Answer:
You can identify an unknown substance by measuring its density and comparing your result to a list of known densities. Density = mass/volume. . You divide the mass by the volume and compare the density to a list of known densities.
X has a fixed melting and boiling point while Y does not. Which of the following statements about X and Y is correct?
A: X is an element or a compound while Y is a mixture.
B: X is an element while Y is a compound or a mixture.
C: X is a mixture while Y is an element or a compound.
D: X is a compound while Y is an element or a mixture.
Answer:
A. X is an element or a compound while Y is a mixture
A pool holds 20,000 liters of water. How many milliliters is this?
Answer:
2000000
Explanation:
Answer:
20,000,000
Explanation:
When heating liquid materials in laboratory glassware, a student should always
Answer:
be careful to not hurt yourself
Answer: make sure the liquid is pointing away from the face
Explanation:
HELPP PLEASEEEEEEE ITS PROBS EASY FOR YOU GUYS
Answer:
ik that energy makes us movie and that it powers lights and electronics
kinetic energy ,chemical energy ,potential energy ,and thermal energy
the law of conservation of energy states that the total energy of an isolated system remains constant
Explanation:
hope it helpss
What is scientific consensus?
O a new scientific idea that was confirmed by the original researcher
an idea that has been changed due to new information
O a general agreement among scientists about a scientific idea
the understanding that knowledge in a particular area can be uncertain
Answer:
it's C
Explanation:
got it right on EDG 2021
The scientific consensus is a general agreement among scientists about a scientific idea. The correct option is C.
What is a scientific idea?A scientific idea is the explanation or facts of science. It reveals the truth about the world. How the world works and the secrets of nature. It tells and gathers true information about the world.
The different aspects of life and the world are understood and studied by scientists. Different scientists work for different forms of life. The scientist's ideas change over the different evidence.
The generalized ideas of various scientists give and agree upon the different theories of the levels of science. The publication process and specialized field.
Thus, the correct option is C. a general agreement among scientists about a scientific idea.
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Calculate the ratio of H+ ions to OH– ions at a pH = 6. Find the concentration of H+ ions to OH– ions listed in Table B of your Student Guide. Then divide the H+ concentration by the OH– concentration. Record this calculated ratio in Table A of your Student Guide.
Compare your approximated and calculated ratios of H+ ions to OH– ions at a pH = 6. Are they the same? Why or why not? Record your explanation in Table A.
What is the concentration of H+ ions at a pH = 6?
What is the concentration of OH– ions at a pH = 6?
What is the ratio of H+ ions to OH– ions at a pH = 6?
The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the pH of 1.0 x 10⁻³ M of solution is 7.002. pH is a unitless quantity. Therefore, the ratio between [H+] and [OH⁻] is 100:1.
What is pH?pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
pH =-log [H+]
Substituting the given values, in above equation, we get
6 =-log [H+]
[H+]= 0.000001
[H⁺]x[OH⁻] = 10⁻¹⁴
0.000001x[OH⁻] = 10⁻¹⁴
[OH⁻] =0.00000001
ratio= [H+]/[OH⁻]
= 0.000001/0.00000001
=100:1
Therefore, the ratio between [H+] and [OH⁻] is 100:1.
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Select the correct answer.
What is the SI unit of time?
second
OB.
minute
Ос.
hour
OD. day
What is the density of an object with a mass of 57.8g and a volume of 112.4mL?
Answer:
D=m/v
D=57.8/112.4
D=0.51423487544 g/mL^2
Explanation:
The density of an object with a mass of 57.8 g and volume of 112.4 mL is 514.23 mg/m L.
What do you mean by density?Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume.
Density is commonly expressed in units of grams per cubic centimeter.
Density can also be expressed as kilograms per cubic metre .
To calculate the density of an object ,
Given,
Mass=57.8 g(57.8×1000=57800mG) convert grams into milligrams
Volume=112.4mL
We know ,
Density =mass/volume
=514.23mG/mL
The density of an object with a mass of 57.8g and volume of 112.4 mL is 514.23 mg/m L.
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The atoms of compounds are _____________ combined in some way. Often times they come together to form groups of atoms called molecules.
Answer:
Chemically
Explanation:
Because chemical bonds form between the atoms.
You come across a thick deposit of shale that forms a layer in the ground. What can you infer about the area's past environment?
A. It was near a volcano, because shale forms when lava cools quickly and hardens.
B. It was covered by water, because shale forms when water deposits clay particles.
C. It was underground in a volcanic area, because shale forms when magma cools slowly and hardens.
D. It was covered by water, because shale forms when water evaporates and deposits the dissolved clay.
Which of the following is true about lava and magma? A Lava and magma are both types of molten rock. B Magma uses waves to break down lava over time. C When magma cools and hardens it becomes lava. D Magma is called lava when it’s below the Earth’s surface.
Answer:
a
Explanation:
magma is lava and lava is magma
A Lava and magma are both types of molten rock is true about lava and magma. Therefore, option A is correct.
What do you mean by molten rock ?Extrusive igneous rocks are formed when molten rock cools on Earth's surface. Rhyolite, pumice, and basalt are a few examples. Intrusive igneous rocks are formed when molten rock cools within Earth. Granite and gabbro are two examples.
Magma is an extremely hot liquid and semi-liquid rock found beneath the Earth's surface. The inner core, outer core, mantle, and crust make up Earth's layered structure. Magma makes up a large portion of the planet's mantle. This magma has the potential to push through holes or cracks in the crust, resulting in a volcanic eruption.
Scientists refer to molten rock underground as magma, and molten rock that breaks through the Earth's surface as lava.
Thus, option A is correct.
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What is a major difference between Animalia and Plantae kingdoms?
Answer:The plant kingdom consists of organisms which posess the ability to generate their own food through a process called photosynthesis. The animalia kingdom is not capable of this process so they are obligated to obtain food from others. Known to date there are about 250,000 known types of plants.
Answer:
Members of Kingdom Animalia are heterotrophic, whereas members of Kingdom Plantae are typically autotrophic.
Explanation:
Which statement is true? *
All solutions are mixtures.
All mixtures are solutions.
In a mixture, a substance must dissolve in another substance.
Please help
15 points
Answer:
if we were standing on the sidewalk Thane our perspective of the world would look like ( car moving right) (plane moving right as well) hope this helps comment for any further help
I need help and 25 points and brainliest
Answer:
green
Explanation:
6. How are the frequency and wavelength of light related?
O Wavelength is determined by dividing frequency by the speed of light.
O They are inversely proportional to each other.
O They are directly proportional to each other.
O Frequency equals wavelength divided by the speed of light.
Answer:
Option B is correct = They are inversely proportional to each other.
Explanation:
Frequency and wavelength of lights are inversely proportional to each other.
The wave of light having highest frequency have shortest wavelength and the light with the shortest frequency having highest wavelength.
Formula:
Speed of light = wavelength × frequency
c = λ × f
λ = c/f
This formula shows that both are inversely related to each other.
The speed of light is 3×10⁸ m/s
Frequency is taken in Hz.
It is the number of oscillations, wave of light make in one second.
Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.
Option A is incorrect:
Because wavelength is determine by dividing speed of light by frequency.
Option C is incorrect:
Because wavelength and frequency are not directly proportional to each other.
Option D is incorrect:
Because frequency is equal to the speed of light divided by wavelength.
Answer: it’s B or the second option
Explanation:
An atom has 11 protons, 12 neutrons, and 11 electrons. What is the identity of the element?
Answer:
It's a Sodium Atom
How many atoms are there in 14.3 g of xenon?
Answer:
6.56 × 10²² atoms Xe
Explanation:
Step 1: Find conversions
Molar Mass Xe - 131.29 g/mol
Avagadro's Number: 6.022 × 10²³
Step 2: Use Dimensional Analysis
[tex]14.3 \hspace{3} g \hspace{3} Xe(\frac{1 \hspace{3} mol \hspace{3} Xe}{131.29 \hspace{3} g \hspace{3} Xe} )(\frac{6.022(10)^{23} \hspace{3} atoms \hspace{3} Xe}{1 \hspace{3} mol \hspace{3} Xe} )[/tex] = 6.55911 × 10²² atoms Xe
Step 3: Simplify
We have 3 sig figs.
6.55911 × 10²² atoms Xe ≈ 6.56 × 10²² atoms Xe
compared to the sun , all of the stars that can be observed in the night sky are?
Answer:
small- even though they are huge suns themselves.
Explanation:
A mixture of iron and sulfur can be separated by attracting the Iron particles with a magnet. If the iron and sulfur mixture is heated strongly, iron (II) sulfide forms, which is no longer magnetic and cannot be separated by
physical methods. What is Iron (II) sulfide?
A heterogeneous mixture
B. compound
C. homogeneous mixture
D. element
Answer:B
Explanation: It is a compound
Iron (II) sulfide can not be separated by physical methods because it is a compound.
A compound is a combination of elements that are chemically combined. The components of a compound can not be separated by physical methods.
A compound is formed during a chemical change so it is not easy to reverse the process and obtain the constituent elements again.
Therefore, the components of Iron (II) sulfide can not easily be obtained again because a compound has been formed.
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Question 2 (1 point) Plate Movement Focus Seismic Waves The white box should be identified as... A: Focus. B: Earthquake. C: P wave. D: Epicenter
Answer:
Epicenter
Explanation:
Answer: Where does an earthquake’s motion occur first?
The earthquake's motion occurs first at epicenter.
Explanation:
The bond between iodine and fluorine in l-F would be a:
O
a
Ob
ес
james bond
nonpolar covalent bond
ionic bond
o d
polar covalent bond
Answer:
D.) polar covalent bond
what happen when chlorine gas is passed into concentrated solution of naoh
Answer: By Stoichiometry, 3 moles of chlorine gas reacts with 6 moles of sodium hydroxide solution to form 5 moles of sodium chloride, 1 mole of sodium chlorate (V) and 3 moles of water. Hence, the reaction between chlorine gas and hot, concentrated NaOH solution yields Sodium chloride and sodium chlorate(V).
Explanation: Hope it helps :)
Help!!!
Identify an element on the periodic table that is chemically similar to boron (B).
Answer:
Metalloid
Explanation:
A metalloid is a type of chemical element which has a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals. There is neither a standard definition of a metalloid nor complete agreement on the elements appropriately classified as such
A box has a mass of 5 kg. What is the weight of the box on Earth?
Show your work. (Hint: What is the pull of gravity on an object at Earth's surface?)
Answer:
Given that W=mg:
The weight of the box would be 50 N taking the value of 'g' as 10ms-2. Taking the value of 'g' as 9.8ms-2, the weight of the box would be 49 N.
(N = Newtons)
I will give Brainliest ...What mass of KBr is present in 75.0 mL of 0.250 M KBr solution?
Answer:
Mass of KBr present = 2.23 g
Explanation:
Number of moles of KBr present in 75.0 ml of 0.250 M solution of KBr is first determined
From the formula: molarity = number of moles/ volume (L);
Number of moles = molarity * volume (L)
Volume of solution in Litres = 75/1000 = 0.075
Number of mole = 0.250 * 0075 = 0.01875 moles
Mass = number of moles * molar mass
Molar mass of KBr = 119 g/mol
Mass = 0.01875 moles * 119 g/mol = 2.23 g
Which chemical can be toxic to the cells if it is not removed?
A.Oxygen
B.Glucose
C.Water
D.Carbon Dioxide
A tapeworm attaches to the wall of its host’s intestine and starts to absorb the host’s nutrients. Eventually this can cause great harm to the host as the host loses many important nutrients.
Which type of infectious agent is a tapeworm?
a virus
a bacterium
a fungus
a parasite
Answer:
A parasite.
Explanation:
A virus usually invades cells and replicates.
A bacteria usually just replicates and either is beneficial or can harm.
A fungus usually decomposes or can make you sick.
A parasite usually is parasitism - it invades the organisms and leeches off them for shelter and nutrients and can harm.
Answer:
A parasite.
Explanation:
i got it right
Where is the genetic material located in plant and animal cells?
A.in the lysosomes
B.in the nucleus
C.on the cell wall
D.inside the chloroplasts
HELP ASAP
Answer:
The genetic material of plant and animal cells is located in the nucleus (option B).
Explanation:
In living beings the nucleus of each cell contains the genetic information in a molecule called DNA. The DNA is formed by chains of nucleotides, whose order and sequence determine this information.
A DNA molecule forms a chromosome, and this contains genes, corresponding to segments or fractions of the DNA molecule that forms it. This information, contained in the nucleus, is necessary for the construction and functioning of each living being.
Lysosomes , cell wall and chloroplasts are other cellular structures that do not store genetic material.
Answer:
in the nucleus so b is the answer.
Explanation:
The Periodic Table is a
A)
a chart that contains compounds, elements, and mixtures
B)
a chart of elements that shows the density of each element
C)
a chart of compounds that shows their atomic structure
D)
a chart of elements showing the repeating pattern of their properties
Answer:
D
Explanation:
i took a test with this question
