what conditions does bacteria need to grow in yogurt?
Laura sees a horse pulling a buggy.
Which statement best describes the forces acting on the horse and buggy?
The net forces exerted on the horse and cart are the same, but the action force is larger.
The net forces exerted on the horse and cart are the same, but they are in the same direction.
The net forces exerted on the horse and cart are not the same, so the two forces cancel out.
The net forces exerted on the horse and cart are not the same, so they are not balanced forces.
Answer:
B
Explanation:
I think that the anserw is B.
An atom that gains electrons is called a(n) _________.
A. isotope
B. magnet
C. None of these
D. negative ion
negative ion or anion
hope it helps...!!!
Answer:
C. None of these
Explanation:
Use the molar volume to calculate the number of moles of CO2 in 4.00L of CO2 gas at STP.
The number of moles will be 0.178 moles. It can be calculated by ideal gas law.
What is ideal gas law?The ideal gas law gave the relationship between pressure, volume as well as temperature. It can be expressed as:
PV =nRT
Where, P is pressure, V is volume and T is temperature.
Calculation of number of moles by using ideal gas law.
Put the value of given data in above ideal gas law formula.
n = PV / RT
n = (1 atom × 4 L)/ (0.0821 × 273 K
n = 0.178 moles.
Therefore, the number of moles will be 0.178 moles.
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The picture compound has which Bond
hard water contains calcium and magnesium ions. one way to soften water is to add sodium phosphate. Write complete and net ionic equations for the reaction of these two alkaline earth metals with aqueous sodium phosphate
Explanation:
The photo is the net ionic equation for the Calcium ions
The net ionic equation for the reaction is [tex]3Ca^{+2} + 2PO^{-3}_2----- > Ca_3(PO_4)_2[/tex]
What is chemical reaction?A chemical reaction is the chemical transformation of one set of chemical substances into another.
When chemical bonds between the atoms are formed or broken, chemical reactions occur.
The substances that initiate a chemical reaction are known as reactants, and the substances that result from the reaction are known as products.
Plants grow, start producing fruit, and decompose to become compost for new plants through chemical reactions.
The reaction for the given scenario is,
[tex]3Ca^{+2} + 2PO^{-3}_2----- > Ca_3(PO_4)_2[/tex]
Thus, above mentioned is the chemical reaction.
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What is the volume of 1.758 mole of a gas at standard temperature and pressure
Answer:
39.379 liters
Explanation:
One mole of gas at STP = 22.4 l / mole
22.4 l/mole * 1.758 mole = 39.379 liters
.
A species is a group of organisms that closely resemble each other in physical appearance and behavior and can mate and produce young that can also mate and produce young. True or false?
false
true
Answer:
True
Explanation:
It's a true statement
Answer:
True
Explanation:
A species is a group of similar organisms that can breed with one another to produce fertile offspring. For example, humans are one species and dogs are another species. Individuals of the same species can reproduce to make more individuals of the same species.
.
...............................
Answer:
F is correct
Explanation:
When an atom or group of atoms" has more protons than electrons",it is positively charged. An atom or group of atoms that has the same number of protons and electrons is neutrally charged.
Answer: If an object that has an excess of positive electrons it is a positively charged object.
Determine the mass of the following samples
3 moles of Mg
4.2 moles of NaCI
Answer:
See below
Explanation:
From periodic chart
Mg = 24.305 gm per mole
24.305 * 3 = 72.915 gm
Na = 22.989
Cl = 35.45 summed = 58.439 gm per mole
58.439 * 4.2 = 245.4438 gm
What do these 2 changes have in common?
Both are only physical changes.
Both are caused by heating.
Both are chemical changes.
Both are caused by cooling.
Answer:
Both are caused by heating. Both are Chemical changes.
Explanation:
Water evaporates from the Sun's heat and is transformed into a gas. Sediment is the particles of an object. When heat hits it, it starts breaking up, or in dry cases, heating and cracking.
what is this difference between a Mm and a mm? which is larger one Mm or one mm
12)
What are the products of photosynthesis?
A)
glucose and oxygen
B)
carbon dioxide and water
C)
carbon dioxide and oxygen
D)
glucose and carbon dioxide
the forces that keep liquid particles together are called _____ forces of attraction
Answer:
The forces that keep liquid particles together are called intermolecular forces of attraction.
Which of the following is an ionic compound?
A. N2O B. CO C. HCL D. Na2O
Answer:
D. Na2O
Because we already know that sodium oxide is a binary ionic compound because it contains one metal cation and one non-metal anion.
Answer:
D. Na2O
Explanation:
Sodium oxide (Na2O) is an ionic compound. Its constituent atoms are, respectively, a metal and a non-metal.
Sodium (Na), as a metal, will attempt to lose electrons to reach an octet state. Oxygen (O2), as a non-metal, will attempt to gain electrons to reach an octet state.
:-befrank
Calculate the grams of C6H6 needed to produce 25 g of CO2
Show your work
Answer:
The given reaction is a combustion reaction of benzene,
C
6
H
6
. From its balanced chemical equation,
2
C
6
H
6
+
15
O
2
→
12
C
O
2
+
6
H
2
O
,
the mass of carbon dioxide
(
C
O
2
)
produced from 20 grams (g) of
C
6
H
6
is determined through the molar mass of the two compounds, given by,
M
M
C
O
2
=
44.01
g
/
m
o
l
M
M
C
6
H
6
=
78.11
g
/
m
o
l
and their mole ratio:
12
m
o
l
C
O
2
2
m
o
l
C
6
H
6
→
6
m
o
l
C
O
2
1
m
o
l
C
6
H
6
With this,
m
a
s
s
o
f
C
O
2
=
(
20
g
C
6
H
6
)
(
1
m
o
l
C
6
H
6
78.11
g
C
6
H
6
)
(
6
m
o
l
C
O
2
1
m
o
l
C
6
H
6
)
(
44.01
g
C
O
2
1
m
o
l
C
O
2
)
=
(
20
)
(
6
)
(
44.01
)
g
C
O
2
78.11
=
5281.2
g
C
O
2
78.11
m
a
s
s
o
f
C
O
2
=
67.6
g
C
O
2
Therefore, the mass in grams of
C
O
2
formed from 20 grams of
C
6
H
6
is
67.6
g
C
O
2
.
it is a problem of app
The grams of C₆H₆ needed to produce 25 g of CO₂ are 7.38g.
What is Mole concept?Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.
Given,
Mass of CO₂ = 25g
2C₆H₆ + 15O₂ → 12CO₂ + 6H₂O
As per reaction, 156g of C₆H₆ gives - 528g of CO₂
0.295g of C₆H₆ gives - 1g of CO₂
0.295 × 25 g of C₆H₆ gives - 25g of CO₂ = 7.38g C₆H₆
Therefore, The grams of C₆H₆ needed to produce 25 g of CO₂ are 7.38g.
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how does the melting point of a substance indicate the strength of its intermolecular force of attraction
Answer:
The molecules are held together by intermolecular force of attraction. More the force the fusion takes after some time only that means the melting point is high. So molecules with greater molecular forces have high melting point and less molecular forces have low melting point.
Answer:
On heating a solid, the kinetic energy of the particle increases. The particle start vibrating with greater speed. The energy supplies by heat overcomes the force of attraction between the particles.
If this force of attraction is more, then more heat energy will be necessary to overcome this force. So, the melting point of the solid will be higher.
Example 2- If a weather balloon initially has a volume of 25000mL, but then rises up in the air and its new
pressure is 5atm, and its new volume is 15L, what was its initial pressure?
pressure
Binder
Answer:
3 ATM = INITIAL PRESSURE
Explanation:
P1V1 = P2V2
P1 * 25 = 5 * 15
P1 = 3 ATM
what would you expect to happen if you put a red blood cell in a glass pure water distilled water g
Write a net ionic equation for the reaction that occurs when magnesium carbonate (s) and excess hydrochloric acid (aq) are combined.
Answer:
2HBr(aq) + MgS(s) → MgBr2(aq) + H2S(g)
excess
Sulfide ion in solution exists as HS-. Adding additional H+ forces it to H2S gas.
H2S(g) <=> H+(aq) + HS-(aq)
A complete ionic equation also contains the spectator ions, whereas a net ionic equation just displays the chemical species that are involved in a reaction. when MgCO₃ (s) and excess HCl (aq) are combined, the equation becomes MgCO₃ (s) + 2H⁺ (aq) → Mg²⁺ (aq) + H₂O (l) + CO₂ (g).
The chemical species that change chemically are identified by the net ionic equation. The ions that show up on both sides of the equation are stable and are therefore referred to be spectator ions.
Spectator ions are ions that are present on both sides of chemical reactions but do not take part in the reaction itself. The spectator ions on both sides of the equation are canceled in the net chemical reaction.
The complete ionic equation is:
MgCO₃ (s) + 2H⁺ (aq) + 2Cl⁻ (aq) → Mg²⁺ (aq) + 2Cl⁻ (aq) + H₂O (l) + CO₂ (g)
The net ionic equation is:
MgCO₃ (s) + 2H⁺ (aq) → Mg²⁺ (aq) + H₂O (l) + CO₂ (g)
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Between 1988 and 2019, the pH of the ocean hasQuestion 2 options:
decreased by 0.5 pH units.
decreased by 20 pH units.
increased by 0.25 pH units.
decreased by 0.05 pH units.
Answer:
Below
Explanation:
The ocean is becoming more acid, which means the pH is decreasing. In that time frame it has decreased by about 0.05
3.Using Balanced Equations: C5H12+802–5CO2+6H20
A. If you have 358.4 Liters of O2 gas then what's the volume of CO2
b. If you have 360 grams of C5H12 then what's the mass of H2O
Answer:
i think b is the answer hope this helps:))
What is h+ concentrate in a solution with a pH of 1.25 round to nearest hundredth
Answer:
0.0562
Explanation:
Ph=-log[H+]
to find the h+ is the antilogarithm of the Ph.
Which is 10 raised to the power - Ph.
Answer:
5.62
-2
Explanation:
What is the H+ concentration in a solution with a pH of 1.25? Round to the nearest hundredth.
5.62 × 10n M n= -2
How many particles are there in 3 moles of Ag?
Answer:
6.022×1023 individual items of that something. You have 3 moles, so there are 3×6.022×1023 oxygen molecules
Explanation:
6.022×1023 individual items of that something. You have 3 moles, so there are 3×6.022×1023 oxygen molecules
Based on the following data, what is the I-I bond energy?
[tex]\frac{1}{2}[/tex]H2(g) + [tex]\frac{1}{2}[/tex]I2(g) → HI(g); ΔH = 26.36 kJ
Bond Bond Energy (kJ/mol)
H-H 435
H-I 295
A) 208 kJ/mol
B) 155 kJ/mol
C) 365 kJ/mol
D) -208 kJ/mol
E) -155 kJ/mol
Answer:
please you left that of I2 gas
What happens to a positively charged ion during a chemical change?
Answer:
Positively charged ions move to the negative electrode during electrolysis
Explanation:
Electrolysis is the process by which electric current is passed through a substance to effect a chemical change
I hope I was able to help
6. How many moles of water would require 92.048 kJ of heat to raise its temperature from 34.0 °C to 100.0 °C? (3 marks)
Taking into account the definition of calorimetry, 0.0185 moles of water are required.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
Mass of water requiredIn this case, you know:
Heat= 92.048 kJMass of water = ?Initial temperature of water= 34 ºCFinal temperature of water= 100 ºCSpecific heat of water = 4.186 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
92.048 kJ = 4.186 [tex]\frac{J}{gC}[/tex]× m× (100 °C -34 °C)
92.048 kJ = 4.186 [tex]\frac{J}{gC}[/tex]× m× 66 °C
m= 92.048 kJ ÷ (4.186 [tex]\frac{J}{gC}[/tex]× 66 °C)
m= 0.333 grams
Moles of water requiredBeing the molar mass of water 18 [tex]\frac{g}{mole}[/tex], that is, the amount of mass that a substance contains in one mole, the moles of water required can be calculated as:
[tex]amount of moles=0.333 gramsx\frac{1 mole}{18 grams}[/tex]
amount of moles= 0.0185 moles
Finally, 0.0185 moles of water are required.
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Write the full electron configuration for phosphorus, atomic symbol P
Answer:
The electronic configuration for Phosphorus(P) is 1s2,2s2 2p6, 3s2 3p3
use the equation:
2C6H6 + 1502 →12CO2 + 6H20
Calculate the number of moles of oxygen required to react with 5.00 moles of C6H6.
Show steps
Answer:
37.5 moles of O2 needed
Explanation:
2 moles of C6H6 need 15 moles of O2
5/2 * 15 = 37.5 of O2 needed
_______________________ yield is another name for actual yield
The second name that can be used to describe actual yield is Theoretical yield is another name for the actual yield
What is actual YieldThe actual yield is the amount of product obtained from a chemical reaction and it is lesser or equal to the theoretical yield ( the amount of product that can be obtained from a reaction when all reactants are converted ).
Hence we can conclude that theoretical yield is another name for the actual yield.
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