Answer:
1n
Explanation:
Classify the following materials rock or mineral
Answer:
Common minerals include quartz, feldspar, mica, amphibole, olivine, and calcite. A rock is an aggregate of one or more minerals, or a body of undifferentiated mineral matter. Common rocks include granite, basalt, limestone, and sandstone.
50.0 g of NaNO3 are dissolved into enough water to make 250 mL of solution. What is the molarity of this solution?
Answer:
2.35 M
Explanation:
Molarity is mol/L of solution. We have to convert the g to mol and the mL to L. G to mol uses the molar mass of the compound. The molar mass of NaNO₃ is 85.00g/mol.
[tex]50.0gNaNO3*\frac{1molNaNO3}{85.00gNaNO3} = 0.588molNaNO3[/tex]
Then you have to convert mL to L.
[tex]250mL*\frac{1L}{1000mL} = 0.250L[/tex]
Now divide the mol by the L.
[tex]\frac{0.588mol NaNO3}{0.250L} = 2.352 M[/tex]
Round to the smallest number of significant figures = 2.35M
how are speed and velocity alike?
Answer:
The answer will be listed below.
Explanation:
Speed and velocity both represent a way to measure the change in position of an object relative to time. If the motion is in a straight lne, then the speed and velocity would be the same. When measuring speed and velocity, they are used in m/s.
Which of the following is the sun responsible for?
A-Earth’s magnetic field
B-Earth’s temperature
C-Earth’s atmosphere
D-Earth’s rotation
Answer:
Im pretty sure it is B. Earths temperature
Explanation:
Why is it more difficult to cause photons to be emitted from neon
Answer:
Neon is a noble gas
Explanation:
It is important to note that the excitation energy of even the lowest excited states of noble gases is greater than the ionization energy of many atoms of other elements.
This is because, the electrons in a noble gas are contained in a filled shell with greater stability than the the atoms of other elements.
Hence, it becomes difficult to excite the neon atom to a higher energy level.
Recall that photons are emitted when atoms of elements return to ground state after being excited to higher energy level.
Since it is difficult to excite neon, it is also difficult to cause photons to be emitted from neon.
Paul and Karen were studying physical and chemical properties of matter. They determined that the mass of a sample was 50 grams. Which sentence BEST states
how mass describes matter?
A. The mass of a substance is a way to measure the amount of matter it contains.
O B. Mass is a way to measure the force of gravity on a substance.
o
C. Mass is a chemical property of a substance.
D. The mass of a substance may change, based on its location.
Answer:
A
Explanation:
Mass is a measure of the amount of matter in an object.
The mass of a substance measures the amount of matter it contains. Therefore, option A is correct.
What is mass?Mass can be explained as an intrinsic property of an object. Mass can be described the amount of matter in a body. Different atoms or different particles with the same amount of matter possess nonetheless different masses.
Mass can be experimentally determined by the body's inertia, meaning the resistance to an acceleration of the body when a net force is applied. The mass evaluates the strength of the gravitational attraction to the bodies.
The S.I. base unit of measurement of mass can be represented by the kilogram (kg) but it is not the same as that of weight. Mass can be defined as generally measuring the weight utilizing a spring scale, rather than a balance scale and comparing it to already known masses.
A body on the Moon will weigh less than on Earth due to the lower gravity on the moon but still have equal mass. Paul and Karen determined that the mass of a sample was 50 g which is the amount of matter it contains.
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Some oxides are given below. (i)Na2O (ii)NO2 (iii) CO2 (iv) MgO a) Which are the basic oxides among these? b) What is the name of the aqueous solution of CO2 ?
Basic oxides ⇒ metal(usually alkali/alkaline earth) +O₂
L + O₂ ⇒ L₂O
L + O₂ ⇒ LO
Dissolve in water becomes = basic solution
L₂O+H₂O⇒ 2LOH
LO + H₂O⇒ L(OH)₂
So the basic oxides : Na₂O and MgO
Na₂O + H₂O⇒NaOH
MgO +H₂O⇒Mg(OH)₂
The aqueous solution of CO₂(dissolve in water)
CO₂ + +H₂O⇒ H₂CO₃(carbonic acid)
Which part of the atom is responsible for chemical bonding?
Answer:
valence electrons
Explanation:
The electrons of an atom, in particular valence electrons, are involved in chemical bonding
A new scam on the Internet involves people selling samples of sodium that they collected from a secret river in the mountains. Write a short statement to explain why this is a scam.
Answer:
Explanation:
The reason this is a scam is because they are selling sodium and to sell this product you must have a licence to do so. And secondly, you cant tell the reader that it is from a secret river and sell them a product that reacts when it touches water.
Sodium is a very highly reactive metal that does not occur in free state in nature.
Sodium is a group 1 element. It has a very negative electrode potential which implies that it is highly reactive. Being a highly reactive element, sodium can not occur in free state in nature. It always occurs in combined form as compounds.
Hence, it is impossible to pick up sodium from any secret river in the mountains. Sodium metal is highly reactive hence it has to be stored under paraffin oil. The whole set up is indeed a scam.
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Does a clock have internal organization.
Answer:
yes
Explanation:
__
19. SC.912.L.18.12
The picture below shows a group of water skate bugs "walking on the surface of a pond. When an
insect lands or falls into the water, the water molecules vibrate. The water skater uses the resulting
vibrations to find its prey. What property of water enables this bug to stay on the surface of the pond
and not sink?
a. Water's high specific heat enhances the vibrations causing the bugs to float.
b. An optimum pH of the pond water, keeps the water calm so that the bugs don't
sink.
C. The hydrogen atoms, in the water, bond to the bugs' legs keeping the bugs on the
surface.
d. Hydrogen bonds provide cohesion of the water molecules enabling the bugs to stay
afloat.
Answer: Hydrogen bonds provide cohesion of the water molecules enabling the bugs to stay
afloat.
Explanation: Hope it helps :)
Hydrogen bonds provide cohesion of the water molecules enabling the bugs to stay.
Water:
The Earth is made up of 75% water. river, lakes, sea are some of the sources of water. Hydrogen bonds between the water molecules help to bind the molecules together.
Water molecules has cohesive property, due to this cohesive property all the hydrogen molecules bugs can easily afloat on surface of water.
There are the two types of properties such as cohesion and adhesion. Cohesion allows insects to walk.
Option C is the correct answer.
Therefore, Hydrogen bonds provide cohesion of the water molecules enabling the bugs to stay.
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I NEED ASAP PLEASE!!
Answer: freezing and evaporation for sure
Explanation:
9. An atom's electron configuration is shown here. How many electrons are in
that atom?
1s22s22p63s4
8
14
4
22
Answer:
14 electrons are in that atom
Write the products of these double-replacement reaction. Then balance each equation. a) NaOH(aq) + Fe(NO3)3 (aq)---> Iron (III) hydroxide is a precipitate
Answer:
3NaOH (aq) + Fe(NO₃)₃ (aq) → Fe(OH)₃ (s) + 3NaNO₃ (aq)
Explanation:
Step 1: RxN
NaOH (aq) + Fe(NO₃)₃ (aq) → Fe(OH)₃ (s) + NaNO₃ (aq)
Step 2: Balance RxN
We need 3 OH's on both sides.
We also need 3 NO₃'s on both side.
This will make it so we also need 3 Na's on both side3NaOH (aq) + Fe(NO₃)₃ (aq) → Fe(OH)₃ (s) + 3NaNO₃ (aq)
Name two characteristics that a thing must have to be called matter.
Answer:
mass is one
Explanation:
Answer:
mass and volume are the correct answers
Why were Democritus's ideas not science?
Answer:
Im not sure because you might have spelled a word wrong.But i believe because of their certain treaditions,belifs,and ways.
Explanation:
Calculate the mass of 0.5 moles of Co2
And 5 moles of h20
Answer:
Mass of 0.5 moles CO2 is 22 and Mass of 5 moles of H2O is 90
Explanation:
Moles = [tex]\frac{GivenMass}{Molecular Mass}[/tex]
so value of moles is given 0.5 for co2 and 5 for h2o and the molecular mass of co2 is 44 and h2o is 18 so we put these values in
Mass = Moles x Molecular Mass
and we get the answer
1) How much heat is needed to
melt 5.40 grams of ice at its
melting point?
answer: heat needed=18,300
expanation
during energy transformations energy is never
Answer:
created or destroyed
Explanation:
5. Explain the difference between a molecular
element and a molecular compound.
Answer:
is that in a molecule of an element, all the atoms are the same. For example, in a molecule of water (a compound), there is one oxygen atom and two hydrogen atoms. But in a molecule of oxygen (an element), both of the atoms are oxygen.
Explanation:
Answer:
The only difference between a molecule of a compound and a molecule of an element is that in a molecule of an element all the atoms are the same.
Explanation: A molecule of an element all the atoms are the same.
A balloon has a volume of 6.25 L at 453 kPa. What would the volume of this balloon be at 325 kPa?
Answer:
4.48 L
Explanation:
P1/V1 = P2/V2
453/6.25 = 325/ x
453x = 6.25*325
x = (6.25*325)/453
x = 4.48 L
What is the IUPAC name for CH3-CH2-CH(OH)CH3?
Answer:
2 butanol or sec butanol
Which type of force caused the weight to drop (11) after the rope was cut?
Friction Force
Normal Force
Applied Force
Electrical Force
Gravitational Force
Magnetic Force
Answer:
gravitational force.
Which of the following is a main group element?
O Ce
O Co
O Cu
OCs
O none of the above
LOOK AT THE IMAGE ABOVE CAN SOMEONE PLEASE DO IT WITH FULL STEPS PLEASE I NEED IT TODAY PLEASE PLEASE I WILL MARK YOU BRAINLIST
answer:
IMAGE IS SUPER UNCLEAR SORRY LUV <3
explanation:
your phone must me from 2009 with that trash camera quality sweetie i suggest you get a new one... oh wait you can't you're broke :(
Write the products of these double-replacement reaction. Then balance each equation. Ba(NO3)2 (aq) + H3PO4 (aq) ---> Barium phosphate is a precipitate)
Answer:
Explanation:
Step 1: RxN
Ba(NO₃)₂ (aq) + H₃PO₄ (aq) → Ba₃(PO₄)₂ (s) + HNO₃ (aq)
Step 2: Balance RxN
We need 3 Ba's on both sides.
We need 2 PO₄'s on both sides.
3Ba(NO₃)₂ (aq) + 2H₃PO₄ (aq) → Ba₃(PO₄)₂ (s) + 6HNO₃ (aq)
Help pls also i will give brainliest!
A company purchased a large forest and cut the trees for lumber. Sunlight which had not reached the forest floor before was now very bright on the bare ground. Holly ferns began to grow rapidly because of increased access to light and moisture.
Which population of organisms would be in direct competition with the Holly ferns for the same resources?
A) Squirrels
B) Hawks
C) Spotted owls
D) Wildflowers
Answer:
It's D) Wildflowers
Hope it helps!!!
An amoeba is a one-celled organism. The cell theory states that which of the following characteristics of amoebas must be true?All amoebas have a regular, spherical shape.All amoebas move rapidly using a cilia.All amoebas have organelles called chloroplasts.All amoebas come from other amoebas.
Answer:
I believe the answer is all amoeba come from other amoeba
Make a list of characteristics that all waves have in common
Answer:
sound waves, light waves, radio waves, microwaves and others
Explanation:
these waves have the same fundamental properties of reflection ,refraction, diffraction and interference, and all waves have a wavelength, frequency, speed and amplitude
Give evidence to support or dispute: “In nature, the chance of finding one isotope of an element is the same for all elements.”
Answer:
False, isotopes have different occurrence percentages, so the changes are different.
Explanation:
Hello,
In this case, since it is false that the isotopes of all the elements can be found with the same chance (occurrence) we can consider the following facts:
1. Carbon atom has two major occurring isotopes: C-12 (98.93%) and C-13 (1.07%).
2. Bromine atom has two major occurring isotopes: Br-79 (50.69%) and Br-81 (49.31%).
3. Calcium has four major occurring isotopes: Ca-40 (96.941%), Ca-42 (0.647%), Ca-43 (0.135%) and Ca-44 (2.086%).
Which show us that the chances of finding any isotope differ among elements.
Regards.
The statement presented in the question above is false, as the percentage of occurrence of an isotope cannot be defined and adopted for all elements, as this varies.
We can arrive at this answer because:
Isotopes are chemical elements that have the same amount of protons.However, these elements have different mass numbers and neutrons from each other.Although there is a percentage of occurrence of isotopes in nature, this percentage varies among elements.Mainly because these elements compose different substances and some may have low occurrence percentages and others high percentages.An example of this can be seen in Calcium (Ca) isotopes, where the Ca-40 isotope has an occurrence percentage equal to 96.9%, while the Ca-42 isotope has an occurrence percentage equal to 0.64%.
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