I just need help plz!
_______ is the process of using a specific material to speed up a chemical reaction, leaving the material unchanged at the end of the reaction.
Answer:
Catalyse
Note that I'M NOT A SCIENCE TEACHER! I MIGHT BE INCORRECT, DOUBLE CHECK YOUR ANSWER!
Stay safe and Merry Christmas! :)
Answer:
Catalyse
Explanation:
Catalysis is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst.
Top answer is most likely true
Based on the organization and colors in the periodic table, which two elements do you think are most similar in terms of their properties magnesium (Mg) , barium (Ba) , and gold (Au) ? Explain .
Answer:
Magnesium and barium
Explanation:
They are both Alkaline earth metals. All the alkaline earth metals react with water to produce hydrogen gas and the metal hydroxide, although somewhat less vigorously than the alkali metals.
The organization and colors in the periodic table magnesium and barium are the two element with most of the similar properties because they both belongs to alkaline earth metals.
What are periodic table?
Periodic table are defined as an arrangement of all the elements known to man in accordance with their increasing atomic properties and recurring chemical properties. 118 elements are arranged in periodic table.
Alkaline earth metals are defined as any of the divalent strongly basic metal of group 2 of a periodic table comprising beryllium, magnesium, calcium, barium and radium.
Thus, the organization and colors in the periodic table magnesium and barium are the two element with most of the similar properties because they both belongs to alkaline earth metals.
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Which of the following is NOT one of the four pieces of evidence Wegener
used to validate his continental drift hypothesis?
Current global warming trends
O Apparent fit of the continents as a "puzzle"
O Past climate of the Earth seen in glaciers
O Correlation of fossils
Correlation of rocks and mountains
ASAP pleaseee and Thankyou
Please help!!! I don’t know
Answer:
4.06×10^23
Explanation:
1 mole has 6.023×10^23 molecules
0.675 moles have (6.023×10^23×0.675) molecules
how elements are arranged in the groups of periodic table
Answer:
Explanation:
The chemical elements are arranged in order of increasing atomic number. The horizontal rows are called periods and the vertical columns are called groups. Elements in the same group have similar chemical properties. This is because they have the same number of outer electrons and the same valency.
A consequence of burning fossil fuels is
warming.
2. Water is an example of a(n)
a. inorganic b. organic
compound.
d. none of these
c. carbon
it would be A ,inorganic Compound
ASAP please and Thankyou
which element will chemically combine with fluorine to form a salt?
a. carbon
b. lithium
c. neon
d. oxygen
who is good at chemistry?! HMU asap!!!
Which question can be used to identify a physical property of an element?
Does a magnet attract the element?
Does rust form when the element is exposed to oxygen?
Do bubbles form when the element is mixed with an acid?
Does the element burn when held over a Bunsen burner flame?
Answer:
Does a magnet attract the element?
Explanation:
This is because, the attraction of an element by a magnet is a purely physical property. It has to do with the orientation of the electrons in the element. It does not tell us of the composition of the element or how it reacts with other elements. Whereas, the other questions deal with the chemical properties of the element. That is, how it reacts with other elements or substances.
A student prepared this table to gather information about digestion. Digestion of Food Column A Column B Physical Changes Chemical Changes The results of which investigation would be entered in Column A of the table? A. How do mitochondria release the energy in food molecules? B. Which type of teeth are most important in crushing food? C. What chemicals in the stomach are most important in breaking down proteins? D How do substances released by the pancreas affect the rate of digestion?
Answer:
B. Which type of teeth are most important in crushing food?
Explanation:
According to the question physical changes ought to be entered into column A while chemical changes ought to be entered into column B.
The crushing of food is a physical change. It does not involve any chemical transformation of the food material.The other options involve some sort of chemical transformation taking place on the food material being digested.
why elements are arranged according to atomic number rather than atomic mass in the periodic table
Answer:
hope it helps...
Explanation:
Atomic Number as the Basis for the Periodic Law
Assuming there were errors in atomic masses, Mendeleev placed certain elements not in order of increasing atomic mass so that they could fit into the proper groups (similar elements have similar properties) of his periodic table.
Which statement best describes how deflating a soccer ball is evidence of matter?
a) The ball changes shape from round to flat.
b) The ball increases size and shape.
c) The mass of the ball has increased.
d) The temperature outside the ball has changed.
Answer:
The temperature outside the ball has changed
What does the formula ΔH − TΔS determine?
entropy
Le Châtelier’s principle
enthalpy
Gibbs free energy
A car travels 300 miles in 5 hours. How long does it take for the car to travel 82 miles?
Answer:
5 hours is 300 minutes so it goes 1 mile per minute. So 82 minutes = 1 hour and 22 minutes.
Explanation:
So if the car goes 1 mile every minute to reach 82 miles you have to
1 x 82 = 82 minutes converted into hourse = 1 hour and 22 minutes :)
Why are yeast cells used in making bread?
Answer:
Yeast is used for the leavening of bread. Yeast uses the sugars and oxygen in dough to produce more yeast cells and carbon dioxide gas. The carbon dioxide makes the dough rise which gives the bread a light and spongy texture. Yeast also works on the gluten network.
Explanation:
2KCI -> K + CI2
balanced or unbalanced pls help
Answer:
unbalanced I know you should know to
85miles/hours south is an example of? this is science btw
Answer:
I believe it's an example of velocity
Explanation:
This is because 85miles/hour south is giving both magnitude (85miles/hour) and direction (south)
Question 4 (2 points)
Photosynthesis takes place in the nucleus of cells. (2 points)
O True
O False
false
Explanation:photosynthesis takes place inside an organelle called a chloroplast. For plants, chloroplast-containing cells exist in the mesophyll.
PLEASE HELP.
how many grams of K2SO4 are in 1.18x10^24 atoms?
Answer:
Mass = 331.17 g
Explanation:
Given data:
Mass in gram = ?
Number of atoms of K₂SO₄ = 1.18 × 10²⁴ atoms
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
1.18 × 10²⁴ atoms × 1 mol / 6.022 × 10²³ atoms
0.19× 10¹ mol
1.9 mol
Mass of K₂SO₄:
Mass = number of moles × molar mass
Mass = 1.9 mol × 174.3 g/mol
Mass = 331.17 g
According to Kepler’s 3rd law of motion, which planet will have the shortest orbital period?
A). Jupiter
B). Mercury
C). Earth
D). Saturn
Answer:
B: Mercury
Explanation:
Yuh
What state (solid, liquid, gas) is mercury in at the boiling point of water, 100°C? Explain.
Mercury is in a liquid state
Mercury's melting point is somewhere around -34 Degrees Celcius. Thus it should be assumed it will be a liquid at this temperature. Not a gas however as mercury's boiling point is somewhere in the 600 Degree range
what is the name of the covalent compound N5Cl8
Answer:
Did you put that in right because i've never heard of a compound called that nor is there a compound called that on the internet
Explanation:
You must of put that in wrong
which graph above best represents the relationship between the volume and the pressure of a gas?
The graph (A) best represents the relationship between the volume and the pressure of a gas.
What is pressure?The force was applied perpendicular to an object's surface per unit area across which that force is spread is known as pressure. The relationship between pressure and volume can be understand with the aid of ideal gas law.
PV=nRT.
where, P is pressure, V is volume.
It can be seen that when temperature will kept constant then pressure will be inversely proportional to the volume. It can be shown as:
P ∝ 1/V.
Therefore, graph A represent relationship between pressure (P) and volume (V).
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What is the percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrichloric acid andb142 grams of calciym chloride is obtained
Answer:
375 grams
Explanation:
The percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained is 82.55%
What is percent yield?Percent yield is defined as the amount of product actually made compared with the maximum calculated yield. It is the ratio of actual yield to the theoretical yield.
Mass of calcium carbonate = 155 g
Mass of HCl = 250g
Mass of calcium chloride product = 142 g
Moles of calcium carbonate = 155 / 100 = 1.55 moles
Moles of HCl = 250 / 36.5 = 6.85 moles
Mass of calcium chloride = Moles x Molar mass
= 1.55 mole x 111 g/ mole
= 172 g /mole
Theoretical yield = 172 g
Actual yield = 142 g
Percent yield = Actual yield / Theoretical yield x 100
= 142 / 172 x 100
= 82.55 %
Thus, the percent yield if 155 grams of calcium carbonate is treated with 250 grams of hydrochloric acid and 142 grams of calcium chloride is obtained is 82.55%
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what type of friction is talking
Answer:
does friction talks ? friction is a oppossing force tho
What is the temperature range for ammonium nitrate crystals and a pouch of water?
Answer:
its cold
Explanation:
If the value of mass doubles but the volume stays the same, the value for density will be
Answer:
if the value of volume doubles but the mass stays the same, the value for density will be 1