H:C:H:H
Write two reactions showing nascent Hydrogen is more reactive than
molecular Hydrogen.
Answer:
1.) Nascent Hydrogen has more energy than Molecular Hydrogen.
2.) Nascent Hydrogen is are more on the side of atomic and since atoms are more active than molecules, Nascent Hydrogen becomes more reactive.
Experts believe that a good night sleep is vital to a success in school. Would kids that sleep 8 or
more hours a night get better grades than kids who sleep less than 7 hours a night?
Make a hyphotesis
Answer:
kids who sleep 8 or more hours a night
Explanation:
I hypothesize that kids who sleep 8 plus hours a night because your brain needs a good night's sleep to regenerate .
A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?
- Molecules in both the metal and the surrounding air will start moving at lower speeds.
-Molecules in both the metal and the surrounding air will start moving at higher speeds.
-The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up.
-The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Answer:
it will dilute to its natrual state. so c
Explanation:
What does the prefix trans-indicate?
A. There are at least two double bonds in the molecule.
B. The carbons on either side of the double bond are pointed in
opposite directions.
C. The molecule is an alkane with no double bonds.
O D. The carbons on either side of the double bond are pointed in the
same direction
Answer:
B. The carbons on either side of the double bond are Pointed in opposite directions
what's the atomic weight of salt ?
Answer:
58.44 g/mol
Explanation:
58.44 g/mol
How is polyethene formed?
A. None of these
B. The double bond on reactive ethene molecules breaks allowing them to bond with each other and form a chain.
C. Double bonds are very strong. This means when ethene is heated, hydrogens will be removed before the double bonds break. When ethene molecules lose hydrogens, their carbons bond with each other forming branching chains.
D. Polyethene is formed by the formation of double bonds between carbons in ethane molecules.
Answer:
c
Explanation:
because 2× is strong. hydrogen will be remove
How many grams of liquid water are produced when 60 grams of ice melt?
Answer: 60 Grams of water are produced, because you can't get more than the amount that was in the original ice cube
Explanation:
What are the standard temperature and pressure conditions enthalpy is usually measured under
Answer:
temperature must be 273 Kelvin (0°C)
pressure must be 1 atm
which of the following two conditions will favor a spontaneous reaction?
a) an increase in entropy and a decrease in enthalpy
b) an increase in both entropy and in enthalpy
c) a decrease in entropy and a decrease in enthalpy
d) a decrease in entropy and an increase in enthalpy
Two metals with equal mass will absorb heat according to their heat absorbing capacity.
The increase in entropy will cause the solid substance to break into multiple pieces.
When these solute particles detach from each other they will form a solution. Entropy increase will cause the temperature to increase.
Decrease in enthalpy is an exothermic reaction which releases heat from the reaction and then desired products will be formed.
Learn more at https://brainly.com/question/24376442
why metals are not often used to
make clothes
Answer:
They would be to heavy and you would be really stiff
Explanation:
Imagine walking in a suit made of iron or tin
You would feel like the Tin Man
You would be stiff
Metals are hard and heavy
Question 2 of 10
How might the government make sure scientific research is done in an ethical
way?
A. By encouraging scientists to perform within their own ideas of
right and wrong
B. By letting public opinion determine what is ethical in scientific
research
C. By allowing scientists to do what they think is best
D. By taking away research funds if certain ethical standards are not
met
Answer:
C I think. If I am wrong please correct me.
Explanation:
Two graduated cylinders, one filled with water to 20 millimeters and one containing a rock and water filled to 32 millimeters.
Use the image to determine the volume of the rock.
Initial volume:
mL
Final volume:
mL
Volume of rock:
cm3
Answer:
1. 20
2. 32
3. 12
Explanation:
