Answer:
the reactivity of alkaline earth metals increases from top to the bottom of the group, that's because the atoms get bigger from the top to the bottom so the valence electrons are farther from the nucleus.
5. Calculate the mass in grams of 1.88 x 1024 particles of CO2?
Answer:
137.44g CO2
Explanation:
(1.88 × 10²⁴ / 6.02 × 10²³) × (16 + 16 + 12.01) = 137.44g
Which kingdom does spiny lobster, and diatom belong to?
Answer: The spiny lobster belongs to the kingdom ANIMALIA while diatoms belongs to the kingdom PROTISTA.
Explanation:
There are different ways biologists have used to examine and describe million kinds of living organisms. To classify organisms into groups, biologist look for important features that are shared by a large variety of organisms. These features which should have similar origin, structure and position. Organisms with certain important features in common are then put together into one group.
In the hierarchy of living organisms, the largest group of organisms is the KINGDOM. There are five types of kingdoms in which organisms are grouped, these includes:
--> kingdom Monera
--> kingdom PROTISTA,
--> kingdom fungi,
--> kingdom plantae and,
--> kingdom ANIMALIA.
Kingdom PROTISTA: they are single-celled, motile or non-motile organisms that are made up of eucaryotic cells, that is,cell structure is complex with a definite nucleus. Member include the DIATOMS, amoeba and chlamydomonas.
Kingdom ANIMALIA: They are multiple-celled, motile organisms that feed on other organisms. Their cells have no cell walls. The members include the SPINY LOBSTER, corals,worms, snails and cows
Look at the images of Mars below. choose three features from the images and explain why they provide evidence thatt there is or was water on Mars. NEED HELP ASAP. (Will mark Brainlist)
Answer:
Spot (4) Has evidence that there were waves here at some point. It looks as if the sand/surface debris was moved back and forth, creating this pattern in the sand. Spots (5) and (7) show evidence of water erosion. The smooth edges of both hills mean that water once flowed through that area, carrying little pebbles and rocks that gradually shaped and smoothed those mounds. An example for this would be how there are smooth areas in the Grand Canyon where scientists have concluded that some, if not all, of the Grand Canyon was formed by flowing water. "Rapid uplift, cracking, and surface drainage of receding floodwaters provide both the path and the necessary volume of water to quickly carve out Grand Canyon," says scholars on icr.org.
Explanation:
Water Erosion exists.
What are the [H+] and [OH-] for a substance with a pH of 9.2? Show work please
Explanation:
[H+]=10^-pH
[H+]=10^-9.2
[H+]=6.031x10^-10
[OH-]=1x10^-14÷[H+]
[OH-]=1x10^-14÷[6.031x10^-10]
[OH-]= 1.66x10^-5
im pretty sure this is right
How many grams of NaOH would be required to make 1.0 L of a 1.5 M solution
How do changes to genes in body cells differ from changes to genes in egg and sperm cells?
Answer:
These genetic changes are not present in a parent's egg or sperm cells, or in the fertilized egg, but happen a bit later when the embryo includes several cells. As all the cells divide during growth and development, cells that arise from the cell with the altered gene will have the mutation, while other cells will not.
Explanation:
How many grams of CO 2 are present in a container with a volume of 5.61 L if the gas exhibits a pressure of 5.66 atm at a temperature of 311 K?
Answer:
54.72 g
Explanation:
Mass = ?
Volume = 5.61 L
Pressure = 5.66 atm
Temperature = 311 K
The relationship between these equations is given by the ideal gas equation;
PV = nRT
where R = gas constant = 0.0821 atm L K-1 mol-1
n = PV / RT
n = 5.66 * 5.61 / (0.0821 * 311 )
n = 1.2436 mol
Number of moles = Mass / Molar mass
Mass = Number of moles * Molar mass = 1.2436 * 44 = 54.72 g
Why does nobody fking answer my questions.
How did stromatolites contribute oxygen to the early atmosphere?
through methane degradation
through photolysis
by weathering of rocks
through photosynthesis
Answer:
by wearing of rocks
Explanation:
earths gravity your welcome
Answer:
weathering of rocks is the answer to your question
How many molecules of CrCl₃ are produced when 2.89 moles of CuCl₂ react? *
2Cr+3CuCI2-2CrCI3+3Cu
Explanation:
The reaction is CaCO
3
+2HCl→CaCl
2
+H
2
O+CO
2
.
Thus, 2 moles of HCl reacts with one mole of calcium carbonate to produce one mole each of calcium chloride, water and carbon dioxide respectively.
Hence, 3 moles of HCl will react with excess of calcium carbonate to produce 3×
2
1
=1.5 mol of carbon dioxide
Most of Earth's atmosphere is made up of nitrogen gas. Nitrogen can also
exist as a solid, liquid, or plasma. Four samples of nitrogen are each in a
different state but have the same mass. Which statement about the relative
amounts of thermal energy in the samples is true?
Answer:
it should be B (i did this wrk before)
Explanation:
Which one of the following to all methods of heat transfer require?
a. A difference in thermal energy
b. A liquid or gaseous state
c. Direct physical contact
d. The movement of particles
Answer:
A
Explanation:
A difference in thermal energy
The study of chemicals is called chemistry.
The correct answer is A.
According to the law of thermodynamics, It states that heat transfers from the high temperature to the low temperature.
According to the question, heat transfer must require the temperature difference between the two systems and allow to flow from high temperature to low temperature.
Hence, the correct answer is A that is a difference in thermal energy
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When determining an Empirical formula
a)you must change everything to percentages
b)you must use Avogadro's number
c)you must convert grams to moles
d)you must balance the equation
What is the total number of orbitals that can be found on third electron shell (n=3)? Answer with explanation
Answer:
nine orbitals
Explanation:
There are nine orbitals in the n = 3 shell. There is one orbital in the 3s subshell and three orbitals in the 3p subshell. The n = 3 shell, however, also includes 3d orbitals.
1. All the individuals of one type of clownfish ( e. species) living in a reef compose which level of organization?
A B C D ............
Answer:
I think gamma, I'm not sure tho
A woman uses 330 Joules of energy to push a box across the floor in 33 seconds. What is her power output in Watts?
Answer:
10 watts
Explanation:
Power = Work / Time
Power = 330 J / 33 s
Power = 10 watts
Help! 7th grade science!
When her lab partner takes out a graduated cylinder to pour a specific amount of liquid, Jocelyn reminds her to be careful for the curve at the top of the liquid. This curve is also known as the
A
stopper.
B
meniscus.
C
beam.
D
Erlenmeyer.
The curve in the given scenario is known as the meniscus. The correct option is B.
What is a graduated cylinder?A graduated cylinder, also known as a measuring cylinder or mixing cylinder, is a piece of laboratory equipment that is commonly used to measure the volume of a liquid.
It is narrow and cylindrical in shape. The amount of liquid measured is represented by each marked line on the graduated cylinder.
A graduated cylinder is a piece of laboratory equipment used to measure the volume of liquids, chemicals, or solutions during the course of a day's work in the lab.
Graduated cylinders provide greater precision and accuracy than standard laboratory flasks and beakers.
The upward or downward curve seen at the top of a liquid in a container is known as the meniscus.
Thus, the correct option is B.
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30 points please help
Answer:
its D I'm pretty sure because it's from high heat/pressure
I need help with this please
Answer:
raising the Concentration of liquid
raise the temperature of the system
bubbles of hydrogen gas
What is the pH of 0.00765 KOH?
Does axons have insulation
Answer: Yes they do;
Explanation:
Axons, the long projections of neural cells that make up our peripheral nervous system's nerves, are comparable to power wires in that they have dense electrical insulation and can easily transmit impulses from the body and signals from the brain to a toe, for example.
The sound of a trumpet ECHOES off a nearby mountain. This is which type of wave interaction?
Answer:
reflection
Explanation:
wave reflection is when a sound bounces off something it cannot go through, like echoing
How many atoms of K are present in 195.49 grams of K?
Answer:
A- 3.0110 X 10^24
Explanation:
I took the quiz
The term mole concept is used here to determine the number of atoms of potassium. The number of atoms of potassium present in 195.49 grams is 3.011 × 10²⁴.
What is a mole?One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is given as:
Number of moles of atoms (n) = Given mass / Gram atomic mass
The given mass of potassium = 195.49 g
The atomic mass of 'K' = 39.098 g
n = 195.49 / 39.098 = 5 mol
Number of atoms = Number of moles of atoms × 6.022 × 10²³
5 mol × 6.022 × 10²³ = 3.011 × 10²⁴
Thus the number of atoms is 3.011 × 10²⁴ .
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Why does it seem that the sun is rising and setting in the sky?
Answer:
Because of the earths rotation
Explanation:
But it appears to rise and set because of the Earth's rotation on its axis. It makes one complete turn every 24 hours. ... As the Earth rotates toward the east, it looks like the sun is moving west. As the Earth rotates, different locations on Earth pass through the sun's light.
Answer:
When the earth is rotating, it is rotating away and towards the sun which is why we have day and night
Explanation:
What organelle is sac like and stores different materials?
Group of answer choices
endoplasmic reticulum
vacuoles
ribosomes
Golgi Body
Name the 6 kinetic factors
A single 250 gram
serving of one sports drink contains
0.055 grams of sodium ions. What is the
concentration of sodium ions expressed
as % by mass?
2.2 x 10-4
2.2 x 102
2.2 x 10-2
2.2 x 10-4
2.2 x 10^-2
0.055 / 250 = 0.00022 - This would be 2.2 x 10^-4, but the question is asking for percent, not proportion, so multiply by 100% to get the percentage.
0.00022 * 100% = 0.022% = 2.2 * 10^-2
Drag each item to show if it is matter or not matter.
light bulb added to
sunlight
heat
lamp
matter
light bulb
not matter
Which separation techniques will you apply for the separation of the following? a) oil from water b) kerosene and petrol c) salt from sea water d) camphor from salt ii). State the principle of chromatography.
Answer:
A) Separating funnel method
B) Simple Distillation
C) Evaporation
D) Sublimation
E) It is based on the principle of separation whereby even though two substances are dissolved in the same solvent, their respective solubilities could be different. Thus, the component that has more solubility will rise fastest and will therefore get separated from the mixture.
Explanation:
A)
B) Kerosene and petrol are both miscible liquids and the difference in their boiling point temperature is not more than 25°C. Thus, we make use of Simple distillation.
C) Can be separated by evaporation where the water is boiled and it evaporates and leaves the salt behind
D) To separate camphor from salt, we use sublimation so the camphor can change directly from solid to the gas state without passing through the liquid state.
E) Chromatography is used to separate components of a mixture.
It is based on the principle of separation whereby even though two substances are dissolved in the same solvent, their respective solubilities could be different. Thus, the component that has more solubility will rise fastest and will therefore get separated from the mixture.
7. Where do amino acids reside ?
Answer:
Explanation:
Polar side chains tend to be present on the surface of a protein where they can interact with the aqueous environment found in cells. On the other hand, non-polar amino acids tend to reside within the center of the protein where they can interact with similar non-polar neighbors.
