Answer: D. 4
Explanation:
For numbers with decimal point, we should start counting from the first number that non-zero from the left.
0.0001372
We start counting from 1, since it is the first non-zero number
1, 3, 7, 2
There are in total 4 significant figures
Hope this helps!! :)
Please let me know if you have any question or need further explanation
Which statement best explains why the overall charge on an atom is zero? The positive charge of the neutrons in the nucleus equals the negative charge in the electron cloud. The positive charge of the protons in the nucleus equals the negative charge in the electron cloud. The negative charge of the neutrons in the nucleus equals the positive charge in the electron cloud. The negative charge of the protons in the nucleus equals the positive charge in the electron cloud.
the positive charge of the neutrons in the nucleus equals the negative charge in the electron cloud
Answer:
B on egde
Explanation:
The marathon covers 26 miles, 285 yards. Express this distance in kilometers.
(1 km= 0.6214 miles, 1 inch = 2.54 centimeters)
Show calculation steps
Answer:
Conversion gives 42,107 km in total
Explanation:
A marathon covers 26 miles and 285 yards.
If 1 kilometer is 0.6214 miles, then how many kilometers are 26 miles, then:
1 km = 0.6214 miles
X = 26 miles
X = 41,841 km
Now if 1 yard is 36 inches, how many inches is 285 yards?
1 yard = 36 inches
285 yards = X
X = 10260 inches
If an inch is equal to 2.54 cm, how many centimeters are 10260 inches?
1 inch = 2.54 cm
10260 cm = X
X = 26060.4 cm
And 26060.4 cm is 0.260604 km
Finally, the sum of the distance would be:
41.841 km + 0.260604 km = 42.107 km
what is the difference between deep water and shallow water waves???
Answer:
The change from deep to shallow water waves occurs when the depth of the water , d , becomes less than one half of the wavelength of the wave, λ....A wave with a longer wavelength travels at higher speed . In contrast , shallow - water waves show no dispersion . Their speed is independent of their wavelength .
Hope this helps :)
In an ocean ecosystem,the difference between deep water and shallow water waves is that waves in water deep enough so that the bottom has no effect on them are termed deep-water waves, whereas waves most affected by the bottom are called shallow-water waves.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
https://brainly.com/question/1673533
#SPJ2
Justin B. Believes that the temperature lowering during the fall months is what causes the color of the leaves to change. He set up an experiment wherein he placed some plants in 80 degrees rooms and some in 60 degree rooms. He observed the color of the leaves for a total of 1 month. At the end of the month Justin observed that 3/4 of the plants in the 60 degree temperature had begun to change colors and only 1/4 of the plants in the 80 degree temperature began to change colors.
Answer:
This question is incomplete, the remaining part of the question is:
What is the control group, independent variable and dependent variable?
Control group: Plants placed in 80 degree rooms
Independent variable: Change in temperature
Dependent variable: Change in color of leaves
Explanation:
The independent variable in a scientific experiment is the variable that the experimenter controls or manipulates in order to bring about a change in the dependent variable. In this experiment, the variable manipulated by Justin B is the TEMPERATURE CHANGE.
On the other hand, a variable is said to be dependent if it is the variable that responds to a change made to the independent variable or rather it is the outcome. In this experiment, Justin B is trying to see the outcome on the color change in leaves when exposed to a low temperature, hence, COLOR CHANGE IN LEAVES is the dependent variable.
Control group of an experiment is the group that receives no experimental treatment. It is the group the experimenter considers normal and hence is comparing with his experimental group. In this experiment, Justin B believes the leaves change color in a low temperature, hence, he placed some plants in a lower temperature (60 degree) in order to compare them with when the plants are placed in a higher temperature (80 degree). As far as this experiment is concerned, the plants placed in 80 degrees temperature are believed by Justin B not to undergo color change, hence, they are the CONTROL GROUP while the group he placed in 60 degrees temperature are what he is interested in, making them the EXPERIMENTAL GROUP
Imagine that Ana has a block made of pure gold. If she cuts this block into two equal pieces, pick the statement that best describes the resulting pieces.
Answer:
The density of each piece is the same as that of the original block.
Explanation:
Options
The mass of each piece is the same as that of the original block.
The weight of each piece is the same as that of the original block.
The density of each piece is the same as that of the original block.
The volume of each piece is the same as that of the original block.
The correct answer would be that the density of each piece is the same as that of the original block.
The density is the ratio of the mass of a substance to the volume of the substance. This ratio is constant for all substances because the mass of any object varies proportionally with the volume of the object. The more the mass increases, the more the volume also increases, and vice-versa.
Answer:
The answer is, C. funnel
Explanation:
A neutral solution is neither acid nor base. True or False
Answer:
true
Explanation:
Major product of free radical of chlorination of propene
Answer:
For example, propene reacts with aqueous chlorine to form 1-chloro-2-propanol as the major product.
Help on this question.
Density= mass/volume
D=25/25
D= 1 g/cm^3
Which of the following are pure substances?
table salt, NaCl
water, H20
Oxygen, 02
elements
compounds
all of the above
NaCl, H2O and O2 are all pure substance since it cant be separated.
Dependent variable
Do people who live in a city walk more and weigh less than similar individuals in a suburb?
Identify the dependent variable:
Answer:
Distance walked
Weight
Explanation:
A dependent variable refers to a variable the valuation of which relies on the independent variables. The dependent variable is what has been assessed in a linear expression or tested in an experiment. As the researcher modifies the independent variable, it observes and records the influence on the dependent variable. As per the question, the independent variable is determined by whether someone lives in a city or a suburb and its effect is measured on dependable variables that are distance and weight.
When a high mass main sequence star runs out of both hydrogen and helium in its core, the core begins to fuse
Answer:
i guess it explodes
Explanation:
Answer:
carbon
Explanation:
You have at your disposal 3 1-pound bags of various pure salts that dissolve readily in water. You can add one of the bags to a 55 gallon barrel of water. Which bag should you use to lower the freezing point by the greatest amount? (1 lb. = 0.454 kg)
Answer:
This question appears incomplete
Explanation:
However, it should be noted that addition of soluble salts generally lowers the freezing point of water hence after the addition, water will no longer freeze at 0°C but lower.
Soluble salts tend to form more ions in water, it is these ions that are responsible for interfering with the hydrogen bonds hence lowering the freezing. Thus, (since each bag are of the same weight) the bag that contains the salt that ionizes more in water will lower the freezing point by the greatest amount.
NOTE: Different weight of the salts could lead to more ions been formed in the water by some salts as against the other.
The metric system is based on what number?
Answer:
10
Explanation:
The prefixes attached to metric units carry the same meaning for all base units. The metric system is based upon powers of ten, which is convenient because: A measurement in the metric system that is represented by a rational number remains a rational number after metric unit conversion.
why coal is burnt in the absense of oxygen
Answer:
Carbon dioxide and heat are generated when coal is burnt in the presence of oxygen. - Coal is mainly made out of carbon contents. - So, the combustion of the coal is actually the combustion of carbon. - During this combustion process, the carbon is chemically bonded with the atmospheric oxygen and forms carbon dioxide.
Explanation:
Charcoal is mostly carbon. When it burns, the carbon combines with oxygen from the air to form carbon dioxide and carbon monoxide gases. So, you have fewer oxygen molecules in the air, and instead carbon monoxide and carbon dioxide molecules.
The process of heating coal in the absence of air is called the destructive distillation of coal. Coal contains a number of elements such as carbon, hydrogen, oxygen, nitrogen and sulphur. When coal is heated in the absence of air, a number of products are obtained.
Water is dissolved into n-butanol (a polar liquid). Which is the second step at the molecular level as water dissolves into n-butanol?
Answer:
Formation of intermolecular hydrogen bonding between water molecules and molecules of n-butanol
Explanation:
Low molecular weight alcohols are miscible with water in all proportions. The reason for this is that, when a low molecular weight alcohol is dissolved in water, intermolecular hydrogen bonds are formed between the low molecular weight alcohol and water molecules.
Low molecular weight alcohols such as n-butanol contain the polar -OH group which interacts with water via hydrogen bonding.
Answer:
n-Butanol molecules surround water molecules.
Explanation: its correct on ed gen uity
what is the organic product formed when ethanoic acid reacts with ethanol?
Answer:
Ethyl ethanoate is formed
A wood block measures 3cm in length, 4cm in width, and 5cm in height. The block has a mass of 180 grams. What is the block's density?
Answer:
Finding volume:
V(wood)=l×b×h=3×4×5=60cm³
we have been given the mass of the wood as 180 grams and we know that"
Density = mass/ volume
substituting in the mass and volume
=> D=180/60=3g/cm³
Find out the volume and mole in 56 g nitrogen at STP
Molecular weight of N, is 28 g
Answer:
Moles = 2 molVolume = 44.8 dm³Explanation:
From the question
mass of Nitrogen = 56 g
Molecular weight = 28 g/mol
To find the number of miles we use the formula
[tex]n = \frac{m}{M} [/tex]
where
n is the number of miles
m is the mass
M is the molecular weight
So we have
[tex]n = \frac{56}{28} [/tex]
We have the answer as
2 molesTo find the volume we use the formula
V = n × V(dm³)
where
V is the volume
n is the number of miles
V(dm³) is the volume of 1 mole of a gas at STP which is 22.4 dm³
So the volume is
V = 2 × 22.4
We have the answer as
44.8 dm³Hope this helps you.
Which object forms when a supergiant explodes
-red giant
-black hole
-white dwarf
-neutron Star
WILL MARK BRAINLIEST
black hole
hope it helps
edit: neutron star
Answer:
Neutron Star
Explanation:
Explain the need of the term avarage atomic mass
Answer:
The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotopе). An element does not have an absolute atomic mass.
Hope this helps :)
WHAT IS THE CHEMICAL FORMULA FOR WATER
Answer:
are you a kid bruh xd
Explanation:
H2O
Answer:
[tex]\huge\boxed{H_{2}O}[/tex]
Explanation:
Water is made up of two elements => Hydrogen and Oxygen
There are two hydrogen and one oxygen
So,
The chemical formula for water is:
=> H₂O
What is the parent isotope when Cl-33 is formed during a beta decay?
Answer:
33/16 S
Explanation:
In beta decay, the atomic number of the daughter nucleus increases by one unit while the mass of the daughter nucleus remains the same as that of the parent nucleus.
Hence, if we know that a beta decay has occurred, then the parent nucleus must have the same mass as its daughter nucleus but have an atomic number that is less than that of the daughter nucleus by only one unit, hence the answer above.
which of the following is a physical property?
a. flammability
b. heat of combustion
c. solubility
d. toxicity
Answer:
C. Solubility
Explanation:
Solubility. A physical property does not change the chemical compostion. Solubility can be observed, unlike the others.
Answer: c. solubility
Explanation: hope this helps
How do Newton's laws of motion explain why it is important to keep the ice smooth on a hockey rink so that players
can pass a puck as quickly as possible?
A. Smooth ice reduces the inertia of the hockey puck.
B.Smooth ice increases the force used to accelerate the hockey puck.
C. Smooth ice reduces the unbalanced forces that would slow the hockey puck.
D. Smooth ice decreases the reaction force that the ice exerts on the hockey puck.
Answer:
How do Newton's laws of motion explain why it is important to keep the ice smooth on a hockey rink so that players can pass a puck as quickly as possible? Smooth ice reduces the unbalanced forces that would slow the hockey puck. A skydiver falls toward the ground at a constant velocity.
Explanation:
How might you measure the amount of energy in the world's largest rice cake?
Answer:
kindly check the explanation section.
Explanation:
The largest rice cake in the world was discovered in the year 2007 in South Korea with a weight of 8,113 lb. The amount of energy in the World's largest rice cake can be determined by using the formula below:
The energy in kJ =[ mass of water] x [specific heat capacity of water] x [change in temperature].
In order to determine experimentally in the laboratory and make use of the formula above. The first thing[STEP ONE] to do is to measure the mass of the rice cake and record it.
STEP TWO: measure a known amount of water in a boiling tube.
STEP THREE: Heat the rice cake until it catches fire with a Bunsen flame.
STEP FOUR: Use the rice cake that has already caught fire in step three above and use it to heat the water in step two until the fire burns out.
Repeat the process for three to four times and record your observations under the following headings;
[1]. Mass of cake, [2]. Temperature of water before burning, [3]. Temperature of water after burning and Temperature increase per gram of the rice cake.
What is the volume of a liquid with a density of 1.5 g/L and a mass
of 78 grams?
Answer:
d =
m
V
m = d×V
V =
m
d
DENSITY
Density is defined as mass per unit volume.
d =
m
V
Example:
A brick of salt measuring 10.0 cm x 10.0 cm x 2.00 cm has a mass of 433 g. What is its density?
Step 1: Calculate the volume
V = lwh = 10.0 cm × 10.0 cm × 2.00 cm = 200 cm³
Step 2: Calculate the density
d =
m
V
=
433
g
200
c
m
³
= 2.16 g/cm³
MASS
d =
m
V
We can rearrange this to get the expression for the mass.
m = d×V
Example:
If 500 mL of a liquid has a density of 1.11 g/mL, what is its mass?
m = d×V = 500 mL ×
1.11
g
1
m
L
= 555 g
VOLUME
d =
m
V
We can rearrange this to get the expression for the volume.
V =
m
d
Example:
What is the volume of a bar of gold that has a mass of 14.83 kg. The density of gold is 19.32 g/cm³.
Step 1: Convert kilograms to grams.
14.83 kg ×
1000
g
1
k
g
= 14 830 g
Step 2: Calculate the volume.
V =
m
d
= 14 830 g ×
1
c
m
³
19.32
g
= 767.6 cm³Explanation:
what are the fundamental particles of an atom
Protons, neutrons, and electrons are the fundamental subatomic particles.
Explain the brosted lowery Concept of Acid & Bases with the help of example? I will brainlist you for the correct answer.
Answer:
•A Brønsted-Lowry acid is any substance (molecule or ion) that can donate a hydrogen ion ( H+ ).
•A Brønsted-Lowry base is any species that can accept a hydrogen ion ( H+ ).
Explanation:
*example based on the picture*
Take the following reaction for example:
Hydrochloric acid ( HCl ) is the Brønsted-Lowry acid because it donates a hydrogen ion. Ammonia ( NH3 ) is the Brønsted-Lowry base because it accepts the hydrogen ion.
The Brønsted-Lowry theory also introduces the concept of conjugate acid-base pairs. A conjugate acid-base pair are two species that differ by a ( H+ ) ion.
Based on the reaction above, the ammonium ion( NH+4 ) is the conjugate acid of the base ammonia and the chloride ion ( Cl− ) is the conjugate base of hydrochloric acid.
Hope this helps !Part One: Calculate the molarity of Ba2+ in an aqueous solution that contains 1.7 g of Ba(OH)2 in 0.75 L of solution.
Answer in units of mol/L.
Part Two: What is the molarity of H3O+?
Answer in units of mol/L.
Explanation:
Ba(OH)2 ==> Ba2+ + 2OH-
1.7 g = 0.008172796 moles Ba(OH)_2
1:1 for Ba2+ = 0.008172796 moles / .15L = 0.054M
2:1 for OH- = 0.016345593 moles / .15L = 0.109M
Kw = [H+] x [OH-] = 10^{-14}
10^{-14} / 0.109 = 9.2×10^{-14} = [H+]
If you wanted to find a sample of Fermium, which has an atomic number of 100, where would you look?
Answer:
It is produced in nuclear reactors.
Explanation:
Fermium is a synthetic element and is not found naturally.