1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
anyanavicka [17]
2 years ago
7

Alice went camping with her family. She set up her tent in a grassy area. After two weeks, she noticed that the grass under her

tent turned brown. Which factor most likely explains why the grass turned brown?
lack of water and sunlight

lack of oxygen and fertilizer

lack of soil and shade

lack of food and nutrients
Chemistry
2 answers:
Drupady [299]2 years ago
4 0
The first one.
Lack of water and sunlight
julia-pushkina [17]2 years ago
3 0
Lack of water and sunlight
You might be interested in
Ethanol is added to gasoline because the oxygen it contains improves gasoline's burning efficiency. Its combustion reaction is g
Angelina_Jolie [31]

Answer:

A) Exothermic

B) (1) -410.5 kJ  (2) -98.1 kcal

C) -976.44 kJ

Explanation:

A) By the value of ΔH (-1236 kJ), we can see that it's negative, it means that the heat is being lost by the reaction, and, because of that, the reaction is exothermic.

B) The molar mass of ethanol is 46.07 g/mol, so, at 15.3 grams, the number of moles is:

n = mass/molar mass

n = 15.3/46.07

n = 0.3321 mol

By the equation

1 mol of ethanol           ----------------------- -1236 kJ

0.3321 mol of ethanol ----------------------- x

By a simple direct three rule:

x = -410.5 kJ

1 kJ --------------- 0.2390 kcal

-410 kJ ---------- y

y = -98.10 kcal

C) The molar mass of water is 18 g/mol, so the number of moles at 42.7 g is:

n = 42.7/18

n = 2.37 moles

By the equation

3 moles of water     ----------------------- -1236 kJ

2.37 moles of water --------------------- x

By a simple direct three rule:

3x = -2929.32

x = -976.44 kJ

5 0
3 years ago
The compound CaSO4 ionizes into a calcium ion and a sulfate ion (SO4). Calcium has two electrons in its outer shell. Upon ioniza
gtnhenbr [62]

Answer:

-2

Explanation:

Calcium is the element of second group and forth period. The electronic configuration of Calcium is - 2, 8, 8, 2 or 1s^22s^22p^63s^23p^64s^2

There are 2 valence electrons of Calcium.

Thus, calcium loses two electrons to sulfate ion and sulfate ion accepts these electrons to form ionic bond.

Calcium sulfate, CaSO_4 is formed when 2 valence electrons of calcium are loosed and they are gained by sulfate ion.

Ca^{2+}+SO_4^{2-}\rightarrow CaSO_4

Thus, the charge on the sulfate ion is -2.

6 0
3 years ago
Chemical formula for tin iv carbide
aniked [119]

Answer:

Explanation:

Sn(WC)2

if it is tungsten carbide this should be correct but there are many versions of carbide

Sn(MC2)2

could also be possible

the 2 next to MC should be a subscript

3 0
3 years ago
I need help with these two
bearhunter [10]

Answer:

6. d,  7. a

Explanation:

6. Molarity is a number of moles solute in 1 L solution.

7. 1 L solution - 2.5 mol K2CO3

 20 L             - x mol K2CO3

x  =20*2.5/1 = 50 mol K2CO3

Molar mass(KCO3) = M(K) + M(C) + 3M(O)= 39 +12 +3*16= 99 g/mol

99 g/mol *50 mol = 4950 g KCO3 Closest answer is A.

Actually KCO3 does not exist, in reality it should be K2CO3.

3 0
3 years ago
This substance consists of two or more different elements chemically combined
kow [346]
The substance would be referred to as a compound substance.
8 0
2 years ago
Other questions:
  • 1. Is this equation balanced? Explain your answer. Na + Cl2 → NaCl ?
    10·2 answers
  • What happens when magma cools either underground or on the surface and hardens?
    8·2 answers
  • What do all substances in the universe have in common?
    9·1 answer
  • 1. Know what elements make up water and in what proportions
    9·1 answer
  • The primary gas in a volcano is: water vapor carbon dioxide sulfur dioxide nitrogen
    5·2 answers
  • After scientists get the results of their experiments, they...
    5·1 answer
  • While hiking last year, Mike saw a large boulder next to a mountain trail. The boulder had no cracks. While hiking on the trail
    10·1 answer
  • I don’t get this- it’s due tmrw
    8·1 answer
  • A cheetah has been clocked at 112 km/hr. what is this speed in m/s?
    14·2 answers
  • Help me please this'll cost me half of my grade
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!