Answer:
cotyledons
Explanation:
A vascular plant that produces flowers, reproduces with seeds, and has two cotyledons is known as a Eudicot. Examples include dandelions and violets. They make up two-thirds of all flowering plants.
Explanation:A plant that is vascular, produces flowers, reproduces with seeds, and has two cotyledons belongs to the Eudicots, also known as true dicots. Examples of these plants include dandelions or violets. They possess vascular tissue that forms a ring in the stem and their flower parts come in four, five, or many whorls. Seed plants, like eudicots, are further divided into those that produce seeds in cones and those that produce seeds in the ovaries of flowers.
Additionally, eudicot plants have two cotyledons, and the veins form a network in their leaves. Their root system is generally characterized by one main root that develops from the embryonic radicle. Eudicots constitute about two-thirds of all flowering plants which also makes them a significant part of the angiosperms - a division of plants that emerged about 160 million years ago.
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What type of isomerism is shown by alkanes
Answer:
Alkanes with more than 3 carbons can show constitutional isomerism. They can be either linear or branched structures. This is categorized as chain isomerism. Butane is the smallest alkane to show such isomerism with 2 isomers.Alkanes with more than 3 carbons can show constitutional isomerism. They can be either linear or branched structures. This is categorized as chain isomerism. Butane is the smallest alkane to show such isomerism with 2 isomers.
Explanation:
Final answer:
Alkanes exhibit structural isomerism, including branched-chain isomerism, where the same molecular formula has different structural arrangements. Alkenes can show structural as well as geometric isomerism due to the rigidity of the double bond.
Explanation:
Isomerism in Alkanes
The type of isomerism shown by alkanes is called structural isomerism, specifically branched-chain isomerism. This occurs when alkanes with the same molecular formula have different arrangements of carbon atoms. For example, butane (C4H10) can exist as a straight-chain alkane or it can have a branched-chain structure, resulting in isomers with different physical properties.
Branched-chain alkanes and straight-chain alkanes are isomers because they have the same molecular formula but different structural formulas, leading to different physical properties. In contrast, alkenes can exhibit structural isomerism as well as geometric isomerism, also known as cis-trans isomerism, which occurs due to restricted rotation around the double bond.
While alkanes only show structural isomerism such as straight-chain and branched-chain structures, alkenes can show both structural and geometric isomerism, where the spatial orientation of groups attached to the double bond leads to distinct isomers. This rigidity of the double bond in alkenes influences their chemical reactivity and physical properties.
what does calibrating the cabbage pH indicator mean
Answer:
Calibrating the cabbage pH indicator means creating a color key based on solutions that have known pH values.
Explanation:
Answer: 1st a
2nd b, d
3rd a
Explanation:
The mass of an electron is
A. equal to the proton mass plus the neutron mass
B. the smallest of the three major particles
C. the same as the mass of the proton
D. the same as the mass of the atom
Answer:
B
Explanation:
technically an electron has a very negligible mass
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Name three things you know about angiosperms
Answer:
Angiosperms are further classified as monocotyledonous and dicotyledonous plants. Cotyledons are the first leaves – the seed leaves – that a plant grows upon germination. The female reproductive organs of an angiosperm are the stigma, style and the ovary which are collectively known as the carpel.
Explanation:
What is the molar mass of sodium carbonate (Na2CO3)?
Answer:
105.9888 g/mol
Explanation:
The molar mass of sodium carbonate is 105.9888 g/mol (grams per mole)
For the formation of ammonia, NH3, the enthalpy of reaction is shown:
3H2(g) + N2(g) --> 2NH3(8)
AH = -45.9 kJ
How much energy is required to convert ammonia back to hydrogen and nitrogen?
Answer: The amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ
Explanation:
Endothermic reactions are defined as the reactions in which energy is absorbed in the reaction. The enthalpy change of the reaction is positive.
Exothermic reactions are defined as the reactions in which energy is released in the reaction. The enthalpy change of the reaction is negative.
For the given chemical equation:
[tex]3H_2(g)+N_2(g)\rightarrow 2NH_3(g);\Delta H=-45.9kJ[/tex]
In the above reaction, the enthalpy change is negative. So, the reaction is exothermic in nature.
For the reverse reaction, the magnitude of the enthalpy change remains the same but sign for it changes.
Hence, the amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ
A student must use 225 g of hot water in a lab procedure. Calculate the amount of heat in joules required to raise the temperature of 225 g of water from 20.0 °C to 100.0 °C. (Water’s specific heat capacity is 4.184 J/g°C) (round answer to 2-3 sig figs)
Answer:
Q = 75.312 KJ
Explanation:
Heat is the amount of the thermal energy contained in an object measured in joules. When heat energy is transferred to an object, the temperature of the object changes depending on the amount of heat applied and the type of object.
Given that:
mass of water (m) = 225 g, Temperature difference ([tex]\Delta T[/tex]) = 100°C - 20°C = 80°C, Water’s specific heat capacity ([tex]c_p[/tex]) = 4.184 J/g°C
The quantity of heat (Q) is given as:
[tex]Q=mc_p\Delta T[/tex]
[tex]Q= 225g *4.184J/g^0C*80=75312J=75.312KJ[/tex]
The amount of heat in joules required to raise the temperature of 225 g of water from 20.0 °C to 100 °C is calculated using the heat equation q=mcΔT. After substituting appropriate values, we get the result as 75.3 kJ.
Explanation:To calculate the amount of heat required to raise the temperature of 225 g of water from 20.0 °C to 100 °C, we can use the heat equation q = mcΔT where 'm' is the mass of the water, 'c' is the specific heat capacity of water, and 'ΔT' is the change in temperature.
Here, m = 225 g (the mass of the water), c = 4.184 J/g °C (the specific heat capacity of water), and ΔT = 100 °C - 20 °C = 80 °C (the change in temperature).
Hence, q = mcΔT = (225 g) × (4.184 J/g °C) × (80 °C) = 75312 J or 75.3 kJ after rounding to 3 significant figures. Hence, the amount of heat in joules required to raise the temperature of 225 g of water from 20.0 °C to 100 °C is 75.3 kJ.
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What type of substance would be best for use in a cooling system?
a gas with a low specific heat
a liquid with a high specific heat
a solid with a high specific heat
a liquid with a low specific heat
Answer:
Liquid with a specific high heat
Explanation:
The type of substance would be best for use in a cooling system would be a liquid with a high specific heat and the correct option is option B.
What is Specific heat?
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.
The units of specific heat are usually calories or joules per gram per Celsius degree. For example, the specific heat of water is 1 calorie (or 4.186 joules) per gram per Celsius degree.
This property of water in our body to maintain constant body temperature.
Therefore, The type of substance would be best for use in a cooling system would be a liquid with a high specific heat and the correct option is option B.
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How does water move during the water cycle?
A.
Water moves in a continuous cycle from the surface of the Earth, through the crust, oceans, and atmosphere.
B.
Water moves through a non-repeating cycle from the surface of the Earth, through the crust, oceans, and atmosphere.
C.
Water moves in a continuous cycle from the oceans to beneath the Earth's surface only.
D.
Water moves through a non-repeating cycle from the oceans to beneath the Earth's surface only.
Answer:
A.Water moves in a continuous cycle from the surface of the Earth, through the crust, oceans, and atmosphere.
Thank You.
☆ ★ Make It Brainlist Answer....Coconut oil is commonly used as a fuel. Palmitic acid is the primary ingredient that produces the heat. Balance the combustion reactions for palmitic acid.
C16H32O2 + O2 → CO2 + H2O
Answer:
The answer is C16H32O2 + 23 O2 ---> 16CO2 + 16H2O
Explanation:
Answer:
blank, 23, 16 , 16
Explanation:
look at my ss
Pleassssdseee help meee
Which of the following gases diffuse more slowly than oxygen? F2, Ne, N2O, C2H2, NO, Cl2, H2S
Answer:
Cl2, N2O, F2, H2S
Explanation:
You must recall Graham's law at this point. Graham's law states that the rate of diffusion of a gas is inversely proportional to the square root of its vapour density or molar mass.
Now, the greater the molar mass of a gas, the lesser the rate of diffusion of that gas. The gas that will diffuse more slowly than oxygen must have a higher molar mass than oxygen. Oxygen has a molar mass of 32gmol-1, let us look at the molar masses of other gases.
F2= 37.99681 g/mol
Ne= 20.1797 gmol-1
N2O= 44.013 g/mol
C2H2= 26.04 g/mol
NO= 30.01 g/mol
Cl2= 70.906 gmol-1
H2S= 34.1 g/mol
Hence in order of decreasing slower diffusion than oxygen gas
Cl2, N2O, F2, H2S
Neon, Nitrous Oxide, and Hydrogen Sulfide diffuse more slowly than oxygen.
Explanation:Oxygen (O2) is a diatomic gas that diffuses relatively quickly. Among the given gases, Neon (Ne), Nitrous Oxide (N2O), and Hydrogen Sulfide (H2S) diffuse more slowly than oxygen. Neon is a monatomic gas with a larger atomic mass, which affects its diffusion rate. Nitrous Oxide is a larger, more complex molecule, and Hydrogen Sulfide has a hydrogen bond, both of which slow down their diffusion rates compared to oxygen.
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A chemist must dilute 34.3mL of 1.72mM aqueous calcium sulfate solution until the concentration falls to 1.00mM. He'll do this by adding distilled water to the solution until it reaches a certain final volume.
Calculate this final volume, in milliliters. Round your answer to 3 significant digits.
To dilute the calcium sulfate solution, use the dilution formula to calculate the final volume, which is approximately 58.7mL.
Explanation:To dilute the 1.72mM aqueous calcium sulfate solution to 1.00mM, we can use the dilution formula:
C1V1 = C2V2
Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume. Rearranging the formula, we have:
V2 = (C1V1) / C2
Plugging in the values: C1 = 1.72mM, V1 = 34.3mL, C2 = 1.00mM, we can calculate the final volume:
V2 = (1.72mM * 34.3mL) / 1.00mM = 58.732mL
Rounding to 3 significant digits, the final volume is approximately 58.7mL.
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If you're good with covalent bonds please help.
Answer:
[tex]SiS_2[/tex]: Silicon disulfide
[tex]NBr_3[/tex]: Nitrogen tribromide
[tex]N_2Cl_4[/tex]: Dinitrogen tetrachloride
Explanation:
Whenever you have an binary compound such as this, you can look at the individual elements for the name. The first word will simply be the prefix + the name of the element.
*** Notice you don't need to put a prefix if theres only 1. This is understood as mono. Only on the first word.
For the second word, its simply the root + ide.
A platinum bar measures 5.0 cm long and 4.0 cm wide and 1.5 cm thick. It has a mass of 700.0 g calculate the mass of the platinum bar?
The mass of the platinum bar is approximately 699.9 grams.
To calculate the mass of the platinum bar, we can use its volume and density.
Given:
- Length (l) = 5.0 cm
- Width (w) = 4.0 cm
- Thickness (h) = 1.5 cm
- Mass (m) = 700.0 g
First, let's calculate the volume of the platinum bar using the formula for the volume of a rectangular prism:
[tex]\[ \text{Volume} = l \times w \times h \\\[ \text{Volume} = 5.0 \, \text{cm} \times 4.0 \, \text{cm} \times 1.5 \, \text{cm} \\\[ \text{Volume} = 30.0 \, \text{cm}^3 \][/tex]
Now, we can use the density formula to find the mass:
[tex]\[ \text{Density} = \frac{\text{Mass}}{\text{Volume}} \\\[ \text{Density} = \frac{700.0 \, \text{g}}{30.0 \, \text{cm}^3} \\\[ \text{Density} \approx 23.33 \, \text{g/cm}^3 \][/tex]
Now that we have the density of platinum, we can calculate the mass of the bar:
[tex]\[ \text{Mass} = \text{Density} \times \text{Volume} \\\[ \text{Mass} = 23.33 \, \text{g/cm}^3 \times 30.0 \, \text{cm}^3 \\\[ \text{Mass} \approx 699.9 \, \text{g} \][/tex]
So, the mass of the platinum bar is approximately 699.9 grams.
2.00 moles of an ideal gas was found to occupy a volume of 17.4L at a pressure of 3.00 atm and at a temperature of 45 C. Calulate the value of the cas constant R in
Answer:
[tex]0.082 atm L mol^{-1} K^{-1}[/tex]
Explanation:
The pressure, the volume and the temperature of an ideal gas are related to each other by the equation of state:
[tex]pV=nRT[/tex]
where
p is the pressure of the gas
V is the volume of the gas
n is the number of moles
R is the gas constant
T is the absolute temperature
For the gas in this problem:
n = 2.00 mol is the number of moles
V = 17.4 L is the gas volume
p = 3.00 atm is the gas pressure
[tex]T=45C+273=318 K[/tex] is the absolute temperature
Solving for R, we find the gas constant:
[tex]R=\frac{pV}{nT}=\frac{(3.00)(17.4)}{(2.00)(318)}=0.082 atm L mol^{-1} K^{-1}[/tex]
most radioactive place on earth
Answer: Ramsar, Iran (happy to help)
Explanation:
Rocks, as they are compressed, begin forming mountains above the Earth's surface when two continental plates converge.
The continental crust increases in depth as the mountains grow above. The Himalayan Mountains formed at a convergent
plate boundary in this manner. The rocks are smashed together causing them to
due to the intense heat and
pressure from the colliding plates and eventually forming
rock.
melt; igneous
layer; sedimentary
recrystallize; metamorphic
melt into the Earth's interior; metamorphic
Final answer:
Continental plates colliding under intense pressure and heat cause existing rocks to recrystallize into metamorphic rocks, contributing to the formation of mountain ranges such as the Himalayas.
Explanation:
When two continental plates converge, the intense pressure and heat they generate cause the existing rocks at the plate boundary to recrystallize, forming metamorphic rocks. This process, often associated with mountain building, is evident in the formation of the Himalayan Mountains at such a convergent plate boundary. Between colliding continental masses, like the African plate and the Eurasian plate forming the Alps, or the Asian and Arabian plates creating the Zagros Mountains, the pressure and heat metamorphose the rocks in the mountain chains. The creation and the shaping of these mountains are not solely due to tectonic forces but are also significantly affected by volcanic activity and erosion by elements like water and ice over time.
5.00 L of a gas is collected at 100K and then allowed to expand to 20.0 L. What must the new temperature
be in order to maintain the same pressure?
A. 400 °C
B. 127 °C
C. 223 °C
D. 627°C
Answer: Option B) 127 °C
Explanation:
Initial volume of gas V1 = 5.00 L
Initial temperature of gas T1 = 100K
New volume of gas V2 = 20.0 L
new temperature of gas T2 = ?
Since volume and temperature are involved while pressure is constant, apply the formula for Charles law
V1/T1 = V2/T2
5.00 L/100K = 20.0 L/T2
cross multiply
5.00 x T2 = 100 x 20.0
5.00T2= 2000
T2 = 2000/5.00
T2 = 400K
Convert temperature in Kelvin to Celsius
(400K - 273) = 127°C
Thus, the new temperature of the gas is 127°C
What’s earths relation to the sun during June solstice and December solstice
During the June solstice, the Northern Hemisphere is tilted towards the Sun resulting in longer days; vice versa for the December solstice when the Southern Hemisphere experiences summer.
During the June solstice, which occurs around June 21, the Earth's Northern Hemisphere is tilted toward the Sun.
This results in the North Pole experiencing 24 hours of daylight, while the Sun's rays are directly over the Tropic of Cancer.Conversely, during the December solstice, around December 21, the Northern Hemisphere tilts away from the Sun, causing shorter days and longer nights.
At this time, the Southern Hemisphere enjoys summer as it leans into the Sun, with the Sun's rays hitting directly over the Tropic of Capricorn. The South Pole experiences 24 hours of daylight.June Solstice: Northern Hemisphere tilted towards the Sun, maximum sunlight at the Tropic of Cancer.
December Solstice: Northern Hemisphere tilted away from the Sun, maximum sunlight at the Tropic of Capricorn.
An electric current can be best conducted by
Answer:
a metal
Explanation:
metals are good conductors of electricity.
hi:) are electrostatic forces ionic bonding? I’m kinda confused :/
Answer:
Yes indeed BRUVA!!!! Electrostatic is a term used to describe the charges of the ionic compound
Which goes with this phase days after the rainstorm the playground is now dry
1. What is the difference between charging by conduction and charging by induction?
A- During induction, charges move between objects that briefly touch; during conduction, charges move between objects that are rubbed together.
B- During conduction, charges move between objects that briefly touch; during induction, charges move between objects that are rubbed together.
C- During induction, charges move between touching objects; during conduction, charges are redistributed within an object that is near another object.
D- During conduction, charges move between touching objects; during induction, charges are redistributed within an object that is near another object.
Answer:a
Explanation:
The difference between charging by conduction and charging by induction is
A. During induction, charges move between objects that briefly touch; during conduction, charges move between objects that are rubbed together.
What is conduction and induction?Conduction charges another body with a charged body by came in contact with that body.
Induction charges another body without came in contact with that body.
Thus, the correct option is A
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Balance N2 + H2 —NH3 what type of reaction
1. A dichotomous key helps us _____________ organisms. identify dissect 2. A dichotomous key us3. Typically, a dichotomous key moves from the _______ to the specific traits when helping us to identify organisms. general unknown
Answer:
Identify
Explanation:
I just did a USATestprep on it your welcome
Answer:
identify
Explanation:
A scientific theory never changes. ture or false ?
Answer:
False.
Explanation:
Scientific theories and hypothesis are all tentative. Science tries to prove something is either true of false and come up with answers (as much as we can) for many problems. Sometimes they are made based on limited data or information. Over the years, we come up with need findings discoveries which are able to give us more information and give us better answers. There have been a couple of scientific laws which had to be completely revised or discarded after new observations. An example of this would be the Laws of Thermodynamics. A couple of the laws have been changed over the decades after scientists made new disoveries and observations.
What are eggshells made of?
Answer:
Eggshell is made almost entirely of calcium carbonate
Explanation:
Rewrite this chemical reaction with the correct coefficients. Mg + Ag+ -> Mg2+ +
Ag*
Answer:
Mg + 2Ag⁺ ⟶ Mg²⁺ +2Ag
Explanation:
1. Start with the skeleton equation.
Mg + Ag⁺ ⟶ Mg²⁺ + Ag
2. Separate it into two half reactions
Mg ⟶ Mg²⁺
Ag⁺ ⟶ Ag
3. Balance charge by adding electrons to the deficient side
Mg ⟶ Mg²⁺ + 2e⁻
Ag⁺ + e⁻ ⟶ Ag
4. Multiply each half-reaction by numbers to equalize the electrons transferred
1×[Mg ⟶ Mg²⁺ + 2e⁻]
2×[Ag⁺ + e⁻ ⟶ Ag]
5. Add the two half-reactions, cancelling species that occur on each side
Mg ⟶ Mg²⁺ + 2e⁻
2Ag⁺ + 2e⁻ ⟶ 2Ag
Mg + 2Ag⁺ ⟶ Mg²⁺ +2Ag
The equation is now balanced.
1. If 400 grams of C2H6O2 is added to 4,000 g of water, calculate the molality?
Answer:
1)1.61molKg-1
Explanation:
we find the molality using the formula mole of solute/Kg of solvent..