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3 years ago

Which phrase describes runoff?

Chemistry

2 answers:

WINSTONCH [101]3 years ago

4 0

Explanation:

water from rain and snow that travels to streams

Please help!

Oksana_A [137]3 years ago

3 0

Answer: 4 water from rain and snow that travels to streams im pretty sure!

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Find the density of an 8 gram rock if the water in a graduated cylinder rises from 25.0 mL to

Olin [163]

To measure the density of the stone placed in a graduated cylinder let us follow these steps bellow

Measure the volume of water poured into a graduated cylinder
Place the object in the water and remeasure the volume.
The difference between the two volume measurements is the volume of the object.
Divide the mass by the volume to calculate the density of the object.

<em>We know that the formula for density is given as </em>

Given data

Mass = 8gram

Initial Volume of water in cylinder = 25mL

Final Volume of water in cylinder = 29mL

Hence the volume of the rock = 29-25 = 4mL

Therefore the density of the rock = 8/4 = 2 g/mL

Learn more:

brainly.com/question/17336041

6 0

2 years ago

Alkaline earth metals do not react with oxygen. true or false

elena-s [515]

False. Alkaline earth metals react with oxygen.

3 0

3 years ago

Why does a higher concentration make a reaction faster?

myrzilka [38]

Option B is correct,
With increase in concentration the density of reactants increases and the system becomes more crowded, the greater the reactants will come in contact with each other and collisions occur. If collision is in proper orientation and has optimum energy then its fruitful and yields product. So, the greater the number of reactants, the greater will be the chances of collision and the greater will be the production of products per unit time and hence, greater is the rate of reaction.

6 0

3 years ago

Read 2 more answers

Elements in the same column of the periodic table have what in common?

Kipish [7]

Answer:

Elements in same column of periodic table have same properties.

Explanation:

The elements in the same group have same number of valance electrons thus have similar properties.

Consider the elements of group two i.e alkaline earth metals. All have two valance electrons and show similar properties.

Magnesium, barium, calcium etc.

All alkaline earth metals form salt with halogens.e.g,

Mg + Cl₂ → MgCl₂

Ba + Br₂ → BaBr₂

Mg + Br₂ → MgBr₂

Ca + Br₂ → CaBr₂

They react with oxygen and form oxides of respective metal.

2Mg + O₂ → 2MgO

2Ba + O₂ → 2BaO

2Ca + O₂ → 2CaO

these oxides form hydroxide when react with water,

MgO + H₂O → Mg(OH)₂

BaO + H₂O → Ba(OH)₂

CaO + H₂O → Ca(OH)₂

With nitrogen it produced nitride,

3Mg + N₂ → Mg₃N₂

3Ba + N₂ → Ba₃N₂

3Ca + N₂ → Ca₃N₂

With acid like HCl,

Mg + 2HCl → MgCl₂ + H₂

Ba + 2HCl → BaCl₂ + H₂

Ca + 2HCl → CaCl₂ + H₂

8 0

3 years ago

Describe the pattern of the lewis dot structure of the first 18 elements

posledela

Explanation: Lewis dot structures are the structures which represent the valence electrons of an atom. The dots in the structure are considered as the valence electrons.

First 18 elements of the periodic table are Hydrogen(H), Helium (He), Lithium (Li), Beryllium (Be), Boron (B), Carbon (C), Nitrogen (N), Oxygen (O), Fluorine (F), Neon(Ne), Sodium (Na), Magnesium (Mg), Aluminium (Al), Silicon (Si), Phosphorous (P), Sulfur (S), Chlorine (Cl) and Argon(Ar).

The valence electrons are the electrons which are present in the outermost shell of an atom. The electronic configuration of the elements are:

Hydrogen (H) = $1s^1$ ; Valence electrons = 1