Answer:
A change in the shape of a substance
Explanation:
Because when ths shape of a sunstance changes , its physical appearance changes .A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.
When 0.25 moles of NH3 are produced according to the reaction below, how many moles of H2 must have reacted?
N2 + 3 H2 --> 2 NH3
O 1.5 moles H2
O 0.38 moles H2
O 0.25 moles H2
O 0.17 moles H2
Answer:
Explanation:
by stoichiometry
nNH3/2=nH2/3
0.25/2=nH2/3
nH2=0.25×3/2
nH2=0.375 mol
so its 0.38 mol
Answer:
I have this quiz rn I will try 0.38 if it is right I’ll edit this and say that
Explanation:
Which chemical equation best represents the process of photosynthesis?
Answer:
6CO2 + 6H20 ----> C6H12O6 + 6O2
Explanation:
(Carbon Dioxide) + (Water) ------> (Glucose) + (Oxygen)
Answer:
A
Explanation:
CO2= carbon dioxide
H2O= water
C6H12O6=glucose
O2=oxygen
Which of the following is a physical change?
Sugar dissolving in water
Milk souring
Metal rusting
Paper burning in a fire
Answer:
sugar dissolving in water
Explanation:
at the end mixing 2 substances and not get a new substance is not a chemical change. the sugar is still sugar even when its in water.
- All the metals of group 1 react with water, liberating hydrogen gas and forming metal
hydroxides. Suppose you are provided with a piece of metal stored in a bottle labelled as
‘Rubidium’. Based on your knowledge of the periodic table explain why it is not safe to
dispose it in sink with water?
Answer:
since it is in grp 1, it will react with water like all other metals.
Answer:
Rubidium, as a Group 1 metal, will have a strong reaction with the water and form hydrogen. The reaction is so strong it might even be explosive, hence the danger of putting it in water.
Explanation:
Hope this helped!
What is the mass 5.00 x 1022 molecules of PbCI2
Answer:
ion know this one
Explanation:
What charges would an atom of Cesium and Radium form based on the octet rule
Answer:
1+
Explanation:
Hope this helped!
A proton has a charge that is opposite the charge of
As a car slows down, its kinetic energy increases.
True
False
Answer:
False.
Explanation:
Kinetic energy represents the energy the car has and is using right now. So, if the car was fast, then it would have a lot of kinetic energy. A slow car has a low amount of kinetic energy.
What separation method collects vapor
Answer:
evaporation and distilation
Explanation:
state two uses of graphite which depends on the above properties
DESCRIBE TROPICAL STORM; THUNDERSTORM; AND TORNADOES
PLEASE HELP ME THIS IS DUE AT 1:45 PM AND IT'S 1:22 OM PLEASEEEE helppp!!1
Answer:
a tropical strom is when theres a lot of rain and it almost developed into a hurricane and a thunderstorm is rain with lightning and thunder but not that bad like a tropical storm and a tornado is when there is a huge gust of win that is formed in a circle like shape and could cause damage to homes
Explanation:
what is inert pair effect
Answer:
The inert pair effect is the tendency of the two electrons in the outermost atomic s-orbital to remain unshared in compounds of post-transition metals. The term inert pair effect is often used in relation to the increasing stability of oxidation states that are two less than the group valency for the heavier elements of groups 13, 14, 15 and 16. .[1] The name suggests that the outermost s electrons are more tightly bound to the nucleus in these atoms, and therefore more difficult to ionize or share
A physical change can be distinguished from a chemical change because during a physical change- a. the properties of the substance may change, but no new substances are produced b. the properties of the substance change for only a short time but will return to their original state. c. an entirely new substance with new properties forms as a result of the change d. a new substance is produced, but the new substance has properties identical to the original substance
Answer:
C. an entirely new substance with new properties forms as a result of the change
Answer:
. an entirely new substance with new properties forms as a result of the change
Explanation:
The mass of an object is 32g and its density is 17g /mL. what is its volume
Explanation:
here,
Mass (m)= 32 g =0.32 kg
Density(d)= 17 g/ml
volume (v)=?
we know that,
d=m/v
17=0.32/v
v= 0.32/17
v=0.018
Answer:
[tex]\boxed {\boxed {\sf v \approx 1.88 \ mL}}[/tex]
Explanation:
The density formula is:
[tex]d=\frac{m}{v}[/tex]
If we rearrange the formula for volume, the result is:
[tex]v=\frac{m}{d}[/tex]
The mass of the object is 32 grams. The density is 17 grams per milliliter.
[tex]m= 32 \ g\\d= 17 \ g/mL[/tex]
Substitute the values into the formula.
[tex]v=\frac{32 \ g}{17 \ g/mL}[/tex]
Divide. Note that the grams, or g, will cancel each other out.
[tex]v=\frac{32 }{17 \ mL}[/tex]
[tex]v=1.88235294 \ mL[/tex]
Let's round to the nearest hundredth to make the answer more concise.
The 2 in the thousandth place tells us to leave the hundredth place as is.
[tex]v \approx 1.88 \ mL[/tex]
The volume of the object is about 1.88 milliliters.
Momentum is mass times
A. acceleration
B. velocity
C. distance
B. velocity
This is the answer
which process explains how rock that formed underground is now aboveground in sierra nevada
Answer:
formation process
Explanation:
farllon plate was fully subducted along pacific coast line
The cascade mountains formed from the igneous rocks by plate movement are younger and they are formed by the uplift of plates makes them appears aboveground in sierra Nevada.
What are cascade mountains in Sierra Nevada ?Since they were formed by melting above a subduction zone, the Cascades and Sierra Nevada's rocks are largely igneous. The Cascades, which initially arose 36 million years ago and are still forming now, are younger mountains.
In contrast, the Nevadan Orogeny, which occurred over 200 million years ago, is when the plutonic core of the Sierra Nevada started to form. When subducting at a sharp angle, oceanic lithosphere at the edge of the North American continent melted, and the magma surged back through the continental crust to form a volcanic arc.
The once-deep granite batholith that makes up today's Sierra Nevada was exposed by erosion after being raised by the North American plate. Although one small spur is located in Nevada, the elevated granitic intrusion is 640 kilometers long and largely located in California.
Find more on rocks in Sierra Nevada:
https://brainly.com/question/21856412
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A group hikes from sea level to a mountain peak. Each letter in the diagram indicates a spot where the group stops to drinks boiling water. At Wich point in the hike does water have the highest point.
Answer:
oh my god i have learnt about this
Explanation:
Answer:
Point A
Explanation:
I dont know why but it was right on the test.
What a higher or lower temperature make particles in a substance move faster
Answer/Explanation:
A higher temperature causes the molecules in a substance to move faster in a chemical change. This increased speed allows the particles to have enough force for a chemical change and it also increases the amount of times a particle hits another this makes it faster for it to combine.
How many protons does a nitrogen atom have?
07
0 14
8
05
Answer:
07.
Explanation:
Answer:
7
Explanation:
We call these different isotopes of nitrogen. There are always 7 protons because the nucleus is always a nitrogen nucleus (Z=7). Since different isotopes of an element have different numbers of neutrons (but always the same number of protons) they have different mass numbers.
Mendel's early studies led scientist to discover what in 1953?
RNA
DNA
GMO
Answer:
DNA
Explanation:
DNA
Mendel's early studies led scientist to discover what in 1953 is DNA
Answer:
DNA
Explanation:
luv you <3
What happens to the atoms of most non-metals when they react with other elements like metals?
Explanation:
Atoms of non-metal usually gain electrons when
they react with other elements.
Eg -
Na· + ·Cl → Na⁺Cl⁻Therefore,
Option A is correct ✔
What are the advantages of an electromagnet? PLEASE ANSWER!!
Answer:
The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field
When propane is reacted in the presence of oxygen gas, the products of this combustion reaction are: A. CO + H2O B. CO2 + H2O C. C2H4 + H2O D. CH4 + H2O
Answer:
B. CO2 + H2O
Explanation:
Propane is an hydrocarbon as it contains only v=carbon and hydrogen atoms.
Whenever an hydrocarbon reacts with oxygen or undergoes a combustion reaction, two products are always formed only,
These two products are;
Carbon dioxide (CO2) and water (H2O)
This means the correct option is option B.
Volume in liters of carbon dioxide produced at stp when 0.85 grams of butane reacts
Volume in liters of Carbon dioxide : 0.672
Further explanationReaction(combustion of butane-C₄H₁₀)
2C₄H₁₀+13O₂⇒8CO₂+10H₂O
mol butane (MW=58,12 g/mol) :
[tex]\tt \dfrac{0.85}{58,12}=0.015[/tex]
mol CO₂ : mol C₄H₁₀ = 8 : 4, so mol CO₂ :
[tex]\tt \dfrac{8}{4}\times 0.015=0.03[/tex]
At STP, 1 mol = 22.4 L, so volume CO₂ :
[tex]\tt 0.03\times 22.4~L=0.672~L[/tex]
What transition energy corresponds to an absorption line at 527 nm?
Answer:
E = 3.77×10⁻¹⁹ J
Explanation:
Given data:
Wavelength of absorption line = 527 nm (527×10⁻⁹m)
Energy of absorption line = ?
Solution:
Formula:
E = hc/λ
h = planck's constant = 6.63×10⁻³⁴ Js
c = speed of wave = 3×10⁸ m/s
by putting values,
E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s / 527×10⁻⁹m
E = 19.89×10⁻²⁶ Jm /527×10⁻⁹m
E = 0.0377×10⁻¹⁷ J
E = 3.77×10⁻¹⁹ J
Answer:
D
Explanation:
a p e x
5. Flash floods occur when water collects at a faster rate than the water can be absorbed into the surrounding soil. During a lab investigation, students test water absorption rates for four types of soil, including clay, gravel, loam, and sand. The results from one experiment are provided in the table below. Soil Type Water Absorption Rate for 1L of Water (s) Clay 210 Gravel 45 Loam 180 Sand 60 Based on the data provided, which soil type is most likely to experience a flash flood? help me !!!!!!!!
Answer:
clay
Explanation:
its more than the rest
Please help brainiest is award!
Given the balanced equation representing a reaction:
4Al(s) + 3O2(g) → 2Al2O3(s)
Which type of chemical reaction is represented by this equation?
Answer:
The equation is already balanced.
The type of chemical reaction is oxidation
Explanation:
Oxidation is the addition of oxygen to a substance
Answer:
This type of reaction is a synthesis reaction
Explanation:
Hurry Find the slope for the liner relation described in the table
Answer:
2.75
Explanation:
For every ride taken the money spent goes up by $2.75.
Click the picture please
Answer:
A chemical change can be indicated by a change in color, change in temperature (exothermic or endothermic), change in smell, formation of a precipitate, or the formation of gas bubbles.
Explanation:
this should work